CN1987606B - Backlight module and liquid crystal display module - Google Patents

Backlight module and liquid crystal display module Download PDF

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Publication number
CN1987606B
CN1987606B CN2005101212465A CN200510121246A CN1987606B CN 1987606 B CN1987606 B CN 1987606B CN 2005101212465 A CN2005101212465 A CN 2005101212465A CN 200510121246 A CN200510121246 A CN 200510121246A CN 1987606 B CN1987606 B CN 1987606B
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guide plate
light
light guide
liquid crystal
light source
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CN1987606A (en
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简克伟
许育儒
陈信铭
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Innolux Shenzhen Co Ltd
Innolux Corp
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Innolux Shenzhen Co Ltd
Innolux Display Corp
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Abstract

The backlight module includes stacked up a first light guide plate, and a second light guide plate in sequence. The first light guide plate includes a first bottom face, where there are multiple firstmicrostructures of possessing reflection function. The second light guide plate includes a second bottom face, where there are multiple second microstructures of possessing diffusion function. The backlight module possesses function of switching angular field of coming out light.

Description

背光模组与液晶显示模组Backlight module and liquid crystal display module

【技术领域】【Technical field】

本发明涉及一种背光模组和使用该背光模组的液晶显示模组。The invention relates to a backlight module and a liquid crystal display module using the backlight module.

【背景技术】【Background technique】

众所周知，液晶显示器的视角问题一直都受到业界的广泛关注。不仅具有广视角的液晶显示器越来越受到市场瞩目，而且具有高亮度、防窥性的小视角液晶显示器也受到市场欢迎。因此，可切换视角式液晶显示器已成为显示领域的发展方向之一。As we all know, the viewing angle of liquid crystal displays has always been widely concerned by the industry. Not only liquid crystal displays with wide viewing angles are attracting more and more attention from the market, but also liquid crystal displays with high brightness and small viewing angles that are anti-peeping are also popular in the market. Therefore, a switchable viewing angle liquid crystal display has become one of the development directions in the display field.

目前，通常通过外加一液晶面板，并利用驱动电路来控制改变该液晶面板像素单元的开闭来实现视角的切换。At present, the switching of the viewing angle is usually achieved by adding a liquid crystal panel and using a driving circuit to control the opening and closing of the pixel units of the liquid crystal panel.

图1是一种现有技术液晶显示模组的结构示意图。该液晶显示模组1包括自上至下依次层叠设置的一第一液晶面板10、一第二液晶面板12与一背光模组14。该背光模组14为该两个液晶面板10、12提供平面光，其包括一光源141与一导光板142。该导光板142包括一入光面143、一与该入光面143相邻的出光面144和一与该出光面144相对的底面145。该底面145是具有扩散点的粗糙平面。该光源141位于该导光板142的入光面143一侧。FIG. 1 is a schematic structural diagram of a liquid crystal display module in the prior art. The liquid crystal display module 1 includes a first liquid crystal panel 10 , a second liquid crystal panel 12 and a backlight module 14 which are stacked sequentially from top to bottom. The backlight module 14 provides planar light for the two liquid crystal panels 10 , 12 , and includes a light source 141 and a light guide plate 142 . The light guide plate 142 includes a light incident surface 143 , a light exit surface 144 adjacent to the light incident surface 143 , and a bottom surface 145 opposite to the light exit surface 144 . The bottom surface 145 is a rough plane with diffused points. The light source 141 is located at a side of the light incident surface 143 of the light guide plate 142 .

该第一液晶面板10包括自上而下依序层叠设置的一第一上基板101、一第一液晶层102与一第一下基板103。该第一液晶层102具有多个像素单元104，并且各像素单元104矩阵排列。该第二液晶面板12也包括自上而下依序层叠设置的一第二上基板121、一第二液晶层122与一第二下基板123。The first liquid crystal panel 10 includes a first upper substrate 101 , a first liquid crystal layer 102 and a first lower substrate 103 stacked in sequence from top to bottom. The first liquid crystal layer 102 has a plurality of pixel units 104, and each pixel unit 104 is arranged in a matrix. The second liquid crystal panel 12 also includes a second upper substrate 121 , a second liquid crystal layer 122 and a second lower substrate 123 stacked in sequence from top to bottom.

