WO2015154413A1 - 一种单向透光膜、光收集器和背光源模组 - Google Patents

一种单向透光膜、光收集器和背光源模组 Download PDF

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Publication number
WO2015154413A1
WO2015154413A1 PCT/CN2014/088903 CN2014088903W WO2015154413A1 WO 2015154413 A1 WO2015154413 A1 WO 2015154413A1 CN 2014088903 W CN2014088903 W CN 2014088903W WO 2015154413 A1 WO2015154413 A1 WO 2015154413A1
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light
backlight
unidirectional
transparent
transmissive film
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PCT/CN2014/088903
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English (en)
French (fr)
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韩正渭
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中兴通讯股份有限公司
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Publication of WO2015154413A1 publication Critical patent/WO2015154413A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses

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  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a unidirectional light transmissive film, a light collector and a backlight module using the unidirectional light transmissive film.
  • color liquid crystal displays are widely used.
  • the commonly used color LCD screen is transmissive, the screen itself does not actively emit light, and a backlight is required to use.
  • the energy consumed by the backlight generally accounts for more than half of the power consumption of the screen, especially in the outdoor.
  • the display brightness must be adjusted to a high degree to provide suitable visibility.
  • the design difficulty of the backlight also increases the power consumption of the backlight, resulting in a sharp decrease in the life time of the product.
  • the technical problem to be solved by the present invention is to provide a unidirectional transparent film, a light collector and a backlight module, which can improve the backlight brightness of the transmissive liquid crystal screen without increasing the power consumption of the backlight, and enhance the outdoor strong. Screen visibility under light.
  • a unidirectional light transmissive film comprising: a transparent substrate, the transparent substrate comprising an upper surface and a lower surface;
  • the upper surface of the transparent substrate is covered with a microlens array, and the microlens in the microlens array Is a convex lens;
  • the lower surface of the transparent substrate is covered with a reflective material layer, and the reflective material layer is disposed to reflect light incident from under the unidirectional transparent film, the reflective material layer corresponding to the center of each microlens A transparent window is opened, and light incident from above the unidirectional light-transmissive film converges in the transparent window and passes through the reflective material layer.
  • the unidirectional transparent film further comprises the following features:
  • Each of the transparent windows is located on a focal plane of the corresponding microlens.
  • the unidirectional transparent film further comprises the following features:
  • the shape of the microlens is a circle, a square or a regular hexagon.
  • the unidirectional transparent film further comprises the following features:
  • microlens arrays are densely arranged, and adjacent microlenses are in contact with each other.
  • the unidirectional transparent film further comprises the following features:
  • the area of the transparent window is less than 1/3 of the light-passing area of the corresponding microlens.
  • the unidirectional transparent film further comprises the following features:
  • the unidirectional light transmissive film is a soft film or a hard film.
  • a light collector comprising a transparent body
  • the top surface of the transparent body covers the unidirectional light transmissive film, and the other surface of the transparent body is covered with a reflective material layer with a reflective inner surface except one side.
  • the light collector further includes the following features:
  • the transparent body is a rectangular parallelepiped.
  • a light collector comprising a box body
  • the top surface of the box body is the unidirectional light transmissive film, or the top surface of the box body is covered with the unidirectional light transmissive film;
  • One side of the box body is a transparent illumination window, and the other side surfaces of the box body and the inner wall of the bottom surface are covered Reflective inward facing layer of reflective material.
  • the light collector further includes the following features:
  • the inside of the box is air or other transparent medium.
  • a backlight module includes a backlight, the backlight includes a backlight diffusion plate, and the backlight diffusion plate is configured to: scatter side light to uniformly illuminate the liquid crystal display, the backlight module further includes a light collector, a side of the light collector not covering the reflective material layer is in contact with a side surface of the backlight diffusion plate;
  • the light collector is configured to collect ambient light and introduce the collected ambient light into a lateral direction of the backlight diffusion plate.
  • a backlight module includes a backlight, the backlight includes a backlight diffusion plate, and the backlight diffusion plate is configured to: scatter side light to uniformly illuminate the liquid crystal display, the backlight module further includes a light collector, a side where the illumination window of the light collector is located is in contact with a side surface of the backlight diffusion plate;
  • the light collector is configured to collect ambient light and introduce the collected ambient light into a lateral direction of the backlight diffusion plate.
  • the unidirectional transparent film, the light collector and the backlight module provided by the embodiments of the present invention, the unidirectional transparent film (unidirectional transmission-unidirectional reflection film) fabricated by the microlens technology , allowing most of the light from above (transmissive side) of the unidirectional light-transmissive film to penetrate itself, and reflecting most of the light from below (reflecting side) of the unidirectional light-transmissive film, using the one-way
  • the light collector made of the transparent film can collect ambient light and emit from the transparent illumination window on the side of the light collector, and integrates the backlight module of the light collector, and can collect ambient light by using the light collector and introduce the backlight diffusion plate.
