WO2015032104A1 - 一种液晶面板驱动方法、液晶显示装置和光斑补偿方法 - Google Patents

一种液晶面板驱动方法、液晶显示装置和光斑补偿方法 Download PDF

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Publication number
WO2015032104A1
WO2015032104A1 PCT/CN2013/083171 CN2013083171W WO2015032104A1 WO 2015032104 A1 WO2015032104 A1 WO 2015032104A1 CN 2013083171 W CN2013083171 W CN 2013083171W WO 2015032104 A1 WO2015032104 A1 WO 2015032104A1
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Prior art keywords
pixels
liquid crystal
pixel
crystal panel
compensation value
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PCT/CN2013/083171
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English (en)
French (fr)
Inventor
孙磊
陈宥烨
谭小平
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深圳市华星光电技术有限公司
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Priority to US14/112,035 priority Critical patent/US9202423B2/en
Publication of WO2015032104A1 publication Critical patent/WO2015032104A1/zh

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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
    • G09G3/36—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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data

Definitions

  • Liquid crystal panel driving method liquid crystal display device and spot compensation method
  • the present invention relates to the field of liquid crystal display, and more particularly to a liquid crystal panel driving method, a liquid crystal display device, and a spot compensation method.
  • Exposure is a very important process in the TFT manufacturing process.
  • the area will be exposed, and a strip-shaped, uneven spot will appear at the junction of the exposed areas (as shown in Figure 1).
  • the spot causes unevenness of the picture, which affects the display quality.
  • the technical problem to be solved by the present invention is to provide a liquid crystal panel driving method, a liquid crystal display device and a spot compensation method which can improve the spot effect of a liquid crystal panel.
  • a driving method of a liquid crystal panel comprising the steps of:
  • the compensation value corresponds to an offset value of the brightness at the spot of the liquid crystal panel before compensation with respect to the reference brightness.
  • the absolute value of the compensation value and the offset value are equal.
  • the absolute value of the compensation value and the offset value can completely correct the offset value and eliminate the spot.
  • the position and the compensation value of each pixel are stored in advance in the table unit, and when the liquid crystal panel is displayed, the compensation value is read from the table unit, and the compensation value is superimposed on the display data corresponding to the display area.
  • the position and compensation value of the pixel are stored in the table unit in advance, and the corresponding compensation value can be directly read from the table unit when the actual display is performed, and the complicated operation process is not required, which is advantageous for improving the response speed.
  • each of the pixels includes a plurality of sub-pixels, and one of the M sub-pixels is formed into a group Display area, each display area also has a jitter value, and display data of N sub-pixels in each display area is increased or decreased by a minimum gray scale unit after the compensation value is superimposed, where M and N are positive integers, and N ⁇ M, M is greater than or equal to four.
  • the liquid crystal panel adjusts the brightness value by gray scale.
  • the minimum adjustment unit of each sub-pixel is a gray scale. If a single sub-pixel is desired to achieve finer gray scale adjustment, the cost and technical difficulty will be doubled.
  • the technical solution adjusts a plurality of sub-pixels as one display area, and assumes that the brightness of the M sub-pixels are equal, wherein one sub-pixel is adjusted by a gray scale, and the gray scale of the entire display area is adjusted by 1/M gray scale. . Therefore, smoother and finer brightness adjustment can be achieved under the existing technical conditions without increasing the cost.
  • a transition interval is formed in units of adjacent M display regions, and the jitter values N of the M display regions in each transition interval are respectively equal to 0 ⁇ (M-1), and are sequentially incremented or decremented according to the physical positions thereof. . If the spot has two adjacent areas that need to compensate for very little brightness (such as a gray level), there is still a clear dividing line between the two areas, which affects the display quality. At this time, a plurality of transition intervals can be established between the two regions. Since the transition interval is composed of display regions, the display region can provide finer brightness adjustment, and the brightness of the display region of the transition interval is increased, which can result in A smooth brightness transition that dims the boundaries between the two areas to improve display quality.
  • a display area is formed by using M pixels as a group, and each display area further has a jitter value, and each display area has N pixels.
  • the display data is increased or decreased by a minimum gray scale unit after the compensation value is superimposed, where M and N are positive integers, and N ⁇ M.
  • a pixel is a basic imaging unit of a liquid crystal panel, so that a display area is formed in units of pixels, which is advantageous for ensuring image integrity.
  • a driving circuit for a liquid crystal panel comprising: a storage module storing a physical position of a pixel of the liquid crystal panel and a compensation value corresponding to the pixel; and an operation module for driving the panel according to a physical position of the pixel and a compensation value corresponding to the pixel; wherein The compensation value corresponds to the offset value of the brightness at the spot of the liquid crystal panel before compensation with respect to the reference brightness.
  • the storage unit includes a first storage unit that uses an EEPROM that stores each pixel physical address and its corresponding compensation value, and stores a second storage of the SRAM using each SRAM compensation value.