当自光源141发出的光线经过入光面143射入该导光板142后，一部分光将直接射向该第二液晶面板12，另一部分光线a将射向该底面145，而被扩散点扩散形成光束b，然后再射向该第二液晶面板12。自各个方向透射过该第二液晶面板12的散射光束c将射向该第一液晶面板10。同时，利用驱动电路去控制该第一液晶面板10的第一液晶层102的奇数列或偶数列像素单元104的打开或关闭，则被关闭的像素单元104由于不透光而形成一黑色吸收带105。散射光束c射入该第一液晶层102时，该光束c将被分为三部分：出射角小于或等于θ1的光线可以透射过该第一液晶面板10，出射角大于θ1且小于或等于θ2的光线将被吸收带105所吸收，出射角大于或等于θ3的光线将被反射回该第二液晶面板12，出射角大于θ2且小于θ3的光线也可透射过第一液晶面板10，其中，θ1是指出射点与邻近吸收带105邻近边缘的连线与法线之间的夹角，θ2是指出射点与邻近吸收带105另一边缘的连线与法线之间的夹角，θ3是指该第二基板103的临界角。由于超过临界角的光线被反射，并且出射角大于θ1且小于或等于θ2的光线会被吸收带105所吸收，进而导致透过该第一液晶面板10的光线集中在一个较小的角度，从而实现该液晶显示模组1的小视角显示模式。若全部打开该第一液晶层102的像素单元104，则可实现该液晶显示模组1的广视角显示模式。When the light emitted from the light source 141 enters the light guide plate 142 through the light incident surface 143, a part of the light will be directly directed to the second liquid crystal panel 12, and another part of the light a will be directed to the bottom surface 145, and will be diffused by the diffusion point to form The light beam b is then irradiated to the second liquid crystal panel 12 . The scattered light beam c transmitted through the second liquid crystal panel 12 from various directions will be directed to the first liquid crystal panel 10 . At the same time, use the drive circuit to control the opening or closing of the odd-numbered or even-numbered pixel units 104 of the first liquid crystal layer 102 of the first liquid crystal panel 10, and the closed pixel units 104 form a black absorption band because they are opaque. 105. When the scattered light beam c is incident on the first liquid crystal layer 102, the light beam c will be divided into three parts: the light with an exit angle less than or equal to θ 1 can pass through the first liquid crystal panel 10, and the light with an exit angle greater than θ 1 and less than or Light equal to θ 2 will be absorbed by the absorption band 105, and light rays with an exit angle greater than or equal to θ 3 will be reflected back to the second liquid crystal panel 12, and light rays with an exit angle greater than θ 2 and less than θ 3 can also be transmitted through the first liquid crystal panel 12. Liquid crystal panel 10, wherein, θ 1 refers to the angle between the line between the emission point and the adjacent edge of the absorption band 105 and the normal line, and θ 2 refers to the connection line and the normal of the emission point and the other edge of the adjacent absorption band 105 The angle between the lines, θ 3 refers to the critical angle of the second substrate 103 . Since the light exceeding the critical angle is reflected, and the light with an exit angle greater than θ 1 and less than or equal to θ 2 will be absorbed by the absorption band 105, resulting in the light passing through the first liquid crystal panel 10 concentrated at a smaller angle , so as to realize the small viewing angle display mode of the liquid crystal display module 1 . If all the pixel units 104 of the first liquid crystal layer 102 are turned on, the wide viewing angle display mode of the liquid crystal display module 1 can be realized.

