WO2014000325A1 - 侧入式非均匀占空比背光驱动方法 - Google Patents

侧入式非均匀占空比背光驱动方法 Download PDF

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Publication number
WO2014000325A1
WO2014000325A1 PCT/CN2012/078532 CN2012078532W WO2014000325A1 WO 2014000325 A1 WO2014000325 A1 WO 2014000325A1 CN 2012078532 W CN2012078532 W CN 2012078532W WO 2014000325 A1 WO2014000325 A1 WO 2014000325A1
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Prior art keywords
backlight
duty cycle
partition
edge
type
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Ceased
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PCT/CN2012/078532
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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 US13/635,404 priority Critical patent/US20140002769A1/en
Publication of WO2014000325A1 publication Critical patent/WO2014000325A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

Definitions

  • the present invention relates to liquid crystal display technology, and more particularly to a side-entry non-uniform duty cycle backlight driving method. 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 light leakage of the backlight partition corresponding to the left eye signal is irradiated to the backlight partition corresponding to the right eye signal
  • the left eye image and the right eye image are simultaneously generated in the eye, and crosstalk is generated.
  • the left eye signal is called an error signal (also called an interference signal).
  • 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 glasses signal, and the backlight scanning 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, and in the liquid crystal panel.
  • the upper image quality is asymmetrical.
  • Table A crosstalk up and down asymmetry can be explained by the timing relationship between the backlight partition and the liquid crystal panel signal. 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. Summary of the invention Therefore, the object of the present invention is to determine the influence of each backlight partition on crosstalk by using the liquid crystal panel signal and the backlight partition scanning timing, and improve the crosstalk display quality by changing the backlight partition driving duty ratio.
  • the present invention provides a side-entry non-uniform duty cycle backlight driving method, including:
  • Step 1 Before the actual backlight driving, according to the predetermined liquid crystal panel signal and the backlight scanning timing, simulate the process of driving the side-in backlight module according to the uniform duty ratio mode;
  • Step 2 Analyze the number of interference signal regions and the interference signal distance that occur when each backlight partition is lit during the analog driving side-entry backlight module, and sort the backlight partitions according to the degree of crosstalk caused by the interference signals when each backlight partition is lit. , backlight partitions with a small degree of crosstalk are sorted first;
  • Step 3 When the side-lit backlight module is actually driven, it is driven according to a predetermined liquid crystal panel signal and a backlight scanning timing, and a higher backlight driving duty ratio is allocated when the preceding backlight partition is lit.
  • the backlight when the number of backlight partitions of the side-lit backlight module is an odd number, the backlight is maintained in the middle of the liquid crystal panel signal when lighting, so as to minimize crosstalk.
  • the driving duty ratio is the third backlight partition, and the driving duty ratio is the second largest.
  • the second and fourth backlight partitions, the third largest driving duty ratio, are the first and fifth backlight partitions.
  • the backlight when the number of backlight partitions of the side-lit backlight module is an even number, the backlight is illuminated to maintain the second area of the liquid crystal panel signal to minimize center crosstalk.
  • the driving duty ratio is the second backlight partition, and the driving duty ratio is the second largest.
  • the first backlight partition, the third driving partition of the driving duty ratio is the third backlight partition, and the driving duty ratio is the fourth largest is the fourth backlight partition.
  • the liquid crystal panel signal is a left eye liquid crystal panel signal or a right eye liquid crystal panel signal.
  • the side-lit backlight module has a single short-side light input.
  • the side-in type backlight module is a double short-side light input.
  • the present invention also provides a side-entry non-uniform duty cycle backlight driving method, comprising: Step 1. Before performing actual backlight driving, simulate driving side according to a predetermined duty ratio according to a predetermined liquid crystal panel signal and backlight scanning timing The process of entering the backlight module;
  • Step 2 Analyze the number of interference signal regions and the interference signal distance that occur when each backlight partition is lit during the analog driving side-entry backlight module, and sort the backlight partitions according to the degree of crosstalk caused by the interference signals when each backlight partition is lit. , backlight partition sorting with less crosstalk in front;
  • Step 3 When the side-lit backlight module is actually driven, according to a predetermined liquid crystal panel signal and a backlight scanning timing driving, a higher backlight driving duty ratio is allocated when the preceding backlight partition is lit;
  • the backlight when the number of backlight partitions of the side-lit backlight module is an odd number, the backlight is maintained in the middle of the liquid crystal panel signal to minimize crosstalk;
  • the driving duty ratio is the third backlight partition, and the driving duty ratio is the second largest.
