WO2014000324A1 - 非对称菱镜结构、导光板、背光模组及其使用 - Google Patents

非对称菱镜结构、导光板、背光模组及其使用 Download PDF

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Publication number
WO2014000324A1
WO2014000324A1 PCT/CN2012/078530 CN2012078530W WO2014000324A1 WO 2014000324 A1 WO2014000324 A1 WO 2014000324A1 CN 2012078530 W CN2012078530 W CN 2012078530W WO 2014000324 A1 WO2014000324 A1 WO 2014000324A1
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Prior art keywords
prism
asymmetric
light
guide plate
light guide
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PCT/CN2012/078530
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English (en)
French (fr)
Inventor
张光耀
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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 US13/583,227 priority Critical patent/US8858057B2/en
Publication of WO2014000324A1 publication Critical patent/WO2014000324A1/zh
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • Asymmetric prism structure, light guide plate, backlight module and use thereof is asymmetric prism structure, light guide plate, backlight module and use thereof
  • the present invention relates to liquid crystal display technology, and more particularly to an asymmetric prism structure, a light guide plate, a backlight module, and use thereof. Background technique
  • 3D LCD TVs there is a kind of shutter glass 3D display technology is the most commonly used technology at present. It uses the backlight partition to flash, separately display the signals of the left and right eyes, and then with the synchronized blinking glasses, you can see the left and right eyes. Different images.
  • the shutter type 3D display technology utilizes image processing technology to make the human eye feel the general visual effect like a stereoscopic image, and mainly includes: alternately outputting left and right eye image frame signals to the liquid crystal panel, respectively driving the liquid crystal panel to form a left,
  • the image of the right eye combined with the illumination of the scanning backlight module (scanning BLU) and the timing control of the shutter glass, causes the left and right eye signals to stimulate the left and right eyes respectively, thereby making the 3D image feelable.
  • the liquid crystal 3D display has a disadvantage: Since the liquid crystal panel itself does not emit light, it is necessary to use the backlight as a light source, and the backlight partition cannot be made too fine due to cost factors.
  • Fig. 1 it is a schematic diagram of the illumination and light leakage of the existing side-entry LED backlight.
  • the side-in LED backlight is configured by arranging the LED die on the peripheral edge of the liquid crystal panel, and then using the light guide plate to illuminate the LED backlight partition, and transmitting the light emitted from the edge of the liquid crystal panel to the center of the liquid crystal panel through the light guide plate. Go, so that there is enough backlight in the whole, which allows the LCD panel to display the picture.
  • LED backlights There are two advantages of side-lit LED backlights: one is that fewer LEDs can be used to save cost; the other is to create a slimmer body, so that LED modules are not required behind the LED TV LCD panel. , but placed on the side, can reduce the overall thickness of the LCD panel, the body can be very thin.
  • the backlight partition 11 in Fig. 1 is the short-side light entering the right side, and the reason why the light leakage is asymmetric is that the farther the light path is, the more serious the light leakage is.
  • the backlight partition 11 When the backlight partition 11 is lit, the light will leak to the areas 12 and 13 on both sides, which will cause the left and right eye signals to interfere with each other, that is, the left eye sees the signal of the right eye (or the right eye sees the signal of the left eye), so that The image is blurred (because the two signals have a spatially misaligned distribution).
  • the evaluation standard of image blur is cross-talk, and the larger the value, the more serious the left and right eye image interference. Therefore, how to reduce crosstalk while maintaining product price competitiveness is an important issue at present.
  • the existing shutter type 3D display technology has crosstalk between the left eye signal and the right eye signal, which is determined by its technical characteristics.
  • the backlight module of the existing shutter type liquid crystal 3D display is divided into upper and lower backlight partitions according to the horizontal block, and the backlight partitions of the backlight module are sequentially controlled and operated according to the scanning method from top to bottom.
  • the image signal (left eye signal or right eye signal) sequentially supplies the required driving voltage for each column of the liquid crystal panel from top to bottom. After the pixel is charged by the driving voltage, the liquid crystal panel starts to react, due to pixel design and liquid crystal adhesion.
  • the hysteresis characteristic requires a liquid crystal reaction time to fully reach the desired steady state.
