• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    A reflector having a light diffusing property that suppresses reflection in a wide viewing range and particularly bright in a specific viewing range, and a reflective liquid crystal display device using the reflector are obtained. A plurality of concave portions 3a, 3b, 3c having light reflectivity are formed on the surface of the base material, each of which has a specific longitudinal section, each passing through the deepest point of the concave portion, the specific longitudinal section having an inner surface thereof. The shape consists of a first curve extending from one periphery of the recess to the deepest point and a second curve extending from the deepest point of the recess to the other periphery successively to the first curve, the absolute value of the inclination angle with respect to the surface of the base material of the first curve. The average value of is formed larger than the average value of the absolute value of the inclination angle with respect to the surface of the base material of the second curve.
    公开号:KR20030003032A
    申请号:KR1020020036113
    申请日:2002-06-26
    公开日:2003-01-09
    发明作者:요시이가쯔마사；모리이께다쯔야；오모떼겐지；가노미쯔루
    申请人:알프스 덴키 가부시키가이샤；
    IPC主号:
    专利说明:

    Reflector and Reflective Liquid Crystal Display {REFLECTOR AND REFLECTIVE LIQUID CRYSTAL DISPLAY}
    [17] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector and a reflective liquid crystal display device, and more particularly, to a reflector having a reflection characteristic that is particularly brighter than other times when the reflected light is observed at a specific time, and a reflective liquid crystal display device using the reflector.
    [18] There are two types of liquid crystal display devices, transmissive and reflective. Among these, the reflective liquid crystal display is a light that depends on external light or is visually recognized using a front light, and is used for electronic devices such as portable computers, electronic calculators, digital clocks, communication devices, game machines, measuring instruments, and electronic bulletin boards. It is used a lot as a display part.
    [19] In the reflective liquid crystal display device, as shown in FIG. 8, the light transmissive display side substrate 20 and the light reflective side substrate 10 are disposed to face each other with the liquid crystal layer 30 interposed therebetween. The outer surface of the display side substrate 20 is a display surface, and a reflection layer 12 is formed on the reflection side substrate 10. In the reflective liquid crystal display device, external light incident from the display surface passes through the display side substrate 20 and the liquid crystal layer 30 and is reflected by the reflection layer 12 of the reflection side substrate 10, and the reflected light is reflected. The image is visually recognized by passing through the liquid crystal layer 30 again and exiting from the display surface.
    [20] In FIG. 8, the reflective side substrate 10 includes a glass substrate 11, a reflective layer 12, an intervening layer 13, a color filter layer 14, a planarization layer 15, and an indium tin oxide (ITO) film in order from the lower layer. Alternatively, the transparent electrode 16 and the alignment layer 17 formed of a nesa film or the like are stacked, and the display side substrate 20 disposed opposite to the display surface side with the liquid crystal layer 30 interposed therebetween has a liquid crystal layer 30 side. In this order, the transparent electrode 23, the glass substrate 24, and the optical modulation layer (polarizing plate, retardation plate, etc.) 25 composed of the alignment layer 21, the insulating layer 22, the ITO film or the nesa film, etc. are stacked in this order. Is done.
    [21] In the illustrated liquid crystal display device, the color filter layer 14 of the reflection side substrate 10 is formed by arranging colored films of R (red), G (green), and B (blue) in a stripe order in parallel. The stripe-shaped transparent electrodes 16 are arranged in parallel with the colored films. In the display substrate 20, the transparent electrodes 23 are arranged in parallel so as to be orthogonal to the transparent electrodes 16 of the reflective substrate, and the display transparent electrode 23 and the reflective transparent electrode 16 intersect. A portion of the liquid crystal layer 30 to form a pixel corresponding to each color.
    [22] Further, in the liquid crystal display device, the front light is further disposed outside the display side substrate 20 as necessary (not shown), but in this case, the light of the front light is the same as the external light and the display side substrate 20 and the liquid crystal layer ( 30 is reflected and reflected by the reflective layer 12 of the reflective side substrate 10, and the reflected light passes through the liquid crystal layer 30 again and exits from the display surface.
