WO2014008704A1 - 背光模块及相应的液晶显示装置 - Google Patents

背光模块及相应的液晶显示装置 Download PDF

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Publication number
WO2014008704A1
WO2014008704A1 PCT/CN2012/080262 CN2012080262W WO2014008704A1 WO 2014008704 A1 WO2014008704 A1 WO 2014008704A1 CN 2012080262 W CN2012080262 W CN 2012080262W WO 2014008704 A1 WO2014008704 A1 WO 2014008704A1
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WIPO (PCT)
Prior art keywords
light
backlight module
light absorbing
guide plate
absorbing material
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Ceased
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PCT/CN2012/080262
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English (en)
French (fr)
Inventor
贺虎
张光耀
韦维砚
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/701,792 priority Critical patent/US20140009724A1/en
Publication of WO2014008704A1 publication Critical patent/WO2014008704A1/zh
Anticipated expiration legal-status Critical
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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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to the field of backlight design, and in particular to a backlight module and a corresponding liquid crystal display device capable of reducing crosstalk.
  • 3D display technology liquid crystal display devices with 3D display functions have attracted more and more people's attention and love.
  • common 3D display technologies for liquid crystal display devices include polarized 3D display technology and active shutter 3D display technology.
  • the active shutter type 3D display technology has better 3D stereoscopic display effect, and is suitable for liquid crystal display devices and the like, and is supported by many terminal manufacturers.
  • FIG. 1 is a schematic structural view of a backlight module of a conventional liquid crystal display device using an active shutter type 3D display technology
  • FIG. 2 is a cross-sectional view taken along line A-A' of FIG. Sectional view.
  • the backlight module includes a light guide plate 11 and an LED light source 12, wherein the LED light source 12 is divided into a first partition 101, a second partition 102, a third partition 103, and a fourth partition 104, when the LED light source of the first partition 101 is 12 points
  • the LED light source 12 of the other partitions is turned off, and the pixels of the corresponding positions on the display panel are driven to display an image; when the LED light source 12 of the second partition 102 is lit, the LED light sources 12 of other partitions are also turned off, and the display panel is also closed.
  • the pixels in the corresponding position are also driven to display the image; similarly to other partitions, each frame of the screen needs to perform such operations to display the image.
  • FIG. 3 is a schematic diagram of light field distribution of a backlight module of a liquid crystal display device using an active shutter type 3D display technology.
  • the light of the LED light source of each partition has a certain divergence. Angle, when the LED light source of the first partition 101 is lit, a certain amount of light leakage occurs at the side of the light guide plate near the fourth partition 104 at a side away from the LED light source, and the light leakage is that the light is reflected from the side of the light guide plate. Caused by dot scattering.
  • FIG. 4 is a schematic diagram of luminance crosstalk of a backlight module of a liquid crystal display device using an active shutter type 3D display technology, wherein a horizontal axis indicates a light exiting position along the X direction on a light emitting surface of the light guide plate ( As shown in Fig. 1, the X direction is perpendicular to the light incident direction; the vertical axis indicates the crosstalk rate corresponding to the light exiting position.
  • the side of the light guide plate at the high beam end shown as the starting point of the light guide plate away from the LED light source as the starting point, 1/9 of the length of the light guide plate) is the most serious, followed by the middle of the side of the light guide plate.
  • the object of the present invention is to provide a backlight module and a corresponding liquid crystal display device which are simple in structure, low in cost and can reduce crosstalk phenomenon well, and solve the problem that the light guide plate of the existing backlight module and the corresponding liquid crystal display device is The light leakage at the high beam end is more serious, which leads to a technical problem of serious crosstalk at the side of the light guide plate.
  • the invention relates to a backlight module, which comprises:
  • the light guide plate includes a light incident surface, a light exit surface and two side surfaces, wherein the light incident surface is perpendicular to the light exit surface, and the side surfaces are perpendicular to the light incident surface and the light exit surface, respectively, the light emitting surface Provided with a microstructure for concentrating light;
  • An LED light source disposed on a side of the light incident surface of the light guide plate and divided into at least two partitions, wherein the LED light source of each of the partitions is configured to output light to the light incident surface to pass the
  • the light guide plate provides backlight to the pixels of the corresponding position of the display panel;
  • the microstructure includes a plurality of elongated prisms, the elongated prisms are disposed in parallel with each other, and a length direction of the elongated prism is parallel to the side, and an end of the side away from the LED light source is further provided for A light absorbing tape or a light absorbing ink that absorbs light from the side.
