WO2019210641A1 - 消除背光Mura的方法 - Google Patents

消除背光Mura的方法 Download PDF

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Publication number
WO2019210641A1
WO2019210641A1 PCT/CN2018/107818 CN2018107818W WO2019210641A1 WO 2019210641 A1 WO2019210641 A1 WO 2019210641A1 CN 2018107818 W CN2018107818 W CN 2018107818W WO 2019210641 A1 WO2019210641 A1 WO 2019210641A1
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Prior art keywords
backlight
partition
standard
partitions
brightness
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Ceased
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PCT/CN2018/107818
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English (en)
French (fr)
Inventor
肖光星
付玉红
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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 US16/097,281 priority Critical patent/US11049462B2/en
Publication of WO2019210641A1 publication Critical patent/WO2019210641A1/zh
Anticipated expiration legal-status Critical
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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
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a method for eliminating a backlight Mura.
  • LCD Liquid Crystal Display
  • PDA personal digital assistant
  • digital camera computer screen or Laptop screens, etc.
  • liquid crystal display devices which include a casing, a liquid crystal panel disposed in the casing, and a backlight module disposed in the casing.
  • the structure of the liquid crystal panel is composed of a color filter substrate (CF), a thin film transistor array substrate (TFT Array Substrate), and a liquid crystal layer (Liquid Crystal Layer) disposed between the two substrates. Composition.
  • the liquid crystal panel itself does not emit light, and its working principle is to control the rotation of the liquid crystal molecules of the liquid crystal layer by applying a driving voltage on the two glass substrates, and refract the light of the backlight module to generate a picture.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different incident positions of the backlight.
  • the direct-lit backlight module is configured such that a backlight light source such as a cathode fluorescent lamp (CCFL) or a light emitting diode (LED) light bar is disposed behind the liquid crystal panel to directly form a surface.
  • the light source is supplied to the liquid crystal panel.
  • the conventional direct type backlight module includes a back sheet 100 , a reflective sheet 200 disposed in the back sheet 100 , and a plurality of LED strips 201 disposed on the reflective sheet 200 and fixed to A diffusion sheet 300 disposed above the plurality of LED strips 201 and an optical film group 400 covering the diffusion sheet 300 are disposed in the back panel 100, and a plurality of LED lamps are disposed on each of the LED strips 201.
  • the direct-lit backlight modules should be made thinner or thinner to spread in order to save costs.
  • the film will have a backlight Mura (uneven brightness) defect.
  • each backlight partition includes 6 ⁇ 6 pixels
  • Luminance compensation assuming that the luminance compensation data of each backlight partition is calculated, four gray scales (such as 12, 60, 120, 192) are selected from 0 to 255 gray scales, and other gray scales are linearized by the selected four gray scales. Interpolation, then the high definition (HD) type liquid crystal display and the ultra high definition (UD) type liquid crystal display need to occupy the data storage amount when the backlight Mura is used for brightness compensation:
  • the object of the present invention is to provide a method for eliminating the backlight Mura, which not only can effectively eliminate the backlight Mura defect, but also allows the direct-lit backlight module to be made thinner or lower in cost, and can greatly reduce the amount of data storage and save logic resources.
  • the present invention provides a method of eliminating a backlight Mura, comprising the steps of:
  • Step S1 providing a liquid crystal display, the liquid crystal display comprising a backlight module;
  • Step S2 first dividing the backlight emitted by the backlight module into a plurality of backlight partitions, and one backlight partition corresponding to multiple pixels; and then dividing each backlight partition into a plurality of unit blocks, and one unit block corresponds to a plurality of pixels. ;
  • Step S3 capturing a screen of the liquid crystal display to obtain brightness corresponding to all backlight partitions
  • Step S4 Acquire brightness compensation data of all backlight partitions according to brightness conditions corresponding to all backlight partitions
  • Step S5 selecting one of the backlight partitions as a standard backlight partition, selecting brightness compensation data corresponding to the standard backlight partition from the brightness compensation data of all the backlight partitions, and calculating other backlights. a difference in brightness between the partition and the standard backlight partition;
  • Step S6 Perform brightness compensation on the corresponding backlight partition according to the brightness compensation data corresponding to the standard backlight partition and the calculated brightness difference between the other backlight partitions and the standard backlight partition.