  • a storage unit an I 2 C interface unit for sequentially reading the storage unit data between the first storage unit and the operation module, decoding the storage unit data, and transmitting the position information of the pixel to the position decoding unit of the operation module;
  • the operation module is further coupled with a data stream receiving module, a second storage unit and an interpolation operation unit, and the interpolation operation unit is coupled with the video data stream sending module;
  • the first storage unit copies the compensation value of each pixel to the second storage unit
  • the operation module reads the display data of the data stream receiving module, and compares with the physical address of the pixel of the output of the position decoding unit, if the data is displayed.
  • the position belongs to the pixel position corresponding to the spot
  • the running module reads the compensation value of the corresponding pixel from the second storage unit, superimposes the compensation value on the display data, and sends it to the difference operation unit;
  • a display area is formed by using M sub-pixels as a group, and each display area further has a jitter value N, and each display area has N children.
  • the display data of the pixel is increased or decreased by a minimum gray scale unit after the compensation value is superimposed, wherein M and N are positive integers, and J-N ⁇ M, M is greater than or equal to four.
  • the liquid crystal panel adjusts the brightness value by gray scale.
  • the minimum adjustment unit of each sub-pixel is a gray scale. If a single sub-pixel is desired to achieve finer gray scale adjustment, the cost and technical difficulty will be doubled.
  • the technical solution adjusts a plurality of sub-pixels as one display area, and assumes that the brightness of the M sub-pixels are equal, wherein one sub-pixel is adjusted by a gray scale, and the gray scale of the entire display area is adjusted by 1/M gray scale. . Therefore, smoother and finer brightness adjustment can be achieved under the existing technical conditions without increasing the cost.
  • the SRAM data access speed is much larger than the EEPROM, so the compensation value can be copied to the SRAM after power-on.
  • the arithmetic module directly reads the compensation value from the SRAM for calculation, improves the operation efficiency, and can compensate the original video data in time to improve the response. speed.
  • a method for compensating a spot of a liquid crystal panel comprising the steps of:
  • the compensation value and the position of the corresponding pixel are stored in the liquid crystal panel for superimposing the corresponding compensation value when the display data of the pixel is outputted by the liquid crystal panel.
  • the jitter value is calculated:
  • the liquid crystal panel adjusts the brightness value by gray scale.
  • the minimum adjustment unit of each sub-pixel is a gray scale. Based on a single sub-pixel, it is necessary to achieve more refined gray-scale adjustment, and the cost and technical difficulty are doubled.
  • the technical solution adjusts a plurality of sub-pixels as one display area, and assumes that the brightness of the M sub-pixels are equal, wherein one sub-pixel is adjusted by a gray scale, and the gray scale of the entire display area is adjusted by 1/M gray scale. . Therefore, smoother and finer brightness adjustment can be achieved under the existing technical conditions without increasing the cost.
  • the brightness at the spot is higher than that in other areas, so the human eye can perceive the presence of the spot.
  • the brightness is lowered to reduce the reference brightness. The gap, thereby diluting the spot and even eliminating the spot.
  • the present invention compensates only for the occurrence of the spot area under the condition of the reference brightness (e.g., the white picture in which the entire panel displays the same brightness).
  • the spot algorithm is a method for correcting the brightness according to the position of the spot, and accurately compensates for the pixels in the spot or the pixels of the customized display area. Therefore, the present invention uses the offset value to locate the spot area, and then inputs the computing resources. Correction and compensation to the spot area does not need to consider the uniformity of the entire panel, thereby reducing the amount of calculation, which is advantageous for reducing the cost and improving the response speed of the liquid crystal panel.
  • 1 is a schematic diagram showing the relationship between brightness and position corresponding to the offset value of the spot
  • FIG. 2 is a schematic view showing a driving method of a liquid crystal panel of the present invention
  • FIG. 3 is a schematic view of a method for compensating a spot of a liquid crystal panel of the present invention
  • FIG. 4 is a schematic block diagram of a driving circuit of a liquid crystal panel of the present invention.
  • FIG. 5 is a schematic diagram showing the relationship between brightness and position corresponding to the compensation value of the spot according to the embodiment of the present invention
  • FIG. 6 is a schematic diagram of relationship between brightness and position after compensation according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a table unit for storing a spot corresponding compensation value according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a table unit for storing physical locations of pixels according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a display area and a transition section according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of an effect of performing compensation for each pixel according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram showing the effect of compensation for each display area according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of the principle of the driving circuit of the liquid crystal panel of the embodiment of the present invention.
  • the invention discloses a driving method of a liquid crystal panel and a spot compensation method of the liquid crystal panel.
  • the driving method of the liquid crystal panel includes the step S1: driving the panel according to the physical position of the pixel and the compensation value corresponding to the pixel; wherein the compensation value is opposite to the brightness at the spot of the liquid crystal panel before compensating The offset value of the reference brightness corresponds.