    [23] The reflective layer 12 of the reflective side substrate 10 can be roughly divided into a smooth reflection type and a diffuse reflection type. In the smooth reflection type shown in Fig. 9 (a), the incident angle (absolute value) and the outgoing angle (absolute value) of light with a normal line perpendicular to the display surface between the reflective surfaces of the reflective layer 12 (a) are smoothly finished. ) Becomes the same. Therefore, when observing this display surface, there arises a problem that the brightness of the display surface varies in the positional relationship between the light source and the viewpoint, and the light source or the face of the observer is reflected to lower visibility. In order to solve this problem, in the diffuse reflection type, as shown in Figs. 9B and 10, a large number of minute irregularities (concave portions 31 in Fig. 10) are formed on the reflective surface of the reflective layer 12 (b). It is formed irregularly adjacent. Therefore, in the diffuse reflection type, external light incident at a predetermined angle is diffusely reflected on the surface of the reflective layer 12 (b) so that the reflected light is diffused and the brightness does not change even when the viewpoint is shifted. Get the device.
    [24] Various materials have been proposed in terms of reflection characteristics and productivity in terms of the material of the diffuse reflection type reflection layer 12 (b), the shape and distribution of the unevenness, and the formation method of the unevenness.
    [25] As a method of forming the unevenness, light is irradiated to the surface of a flat resin base material made of a photosensitive resin layer or the like through a pattern mask, and a plurality of fine spherical recesses 31... Forming a surface, and depositing or plating aluminum, silver, or the like on the surface where the recess is formed, or by inserting a punch (punching tool) having a hemispherical tip on the surface of a smooth base material such as an aluminum plate or a silver plate, There are known a method of forming a large number of fine spherical recesses 31...
    [26] The shape of the concave portion 31 is conventionally a spherical surface having a depth distributed within the range of 0.1 μm to 3 μm, and the mutual distance is within the range of 5 μm to 50 μm between the pitch (distance between centers) between adjacent concave portions. It is set irregularly.
    [27] Electronic devices such as desktop electronic calculators and portable computers, for example, are shown on the display surface of the liquid crystal display device as shown in FIG. 11 (a) and an example of a portable computer in FIG. 11 (b). When visually observing, the display surface is often observed obliquely downward. That is, the viewpoint Ob of the observer is inclined downward of the display surface by an angle θ with respect to the normal line X perpendicular to the display surface.
    [28] On the other hand, in a reflective liquid crystal display device, illumination is often dependent on external light, and the external light is an optical modulation layer 25 such as a polarizing plate, two transparent electrodes 16 and 23, a liquid crystal layer 30, Attenuation is greatly attenuated while passing through the color filter layer 14 and the other layers while the incident light is diffused widely by the reflection type 12 (b) in the diffuse reflection type, so that the display screen at the time of observation Ob Is usually quite dark. Therefore, when there is little external light, visibility will fall significantly. In particular, in the conventional reflective liquid crystal display device, since the shape and arrangement of the concave portion are designed so as to eliminate the change of brightness with the visual as much as possible, sufficient brightness is observed when observing in a specific viewing range, which is obliquely lower than the normal line X. There was a problem that could not be obtained. In addition, even when the front light is used, there is a problem of attenuation or diffusion like the external light, and it is difficult to secure sufficient brightness in a specific viewing range without unnecessarily increasing the power consumption for lighting.
    [29] Thus, there is a need for a reflective liquid crystal display device that can suppress reflection in a wide viewing range and can observe the display screen particularly brightly in a specific viewing range.
    [30] SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and therefore an object thereof is to provide a reflector having a light diffusivity that suppresses reflection in a wide viewing range and particularly bright in a specific viewing range, and a reflective liquid crystal display device using the reflector. To provide.
    [1] 1 is a perspective view illustrating a reflector portion of an embodiment.
    [2] 2 is a perspective view showing one concave portion of the embodiment;
    [3] 3 is a cross-sectional view of a specific longitudinal section of the recess.
    [4] 4 is an explanatory diagram of reflection characteristics of the reflector of the embodiment;
    [5] 5 is a graph showing the relationship between the light receiving angle and the reflectance.
    [6] 6 is a cross-sectional view showing the layer structure of the reflective liquid crystal display device of the embodiment.
    [7] 7 is an explanatory diagram of a use state of the reflective liquid crystal display device of the embodiment;
    [8] 8 is a cross-sectional view showing an example of a general reflective liquid crystal display device.
    [9] FIG. 9A is a sectional view showing smooth reflection type and FIG. 9B is a reflection side substrate of each of the diffuse reflection type liquid crystal display devices.