  • the backlight module can improve the backlight brightness of the transmissive liquid crystal screen without increasing the power consumption of the backlight, and improve the screen visibility under outdoor strong light.
  • FIG. 1 is a longitudinal cross-sectional view of a unidirectional light transmissive film according to an embodiment of the present invention
  • FIG. 2 is a top perspective view of a unidirectional light transmissive film according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an optical path of a unidirectional transparent film according to an embodiment of the present invention.
  • FIG. 4 is a perspective view of a light collector according to an embodiment of the present invention.
  • FIG. 5 is a schematic longitudinal cross-sectional view of a backlight module according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a terminal of a liquid crystal display with ambient light collection function according to an embodiment of the present invention.
  • a lens is a common optical component.
  • people have been able to produce lenses and lens arrays with very small diameters.
  • Such lenses and lens arrays are usually not recognized by the human eye. They can only be observed by microscopes, scanning electron microscopes, atomic force microscopes, etc. This is the microlens. And microlens arrays. These microlens arrays are widely used in various technical fields such as lasers, optoelectronics, and image sensors.
  • the invention discloses a unidirectional transmission-unidirectional reflection film fabricated by using a microlens technology, which can allow most of the light from one side (transmission side) to penetrate itself and the other side (reflection side) The light is mostly reflected back.
  • an embodiment of the present invention provides a unidirectional light transmissive film, comprising: a transparent substrate 10 including an upper surface and a lower surface;
  • the upper surface of the transparent substrate 10 is covered with a microlens array, and the microlens 20 in the microlens array is a convex lens;
  • the lower surface of the transparent substrate is covered with a reflective material layer 30, and the reflective material layer 30 is disposed to reflect light incident from under the unidirectional transparent film, the reflective material layer 30 and each microlens 20
  • the corresponding position of the center is opened with a transparent window 40, the light incident from above the unidirectional transparent film converges in the transparent window 40 and passes through the reflective material layer 30;
  • the upper surface of the transparent substrate refers to a surface covered with a microlens array
  • the lower surface of the transparent substrate refers to a surface covered with a layer of the reflective material.
  • the upper and lower surfaces are distinguished for convenience of description and should not be considered as limiting the direction in which the unidirectional light-transmissive film is used.
  • each of the transparent windows is located on a focal plane of the corresponding microlens.
  • the shape of the microlens is not limited, and is generally circular, square or regular hexagon.
  • the microlens arrays are densely arranged, and adjacent microlenses are in contact with each other. If the shape of the microlens is circular, adjacent microlenses are tangent to each other. If the shape of the microlenses is square or regular hexagon, one side is shared between adjacent microlenses.
  • the area of the transparent window is less than 1/3 of the light-passing area of the corresponding microlens.
  • the shape of the microlens and the transparent window are both circular, the diameter of the microlens is 200 um, and the diameter of the transparent window is 40 um, and the area of the transparent window is 1/25 of the light-passing area of the microlens.
  • the unidirectional light transmissive film is a soft film or a hard film.
  • the unidirectional transmission-unidirectional reflection film includes a transparent substrate 10 on the upper surface of which is a densely arranged microlens array, and these microlenses 20 are convex lenses.
  • the shape of these convex lenses is not limited, but is generally circular, square or regular hexagon.
  • the lower surface of the transparent substrate 10 is covered with a layer of high reflective material 30, and the high light reflecting material has a high reflectance.
  • a transparent small window 40 is formed on the highly reflective material layer 30 at a position corresponding to the center of the microlens. These small windows 40 are located on the focal plane of the microlens and are capable of concentrating light incident in the vertical direction within the small window 40 and through the layer of reflective material 30.
  • FIG. 3 is a schematic diagram of the optical path of the unidirectional transmission-unidirectional reflection film, taking a single microlens and a transparent small window as an example, when light is incident from above (transmission side) of the unidirectional transmission-unidirectional reflection film, most of The light is concentrated by the convex lens and passes through the transparent substrate 10 to be emitted from the transparent small window 40 of the reflective material layer 30.
  • light is incident from below (reflecting side) of the unidirectional transmission-unidirectional reflection film, since most of the lower surface of the transparent substrate 10 is covered with a highly reflective material, most of the light is reflected back.
  • an embodiment of the present invention provides a light collector, including a transparent body.
  • the top surface of the transparent body covers the unidirectional light transmissive film, and the transparent body has one surface except the other side
  • the faces are covered with a layer of reflective material that is reflective inward.
  • the shape of the transparent body is not limited and is generally a rectangular parallelepiped.
  • the side surface of the transparent body that is not covered with the reflective material layer serves as a transparent illumination window.