  • the image signal is displayed on the liquid crystal panel by using a zone scan.
  • the corresponding backlight partition is lit, and the remaining backlight partitions are turned off;
  • the left eye image is simultaneously generated in the eye.
  • crosstalk is generated.
  • FIG. 2A and FIG. 2B it is a schematic diagram of the backlight partitioning of the existing 46-inch single short-side side-entry LED TV.
  • the backlight module 20 is usually divided into an even number of four backlight partitions for lighting. After the edge backlight partition 21 is lit, light is leaked to the middle; when the middle backlight partition 22 is lit, light is leaked to both sides.
  • FIG. 3 it is a schematic diagram of the position of the string value of the nine points on the liquid crystal display.
  • the dimensions of the adjacent sides of the display screen 30 are respectively recorded as H and V, and the points 1 and 2 ⁇ 9 on the display screen 30 are distributed according to the relative positions indicated in Fig. 3, point 1, point 2 ⁇ 9
  • the position on the display is the position on the LCD panel.
  • the measurement results of nine point crosstalk values such as point 1, point 2 ⁇ 9 are as shown in Table 1 below, and the crosstalk is asymmetrical.
  • the characteristics are serious above and slightly below; crosstalk also exhibits left and right asymmetry. This is because of the influence of light entering the short side, the farther the light path is, the more serious the light leakage is.
  • the timing of the liquid crystal panel signal, the mirror signal and the backlight module often cause crosstalk to be asymmetric.
  • the image quality of the left eye signal or the right eye signal in the middle of the liquid crystal panel is relatively best, on the liquid crystal panel.
  • the image quality is asymmetrical.
  • Crosstalk in Table 1 Up and down asymmetry can be explained by the timing relationship between the backlight partition and the liquid crystal panel signals. As shown in FIG.
  • the backlight module is divided into a first backlight partition 41, a second backlight partition 42, a third backlight partition 43, and a fourth backlight partition 44 from top to bottom, respectively for respectively illuminating the first display partition of the liquid crystal panel 40, and the second The display partition, the third display partition, and the fourth display partition.
  • Figure 4 shows the four steps of the liquid crystal panel 40 and the backlight module displaying the liquid crystal panel signals by taking the left eye signal as an example: Step a , the first to third display partitions load the current frame left eye signal, and the fourth display partition Loading the previous frame of the right eye signal, the first backlight partition 41 is lit to illuminate the first display partition, because the light leakage of the first backlight partition 41 may illuminate the fourth display partition, and the previous frame loaded by the fourth display partition at this time
  • the right eye signal is an error signal of the left eye signal crosstalk of the current frame loaded with the first display partition.
  • Step b The fourth display partition loads the current frame left eye signal. At this time, the entire left eye signal is loaded on the entire liquid crystal panel 40, and the second backlight partition 42 is lit to illuminate the second display partition. At this time, the second backlight partition 42 is Leakage does not cause crosstalk between left and right eye signals, and image quality is best; Step c, the first display partition is loaded with one frame of right eye signal, and the second to fourth display partitions are loaded.
  • the frame left eye signal, the third backlight partition 43 is lit to illuminate the third display partition, and the next frame of the right eye signal loaded by the first display partition is the error of the left eye signal crosstalk of the current frame loaded with the third display partition.
  • the first and second display partitions are loaded with a frame of the right eye signal, the third and the third
  • the fourth display partition loads the current frame left eye signal, and the fourth backlight partition 44 lights up to illuminate the fourth display partition, and the next frame of the right eye signal loaded by the first and second display partitions is loaded with the fourth display partition.
  • the error signal of the left-eye signal crosstalk of the current frame because the first and second display partitions are separated from the fourth display partition by one display partition, the distance is relatively close, and the crosstalk is serious at this time.
  • the right eye signal (previous frame), the left eye signal (current frame), the right eye signal (the next frame), the left eye signal, and the right eye signal are repeatedly loaded on the liquid crystal panel 40. ..the process of. Since the existing side-entry backlight partition is an even partition, when the error signal appears, the influence on the top to bottom is different. In this example, the backlight partition lighting time is closer to the upper error signal, and the crosstalk above the liquid crystal panel 40 is relatively higher.