综上所述，只要利用驱动电路去控制开闭该第一液晶面板10的像素单元104，即可实现该液晶显示模组1的广视角模式与小视角模式的切换。然而，由于液晶面板的成本较高，因此增加该第一液晶面板10将增加该液晶显示模组1的成本。另外，由于液晶面板的光穿透率较低，增加该第一液晶面板10，则会降低该液晶显示模组1的显示亮度。To sum up, as long as the driving circuit is used to control the opening and closing of the pixel unit 104 of the first liquid crystal panel 10 , the switching between the wide viewing angle mode and the small viewing angle mode of the liquid crystal display module 1 can be realized. However, since the cost of the liquid crystal panel is relatively high, adding the first liquid crystal panel 10 will increase the cost of the liquid crystal display module 1 . In addition, since the light transmittance of the liquid crystal panel is low, adding the first liquid crystal panel 10 will reduce the display brightness of the liquid crystal display module 1 .

【发明内容】【Content of invention】

为解决现有技术可切换视角范围液晶显示模组成本高的问题，有必要提供一种可切换出光视角范围的背光模组。In order to solve the problem of high cost of liquid crystal display modules with switchable viewing angle ranges in the prior art, it is necessary to provide a backlight module with switchable light output viewing angle ranges.

另外，为解决现有技术可切换视角范围的液晶显示模组成本较高的问题，也有必要提供一种成本较低且可切换视角范围的液晶显示模组。In addition, in order to solve the problem of high cost of liquid crystal display modules with switchable viewing angle ranges in the prior art, it is also necessary to provide a low-cost liquid crystal display module with switchable viewing angle ranges.

一种背光模组，其为一液晶面板提供平面光，包括一第一光源，一第二光源，一第一导光板与一该第一导光板层叠设置的第二导光板，且第一导光板较第二导光板更靠近该液晶面板设置。该第一导光板包括一第一底面、一第一入光面和一与该第一入光面相邻且与该第一底面相对的一第一出光面，该第一光源邻近该第一入光面设置，该第一底面包括多个具有反射功能的第一微结构。该第二导光板包括一第二底面、一第二入光面和一与该第二入光面相邻且与该第二底面相对的第二出光面，该第二光源邻近该第二入光面设置，该第二底面包括多个具有扩散功能的第二微结构。该第一光源与该第二光源分别向该第一导光板与第二导光板入射光线，当仅点亮该第一光源时，如果入射光线的入射角大于或等于该第一微结构的临界角，则该入射光线发生全反射现象，从而将原本向各个方向散射的光线改变为较集中的光线出射，若入射光线以小于该临界角的入射角入射时，该入射光线将被折射而射入下一个第一微棱镜结构继续反射与折射动作，直至发生全反射现象为止；当仅点亮该第二光源时，入射光线先经该第二微结构散射后入射至该第一底面，再经该第一微结构进一步折射后发散出射。A backlight module, which provides planar light for a liquid crystal panel, includes a first light source, a second light source, a first light guide plate and a second light guide plate stacked on the first light guide plate, and the first light guide plate The light plate is arranged closer to the liquid crystal panel than the second light guide plate. The first light guide plate includes a first bottom surface, a first light incident surface, and a first light exit surface adjacent to the first light incident surface and opposite to the first bottom surface. The first light source is adjacent to the first light incident surface. The light incident surface is provided, and the first bottom surface includes a plurality of first microstructures with reflective functions. The second light guide plate includes a second bottom surface, a second light incident surface, and a second light exit surface adjacent to the second light incident surface and opposite to the second bottom surface. The second light source is adjacent to the second light incident surface. The light surface is arranged, and the second bottom surface includes a plurality of second microstructures with a diffusion function. The first light source and the second light source incident light to the first light guide plate and the second light guide plate respectively, when only the first light source is turned on, if the incident angle of the incident light is greater than or equal to the critical If the incident light angle is smaller than the critical angle, the incident light will undergo total reflection, so that the light scattered in all directions will be changed into a more concentrated light. If the incident light is incident at an angle smaller than the critical angle, the incident light will be refracted and shot into the next first microprism structure to continue the reflection and refraction action until total reflection occurs; when only the second light source is turned on, the incident light is first scattered by the second microstructure and then incident on the first bottom surface, and then After being further refracted by the first microstructure, it diverges and exits.

