比利时专利BE1024100B1 SEAMLESS TILED DISPLAY

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专利摘要:
A tile and a tiled display system are described, comprising at least two adjacent tiles, each with a display screen with display pixels that are image elements, wherein each pixel, for color displays, consists of a plurality of light emitting (e.g. LED) or light modulating (e.g. LCD elements (e.g., RGB - see Fig. 1), wherein each of the tiles comprises at least one first substrate of a first material and at least one first layer of a second material fixed to the first substrate, with the characterized in that the thickness of the at least one first layer is smaller than the thickness of the first substrate; the coefficient of thermal expansion of the first substrate is smaller than the coefficient of thermal expansion of the at least one first layer and the distance between the at least two tiles is smaller than the dimensions of a pixel on the display screen. The first substrates of neighboring tiles can be brought into mechanical contact with each other to reduce the seam between tiles to the smallest possible size.
公开号:BE1024100B1
申请号:E2015/5103
申请日:2015-02-25
公开日:2017-11-16
发明作者:Peter Hickl
申请人:Barco Nv.；Barco Control Rooms Gmbh；
IPC主号:

专利说明:

SEAMLESS TILED DISPLAYS
The present invention relates to tiled display, to display tiles, and to methods for their production and operation, including any software or controls necessary for controlling such displays.
Background FIG. 1 shows a schematic representation of an arrangement with see-through projection from the prior art by means of a projector P, in which a ff-fast lens F is located in front of the projection screen P. In this way a brightness can be achieved which is more uniform for a viewer V from a certain viewing angle.
The projection screen P is made of a plastic material, for example polymethyl methacrylate (PMMA), associated with a diffuser. The diffuser is obtained, for example, by sandblasting the output surface (surface that the viewer sees) of the projection screen or by mixing small particles (e.g. titanium dioxide) in a resin before polymerization.
In an arrangement with tiles for see-through projection there are several see-through projection modules, each with a screen P, next to each other comparable to a checkerboard and forming a larger projection screen, as can be seen in figure 2.
Figure 2 again shows schematically how the pixels are arranged on the projection screen P. The projection of an image displayed by a light valve unit (e.g. LCOS, LC or micro mirrors, also known as DMD) is complicated. Three subpixels, green, red and blue, are close to each other and together form a pixel of the displayed image. The pixels follow one another at an intermediate distance A. The dashed line represents the inner region of the projection screen P onto which light can be projected in the projection arrangement known from the prior art. From this representation it becomes clear that it is not necessary to construct the rear projection modules such that the pixels on the edges of the projection screens P abut one another, since thanks to the pixel structure of the displayed image it is sufficient as the realizable intermediate distance between two adjacent pixels neighboring projection screens are projected approximately corresponding to the spacing A of the pixels on the projection screen P. In the prior art, the spacing between two neighboring pixels projected on neighboring projection screens is largely determined by the distance between two neighboring projection screens P. distance between two neighboring projection screens P is often referred to as the seam. If the light valve consists of a DMD, there are not necessarily red, green and blue sub-pixels. In that case, each of the color components is projected sequentially and occupies the entire area of a pixel. Instead of being projected one after the other, the color components can be projected over each other simultaneously, with each color component of an image being formed by a DMD and the projector having 3 DMDs to form a color image.
The minimum distance between two adjacent projection screens is dependent on the clearance required to allow expansion of the projection screens P due to the temperature and humidity without the projection screens P becoming misaligned, bent or damaged.
The problem of thermal and humidity-related expansion and the relative movement of tiles relative to each other and their influence on the seams between the tiles is also well known in the art.
US 5,400,178 "Screen unit for viewing projection system with see-through projection, method for its production and component for assembling the screen unit" attempts to solve the problem of thermal expansion by using materials that have about the same coefficients of thermal expansion. Nevertheless, the difference in thermal expansion is still too large for seamless tiled displays where the width of the seams between the tiles must be equal to or smaller than the distance between two neighboring pixels on the same tile.
In US 5,185,677 "Projection screen assembly of the transmission type" a tensioning mechanism is used. The mechanism comprises force receiving blocks made of a material with a coefficient of thermal expansion that is substantially equal to that of the plates from which the screen tilts are made.
With tiled displays with more than one row of adjacent screens, however, the tensioning mechanism cannot be hidden from the viewer. The mechanism proposed in US 5,185,677 is therefore not suitable for assembling large, multi-row seamless tiled displays.
The effect of atmospheric conditions is important not only for multi-screen displays made up of basic units, but also for prior art multi-screen displays, where larger screens are formed by joining together smaller screens, e.g. glue.
The above-described basic units of the prior art are often provided with a frame around the screen, which frame keeps this screen flat, often also serves to attach the screen to the housing of the basic unit and the edges of the screen against damage protects. This frame prevents an image from being projected to the outer edge of the front of the base unit and increases the visual connection or seam between the base units. EP-0 650 295 and EP-0 523 427 describe basic units of this type and assembling a plurality of basic units of this type to form a multi-screen display. In WO 95/28664 a solution is described to make it possible to project images up to the edge of the front of the base unit, which consists of a special treatment of the outer edges of the screen and a special attachment of said screen to a support structure so that the light from the projector can reach the front edges of the screen unimpeded - which are also the front edges of the base unit. In principle it is possible to achieve a perfect connection between screens of basic units at a specific temperature. However, the edges of a base unit of this type are vulnerable during transport and the other drawbacks associated with an assembly of base units remain.
Another solution is to bond relatively small optical screens to larger screens. Glued larger screens of this kind cannot be manufactured at the location where the projection screen is to be installed, but can only be produced at the manufacturer's production facility, after which they must be transported in very sturdy and large packaging. To prevent damage and contamination of the screens during mounting to a supporting structure, the installation must be carried out as carefully as possible. Under the influence of the atmospheric conditions (ultraviolet radiation, repeated temperature variations, absorption of moisture, oxidation ...) the mechanical and optical properties of the glue will change and the seams will become more visible.
During gluing to create a glue joint, pressure is applied to the glue to form a thin continuous film between the layers, to press air out of the joint, to bring the surfaces into intimate contact with the glue and to to keep them in this position during curing of the glue.
This is the traditional adhesive strategy, because: a) The adhesive material itself is not very strong and it is not a good idea to apply the adhesive thickly. Instead, the glue should be applied as a very thin layer, the glue adhering very well to well-prepared surfaces. b) For this purpose the surfaces must be very flat, perfectly clean and must be clamped together as firmly as possible until the line dries.