  • the embodiment of the invention further provides a light collector, comprising a box body,
  • the top surface of the box body is a unidirectional light transmissive film, or the top surface of the box body is covered with a unidirectional light transmissive film;
  • One side of the box body is a transparent illumination window, and the other side surfaces of the box body and the inner wall of the bottom surface are covered with a layer of reflective material facing the inner surface.
  • the inside of the box is air or other transparent medium.
  • the working principle of the light collector is: after the ambient light from above the light collector passes through the unidirectional light-transmissive film and enters the light collector, the light can no longer be unidirectional due to the unidirectional light transmission property of the unidirectional light-transmissive film. It is emitted outside the light collector and can only be repeatedly reflected inside the light collector and finally emitted from the transparent illumination window on one side.
  • an embodiment of the present invention provides a backlight module, including a backlight, the backlight includes a backlight diffusion plate, and the backlight diffusion plate is configured to: scatter side light to uniformly illuminate
  • the liquid crystal display further includes: a light collector, a side of the light collector not covering the reflective material layer is in contact with a side surface of the backlight diffusion plate;
  • the light collector is configured to collect ambient light and introduce the collected ambient light into a lateral direction of the backlight diffusion plate.
  • the light collector comprises a transparent body, and a top surface of the transparent body covers the unidirectional light transmissive film, and the transparent body is covered with a reflective material layer with a reflective inner surface except one side.
  • the backlight module may include one or more light collectors, and a side of the transparent collector window of each of the light collectors is in contact with one side of the backlight.
  • an embodiment of the present invention further provides a backlight module, including a backlight, the backlight includes a backlight diffusion plate, and the backlight diffusion plate is configured to: scatter side light To uniformly illuminate the liquid crystal display, further comprising: a light collector, the side of the illumination window where the illumination window is located is in contact with the side surface of the backlight diffusion plate;
  • the light collector is configured to collect ambient light and introduce the collected ambient light into a lateral direction of the backlight diffusion plate.
  • the light collector comprises a box body, the top surface of the box body is a unidirectional light transmissive film, or the top surface of the box body is covered with a unidirectional light transmissive film; the side of the box body is transparent The illumination window, the other side of the case and the inner wall of the bottom surface are covered with a layer of reflective material facing the inner surface.
  • the backlight module may include one or more light collectors, and a side of the transparent collector window of each of the light collectors is in contact with one side of the backlight.
  • the upper shaded area on the right side of FIG. 5 is an LCD screen, and the backlight of the LCD screen is a backlight.
  • the backlight includes a backlight diffusion plate, and is arranged to scatter lateral light to uniformly illuminate the screen.
  • the left side of Figure 5 is a light collector unique to the present invention.
  • the upper surface of the light collector is covered with the above-described one-way transmission-unidirectional reflection film, and the lower portion of the film is an inner transparent cavity.
  • On the right side of the cavity is a transparent illumination window, and the remaining surfaces are total reflection surfaces.
  • the backlight module passes the ambient light from above into the cavity through the unidirectional transparent film.
  • the light can no longer be emitted to the outside, and can only be repeated by the inner wall of the cavity. Reflected and eventually ejected from the right side of the cavity to the backlight diffuser, illuminating the LCD screen.
  • the backlight module directly collects ambient light and is introduced into the backlight side of the transmissive liquid crystal panel to enhance the backlight intensity.
  • the backlight does not consume any power, and can automatically increase the backlight intensity as the ambient light increases, improving the display of the screen.
  • FIG. 6 is a schematic diagram of a tablet computer with an LCD display.
  • a light collector is installed on one side of the LCD display to collect ambient light and increase the ambient light collection function.
  • the LCD screen display under the outdoor strong light is far more than the traditional equipment, has a strong practical value.
  • the light collector is a rectangular parallelepiped glass
  • the upper surface is covered with a unidirectional light transmissive film
  • the diameter of the microlens on the unidirectional light transmissive film is 200 um
  • the diameter of the transparent window (circular) on the unidirectional light transmissive film is 40 um.
  • the reflectance of the reflective material on the reflective side of the unidirectional light-transmissive film is 90%
  • the absorbance of the microlens medium on the transmission side of the unidirectional light-transmissive film is 10%
  • the reflectance of the surface of the microlens is 10%
  • the microlens Optical path loss is 10%;
  • the upper surface of the light collector has an area of 10 cm * 5 cm, a thickness of 0.5 cm, and an ambient light of 100,000 lux (equivalent to direct sunlight at noon);
  • the luminous flux projected from the upper surface is:
  • Ambient light passes through the unidirectional light transmissive film, and the luminous flux entering the interior of the light collector is:
  • Light entering the interior of the light collector is absorbed by the glass and is emitted from a transparent illumination window on one side.