一种液晶显示模组，其包括一液晶面板与一背光模组，该背光模组为该液晶面板提供平面光，其包括一第一光源，一第二光源，以及依序层叠设置的一第一导光板与一第二导光板。该第一导光板较第二导光板更靠近该液晶面板设置，其包括一第一底面、一第一入光面和一与该第一入光面相邻且与该第一底面相对的一第一出光面，该第一光源邻近该第一入光面设置，该第一底面包括多个具有反射功能的第一微结构。该第二导光板包括一第二底面、一第二入光面和一与该第二入光面相邻且与该第二底面相对的第二出光面，该第二光源邻近该第二入光面设置，该第二底面包括多个具有扩散功能的第二微结构。该第一光源与该第二光源分别向该第一导光板与第二导光板入射光线，当仅点亮该第一光源时，如果入射光线的入射角大于或等于该第一微结构的临界角，则该入射光线发生全反射现象，从而将原本向各个方向散射的光线改变为较集中的光线出射，若入射光线以小于该临界角的入射角入射时，该入射光线将被折射而射入下一个第一微棱镜结构继续反射与折射动作，直至发生全反射现象为止；当仅点亮该第二光源时，入射光线先经该第二微结构散射后入射至该第一底面，再经该第一微结构进一步折射后发散出射。A liquid crystal display module, which includes a liquid crystal panel and a backlight module. The backlight module provides planar light for the liquid crystal panel. It includes a first light source, a second light source, and a first light source stacked in sequence. A light guide plate and a second light guide plate. The first light guide plate is arranged closer to the liquid crystal panel than the second light guide plate, and includes a first bottom surface, a first light incident surface, and a side adjacent to the first light incident surface and opposite to the first bottom surface. The first light-emitting surface, the first light source is disposed adjacent to the first light-incident surface, and the first bottom surface includes a plurality of first microstructures with reflective functions. The second light guide plate includes a second bottom surface, a second light incident surface, and a second light exit surface adjacent to the second light incident surface and opposite to the second bottom surface. The second light source is adjacent to the second light incident surface. The light surface is arranged, and the second bottom surface includes a plurality of second microstructures with a diffusion function. The first light source and the second light source incident light to the first light guide plate and the second light guide plate respectively, when only the first light source is turned on, if the incident angle of the incident light is greater than or equal to the critical If the incident light angle is smaller than the critical angle, the incident light will undergo total reflection, so that the light scattered in all directions will be changed into a more concentrated light. If the incident light is incident at an angle smaller than the critical angle, the incident light will be refracted and shot into the next first microprism structure to continue the reflection and refraction action until total reflection occurs; when only the second light source is turned on, the incident light is first scattered by the second microstructure and then incident on the first bottom surface, and then After being further refracted by the first microstructure, it diverges and exits.

与现有技术相比，上述背光模组可利用调整两个导光板使其发出两种视角范围的光线即可实现显示的小视角模式与广视角模式的切换功能。由于导光板成本较低，所以该液晶显示模组能达到降低成本的目的。Compared with the prior art, the above-mentioned backlight module can realize the switch function between the small viewing angle mode and the wide viewing angle mode by adjusting the two light guide plates to emit light in two viewing angle ranges. Since the cost of the light guide plate is relatively low, the liquid crystal display module can achieve the purpose of reducing the cost.

【附图说明】【Description of drawings】

图1是现有技术液晶显示模组的结构示意图。FIG. 1 is a schematic structural diagram of a liquid crystal display module in the prior art.

图2是本发明液晶显示模组第一实施方式的结构示意图。FIG. 2 is a schematic structural view of the first embodiment of the liquid crystal display module of the present invention.

图3是该第一光源点亮时该背光模组的光路原理示意图。FIG. 3 is a schematic diagram of the optical path principle of the backlight module when the first light source is turned on.

图4是图3中IV部分的放大示意图。FIG. 4 is an enlarged schematic view of part IV in FIG. 3 .

图5是该第二光源点亮时该背光模组的光路原理示意图。FIG. 5 is a schematic diagram of the optical path principle of the backlight module when the second light source is turned on.

图6是本发明液晶显示模组第二实施方式的结构示意图。FIG. 6 is a schematic structural view of the second embodiment of the liquid crystal display module of the present invention.