  • the data storage amount occupied by the step S5 is:
  • N represents the number of all backlight partitions, and N is a positive integer greater than one;
  • a ⁇ B represents the number of unit blocks into which the standard backlight partition is divided, A is a positive integer greater than 1, and B is a positive integer greater than one;
  • i represents the number of gray levels selected when calculating the brightness compensation data, and i is a positive integer greater than 1 and less than 256;
  • ⁇ b represents the number of bits corresponding to the luminance difference ⁇ of the other backlight partitions of the standard backlight partition and the standard backlight partition;
  • the backlight module is a direct type backlight module, and includes a back plate, a reflection sheet disposed in the back plate, a plurality of LED light bars disposed on the reflection sheet, and being fixed in the back plate and located at the back plate
  • the diffusion sheet above the LED strips and the optical film set covering the diffusion sheet are arranged with a plurality of LED lamps on each LED strip.
  • each of the backlight partitions has the same number of pixels.
  • a part of the backlight partition corresponds to a number of pixels corresponding to another part of the backlight partition.
  • each of the unit blocks has the same number of pixels.
  • a part of the unit block corresponds to a number of pixels corresponding to another part of the unit block.
  • the brightness difference ⁇ of the other backlight partitions and the standard backlight partitions of the standard backlight partition is in a range of 0 ⁇ 15, and the other backlight partitions correspond to the luminance difference ⁇ of the standard backlight partitions.
  • the number of bits is 4 bits.
  • the step S6 performs brightness compensation by linear interpolation.
  • the invention provides a method for eliminating the backlight Mura, dividing the backlight emitted by the backlight module into a plurality of backlight partitions, further dividing each backlight partition into a plurality of unit blocks, and then selecting Determining a certain backlight partition among all the backlight partitions as a standard backlight partition, selecting brightness compensation data corresponding to the standard backlight partition from brightness compensation data of all backlight partitions, and calculating the removal of the standard backlight partition a brightness difference between the other respective backlight partitions and the standard backlight partition, and then according to the brightness compensation data corresponding to the standard backlight partition and the calculated brightness difference between the other respective backlight partitions and the standard backlight partition.
  • the implementation of brightness compensation in the partition can not only effectively eliminate the backlight Mura defect, but also allow the direct-lit backlight module to be made thinner or lower in cost, and can greatly reduce the amount of data storage and save logic resources.
  • FIG. 1 is a schematic structural view of a conventional direct type backlight module
  • FIG. 2 is a flow chart of a method for eliminating a backlight Mura of the present invention
  • FIG. 3 is a schematic structural view of a direct type backlight module in a liquid crystal display provided by step S1 of the method for eliminating a backlight Mura of the present invention
  • step S2 is a schematic diagram of dividing a backlight partition in step S2 of the method for eliminating a backlight Mura according to the present invention
  • FIG. 5 is a schematic diagram of dividing a unit block of a backlight partition in step S2 of the method for eliminating a backlight Mura according to the present invention
  • Figure 6 is a schematic diagram of linear interpolation.
  • the present invention provides a method for eliminating a backlight Mura, including the following steps:
  • Step S1 provides a liquid crystal display, and the liquid crystal display includes a backlight module BLM.
  • the backlight module BLM is not limited to a direct type backlight module, and includes a back plate 10 , a reflective sheet 20 disposed in the back plate 10 , and the reflective sheet 20 . a plurality of LED strips 21, a diffusion sheet 30 fixed in the back sheet 10 and located above the plurality of LED strips 21, and an optical film set 40 covering the diffusion sheet 30, each LED strip There are a plurality of LED lights distributed on the 21st.
  • Step S2 referring to FIG. 4 and FIG. 5, the backlight emitted by the backlight module BLM is first divided into a plurality of backlight partitions R, and one backlight partition R corresponds to a plurality of pixels; and each backlight partition R is divided into several The unit block U, one unit block U corresponds to a plurality of pixels.
  • the number of pixels corresponding to each of the backlight partitions R may be the same.
  • the step S2 divides the backlight emitted by the direct type backlight module BLM into 24 backlight partitions R, each of which is divided into 24 backlight partitions R.
  • a backlight partition R corresponds to 219 x 164 pixels.
  • the number of pixels corresponding to each of the unit blocks U may be the same, and the number of pixels corresponding to the unit block U may be more than the other unit.