    [10] 10 is a perspective view showing a conventional reflector portion.
    [11] Fig. 11 (a) is a perspective view showing the time when a desk computer computer is used, and Fig. 11 (b) is a visual observation of the portable computer.
    [12] * Description of symbols on the main parts of the drawings *
    [13] 1: reflector 2: base material
    [14] 3a, 3b, 3c: recessed portion 10: reflective side substrate
    [15] A: first curve B: second curve
    [16] X: Specific profile
    [31] In order to solve the above problems, the present invention provides a plurality of concave portions having light reflectivity on the surface of the base material, each of the concave portions has the following specific longitudinal section each passing through the deepest point of the concave portion, the specific longitudinal section is The inner surface is composed of a first curve extending from one periphery of the recess to the deepest point and a second curve extending from the deepest point of the recess to the other periphery successively to the first curve, the absolute angle of inclination of the first curve of the base material surface. A reflector is provided, characterized in that the average value of the values is larger than the average value of the absolute values of the inclination angle with respect to the surface of the base material of the second curve.
    [32] Since the reflector has a plurality of concave portions having light reflectivity on the surface of the base material, and the concave portions are formed as curved surfaces (concave surfaces), the reflector has a light diffusing property which ensures a wide display range and suppresses reflection.
    [33] Moreover, the inner surface shape of these recessed parts consists of a 1st curve and a 2nd curve which border the deepest point in a specific longitudinal section, and the average value of the inclination-angle absolute value with respect to the base material surface of a 1st curve is the base material surface of a 2nd curve. It is formed in a curve that is larger than the average value of the absolute value of the inclination angle for the. That is, the inclination of the first curve is relatively steep, the inclination of the second curve is relatively gentle, and the second curve is longer than the first curve.
    [34] Thus, the light reflected from the surface around the second curve is more than the light reflected around the first curve. In other words, the light beam density in the specular reflection direction with respect to the surface around the second curve is increased. Therefore, when the first curved direction of each concave portion is aligned in a specific direction (single or plural specific directions), the reflection intensity of the specific direction as a whole can be increased.
    [35] In the present invention, it is preferable that the plurality of concave portions are formed in the same direction of each particular longitudinal section and each first curve is oriented in a single direction.
    [36] As a result, the reflectance in the direction reflected from the surface around the second curve as a whole is increased. That is, it can be set as the reflection characteristic which suitably concentrated the reflected light toward a specific direction.
    [37] In the present invention, it is preferable that the inclination angle with respect to the surface of the base material at the position where the first curve and the second curve are in contact with each other is zero. When the inclination angle of the first curve is negative and the inclination angle of the second curve is positive, the inclination angle of the first curve gradually approaches zero on the negative side, and the inclination angle of the second curve gradually approaches zero on the plus side. It is more preferable that any inclination angle of the first curve and the second curve becomes zero at the position where both contact with each other.
    [38] As a result, the entire inner surface of the concave portion can be formed smoothly, so that the amount of reflection in the specular reflection direction can be avoided.
    [39] The maximum value of the absolute value of the inclination angle with respect to the surface of the base material of the first curve may be changed within a range of 2 ° to 80 °. In particular, it is preferable to carry out in 4 to 35 degrees.
    [40] The selection of the maximum value is preferably changed depending on the angle at which the observer views the display surface of the liquid crystal display device, but the range is preferably 2 ° to 80 °. When the angle exceeds 80 °, the angle of reflection on the side surface becomes so large that part of the reflected light darkens the field of view beyond the frame of the pixel of the reflective liquid crystal display device. When the maximum inclination angle is less than 2 °, the effect of biasing the distribution of the visual field of the reflected light amount may be insufficient, and thus the brightness required at a specific time may not be obtained. When applied to an electronic device such as a general desktop electronic calculator or a portable computer, the maximum value is more preferably within the range of 4 ° to 35 ° in view of the observer's normal view of the display surface of the liquid crystal display device. .
    [41] It is preferable that the depth of the said some recessed part is irregularly formed in 0.1 micrometer-3 micrometers.