The glue is pressed out (step 1) and the surfaces must also be held together under pressure (step 2).
Step 1 can be nasty during production and requires surfaces to be cleaned and step 2 makes production slower and therefore increases production time, thereby increasing production costs.
The applied pressure can break delicate substrates made of glass, for example. To reduce the weight of large tiled displays, it is important to reduce the thickness and weight of all parts.
Liquid glue is not suitable for the oblique / lateral glue surfaces. The thickness of the glue layer would not be uniform (which would affect the gap / seam between display tiles) and it is known that glue sometimes flows / seeps between layers (e.g., between a ffes-speed lens and a substrate located above it). Such glue can form stains and visual artifacts.
An advantage of limited heat-activated adhesives, such as heat-activated adhesive tapes, is that the heat activity (ie a combination of temperature and activation time) can be properly controlled, so that thermal damage to other components can be reduced or avoided while the excellent structural has adhesive properties. For example, limited heat-activated adhesives, such as heat-activated adhesive tapes as used in embodiments of the present invention, can be activated at temperatures up to 120 ° C with an activation time of less than 90 seconds. A longer activation time can be applied if the temperature is lower. The activation time is a lesser problem if the temperature is lowered to a typical polymer glass temperature, such as 70 ° C-80 ° C. Such very low temperature systems are less preferred. So that a reasonable range of activation temperature is 100 to 140 ° with an activation time of less than 30 seconds at 140 ° C and less than 90 seconds at 120 ° C activation time.
The screen panels are preferably optical panels, such as a Fresnel lens, a lenticular or a combination of the two, and have a perfectly straight edge. They may comprise a plurality of layers, at least one of which is attached to the mounting plates with the aid of connecting wires. In order to pull the screen panels together and to position them relative to each other, and to attach these screen panels to and to position them relative to the mounting plates, rigid connecting wires which are U-shaped and which are made are preferably used made of metal or plastic.
The seams between the screen panels that are pulled towards each other are minimal, with a size of less than half a millimeter. By pulling the panels together by means of connecting wires, it is ensured that the seams between the screens are always and remain minimal, despite production tolerances and under changing climate conditions, such as temperature and relative atmospheric humidity. Any differences in expansion / contraction between the screen panels on the one hand and the supporting structure of the projection screen on the other hand are compensated for by the fact that the fixing plates connecting the screen and the supporting structure to each other are deformable and / or have a movable connection to the supporting structure, and the fact that the connecting wires have limited deformability to keep the connection between the screen panels optimal. This allows the screen, within certain limits, to move in such a way relative to the support structure that the seams remain minimal. The sewing threads on the sewn pins disclosed in EP 1 012 666 BI “PROJECTION SCREEN FOR IMAGE-DISPLAY DEVICES THAT WERE NEXT TO EACH OTHER” OR OR ABOVE EACH OTHER ”are clearly visible. In addition, the installation is strenuous, projectors must be adjusted if the ambient conditions change and the dimensions of the wall are practically limited.
Summary of the invention.
It is an object of the present invention to provide an alternative tiled display, display tile or methods for the production and operation thereof, including any necessary software or controls for controlling such displays.
An advantage of some embodiments is that they reduce the possibility that a tile can move relative to the bearing structure, e.g. so that the seams are small or remain minimal.
An advantage of embodiments of the present invention is that they offer at least two or three or all of the following advantages for a connection between a support and a substrate: a) Shear strength of the connections b) Shear creep of the connections c) Dimensions of the adhesive area d) Arrangement of glued surfaces, eg obliquely e) Choice of glue, eg a limited heat-activated adhesive f) Pressure reduction during production and thus reduction of the chance of fracture of the thin vulnerable substrates, increase of the production yield and reduction of the total weight, g) Weight reduction also leads to the reduction of loads on the connection between the frame and a substrate.
It is an object of the present invention to provide a mechanical design for cooperating and joining surfaces between a support and a substrate that does not make a shadow problem worse and at the same time makes the surface for attachment large and resistant to creep and shear forces in the long term, to provide a design that allows small and accurate seams to be placed between tiles to improve appearance, reduce pressures exerted during production, reduce the weight of parts, improve yield when using thin, breakable substrates.
An advantage of some embodiments is that they allow the assembly of large, seamless tiled displays with multiple rows.
An advantage of some embodiments is that the effect of thermal and humidity-related expansion and the relative movement of tiles relative to each other on the seams between tiles can be reduced. This makes it possible to use thin, breakable substrates and reduces the weight of the parts.
An advantage of some embodiments is that installation efforts can be reduced. An advantage of some embodiments is that the projectors need less adjustment if the environmental conditions change.
According to an aspect of the present invention, there is provided a tiled display system comprising at least two adjacent tiles, each associated with or provided with a display screen with display pixels that are picture elements, wherein each pixel, in color displays, consists of a plurality of luminous (e.g. LED) or light modulating (e.g. LCD) elements (e.g. RGB - see Fig. 1), wherein each of the tiles has at least one first substrate of a first material and at least one first layer of an on the first substrate attached second material, characterized in that the thickness of the at least one first layer is smaller than the thickness of the first substrate; the coefficient of thermal expansion of the first substrate is smaller than the coefficient of thermal expansion of the at least one first layer and the distance between the at least two tiles is smaller than the dimensions of a pixel on the display screen.
Embodiments of the present invention are not limited to projection-based video walls. They can also be used for seamless tile surfaces of display displays, such as liquid crystal displays or OLED displays. Standard displays usually have a considerable seam of several millimeters, which leads to ugly slits in a corresponding video wall.
According to another aspect of the present invention, the first substrates of neighboring tiles can be brought into mechanical contact with each other to minimize the seam between tiles. If the distance between two neighboring tiles is less than a distance “A” between two neighboring pixels on a tile T, the resulting tiled display is considered seamless.
According to another aspect of the present invention, the coefficient of thermal expansion of the substrate of the at least two tiles is less than or equal to 9.5 10 -6 1 / ° K. between 273 ° K and 373 ° K. This makes it possible to minimize the seams over a larger temperature interval.
According to another aspect of the invention, the first layer of second material comprises a Fresnel lens. The first layer of second material is, for example, modified, e.g., by engraving to form the Fresnel Lens. This is particularly relevant for tiled display systems with rear projection.
The first layer of second material can be formed in the Fresnel lens. The resulting Fresnel Lens can then be fixed to the first substrate, e.g., glued or laminated. Another possibility is to form the Fresnel Lens after the first layer is fixed to the first substrate, e.g. glued or laminated.