  • the length of the side surface on which the light absorbing tape or the light absorbing ink is provided is 10% to 50% of the entire length of the side surface.
  • the length of the side surface on which the light absorbing tape or the light absorbing ink is provided is 10% to 20% of the entire length of the side surface.
  • the invention also relates to a backlight module comprising:
  • the light guide plate includes a light incident surface, a light exit surface and two side surfaces, wherein the light incident surface is perpendicular to the light exit surface, and the side surfaces are perpendicular to the light incident surface and the light exit surface, respectively, the light emitting surface Provided with a microstructure for concentrating light, the side surface being provided with a light absorbing material for absorbing side light; and
  • An LED light source disposed on a side of the light incident surface of the light guide plate and divided into at least two partitions, wherein the LED light source of each of the partitions is configured to output light to the light incident surface to pass the
  • the light guide plate provides backlighting to the pixels of the corresponding position of the display panel.
  • the microstructure includes a plurality of elongated prisms, the elongated prisms are disposed in parallel with each other, and a length direction of the elongated prism is parallel to the side, and the light absorbing material is disposed. At one end of the side away from the LED light source.
  • the length of the side surface on which the light absorbing material is provided is 10% to 50% of the entire length of the side surface.
  • the length of the side surface on which the light absorbing material is provided is 10% to 20% of the entire length of the side surface.
  • the light absorbing material is a light absorbing tape.
  • the light absorbing material is a light absorbing ink.
  • the light absorbing material is a light absorbing tape and a light absorbing ink.
  • the invention also relates to a liquid crystal display device comprising:
  • a display panel including a plurality of pixels for displaying an image
  • the backlight module includes:
  • the light guide plate includes a light incident surface, a light exit surface and two side surfaces, wherein the light incident surface is perpendicular to the light exit surface, and the side surfaces are perpendicular to the light incident surface and the light exit surface, respectively, the light emitting surface Provided with a microstructure for concentrating light, the side surface being provided with a light absorbing material for absorbing side light; and
  • An LED light source disposed on a side of the light incident surface of the light guide plate and divided into at least two partitions, wherein the LED light source of each of the partitions is configured to output light to the light incident surface to pass the
  • the light guide plate provides backlighting to the pixels of the corresponding position of the display panel.
  • the microstructure includes a plurality of elongated prisms, the elongated prisms are disposed in parallel with each other, and a length direction of the elongated prism is parallel to the side surface, and the light absorbing material An end of the side away from the LED light source is disposed.
  • the length of the side surface on which the light absorbing material is provided is 10% to 50% of the entire length of the side surface.
  • the length of the side surface on which the light absorbing material is provided is 10% to 20% of the entire length of the side surface.
  • the light absorbing material is a light absorbing tape.
  • the light absorbing material is a light absorbing ink.
  • the light absorbing material is a light absorbing tape and a light absorbing ink.
  • the backlight module and the corresponding liquid crystal display device of the invention have the advantages of simple structure and low cost, and can substantially reduce the crosstalk phenomenon, and solve the existing backlight module and corresponding
  • the serious light leakage at the side of the light guide plate on the side of the light guide plate of the liquid crystal display device causes a serious problem of crosstalk at the side of the light guide plate.
  • FIG. 1 is a schematic structural view of a backlight module of a liquid crystal display device using an active shutter type 3D display technology
  • Figure 2 is a cross-sectional view taken along the line A-A' of Figure 1;
  • FIG. 3 is a schematic diagram of light field distribution of a backlight module of a liquid crystal display device using an active shutter type 3D display technology
  • FIG. 4 is a schematic diagram of luminance crosstalk of a backlight module of a liquid crystal display device using an active shutter type 3D display technology
  • FIG. 5 is a schematic structural view of a preferred embodiment of a backlight module of the present invention.