    [42] When the depth of the recess is less than 0.1 mu m, the scattering effect of light is insufficient. When it exceeds 3 micrometers, the thickness of the base material for realizing this depth becomes so large that it is unsuitable also from a manufacturing standpoint. When the depths of the plurality of recesses are irregularly formed, the occurrence of moire fringes caused by the interference of light that is likely to occur when the depth of the recesses is regularly formed is prevented, and the peak concentration of the reflected light amount at a specific time is alleviated. As a result, the change in the amount of reflected light in the field of view becomes smooth.
    [43] It is preferable that the plurality of recesses are arranged irregularly adjacent to each other.
    [44] If the recesses are spaced apart, the recesses and the recesses become planar, so the planar reflection is increased and sufficient diffuse reflection effect cannot be obtained within the limited pixel region, and the recesses are preferably formed adjacent to each other. Moreover, since moire fringes generate | occur | produce if the recessed parts are arrange | positioned regularly, it is preferable to arrange | position a recessed part irregularly.
    [45] The present invention also provides a reflective liquid crystal display device equipped with any one of the above-mentioned reflectors. In particular, when the reflectors are formed so that the direction of each particular longitudinal section of the plurality of recesses is the same, and each first curve is oriented in a single direction, and the reflector is viewed from the observer side with the first curve of each recess It is preferably formed so as to be located above the second curve.
    [46] As such, when the first curves of all the concave portions are formed to be located above the second curve when viewed from the observer's side, external light or the like which is mainly incident from the upper side is usually shifted in the normal direction to the surface of the base material rather than the downward direction of the observer. You can.
    [47] In addition, when viewed from the observer's side, external light and the like mainly incident from the upper side are efficiently incident on the surface around the second curve, thereby increasing the total amount of reflected light.
    [48] Therefore, the amount of light reflected in the observer's line of sight increases, thereby realizing a reflective screen of a bright screen at the practical point of view.
    [49] The present invention also provides a reflector characterized in that the integral value of the reflectance in the reflection angle range smaller than the angle of specular reflection with respect to the surface of the base material is different from the integral of the reflectance in the reflection angle range larger than the angle of specular reflection.
    [50] According to the present invention, when the observer's normal viewing angle is shifted from the direction of regular reflection, the reflector capable of mainly reflecting light in the normal viewing angle direction can be used.
    [51] The present invention also provides a reflector in which the integral value of the reflectance in the reflection angle range smaller than the angle of specular reflection relative to the surface of the base material is different from the integral of the reflectance in the reflection angle range larger than the angle of specular reflection, and the reflectance of the reflector Provided is a reflection type liquid crystal display device characterized in that the reflection angle range in which the integral value is increased is formed above the angle of specular reflection with respect to the surface of the base material when viewed from the observer side.
    [52] According to the present invention, external light or the like mainly incident from the upper side can be shifted in the normal direction to the surface of the base material rather than the downward direction of the observer.
    [53] Thus, for example, when used as a display device for a mobile phone or a notebook PC, the amount of light reflected in the viewer's line of sight increases, thereby realizing a reflective screen liquid crystal display having a bright screen at the practical point of view.
    [54] Embodiment of the invention
    [55] EMBODIMENT OF THE INVENTION Next, although embodiment of this invention is described concretely using drawing, the following embodiment does not restrict this invention at all.
    [56] 1 is a view showing a reflector of the present embodiment. As shown in Fig. 1, the reflector 1 of the present embodiment has a plurality of concave portions 3a, 3b, 3c,... Which have a large number of light reflections on the surface S (reference surface) of, for example, a flat base material 2 made of aluminum. : Generally referred to as recesses 3 are formed irregularly adjacent to each other.
    [57] As for these recessed parts 3, a perspective view is shown in FIG. 2, and sectional drawing is shown in FIG. 3, the inner surface shape of the specific longitudinal cross-section X of the recessed part 3 is the deepest point D from one peripheral part S1 of the recessed part. It consists of the 2nd curve B which extends from the deepest point D of the recessed part to the other periphery part S2 in succession to the 1st curve A which reaches (), and the 1st curve A. These two curves are connected to each other with an inclination angle with respect to the base material surface S being zero at the deepest point D.