Another possibility is to apply the first layer of second material to the first substrate as a resin before it is formed into a Fresnel lens and optionally to cure it to the first substrate.
According to another aspect of the invention, the first substrate that supports the Fresnel lens is associated with another substrate that supports a different functional layer. According to that aspect of the invention, each display tile has a second substrate and a second layer attached to the second substrate. The second substrate can be made of the same material as the first substrate or can be made of a third material. The second layer will generally be made of a fourth material that is different from the first or third materials.
The second layer is fixed to the second substrate, e.g., usually glued or laminated, or applied to the second substrate before it is cured.
According to another aspect of the invention, the Fresnel lens is engraved directly into the first substrate.
In accordance with embodiments of the present invention, the first and second substrates of each tile can be attached to each other, e.g., by using a limited heat-activated adhesive. A pressure-sensitive structural adhesive tape is less preferred, since the use of pressure can damage thin, breakable substrates, such as glass. Glass is a heavy material and making it thinner would be an advantage, since it reduces the costs and weight of the display tiles. A limited heat-activated adhesive is one in which the flow of adhesive is limited, i.e. limited within certain limits.
A limited heat-activated adhesive may be, for example, a temperature-activated adhesive tape or a temperature-activated adhesive that is applied to a thin carrier film.
An advantage of a limited heat-activated adhesive, such as heat-activated adhesive tapes, is that the heat activity (ie a combination of temperature and activation time) can be properly controlled, so that thermal damage to other components can be reduced or prevented while they still have excellent structural adhesive properties. For example, limited heat-activated adhesives, such as heat-activated adhesive tapes as used in embodiments of the present invention, can be activated at temperatures up to 120 ° C with an activation time of less than 90 seconds. A longer activation time can be applied if the temperature is lower. The activation time becomes a smaller problem if the temperature is reduced to a typical polymer glass temperature, such as 70 ° C-80 ° C. Such very low temperature systems are less preferred. So that a reasonable range of activation temperature is 100 to 140 ° with an activation time of less than 30 seconds at 140 ° C and less than 90 seconds at 120 ° C activation time.
Embodiments of the present invention have one or more of the following advantages: a) have a larger joint surface by chamfering the surfaces, i.e. so that they are at an angle to the optical axis of the display tile; b) and at the same time allow connection surfaces to run closely parallel, and c) use a limited temperature-activated adhesive, e.g. in hand form, which does not migrate or flow and at the same time forms a strong connection, and d) furthermore limit the shadow on the edge to a low value and advantageously as small as possible by means of the inclined or inclined edge of the substrate, and e) the connection of the frame has an inclined or inclined connecting surface on both sides that is opposite on one side to the inclination on the other side of the display tile such that there is no fault line or shear surface parallel to the optical axis of the display and / or in a vertical direction if the display is installed; f) the pressure exerted on substrates during production, which allows the use of thinner, fragile substrates such as glass, thereby reducing the weight and increasing the yield, which leads to lower costs and also the load on the compound between the frame and a substrate.
Embodiments of the present invention have a larger adhesive area, with an opposite direction of the slope of the slant on opposite edges (lateral sides) of the tile, which means that the connections between the substrate and the support do not have shear surfaces parallel to the optical axis of the display tile or transversely of the optical axis in at least one direction and preferably in two orthogonal directions, so that the substrate cannot shift vertically over a shear plane. The slope of the slope at the edge (lateral side) of the carrier provides a better optical design at the edges.
Accordingly, according to an aspect of the invention, according to embodiments of the present invention, at least one of the first and second substrates is attached to a support frame, e.g., by a limited heat-activated adhesive. For the reasons indicated above, a pressure-sensitive structural adhesive tape is less preferred, being the risk of breaking breakable substrates resulting in the use of thicker and heavier plates. A limited heat-activated adhesive is an adhesive in which the flow of the adhesive is limited. A limited heat-activated adhesive may be a temperature-activated adhesive tape or a temperature-activated adhesive applied to a thin carrier film. The surface for attaching at least one of the first and second substrates to the support frame is a connecting surface that extends from an edge of a tile display inwards to the center of the tile at an acute angle with the optical axis of the display tile. The optical axis is assumed to run transversely to the largest surface of the substrate or tile. Opposite edges (lateral sides) of a tile have surfaces for attaching at least one of the first and second substrates to the support frame, with each connecting surface extending from an edge of a tile display inwards toward the center of the tile at an acute angle with the optical axis of the display tile. The edges (lateral sides) of the substrate are slanted. If the display has four sides and each edge (lateral side) is chamfered inwards, the substrate is in the form of a truncated base of a pyramid. This results in two opposing (diametrically opposed) joining surfaces on the edges (opposing lateral sides) of the display tile substrate that slope inward at opposite angles, so that a shear line parallel to the optical axis is not formed. Preferably, the tile has two oblique connection surfaces on the upper and lower edges of the substrate, if the display tile is installed, which slope is inclined inwards with opposite angles so that a shear line transversely of the optical axis in the vertical direction when the display is installed is not formed.
By applying a limited heat-activated adhesive such as a heat-activated tape, the thickness is controlled (because, unlike liquid glue, there is no production problem due to too little or too much glue and the related judgment of the operator), which is important to control the dimensions of the gap between tiles and the boundary of the adhesive means that no glue “seeps” during production or afterwards. In accordance with embodiments of the present invention, a larger surface area is provided with glue, e.g. to provide a stable support for display tiles with a diagonal of 1.5 m and several kilograms of weight per tile, each having 10 or more for substrates with a thickness of 1 to 3 mm. In embodiments of the present invention, the glue is preferably provided along the sloping edges (lateral sides) of a display tile with a carrier with a larger surface and experiences lower shear forces. After installation, the weight of the tile is applied perpendicular to at least 2 edges, instead of almost exclusively laterally. The use of a bonding method that does not use high pressure reduces the risk of damage to breakable substrates, such as glass, thereby reducing the overall weight and log team load on joints.
Alternatively, the limited heat-activated adhesive, such as a heat-activated adhesive tape, can be used to attach the substrate to a mechanical attachment element. In particular, the same limited heat-activated adhesive, such as the adhesive tape, can be used to attach two substrates to each other as well as to attach the substrates to the mechanical attachment element.
According to another aspect of the invention, the first substrate acts as a carrier and supports a liquid crystal imaging device.