  • the liquid crystal panel 40 has an asymmetrical crosstalk. If the liquid crystal panel signal is directly adjusted so that the backlight partition is lit at the center of the liquid crystal panel signal, although the vertical crosstalk of the liquid crystal panel 40 can be made close to symmetry, since the backlight partition is even, the image quality at the center position is sacrificed, and the crosstalk becomes large.
  • FIG. 5A and FIG. 5B it is a schematic diagram of the light propagation distance of the existing prism-shaped light guide plate, and FIG. 5A is a stereoscopic diagram.
  • Fig. 5B is a side view.
  • the design of the conventional prism-shaped light guide plate 50 utilizes a symmetrical prism structure so that the light 52 in the direction of the parallel mirror 51 can be transmitted further, and the total internal reflection (T.LR) is easy; the light 53 perpendicular to the direction 51 of the mirror is The transmission is limited, and the total internal reflection is difficult, so the result of the light pattern convergence is achieved.
  • T.LR total internal reflection
  • FIG. 6 it is a schematic diagram of the difference in light convergence between the flat plate and the existing prism-shaped light guide plate.
  • the left side is a light pattern diagram of the flat plate 61
  • the right side is a light pattern diagram of the prism mirror light guide plate 62 , which shows light convergence.
  • the present invention provides an asymmetric prism structure, which comprises a plurality of asymmetric prisms arranged in parallel according to a direction of a prism, the asymmetric prism being formed by a side of the first prism, a side of the second prism, and a mirror
  • the bottom surface is composed of: the asymmetric prism is configured to: for the light perpendicular to the direction of the prism, the side of the first mirror restricts the light from propagating toward the side of the side of the first mirror, the second The side of the prism allows the light to propagate toward the side of the side of the second mirror.
  • the sides of the two prisms correspond to the two sides of the triangle of the section
  • the bottom surface of the prism corresponds to the bottom edge of the triangle of the section
  • the present invention also provides a light guide plate, the surface of which includes an asymmetric prism structure as described above.
  • the invention also provides a backlight module comprising the above-mentioned light guide plate.
  • the present invention also provides a light guide plate having a surface including a symmetrical prism structure and an asymmetric prism structure as described above.
  • the invention also provides a backlight module comprising the above-mentioned light guide plate.
  • the present invention also provides the use of the asymmetric prism structure as described above.
  • the asymmetric mirror structure is used on the light guide plate to reduce the error signal close to one. Side crosstalk.
  • the asymmetric prism structure, the light guide plate or the backlight module of the invention makes the light convergence condition different from the existing prismatic light guide plate, and the asymmetric prism structure, the light guide plate or the backlight module of the invention is used in the backlight scanning and the liquid crystal panel
  • the asymmetric prism structure can be used to reduce the crosstalk of the error signal near one side and improve the quality of influence.
  • FIG. 1 is a schematic diagram of light-emitting and light leakage of a conventional side-entry LED backlight
  • FIGS. 2A and 2B are schematic diagrams showing the backlight partitioning of a conventional 46-inch single short-side side-entry LED television
  • Figure 3 is a schematic diagram showing the position of the string value of the nine points on the display screen
  • Figure 4 is a schematic diagram showing the timing relationship (left eye signal) of the backlight partition of the existing 46-inch single short-side side-entry LED TV and the signal of the liquid crystal panel;
  • FIG. 5A and FIG. 5B are schematic diagrams showing light propagation distances on a conventional prism-shaped light guide plate;
  • FIG. 6 is a schematic diagram showing differences in light pattern convergence between a flat plate and a conventional prism-shaped light guide plate;
  • FIG. 7A is an asymmetric prism structure of the present invention;
  • FIG. 7B is a schematic structural view of another embodiment of an asymmetric prism structure according to the present invention;
  • FIG. 8A is a schematic plan view showing a light path of a light guide plate of an asymmetric prism structure according to the present invention;
  • the asymmetric prism structure of the present invention comprises a plurality of asymmetric prisms arranged in parallel according to the direction of the prism, the asymmetric prism being composed of a side of the first prism, a side of the second mirror and a bottom surface of the prism, the asymmetry
  • the prism is configured to: for the light perpendicular to the direction of the prism, the side of the first mirror restricts light from propagating toward the side of the side of the first mirror, and the side of the second mirror allows light to face the second mirror Spread on the side of the side.