  • the second and fourth backlight partitions, the third largest driving duty ratio is the first and fifth backlight partitions;
  • the liquid crystal panel signal is a left eye liquid crystal panel signal
  • the side-lit backlight module has a single short-side light input.
  • the side-entry non-uniform duty cycle backlight driving method of the present invention improves the crosstalk and improves the display quality by using a backlight driving method with a non-uniform duty ratio in a backlight module having a scanning function.
  • 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 timing diagrams of signal scanning and backlight scanning of a liquid crystal panel according to a preferred embodiment of the present invention.
  • the number of backlight partitions in FIG. 5A is an odd number, and the number of backlight partitions in FIG. 5B is an even number;
  • FIG. 6 is a schematic diagram of a uniform duty ratio and a modified relative duty ratio according to a preferred embodiment of the present invention.
  • the upper side is an odd number 5 backlight partition, and the lower side is an even number 4 backlight partition;
  • FIG. ⁇ is a flowchart of a side-input non-uniform duty cycle backlight driving method of the present invention. detailed description
  • Step 1 Before performing actual backlight driving, according to a predetermined liquid crystal panel signal and backlight scanning timing, simulate according to a uniform duty ratio mode. The process of driving the side-lit backlight module; Step 2: Analyze the number of interference signal regions and the interference signal distance that occur when each backlight partition is lit during the analog driving side-entry backlight module, and sort the backlight partitions according to the degree of crosstalk caused by the interference signals when each backlight partition is lit. , backlight partitions with a small degree of crosstalk are sorted first;
  • Step 3 When the side-lit backlight module is actually driven, it is driven according to a predetermined liquid crystal panel signal and a backlight scanning timing, and a higher backlight driving duty ratio is allocated when the preceding backlight partition is lit.
  • the side-entry backlight module can be a single short-side light input or a double short-edge light input.
  • the LED backlight driving of the existing liquid crystal display generally adopts a PWM (Pulse Width Modulation) method, and by adjusting the driving duty ratio, parameters such as backlight brightness can be adjusted.
  • PWM Pulse Width Modulation
  • the backlight driving method with uneven duty ratio is used to improve crosstalk and increase display quality.
  • FIG. 5A and FIG. 5B are timing diagrams of signal scanning and backlight scanning of a liquid crystal panel according to a preferred embodiment of the present invention.
  • the number of backlight partitions in FIG. 5A is an odd number
  • the number of backlight partitions in FIG. 5B is an even number.
  • FIG. 6 is a preferred embodiment of the present invention. In the example, the uniform duty ratio and the modified relative duty ratio are shown in the figure. In Fig. 6, the upper part is an odd number 5 backlight partition, and the lower side is an even number 4 backlight partition.
  • the number of partitions is odd, the left and right eye LCD panel signals are arranged in order, the left and right eye signals are marked by brackets, and when the backlight is lit, the selection is maintained in the middle of the liquid crystal panel signal to minimize crosstalk.
  • the first, second and third regions of the backlight are respectively illuminated, and the position where the backlight partition is lit is marked with a diagonal grid, and the positions where the interference signals appear are different and the number is different. , that is, the degree of crosstalk caused is different, which will cause crosstalk asymmetry.
  • the number of partitions is even, the position where the backlight partition is lit is marked with a diagonal grid, and when the backlight is lit, the second region of the liquid crystal panel signal is selected to be minimized to minimize the center crosstalk.
  • Interference signals appear in different locations and in different numbers, which can cause crosstalk asymmetry.