The present invention also provides a tile for a tiled display arrangement, wherein the tile has a display screen with pixel locations and is arranged such that the distance between two adjacent tiles is smaller than the dimensions of a pixel location on the display screen, comprising: at least one first substrate of a first material and at least one first layer of a second material fixed to the first substrate, characterized in that the thickness of the at least one first layer is smaller than the thickness of the first substrate; the coefficient of thermal expansion of the first substrate is smaller than the coefficient of thermal expansion of the at least one first layer.
The present invention also provides a method for manufacturing a tiled display arrangement with at least two adjacent tiles, wherein each tile has a display screen with pixel locations, each of the two adjacent tiles comprising at least one first substrate of a first material wherein the method comprises: fixing at least one first layer of a second material on the first substrate, characterized in that the thickness of the at least one first layer is smaller than the thickness of the first substrate; the coefficient of thermal expansion of the first substrate is smaller than the coefficient of thermal expansion of the at least one first layer and the distance between the at least two tiles is smaller than the size of a pixel location on the display screen.
Brief description of the figures.
Figure 1. Schematic representation of a rear projection system.
Figure 2. Schematic representation of pixels on a tiled display.
Figure 3. Section through a display tile according to an embodiment of the invention.
4a. Example of chamfering of the carrier substrate according to an embodiment of the invention.
4b. Example of chamfering of the carrier substrate according to an embodiment of the invention.
Figure 5. Section through a tile and fixing mechanism according to an embodiment of the invention.
Figure 6. An exploded view of a tile and the frame to which it is attached according to an embodiment of the invention.
Figure 7. Attachment of the two carrier substrates to the frame by means of adhesive tape according to an embodiment of the invention.
Figure 8. Detail of chamfer of the carrier substrates and propagation of outer light rays through substrates according to an embodiment of the invention.
Figure 9. Detail of chamfer of the carrier substrates and propagation of outer light rays through substrates according to an embodiment of the invention.
Figure 10. Schematic representation of a tile in a screen display according to an embodiment of the invention,
Figure 11. Schematic representation of a tiled screen display according to an embodiment of the invention.
Figure 12. Schematic section through a tile and the play between substrate and mechanical fastening elements and frame according to an embodiment of the invention.
Detailed description of embodiments.
The present invention will be described with the aid of specific embodiments and with reference to certain drawings, but the invention is not limited thereby, but only by the claims. The described drawings are only schematic and are not limitative. For illustrative purposes, the dimensions of some elements in the drawings may be exaggerated and not shown to scale. Where the term "comprising" is used in the present description and claims, this does not exclude other elements or steps. Where an indefinite or definite article is used when referring to a noun in the singular, for example "a" or "de," the ", this also includes the plural of this noun, unless specifically stated otherwise. comprising ", as used in the claims, is not to be construed as being limited to the means listed below; it does not exclude other elements or steps.
Furthermore, the terms first, second, third and the like in the description and in the claims are used to distinguish between comparable elements and not necessarily to indicate a numerical or chronological order. It is to be understood that the terms used in this way are interchangeable under suitable conditions and that the embodiments of the invention described herein may operate in different sequences from those described or shown herein.
In addition, the terms upper (th), lower (th), horizontal, vertical and the like in the description and the claims are commonly used to describe a carpet lying horizontally unless a different meaning is given to it.
In the drawings, identical reference characters indicate similar features, and if a reference number occurs in more than one figure, it refers to the same element.
The invention relates to a display tile T and a tiled display, such as e.g. a tiled display for see-through projection or a tiled liquid crystal display.
The invention relates to a design of a display tile T that retains its shape and flatness, has only a small or negligible thermal expansion regardless of the environment (high humidity, temperature fluctuations ...), and remains aligned with respect to neighboring display tiles in a tiled display. For this purpose a stable transparent carrier substrate 1 is used, such as, for example, glass. Advantageous features are stiffness and robustness, light transmittance, low costs, electrical insulator, availability in various sizes and thicknesses. Glass can have these characteristics. The glass is, for example, sodium lime glass. Other types of glass are possible. The coefficient of thermal expansion of the material used for the carrier substrate is advantageously lower than 9.5-10'6 ° K ''. The substrate 1 has a first side, first largest surface or entrance surface that is substantially flat. The entrance surface is the surface or side of the substrate 1 through which the light or background lighting projected by the projector enters. The substrate 1 has a second side, second largest surface or exit surface that is substantially flat. The exit surface is the surface or side of the substrate 1 through which the light exits. The first side and second side of the substrate 1 are substantially parallel. If a line or surface, in particular a surface, is mentioned transverse to the substrate 1, this means that the line or surface is transverse to the first and second sides of the substrate 1.
A Fresnel Lens 2 is provided on the substrate 1. For example, the Fresnel Lens 2 can be engraved directly on the substrate 1. Alternatively, the Fresnel Lens is realized in a thin polymer layer 3 that is fixed to, e.g., laminated or glued, on the substrate 1, as seen in Figure 3. The fresnel lens can be formed, for example, by direct formation in a curable resin layer on which a mold is pressed. The resin can be applied to the substrate 1 for the use of a mold. The resin can be applied to a support intermediate surface that is different from the substrate 1, can be subtracted after applying a mold and can be laminated or glued to the substrate 1. The resin can be a soft resin such as silicone resin or a rubber or elastomer, or it can be a hard resin such as acrylic resin. The choice of hard or soft materials depends on the application and the dimensions of the tile T. Table 1 (see below) gives an overview of the advantages of using a hard acrylic resin instead of a soft silicone resin.
The polymer layer 3 is preferably thinner than the "carrier" substrate 1. If the polymer layer 3 is, for example, 0.3 mm thick, the carrier substrate 1 may have a thickness of 1 mm, 2 mm or more. The ratio of the thickness of the support substrate and the associated polymer layer 3 is advantageously 1.8 or more, for example 2.5, 3 or 5. Since the polymer layer and the substrate generally have a different coefficient of thermal expansion, it decreases or this inequality in thickness prevents excessive warping or bending of the substrate over time as the temperature varies. Since the substrate 1 is a stable material that is essentially unaffected by humidity, exposure to oxygen, and temperature fluctuations, a display tile according to embodiments of the present invention and used in a tiled display may be in mechanical contact with neighboring display tiles. An advantage is that the alignment of the tiles over time is not endangered by varying circumstances in connection with temperature, humidity and aging of the material of the substrate exposed to UV radiation and / or oxygen.