  • the sides of the two prisms correspond to the sides 71 and 72 of the section triangle
  • the bottom surface of the prism corresponds to the bottom edge 73 of the section triangle.
  • the shape of the cross-section triangle satisfies: the projection of the side edges 71 and 72 on the bottom edge falls on the bottom edge 73, and the projection lengths of the side edges 71 and 72 on the bottom edge 73 are pi and p2, respectively, pl>3xp2 Or p2>3xpl.
  • Fig. 7A there is shown a structural schematic view of still another preferred embodiment of the asymmetric prism structure of the present invention.
  • the side edges 74 and 75 are the hypotenuse and the right-angled side of the right-angled triangle, that is, the projection of the side 74 is the bottom edge 76.
  • Fig. 7 ⁇ when pi or ⁇ 2 is 0, it is the state shown in Fig. 7 ⁇ .
  • the present invention also provides a light guide plate, the surface of which includes an asymmetric prism structure as described above.
  • the invention also provides a corresponding backlight module, including the aforementioned light guide plate. See picture 8A and FIG. 8B, FIG. 8A is a schematic plan view of a light path of a light guide plate of an asymmetric prism structure according to the present invention, and FIG. 8B is a perspective view showing a light path of a light guide plate of an asymmetric prism structure according to the present invention.
  • the light guide plate of the present invention has an asymmetric prism structure.
  • the side of the first prism restricts the light from propagating toward the side of the side of the first mirror.
  • the light on this side is mainly in the form of total internal reflection
  • the side of the second prism allows light to propagate toward the side of the side of the second prism, and the light on this side is mainly in the form of light leakage.