【具体实施方式】【Detailed ways】

图2是本发明液晶显示模组第一实施方式的结构示意图。该液晶显示模组2包括一液晶面板20与一背光模组21，该背光模组21为该液晶面板20提供平面光。FIG. 2 is a schematic structural view of the first embodiment of the liquid crystal display module of the present invention. The liquid crystal display module 2 includes a liquid crystal panel 20 and a backlight module 21 , and the backlight module 21 provides planar light for the liquid crystal panel 20 .

该液晶面板20包括依次层叠设置的一第一基板201、一液晶层202与一第二基板203。该背光模组21包括依序层叠设置的一扩散片22、一第一增光片23、一第二增光片24、一第一导光板25、一第二导光板27与一反射片29。The liquid crystal panel 20 includes a first substrate 201 , a liquid crystal layer 202 and a second substrate 203 which are sequentially stacked. The backlight module 21 includes a diffusion sheet 22 , a first brightness enhancement sheet 23 , a second brightness enhancement sheet 24 , a first light guide plate 25 , a second light guide plate 27 and a reflection sheet 29 stacked in sequence.

该第一导光板25为一楔形板，其包括一第一入光面251、一与该第一入光面251垂直相连的一第一出光面252、一与该第一入光面251倾斜相连的第一底面253。该第一入光面251一侧还设置有一第一光源26。该第一底面253设置有多个第一微结构254，该第一微结构254具有全反射功能，通常为“V”形沟槽或微棱镜结构，且该第一微结构254与该第一光源26相距越远则分布越密。The first light guide plate 25 is a wedge-shaped plate, which includes a first light incident surface 251, a first light exit surface 252 vertically connected to the first light incident surface 251, and a first light incident surface 251 inclined to the first light incident surface 251. The connected first bottom surface 253 . A first light source 26 is also disposed on one side of the first light incident surface 251 . The first bottom surface 253 is provided with a plurality of first microstructures 254, the first microstructures 254 have a total reflection function, and are generally "V" shaped grooves or microprism structures, and the first microstructures 254 and the first The farther apart the light sources 26 are, the denser the distribution will be.

该第二导光板27也为一楔形板，其包括一第二入光面271、一与该第二入光面271倾斜相连的一第二出光面272、一与该第二入光面271垂直相连的一第二底面273。该第二入光面271一侧还设置有一第二光源28。该第二底面273设置有多个第二微结构274，该第二微结构274具有扩散功能，通常为网点结构或微反射镜结构，且该第二微结构274与该第二光源28相距越远则分布越密。The second light guide plate 27 is also a wedge-shaped plate, which includes a second light incident surface 271, a second light exit surface 272 obliquely connected to the second light incident surface 271, and a second light incident surface 271 connected to the second light incident surface 271. A second bottom surface 273 connected vertically. A second light source 28 is further disposed on one side of the second light incident surface 271 . The second bottom surface 273 is provided with a plurality of second microstructures 274, the second microstructures 274 have a diffusion function, usually dot structure or micro mirror structure, and the distance between the second microstructures 274 and the second light source 28 is greater. The farther the distribution is, the denser it is.

该第一导光板25的第一底面253与该第二导光板27的第二出光面272相邻且平行设置，该第一出光面252与该第二底面273也平行。The first bottom surface 253 of the first light guide plate 25 is adjacent to and parallel to the second light emitting surface 272 of the second light guide plate 27 , and the first light emitting surface 252 is also parallel to the second bottom surface 273 .