  • FIG. 6 is a schematic diagram of a light field distribution of a preferred embodiment of a backlight module of the present invention.
  • FIG. 7 is a schematic diagram of luminance crosstalk of a preferred embodiment of a backlight module of the present invention.
  • FIG. 5 is a schematic structural view of a preferred embodiment of a backlight module of the present invention.
  • the backlight module includes a light guide plate 21 and an LED light source 22, wherein the light guide plate 21 includes a light incident surface 211, a light exit surface 212, and two side surfaces 213.
  • the light incident surface 211 is perpendicular to the light exit surface 212
  • the side surface 213 is perpendicular to the light incident surface.
  • 211 and the light-emitting surface 212, the surface of the light-emitting surface 212 is provided with a microstructure for condensing light (as shown in FIG.
  • the microstructure includes a plurality of elongated prisms, the long prisms are arranged parallel to each other, and the long prisms are The length direction is parallel to the side 213.
  • the LED light source 22 is disposed on the light incident surface 211 side of the light guide plate 21, and is divided into at least two partitions (four in FIG. 5, respectively being the first partition 201, the second partition 202, the third partition 203, and the fourth partition). 204), each of the partitioned LED light sources 22 outputs light to the light incident surface to provide backlighting to pixels of corresponding positions of the display panel through the light emitting surface 212 of the light guide plate.
  • the side surface 213 of the light guide plate 21 of the backlight module of the present invention is further provided with a light absorbing material 214 for absorbing the light emitted from the side surface 213, and the light absorbing material 214 may be a light absorbing tape (such as black tape), a light absorbing ink (such as black ink), or light absorbing. Tape and light absorbing ink. Among them, the black ink has better light absorption effect; if the light absorption tape is attached on the side surface 213, and the light absorption ink is coated on the corresponding light absorption tape, the light absorption effect can be well achieved, and the black ink can be avoided. Diffusion on the light panel 21.
  • the light absorbing material 214 is disposed at one end of the side surface 213 away from the LED light source 22.
  • the length of the side surface 213 provided with the light absorbing material 214 is 10% to 50% of the length of the entire side surface 213, and the length of the side surface 213 of the light absorbing material 214 is preferably disposed. 10% to 20% of the length of the entire side 213. Since the light leakage at the side of the light guide plate 21 mainly occurs at the far end of the side surface 213 of the light guide plate 21, the light absorbing material 214 does not have to cover the side surface 213 of the entire light guide plate 21, and only needs to cover 10% of the length of the side surface 213 of the light guide plate 21.
  • the absorption of the side surface 213 can also avoid the absorption of the normal light propagating light in the light guide plate 21 by the light absorbing material 214.
  • the light absorbing material 214 covers 10% to 20% of the length of the side surface 213 of the light guide plate 21, and the light absorption at the side surface can be maximized. Therefore, it is preferable that the length of the side surface 213 provided with the light absorbing material 214 is occupied. The entire side surface 213 is 10% to 20% of the length, so that the absorption of the normally propagating light in the light guide plate 21 by the light absorbing material 214 can be avoided to the utmost extent.
  • FIGS. 5 to 7. 6 is a schematic diagram of light field distribution of a preferred embodiment of a backlight module of the present invention
  • FIG. 7 is a schematic diagram of luminance crosstalk of a preferred embodiment of the backlight module of the present invention.
  • the LED light source 22 is also divided into a first partition 201, a second partition 202, a third partition 203, and a fourth partition 204.
  • the LED light source 22 of the first partition 201 is illuminated, the LED light sources 22 of other partitions are turned off, and the pixels at corresponding positions on the display panel are driven to display images, and the operation is similar to the LED light sources 22 of other partitions.
  • Each frame of the picture realizes the display of the corresponding image by sequentially driving the LED light source 22 of the above partition and the pixel of the corresponding position of the display panel.
  • FIG. 6 is a schematic diagram of light field distribution when the LED light source 22 of the first partition 201 is lit, and the LED light source 22 of other partitions is turned off.