  • the light guide plate 81 since the light guide plate 81 has an asymmetric prism structure 82, the light rays 83 in the direction of the parallel mirror can transmit farther, and the total internal reflection (T.LR) is easy; on one side, perpendicular to the direction of the mirror The light rays 84, the transmission is limited, and the result of the light pattern convergence is reached; on the other side, the light rays 85 perpendicular to the direction of the prisms travel a long distance.
  • the light guide plate 81 of the present invention converges on the side light type and the other side light pattern diverge.
  • the present invention also provides a light guide plate having a surface comprising a symmetric prism structure on an existing prismatic light guide plate and an asymmetric prism structure of the present invention.
  • the present invention also provides a corresponding backlight module, including the aforementioned light guide plate.
  • the present invention also provides the use of the asymmetric prism structure as described above.
  • the present invention can be used on the light guide plate.
  • the inventive asymmetric mirror structure mitigates crosstalk from the side of the error signal.
  • the asymmetric prism structure, the light guide plate or the backlight module of the present invention makes the light convergence condition different from the existing prism mirror type light guide plate, and the asymmetric prism structure, the light guide plate or the backlight module of the invention is
  • the asymmetric prism structure can be used to reduce the crosstalk of the error signal close to one side and improve the quality of influence.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Description

非对称菱镜结构、 导光板、 背光模组及其使用
技术领域
本发明涉及液晶显示技术， 尤其涉及一种非对称菱镜结构、 导光板、 背光模组及其使用。 背景技术
随著 LED 电视快速发展， 其即将进入另一个阶段—— 3D 液晶电 视。 3D 液晶电视中， 有一种快门式 （shutter glass ) 3D 显示技术是目前 最普遍使用的技术， 其利用背光分区闪烁， 分开显示左右眼的信号， 再搭 配同步闪烁的眼镜， 即可使左右眼看到不同的影像。 快门式 3D显示技术 利用影像处理技术， 使人眼感受如同立体影像一般的视觉效果， 主要包 括： 使左、 右眼图像帧 （frame )信号交替输出至液晶面板， 驱动液晶面板 上分别形成左、 右眼图像， 配合扫描式背光模组（scanning BLU ) 的照射 加上快门眼镜 ( shutter glass ) 的时序控制， 使左、 右眼信号分别刺激左、 右眼， 从而使人感受 3D图像。
