WO2014205985A1 - 导光板及其制作方法、背光源及透明显示装置 - Google Patents

导光板及其制作方法、背光源及透明显示装置 Download PDF

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Publication number
WO2014205985A1
WO2014205985A1 PCT/CN2013/087399 CN2013087399W WO2014205985A1 WO 2014205985 A1 WO2014205985 A1 WO 2014205985A1 CN 2013087399 W CN2013087399 W CN 2013087399W WO 2014205985 A1 WO2014205985 A1 WO 2014205985A1
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WIPO (PCT)
Prior art keywords
transparent
guide plate
light guide
transparent substrate
light
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Application number
PCT/CN2013/087399
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English (en)
French (fr)
Inventor
鹿岛美纪
秦广奎
张培林
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京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2014205985A1 publication Critical patent/WO2014205985A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide

Definitions

  • Embodiments of the present invention relate to a light guide plate, a method of fabricating the same, a backlight, and a transparent display device. Background technique
  • the transparent display device displays an image on the display screen when a voltage is applied.
  • a voltage When no voltage is applied, the user can see the object on the back of the display through the display screen, generally a high transmittance LCD or OLED to prepare a transparent display.
  • the transparent display device relies on a light box located above the display screen to provide the light required to display an image.
  • the light box is large in size and heavy in weight, and it is impossible to produce a transparent display that is small in size and portable. Summary of the invention
  • Embodiments of the present invention provide a light guide plate that can be used to reduce the volume of a transparent display device and has a high transmittance, a method of fabricating the same, a backlight, and a transparent display device.
  • An aspect of the invention provides a light guide plate including a first transparent substrate and a second transparent substrate disposed opposite to each other; the first transparent substrate and the second transparent substrate are respectively provided with transparent electrodes on opposite sides thereof.
  • a polymer stabilized bile phase material layer is disposed between the two transparent substrates.
  • the polymer stabilized cholesteric material layer may include a chiral ionic liquid, a liquid crystal, and a polymerizable monomer; for example, the liquid crystal may be a nematic liquid crystal or a smectic liquid crystal.
  • the polymerizable monomer is an acrylate or an epoxy resin.
  • Another aspect of the present invention provides a backlight comprising the light guide plate as described above and a driving device adapted to the light guide plate.
  • the backlight may further include a light source on a side of the light guide plate and an insulating transparent plate between the light guide plate and the light source.
  • the heat insulating transparent plate may be an optical plate including polymethyl methacrylate.
  • the backlight may further include the light source not facing
  • a transparent display device comprising a backlight as described above.
  • the transparent display device may further include a transparent display panel on the light emitting side of the backlight.
  • the display panel may include a display area, and the light guide plate completely covers the display area from the light exiting side of the backlight.
  • a method of fabricating a light guide plate includes: forming transparent electrodes on opposite sides of a first transparent substrate and a second transparent substrate; and the first transparent substrate and the second transparent Forming a polymer stable cholesteric material layer between the substrates; sealing the polymer stable cholesteric material layer.
  • a chiral ionic liquid, a liquid crystal, and a polymerizable monomer are filled between the first transparent substrate and the second transparent substrate; and the chiral ionic liquid, liquid crystal, and the like are cured by ultraviolet rays.
  • the monomer is polymerized to form a polymer network between the liquid crystal molecules, thereby forming a polymer-stabilized bile phase material layer.
  • FIG. 1 is a schematic side view showing the structure of a light guide plate according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic side view of a transparent display device according to Embodiment 6 of the present invention
  • FIG. 3 is a top cross-sectional view of the transparent display device of FIG.
  • PSCT Polymer Stabilized Cholesteric Texture
  • the light guide plate of the embodiment includes a first transparent substrate 1 and a second transparent substrate 2 disposed opposite to each other; the first transparent substrate 1 and the second transparent substrate 2 are opposite to each other (the inner surface) ) Transparent electrodes are provided on both sides.
  • a PSCT layer 3 is provided between the two transparent substrates 1, 2.