    [58] The inclination angle of the first curve A with respect to the base material surface S is steeper than the inclination angle of the second curve B, and the deepest point D is shifted in the x direction from the center O of the recess 3. In position. That is, the average value of the absolute value of the inclination angle with respect to the base material surface S of the 1st curve A is larger than the average value of the absolute value of the inclination angle with respect to the base material surface S of the 2nd curve B. FIG. The average value of the inclination-angle absolute value with respect to the base material surface S of the 1st curve A of the recessed parts 3a, 3b, 3c ... is irregularly formed in the range of 1-89 degrees. Moreover, the average value of the inclination-angle absolute value with respect to the base material surface S of the 2nd curve B of the recessed parts 3a, 3b, 3c ... is formed irregularly in 0.5-88 degree range.
    [59] Since the inclination angles of both curves change gently, the maximum inclination angle δmax (absolute value) of the first curve A is larger than the maximum inclination angle δb (absolute value) of the second curve. In addition, the inclination angle with respect to the surface of the base material of the deepest point D which the 1st curve A and the 2nd curve B contact | connects is 0, and the inclination angle is positive and the 1st curve A which is a negative value is positive. The second curve B, which is a value, is gently continued.
    [60] In the reflector of this embodiment, the maximum inclination angle δmax of each of the recesses 3a, 3b, 3c ... is irregularly formed within the range of 2 to 90 degrees. However, many concave portions are irregularly formed in the maximum inclination angle δ max in the range of 4 ° to 35 °.
    [61] Moreover, this recessed part 3 has a single local minimum (a point on the curved surface D whose inclination angle becomes zero). And the distance between this minimum point D and the base material surface S of the base material forms the depth d of the recessed part 3, and this depth d is the recessed part 3a, 3b, 3c ...). It is irregularly formed in the range of 0.1 micrometer-3 micrometers, respectively.
    [62] In this embodiment, each specific vertical end surface X of the recessed parts 3a, 3b, 3c ... is set to the same direction. Moreover, each 1st curve A is formed so that it may orientate in a single direction. That is, it is formed so that the x direction shown to FIG. 2, FIG. 3 may become the same in any recessed part.
    [63] In the reflector 1 of this embodiment, since each 1st curve A is formed so that it may be oriented in a single direction, the reflection characteristic will show in the direction of a regular reflection with respect to the base material surface S as shown in FIG. It is shifted.
    [64] That is, as shown in FIG. 4, the reflected light K with respect to the incident light J from the oblique upper side of the x direction is brighter in the direction shifted to the direction H with respect to the base material surface S than the direction K 0 of a specular reflection. The display range shifts.
    [65] As a result, as a comprehensive reflection characteristic of the specific longitudinal section X, the reflectance in the direction reflected by the surface around the second curve B increases. Therefore, it can be set as the reflection characteristic which suitably concentrated the reflected light to a specific direction.
    [66] That is, FIG. 5 irradiates external light to the display surface of the reflecting apparatus 1 of this embodiment at an incident angle of 30 degrees, and the light receiving angle is centered on 30 degrees which is the direction of regular reflection with respect to the display surface (base material surface). The relationship between the light-receiving angle (θ °) and the brightness (reflectivity) when moved from the vertical line position (0 °) to 60 ° is shown. In FIG. 5, the relationship of the light reception angle and reflectance of the reflection type liquid crystal display device which used the reflector which has the spherical recessed part conventionally used as a comparative example was also shown.
    [67] As can be seen from FIG. 5, the comparative example showed almost equal reflectance within the range of the light receiving angle of about 15 ° to about 45 °, whereas in the reflecting apparatus 1 of the present embodiment, the specular reflection on the base material surface S is shown. The integral value of the reflectance in the reflection angle range smaller than 30 degrees, which is the angle of, is larger than the integral value of the reflectance in the reflection angle range larger than the angle of the specular reflection. That is, sufficient brightness can be achieved in the field of view around 20 degrees.
    [68] Although the manufacturing method of the reflector 1 is not specifically limited, For example, it can manufacture as follows.
    [69] First, a punch (punching tool) having a tip shape obtained by converting the shape of the concave portion into a convex surface is produced, the tip of the punch is opposed to the aluminum base material, and the orientation of the punch relative to the aluminum base material is kept constant. In one state, the punching stroke is changed irregularly, and the punching interval is changed irregularly to punch the entire surface of the predetermined region of the aluminum base material. The punching stroke adjusts the depth of the recess to fall within a predetermined range. The punching interval is adjusted so that no moire pattern occurs.
    [70] 6 is a cross-sectional view showing the layer structure of the reflective liquid crystal display device 100 in which the reflecting device 1 of the present embodiment is mounted.