  • the method for compensating the liquid crystal panel before the method for compensating the spot of the liquid crystal panel includes the steps of: Sl, obtaining a compensation value according to the deviation value of the pixel brightness from the reference brightness; S2, storing the compensation value and the position of the corresponding pixel to The liquid crystal panel is configured to superimpose a corresponding compensation value when the display data of the pixel is outputted by the liquid crystal panel.
  • the present invention also discloses a driving circuit 1 for a liquid crystal panel, comprising a memory module 10 storing physical positions of pixels of liquid crystal panels and compensation values corresponding to pixels, and compensation according to physical positions of pixels and corresponding pixels.
  • the operation module 20 for driving the panel wherein the compensation value corresponds to an offset value of the brightness at the spot of the liquid crystal panel before compensation with respect to the reference brightness.
  • the brightness at the spot is higher than that in other areas, so the human eye can perceive the presence of the spot.
  • the brightness is lowered to reduce the reference brightness.
  • the gap thereby diluting the spot and even eliminating the spot.
  • the invention is based on the condition of the reference brightness (for example, the white panel with the same brightness on the entire panel), only for the spot area make up.
  • the spot algorithm is a method for correcting the brightness according to the position of the spot, and accurately compensates for the pixels in the spot or the pixels of the customized display area.
  • the present invention uses the offset value to locate the spot area, and then inputs the computing resources. Correction and compensation to the spot area does not need to consider the uniformity of the entire panel, thereby reducing the amount of calculation, which is advantageous for reducing the cost and improving the response speed of the liquid crystal panel.
  • the driving method of the liquid crystal panel includes the steps of: driving the panel according to the physical position of the pixel and the compensation value corresponding to the pixel; wherein the compensation value is offset with the brightness of the light spot of the liquid crystal panel before compensating with respect to the reference brightness correspond.
  • the absolute value of the compensation value and the offset value are equal. As shown in Figure 5, the compensation value and the offset value are equal in magnitude and opposite in direction. The absolute value of the compensation value and the offset value are equal. The offset value can be completely corrected to eliminate the spot. See Figure 6 for the effect of compensation.
  • the position and the compensation value of each pixel are stored in advance in the table unit.
  • the compensation value is superimposed on the display data corresponding to the display area.
  • the position and compensation value of the pixel are stored in the table unit in advance, and the corresponding compensation value can be directly read from the table unit when the actual display is performed, and the complicated operation process is not required, which is advantageous for improving the response speed.
  • the table cells can be stored in the EEPROM with 255 gray levels per pixel. To save the EEPROM's memory capacity, an address and compensation value can be shared by 8 gray levels.
  • Each pixel includes a plurality of sub-pixels, and one display area is formed by grouping M sub-pixels, and each display area further has a jitter value, and display data of N sub-pixels in each display area is increased or decreased after superimposing the compensation value.
  • a minimum grayscale unit, where M and N are positive integers, and N ⁇ M, M is greater than or equal to four. The following takes M 4 as an example.
  • a display area 81 is formed by grouping 4 sub-pixels, and each display area 81 has a jitter value N, and display data of N sub-pixels in each display area is increased or decreased after superimposing the compensation value.
  • a minimum grayscale unit where N is a positive integer and N ⁇ 4.
  • the liquid crystal panel adjusts the brightness value by gray scale.
  • the minimum adjustment unit of each sub-pixel is a gray scale. If a single sub-pixel is desired to achieve finer gray scale adjustment, the cost and technical difficulty will be doubled.
  • This embodiment will have multiple sub-pixels As a display area 81, it is assumed that the luminances of the four sub-pixels are equal, and one sub-pixel is adjusted by one gray scale, and the gray scale of the entire display area 81 is adjusted by 1/4 gray scale. Therefore, smoother and finer brightness adjustment can be achieved under the existing technical conditions without increasing the cost.
  • the two jitter values are preferably different, so the transition of brightness is more smooth.
  • the LCD panel is driven, if the displayed sub-pixel has both the compensation value and the jitter value, increase or decrease a minimum gray scale unit after displaying the data overlay compensation value.
  • the spot has two adjacent areas that need to compensate for very little brightness (such as a gray level), there is still a clear dividing line between the two areas, which affects the display quality.
  • a plurality of transition sections 80 can be established between the two sections. Since the transition section 80 is composed of the display area 81, the display area 81 can provide finer brightness adjustment, and the brightness of the display area 81 of the transition section 80 is Incremental relationships can result in a smooth transition of brightness, dimming the boundaries between the two areas, and improving display quality.
  • the gray scale of the three sub-pixels in the fourth display area 81 in each transition section 80 is 50.
  • One is 51, so that the brightness of the entire fourth display area 81 is 50.25; for the same reason, the third display area 81 has 2 sub-pixel gray scales of 50, and two of them are 51, so that the entire third display area 81 The brightness is 50.5; and so on.