请参阅图3与图4，图3为该第一光源26点亮时该背光模组21的光路原理示意图，图4为图3中IV部分的放大示意图。单独点亮该第一光源26时，一束光射至该第一底面253的第一微结构254，由于该第一微结构254为具有全反射功能的结构，如果光线d的入射角θ4大于或等于该第一微结构254的临界角入射，那么该光线d将发生全反射现象，从而将原本向各个方向散射的光线改变成为较集中的光线；而当入射光线e以小于临界角的入射角入射时，该光线e将被折射而射入下一个第一微结构254继续反射与折射动作，直至发生全反射现象为止。可见，该第一微结构254将原本散射的光束集中在一个较小角度射出，从而达到较小角度的视角显示，再利用该两个增光片23、24的进一步集光作用，达到高亮度的小视角显示模式。Please refer to FIG. 3 and FIG. 4 , FIG. 3 is a schematic diagram of the optical path principle of the backlight module 21 when the first light source 26 is turned on, and FIG. 4 is an enlarged schematic diagram of part IV in FIG. 3 . When the first light source 26 is turned on alone, a beam of light hits the first microstructure 254 of the first bottom surface 253. Since the first microstructure 254 is a structure with a total reflection function, if the incident angle θ of light d = 4 greater than or equal to the critical angle of incidence of the first microstructure 254, then the light d will undergo total reflection, thereby changing the originally scattered light in all directions into a more concentrated light; and when the incident light e is less than the critical angle When the incident angle is incident, the light e will be refracted and enter the next first microstructure 254 to continue the reflection and refraction until total reflection occurs. It can be seen that the first microstructure 254 concentrates the originally scattered light beams at a smaller angle, so as to achieve a viewing angle display at a smaller angle, and then use the further light collection effect of the two brightness enhancement sheets 23, 24 to achieve high brightness. Small viewing angle display mode.

图5为该第二光源28点亮时该背光模组21的光路原理图。单独点亮该第二光源28时，由于该第二微结构274具有扩散功能，当一光线f射至该第二微结构274时，该光线f将向各个方向散射，散射光线将射向该第一导光板25的第一微结构254。以两散射光线g、h为例，由于对该第一微结构254而言，该光线g与光线h的入射点不同，光线f将在第一微结构254的一面发生折射形成光线i，而光线h将在另外一第一微结构254的一面发生折射再出射形成光线j，两者的出射光线i、j将更加分散。可见，自该光源28出射的光线经过第二导光板27的第二微结构274散射后，其散射光线将被该第一导光板25的第一微结构254进一步发散，从而形成一较广视角的显示模式。FIG. 5 is a schematic diagram of the optical path of the backlight module 21 when the second light source 28 is turned on. When the second light source 28 is turned on alone, since the second microstructure 274 has a diffusion function, when a light f hits the second microstructure 274, the light f will be scattered in all directions, and the scattered light will be directed toward the The first microstructure 254 of the first light guide plate 25 . Taking two scattered light rays g and h as an example, since the incident points of light g and light h are different for the first microstructure 254, light f will be refracted on one side of the first microstructure 254 to form light i, and The light h will be refracted on the other side of the first microstructure 254 and then emerge to form the light j, and the outgoing light i and j will be more dispersed. It can be seen that after the light emitted from the light source 28 is scattered by the second microstructure 274 of the second light guide plate 27, the scattered light will be further diverged by the first microstructure 254 of the first light guide plate 25, thereby forming a wider viewing angle. display mode.

同时点亮该两个光源26、28时，由于自该两个导光板25、27出射的光线将发生叠加，使该液晶显示模组2的显示亮度大大提高，达到高亮度的显示模式。When the two light sources 26 and 28 are turned on at the same time, since the light emitted from the two light guide plates 25 and 27 will be superimposed, the display brightness of the liquid crystal display module 2 will be greatly improved, reaching a high-brightness display mode.

通过实验仿真和检测，该液晶显示模组2如果在小视角工作模式下，其水平方向的视角范围为±30°，垂直方向的视角范围为±35°；如果在广视角工作模式下，其水平方向的视角范围可以达到±70°，垂直方向的视角范围可以达到±65°。Through experimental simulation and detection, if the liquid crystal display module 2 is in the small viewing angle working mode, the viewing angle range in the horizontal direction is ±30°, and the viewing angle range in the vertical direction is ±35°; if it is in the wide viewing angle working mode, its The viewing angle range in the horizontal direction can reach ±70°, and the viewing angle range in the vertical direction can reach ±65°.