  • FIG. 7 is a schematic diagram of luminance crosstalk of the backlight module of the present invention when implementing active shutter type 3D display.
  • the far end of the fourth partition 204 ie, one side 213 of the light guide plate 21
  • the entire light field exhibits a uniform distribution, that is, the first partition 201 to the fourth partition.
  • the intensity of the light field gradually weakens, and the high beam end near the side of the fourth partition 204 does not leak light.
  • the crosstalk of the display panel near the high beam end of the side is also greatly reduced, wherein the horizontal axis indicates the light exiting the light guide plate 21.
  • the light exiting position (shown in FIG. 5) along the X' direction on the surface 212, the X' direction is perpendicular to the light incident direction, and the vertical axis indicates the crosstalk rate corresponding to the light exiting position.
  • the crosstalk near the side of the fourth section 204 at the high beam end is the case where the light absorbing material 214 is not provided. 1/2 or so (the crosstalk rate at the far end is 65% after the improvement, and the crosstalk at the far end is less than 30% after the improvement); the crosstalk rate at the far end is closer to the side of the first partition 201. About 1/3 of the light absorbing material 214 is provided. Therefore, the length of the side surface 213 provided with the light absorbing material 214 is 10% to 20% of the length of the entire side surface 213, thereby eliminating luminance crosstalk of 50% or more.
  • the backlight module of the present invention realizes the active shutter type 3D display
  • the light leakage at the far end of the side surface 213 of the light guide plate 21 can be greatly reduced, and thus the luminance crosstalk at the side of the light guide plate 21 is greatly reduced.
  • the present invention also relates to a liquid crystal display device including a display panel including a plurality of pixels for displaying an image, and a backlight module.
  • the backlight module includes a light guide plate and an LED light source.
  • the light guide plate includes a light incident surface, a light exit surface and two side surfaces. The light incident surface is perpendicular to the light exit surface, and the side surfaces are perpendicular to the light incident surface and the light exit surface respectively.
  • the microstructure of the concentrated light the microstructure includes a plurality of elongated prisms disposed parallel to each other, and the longitudinal direction of the elongated prism is parallel to the side.
  • the LED light source is disposed on a light incident surface side of the light guide plate, and is divided into at least two partition light sources, and each of the divided LED light sources outputs light to the light incident surface to pass the light emitting surface of the light guide plate to the corresponding position of the display panel.
  • the pixels provide backlighting.
  • a light absorbing material for absorbing light from the side surface is further provided on a side surface of the light guide plate of the liquid crystal display device of the present invention.
  • the light absorbing material is disposed at one end of the side away from the LED light source, and the length of the side surface on which the light absorbing material is disposed is 10% to 50% of the length of the entire side surface, and preferably the length of the side surface of the light absorbing material is 10% to 20% of the length of the entire side surface. %.
  • the backlight module and the corresponding liquid crystal display device of the invention have the advantages of simple structure and low cost, and can simultaneously reduce the crosstalk phenomenon, and solve the side of the light guide plate of the existing backlight module and the corresponding liquid crystal display device at the high beam end. Severe light leakage causes technical problems that are more serious at the side of the light guide plate.