  • the compensation table is the whole unit Grayscale value, (for example, the grayscale to be compensated for a pixel at position 20 is 51; and until the position 27, the grayscale to be compensated is 52, then the positions of 20-26 can all be performed with grayscale 51 Compensation, but such compensation is coarser and less detailed.) If the compensation is to be more delicate, the above-described display area 81 and transition interval 80 are used to simulate a more detailed gray scale distribution by the combination of sub-pixels.
  • sub-pixels including the steps of each display area of the present invention are not limited to four, and the more sub-pixels, the finer the control of the gray scale.
  • the smallest display unit of the LCD panel is a sub-pixel.
  • each sub-pixel can also be assigned a compensation value.
  • the pixel is the basic imaging unit of the liquid crystal panel. Therefore, it is also feasible to compose the display area in units of pixels, which is beneficial to ensure image integrity. Referring to FIG. 10, according to each pixel or sub-pixel compensation, the boundaries of different regions of the spot are obvious, and the compensation effect is as shown in FIG. 11 , and the brightness change in the visible spot tends to be gentle, and the display effect is more. good.
  • the invention discloses a driving circuit of an LCD-based liquid crystal panel.
  • the storage module includes a storage module including a first storage unit 11 for storing a physical address of each pixel, a first storage unit 11 for selecting an EEPROM, a second storage unit 12 for storing each pixel compensation value, and a second storage unit 12 for selecting an SRAM;
  • the PC interface unit 30 for reading the storage unit data is sequentially connected in series between the first storage unit 11 and the operation module, and the storage unit data is decoded, and the position information of the pixel is transmitted to the position decoding unit 40 of the operation module;
  • Also coupled are a data stream receiving module 50, a second memory unit 12, and an interpolation operation unit 60, and the interpolation operation unit 60 is coupled to the video data stream transmitting module 70.
  • the video data stream transmitting module 70 loads the processed video data into the data lines of the liquid crystal panel.
  • the first storage unit 11 copies the compensation value of each pixel to the second storage unit 12, and the operation module reads the display data of the data stream receiving module 50, and compares with the physical address of the pixel output by the position decoding unit 40. If the position of the display data belongs to the pixel position corresponding to the spot, the running module reads the compensation value of the corresponding pixel from the second storage unit 12, superimposes the compensation value on the display data, and sends it to the difference calculation module 20. If the grayscale values of two adjacent sub-pixels in the spot area are greater than 0.25, a display area is formed by grouping 4 sub-pixels, and each display area further has a jitter value N, and the interpolation operation unit 60 is in each display area. The superimposed offset value is added to the display data of the N sub-pixels to increase or decrease a minimum gray scale unit, where N is a positive integer and N ⁇ 4.
  • the liquid crystal panel adjusts the brightness value by gray scale.
  • the minimum adjustment unit of each sub-pixel is a gray scale. If a single sub-pixel is desired to achieve finer gray scale adjustment, the cost and technical difficulty will be doubled.
  • the technical solution adjusts a plurality of sub-pixels as one display area, and assumes that the brightness of the M sub-pixels are equal, wherein one sub-pixel is adjusted by a gray scale, and the gray scale of the entire display area is adjusted by 1/M gray scale. . Therefore, smoother and finer brightness adjustment can be achieved under the existing technical conditions without increasing the cost.
  • the SRAM data access speed is much larger than the EEPROM. Therefore, the compensation value can be copied to the SRAM after power-on.
  • the arithmetic module directly reads the compensation value from the SRAM to perform calculations, improves the operation efficiency, and can compensate the original video data in time to improve the response. speed.
  • sub-pixels included in each display area of the present invention are not limited to four, and the more sub-pixels, the finer the control of the gray scale.
  • each sub-pixel can also be assigned a compensation value.
  • the image display is generally in units of pixels, and each pixel includes three sub-pixels. Therefore, it is also feasible that a pixel composed of three sub-pixels corresponds to one compensation value.
  • the driving circuit of the present invention can also be based on a platform such as a single chip microcomputer or a DSP, and the memory module is not limited to the EEPROM and the SRAM.