然而， 液晶 3D 显示器有一个缺点： 由于液晶面板本身不发光， 必须 利用背光当作光源， 因成本因素， 背光分区不能做的太细致。 如图 1 所 示， 其为现有侧入式 LED 背光分区点亮及漏光示意图。 侧入式 LED 背 光， 是把 LED 晶粒配置在液晶面板的四周边缘， 再搭配导光板， 让 LED 背光分区点亮时， 把从液晶面板边缘发射的光通过导光板输送到液晶面板 中央的区域去， 这样整体就有足够的背光量， 可让液晶面板显示画面。 侧 入式 LED背光的好处有两个： 其一是可使用较少颗的 LED晶粒， 节省成 本； 其二就是能够打造比较轻薄的机身， 让 LED 电视液晶面板的后方不 需要配置 LED模块， 而是放置在侧边， 可减少液晶面板整体的厚度， 机 身能很薄。
图 1 中的背光分区 11为右侧短边入光， 漏光左右非对称的原因在于 光路径愈远漏光愈严重。 当背光分区 11 点亮时， 光线会漏到其两侧的区 域 12 和 13 , 进而会造成左右眼信号互相干扰， 即左眼看到右眼的信号 (或右眼看到左眼的信号） ， 使影像模糊（因为两个信号有空间错位的分 布）。 影像模糊的评定标准为串扰（Cross-talk ) , 其值愈大表示左右眼影 像干扰愈严重。 因此如何降低串扰， 同时保持产品价格竟争力， 是目前重 要课题。 现有快门式 3D 显示技术在左眼信号和右眼信号之间存在串扰现象， 是由其技术特性所决定的。 现有快门式液晶 3D显示器的背光模组是按水 平区块上下作区隔成为偶数个背光分区， 按扫描方式由上往下依序控制背 光模组的各背光分区开启及工作时间。 图像信号 （左眼信号或右眼信号） 依序由上而下给与液晶面板各列所需驱动电压， 像素在收到驱动电压充电 后， 液晶面板才开始反应， 由于像素设计及液晶的粘滞特性， 需要一段液 晶反应时间才能完全达到所需稳定态。 由于液晶反应緩慢， 图像信号在液 晶面板上釆用分区扫描的方式显示， 当扫描液晶面板上任一区图像信号 时， 对应的背光分区点亮， 其余背光分区关闭； 由于背光分区存在漏光， 因此当对应左眼信号的背光分区的漏光照射到对应右眼信号的背光分区时 (或对应右眼信号的背光分区的漏光照射到对应左眼信号的背光分区 时） ， 眼中就会同时产生左眼图像与右眼图像， 产生了串扰， 我们可以将 引起串扰的右眼信号或左眼信号称为错误信号 （也可称为干扰信号） 。
如图 2A及图 2B所示， 其为现有 46寸单短边侧入式 LED电视的背光 分区点亮情形示意图。 以现有 46寸单短边侧入式 LED电视为例， 其背光 模组 20通常分成偶数个如四个背光分区进行点亮。 边缘背光分区 21点亮 后， 向中间漏光； 中间背光分区 22点亮后， 会向其两侧漏光。
如图 3 所示， 其为量测液晶显示屏上九点的串 4尤值的位置示意图。 图 3 中， 显示屏 30相邻两侧边的尺寸分别记为 H和 V, 显示屏 30上的点 1、 点 2 ^ 9按图 3中标示的相对位置分布， 点 1、 点 2 ^ 9在显 示屏上的位置即为液晶面板上的位置。 通过对现有的 46寸单短边入光、 4 背光分区扫描的 LED 电视进行测量， 点 1、 点 2 ^ 9等九个点串扰值 测量结果如下面表一所示， 串扰呈现上下非对称的特点， 上方严重， 下方 轻微； 串扰还呈现左右非对称的特点， 这是因为单短边入光的影响， 光路 径愈远， 漏光愈严重。
、 九点串扰量测值 (46寸单短边入光， 4背光分区扫描)
Figure imgf000003_0001
由于背光分区设计， 液晶面板信号、 目艮镜信号、 背光模组三者时序搭 配， 常会造成串扰非对称的现象。 由表一的数据可以看出， 对于现有的 46 寸单短边侧入式 LED 电视来说， 左眼信号或右眼信号在液晶面板中部的 图像质量相对来说最好， 在液晶面板上图像质量上下非对称。 表一中串扰 上下非对称可以用背光分区和液晶面板信号的时序关系做解释。 如图 4所 示， 其为现有 46 寸单短边侧入式 LED 电视的背光分区和液晶面板信号 (液晶面板上的左眼图像信号或右眼图像信号） 的时序关系 （左眼信号） 示意图。 背光模组由上至下顺序分成第一背光分区 41、 第二背光分区 42、 第三背光分区 43及第四背光分区 44, 分别用于对应照亮液晶面板 40 的第一显示分区、 第二显示分区、 第三显示分区及第四显示分区。 图 4 以 左眼信号为例显示了液晶面板 40及背光模组显示液晶面板信号时的连续 四个操作步骤： 步骤 a、 第一至第三显示分区加载当前帧左眼信号， 第四 显示分区加载前一帧右眼信号， 第一背光分区 41 点亮以照亮第一显示分 区， 由于第一背光分区 41 的漏光可能照亮第四显示分区， 此时第四显示 分区加载的前一帧右眼信号为与第一显示分区加载的当前帧左眼信号串扰 的错误信号， 由于第一显示分区与第四显示分区之间相隔两个显示分区， 距离较远， 此时串扰轻微； 步骤 b、 第四显示分区加载当前帧左眼信号， 此时整个液晶面板 40上加载了完整的左眼信号， 第二背光分区 42点亮以 照亮第二显示分区， 此时第二背光分区 42 的漏光不会引起左右眼信号之 间的串扰， 影像品质最好； 步骤 c、 