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Description

背光模块及相应的液晶显示装置 技术领域
本发明涉及背光设计领域，特别是涉及一种可减小串扰的背光模块及相应的液晶显示装置。
 背景技术
随着3D显示技术的发展，具有3D显示功能的液晶显示装置越来越受到人们的关注和喜爱。目前液晶显示装置常见的3D显示技术包括偏光式3D显示技术和主动快门式3D显示技术。其中主动快门式3D显示技术的3D立体显示效果较好，适合液晶显示装置等相应的产品，受到较多终端制造商的支持。
采用主动快门式3D显示技术的液晶显示装置工作时，背光模块需提供多个分区的背光，然后以扫描方式依次点亮每个分区的背光并同时驱动相应位置的显示面板上的像素来实现图像显示。如图1和图2所示，图1为现有的采用主动快门式3D显示技术的液晶显示装置的背光模块的结构示意图，图2为按图1的A-A’的截面线所示的截面图。该背光模块包括导光板11和LED光源12，其中,LED光源12被分成了第一分区101、第二分区102、第三分区103以及第四分区104，当第一分区101的LED光源12点亮时，其他分区的LED光源12关闭，同时显示面板上相应位置的像素被驱动显示图像；当第二分区102的LED光源12点亮时，其他分区的LED光源12也关闭，同时显示面板上相应位置的像素同样被驱动显示图像；同理到其他分区，每帧画面都需要进行这样的操作来显示图像。
快门式3D显示的显示效果主要由不同分区之间的串扰来衡量，串扰越低，显示效果越好。而不同分区之间的串扰又主要取决于不同分区之间亮度的相互影响，液晶显示装置的最佳显示状态为某一分区的背光点亮时，其余分区的背光均呈现暗态。尽管采用微结构的导光板可以较大程度的将光线收敛到光线传播方向上，但实际LED光源的出射光线还是具有一定的发散角度。如图3所示，图3为现有的采用主动快门式3D显示技术的液晶显示装置的背光模块的光场分布示意图，从图中可见，由于每个分区的LED光源的光线具有一定的发散角度，当第一分区101的LED光源点亮时，在靠近第四分区104的导光板侧面在远离LED光源的一端会出现一定程度的漏光，该漏光是光线收到导光板的侧边反射再经过网点散射而造成的。
如图4所示，图4为现有的采用主动快门式3D显示技术的液晶显示装置的背光模块的亮度串扰示意图，其中水平轴表示在导光板出光面上的沿着X方向的出光位置（图1中所示），X方向与入光方向垂直；垂直轴表示对应该出光位置的串扰率。从图中可见，导光板侧面在远光端（图中表示为以导光板的远离LED光源的一端为起点，导光板长度的1/9处）的串扰最为严重，其次为导光板侧面的中间位置（图中表示为导光板长度的1/2处），导光板侧面在近光端（图中表示为以导光板的靠近LED光源的一端为起点，导光板长度的1/9处）的串扰相对远光端较小。由于这种导光板的远光端在侧面的漏光程度较严重，因此容易在导光板的侧面处产生亮度串扰。
故，有必要提供一种背光模块及相应的液晶显示装置，以解决现有技术所存在的问题。
 技术问题
本发明的目的在于提供一种结构简单、成本低又可以很好的减小串扰现象的背光模块及相应的液晶显示装置，解决了现有的背光模块及相应的液晶显示装置的导光板侧面在远光端的漏光较为严重，导致导光板的侧面处串扰现象较为严重的技术问题。
 技术解决方案
本发明提供的技术方案如下：
本发明涉及一种背光模块，其包括：
导光板，包括一入光面、一出光面以及两侧面，所述入光面垂直于所述出光面，所述侧面分别垂直于所述入光面和所述出光面，所述出光面上设置有用于会聚光线的微结构；以及
LED光源，设置在所述导光板的所述入光面一侧，并分成至少两个分区，每个所述分区的所述LED光源用于输出光线至所述入光面，以通过所述导光板给显示面板相应位置的像素提供背光；
所述微结构包括多个长条棱镜，所述长条棱镜相互平行设置，且所述长条棱镜的长度方向平行于所述侧面，所述侧面的远离所述LED光源的一端还设置有用于吸收侧面出光的吸光胶带或吸光油墨。
在本发明所述的背光模块中，设置有所述吸光胶带或吸光油墨的所述侧面的长度为整个所述侧面长度的10%至50%。
在本发明所述的背光模块中，设置有所述吸光胶带或吸光油墨的所述侧面的长度为整个所述侧面长度的10%至20%。
本发明还涉及一种背光模块，其包括：
