• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a transflective liquid crystal screen comprising a plurality of superimposed layers, ie a first outer layer (1) comprising a polarizing filter, a second layer (2) comprising electrodes, and a third layer (3) comprising crystals. liquids, a fourth layer (4) having electrodes, a fifth layer (5) having a polarizing filter, and a sixth layer (6) in the form of a backlighting screen including an electroluminescent panel element. The screen comprises another additional transparent layer (7), arranged between the fifth layer (5) and the sixth layer (6), this additional transparent layer (7) comprising a phosphorescent material. The invention also relates to an electronic device or a timepiece comprising such a screen.
    公开号:CH714306A1
    申请号:CH01334/17
    申请日:2017-11-07
    公开日:2019-05-15
    发明作者:Cavalca Fabrizio
    申请人:Fgp Capital Sa；
    IPC主号:
    专利说明:

    Description: The present invention relates to a liquid crystal screen, in particular monochrome LCD screens.
    Liquid crystal displays (LCD) are used for countless applications today. From cell phones to television to scientific industrial controllers. Historically, these screens have been and are still used today in watches under various endings. The LCD screen allows a very precise reading of the time, and offers the possibility of expressing various pre-programmed functions in the CPU.
    An LCD screen works by the principle of superimposing several filters. This operating principle captures ambient light and the crossing of polarizing filters associated with the current flow in the electrodes allows the display of information by an optical effect.
    The limits of this system are precisely the capture of ambient light. Indeed, beyond a certain brightness, the system continues to operate on the same principle, however, the eye is no longer able to discern the resolution of the screen. An impression of non-operation then appears and it is necessary to illuminate the screen by an external source to find correct operation.
    To overcome this effect, a backlight system has been developed. This system, by electrically lighting a LED bulb as a rule, therefore allows information to be read when the ambient light is insufficient.
    The major drawback of this principle is twofold:
    Firstly, with regard to devices operating on the battery principle (rechargeable or replaceable) consumption is considerably increased and therefore the autonomy considerably reduced.
    Second, the user is forced to activate the lighting by generally pressing a button that is not necessarily easily accessible in the dark.
    The object of the present invention is to provide a transflective liquid crystal screen comprising a set of superimposed layers, ie a first external layer comprising a polarizing filter, a second layer comprising electrodes, a third layer comprising liquid crystals, A fourth layer comprising electrodes, A fifth layer comprising a polarizing filter, and A sixth layer in the form of a backlit screen () including an electroluminescent panel element. The screen has another additional transparent layer, arranged between the fifth and the sixth layer, this additional transparent layer comprising a phosphorescent material.
    In one embodiment, the other additional transparent layer comprises a phosphorescent phosphor pigment emitting light in the visible spectrum.
    Preferably, the other transparent layer comprises a phosphorescent material which stores the light, in order to then restore it in low light conditions.
    In one embodiment, the phosphorescent material comprises a compound expressed by Mal2O4 as a matrix, in which M consists of strontium (Sr) and barium (Ba), of europium (Eu) doped in said matrix as activator and dysprosium (Dy) doped in said matrix as coactivator.
    In another embodiment, the phosphorescent material comprises a compound expressed by Mal2O4 as matrix, in which M consists of strontium (Sr) and calcium (Ca), of europium (Eu) doped in said matrix as activator and dysprosium (Dy) doped in said matrix as coactivator.
    In yet another embodiment, the phosphorescent material comprises a compound expressed by Mal2O4 as a matrix, in which M consists of strontium (Sr) and barium (Ba) and calcium (Ca), europium (Eu) doped in said matrix as activator and dysprosium (Dy) doped in said matrix as coactivator.
    In one embodiment, the phosphorescent material of the additional transparent layer stores the light produced by the sixth layer in the form of a backlit screen.
    Preferably, the additional transparent layer transmits at least 80% of the light emitted by the sixth layer in the form of a backlit screen, in particular by its transparency on the one hand and by its reactivation of somewhere else.
    The screen according to the present invention can be arranged in different electronic devices comprising a transflective screen.
    In particular, a timepiece may include a screen according to one of the preceding claims.
    The characteristics of the invention will appear more clearly on reading the description of several embodiments given solely by way of example, in no way limiting with reference to the schematic figures, in which:
    CH 714 306 A1
    Fig. 1 represents an exploded view of a transflective screen comprising an additional phosphorescent layer; and fig. 2 shows a comparison of two watches, one comprising a conventional transflective screen and the other comprising a transflective screen according to the present invention.