The greatest precision with regard to the lateral dimensions of the carrier substrate 1 and the polymer layer 3 is achieved by initially overdimensioning both the carrier substrate 1 and the polymer layer 3. The polymer layer 3 is applied to an intermediate support layer with a thickness of, for example, 0.3 mm or more, formed into a thin milling lens 2 and subtracted. At this stage, the lateral dimensions of the Fresnel Lens 2 are over-dimensioned more than, for example, 1 mm and generally up to 20 mm. For example, if the dimensions of a tile T are to be 1550 mm x 872 mm, the over-dimensioned tile T and fresnel lens 2 will be at least 1570 mm x 892 mm. The over-dimensioned Fresnel Lens 2 is laminated or glued onto the over-dimensioned carrier substrate 1. Once combined, the over-dimensioned carrier substrate 1 and the Fresnel Lens 2 are cut to their final dimensions, e.g. by means of a water jet. The inventor has come to the conclusion that a water jet is the cutting technique with which the greatest precision can be achieved without compromising the carrier substrate or the Fresnel lens. The same technique is applied mutatis mutandis if the Fresnel Lens is formed directly on the (oversized) support substrate. Alternatively, the Fresnel Lens Layer and the carrier substrate can be cut to size separately before being assembled.
Table 2 (see below) shows a summary of the problem that the various cutting methods tested by the inventor have.
An anti-reflection structure 4 can be provided, e.g., engraved, on the surface of substrate 1 that is directed to a projector in the tiled display with see-through projection of Figure 1. In alternative embodiments, the anti-reflection structure can be engraved on the surface of the substrate which is is directed to the viewer or to both surfaces of the substrate.
The geometry and dimensions of a display tile according to the invention reduce or prevent a change in the alignment of such tiles in a tiled display. Therefore, the distance between two adjacent tiles can be minimized without the risk of tiles loading each other due to thermal expansion. In particular, the distance between adjacent tiles in a tiled display screen with see-through projection can be smaller than the dimensions of a pixel on the tiled display screen with see-through projection, e.g. 1 mm or less and preferably less than 0.5 mm.
In a tiled display screen with see-through projection according to embodiments of this invention, the distance between adjacent tiles can be reduced to an extremely small value or even to zero, i.e. adjacent tiles are in mechanical contact with each other. This means that the carrier substrates of neighboring tiles can touch each other directly. In particular, the tiled display can be designed such that the carrier substrates of neighboring tiles will be in mechanical contact at the maximum temperature at which the display will be operated. If the temperature at which the display is operating is lower than the maximum temperature, neighboring tiles may cease to be in contact with each other and the distance between two tiles may increase, but will always have a low value, e.g. smaller than would otherwise be possible. A scattering layer and / or a contrast-enhancing layer can also be provided, in particular for a display with see-through projection. A second substrate 5 that is similar or the same as the first substrate 1 can be used to support a second layer 6 with the necessary scattering and contrast enhancing properties. The layer 6 can be applied to the first side or to the second side of the substrate 5. The layer 6 is usually supplemented by an anti-reflection structure. The anti-reflection structure is usually applied to layer 6, e.g. as an additional film layer 6b applied on top of layer 6. Layer 6 and layer 6a are usually polymerized on an intermediate substrate and subtracted.
The greatest precision with regard to the lateral dimensions of the support substrate 5 and the polymer layers 6 and 6b is achieved by initially over-dimensioning both the support substrate 5 and the polymer layers 6 and 6b. The polymer layers 6 and 6b are applied sequentially and polymerized on a support intermediate layer to a thickness of e.g. 0.3 mm or more and subtracted. At this stage, the lateral dimensions of the polymer layers are over-dimensioned more than, for example, 1 mm and usually up to 20 mm. For example, if the dimensions of a tile T are to be 1550 mm x 872 mm, the over-sized support substrate 5 and the polymer layers 6 and 6b will be at least 1570 mm x 892 mm.
The over-dimensioned layers 6 and 6b can be fixed to each other, such as laminated or glued (on top of each other), to the over-dimensioned carrier substrate 5. After the over-dimensioned carrier substrate 5 and the layers 6 and 6b are joined together, they are cut to their final dimensions, e.g. by means of a water jet. The inventor has come to the conclusion that a water jet forms a very good cutting technique that has a combination of very important features, such as the ability to achieve the desired precision for a composite layer 6 and 6b without compromising the carrier substrate or the composite layer 6 and 6b. The same technique can be applied mutatis mutandis if the Fresnel lens is formed directly on the (over-dimensioned) carrier substrate.
The cross-section of the substrates 1 and 5 can be in at least one direction (for example for 1D tile work, ie tile work in a row, as in Figure 4a) or in two perpendicular directions (for 2D tile work, ie for tile work in several rows of more then one tile, as in figure 4b, or in other words if the displaytiles are arranged in a checkerboard pattern) are trapezoidal or hexagonal.
Profiling the carrier substrate 1 and / or 5 is preferably performed with a machining technique, such as grinding, to achieve the required accuracy.
In figure 4a the cross-section is taken in plane Π ·
In Figure 4b, the cross-sections are taken on planes f1 and Fh, both planes being perpendicular to the substrate 1.
Chamfering the edges, such as chamfering the edges (lateral sides) of two or four (ie all) edges of substrate 1 according to embodiments of the present invention, such as e.g. shown in Figure 4a or b, and / or Figure 5 and / or Figure 7 and / or as shown in Figure 8 and / or in Figure 9 and / or in Figure 12 may lead to more complex cross-sections. In some embodiments, other substrates may be chamfered at two or more edges (lateral sides), as shown for substrate 5 in Figure 9 and Figure 1, as well as a matching slope or skew for mechanical attachment element, as shown in Figure 5 and / or Figure 7. and / or in Figure 8 and / or in Figure 9 and / or in Figure 12.
The cross-section of the carrier substrates plays an important role in fixing the substrates, as will now be discussed.
A surface 7 of a mechanical fastening element 8 corresponds in slope to a part of or to one of the lateral sides 9 of the substrate 1. For this purpose, lateral side 9 of the substrate 1 is beveled such that the connecting surface makes an acute angle with the optical axis of the display tile. The optical axis is assumed to be perpendicular to the largest surface of substrate 1. This is the case, except close to the edges (lateral sides), but this is not a determining factor for the main optical axis. The in FIG. 4a, 4b, 5, 7, 8, 9 and 12 is located between a vertical and a downward sloping line that runs to the inner part of the display tile. For example, in Figure 9 the sharpness is defined between the surface on which tape rests with the vertical. This surface slopes downward in the opposite direction of the optical exit direction which is upward in these drawings. The same situation occurs in FIG. 4a, 4b, 5, 7, 8 and 12.