第一显示分区加载后一帧右眼信号， 第二至第四显示分区加载当前帧左眼信号， 第三背光分区 43 点亮以照亮 第三显示分区， 此时第一显示分区加载的后一帧右眼信号为与第三显示分 区加载的当前帧左眼信号串扰的错误信号， 由于第一显示分区与第三显示 分区之间相隔一个显示分区， 距离较近， 此时串扰严重； 步骤 d、 第一和 第二显示分区加载后一帧右眼信号， 第三和第四显示分区加载当前帧左眼 信号， 第四背光分区 44 点亮以照亮第四显示分区， 此时第一和第二显示 分区加载的后一帧右眼信号为与第四显示分区加载的当前帧左眼信号串扰 的错误信号， 由于第一和第二显示分区与第四显示分区之间间隔一个显示 分区， 距离较近， 此时串扰严重。 整个 3D显示过程中， 液晶面板 40上会 重复加载右眼信号 （前一帧） 、 左眼信号 （当前帧） 、 右眼信号 （后一 帧） 、 左眼信号、 右眼信号 ... ...的过程。 由于现有的侧入式背光分区为偶 数分区， 当错误信号出现时， 对上对下的影响不同， 在这个例子中， 背光 分区点亮时间较接近上方的错误信号， 液晶面板 40 上方串扰较为严重， 液晶面板 40 上下串扰不对称。 若直接将液晶面板信号调整， 使背光分区 点亮在液晶面板信号的中心， 虽然可以使液晶面板 40 上下串扰接近对 称， 但因为背光分区为偶数， 会牺牲中心位置的影像品质， 串扰变大。
现有液晶 3D显示器通常都用到菱镜式导光板。 如图 5A及图 5B 所 示， 其为现有菱镜式导光板上光线传播距离示意图， 图 5A 为立体示意 图， 图 5B为侧视图。 传统菱镜式导光板 50的设计， 利用对称菱镜结构， 使平行菱镜方向 51的光线 52可以传递更远， 全内反射（T.LR )容易； 垂 直于菱镜方向 51 的光线 53 , 传递受限， 全内反射困难， 因此达到光型收 敛的结果。 如图 6所示， 其为平板和现有菱镜式导光板光型收敛状况的差 异示意图， 左面为平板 61 的光型示意图， 右面为菱镜式导光板 62的光型 示意图， 表现出光收敛情况在平板 61和菱镜式导光板 62上的差别。 发明内容
因此， 本发明的目的在于提出一种使光收敛状况不同于现有菱镜式导 光板的新型的非对称菱镜结构， 以及导光板、 背光模组及其使用。
为实现上述目的， 本发明提供一种非对称菱镜结构， 包括按菱镜方向 平行排列多个非对称菱镜， 该非对称菱镜由第一菱镜侧面、 第二菱镜侧面 和菱镜底面连接组成， 该非对称菱镜配置为： 对于垂直于菱镜方向的光线 来说， 所述第一菱镜侧面限制所述光线朝该第一菱镜侧面所在一侧传播， 所述第二菱镜侧面允许所述光线朝该第二菱镜侧面所在一侧传播。
其中， 对于利用垂直于菱镜方向的平面截取该非对称菱镜获得的截面 三角形来说， 两棱镜侧面对应于该截面三角形的两侧边， 菱镜底面对应于 该截面三角形的底边， 该截面三角形的形状满足： 两侧边在底边上的投影 落在底边上， 两侧边在底边上的投影长度分别为 pi和 p2, pl>3xp2„ 其中， 所述 pi或 p2为 0。
本发明还提供一种导光板， 该导光板的表面包括如上所述的非对称菱 镜结构。
本发明还提供一种背光模组， 包括上述的导光板。
本发明还提供一种导光板， 该导光板的表面包括对称棱镜结构和如上 所述的非对称棱镜结构。
本发明还提供一种背光模组， 包括上述的导光板。
本发明还提供如上所述的非对称菱镜结构的使用， 当背光扫描与液晶 面板信号时序安排存在上下不对称的情况时， 在导光板上使用所述非对称 菱镜结构减轻错误讯号靠近一侧的串扰。
本发明的非对称菱镜结构、 导光板或背光模组使光收敛状况不同于现 有菱镜式导光板， 本发明的非对称菱镜结构、 导光板或背光模组在背光扫 描与液晶面板信号时序安排需要有上下不对称的情况时， 利用非对称的菱 镜结构， 可以减轻错误信号靠近一侧的串扰， 提升影响品质。 附图说明
下面结合附图， 通过对本发明的具体实施方式详细描述， 将使本发明 的技术方案及其他有益效果显而易见。
附图中，
图 1为现有侧入式 LED背光分区点亮及漏光示意图；
图 2A及图 2B为现有 46寸单短边侧入式 LED电视的背光分区点亮情 形示意图；
图 3为量测显示屏上九点的串 4尤值的位置示意图；
图 4为现有 46寸单短边侧入式 LED电视的背光分区和液晶面板信号 的时序关系 （左眼信号）示意图；
图 5A及图 5B为在现有菱镜式导光板上光线传播距离示意图； 图 6为平板和现有菱镜式导光板光型收敛状况的差异示意图； 图 7A为本发明非对称菱镜结构一较佳实施例的结构示意图； 图 7B为本发明非对称菱镜结构又一较佳实施例的结构示意图； 图 8A为本发明非对称菱镜结构的导光板的光线路径平面示意图； 图 8B为本发明非对称菱镜结构的导光板的光线路径立体示意图。 具体实施方式