  • the number of pixels corresponding to block U For example, as shown in FIG. 5, the backlight partition R corresponds to 219 ⁇ 164 pixels, and the step S2 basically divides the unit block U into the backlight partition R by 6 ⁇ 6 pixels, and encounters less than 6 ⁇ 6. The positions of the pixels divide 6 ⁇ 2 pixels, 3 ⁇ 6 pixels and 3 ⁇ 2 pixels into one unit block U, and finally divide the backlight partition R into 37 ⁇ 28 unit blocks U.
  • step S3 the screen of the liquid crystal display is photographed, and the brightness corresponding to all the backlight partitions R is obtained.
  • Step S4 Acquire brightness compensation data of all backlight partitions R according to brightness conditions corresponding to all backlight partitions R.
  • Step S5 selecting one of the backlight partitions R as a standard backlight partition, selecting brightness compensation data corresponding to the standard backlight partition from the brightness compensation data of all the backlight partitions R, and calculating The difference in brightness between the other respective backlight partitions R and the standard backlight partition.
  • the amount of data storage occupied by the step S5 is:
  • 7bit represents the number of bits of luminance compensation data corresponding to the standard backlight partition (where 1 bit represents a sign, and the remaining 6 bits represent a data size);
  • N represents the number of all backlight partitions R, and N is a positive integer greater than one;
  • a ⁇ B represents the number of unit blocks U into which the standard backlight partition is divided, A is a positive integer greater than 1, and B is a positive integer greater than one;
  • i represents the number of gray levels selected when calculating the brightness compensation data, i is a positive integer greater than 1 and less than 256, for example, 4 gray levels of 12, 60, 120, 192 are selected (the other gray levels are selected by the other gray levels) The order is linear interpolation), then the value of i is 4;
  • ⁇ b represents the number of bits corresponding to the luminance difference ⁇ of the other backlight partitions R of the standard backlight partition and the standard backlight partition; in order to implement effective luminance compensation, the other backlight partitions of the standard backlight partition are removed.
  • the luminance difference ⁇ from the standard backlight partition ranges from 0 ⁇ ⁇ ⁇ 15, then the number of bits corresponding to the luminance difference ⁇ of the other backlight partitions R and the standard backlight partitions of the standard backlight partition is removed. It is 4bit.
  • the data storage amount occupied by the step S5 is:
  • the backlight is partitioned by a unit area of 6 ⁇ 6 pixels, and then each backlight partition is separately subjected to luminance compensation, and the required data storage amount is:
  • Step S6 performing brightness compensation on the corresponding backlight partition R according to the brightness compensation data corresponding to the standard backlight partition and the calculated brightness difference between the other backlight partitions R and the standard backlight partition, thereby effectively eliminating the direct backlight Mura defect.
  • the brightness compensation data of some other backlight partition R the brightness compensation data of the standard backlight partition + the corresponding brightness difference value.
  • the brightness compensation data of the standard backlight partition selects four gray levels of 12, 60, 120, and 192, and the brightness compensation data of some other backlight partition R calculated by the above formula also includes
  • linear interpolation is used to compensate for other gray levels.
  • the brightness compensation value of the known gray level x1 is y1
  • the brightness compensation value of the known gray level x2 is y2, which is required for any gray level between the gray level x1 and the gray level x2.
  • the two points (x1, y1) and (x2, y2) are connected, and the following linear interpolation formula is used for calculation:
  • the brightness compensation can be performed on the gray scale x. Further, the above steps S2, S4, S5, and S6 are performed by a timing control (TCON) module of the liquid crystal display.
  • TCON timing control
  • the method for eliminating the backlight Mura of the present invention can effectively eliminate the direct-type backlight Mura defect, so the technician can make the direct-type backlight module thinner or use a thinner diffusion sheet with lower cost without generating the backlight Mura defect. .
  • the method for eliminating the backlight Mura of the present invention divides the backlight emitted by the backlight module into a plurality of backlight partitions, further divides each backlight partition into a plurality of unit blocks, and selects all backlight partitions.
  • One of the backlight partitions is used as a standard backlight partition, and brightness compensation data corresponding to the standard backlight partition is selected from brightness compensation data of all backlight partitions, and other backlight partitions including the standard backlight partition are calculated.