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Abstract

一种液晶面板的驱动方法，该驱动方法包括步骤：根据像素的物理位置及像素对应的补偿值对面板进行驱动；其中，所述的补偿值与补偿前液晶面板的光斑处的亮度相对于基准亮度的偏移值相对应。

Description

一种液晶面板驱动方法、 液晶显示装置和光斑补偿方法
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种液晶面板驱动方法、 液 晶显示装置和光斑补偿方法。
【背景技术】
TFT制造过程中， 曝光是很重要的一个制程。 在超大尺寸液晶面板的制造 过程中， 由于曝光机台尺寸的限制， 会分区曝光， 在曝光区的交界处会产生带 状的、 不均匀的光斑 (lens mura) (如图 1所示）， 光斑造成画面不均匀， 影响显 示品质。
【发明内容】
本发明所要解决的技术问题是提供一种能改善液晶面板光斑效应的液晶面 板驱动方法、 液晶显示装置和光斑补偿方法。
本发明的目的是通过以下技术方案来实现的：
一种液晶面板的驱动方法， 包括步骤：
根据像素的物理位置及像素对应的补偿值对面板进行驱动；
其中， 所述的补偿值与补偿前液晶面板的光斑处的亮度相对于基准亮度的 偏移值相对应。
进一步的， 所述补偿值和偏移值的绝对值相等。 偿值和偏移值的绝对值相 等可以完全校正偏移值， 消除光斑。
进一步的， 将每个像素的位置和补偿值预先存储在表单元， 在驱动液晶面 板显示时， 从表单元读取补偿值后， 将补偿值叠加到对应显示区域的显示数据。 预先将像素的位置和补偿值存储到表单元， 在实际显示的时候直接从表单元读 取相应的补偿值即可， 无须进行复杂的运算过程， 有利于提高响应速度。
进一步的， 所述每个像素包括多个子像素， 以 M个子像素为一组形成一个 显示区域， 每个显示区域还对应有一个抖动值， 每个显示区域有 N个子像素的 显示数据在叠加补偿值后增加或减少一个最小灰阶单位， 其中 M、 N都是正整 数， 且 N < M, M 大于或等于四。 液晶面板通过灰阶来调节亮度值， 每个子像 素的最小的调节单位为一个灰阶， 基于单个子像素想实现更精细化的灰阶调整， 成本和技术难度都会倍增。 本技术方案将多个子像素作为一个显示区域进行调 整， 假设 M个子像素的亮度都相等， 其中一个子像素的调整了一个灰阶， 此时 整个显示区域的灰阶就调整了 1/M灰阶。 因此， 无须增加成本， 在现有的技术 条件下即可实现更平滑、 精细的亮度调节。
进一步的， 以相邻的 M个显示区域为单位， 形成一个过渡区间， 每个过渡 区间内 M个显示区域的抖动值 N分别等于 0 ~ ( M-1 ) , 根据其物理位置依次递 增或递减。如果光斑有两个相邻片区需要补偿的亮度很小 (比如相隔一个灰阶）， 那么在两个片区之间仍然存在明显的分界线， 影响显示品质。 此时可以在两个 片区之间设立多个过渡区间， 由于过渡区间是由显示区域来组成， 显示区域可 以提供更为精细的亮度调整， 过渡区间的显示区域的亮度呈递增关系， 就能造 成平滑的亮度过渡效果， 淡化两个片区之间的界限， 从而改善显示品质。
进一步的， 如相邻两个像素的灰阶值大于预设的阈值， 以 M个像素为一组 形成一个显示区域， 每个显示区域还对应有一个抖动值， 每个显示区域有 N个 像素的显示数据在叠加补偿值后增加或减少一个最小灰阶单位， 其中 M、 N都 是正整数， 且 N < M。 像素是液晶面板基本的成像单元， 因此以像素为单位组建 显示区域， 有利于保障图像的完整性。
一种液晶面板的驱动电路， 包括存储有液晶面板像素的物理位置及像素对 应的补偿值的存储模块、 根据像素的物理位置及像素对应的补偿值对面板进行 驱动的运算模块； 其中， 所述的补偿值与补偿前液晶面板的光斑处的亮度相对 于基准亮度的偏移值相对应。
进一步的， 所述存储单元包括存储每个像素物理地址及其对应补偿值的、 采用 EEPROM的第一存储单元，存储每个像素补偿值的、采用 SRAM的第二存 储单元； 第一存储单元和运算模块之间依次串接有读取存储单元数据的 I2 C接 口单元， 对存储单元数据进行解码、 并将像素的位置信息传递给运算模块的位 置解码单元； 运算模块还分别耦合有数据流接收模块、 第二存储单元和插值运 算单元， 插值运算单元耦合有视频数据流发送模块；
通电以后， 第一存储单元将每个像素的补偿值复制到第二存储单元， 运算 模块读取数据流接收模块的显示数据， 跟位置解码单元的输出的像素物理地址 进行比对， 如果显示数据的位置属于光斑对应的像素位置， 运行模块从第二存 储单元读取对应像素的补偿值， 将补偿值叠加到显示数据， 一并发送到差值运 算单元；