    As illustrated in FIG. 1, a transflective liquid crystal screen according to the present invention comprises a set of superimposed layers, namely:
    a first external layer 1 comprising a polarizing filter,
    - a second layer 2 comprising electrodes,
    a third layer 3 comprising liquid crystals,
    a fourth layer 4 comprising electrodes,
    a fifth layer 5 comprising a polarizing filter, and
    - a sixth layer 6 in the form of a backlit screen including an electroluminescent panel element.
    The screen further comprises another additional transparent layer 7, arranged between the fifth layer 5 and the sixth layer 6, this additional transparent layer 7 comprising a phosphorescent material.
    In the comparison illustrated in FIG. 2, a first watch 8, the one on the left has a transflective screen according to the present invention while the second watch 9, the one on the right has a conventional transflective screen.
    More specifically, the screen of the first watch 8 has on its additional transparent layer 7 SuperLuminova®, a luminescent substance which makes it possible to read the time in the dark. Super-Luminova® stores the light, then returns it in low light conditions, as shown.
    In particular, in this example, the color of the Super-Luminova® used is green and its reference is G1X.
    Thanks to the present invention, the pigments of Super-Luminova® recover the ambient light and retransmit it in the half-light as they do for analog watches, thus considerably reducing the need for lighting of the LED bulb diffusing the light in front of the reflector.
    The Super-Luminova® stores the light produced by the sixth layer (6) in the form of a backlit screen. According to the present invention, the backlight screen operates in a conventional manner.
    Thus, the backlight screen is used between 30 and 35% less compared to a conventional transflective liquid crystal screen. In addition, the capacity of an accumulator is saved by at least 20%.
    Another advantage of the present invention is that in the dark, the brightness of the screen, without using the backlight, is improved by at least 15%.
    权利要求:
    Claims (8)
    [1]
    claims
    1. Transflective liquid crystal screen comprising a set of superimposed layers, namely:
    - a first external layer (1) comprising a polarizing filter,
    - a second layer (2) comprising electrodes,
    - a third layer (3) comprising liquid crystals,
    - a fourth layer (4) comprising electrodes,
    - a fifth layer (5) comprising a polarizing filter, and
    - a sixth layer (6) in the form of a backlit screen including an electroluminescent panel element, characterized in that it comprises another additional transparent layer (7), arranged between the fifth layer (5) and the sixth layer (6), this additional transparent layer (7) comprising a phosphorescent material.
    [2]
    2. Screen according to claim 1, in which the other additional transparent layer (7) comprises a phosphorescent phosphor pigment emitting light in the visible spectrum.
    [3]
    3. Screen according to one of claims 1 or 2, wherein the other additional transparent layer (7) comprises a phosphorescent material storing the light, to then restore it in low light conditions.
    [4]
    4. Screen according to one of the preceding claims, in which the phosphorescent material of the additional transparent layer (7) stores the light produced by the sixth layer (6) in the form of a backlit screen.
    [5]
    5. Screen according to one of the preceding claims, in which the additional transparent layer (7) transmits at least 80% of the light emitted by the sixth layer (6) in the form of a backlit screen.
    [6]
    6. Screen according to one of the preceding claims, in which the phosphorescent material comprises a compound expressed by Mal2O4 as matrix, in which Μ consists of strontium (Sr) and barium (Ba) and / or calcium (Ca) , europium (Eu) doped in said matrix as an activator and dysprosium (Dy) doped in said matrix as a coactivator.
    [7]
    7. Electronic device comprising a screen according to one of the preceding claims.
    CH 714 306 A1
    [8]
    8. Timepiece comprising a screen according to one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    CH714306B1|2022-01-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH09281487A|1996-04-15|1997-10-31|Nippon Synthetic Chem Ind Co Ltd:The|Liquid crystal display device|
    JPH10306278A|1997-05-07|1998-11-17|N P Tsukuba:Kk|Luminous member and watch face using the luminous member|
    US20020071069A1|1997-08-01|2002-06-13|Koji Nakagawa|Light scattering type liquid crystal display panel for timepiece|
    US7123317B2|2003-10-14|2006-10-17|Monerey International, Ltd.|Liquid crystal display with fluorescent material|
    WO2016113417A1|2015-01-15|2016-07-21|Hublot Sa, Genève|Method for producing a composite material with a glass matrix|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH01334/17A|CH714306B1|2017-11-07|2017-11-07|Liquid crystal display.|CH01334/17A| CH714306B1|2017-11-07|2017-11-07|Liquid crystal display.|
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