  • the invention determines the degree of crosstalk, and adjusts the duty ratio of the backlight partition of the relative signal, that is, the backlight partition with a small degree of crosstalk during lighting relatively increases the driving duty ratio. Conversely, it is lowered to improve image quality.
  • the driving duty ratio is the third backlight partition, and the driving duty ratio is the second largest.
  • the third largest driving duty cycle is the first and fifth backlight partitions.
  • the side-input non-uniform duty cycle backlight driving method of the present invention utilizes the liquid crystal panel signal and the backlight scanning timing to determine the influence of each backlight partition on the crosstalk, change the backlight partition driving duty ratio, and improve the crosstalk display quality. .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Description

侧入式非均匀占空比背光驱动方法 技术领域
本发明涉及液晶显示技术， 尤其涉及一种侧入式非均匀占空比背光驱 动方法。 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 imgf000004_0001
由于背光分区的设计， 液晶面板信号、 眼镜信号、 背光扫描三者的时 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， 并且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。 发明内容 因此， 本发明的目的在于利用液晶面板信号与背光分区扫描时序， 判 断各个背光分区对串扰的影响， 通过改变背光分区驱动占空比不同， 改善 串扰显示品质。
为实现上述目的， 本发明提供一种侧入式非均匀占空比背光驱动方 法， 包括：
步骤 1、 在进行实际背光驱动之前， 根据预定的液晶面板信号与背光 扫描时序， 按照均匀占空比方式模拟驱动侧入式背光模组的过程；
步骤 2、 分析模拟驱动侧入式背光模组过程中各背光分区点亮时出现 的干扰信号区域数目及干扰信号距离， 按照各背光分区点亮时干扰信号造 成串扰的程度对各背光分区进行排序， 具有较小串扰程度的背光分区排序 在前；
步骤 3、 实际驱动侧入式背光模组时， 根据预定的液晶面板信号与背 光扫描时序驱动， 排序在前的背光分区点亮时分配较高的背光驱动占空 比。
其中， 当所述侧入式背光模组的背光分区数为奇数时， 背光点亮时维 持在液晶面板信号中间， 以使串扰最小。
其中， 当所述侧入式背光模组的背光分区数为五时， 实际驱动侧入式 背光模组时， 驱动占空比最大的为第三背光分区， 驱动占空比第二大的为 第二和第四背光分区， 驱动占空比第三大的为第一和第五背光分区。
其中， 当所述侧入式背光模组的背光分区数为偶数时， 背光点亮时维 持在液晶面板信号第二区， 以使中心串扰最小。
其中， 当所述侧入式背光模组的背光分区数为四时， 实际驱动侧入式 背光模组时， 驱动占空比最大的为第二背光分区， 驱动占空比第二大的为 第一背光分区， 驱动占空比第三大的为第三背光分区， 驱动占空比第四大 的为第四背光分区。