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  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
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  • Liquid Crystal Display Device Control (AREA)

Abstract

一种消除背光Mura的方法，将背光模组发出的背光划分为数个背光分区（R），进一步将每个背光分区（R）分别划分成数个单元区块（U），再选定全部背光分区（R）之中的某一背光分区（R）作为标准背光分区，从全部背光分区（R）的亮度补偿数据中择选出对应于标准背光分区的亮度补偿数据，并计算出除去标准背光分区的其它各个背光分区（R）与标准背光分区的亮度差值，之后根据对应于标准背光分区的亮度补偿数据及计算出的其它各个背光分区（R）与标准背光分区的亮度差值对相应的背光分区（R）实施亮度补偿，不仅能够有效消除背光Mura缺陷，允许直下式背光模组做得更薄或成本更低，而且能够大幅减少数据存储量，节省逻辑资源。

Description

消除背光Mura的方法 技术领域
本发明涉及液晶显示技术领域，尤其涉及一种消除背光Mura的方法。
背景技术
液晶显示器(Liquid Crystal Display，LCD)具有机身薄、省电、无辐射等众多优点，得到了广泛地应用，如：液晶电视、移动电话、个人数字助理(PDA)、数字相机、计算机屏幕或笔记本电脑屏幕等。
现有市场上的液晶显示器大部分为背光型液晶显示装置，其包括壳体、设于壳体内的液晶面板及设于壳体内的背光模组(Backlight module)。
液晶面板的结构是由一彩色滤光片基板(Color Filter，CF)、一薄膜晶体管阵列基板(Thin Film Transistor Array Substrate，TFT Array Substrate)以及一配置于两基板间的液晶层(Liquid Crystal Layer)所构成。液晶面板本身并不发光，其工作原理是通过在两片玻璃基板上施加驱动电压来控制液晶层的液晶分子的旋转，将背光模组的光线折射出来产生画面。
背光模组依照背光源入射位置的不同分成侧入式背光模组与直下式背光模组两种。其中，直下式背光模组是将背光发光光源例如阴极荧光灯管(Cold Cathode Fluorescent Lamp，CCFL)或发光二极管(Light Emitting Diode，LED)灯条(Light Bar)等设置在液晶面板后方，直接形成面光源提供给液晶面板。由于现在的直下式背光模组正变得越来越薄，再加上它较低的价格和更好的光学均匀性，采用直下式背光模组的液晶显示器在市场上的占有率越来越高。
如图1所示，现有的直下式背光模组包括背板100、设于所述背板100内的反射片200、设于所述反射片200上的数个LED灯条201、固定于所述背板100内并位于所述数个LED灯条201上方的扩散片300及覆盖所述扩散片300的光学膜片组400，每一LED灯条201上分布有多个LED灯。随着大尺寸LCD电视的普及，用户对背光模组轻薄的需求越来越高，但是在现有技术条件下要将直下式背光模组做得更薄或者为了节省成本而采用较薄的扩散片，会出现背光Mura(亮度不均匀)缺陷。现有的消除直下式背光Mura的方法通常是以6×6个像素(Pixel)为单位区域去对背光进行分区(即每个背光分区包括6×6个像素)，再对各个背光分区分别进行亮度补偿，假设计算每个背光分区的亮度补偿数据时从0～255灰阶中选取4个灰 阶(如12、60、120、192)，其它灰阶用选取的这4个灰阶做线性插值，那么高清(High Definition，HD)型液晶显示器与超高清(Ultra High Definition，UD)型液晶显示器在对背光Mura进行亮度补偿时分别需要占用的数据存储量为：
HD型：7bit×1366×768×4/(6×6)＝816Kbit
UD型：7bit×3840×2160×4/(6×6)＝6451Kbit
可见，现有的消除直下式背光Mura的方法所需的存储太大，占用的逻辑资源过多。