  • One side of the light collector (area 10cm*0.5cm) is a transparent illumination window, the transmittance of the transparent window is 90%, the reflectance is 10%, and the macroscopic reflectance of the reflection side of the unidirectional transparent film is known to be 86%, the total absorption surface of the light collector has a dielectric absorption rate of 10% and a reflectance of 90%;
  • the luminous flux absorbed by each surface inside the light collector is:
  • the luminous flux absorbed by each surface inside the light collector is: 0.0007*x+0.0005*x+0.00045*x+0.0001*x
  • the illuminance inside the light collector is 208,571 lux, it is far more than twice the illuminance of the external environment.
  • the luminous flux through the transparent illumination window is:
  • the screen brightness has increased by 2,694 nits.
  • the brightness of the screen backlight is only about 500 nanometers, and the increased brightness is very large compared to the original backlight.
  • the list is compared as follows:
  • the liquid crystal display with ambient light collection function under direct sunlight, the brightness of the backlight is more than six times that of the ordinary screen, and the contrast is improved by 130%. Therefore, the visibility of the screen is greatly improved.
  • the unidirectional transparent film, the light collector and the backlight module provided by the above embodiments, the unidirectional transparent film (unidirectional transmission-unidirectional reflection film) fabricated by the microlens technology can be derived from the one-way Most of the light above the transmissive film (transmission side) penetrates itself, and most of the light from under the unidirectional light-transmissive film (reflecting side) is reflected back, and light collection by the unidirectional light-transmissive film is used.
  • the device collects ambient light and emits it from a transparent illumination window on the side of the light collector.
  • the backlight module of the light collector is integrated, and the light collector can be used to collect ambient light and introduce the backlight diffusion plate to illuminate the liquid crystal display.
  • the backlight module can improve the backlight brightness of the transmissive liquid crystal screen without increasing the power consumption of the backlight, and improve the screen visibility under outdoor strong light.