其中， 所述液晶面板信号为左眼液晶面板信号或右眼液晶面板信号。 其中， 所述侧入式背光模组为单短边入光。
其中， 所述侧入式背光模组为双短边入光。
本发明还提供一种侧入式非均匀占空比背光驱动方法， 包括： 步骤 1、 在进行实际背光驱动之前， 根据预定的液晶面板信号与背光 扫描时序， 按照均匀占空比方式模拟驱动侧入式背光模组的过程；
步骤 2、 分析模拟驱动侧入式背光模组过程中各背光分区点亮时出现 的干扰信号区域数目及干扰信号距离， 按照各背光分区点亮时干扰信号造 成串扰的程度对各背光分区进行排序， 具有较小串扰程度的背光分区排序 在前；
步骤 3、 实际驱动侧入式背光模组时， 根据预定的液晶面板信号与背 光扫描时序驱动， 排序在前的背光分区点亮时分配较高的背光驱动占空 比；
其中， 当所述侧入式背光模组的背光分区数为奇数时， 背光点亮时维 持在液晶面板信号中间， 以使串扰最小；
其中， 当所述侧入式背光模组的背光分区数为五时， 实际驱动侧入式 背光模组时， 驱动占空比最大的为第三背光分区， 驱动占空比第二大的为 第二和第四背光分区， 驱动占空比第三大的为第一和第五背光分区；
其中， 所述液晶面板信号为左眼液晶面板信号；
其中， 所述侧入式背光模组为单短边入光。
本发明的侧入式非均匀占空比背光驱动方法在具有扫描功能的背光模 组中， 利用不均匀占空比的背光驱动方式， 来改善串扰， 增加显示品质。 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为本发明一较佳实施例中液晶面板信号与背光扫描时序 图， 图 5A中背光分区数为奇数， 图 5B中背光分区数为偶数；
图 6为本发明一较佳实施例中均匀占空比与修改后相对占空比大小的 示意图， 图 6中上方为奇数 5背光分区， 下方为偶数 4背光分区；
图 Ί为本发明侧入式非均匀占空比背光驱动方法的流程图。 具体实施方式
参见图 7, 其为本发明侧入式非均匀占空比背光驱动方法， 包括： 步骤 1、 在进行实际背光驱动之前， 根据预定的液晶面板信号与背光 扫描时序， 按照均匀占空比方式模拟驱动侧入式背光模组的过程； 步骤 2、 分析模拟驱动侧入式背光模组过程中各背光分区点亮时出现 的干扰信号区域数目及干扰信号距离， 按照各背光分区点亮时干扰信号造 成串扰的程度对各背光分区进行排序， 具有较小串扰程度的背光分区排序 在前；
步骤 3、 实际驱动侧入式背光模组时， 根据预定的液晶面板信号与背 光扫描时序驱动， 排序在前的背光分区点亮时分配较高的背光驱动占空 比。
其中， 该侧入式背光模组可以为单短边入光， 也可以为双短边入光。 现有液晶显示的 LED背光驱动一般釆用 PWM (脉宽调制 ) 的方式， 通过调节驱动占空比， 可以调节背光亮度等参数。 本发明在具有扫描功能 的背光模组中， 利用不均匀占空比的背光驱动方式， 来改善串扰， 增加显 示品质。
下面结合图 5A、 图 5B及图 6来具体说明本发明的侧入式非均匀占空 比背光驱动方法。 图 5A及图 5B为本发明一较佳实施例中液晶面板信号与 背光扫描时序图， 图 5A 中背光分区数为奇数， 图 5B 中背光分区数为偶 数； 图 6为本发明一较佳实施例中均匀占空比与修改后相对占空比大小的 示意图， 图 6中上方为奇数 5背光分区， 下方为偶数 4背光分区。
如图 5A 所示， 分区数为奇数， 左、 右眼液晶面板信号依序排列， 左 右眼信号的范围由括号标出， 背光点亮时， 选择维持在液晶面板信号中 间， 以使串扰最小。 在液晶面板信号循环的过程中， 分别为背光第一、 第 二、 第三区点亮情况， 背光分区点亮的位置以斜线格标出， 图中可见干扰 信号出现的位置不同、 数目不同， 也就是造成的串扰程度不同， 会造成串 扰不对称。 图 5B中 分区数为偶数， 背光分区点亮的位置以斜线格标出， 背光点亮时， 选择维持在液晶面板信号第二区， 以使中心串扰最小。 干扰 信号出现的位置不同、 数目不同， 会造成串扰不对称。