At least one surface 7b of another mechanical fastening element that is identical to element 8 corresponds to a lateral side 10 of the substrate opposite to side 9, as shown in Figure 5. For this purpose, this lateral side 9 of the substrate 1 is chamfered that the connecting surface makes an acute angle with the optical axis of the display tile, but the angles on opposite lateral sides are opposite, so that the connecting surfaces of the edge of the tile run inwards and downwards, as shown in the drawings. If this is done at all edges of a tile, for example at each of four edges, this has the result that no shear surface is formed along which the mechanical fastening element 8 can crawl over time. The substrate 1 is attached to the mechanical fastening elements by means of, for example, glue on surfaces 7 and 7b. Sides 9 and 10 are formed by chamfering substrate 1. Liquid glue is less preferred. Most preferred is a limited heat-activated adhesive, such as a heat-activated adhesive film 13, which is advantageously used to attach the substrate 1 to the mechanical fastening element 8 instead of (liquid) glue, for the reasons indicated above. The second substrate 5 can be glued to the truncated top side of the quick-release layers, as shown in Figure 5.
Figure 6 shows a perspective view of a tile according to an embodiment of the present invention. Figure 6 shows that the mechanical fastening elements 8 are placed around the circumference of the substrate 1. The frame elements are mechanically attached to a frame F (by means of, for example, nuts 11 and bolts 12). The frame F is used to attach the tile T to a support structure that aligns and supports identical tiles forming a tiled display. The attachment to the carrier structure takes place, for example, by means of mechanical fastening elements A, B, C and D. The carrier structure preferably has position-adjusting means to adjust the position of each tile in the plane of the tiled display (e.g. the plane determined by the tiles of the tile display). The position adjusting means can, for example, enable translation of individual tiles in two perpendicular directions. The mechanical fastening elements A, B, C and D of a tile T are attached to the position-adjusting means associated with the tile. To merge the tiles into a tiled display, a first tile T1 is positioned. A second tile T2 is placed next to T1 and its position within the plane of tiles T1 and T2 is adjusted so that the tile is aligned by means of the position setting means of T2. A third tile T3 is arranged next to T1 (T2 and T3 are on opposite sides of T1) and the position in the plane of the tiles is adjusted by means of the position adjusting means of T3. A fourth tile T4 is placed above T1 and its position within the plane of the tiles is set, etc ... Figure 13 shows an example of a tiled display in 2X4 arrangement.
In its simplest form, the position adjustment mechanism consists of a nut and bolt system with the bolt passing through an opening that is larger than the diameter of the bolt. The tile's movements are limited to the maximum deviation of the bolt in the opening. When the tile is positioned, the screws and bolts are tightened and pressure is applied to the washers, one washer on each side of the opening. The washers move together with the bolt when the tile is moved. A tile includes four sets consisting of a nut, bolt, washer and the corresponding openings in the support structure to adjust its position.
To be able to reliably assemble substrates 1 and 5, the fresnel element must usually be truncated. Two substrates are attached, for example, by gluing the underside of substrate 5 on the top of the truncated Fresnel element to the periphery of the Fresnel lens layer. It is advantageous to attach the two carrier substrates with an adhesive film 13 so that they overlap the sides of both substrates 1 and 5. This is shown in Figure 7. In an alternative embodiment, the layer 6 is located between the Fresnel Lens 3 and the second carrier substrate 5, as in Figure 3b.
An example of a limited heat-activated adhesive is an adhesive film 13 as described in German utility model DE202009015262U1 "Latent reactive, heat-reactivable Klebmasse und damit hergestellte Klebemittel". Heat activation can take place by, for example, heating via near infrared or warm air (such as from a heat gun).
An advantage of limited heat-activated adhesives, such as heat-activated adhesive tapes, is that the heat activity (ie the combination of temperature and activation time) can be properly controlled, so that thermal damage to other components can be reduced or prevented and at the same time the excellent structural adhesive properties are retained. For example, limited heat-activated adhesives, such as heat-activated adhesive tapes as used in embodiments of the present invention, can be activated at temperatures up to 120 ° C with an activation time of less than 90 seconds. A longer activation time can be applied if the temperature is lower. The activation time is a lesser problem if the temperature is reduced to a typical polymer glass temperature, such as 70 ° C-80 ° C. Such very low temperature systems are less preferred. So that a reasonable range of activation temperature is 100 to 140 ° with an activation time of less than 30 seconds at 140 ° C and less than 90 seconds at 120 ° C activation time.
Because limited heat-activated adhesives, such as heat-activated adhesive films, are not liquid such as glue, it is easier to control the thickness of the adhesive film 13 which will contribute to the seam between adjacent tiles. As can be seen from Figures 7, 8 and 9, good thickness control is required and it is provided by embodiments of the present invention to control the seam between adjacent tiles.
Bounded heat-activated adhesives, such as heat-activated adhesive films, are also easy to apply and have a considerably smaller or no risk of glue penetrating between layers or in the grooves of the Fresnel lens. This is very important because the penetration of glue would cause visual artifacts. In an alternative embodiment, both substrates 1 and 5 are preferably chamfered at all edges and attached to the frame elements 8 and 8b, as shown in Figure 8. For this purpose, lateral sides of at least some or all of both substrates 1 and 5 beveled with corresponding inclined surfaces of frame elements 8 and 8b in such a way that the connecting surface makes an acute angle with the optical axis of the display tile, but the angles on opposite sides are opposite, so that the connecting surfaces are away from the edge of the extend tile inwards and downwards, as indicated in the drawings. If this is done at all edges of a tile, e.g. at each of four edges, the effect of this is that no shear surface is formed over which the mechanical fastening element can creep over time. In addition, good control of the thickness of the adhesive layer 13 ensures better control of the distance between two adjacent tiles. Figure 7, Figure 8, Figure 9 and Figure 12 show an alternative technique for attaching the two carrier substrates 1 and 5 and the mechanical fastening elements 8 with limited heat-activated adhesives, such as heat-activated adhesive films 13. In figures 7 and 8, the substrate 1 is chamfered, but not completely over the entire thickness. In Figure 9, substrates 1 and 5 are chamfered over their thicknesses. However, optical element 2, 3 may not be chamfered. As shown in Figure 12, substrate 1 is completely chamfered and substrate 5 is not completely chamfered at the edges. In addition, the use of limited heat-activated adhesives reduces pressure during production, which leads to the use of thinner breakable substrates and lower weight with higher yields.