  • the unidirectional light transmissive film (unidirectional transmission-unidirectional reflection film) fabricated by the microlens technology can be obtained from the single Most of the light rays above the light transmissive film (transmission side) penetrate themselves, and most of the light rays from the underside (reflecting side) of the unidirectional light transmissive film are reflected back, and the light produced by the unidirectional light transmissive film is used.
  • the collector is capable of collecting ambient light and ejecting from a transparent illumination window on the side of the light collector, integrating the backlight module of the light collector, and collecting the ambient light by using the light collector and introducing the backlight diffusion plate to illuminate the liquid crystal display. Therefore, the backlight module can improve the backlight brightness of the transmissive liquid crystal screen without increasing the power consumption of the backlight, and improve the screen visibility under outdoor strong light. Therefore, the present invention has strong industrial applicability.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

一种单向透光膜，包括一具有上表面和下表面的透明基板(10)。透明基板(10)的上表面覆盖有微透镜阵列，微透镜阵列中的微透镜(20)是凸透镜，透明基板(10)的下表面覆盖有反光材料层(30)。反光材料层(30)反射从单向透光膜下方入射的光，反光材料层(30)与每一微透镜(20)的中心相对应的位置开有透明窗(40)，从单向透光膜上方入射的光汇聚于透明窗(40)内并穿过反光材料层(30)。还公开了一种利用单向透光膜制作的光收集器，以及集成了光收集器的背光源模组。

Description

一种单向透光膜、光收集器和背光源模组 技术领域
本发明涉及液晶显示屏技术领域，尤其涉及的是一种单向透光膜、利用所述单向透光膜的光收集器和背光源模组。
背景技术
随着移动终端的快速发展，彩色液晶显示屏被大量使用。常用的彩色液晶显示屏是透射式的，屏幕自身不主动发光，需要一个背光源才能使用。但该背光源消耗的能量一般占屏幕耗电的一半以上，尤其在户外，为了避免环境光在屏幕上的反射降低显示效果，必须将屏幕亮度调节到很高才能提供合适的可视度，增加了背光源的设计难度，也增加了背光的功耗，导致产品的续航时间急剧降低。
曾有公司尝试过反射式以及半透射半反射式的液晶显示屏(LCD，Liquid Crystal Display)以降低背光功耗，但此类背光技术会导致屏幕的色彩饱和度低，对比度差等显示效果不佳的问题，仅适用于特别强调低功耗而不在意视觉效果的一些场合，如电子手表等。在对视觉效果要求较高的场合，如手机、平板电脑等领域，此类背光技术因为先天缺陷，并未得到推广使用。
因此，如何在不增加背光功耗的前提下，提高透射式液晶屏的背光亮度，提升在户外强光下的屏幕可视度，是个很有意义的课题。
发明内容
本发明所要解决的技术问题是提供一种单向透光膜、光收集器和背光源模组，能够在不增加背光功耗的前提下，提高透射式液晶屏的背光亮度，提升在户外强光下的屏幕可视度。
为了解决上述技术问题，采用如下技术方案：
一种单向透光膜，包括：一透明基板，该透明基板包括上表面和下表面；
所述透明基板的上表面覆盖有微透镜阵列，所述微透镜阵列中的微透镜 是凸透镜；
所述透明基板的下表面覆盖有反光材料层，所述反光材料层设置成：反射从所述单向透光膜下方入射的光，所述反光材料层与每一微透镜的中心相对应的位置开有透明窗，从所述单向透光膜上方入射的光汇聚于所述透明窗内并穿过所述反光材料层。
可选地，该单向透光膜还包括下述特点：
每一个透明窗位于对应微透镜的焦平面上。
可选地，该单向透光膜还包括下述特点：
所述微透镜的形状为圆形、正方形或正六边形。
可选地，该单向透光膜还包括下述特点：