如果光斑区域中相邻两个子像素的灰阶值大于预设的阈值， 以 M个子像素 为一组形成一个显示区域， 每个显示区域还对应有一个抖动值 N, 每个显示区 域有 N个子像素的显示数据在叠加补偿值后增加或减少一个最小灰阶单位， 其 中 M、 N都是正整数， J- N < M, M大于或等于四。
液晶面板通过灰阶来调节亮度值， 每个子像素的最小的调节单位为一个灰 阶， 基于单个子像素想实现更精细化的灰阶调整， 成本和技术难度都会倍增。 本技术方案将多个子像素作为一个显示区域进行调整， 假设 M个子像素的亮度 都相等， 其中一个子像素的调整了一个灰阶， 此时整个显示区域的灰阶就调整 了 1/M灰阶。 因此， 无须增加成本， 在现有的技术条件下即可实现更平滑、 精 细的亮度调节。 SRAM数据存取速度远大于 EEPROM, 因此可以在通电后将补 偿值复制到 SRAM中， 运算模块直接从 SRAM读取补偿值进行运算， 提高了运 算效率， 能及时对原始视频数据进行补偿， 提高响应速度。
一种液晶面板的光斑补偿方法， 包括步骤：
根据像素亮度跟基准亮度的偏差值获得补偿值；
将补偿值及对应像素的位置存储到液晶面板， 以供在液晶面板输出像素的 显示数据时叠加对应的补偿值。
进一步的， 确定最近的两个灰阶差值为最小灰阶单位的两个像素位置； 确认此两个像素之间间隔的像素的个数及位置；
当间隔的像素个数超过阈值 Y时， 则进行抖动值的计算：
其中， 先预设一个 M; M<Y; 计算此两个像素之间的每个像素对应的抖动 值， 使得此两个像素之间的灰阶以 M个像素为一组均勾过渡。 液晶面板通过灰 阶来调节亮度值， 每个子像素的最小的调节单位为一个灰阶， 基于单个子像素 想实现更精细化的灰阶调整， 成本和技术难度都会倍增。 本技术方案将多个子 像素作为一个显示区域进行调整， 假设 M个子像素的亮度都相等， 其中一个子 像素的调整了一个灰阶， 此时整个显示区域的灰阶就调整了 1/M灰阶。 因此， 无须增加成本， 在现有的技术条件下即可实现更平滑、 精细的亮度调节。
光斑处的亮度会比其他区域的亮度偏高， 因此人眼可以感知光斑的存在。 本发明由于先通过将所有像素的亮度跟一基准亮度比较， 只要该亮度跟基准亮 度比较产生的偏移值超过误差范围， 即对应增加一个补偿值， 将该亮度拉低， 以便缩小跟基准亮度的差距， 从而淡化光斑甚至消除光斑。
本发明在基准亮度的条件下（比如整个面板显示亮度一致的白色画面）， 仅 针对出现光斑区域进行补偿。 光斑算法是根据光斑的位置亮度进行修正的方法， 且针对光斑内的具体像素或自定义的显示区域的像素进行精确补偿， 因此， 本 发明采用偏移值来定位光斑区域， 然后将运算资源投入到光斑区域的修正、 补 偿， 无须考虑整个面板的均匀性， 从而减少了计算量， 有利于降低成本， 提高 液晶面板的响应速度。
【附图说明】
图 1是光斑的偏移值对应的亮度和位置关系示意图；
图 2是本发明液晶面板的驱动方法示意图；
图 3是本发明液晶面板的光斑补偿方法示意图；
图 4是本发明液晶面板的驱动电路原理框图；
图 5是本发明实施例光斑的补偿值对应的亮度和位置关系示意图； 图 6是本发明实施例补偿后的亮度和位置关系示意图；
图 7是本发明实施例存储光斑对应补偿值的表单元示意图；
图 8是本发明实施例存储像素物理位置的表单元示意图；
图 9是本发明实施例显示区和过渡区间的示意图；
图 10是本发明实施例针对每个像素进行补偿的效果示意图；
图 11是本发明实施例针对每个显示区域进行补偿的效果示意图； 图 12是本发明实施例针液晶面板的驱动电路的原理示意图。
【具体实施方式】
本发明公开了一种液晶面板的驱动方法和液晶面板的光斑补偿方法。
如图 2所示， 液晶面板的驱动方法包括步骤 S1: 根据像素的物理位置及像 素对应的补偿值对面板进行驱动； 其中， 所述的补偿值与补偿前液晶面板的光 斑处的亮度相对于基准亮度的偏移值相对应。
如图 3 所示， 液晶面板的驱动方法之前还有液晶面板的光斑补偿方法包括 步骤： Sl、 根据像素亮度跟基准亮度的偏差值获得补偿值； S2、 将补偿值及对 应像素的位置存储到液晶面板， 以供在液晶面板输出像素的显示数据时叠加对 应的补偿值。
如图 4所示， 本发明还公开了一种液晶面板的驱动电路 1 , 包括存储有液晶 面板像素的物理位置及像素对应的补偿值的存储模块 10、 根据像素的物理位置 及像素对应的补偿值对面板进行驱动的运算模块 20; 其中， 所述的补偿值与补 偿前液晶面板的光斑处的亮度相对于基准亮度的偏移值相对应。