发明内容
本发明的目的在于提供一种消除背光Mura的方法，不仅能够有效消除背光Mura缺陷，允许直下式背光模组做得更薄或成本更低，而且能够大幅减少数据存储量，节省逻辑资源。
为实现上述目的，本发明提供一种消除背光Mura的方法，包括以下步骤：
步骤S1、提供液晶显示器，所述液晶显示器包括背光模组；
步骤S2、先将所述背光模组发出的背光划分为数个背光分区，一个背光分区对应多个像素；再将每个背光分区分别划分成数个单元区块，一个单元区块对应数个像素；
步骤S3、对所述液晶显示器的屏幕进行拍摄，获得全部背光分区对应的亮度情况；
步骤S4、根据全部背光分区对应的亮度情况获取全部背光分区的亮度补偿数据；
步骤S5、选定全部背光分区之中的某一背光分区作为标准背光分区，从全部背光分区的亮度补偿数据中择选出对应于所述标准背光分区的亮度补偿数据，并计算出其它各个背光分区与所述标准背光分区的亮度差值；
步骤S6、根据对应于所述标准背光分区的亮度补偿数据及计算出的其它各个背光分区与所述标准背光分区的亮度差值对相应的背光分区实施亮度补偿。
所述步骤S5所占用的数据存储量为：
A×B×i×7bit+(N-1)×Δb
其中：
N表示全部背光分区的数量，N为大于1的正整数；
A×B表示所述标准背光分区被划分成的单元区块的数量，A为大于1 的正整数，B为大于1的正整数；
i表示计算亮度补偿数据时选取的灰阶个数，i为大于1且小于256的正整数；
Δb表示除去所述标准背光分区的其它背光分区与所述标准背光分区的亮度差值Δ所对应的比特数；
所述背光模组为直下式背光模组，包括背板、设于所述背板内的反射片、设于所述反射片上的数个LED灯条、固定于所述背板内并位于所述数个LED灯条上方的扩散片及覆盖所述扩散片的光学膜片组，每一LED灯条上分布有多个LED灯。
可选的，每个所述背光分区所对应的像素数目相同。
可选的，部分所述背光分区所对应的像素数目多于另一部分所述背光分区所对应的像素数目。
可选的，在一个所述背光分区内，每个所述单元区块所对应的像素数目相同。
可选的，在一个所述背光分区内，部分所述单元区块所对应的像素数目多于另一部分所述单元区块所对应的像素数目。
所述除去所述标准背光分区的其它背光分区与标准背光分区的亮度差值Δ的取值范围为：0≤Δ≤15，所述其它背光分区与标准背光分区的亮度差值Δ所对应的比特数为4bit。
所述步骤S6采用线性插值方式实施亮度补偿。
本发明的有益效果：本发明提供的一种消除背光Mura的方法，将所述背光模组发出的背光划分为数个背光分区，进一步将每个背光分区分别划分成数个单元区块，再选定全部背光分区之中的某一背光分区作为标准背光分区，从全部背光分区的亮度补偿数据中择选出对应于所述标准背光分区的亮度补偿数据，并计算出除去所述标准背光分区的其它各个背光分区与所述标准背光分区的亮度差值，之后根据对应于所述标准背光分区的亮度补偿数据及计算出的其它各个背光分区与所述标准背光分区的亮度差值对相应的背光分区实施亮度补偿，不仅能够有效消除背光Mura缺陷，允许直下式背光模组做得更薄或成本更低，而且能够大幅减少数据存储量，节省逻辑资源。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发 明加以限制。
附图中，
图1为现有的直下式背光模组的结构简图；
图2为本发明的消除背光Mura的方法的流程图；
图3为本发明的消除背光Mura的方法的步骤S1所提供的液晶显示器中直下式背光模组的结构简图；
图4为本发明的消除背光Mura的方法的步骤S2中划分背光分区的示意图；
图5为本发明的消除背光Mura的方法的步骤S2中对背光分区划分单元区块的示意图；
图6为线性插值的示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请同时参阅图2至图5，本发明提供一种消除背光Mura的方法，包括以下步骤：
步骤S1、提供液晶显示器，所述液晶显示器包括背光模组BLM。
具体地，如图3所示，所述背光模组BLM不限于为直下式背光模组，包括背板10、设于所述背板10内的反射片20、设于所述反射片20上的数个LED灯条21、固定于所述背板10内并位于所述数个LED灯条21上方的扩散片30及覆盖所述扩散片30的光学膜片组40，每一LED灯条21上分布有多个LED灯。