  • a lower surface of the first transparent substrate 1 and an upper surface of the second transparent substrate 2 are respectively provided with transparent electrodes; during operation, a voltage is applied to the transparent substrates 1 and 2, thereby A voltage difference is generated between the transparent electrode on the first transparent substrate 1 and the transparent electrode on the second transparent substrate 2, and an electric field is applied to the PSCT layer 3, thereby changing the transmittance of the PSCT layer to realize light transmission.
  • a voltage is not applied to the transparent electrode or the transparent electrode on the first transparent substrate and the transparent electrode on the second transparent substrate are applied with the same voltage value, no voltage difference is generated between the two, and no electric field is applied.
  • the PSCT layer 3 is transparent, and the object behind the light guide plate can be seen through the PSCT layer 3. At this time, the light guide plate has an advantage of high light transmittance.
  • the transparent electrode may be an ITO (Indium Tin Oxide) electrode, an IZO (Indium Oxide) electrode or the like.
  • ITO Indium Tin Oxide
  • IZO Indium Oxide
  • the method of using the ITO electrode has the advantages of mature technology, convenient use of the tube, and convenient material selection.
  • the transparent electrodes may each be an integral electrode disposed on the opposite side of the first transparent substrate 1 and the second transparent substrate 2, or may be an electrode matrix composed of a plurality of small transparent conductive units.
  • the settings for the transparent electrodes can be configured as needed.
  • the light guide plate of the embodiment provides a backlight with good brightness uniformity by scattering (such as providing a white background to the transparent display device) in cooperation with the light source, and maintains good transparency through transmission when no display is required, thereby replacing the conventional
  • the light box with large volume, large area and large mass has the advantages of small size, compact structure and easy portability.
  • the light guide plate of the embodiment includes a first transparent substrate and a second transparent substrate disposed opposite to each other; A transparent substrate and the second transparent substrate are respectively provided with transparent electrodes on opposite surfaces, and a PSCT layer is disposed between the two transparent substrates.
  • the PSCT layer includes a chiral ionic liquid, a liquid crystal, and a polymerizable monomer; in the embodiment, the liquid crystal is, for example, a nematic liquid crystal or a smectic liquid crystal. The use of nematic liquid crystal or smectic liquid crystal is advantageous for improving light transmittance.
  • the polymerizable monomer is preferably an acrylate or an epoxy resin.
  • acrylate or epoxy resin further contributes to an increase in light transmittance.
  • the backlight of this embodiment comprises a light source, a light guide plate according to the first embodiment or the second embodiment, and a drive adapted to the light guide plate.
  • the backlight according to the embodiment adopts any of the above-mentioned light guide plates. Since the light guide plate exhibits a scattering state and a scattering state, it is determined by a voltage applied to the upper and lower sides of the PSCT layer, so the backlight described in this embodiment
  • the source is also provided with a driving device adapted to the backlight of the present invention while employing the light guide plate of the present invention.
  • the driving device may be a single driving circuit, and may be a driving circuit including a power source, or may be an external power supply access circuit, a transformer, a controller, and the like, and an integrated driving circuit.
  • the state of the shot provides a white background and light source for the display that works with it.
  • the backlight of the embodiment may be a side-lit backlight (ie, the light source is disposed on a side of the light guide plate), or may be a direct-lit backlight, for example, used in a non-transparent display device, such as an existing liquid crystal television or tablet.
  • a non-transparent display device such as an existing liquid crystal television or tablet.
  • a light guide plate applied to a backlight of a non-transparent display device applies a voltage while the display device is operating, exhibiting a scattering state, and provides a uniform backlight for the display device.
  • the backlight of the embodiment includes a light source, a light guide plate according to any one of the first embodiment or the second embodiment, and a driving device adapted to the light guide plate.
  • the light source may be a CCFL (Cold Cathode Tube) or an LED (Light Emitting Diode); the light source may be located at a side of the light guide plate, and a heat-insulating transparent between the light guide plate and the light source board.
  • CCFL Cold Cathode Tube
  • LED Light Emitting Diode
  • the light source may be located at a side of the light guide plate, and a heat-insulating transparent between the light guide plate and the light source board.
  • the light source is easy to form a high temperature during operation, the temperature is too high or the high temperature duration is too long, which causes the liquid crystal in the PSCT layer to lose the liquid crystal phase and become isotropic, resulting in poor operation of the PSCT layer.