光斑处的亮度会比其他区域的亮度偏高， 因此人眼可以感知光斑的存在。 本发明由于先通过将所有像素的亮度跟一基准亮度比较， 只要该亮度跟基准亮 度比较产生的偏移值超过误差范围， 即对应增加一个补偿值， 将该亮度拉低， 以便缩小跟基准亮度的差距， 从而淡化光斑甚至消除光斑。 本发明在基准亮度 的条件下（比如整个面板显示亮度一致的白色画面）， 仅针对出现光斑区域进行 补偿。 光斑算法是根据光斑的位置亮度进行修正的方法， 且针对光斑内的具体 像素或自定义的显示区域的像素进行精确补偿， 因此， 本发明采用偏移值来定 位光斑区域， 然后将运算资源投入到光斑区域的修正、 补偿， 无须考虑整个面 板的均匀性， 从而减少了计算量， 有利于降低成本， 提高液晶面板的响应速度。
下面结合附图和较佳的实施例对本发明作进一步说明。
液晶面板的驱动方法包括步骤： 根据像素的物理位置及像素对应的补偿值 对面板进行驱动； 其中， 所述的补偿值与补偿前液晶面板的光斑处的亮度相对 于基准亮度的偏移值相对应。
所述补偿值和偏移值的绝对值相等。 如图 5 所示， 补偿值和偏移值大小相 等， 方向相反。 补偿值和偏移值的绝对值相等可以完全校正偏移值， 消除光斑， 补偿后的效果参见图 6。
如图 7和 8所示， 将每个像素的位置和补偿值预先存储在表单元， 在驱动 液晶面板显示时， 从表单元读取补偿值后， 将补偿值叠加到对应显示区域的显 示数据。 预先将像素的位置和补偿值存储到表单元， 在实际显示的时候直接从 表单元读取相应的补偿值即可， 无须进行复杂的运算过程， 有利于提高响应速 度。表单元可以存储到 EEPROM中，每个像素有 255个灰阶，为了节省 EEPROM 的存储容量， 可以 8个灰阶共用一个地址和补偿值。
每个像素包括多个子像素， 以 M个子像素为一组形成一个显示区域， 每个 显示区域还对应有一个抖动值， 每个显示区域有 N个子像素的显示数据在叠加 补偿值后增加或减少一个最小灰阶单位， 其中 M、 N都是正整数， 且N < M, M 大于或等于四。 下面以 M=4为例说明。
如图 9所示， 以 4个子像素为一组形成一个显示区域 81 , 每个显示区域 81 都有一个抖动值 N, 每个显示区域有 N个子像素的显示数据在叠加补偿值后增 加或减少一个最小灰阶单位， 其中 N是正整数， 且N < 4。 液晶面板通过灰阶来 调节亮度值， 每个子像素的最小的调节单位为一个灰阶， 基于单个子像素想实 现更精细化的灰阶调整， 成本和技术难度都会倍增。 本实施方式将多个子像素 作为一个显示区域 81进行调整， 假设 4个子像素的亮度都相等， 其中一个子像 素的调整了一个灰阶， 此时整个显示区域 81的灰阶就调整了 1/4灰阶。 因此， 无须增加成本， 在现有的技术条件下即可实现更平滑、 精细的亮度调节。
选择多少个子像素来组成一个显示区域， 由最近的两个灰阶差值为最小灰 阶单位的两个像素位置来决定， 先确认此两个像素之间间隔的像素的个数及位 置， 当间隔的像素个数超过阈值 Y时， 则进行抖动值的计算：
其中， 先预设一个 M; M<Y; 计算最近的两个灰阶差值为最小灰阶单位的 像素之间的每个像素对应的抖动值， 使得此两个像素之间的灰阶以 M个像素为 一组均勾过渡。
比如 Υ=8 , 则可以选择 Μ=4 , 则两像素之间间隔两个显示区域， 然后在两 个显示区域中各选择一个抖动值， 两个抖动值最好不一样， 这样亮度的过渡更 平滑。 确定好抖动值及其对应的像素位置以后， 将抖动值和补偿值写入液晶面 板中。 液晶面板驱动时， 如果显示的子像素同时具有补偿值和抖动值， 在其显 示数据叠加补偿值后增加或减少一个最小灰阶单位。
如果光斑有两个相邻片区需要补偿的亮度很小 （比如相隔一个灰阶）， 但是 在两个片区之间仍然存在明显的分界线， 影响显示品质。 此时可以在两个片区 之间设立多个过渡区间 80, 由于过渡区间 80是由显示区域 81来组成， 显示区 域 81可以提供更为精细的亮度调整， 过渡区间 80的显示区域 81的亮度呈递增 关系， 就能造成平滑的亮度过渡效果， 淡化两个片区之间的界限， 从而改善显 示品质。
假设每个子像素的最小补偿灰阶 A g为 1个灰阶， 当前显示灰阶 G为 51 , 则每个过渡区间 80内的第 4个显示区域 81中有 3个子像素的灰阶为 50, 有 1 个是 51 , 这样整个第 4显示区域 81的亮度即为 50.25; 同理， 第 3个显示区域 81有 2个子像素灰阶为 50, 有 2个是 51 , 这样整个第 3显示区域 81的亮度即 为 50.5; 以此类推。