在现有技术条件下要将直下式背光模组做得很薄或者为了节省成本而采用较薄的扩散片30，比较容易出现背光Mura缺陷。步骤S2、请参阅图4与图5，先将所述背光模组BLM发出的背光划分为数个背光分区R，一个背光分区R对应多个像素；再将每个背光分区R分别划分成数个单元区块U，一个单元区块U对应数个像素。
具体地：每个所述背光分区R所对应的像素数目可以相同，以图4所示为例，该步骤S2将所述直下式背光模组BLM发出的背光划分为24个背光分区R，每一背光分区R对应219×164个像素。当然，在液晶显示器的屏幕所包括的像素个数不足以被一特定像素数目整除的情况下，也可以设置部分所述背光分区R所对应的像素数目多于另一部分所述背光分区R(通常位于液晶显示器屏幕的边缘)所对应的像素数目。
同样地，在一个所述背光分区R内，每个所述单元区块U所对应的像素数目可以相同，也可以设置部分所述单元区块U所对应的像素数目多于另一部分所述单元区块U所对应的像素数目。以图5所示为例，所述背光分区R对应219×164个像素，该步骤S2基本是以6×6个像素去对所述背光分区R划分单元区块U，碰到不足6×6个像素的位置便将6×2个像素、3×6个像素及3×2个像素划分为一个单元区块U，最终将所述背光分区R划分为37×28个单元区块U。
步骤S3、对所述液晶显示器的屏幕进行拍摄，获得全部背光分区R对应的亮度情况。
步骤S4、根据全部背光分区R对应的亮度情况获取全部背光分区R的亮度补偿数据。
步骤S5、选定全部背光分区R之中的某一背光分区R作为标准背光分区，从全部背光分区R的亮度补偿数据中择选出对应于所述标准背光分区的亮度补偿数据，并计算出其它各个背光分区R与所述标准背光分区的亮度差值。
具体地，该步骤S5所占用的数据存储量为：
A×B×i×7bit+(N-1)×Δb
其中：
7bit表示对应于所述标准背光分区的亮度补偿数据的比特数(其中1bit表示正负号，剩余的6bit表示数据大小)；
N表示全部背光分区R的数量，N为大于1的正整数；
A×B表示所述标准背光分区被划分成的单元区块U的数量，A为大于1的正整数，B为大于1的正整数；
i表示计算亮度补偿数据时选取的灰阶个数，i为大于1且小于256的正整数，例如选取12、60、120、192这4个灰阶(其它灰阶用选取的这4个灰阶做线性插值)，那么i的取值便为4；
Δb表示除去所述标准背光分区的其它背光分区R与所述标准背光分区的亮度差值Δ所对应的比特数；为了实施有效的亮度补偿，所述除去所述标准背光分区的其它背光分区R与标准背光分区的亮度差值Δ的取值范围为：0≤Δ≤15，那么所述除去所述标准背光分区的其它背光分区R与标准背光分区的亮度差值Δ所对应的比特数便为4bit。
承接图4与图5的具体示例，该步骤S5所占用的数据存储量为：
37×28×4×7bit+(24-1)×4bit≈29Kbit
而若采用现有的消除直下式背光Mura的方法，以6×6个像素为单位区 域去对背光进行分区，再对各个背光分区分别进行亮度补偿，所需的数据存储量为：
7bit×219×164×4×24/(6×6)≈670Kbit
可见，本发明中的数据存储量大幅减少了，相应对逻辑资源的占用量大幅降低。
步骤S6、根据对应于所述标准背光分区的亮度补偿数据及计算出的其它各个背光分区R与所述标准背光分区的亮度差值对相应的背光分区R实施亮度补偿，从而有效消除直下式背光Mura缺陷。
具体地：
某一其它背光分区R的亮度补偿数据＝所述标准背光分区的亮度补偿数据+对应的亮度差值。
然后采用线性插值方式实施亮度补偿。承接前述步骤S5的举例，所述标准背光分区的亮度补偿数据选取了12、60、120、192这4个灰阶，那么经上式计算出的某一其它背光分区R的亮度补偿数据同样包括了12、60、120、192这4个灰阶，那么要对其它灰阶进行亮度补偿则采用线性插值的方式。请参阅图6，设已知灰阶x1的亮度补偿值为y1以及已知灰阶x2的亮度补偿值为y2，要求得位于灰阶x1与灰阶x2之间的任一灰阶所需要的亮度补偿值y，则将(x1，y1)与(x2，y2)这两点连线，采用以下线性插值公式来进行计算：