导光板，包括一入光面、一出光面以及两侧面，所述入光面垂直于所述出光面，所述侧面分别垂直于所述入光面和所述出光面，所述出光面上设置有用于会聚光线的微结构，所述侧面上设置有用于吸收侧面出光的吸光材料；以及
LED光源，设置在所述导光板的所述入光面一侧，并分成至少两个分区，每个所述分区的所述LED光源用于输出光线至所述入光面，以通过所述导光板给显示面板相应位置的像素提供背光。
在本发明所述的背光模块中，所述微结构包括多个长条棱镜，所述长条棱镜相互平行设置，且所述长条棱镜的长度方向平行于所述侧面，所述吸光材料设置在所述侧面的远离所述LED光源的一端。
在本发明所述的背光模块中，设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至50%。
在本发明所述的背光模块中，设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至20%。
在本发明所述的背光模块中，所述吸光材料为吸光胶带。
在本发明所述的背光模块中，所述吸光材料为吸光油墨。
在本发明所述的背光模块中，所述吸光材料为吸光胶带和吸光油墨。
本发明还涉及一种液晶显示装置，其包括：
显示面板，包括多个用于显示图像的像素；以及
背光模块，包括：
导光板，包括一入光面、一出光面以及两侧面，所述入光面垂直于所述出光面，所述侧面分别垂直于所述入光面和所述出光面，所述出光面上设置有用于会聚光线的微结构，所述侧面上设置有用于吸收侧面出光的吸光材料；以及
LED光源，设置在所述导光板的所述入光面一侧，并分成至少两个分区，每个所述分区的所述LED光源用于输出光线至所述入光面，以通过所述导光板给显示面板相应位置的像素提供背光。
在本发明所述的液晶显示装置中，所述微结构包括多个长条棱镜，所述长条棱镜相互平行设置，且所述长条棱镜的长度方向平行于所述侧面，所述吸光材料设置在所述侧面的远离所述LED光源的一端。
在本发明所述的液晶显示装置中，设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至50%。
在本发明所述的液晶显示装置中，设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至20%。
在本发明所述的液晶显示装置中，所述吸光材料为吸光胶带。
在本发明所述的液晶显示装置中，所述吸光材料为吸光油墨。
在本发明所述的液晶显示装置中，所述吸光材料为吸光胶带和吸光油墨。
 有益效果
相较于现有的背光模块及相应的液晶显示装置，本发明的背光模块及相应的液晶显示装置结构简单、成本低，同时可以大幅减小串扰现象，解决了现有的背光模块及相应的液晶显示装置的导光板侧面在远光端的严重漏光导致导光板的侧面处串扰现象较为严重的技术问题。
 附图说明
图1为现有的采用主动快门式3D显示技术的液晶显示装置的背光模块的结构示意图；
图2为按图1的A-A’的截面线所示的截面图；
图3为现有的采用主动快门式3D显示技术的液晶显示装置的背光模块的光场分布示意图；
图4为现有的采用主动快门式3D显示技术的液晶显示装置的背光模块的亮度串扰示意图；
图5为本发明的背光模块的优选实施例的结构示意图；
图6为本发明的背光模块的优选实施例的光场分布示意图；
图7为本发明的背光模块的优选实施例的亮度串扰示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
在图中，结构相似的单元是以相同标号表示。
请参照图5，图5为本发明的背光模块的优选实施例的结构示意图。该背光模块包括导光板21以及LED光源22，其中导光板21包括一入光面211、一出光面212以及两侧面213，入光面211垂直于出光面212，侧面213分别垂直于入光面211和出光面212，出光面212表面设置有用于会聚光线的微结构（如图2所示），所述微结构包括多个长条棱镜，该长条棱镜相互平行设置，且长条棱镜的长度方向平行于侧面213。LED光源22设置在导光板21的入光面211一侧，并分成至少两个分区（图5中为四个，分别为第一分区201、第二分区202、第三分区203以及第四分区204），每个分区的LED光源22输出光线至所述入光面，以通过所述导光板的出光面212给显示面板相应位置的像素提供背光。