  • a transparent heat insulation panel is introduced in the embodiment, and the transparent heat insulation panel is prevented.
  • the heat of the light source is directly transmitted to the light guide plate, and the transparent plate is used to facilitate the transmission of light emitted by the light source, and maintain good light transmitt
  • the heat insulating transparent plate may be an optical plate comprising polymethyl methacrylate (PMMA).
  • PMMA commonly known as plexiglass, is the main material of traditional light guides.
  • the optical plate including PMMA the light emitted from the light source can be transmitted to the light guide plate of the present invention as much as possible, thereby ensuring a high utilization rate of the light source.
  • a further improvement is made, in which the light source is not disposed toward the light exiting side of the light guide plate (ie, the light diverging direction).
  • the LED light source When the light source is an LED light source, the LED light source includes a light bar and is fixed on the light bar.
  • the direction in which the LED faces away from the strip is the direction in which the light diverges.
  • the LED is located on the side of the light guide plate, that is, at the same level as the light guide plate, light leakage occurs on the upper and lower sides, thereby reducing the effective utilization of the light source. Therefore, in order to ensure the effective utilization of the light of the light source, a reflecting plate is disposed on the light emitting side of the light source not facing the light guiding plate, and the light source is reflected back to the light source through the reflecting plate, and finally is conducted outward from the light guiding plate.
  • the reflecting plate may be a plurality of separate reflecting plates separately provided in each direction, or may be connected to each other to form a reflecting curved surface or a curved surface.
  • a reflective arc surface of one side may be used, and the opening is disposed opposite to the light guide plate.
  • the backlight of the embodiment of the present invention is transparent when no voltage is applied to the light guide plate.
  • the light source can be turned on to provide a white background.
  • the utility model When used to form a transparent device, the utility model has the advantages of small volume, light weight, and convenient carrying. , and it has the advantage of being structurally simple and easy to manufacture.
  • the transparent display device of the embodiment includes the backlight and the transparent display panel according to any one of Embodiments 3 to 5.
  • the backlight shown includes a light guide plate 12, and a light source located on a side of the light guide plate.
  • the light source is composed of a plurality of LEDs
  • reflecting plates 151, 152 and transparent heat insulating plates 14 on the upper and lower sides of the light source 13 to prevent light leakage.
  • the transparent display panel 11 is disposed on the light exit side of the backlight.
  • the transparent display device adopts the backlight of the embodiment of the present invention, and does not use a conventional light box, and therefore has the advantages of a single structure, a small size, a light weight, and portability.
  • Example 7
  • the transparent display panel 11 includes an upper polarizing plate, an upper transparent substrate, a liquid crystal layer, a lower transparent substrate, and a lower polarizing plate in order from top to bottom; the polarization angle between the upper polarizing plate and the lower polarizing plate is different by 90.
  • a transparent electrode is disposed on the opposite surface of the upper transparent substrate and the lower transparent substrate; when the display screen is operated, different voltages are applied to the transparent electrodes on the upper and lower transparent substrates to generate a voltage difference between the opposite transparent electrodes. Thereby, the liquid crystal layer can be driven to exhibit different working states.
  • the lower surface of the upper transparent substrate may also be sequentially spaced with a plurality of transparent color films of different colors.
  • the transparent color film of different colors is a red/green/blue (R/G/B) three-color transparent color film, and a mixture of three primary colors can form a display pattern of any color at the time of display.
  • the three-color transparent color film may also be disposed on the lower transparent substrate.
  • the transparent color film of different colors can be not limited to the R/G/B transparent color film, but can be other colors or include other colors such as transparent color, yellow color and the like according to the production or design requirements.
  • the display panel includes a display area
  • the light guide plate completely covers the display area from the light emitting surface of the backlight, that is, the area of the light guide plate is not less than the area of the display area, thereby completely covering the display area
  • the display area ensures that any point of the display area receives light from the light guide plate during display.
  • the light guide plate and the backlight of the embodiment of the present invention are used to maintain the transparent characteristic of the transparent display device in an inoperative state, and the backlight is used to provide backlight in the working state.