参见图 7A, 其为本发明非对称菱镜结构一较佳实施例的结构示意 图。 本发明的非对称菱镜结构， 包括按菱镜方向平行排列多个非对称菱 镜， 该非对称菱镜由第一菱镜侧面、 第二菱镜侧面和菱镜底面连接组成， 该非对称菱镜配置为： 对于垂直于菱镜方向的光线来说， 所述第一菱镜侧 面限制光线朝该第一菱镜侧面所在一侧传播， 第二菱镜侧面允许光线朝该 第二菱镜侧面所在一侧传播。 对于利用垂直于菱镜方向的平面截取该非对 称菱镜获得的截面三角形来说， 两棱镜侧面对应于该截面三角形的两侧边 71 和 72, 菱镜底面对应于该截面三角形的底边 73 , 该截面三角形的形状 满足： 两侧边 71和 72在底边上的投影落在底边 73上， 两侧边 71和 72 在底边 73上的投影长度分别为 pi和 p2, pl>3xp2或 p2>3xpl。
参见图 7Β, 其为本发明非对称菱镜结构又一较佳实施例的结构示意 图。 此时， 两侧边 74和 75分别为直角三角形的斜边和一直角边， 也就是 侧边 74的投影即为底边 76。 图 7Α中 pi或 ρ2为 0的时候即是图 7Β所示 状态。
本发明还提供了一种导光板， 该导光板的表面包括如上所述的非对称 菱镜结构。 本发明还提供了相应的背光模组， 包括前述的导光板。 参见图 8A及图 8B, 图 8A为本发明非对称菱镜结构的导光板的光线路径平面示 意图， 图 8B 为本发明非对称菱镜结构的导光板的光线路径立体示意图。 如图 8A 所示， 在本发明的导光板上由于具有非对称菱镜结构， 对于垂直 于菱镜方向的光线来说， 第一菱镜侧面限制光线朝该第一菱镜侧面所在一 侧传播， 这一侧的光线主要为全内反射形式， 第二菱镜侧面允许光线朝该 第二菱镜侧面所在一侧传播， 这一侧的光线主要为漏光形式。 如图 8B 所 示， 由于导光板 81上具有非对称菱镜结构 82, 平行菱镜方向的光线 83可 以传递更远， 全内反射 （T.LR ) 容易； 在一侧， 垂直于菱镜方向的光线 84, 传递受限， 达到光型收敛的结果； 在另一侧， 垂直于菱镜方向的光线 85传播距离远。 与现有对称菱镜式导光板不同， 本发明的导光板 81 —侧 光型收敛， 另一侧光型发散。
本发明还提供了一种导光板， 该导光板的表面包括现有菱镜式导光板 上的对称棱镜结构和本发明的非对称棱镜结构。 本发明还提供了相应的背 光模组， 包括前述的导光板。
本发明还提供如上所述的非对称菱镜结构的使用， 对于类似图 4 中所 示的情况， 当背光扫描与液晶面板信号时序安排存在上下不对称的情况 时， 在导光板上可以使用本发明的非对称菱镜结构来减轻错误讯号靠近一 侧的串扰。
综上所述， 本发明的非对称菱镜结构、 导光板或背光模组使光收敛状 况不同于现有菱镜式导光板， 本发明的非对称菱镜结构、 导光板或背光模 组在背光扫描与液晶面板信号时序安排需要有上下不对称的情况时， 利用 非对称的菱镜结构， 可以减轻错误信号靠近一侧的串扰， 提升影响品质。
以上所述， 对于本领域的普通技术人员来说， 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形， 而所有这些改变和变形 都应属于本发明后附的权利要求的保护范围。

Claims

权 利 要 求
1、 一种非对称菱镜结构， 包括按菱镜方向平行排列多个非对称菱 镜， 该非对称菱镜由第一菱镜侧面、 第二菱镜侧面和菱镜底面连接组成， 该非对称菱镜配置为： 对于垂直于菱镜方向的光线来说， 所述第一菱镜侧 面限制所述光线朝该第一菱镜侧面所在一侧传播， 所述第二菱镜侧面允许 所述光线朝该第二菱镜侧面所在一侧传播。
2、 如权利要求 1 所述的非对称菱镜结构， 其中， 对于利用垂直于菱 镜方向的平面截取该非对称菱镜获得的截面三角形来说， 两棱镜侧面对应 于该截面三角形的两侧边， 菱镜底面对应于该截面三角形的底边， 该截面 三角形的形状满足： 两侧边在底边上的投影落在底边上， 两侧边在底边上 的投影长度分别为 pi和 p2, pl>3 p2。
3、 如权利要求 1所述的非对称菱镜结构， 其中， 所述 pi或 p2为 0。
4、 一种导光板， 该导光板的表面包括如权利要求 1 所述的非对称菱 镜结构。
5、 一种导光板， 该导光板的表面包括对称棱镜结构和如权利要求 1 所述的非对称棱镜结构。
6、 一种背光模组， 包括如权利要求 4所述的导光板。
7、 一种背光模组， 包括如权利要求 5所述的导光板。
8、 如权利要求 1 所述的非对称菱镜结构的使用， 其中， 当背光扫描 与液晶面板信号时序安排存在上下不对称的情况时， 在导光板上使用所述 非对称菱镜结构减轻错误讯号靠近一侧的串扰。
PCT/CN2012/078530 2012-06-28 2012-07-12 非对称菱镜结构、导光板、背光模组及其使用 Ceased WO2014000324A1 (zh)

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