    [71] In FIG. 6, the reflective liquid crystal display device 100 is formed by opposing the light transmissive display side substrate 20 and the light reflective side substrate 10 with the liquid crystal layer 30 interposed therebetween. The outer side surface of the display side board | substrate 20 is a display surface, and the reflecting body 1 is attached to the reflection side board | substrate 10. As shown in FIG.
    [72] The reflective substrate 10 may be a glass substrate 11, a reflector 1, a transparent interlayer 13, a color filter layer 14, a transparent planarization layer 15, an indium tin oxide (ITO) film, or the like, in order from the lower layer. A transparent electrode 16 and an alignment layer 17 made of a nesa film or the like are stacked, and the display-side substrate 20 disposed opposite to the display surface side with the liquid crystal layer 30 interposed therebetween from the liquid crystal layer 30 side. A transparent electrode 23 made of an alignment layer 21, an insulating layer 22, an ITO film or a nesa film, a glass substrate 24, and an optical modulation layer (polarizing plate, retardation plate, etc.) 25 are sequentially stacked. .
    [73] Moreover, the transparent electrode 16 and the transparent electrode 23 which interposed the liquid crystal layer 30 are formed in the stripe shape orthogonal to each other, and comprise the simple matrix type liquid crystal device whose intersection area | region becomes a pixel.
    [74] In the reflective liquid crystal display device 100, the reflector 1 is arranged such that the first curve A of each of the recesses 3a, 3b, 3c ... is on the x-direction side than the second curve B having a gentle slope. It is installed. Then, the characters and the like are displayed with the x direction upward.
    [75] 7 is an explanatory diagram showing a state of use of the liquid crystal display device 100. In addition, in FIG. 7, only the first curve A and the second curve B of the reflective liquid crystal display device 100 are shown for convenience of description, and other components are not shown.
    [76] The reflective liquid crystal display device 100 is mounted on a mobile phone or a notebook PC with the x direction upward. In this case, the reflective liquid crystal display device 100 is generally installed or supported at an angle to the horizontal plane with the x direction obliquely upward as shown in FIG. That is, at the time of use, it is formed so that the 1st curve A of each recessed part may be located above the 2nd curve B when seen from the observer side. In addition, it is common for an observer to look down at the reflective liquid crystal display device 100 at an angle above the horizontal.
    [77] In this case, since the reflected light K of the external light (incident light J) mainly incident from the upper side is mainly reflected from the surface around the second curve B, it is difficult to be reflected downward in the observer as described with reference to FIG. 5. The reflection is mainly focused in a direction upward from the direction of specular reflection K 0 .
    [78] Therefore, a bright display range can be realized in practical use by matching the observer's normal viewing range with the bright display range.
    [79] In the reflective liquid crystal display of the embodiment shown in FIG. 6, the reflector 1 is formed of a layer different from the transparent electrode 16, but the transparent electrode 16 itself is formed of the reflector 1, and the transparent electrode ( When 16) is formed at the position of the reflector 1 of FIG. 6, the transparent electrode can also serve as a reflector, thereby simplifying the layer structure of the reflective liquid crystal display device.
    [80] If the reflector is formed of a semi-transmissive semi-reflective base material such as a half mirror and an illumination plate is disposed on the back of the liquid crystal panel, the reflector becomes reflective when the external light is bright, and the illumination plate is dark when the external light is dark. When turned on, a semi-transmissive semi-reflective liquid crystal display device which can be used as a transmissive type can be obtained. This semi-transmissive semi-reflective liquid crystal display device is also included in the present invention.
    [81] Further, when the front light is formed on the display surface side of the display side substrate 20, a front light type liquid crystal display device which uses only external light when the external light is bright, and lights the front light when the external light is dark, is obtained. Can be. This front light type liquid crystal display device is also included in the present invention.
    [82] The liquid crystal drive method of the present invention is not particularly limited, but the present invention can be similarly applied to an active matrix type or a segment type using a thin film transistor or a thin film diode in addition to the simple matrix type. All of these liquid crystal display devices are included in the present invention.