  • the utility model has the advantages of high light transmittance, good display effect and good uniformity, small volume, small mass, simple structure and convenient carrying.
  • this embodiment provides a method for fabricating a light guide plate, which can be performed as follows. First, the first and second transparent counters are provided, and transparent electrodes are formed on the opposite sides of the first transparent _3 ⁇ 4 and the second transparent _3 ⁇ 4: opposite.
  • the first and second transparent substrates may be a glass substrate, a plastic substrate, or the like.
  • a transparent electrode is formed on the opposite faces of the first transparent substrate and the second transparent substrate, and a conventional maturation process can be employed. If the transparent electrode is a whole layer of a non-patterned structure, for example, a transparent conductive material such as tantalum or niobium for forming a transparent electrode can be directly formed by electrodeposition, coating, sputtering, etc.; if the transparent electrode is a pattern Structure, which can be used to make transparent electrodes A conductive material such as ITO, ruthenium or the like is patterned to form a desired pattern.
  • the patterning process typically includes processes such as photoresist coating, exposure, development, etching, photoresist stripping, and the like.
  • a PSCT layer is formed between the first transparent substrate and the second transparent substrate.
  • a chiral ionic liquid, a liquid crystal, and a polymerizable monomer may be first filled between the first transparent substrate and the second transparent substrate; then, the hand is cured by ultraviolet rays.
  • the ionic liquid, the liquid crystal, and the polymerizable monomer form a polymer network between the liquid crystal molecules to form a PSCT layer.
  • a chiral ionic liquid, a liquid crystal, and a polymerizable monomer may be filled between the first transparent substrate and the second transparent substrate by a dropping process or an inkjet process. Curing with UV light is quick and easy and evenly cured.
  • the seal may seal the sides of the first transparent substrate and the second transparent substrate with a sealant, or may seal the PSCT layer by a combination of a seal strip and a sealant.
  • a transparent electrode is disposed on the opposite surfaces of the first transparent substrate and the second transparent substrate, and a voltage difference can be generated by applying different voltage values on the transparent electrodes on the first transparent substrate and the second transparent substrate, thereby changing The transmission or scattering state of the PSCT.
  • the method for fabricating the light guide plate of the embodiment has the advantages of a step tube, and realizes the advantage of the cartridge, and the light guide plate of the embodiment of the invention is transparent to the conventional light guide plate without applying voltage, after the voltage is applied.
  • a desired white background can be provided so that it can be used to prepare a transparent display device.
  • the light guide plate of the embodiment of the present invention plays a role of changing the light transmission direction of the conventional light guide plate by transmitting and scattering, thereby guiding the light, and providing a high transmittance and uniform light source for the transparent display device.
  • a light box having a large radiation area and a large volume is used, and the light guide plate of the embodiment of the invention has the advantages of small volume and light weight of the structure tube.
  • the backlight made by the light guide plate of the embodiment of the present invention has the advantages of high light transmittance and good uniformity during operation due to scattering of the polymer stabilized cholesteric material layer.
  • the transparent display device manufactured by the light guide plate of the embodiment of the invention has the advantages of small size, light weight, and convenient carrying, and satisfies the development trend of the current transparent display device, which is thinner, lighter, and portable.