y＝(x2-x)×y1/(x2-x1)+(x-x1)×y2/(x2-x1)
即可对灰阶x实施亮度补偿。进一步地，上述步骤S2、S4、S5、S6通过液晶显示器的时序控制(TCON)模块来执行。
本发明的消除背光Mura的方法能够有效消除直下式背光Mura缺陷，所以技术人员可以将直下式背光模组做得更薄或采用成本更低的较薄的扩散片，而不会产生背光Mura缺陷。
综上所述，本发明的消除背光Mura的方法，将所述背光模组发出的背光划分为数个背光分区，进一步将每个背光分区分别划分成数个单元区块，再选定全部背光分区之中的某一背光分区作为标准背光分区，从全部背光分区的亮度补偿数据中择选出对应于所述标准背光分区的亮度补偿数据，并计算出除去所述标准背光分区的其它各个背光分区与所述标准背光分区的亮度差值，之后根据对应于所述标准背光分区的亮度补偿数据及计算出的其它各个背光分区与所述标准背光分区的亮度差值对相应的背光分区实施亮度补偿，不仅能够有效消除背光Mura缺陷，允许直下式背光模组做得更薄或成本更低，而且能够大幅减少数据存储量，节省逻辑资源。
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的权利要求的保护范围。

Claims (9)

  1. 一种消除背光Mura的方法，包括以下步骤：
    步骤S1、提供液晶显示器，所述液晶显示器包括背光模组；
    步骤S2、先将所述背光模组发出的背光划分为数个背光分区，一个背光分区对应多个像素；再将每个背光分区分别划分成数个单元区块，一个单元区块对应数个像素；
    步骤S3、对所述液晶显示器的屏幕进行拍摄，获得全部背光分区对应的亮度情况；
    步骤S4、根据全部背光分区对应的亮度情况获取全部背光分区的亮度补偿数据；
    步骤S5、选定全部背光分区之中的某一背光分区作为标准背光分区，从全部背光分区的亮度补偿数据中择选出对应于所述标准背光分区的亮度补偿数据，并计算出其它各个背光分区与所述标准背光分区的亮度差值；
    步骤S6、根据对应于所述标准背光分区的亮度补偿数据及计算出的其它各个背光分区与所述标准背光分区的亮度差值对相应的背光分区实施亮度补偿。
  2. 如权利要求1所述的消除背光Mura的方法，其中，所述步骤S5所占用的数据存储量为：
    A×B×i×7bit+(N-1)×Δb
    其中：
    N表示全部背光分区的数量，N为大于1的正整数；
    A×B表示所述标准背光分区被划分成的单元区块的数量，A为大于1的正整数，B为大于1的正整数；
    i表示计算亮度补偿数据时选取的灰阶个数，i为大于1且小于256的正整数；
    Δb表示除去所述标准背光分区的其它背光分区与所述标准背光分区的亮度差值Δ所对应的比特数。
  3. 如权利要求1所述的消除背光Mura的方法，其中，所述背光模组为直下式背光模组，包括背板、设于所述背板内的反射片、设于所述反射片上的数个LED灯条、固定于所述背板内并位于所述数个LED灯条上方的扩散片及覆盖所述扩散片的光学膜片组，每一LED灯条上分布有多个LED灯。
  4. 如权利要求1所述的消除背光Mura的方法，其中，每个所述背光分区所对应的像素数目相同。
  5. 如权利要求1所述的消除背光Mura的方法，其中，部分所述背光分区所对应的像素数目多于另一部分所述背光分区所对应的像素数目。
  6. 如权利要求1所述的消除背光Mura的方法，其中，在一个所述背光分区内，每个所述单元区块所对应的像素数目相同。
  7. 如权利要求1所述的消除背光Mura的方法，其中，在一个所述背光分区内，部分所述单元区块所对应的像素数目多于另一部分所述单元区块所对应的像素数目。
  8. 如权利要求2所述的消除背光Mura的方法，其中，所述除去所述标准背光分区的其它背光分区与标准背光分区的亮度差值Δ的取值范围为：0≤Δ≤15，所述其它背光分区与标准背光分区的亮度差值Δ所对应的比特数为4bit。
  9. 如权利要求1所述的消除背光Mura的方法，其中，所述步骤S6采用线性插值方式实施亮度补偿。
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