The concept described above is not limited to projection-based video walls. It can also be used to provide seamless tiling on screen displays, such as liquid crystal displays or OLED displays. These displays have a considerable seam of several millimeters, which causes large gaps in a corresponding video wall.
In any of the embodiments of the present invention, the Fresnel Lens can be replaced with other light-conducting and image-enhancing functionalities. Some of the necessary functionalities can also be attached to the front of it. The functionality of the glass font element for light distribution, contrast enhancement and seamless tiling is used in a similar way. For example, it is possible to build a screen display wall with a very small seam, under 0.5 mm. That is one order of improvement compared to the current solution where the seam is ~ 5.5 mm.
Figure 10 shows how a single carrier substrate and associated functional layer can be applied in a seamless tiled display with liquid crystals (LC = Liquid Crystal). An LC panel attached to a mount is associated with a tile T. The mount can be up to, for example, 0.5 cm. The light from the LC panel falls perpendicular to a diverging Fresnel lens 15, the effect of which is to enlarge the image formed on the LC panel. The image is formed on a tile T according to the invention: a support substrate supports a diffusion layer with or without an anti-reflection layer.
The image formed on the LC panel is enlarged to fill the tile T.
Figure 11 shows the outer projected light rays on a section of two adjacent tiles T and their associated LC panel in a tiled display according to the invention.
In addition to a scattering Fresnel Lens 15 that magnifies the image formed on the LC Panel 14, a Fresnel Lens 16 is used as background lighting to illuminate the LC Panel 14. Any kind of highly collimated background lighting is good for good sharpness and improved contrast.
The enlarged image is distributed by the diffusion layer 6 supported by a carrier substrate 5. Within the entire temperature range within which the tiled display is operated, the distance between the two adjacent carrier substrates is smaller than the distance A between two neighboring pixels projected on the same tile T ( as shown in Figure 2).
An additional fresnel lens 17 can be applied directly in front of the diffusion layer 6 and its carrier substrate 5 to collimate the light for a more uniform image. The cross-section of a carrier substrate and mechanical fastening elements is such that there is no obstacle in the path of the outer projected light rays to the diffusion layer 6. The simplest cross-section for the carrier substrate 5 is trapezoidal, as can be seen in Figure 12. The edges of the image formed on the LC panel are projected along the edges of the diffusion layer 6.
Since the distance between two neighboring tiles is smaller than the distance A between two neighboring pixels on a tile T, the resulting tiled display is considered seamless.
To allow contact between two adjacent carriers at the maximum operating temperature, it is important that there is some free space Δ1 and Δ2 between the outer lateral sides S1 and edges E1 of the carrier substrate 5 and the outer surface element 52 of the mechanical fastening elements 8 and have the outer surface elements 53 of the frame F.
Mechanical tolerances and thermal expansion are taken into account when determining the value of Δ1 and Δ2 to minimize the seam between adjacent carrier substrates.
Table 1.
Table 2.

权利要求:
Claims (52)
[1]
Amended conclusions
A tiled display or transparent tiled display arrangement of tiles, each tile comprising a display screen and pixel locations, comprising: at least two neighboring tiles, each of the two neighboring tiles having at least one first substrate of a first material and at least one one first layer of a second material attached to the first substrate, characterized in that the thickness of the at least one first layer is smaller than the thickness of the first substrate; the coefficient of thermal expansion of the first substrate is smaller than the coefficient of thermal expansion of the at least one first layer, the at least one first substrate being fixed to a support frame, the geometry and dimensions of each tile being selected to to keep the distance between the at least two tiles smaller than 0.5 mm on the display screen and to reduce the possibility that a tile can move relative to the structure, the at least one substrate has slanting on lateral sides thereof which has first inclined Hjm surfaces and the support frame has second inclined adhesive surfaces that match the first inclined adhesive surfaces and the first and second inclined adhesive surfaces are fixed to each other with a limited temperature-activated adhesive, such as a temperature-activated adhesive tape, or glued to one another with a thin carrier film applied glue, and wherein the carrier frame v each tile is attached to a support structure, each tile being attached to the support structure by mechanical fastening means such that sliding and creeping within the adhesive tape or glue is reduced.
[2]
Tiled display arrangement according to claim 1, wherein an angle of inclination of the first inclined surfaces makes an acute angle with an optical axis of the tile perpendicular to the tiles.
[3]
The Tiled display arrangement according to claim 2, wherein the angles of inclination of the inclined surfaces of opposite lateral sides are inclined at different angles, so that there is no shear surface between the carrier and the at least one substrate parallel to the optical axis or orthogonal thereto .
[4]
Tiled display arrangement according to any of claims 1 to 3, wherein the first substrates of neighboring tiles can be brought into mechanical contact with each other.
[5]
5. Tiled display setup. according to any of claims 1 to 4, wherein the coefficient of thermal expansion of the first substrate of the at least two tiles is lower than or equal to 9.5 10'6 1 / ° K between 273 ° K and 373 ° K.
[6]
The tiled display arrangement of an earlier claim, wherein the first layer of second material comprises a Fresnel lens.
[7]
The Tiled display arrangement of claim 6, wherein the first layer of the second material is engraved to form the Fresnel lens.
[8]
The tiled display arrangement of claim 6, wherein the first layer of second material is formed into a Fresnel lens.
[9]
The Tiled display arrangement according to any of claims 6 to 8, wherein the Fresnel lens is glued or laminated to the first substrate.
[10]
The Tiled display arrangement according to any of claims 6 to 9, further comprising a second substrate that supports a second layer.
[11]
A tiled display arrangement according to claim 10, wherein the second layer is fixed to the second substrate.
[12]
The Tiled display arrangement of claim 10 or 11, wherein the second substrate is made of a third material that is the same material as the first substrate.
[13]
The tiled display arrangement of claim 12, wherein the second layer fixed to the second substrate is made of a fourth material that differs from the first or third material.
[14]
The Tiled display arrangement of claims 10 to 13, wherein the second layer is fixed to the second substrate or applied to the second substrate before it is cured.
[15]
Tiled display arrangement according to any of claims 10 to 13, wherein the second layer is glued or laminated to the second substrate.
[16]
A tilted display arrangement according to any of claims 10 to 14, wherein the first and second substrates of each tile are fixed to each other.
[17]
17. Tiled display arrangement as claimed in claim 16, wherein the first and second substrates of each tile are fixed to each other with a limited temperature-activated adhesive, such as a temperature-activated adhesive tape, or are glued together with glue applied to a thin carrier film. .