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Abstract

一种导光板，包括相对设置的第一透明基板（1）与第二透明基板（2），第一透明基板（1）与第二透明基板（2）在相对面上均设有透明电极，且两透明基板之间设有高分子稳定胆留相材料层（3）。还提供该导光板的制作方法、背光源及透明显示装置，具有结构简单、制作使用方便、亮度均一的优点。

Description

导光板及其制作方法、 背光源及透明显示装置 技术领域
本发明的实施例涉及一种导光板及其制作方法、背光源及透明显示装置。 背景技术
透明显示装置在施加电压时在显示屏上显示图像， 在未施加电压时用户 透过显示屏可以看到显示屏背面的物体， 一般是高透过率的 LCD或 OLED 来制备透明显示器。
目前透明显示装置依靠位于显示屏上方的灯箱来提供显示图像所需光 线， 通常灯箱的体积大、 重量大， 无法制作出体积小， 便于携带的透明显示 器。 发明内容
本发明的实施例提供了一种可用于减小透明显示装置体积且透射率高的 导光板及其制作方法、 背光源及透明显示装置。
本发明的一个方面提供了一种导光板， 其包括相对设置的第一透明基板 与第二透明基板； 所述第一透明基板与所述第二透明基板在相对面上均设有 透明电极， 且两透明基板之间设有高分子稳定胆<甾相材料层。
例如， 所述高分子稳定胆 相材料层可以包括手性离子液体、 液晶以及 可聚合单体； 例如， 所述液晶可以为向列相液晶或近晶相液晶。
例如， 所述可聚合单体为丙烯酸酯或环氧树脂。
本发明的另一个方面提供了一种背光源， 包括如上所述的导光板以及与 所述导光板相适配的驱动装置。
例如， 该背光源还可以包括位于所述导光板侧面的光源以及位于所述导 光板与所述光源之间的隔热透明板。
例如， 所述隔热透明板可以为包括聚甲基丙烯酸甲酯的光学板。
例如， 该背光源还可以包括在所述光源未朝
设置的反射板。 本发明的另一个方面提供了一种透明显示装置，包括如上所述的背光源。 例如， 该透明显示装置还可以包括位于所述背光源出光侧的透明显示面 板。
例如， 所述显示面板可以包括显示区域， 所述导光板从背光源的出光侧 完全覆盖所述显示区域。
本发明的再一个方面提供了一种导光板的制作方法， 包括： 在第一透明 基板以及第二透明基板的相对面上均形成透明电极； 在所述第一透明基板与 所述第二透明基板之间形成高分子稳定胆 相材料层； 密封所述高分子稳定 胆甾相材料层。
例如， 在该制作方法中， 向所述第一透明基板与所述第二透明基板之间 填充手性离子液体、 液晶以及可聚合单体； 采用紫外线固化所述手性离子液 体、 液晶以及可聚合单体， 使所述液晶分子间形成高分子网络， 从而形成高 分子稳定胆 <甾相材料层。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 筒单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1为本发明实施例一所述的导光板的侧面结构示意图；
图 2为本发明实施例六所述的透明显示装置的侧面结构示意图； 图 3为图 2所述的透明显示装置的俯视剖面图；
具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图，对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
高分子稳定胆甾相材料 ( PSCT, Polymer Stabilized Cholesteric Texture ) 为在液晶中加入手性离子液体与可聚合单体的混合物。 在 PSCT固化以后， 液晶里形成有高分子网络， 从而实现电场控制的透射态和散射态。 PSCT在 直流电场作用下时， 由于手性离子液体向电极迁移， 出现焦锥织构， 呈散射 态。 PSCT在没施加电场时候， 呈透射状态。 所加电压不同， 手性离子液体 的扩散程度不同， 从而反射波宽也不同， 透过率也不同。 所以， 通过调节施 加到 PSCT的电场的强度， 可以调节负性液晶的透过率， 从而显示出任何颜 色。