所述微透镜阵列密集排列，相邻的微透镜之间相接。
可选地，该单向透光膜还包括下述特点：
所述透明窗的面积小于对应微透镜通光面积的1/3。
可选地，该单向透光膜还包括下述特点：
所述单向透光膜为软膜或硬膜。
一种光收集器，包括透明体，
所述透明体的顶面覆盖上述单向透光膜，所述透明体除一个侧面外，其他表面均覆盖有反光面向内的反光材料层。
可选地，该光收集器还包括下述特点：
所述透明体是长方体。
一种光收集器，包括一盒体，
所述盒体的顶面为上述单向透光膜，或者所述盒体的顶面覆盖有上述单向透光膜；
所述盒体一侧为透明的照射窗，所述盒体的其他侧面和底面的内壁覆盖 有反光面向内的反光材料层。
可选地，该光收集器还包括下述特点：
所述盒体内部是空气或其他透明介质。
一种背光源模组，包括背光源，所述背光源包括一背光扩散板，所述背光扩散板设置成：对侧向来光进行散射以均匀照亮液晶显示屏，该背光源模组还包括：光收集器，所述光收集器的未覆盖反光材料层的侧面与所述背光扩散板的侧面相接；
所述光收集器，设置成：收集环境光，将收集到的环境光导入所述背光扩散板的侧向。
一种背光源模组，包括背光源，所述背光源包括一背光扩散板，所述背光扩散板设置成：对侧向来光进行散射以均匀照亮液晶显示屏，该背光源模组还包括：光收集器，所述光收集器的照射窗所在的侧面与所述背光扩散板的侧面相接；
所述光收集器，设置成：收集环境光，将收集到的环境光导入所述背光扩散板的侧向。
与相关技术相比，本发明实施例提供的一种单向透光膜、光收集器和背光源模组，利用微透镜技术制作的单向透光膜(单向透射-单向反射膜)，能够让来自于单向透光膜上方(透射侧)的光线的大部分穿透自身，而将来自于单向透光膜下方(反射侧)的光线的大部分反射回去，利用该单向透光膜制作的光收集器能够收集环境光并从光收集器侧面的透明照射窗射出，集成了该光收集器的背光源模组，能够利用光收集器收集环境光并导入背光扩散板，照亮液晶显示屏，因此所述背光源模组能够在不增加背光功耗的前提下，提高透射式液晶屏的背光亮度，提升在户外强光下的屏幕可视度。
附图概述
图1为本发明实施例的单向透光膜的纵向剖面图；
图2为本发明实施例的单向透光膜的俯视透视图；
图3为本发明实施例的单向透光膜的光路原理图；
图4为本发明实施例的光收集器的立体图示意；
图5为本发明实施例的背光源模组的纵向剖面示意图；
图6为本发明实施例的带环境光收集功能的液晶显示屏的终端示意图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
透镜是一种常见的光学元件。近年，人们已经能够制作出直径非常小的透镜与透镜阵列，这种透镜与透镜阵列通常是不能被人眼识别的，只有用显微镜、扫描电镜、原子力显微镜等设备才能观察到，这就是微透镜和微透镜阵列。这些微透镜阵列被广泛地应用在激光、光电子、图像传感器等各个技术领域。
本发明公开了一种利用微透镜技术制作的单向透射-单向反射膜，能够让来自于一侧(透射侧)的光线的大部分穿透自身，而将来自于另一侧(反射侧)的光线大部分反射回去。
如图1所示，本发明实施例提供了一种单向透光膜，包括：一透明基板10，包括上表面和下表面；
所述透明基板10的上表面覆盖有微透镜阵列，所述微透镜阵列中的微透镜20是凸透镜；
所述透明基板的下表面覆盖有反光材料层30，所述反光材料层30设置成：反射从所述单向透光膜下方入射的光，所述反光材料层30与每一微透镜20的中心相对应的位置开有透明窗40，从所述单向透光膜上方入射的光汇聚于所述透明窗40内并穿过所述反光材料层30；
其中，所述透明基板的上表面是指覆盖有微透镜阵列的一个表面，所述 透明基板的下表面是指覆盖有反光材料层的一个表面。区分上、下表面是为了方便描述，不应该被认为是对单向透光膜使用时的方向进行限制。
优选地，每一个透明窗位于对应微透镜的焦平面上。
其中，所述微透镜的形状不限，一般为圆形、正方形或正六边形。
优选地，所述微透镜阵列密集排列，相邻的微透镜之间相接。如所述微透镜的形状为圆形，则相邻的微透镜之间相切，如所述微透镜的形状为正方形或正六边形，则相邻的微透镜之间共用一侧边。
优选地，所述透明窗的面积小于对应微透镜通光面积的1/3。比如，微透镜和透明窗的形状均为圆形，微透镜直径是200um，透明窗直径是40um，则所述透明窗的面积是所述微透镜通光面积的1/25。
其中，所述单向透光膜为软膜或硬膜。
图1和图2是该单向透光膜(单向透射-单向反射膜)的原理示意图，其中图1是纵向的剖面图，图2是俯视的透视图。从结构上看，本单向透射-单向反射膜包括一透明基板10，在所述透明基板10的上表面是密集排列的微透镜阵列，这些微透镜20是凸透镜。这些凸透镜的形状不限，但一般是圆形、正方形或者正六边形。在所述透明基板10的下表面覆盖一层高反光材料层30，高反光材料的反光率很高。在高反光材料层30上对应于微透镜中心的位置上开有透明的小窗40。这些小窗40位于微透镜的焦平面上，能够让垂直方向入射的光线汇聚于小窗40内并穿过反光材料层30。
图3是该单向透射-单向反射膜的光路原理图，以单个微透镜和透明小窗为例，当光线从单向透射-单向反射膜的上方(透射侧)入射时，大部分光线被凸透镜汇聚，并穿过透明基板10，从反光材料层30的透明小窗40射出。当光线从单向透射-单向反射膜的下方(反射侧)入射时，由于透明基板10的下表面绝大多数面积上都覆盖有高反光材料，所以大多数光线会被反射回去。
如图4所示，本发明实施例提供了一种光收集器，包括透明体，
所述透明体的顶面覆盖单向透光膜，所述透明体除一个侧面外，其他表 面均覆盖有反光面向内的反光材料层。