[18]
A tiled display arrangement according to any of claims 10 to 17, wherein at least one of the first and second substrate is fixed to a support frame.
[19]
The tiled display arrangement of any preceding claim, wherein the first substrate supports an image forming device with liquid crystals.
[20]
A method of producing a tiled display arrangement comprising at least two neighboring files for a transparent display system or a display display system, wherein each tile is associated with a display screen with pixel locations, each of the two neighboring tiles having at least one first substrate of a first material, the method comprising: fixing at least one first layer of a second material to the first substrate, characterized in that the thickness of the at least one first layer is smaller than the thickness of the first substrate; the coefficient of thermal expansion of the first substrate is smaller than the coefficient of thermal expansion of the at least one first layer and wherein the geometry and dimensions of L> i_ £ _ x. each tile be such that the distance between the at least two tiles is less than 0.5 mm on the display screen, fixing the at least one first substrate to a support frame, the at least one substrate having slanting on lateral sides thereof forming first inclined glue surfaces, and the carrier having second inclined glue surfaces that match the first inclined glue surfaces and the first and second inclined glue surfaces are fixed to each other with a limited temperature-activated adhesive, such as a temperature-activated adhesive tape, or joined together glued with glue applied to a thin carrier film in such a way that sliding and crawling within the adhesive tape or glue is reduced.
[21]
The method of claim 20, wherein an angle of inclination of the first inclined surfaces makes an acute angle with an optical axis of the tile perpendicular to the tile.
[22]
The method of any of claims 20 to 21, further comprising bringing the first substrates of adjacent tiles into mechanical contact with each other.
[23]
The method of any one of claims 20 to 22, further comprising forming a Fresnel Lens on the first layer of second material.
[24]
The method of claim 23, wherein the first layer of the second material is modified by engraving to form the Fresnel Lens.
[25]
The method of claim 23, wherein the first layer of second material is formed into a Fresnel lens.
[26]
The method of claim 25, wherein the Fresnel lens is glued or laminated to the first substrate.
[27]
The method of claim 25, wherein the first layer of second material is applied to the first substrate as a resin before it is formed into a Fresnel lens and cured on the first substrate.
[28]
A method according to any of claims 20 to 22, wherein a Fresnel lens is engraved directly into the first substrate.
[29]
The method of any one of claims 20 to 27, wherein each display tile has a second substrate, further comprising fixing a second layer to the second substrate.
[30]
The method of claim 29, wherein the second layer is applied to the second substrate and then cured.
[31]
The method of claim 29, wherein the second layer is glued or laminated to the second substrate.
[32]
The method of any one of claims 29 to 31, wherein the first and second substrates of each tile are fixed to each other.
[33]
The method of any one of claims 29 to 32, wherein the first and second substrates of each tile are fixed to each other with limited temperature-activated adhesive, such as a temperature-activated adhesive tape, or glued together with a thin carrier film applied to it glue.
[34]
The method of any one of claims 20 to 33, wherein the second substrate is fixed to the support frame.
[35]
The method of any one of claims 20 to 34, further comprising carrying a liquid crystal imaging device with a first substrate.
[36]
36. Tile for a tiled display arrangement for a transparent display system or display system, the tile comprising a display screen with pixel locations, comprising: at least one first substrate of a first material, which has characteristics of "rigidity and sturdiness, and at least one first layer of a second material fixed to the first substrate, characterized in that the thickness of the at least one first layer is smaller than the thickness of the first substrate, the coefficient of thermal expansion of the first substrate is smaller then the coefficient of thermal expansion of the at least one first layer, the at least one first substrate being fixed to a support frame, the at least one substrate having slanting on lateral sides thereof that form first inclined adhesive surfaces, and the carrier second inclined adhesive surfaces has fit to the first inclined adhesive surfaces and the first and second inclined adhesive surfaces surfaces are fixed to each other with a limited temperature-activated adhesive, such as a temperature-activated adhesive tape, or are glued together with adhesive applied to a thin carrier film such that sliding and creeping within the adhesive tape or adhesive is reduced.
[37]
Tile according to claim 36, wherein an angle of inclination of the first inclined surfaces makes an acute angle with an optical axis of the tile perpendicular to the tile.
[38]
The tile of claim 37 wherein the inclination angles of the inclined surfaces of opposite lateral sides are inclined at different angles, so that there is no shear plane between the support and the at least one substrate that is parallel to the optical axis or orthogonal thereto.
[39]
Tile according to any of claims 36 to 38, wherein the coefficient of thermal expansion of the first substrate is lower than or equal to 9.5 10 6 1 / ° K between 273 ° K and 373 ° K.
[40]
The tile of claim 38 or 39, wherein the first layer of second material comprises a Fresnel lens.
[41]
The tile of claim 40, wherein the first layer of the second material is modified by engraving to form the Fresnel Lens.
[42]
The tile of claim 40, wherein the first layer of second material is formed into a Fresnel Lens.
[43]
The tile of any one of claims 40 to 42, wherein the Fresnel Lens is glued or laminated to the first substrate.
[44]
The tile of any one of claims 40 to 43, further comprising a second substrate that supports a second layer.
[45]
The tile of claim 44, wherein the second layer is fixed to the second substrate.
[46]
The tile of claim 44 or 45 wherein the second substrate is made of a third material that is the same material as the first substrate.
[47]
The tile of claim 44, 45 or 46, wherein the second layer is made of a fourth material that is different from the first or third material.
[48]
A tile according to any of claims 44 to 47, wherein the second layer is applied to the second substrate before curing takes place.
[49]
Tile according to any of claims 44 to 47, wherein the second layer is glued or laminated to the second substrate.
[50]
The tile according to any of claims 44 to 49, wherein the first and second substrates of the tile are fixed to each other.
[51]
The tile according to claim 50, wherein the first and second substrates of the tile are fixed to each other with a limited temperature-activated adhesive, such as a temperature-activated adhesive tape, or are glued together with glue applied to a thin carrier film.
[52]
The tile of any one of claims 36 to 51, wherein the first carrier substrate supports a liquid crystal imaging device.

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法律状态:
2018-02-08| FG| Patent granted|Effective date: 20171116 |

优先权:

申请号 | 申请日 | 专利标题

GB1403516.6A|GB2523742A|2014-02-28|2014-02-28|Seamless tiled displays|

GB1403516.6|2014-02-28|

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