实施例一
如图 1所示， 本实施例导光板包括相对设置的第一透明基板 1与第二透 明基板 2; 所述第一透明基板 1与所述第二透明基板 2在彼此相对的面 （内 表面）上均设有透明电极。 两透明基板 1、 2之间设有 PSCT层 3。
如图 1所示， 所述第一透明基板 1的下表面、 所述第二透明基板 2的上 表面均设有透明电极； 在工作时， 对透明基板 1、 2施加电压， 从而在所述第 一透明基板 1上的透明电极与第二透明基板 2上的透明电极之间产生电压差， 向所述 PSCT层 3施加电场， 由此改变 PSCT层的透过率， 实现光线的传导。 另外， 在未向所述透明电极施加电压或第一透明基板上透明电极与第二透明 基板上透明电极施加同样的电压值时， 即在二者之间不产生电压差， 没有电 场被施加在 PSCT层 3上， 所述 PSCT层 3呈透明状， 那么透过所述 PSCT 层 3可看见其导光板背后的物体。 此时， 导光板具有透光率高的优点。
例如， 所述透明电极可为 ITO (氧化铟锡） 电极、 IZO (氧化铟辞） 电 极等。 采用 ITO电极的方式具有技术成熟、 使用筒便、 取材方便等优点。
所述透明电极均可为一整体电极， 铺设在所述第一透明基板 1与第二透 明基板 2的相对面， 也可是由若干个小的透明导电单元构成的电极矩阵。 透 明电极的设置可根据需要进行配置。
本实施例所述的导光板， 在光源的配合下通过散射（如向透明显示装置 提供白色背景）提供亮度均一性好的背光， 在无需显示时通过透射保持良好 的透明性， 从而能取代传统的体积大、 面积大、 质量大的灯箱， 且具有体积 小， 结构紧凑灵巧， 易于携带的优点。
实施例二
本实施例导光板包括相对设置的第一透明基板与第二透明基板； 所述第 一透明基板与所述第二透明基板在相对面上均设有透明电极， 且两透明基板 之间设有 PSCT层。 通常所述 PSCT层包括手性离子液体、 液晶以及可聚合 单体； 在本实施例中， 所述液晶例如为向列相液晶或近晶相液晶。 选用向列 相液晶或近晶相液晶有利于提高光透过率。
作为对本实施例的进一步的改进， 所述可聚合单体优选为丙烯酸酯或环 氧树脂。 采用丙烯酸酯或环氧树脂， 进一步的有利于提高光透过率。
实施例三
本实施例背光源， 包括光源、 如实施例一或实施例二的导光板以及与所 述导光板相适配的驱动。
本实施例所述的背光源采用上述任一的导光板， 由于上述导光板是否呈 现散射状态以及散射状态的程度， 是由加在 PSCT层上下的电压决定的， 故 本实施例所述的背光源在采用了本发明所述的导光板的同时， 还配置了与本 发明所述的背光源相适配的驱动装置。
所述驱动装置可以是筒单的驱动电路， 可以是包括电源的驱动电路， 还 可以是包括外电源接入电路、变压器、控制器等电路连接而集成驱动电路等。 射状态， 从而为与其配合工作的显示屏提供白色背景与光源。
本实施例所述的背光源可以是侧入式背光（即光源设置在所述导光板的 侧面） ， 也可是直下式背光， 例如应用在非透明显示装置中， 如现有的液晶 电视、 平板电脑、 电子书等显示装置中。 应用在非透明显示装置的背光源中 的导光板在显示装置工作时施加电压， 呈现散射状态， 为显示装置提供均一 性良好的背光源。
实施例四
本实施例背光源， 包括光源、 如实施例一或实施例二任一所述的导光板 以及与所述导光板相适配的驱动装置。
所述光源可以是 CCFL (冷阴极灯管）或 LED (发光二级管） ； 所述光 源可以位于所述导光板的侧面， 且在所述导光板与所述光源之间设有隔热透 明板。 光源在工作时易形成高温， 温度过高或高温持续时间过长， 将导致 PSCT层中的液晶失去液晶相而变成各向同性， 从而导致 PSCT层的工作不 良。 为了解决上述问题， 在本实施例中引入了透明隔热板， 透明隔热板防止 了光源的热直接向所述导光板传导， 同时采用透明板有利于光源发出的光线 的传输， 保持良好的光透过率。
作为本实施例进一步的改进， 所述隔热透明板可以为包括聚甲基丙烯酸 甲酯（PMMA )的光学板。 PMMA俗称有机玻璃， 是传统的导光板的主要材 质。 采用包括 PMMA的光学板， 可以尽可能的将光源射出的光线向本发明 所述的导光板传递， 从而保证了较高的光源利用率。