其中，所述透明体的形状不限，一般为长方体。
其中，所述透明体的未覆盖反光材料层的侧面作为透明的照射窗。
本发明实施例还提供了一种光收集器，包括一盒体，
所述盒体的顶面为单向透光膜，或者所述盒体的顶面覆盖有单向透光膜；
所述盒体一侧为透明的照射窗，所述盒体的其他侧面和底面的内壁覆盖有反光面向内的反光材料层。
其中，所述盒体内部是空气或其他透明介质。
所述光收集器的工作原理是：来自于光收集器上方的环境光，穿过单向透光膜进入光收集器内部后，由于单向透光膜的单向透光特性，光线无法再射出到光收集器外部，只能在光收集器内部反复反射，并最终从一侧的透明照射窗射出。
如图5所示，本发明实施例提供了一种背光源模组，包括背光源，所述背光源包括一背光扩散板，所述背光扩散板设置成：对侧向来光进行散射以均匀照亮液晶显示屏，还包括：一光收集器，所述光收集器的未覆盖反光材料层的侧面与所述背光扩散板的侧面相接；
所述光收集器，设置成：收集环境光，将收集到的环境光导入所述背光扩散板的侧向。
其中，所述光收集器包括透明体，所述透明体的顶面覆盖上述单向透光膜，所述透明体除一个侧面外，其他表面均覆盖有反光面向内的反光材料层。
其中，所述背光源模组可以包括一个或多个光收集器，每一个光收集器的透明照射窗所在的侧面与所述背光源的一个侧面相接。
如图5所示，本发明实施例还提供了一种背光源模组，包括背光源，所述背光源包括一背光扩散板，所述背光扩散板设置成：对侧向来光进行散射 以均匀照亮液晶显示屏，还包括：一光收集器，所述光收集器的照射窗所在的侧面与所述背光扩散板的侧面相接；
所述光收集器，设置成：收集环境光，将收集到的环境光导入所述背光扩散板的侧向。
其中，所述光收集器包括一盒体，所述盒体的顶面为单向透光膜，或者所述盒体的顶面覆盖有单向透光膜；所述盒体一侧为透明的照射窗，所述盒体的其他侧面和底面的内壁覆盖有反光面向内的反光材料层。
其中，所述背光源模组可以包括一个或多个光收集器，每一个光收集器的透明照射窗所在的侧面与所述背光源的一个侧面相接。
如图5所示，图5右侧上方阴影区域是LCD屏，LCD屏的下方是背光源，所述背光源包括一背光扩散板，设置成：对侧向来光进行散射以均匀照亮屏幕。图5的左侧是本发明特有的光收集器。在光收集器的上表面，覆盖有上述的单向透射-单向反射膜，膜的下部是个内部透明的腔体。在该腔体的右侧是透明的照射窗，其余几个表面则是全反射面。该背光源模组将来自于上方的环境光，穿过单向透光膜进入腔体内部后，由于膜的单向透光特性，光线无法再射出到外界，只能被腔体的内壁反复反射，并最终从腔体的右侧射出到背光扩散板，照亮LCD屏。
上述背光源模组直接收集环境光，导入透射式液晶屏的背光侧，增强背光强度。该背光源无需消耗任何电量，并能够随着环境光的增强自动增加背光强度，改善屏幕的显示效果。
图6是一个带LCD显示屏的平板电脑示意图，在LCD显示屏的一侧安装了光收集器设置成：收集环境光，增加环境光收集功能后，跟传统的LCD屏相比，虽然牺牲了一部分屏幕的空间，但在户外强光下的LCD屏显示效果远超传统设备，有很强的实用价值。
下面根据一个实际的含环境光收集功能的液晶显示屏为例，对本发明进行进一步的描述。
假设光收集器为一块长方体玻璃，上表面覆盖单向透光膜，单向透光膜上的微透镜直径是200um，单向透光膜上的透明窗(圆形)直径是40um。单向透光膜的反射侧的反光材料的反射率是90％，单向透光膜的透射侧的微透镜介质的吸收率是10％，微透镜表面的反射率是10％，微透镜的光路损失是10％；
计算来自透射侧的光线穿越透明窗到达反射侧的比例为：
0.9*0.9*0.9＝73％；
计算反光材料的有效面积占反射侧的比例为：
1-(1/4*pi*40*40)/(1/4*pi*200*200)＝96％；
计算反射侧的宏观反射率为：
96％*90％＝86％；
假设光收集器的上表面的面积为10cm*5cm，厚度为0.5cm，环境光照度为100000lux的强光(相当于晴天中午的阳光直射)；
则从上表面投射下来的光通量为：
100000*(0.1*0.05)＝500lm；
环境光穿越单向透光膜，进入光收集器内部的光通量为：
500lm*73％＝365lm；
进入光收集器内部的光线，被玻璃反射吸收并从一侧的透明照射窗射出。设光收集器一个侧面(面积为10cm*0.5cm)为透明的照射窗，透明窗的透射率是90％，反射率是10％，已知单向透光膜的反射侧的宏观反射率是86％，光收集器的各全反射面的介质吸收率为10％，反射率为90％；
假设光收集器内部照度为x，则光收集器内部各个表面吸收的光通量为：
上表面：(0.1*0.05)*(1-86％)*x＝0.0007*x；
下表面：(0.1*0.05)*(1-90％)*x＝0.0005*x；
透明照射窗所在的侧面：0.1*0.005*90％*x＝0.00045*x；
其余三个侧面一共：
(0.05*0.005*2+0.1*0.005)*10％*x＝0.0001*x；
因此，光收集器内部各个表面吸收的光通量一共：0.0007*x+0.0005*x+0.00045*x+0.0001*x
解如下方程：
0.0007x+0.0005x+0.00045x+0.0001x＝365lm
解方程可得到光收集器内部的照度x为：
x＝208571勒克斯；
光收集器内部的照度为208571勒克斯时，已远超外部环境的照度一倍以上。
穿过透明照射窗的光通量为：
208571*(0.1*0.005)*90％＝94流明；
根据当前的白光LED大约每瓦100流明的效率估算，94流明大约相当于一个1W的LED背光源。