    [83] The reflector of the present invention is provided with a plurality of recesses having light reflectivity, each recess having a specific longitudinal section as follows, each passing through the deepest point of the recess, the specific longitudinal section having an inner surface shape from one peripheral part of the recess. A first curve reaching the deepest point and a second curve extending from the deepest point of the recess to the other periphery successively to the first curve, and the average value of the absolute value of the inclination angle with respect to the surface of the base material of the first curve is Since it is formed larger than the average value of the inclination-angle absolute value with respect to the surface of a base material, it can diffusely reflect incident light and suppress the reflection in a wide viewing range, and can also make the amount of reflected light in a normal viewing range of an observer larger.
    [84] The reflection type liquid crystal display device of the present invention equipped with the reflector of the present invention is a reflection type liquid crystal display device in which the reflection is suppressed in a wide viewing range, and the visibility that is particularly bright when the display surface is observed from a specific view point is improved.
    权利要求:
    Claims (11)
    [1" claim-type="Currently amended] A plurality of recesses having light reflectivity are formed on the surface of the base material, each recess having a specific longitudinal section as follows, each passing through the deepest point of the recess,
    The specific longitudinal section is composed of a first curve whose inner surface shape extends from one periphery of the recess to the deepest point, and a second curve extending from the deepest point of the recess to the other periphery successively to the first curve, and the base material of the first curve. A reflector, characterized in that the average value of the absolute value of the inclination angle with respect to the surface is larger than the average value of the absolute value of the inclination angle with respect to the surface of the base material of the second curve.
    [2" claim-type="Currently amended] The method of claim 1,
    And the plurality of concave portions are formed in the same direction of each particular longitudinal section and each first curve is oriented in a single direction.
    [3" claim-type="Currently amended] The method according to claim 1 or 2,
    The first curve and the second curve is a reflector, characterized in that the inclination angle with respect to the surface of the base material at a position in contact with each other is zero.
    [4" claim-type="Currently amended] The method according to claim 1 or 2,
    And a maximum value of the absolute value of the inclination angle with respect to the surface of the base material of the first curve is in the range of 2 ° to 90 °.
    [5" claim-type="Currently amended] The method according to claim 1 or 2,
    A reflector, characterized in that the maximum value of the absolute value of the inclination angle with respect to the surface of the base material of the first curve is in the range of 4 ° to 35 °.
    [6" claim-type="Currently amended] The method according to claim 1 or 2,
    Reflector, characterized in that the depth of the plurality of recesses are irregularly formed in the range of 0.1㎛ ~ 3㎛.
    [7" claim-type="Currently amended] The method according to claim 1 or 2,
    And the plurality of recesses are irregularly disposed adjacent to each other.
    [8" claim-type="Currently amended] A reflective liquid crystal display device comprising the reflector according to any one of claims 1 to 7.
    [9" claim-type="Currently amended] The method of claim 8,
    The reflector is formed such that the direction of each particular longitudinal section of the plurality of recesses is the same, and each first curve is oriented in a single direction, and the reflector is viewed from the observer's side when the first curve of each recess is viewed. A reflective liquid crystal display device, characterized in that it is located above the second curve.
    [10" claim-type="Currently amended] A reflector characterized in that the integral value of the reflectance in the reflection angle range smaller than the angle of specular reflection with respect to the surface of the base material is different from the integral of the reflectance in the reflection angle range larger than the angle of specular reflection.
    [11" claim-type="Currently amended] The reflection type liquid crystal according to claim 10 is provided, and the reflection angle range in which the integral value of the reflectance of the reflector is increased is formed so as to be higher than the angle of normal reflection with respect to the surface of the base material when viewed from the observer's side. Display.
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    同族专利:
    公开号 | 公开日
    US20030001995A1|2003-01-02|
    EP1271187A3|2004-09-22|
    CN1395116A|2003-02-05|
    CN1184496C|2005-01-12|
    KR100478574B1|2005-03-28|
    TWI266103B|2006-11-11|
    EP1271187A2|2003-01-02|
    US6947107B2|2005-09-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2001-06-28|Priority to JPJP-P-2001-00197360
    2001-06-28|Priority to JP2001197360A
    2002-06-26|Application filed by 알프스 덴키 가부시키가이샤
    2003-01-09|Publication of KR20030003032A
    2005-03-28|Application granted
    2005-03-28|Publication of KR100478574B1
    优先权:
    申请号 | 申请日 | 专利标题
    JPJP-P-2001-00197360|2001-06-28|
    JP2001197360A|JP3515544B2|2000-07-03|2001-06-28|Reflector and reflective liquid crystal display|
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