实施例五
本实施例在实施例三或实施例四的基础上， 做出了进一步的改进， 在所 述光源未朝向所述导光板的出光侧 （即光线发散方向）可以均设有反射板。
如所述光源为 LED 光源时， LED 光源包括灯条以及固定在灯条上的
LED。 LED背离所述灯条方向为其光线发散的方向。 当 LED位于所述导光 板侧面的时候， 即与所述导光板位于同一水平面时， 其上下两个侧面就会形 成漏光，从而降低了光源的有效利用率。故为了保证光源的光的有效利用率， 在光源未朝向所述导光板的光线发散侧均设置反射板， 通过反射板将光源反 射回光源处， 并最终从所述导光板向外传导。
所述反射板可以是每个方向上的单独设置的多块分离的反射板， 也可以 相互连接形成反射弧面或曲面。 尤其是当所述光源为 CCFL时可以采用一侧 开口的反射弧面， 所述开口与所述导光板相对设置。
综合上述，本发明实施例的背光源，在未向导光板施加电压时呈透明状， 施加电压后开启光源可以提供白色背景，用于组成透明装置时，具有体积小， 质量轻， 便于携带的优点， 且其本身具有结构筒单， 制作使用方便的优点。
实施例六
本实施例透明显示装置， 包括如实施例三至实施例五任一所述的背光源 和透明显示面板。
如图 2-图 3所示， 所示背光源包括导光板 12、 位于导光板侧面的光源
13 (例如， 所述光源由若干 LED组成） 、 位于光源 13上下两个侧面防止光 线泄露的反射板 151、 152以及透明隔热板 14。 透明显示面板 11设置在背光 源的出光侧。
本实施例所述的透明显示装置， 采用本发明实施例的背光源， 不是使用 传统的灯箱， 因此具有结构筒单、 体积小、 质量轻便于携带的优点。 实施例七
本实施例在上一实施例的基础上， 进行了进一步的改进， 所述显示面板
11位于所述背光源的出光侧。
所述透明显示面板 11从上至下依次包括上偏光板、上透明基板、液晶层、 下透明基板以及下偏光板； 所述上偏光板与所述下偏光板之间的偏振角度相 差 90。； 所述上透明基板与所述下透明基板的相对面均设有透明电极； 在显 示屏工作时， 向上下透明基板上的透明电极施加不同的电压使相对的透明电 极之间产生电压差， 从而可以驱动液晶层呈现不同工作状态。
所述上透明基板下表面还可以依次间隔分布有多种不同颜色的透明彩 膜。 通常， 不同颜色的透明彩膜为红 /绿 /蓝（R/G/B )三色透明彩膜， 通过三 种原色的混合可以在显示时形成任意颜色的显示图案。 例如， 所述三色透明 彩膜还可以设置在所述下透明基板上。 当然， 不同颜色的透明彩膜可不仅限 于 R/G/B透明彩膜， 而是根据生产或者设计的需要， 还可以为其他颜色或包 括其他颜色例如透明色、 黄色等透明彩膜。
进一步地， 所述显示面板包括显示区域， 所述导光板从背光源的出光面 完全覆盖所述显示区域， 即所述导光板的面积不小于所述显示区域的面积， 由此可以完全覆盖住了所述显示区域， 这样就能保证显示区域的任何一点均 在显示时接收到来自导光板的光线。
综合上述本发明实施例的透明显示装置， 采用了本发明实施例的导光板 及背光源，在不工作状态下保持了透明显示装置的透明特性，在工作状态下， 采用所述背光源提供背光， 具有光透过率高，从而具有亮度高、显示效果佳， 均一性好的优点， 且体积小、 质量小、 结构筒单且便于携带。
实施例八
如图 4所示， 本实施例提供了一种导光板的制作方法， 可以如下进行。 首先， 提供第一和第二透明 反， 在第一透明_¾反以及第二透明 _¾:反的相 对面上均形成透明电极。 第一和第二透明基板可以为玻璃基板、 塑料基板等。
在第一透明基板以及第二透明基板的相对面上形成透明电极， 可以采用 常规的成熟工艺。 若透明电极为一整层无图案结构， 例如可以将用于制作透 明电极的透明导电材料例如 ΙΤΟ、 ΙΖΟ等直接采用沉积、 涂覆、 溅射等方式 形成电极层即可； 若透明电极为图案化结构， 可以将用于制作透明电极的透 明导电材料例如 ITO、 ΙΖΟ等采用构图工艺形成要求的图案。 构图工艺通常 包括光刻胶涂覆、 曝光、 显影、 刻蚀、 光刻胶剥离等工艺。