可见，该液晶显示模组2利用打开或关闭该两个光源26、28即可实现该液晶显示模组2的小视角模式与广视角模式的切换。由于导光板成本较低，所以该液晶显示模组2能够达到降低成本的目的。另外，同时点亮该两个光源26、28时，还可以实现高亮度的显示模式。It can be seen that the liquid crystal display module 2 can switch between the small viewing angle mode and the wide viewing angle mode by turning on or off the two light sources 26 and 28 . Since the cost of the light guide plate is low, the liquid crystal display module 2 can achieve the purpose of reducing the cost. In addition, when the two light sources 26 and 28 are turned on at the same time, a high-brightness display mode can also be realized.

图6为本发明第二实施方式液晶显示模组的结构示意图。该液晶显示模组3与第一实施方式液晶显示模组2的区别在于：该两个导光板35、37为平板形导光板。FIG. 6 is a schematic structural diagram of a liquid crystal display module according to a second embodiment of the present invention. The difference between the liquid crystal display module 3 and the liquid crystal display module 2 of the first embodiment is that the two light guide plates 35 and 37 are flat light guide plates.

在上述各实施方式中，其中任意一光源可以为一发光二极管。在该发光二极管光源中可以添加更多的色坐标，进而达到扩大液晶显示模组显示色域的目的。In each of the above embodiments, any one of the light sources may be a light emitting diode. More color coordinates can be added to the LED light source, thereby achieving the purpose of expanding the display color gamut of the liquid crystal display module.

Claims (9)

1. module backlight, it provides planar light for a liquid crystal panel, comprise one first light source and one first light guide plate, this first light guide plate comprises one first bottom surface, one first exiting surface that one first incidence surface is adjacent with this first incidence surface with one and relative with this first bottom surface, contiguous this first incidence surface setting of this first light source, this first bottom surface comprises a plurality of first microstructures with reflection function, it is characterized in that: this module backlight comprises that further a secondary light source reaches and one second light guide plate of the stacked setting of this first light guide plate, and this first light guide plate is provided with than more close this liquid crystal panel of this second light guide plate, this second light guide plate of second light guide plate comprises one second bottom surface, second exiting surface that one second incidence surface is adjacent with this second incidence surface with one and relative with this second bottom surface, contiguous this second incidence surface setting of this secondary light source, this second bottom surface comprises a plurality of second microstructures with diffusion function, this first light source and this secondary light source are respectively to this first light guide plate and the second light guide plate incident ray, when only lighting this first light source, if the incident angle of incident ray is more than or equal to the critical angle of this first microstructure, this incident ray generation total reflection phenomenon then, thereby will change into the beam projecting of concentrating to the light of all directions scattering originally, if incident ray is with less than the incident angle incident of this critical angle the time, this incident ray will be refracted and inject next first micro-prism structure and continue reflection and refraction action, until total reflection phenomenon takes place till, when only lighting this secondary light source, incident ray is incident to this first bottom surface earlier after this second microstructure scattering, further be divergent after the refraction through this first microstructure again.
2. module backlight as claimed in claim 1 is characterized in that: this first microstructure is " V " shape groove or micro-prism structure, and this second microstructure is lattice point structure or micro-mirror structure.
3. module backlight as claimed in claim 1 is characterized in that: this second exiting surface of this second light guide plate is adjacent with this first bottom surface of this first light guide plate and be arranged in parallel.
4. module backlight as claimed in claim 1 is characterized in that: this first light source and secondary light source are light emitting diode.
5. module backlight as claimed in claim 4 is characterized in that: this first microstructure and this second microstructure all are far away more apart with light source, and its distribution is close more.
6. module backlight as claimed in claim 1 is characterized in that: this first light guide plate and this second light guide plate are the wedge shape light guide plate.
7. module backlight as claimed in claim 6 is characterized in that: first bottom surface of this first light guide plate is the inclined-plane of wedge shape, and second bottom surface of this second light guide plate is the opposite face on wedge shape inclined-plane.
8. module backlight as claimed in claim 1 is characterized in that: this first light guide plate and this second light guide plate are plate shaped light guide plate.
9. liquid crystal display module, it comprises a liquid crystal panel and a module backlight, this module backlight is characterized in that for this liquid crystal panel provides planar light: this module backlight is claim 1 to 8 any described module backlight.
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