本发明通过分析干扰信号区域数目多少、 干扰信号距离远近， 判断串 扰程度， 调整相对信号的背光分区的占空比， 也就是对于点亮时串扰程度 小的背光分区相对提高其驱动占空比， 反之则降低， 从而提升图像质量。 如图 6所示， 当侧入式背光模组的背光分区数为五时， 实际驱动侧入式背 光模组时， 驱动占空比最大的为第三背光分区， 驱动占空比第二大的为第 二和第四背光分区， 驱动占空比第三大的为第一和第五背光分区。 当侧入 式背光模组的背光分区数为四时， 实际驱动侧入式背光模组时， 驱动占空 比最大的为第二背光分区， 驱动占空比第二大的为第一背光分区， 驱动占 空比第三大的为第三背光分区， 驱动占空比第四大的为第四背光分区。 综上所述， 本发明的侧入式非均匀占空比背光驱动方法利用液晶面板 信号与背光扫描时序， 判断各个背光分区对串扰的影响， 改变背光分区驱 动占空比不同， 改善串扰显示品质。
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、 一种侧入式非均匀占空比背光驱动方法， 包括：
步骤 1、 在进行实际背光驱动之前， 根据预定的液晶面板信号与背光 扫描时序， 按照均匀占空比方式模拟驱动侧入式背光模组的过程；
步骤 2、 分析模拟驱动侧入式背光模组过程中各背光分区点亮时出现 的干扰信号区域数目及干扰信号距离， 按照各背光分区点亮时干扰信号造 成串扰的程度对各背光分区进行排序， 具有较小串扰程度的背光分区排序 在前；
步骤 3、 实际驱动侧入式背光模组时， 根据预定的液晶面板信号与背 光扫描时序驱动， 排序在前的背光分区点亮时分配较高的背光驱动占空 比。
2、 如权利要求 1 所述的侧入式非均匀占空比背光驱动方法， 其中， 当所述侧入式背光模组的背光分区数为奇数时， 背光点亮时维持在液晶面 板信号中间， 以使串扰最小。
3、 如权利要求 1 所述的侧入式非均匀占空比背光驱动方法， 其中， 当所述侧入式背光模组的背光分区数为五时， 实际驱动侧入式背光模组 时， 驱动占空比最大的为第三背光分区， 驱动占空比第二大的为第二和第 四背光分区， 驱动占空比第三大的为第一和第五背光分区。
4、 如权利要求 1 所述的侧入式非均匀占空比背光驱动方法， 其中， 当所述侧入式背光模组的背光分区数为偶数时， 背光点亮时维持在液晶面 板信号第二区， 以使中心串扰最小。
5、 如权利要求 4 所述的侧入式非均匀占空比背光驱动方法， 其中， 当所述侧入式背光模组的背光分区数为四时， 实际驱动侧入式背光模组 时， 驱动占空比最大的为第二背光分区， 驱动占空比第二大的为第一背光 分区， 驱动占空比第三大的为第三背光分区， 驱动占空比第四大的为第四 背光分区。
6、 如权利要求 1 所述的侧入式非均匀占空比背光驱动方法， 其中， 所述液晶面板信号为左眼液晶面板信号或右眼液晶面板信号。
7、 如权利要求 1 所述的侧入式非均匀占空比背光驱动方法， 其中， 所述侧入式背光模组为单短边入光。
8、 如权利要求 1 所述的侧入式非均匀占空比背光驱动方法， 其中， 所述侧入式背光模组为双短边入光。
9、 一种侧入式非均匀占空比背光驱动方法， 包括：
步骤 1、 在进行实际背光驱动之前， 根据预定的液晶面板信号与背光 扫描时序， 按照均匀占空比方式模拟驱动侧入式背光模组的过程；
步骤 2、 分析模拟驱动侧入式背光模组过程中各背光分区点亮时出现 的干扰信号区域数目及干扰信号距离， 按照各背光分区点亮时干扰信号造 成串扰的程度对各背光分区进行排序， 具有较小串扰程度的背光分区排序 在前；
步骤 3、 实际驱动侧入式背光模组时， 根据预定的液晶面板信号与背 光扫描时序驱动， 排序在前的背光分区点亮时分配较高的背光驱动占空 比；
其中， 当所述侧入式背光模组的背光分区数为奇数时， 背光点亮时维 持在液晶面板信号中间， 以使串扰最小；
其中， 当所述侧入式背光模组的背光分区数为五时， 实际驱动侧入式 背光模组时， 驱动占空比最大的为第三背光分区， 驱动占空比第二大的为 第二和第四背光分区， 驱动占空比第三大的为第一和第五背光分区；
其中， 所述液晶面板信号为左眼液晶面板信号；
其中， 所述侧入式背光模组为单短边入光。
PCT/CN2012/078532 2012-06-28 2012-07-12 侧入式非均匀占空比背光驱动方法 Ceased WO2014000325A1 (zh)

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