其次， 在所述第一透明基板与所述第二透明基板之间形成 PSCT层。 在一个示例中， 为了形成该 PSCT层， 可以先向所述第一透明基板与所 述第二透明基板之间填充手性离子液体、 液晶以及可聚合单体； 然后， 采用 紫外线固化所述手性离子液体、 液晶以及可聚合单体， 使所述液晶分子间形 成高分子网络， 从而形成 PSCT层。 例如， 可以采用滴注工艺或者喷墨工艺 将手性离子液体、 液晶以及可聚合单体填充到第一透明基板与所述第二透明 基板之间。 采用紫外线进行固化， 快速便捷且固化均匀。
之后， 密封所述 PSCT层。 所述密封可以采用框胶对所述第一透明基板 与第二透明基板的侧面进行密封， 也可以采用密封条与密封胶的组合方式对 所述 PSCT层进行密封。 所述第一透明基板与所述第二透明基板的相对面上 均设有透明电极， 通过在第一透明基板与第二透明基板上的透明电极施加不 同电压值从而可以产生电压差， 从而改变 PSCT的透射或散射状态。
本实施例的导光板的制作方法， 具有步骤筒便， 实现筒单的优点， 且制 本发明实施例的导光板相对于传统的导光板， 在未施加电压呈透明状， 在施加了电压后可以提供所需的白色背景，从而可以用于制备透明显示装置。
而且， 本发明实施例的导光板， 通过透射和散射在施加电压时起到了传 统导光板的改变光线传输方向的作用， 进而引导光线， 为透明显示装置提供 高透射率且均勾性好的光源； 相对于传统的透明显示装置为了保证光源的均 一性而采用辐射面积大、体积大的灯箱，本发明实施例的导光板具有体积小、 结构筒单轻便的优点。
采用本发明实施例的导光板制作的背光源， 由于高分子稳定胆甾相材料 层的散射， 在工作时具有光透过率高， 均一性好的优点。
综合上述， 由本发明实施例的导光板所制作的透明显示装置， 具有体积 小、 重量轻， 携带方便， 满足了现在透明显示装置， 薄型化、 轻量化以及便 携化的发展趋势。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种导光板， 包括相对设置的第一透明基板与第二透明基板； 其中， 所述第一透明基板与所述第二透明基板在相对面上均设有透明电极， 且两透 明基板之间设有高分子稳定胆甾相材料层。
2、根据权利要求 1所述的导光板， 其中， 所述高分子稳定胆甾相材料层 包括手性离子液体、 液晶以及可聚合单体； 所述液晶为向列相液晶或近晶相 液晶。
3、根据权利要求 1或 2所述的导光板， 其中， 所述可聚合单体为丙烯酸 酯或环氧树脂。
4、一种背光源， 包括如权利要求 1-3任一所述的导光板以及与所述导光 板相适配的驱动装置。
5、根据权利要求 4所述的背光源，还包括位于所述导光板侧面的光源以 及位于所述导光板与所述光源之间的隔热透明板。
6、根据权利要求 5所述的背光源， 其中， 所述隔热透明板为包括聚甲基 丙烯酸甲酯的光学板。
7、根据权利要求 5或 6所述的背光源，还包括在所述光源未朝向所述导 光板的出光侧设置的反射板。
8、 一种透明显示装置， 包括如权利要求 4-7任一所述的背光源。
9、根据权利要求 8所述的透明显示装置，还包括位于所述背光源出光侧 的透明显示面板。
10、 根据权利要求 9所述的透明显示装置， 其中， 所述显示面板包括显 示区域， 所述导光板从背光源的出光侧完全覆盖所述显示区域。
11、 一种导光板的制作方法， 包括：
在第一透明基板以及第二透明基板的相对面上均形成透明电极； 在所述第一透明基板与所述第二透明基板之间形成高分子稳定胆 相材 料层；
密封所述高分子稳定胆 相材料层。
12、根据权利要求 11所述的导光板的制作方法， 其中， 向所述第一透明 基板与所述第二透明基板之间填充手性离子液体、 液晶以及可聚合单体； 采 用紫外线固化所述手性离子液体、 液晶以及可聚合单体， 使所述液晶分子间 形成高分子网络， 从而形成高分子稳定胆<甾相材料层。
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