本发明的背光模块的导光板21的侧面213上还设置有用于吸收侧面213出光的吸光材料214，该吸光材料214可以是吸光胶带（如黑色胶带）、吸光油墨（如黑色油墨）、或吸光胶带和吸光油墨。其中黑色油墨的吸光效果较好；如先在侧面213上贴附吸光胶带，再在相应的吸光胶带上涂覆吸光油墨，这样既可以起到很好的吸光效果，又可以避免黑色油墨在导光板21上的扩散。
该吸光材料214设置在侧面213的远离LED光源22的一端，设置有吸光材料214的侧面213的长度占整个侧面213长度的10%至50%，优选设置有吸光材料214的侧面213的长度占整个侧面213长度的10%至20%。由于导光板21的侧面处的漏光主要发生在导光板21的侧面213的远光端，因此吸光材料214不必覆盖整个导光板21的侧面213，只需覆盖导光板21的侧面213长度的10%至50%即可，这样吸收侧面213出光的同时还可避免吸光材料214对导光板21中正常传播光线的吸收。下文将通过实验数据证明吸光材料214覆盖导光板21的侧面213长度的10%至20%，可对侧面处的漏光起到最大的吸收作用，因此优选设置有吸光材料214的侧面213的长度占整个侧面213长度的10%至20%，这样可最大程度的避免吸光材料214对导光板21中正常传播光线的吸收。
下面结合图5至图7说明本发明的背光模块使用过程。图6为本发明的背光模块的优选实施例的光场分布示意图，图7为本发明的背光模块的优选实施例的亮度串扰示意图。本发明的背光模块使用时，LED光源22同样被分成了第一分区201、第二分区202、第三分区203及第四分区204。当第一分区201的LED光源22点亮时，其他分区的LED光源22关闭，同时显示面板上相应位置的像素被驱动显示图像，该操作同理到其他分区的LED光源22。每帧画面通过依次驱动上述分区的LED光源22和显示面板相应位置的像素来实现相应图像的显示。
其中图6为第一分区201的LED光源22点亮，其他分区的LED光源22关闭时的光场分布示意图，图7为本发明的背光模块在实现主动快门式3D显示时的亮度串扰示意图。从图6中可见，由于第四分区204的边缘（即导光板21的一侧面213）的远光端设置有吸光材料214，整个光场呈现均匀的分布，即第一分区201至第四分区204，光场强度逐渐变弱，靠近第四分区204的侧面的远光端并不会出现漏光。
从图7中也可见，由于消除了靠近第四分区204的侧面在远光端的漏光，显示面板在该侧面的远光端附近的串扰率也大大降低，其中水平轴表示在导光板21的出光面212上沿着X’方向的出光位置（图5中所示），X’方向与入光方向垂直，垂直轴表示对应该出光位置的串扰率。这时，靠近第四分区204的侧面在远光端（图中表示为以导光板21的远光端为起点，导光板21长度的1/9处）的串扰率为未设置吸光材料214时的1/2左右（改进前该侧面在远光端的串扰率为65%，改进后该侧面在远光端的串扰率小于30%）；靠近第一分区201的侧面在远光端的串扰率为未设置吸光材料214时的1/3左右。因此设置有吸光材料214的侧面213的长度占整个侧面213长度的10%至20%即可消除50%以上的亮度串扰。这样本发明的背光模块在实现主动快门式3D显示时，导光板21的侧面213在远光端的漏光可大大减小，因此导光板21的侧面处的亮度串扰也会大大减小。
本发明还涉及一种液晶显示装置，其包括显示面板以及背光模块，显示面板包括多个用于显示图像的像素。该背光模块包括导光板以及LED光源，其中导光板包括一入光面、一出光面以及两侧面，入光面垂直于出光面，侧面分别垂直于入光面和出光面，出光面表面设置有用于会聚光线的微结构，所述微结构包括多个长条棱镜，该长条棱镜相互平行设置，且长条棱镜的长度方向平行于侧面。LED光源设置在导光板的入光面一侧，并分成至少两个分区光源，每个分区的LED光源输出光线至所述入光面，以通过所述导光板的出光面给显示面板相应位置的像素提供背光。
本发明的液晶显示装置的导光板的侧面上还设置有用于吸收侧面出光的吸光材料。该吸光材料设置在侧面的远离LED光源的一端，设置有吸光材料的侧面的长度占整个侧面长度的10%至50%，优选设置有吸光材料的侧面的长度占整个侧面长度的10%至20%。
本发明的液晶显示装置的具体实施方式和有益效果，与上述的背光模块的具体实施例中描述的相同或相似，具体请参见上述背光模块的具体实施例。