这来自环境光收集区的94流明光通量，通过LCD屏幕的背光扩散板散射到屏幕表面，以效率90％估算，假设LCD屏幕的面积为10cm*10cm，相当于背光的照度增加了：
94*90％/(0.1*0.1)＝8460lux；
对于理想的漫散射表面，lux/圆周率＝nit，我们近似认为屏幕上的光线均匀地向各个角度射出，因此，对应的屏幕亮度增加了：
8460/3.14＝2694nit；
即屏幕亮度增加了2694纳特。
由于一般的LCD显示屏，屏幕背光亮度仅500纳特左右，增加的亮度相对于原有的背光是非常巨大的。以屏幕反光仅5％的显示屏为例，列表对比如下：
Figure PCTCN2014088903-appb-000001
Figure PCTCN2014088903-appb-000002
可见，具有环境光收集功能的液晶显示屏，在日光直射下，背光亮度是普通屏幕六倍多，对比度提升130％，因此，屏幕的可视度得到了大幅度的提升。
上述实施例提供的一种单向透光膜、光收集器和背光源模组，利用微透镜技术制作的单向透光膜(单向透射-单向反射膜)，能够让来自于单向透光膜上方(透射侧)的光线的大部分穿透自身，而将来自于单向透光膜下方(反射侧)的光线的大部分反射回去，利用该单向透光膜制作的光收集器能够收集环境光并从光收集器侧面的透明照射窗射出，集成了该光收集器的背光源模组，能够利用光收集器收集环境光并导入背光扩散板，照亮液晶显示屏，因此所述背光源模组能够在不增加背光功耗的前提下，提高透射式液晶屏的背光亮度，提升在户外强光下的屏幕可视度。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现，相应地，上述实施例中的各模块/单元可以采用 硬件的形式实现，也可以采用软件功能模块的形式实现。本发明不限制于任何特定形式的硬件和软件的结合。
需要说明的是，本发明还可有其他多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性
本发明实施例提供的一种单向透光膜、光收集器和背光源模组，利用微透镜技术制作的单向透光膜(单向透射-单向反射膜)，能够让来自于单向透光膜上方(透射侧)的光线的大部分穿透自身，而将来自于单向透光膜下方(反射侧)的光线的大部分反射回去，利用该单向透光膜制作的光收集器能够收集环境光并从光收集器侧面的透明照射窗射出，集成了该光收集器的背光源模组，能够利用光收集器收集环境光并导入背光扩散板，照亮液晶显示屏，因此所述背光源模组能够在不增加背光功耗的前提下，提高透射式液晶屏的背光亮度，提升在户外强光下的屏幕可视度。因此本发明具有很强的工业实用性。

Claims (12)

  1. 一种单向透光膜，包括：一透明基板，所述透明基板包括上表面和下表面；
    所述透明基板的上表面覆盖有微透镜阵列，所述微透镜阵列中的微透镜是凸透镜；
    所述透明基板的下表面覆盖有反光材料层，所述反光材料层设置成：反射从所述单向透光膜下方入射的光，所述反光材料层与每一微透镜的中心相对应的位置开有透明窗，从所述单向透光膜上方入射的光汇聚于所述透明窗内并穿过所述反光材料层。
  2. 如权利要求1所述的单向透光膜，其中：
    每一个透明窗位于对应微透镜的焦平面上。
  3. 如权利要求1所述的单向透光膜，其中：
    所述微透镜的形状为圆形、正方形或正六边形。
  4. 如权利要求1-3中任一项所述的单向透光膜，其中：
    所述微透镜阵列密集排列，相邻的微透镜之间相接。
  5. 如权利要求1-3中任一项所述的单向透光膜，其中：
    所述透明窗的面积小于对应微透镜通光面积的1/3。
  6. 如权利要求1-3中任一项所述的单向透光膜，其中：
    所述单向透光膜为软膜或硬膜。
  7. 一种光收集器，包括透明体，
    所述透明体的顶面覆盖有如权利要求1-6中任一项所述的单向透光膜，所述透明体除一个侧面外，其他表面均覆盖有反光面向内的反光材料层。
  8. 如权利要求7所述的光收集器，其中：
    所述透明体是长方体。
  9. 一种光收集器，包括一盒体，
    所述盒体的顶面为如权利要求1-6中任一项所述的单向透光膜，或者，所述盒体的顶面覆盖有如权利要求1-6中任一项所述的单向透光膜；
    所述盒体一侧为透明的照射窗，所述盒体的其他侧面和底面的内壁覆盖有反光面向内的反光材料层。
  10. 如权利要求9所述的光收集器，其中：
    所述盒体内部是空气或其他透明介质。
  11. 一种背光源模组，包括背光源，所述背光源包括一背光扩散板，所述背光扩散板设置成：对侧向来光进行散射以均匀照亮液晶显示屏，该背光源模组还包括：
    如权利要求7或8所述的光收集器，所述光收集器的未覆盖反光材料层的侧面与所述背光扩散板的侧面相接；
    所述光收集器设置成：收集环境光，将收集到的环境光导入所述背光扩散板的侧向。
  12. 一种背光源模组，包括背光源，所述背光源包括一背光扩散板，所述背光扩散板设置成：对侧向来光进行散射以均匀照亮液晶显示屏，该背光源模组还包括：
    如权利要求9或10所述的光收集器，所述光收集器的照射窗所在的侧面与所述背光扩散板的侧面相接；
    所述光收集器设置成：收集环境光，将收集到的环境光导入所述背光扩散板的侧向。
PCT/CN2014/088903 2014-08-13 2014-10-20 一种单向透光膜、光收集器和背光源模组 WO2015154413A1 (zh)

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