本发明的背光模块及相应的液晶显示装置结构简单、成本低，同时可以很好的减小串扰现象，解决了现有的背光模块及相应的液晶显示装置的导光板侧面在远光端处的严重漏光导致导光板的侧面处串扰现象较为严重的技术问题。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
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Claims (17)

  1. 一种背光模块，其包括：
    导光板，包括一入光面、一出光面以及两侧面，所述入光面垂直于所述出光面，所述侧面分别垂直于所述入光面和所述出光面，所述出光面上设置有用于会聚光线的微结构；以及
    LED光源，设置在所述导光板的所述入光面一侧，并分成至少两个分区，每个所述分区的所述LED光源用于输出光线至所述入光面，以通过所述导光板给显示面板相应位置的像素提供背光；
    所述微结构包括多个长条棱镜，所述长条棱镜相互平行设置，且所述长条棱镜的长度方向平行于所述侧面，所述侧面的远离所述LED光源的一端还设置有用于吸收侧面出光的吸光胶带或吸光油墨。
  2. 根据权利要求1所述的背光模块，其中设置有所述吸光胶带或吸光油墨的所述侧面的长度为整个所述侧面长度的10%至50%。
  3. 根据权利要求2所述的背光模块，其中设置有所述吸光胶带或吸光油墨的所述侧面的长度为整个所述侧面长度的10%至20%。
  4. 一种背光模块，其包括：
    导光板，包括一入光面、一出光面以及两侧面，所述入光面垂直于所述出光面，所述侧面分别垂直于所述入光面和所述出光面，所述出光面上设置有用于会聚光线的微结构，所述侧面上设置有用于吸收侧面出光的吸光材料；以及
    LED光源，设置在所述导光板的所述入光面一侧，并分成至少两个分区，每个所述分区的所述LED光源用于输出光线至所述入光面，以通过所述导光板给显示面板相应位置的像素提供背光。
  5. 根据权利要求4所述的背光模块，其中所述微结构包括多个长条棱镜，所述长条棱镜相互平行设置，且所述长条棱镜的长度方向平行于所述侧面，所述吸光材料设置在所述侧面的远离所述LED光源的一端。
  6. 根据权利要求5所述的背光模块，其中设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至50%。
  7. 根据权利要求6所述的背光模块，其中设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至20%。
  8. 根据权利要求4所述的背光模块，其中所述吸光材料为吸光胶带。
  9. 根据权利要求4所述的背光模块，其中所述吸光材料为吸光油墨。
  10. 根据权利要求4所述的背光模块，其中所述吸光材料为吸光胶带和吸光油墨。
  11. 一种液晶显示装置，其包括：
    显示面板，包括多个用于显示图像的像素；以及
    背光模块，包括：
    导光板，包括一入光面、一出光面以及两侧面，所述入光面垂直于所述出光面，所述侧面分别垂直于所述入光面和所述出光面，所述出光面上设置有用于会聚光线的微结构，所述侧面上设置有用于吸收侧面出光的吸光材料；以及
    LED光源，设置在所述导光板的所述入光面一侧，并分成至少两个分区，每个所述分区的所述LED光源用于输出光线至所述入光面，以通过所述导光板给显示面板相应位置的像素提供背光。
  12. 根据权利要求11所述的液晶显示装置，其中所述微结构包括多个长条棱镜，所述长条棱镜相互平行设置，且所述长条棱镜的长度方向平行于所述侧面，所述吸光材料设置在所述侧面的远离所述LED光源的一端。
  13. 根据权利要求12所述的液晶显示装置，其中设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至50%。
  14. 根据权利要求13所述的液晶显示装置，其中设置有所述吸光材料的所述侧面的长度为整个所述侧面长度的10%至20%。
  15. 根据权利要求11所述的液晶显示装置，其中所述吸光材料为吸光胶带。
  16. 根据权利要求11所述的液晶显示装置，其中所述吸光材料为吸光油墨。
  17. 根据权利要求11所述的液晶显示装置，其中所述吸光材料为吸光胶带和吸光油墨。
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