当在对以位置为单位的灰阶进行补偿时， 由于补偿表中记载的是整单位的 灰阶值， （比如， 在位置为 20的像素需补偿的灰阶是 51; 而直到位置 27, 其需 要补偿的灰阶是 52, 那么可以将 20-26的位置全部用灰阶 51来进行补偿， 但是 这样的补偿较为粗略， 不够细致） 而如果要想补偿的更细腻， 使用上述显示区 域 81和过渡区间 80的方法， 通过子像素的组合模拟更为细致的灰阶分布。
当然， 本发明每个显示区域的包括步骤的子像素不局限于 4个， 子像素越 多， 灰阶的控制越细腻。
液晶面板最小的显示单元为子像素， 为了实现精准的亮度控制， 也可以每 个子像素对应一个补偿值。 像素是液晶面板基本的成像单元， 因此， 以像素为 单位组建显示区域进行补偿也是可行的， 有利于保障图像的完整性。 参见图 10, 依据每个像素或子像素进行补偿， 光斑的不同片区的界限明显， 而采用插值补 偿的方法， 其补偿效果如图 11所示， 可见光斑内亮度变化趋于平緩， 显示效果 更佳。
实施例二
如图 12所示， 本发明公开的一种基于 FPGA的液晶面板的驱动电路。 该驱 动电路包括的存储模块包括存储每个像素物理地址的第一存储单元 11 , 第一存 储单元 11选用 EEPROM; 存储每个像素补偿值的第二存储单元 12; 第二存储 单元 12选用 SRAM; 第一存储单元 11和运算模块之间依次串接有读取存储单 元数据的 P C接口单元 30, 对存储单元数据进行解码、 并将像素的位置信息传 递给运算模块的位置解码单元 40; 运算模块还分别耦合有数据流接收模块 50、 第二存储单元 12和插值运算单元 60, 插值运算单元 60耦合有视频数据流发送 模块 70。视频数据流发送模块 70将处理后的视频数据加载到液晶面板的数据线。
通电以后， 第一存储单元 11将每个像素的补偿值复制到第二存储单元 12, 运算模块读取数据流接收模块 50的显示数据， 跟位置解码单元 40输出的像素 物理地址进行比对， 如果显示数据的位置属于光斑对应的像素位置， 运行模块 从第二存储单元 12读取对应像素的补偿值， 将补偿值叠加到显示数据， 一并发 送到差值运算模块 20。 如果光斑区域中相邻两个子像素的灰阶值大于 0.25, 以 4个子像素为一组 形成一个显示区域， 每个显示区域还对应有一个抖动值 N, 插值运算单元 60在 每个显示区域的 N个子像素的显示数据中叠加补偿值后增加或减少一个最小灰 阶单位， 其中 N是正整数， 且N < 4。
液晶面板通过灰阶来调节亮度值， 每个子像素的最小的调节单位为一个灰 阶， 基于单个子像素想实现更精细化的灰阶调整， 成本和技术难度都会倍增。 本技术方案将多个子像素作为一个显示区域进行调整， 假设 M个子像素的亮度 都相等， 其中一个子像素的调整了一个灰阶， 此时整个显示区域的灰阶就调整 了 1/M灰阶。 因此， 无须增加成本， 在现有的技术条件下即可实现更平滑、 精 细的亮度调节。 SRAM数据存取速度远大于 EEPROM , 因此可以在通电后将补 偿值复制到 SRAM中， 运算模块直接从 SRAM读取补偿值进行运算， 提高了运 算效率， 能及时对原始视频数据进行补偿， 提高响应速度。
当然， 本发明每个显示区域所包括的子像素不局限于 4个， 子像素越多， 灰阶的控制越细腻。
液晶面板最小的显示单元为子像素， 为了实现精准的亮度控制， 也可以每 个子像素对应一个补偿值。 图像显示一般以像素为单位， 每个像素包括三个子 像素， 因此， 以三个子像素构成的像素对应一个补偿值也是可行的。
本发明的驱动电路还可以基于单片机、 DSP 等平台， 存储模块也不局限于 EEPROM和 SRAM。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通 技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替 换， 都应当视为属于本发明的保护范围。

Claims

权利要求
1. 一种液晶面板的驱动方法， 包括步骤： 根据像素的物理位置及像素 对应的补偿值对面板进行驱动； 其中， 所述的补偿值与补偿前液晶面板的 光斑处的亮度相对于基准亮度的偏移值相对应。
2. 如权利要求 1所述的液晶面板的驱动方法， 其中， 所述每个像素包 括多个子像素， 以 M个子像素为一组形成一个显示区域， 每个显示区域还 对应有一个抖动值 N, 每个显示区域有 N个子像素的显示数据在叠加补偿 值后增加或减少一个最小灰阶单位， 其中 M、 N都是正整数， 且N < M, M大于或等于四。
3. 如权利要求 2所述的液晶面板的驱动方法， 其中， 以相邻的 M个显 示区域为单位， 形成一个过渡区间， 每个过渡区间内 M个显示区域的抖动 值 N分别等于 0 ~ ( M-1 ), ^据其物理位置依次递增或递减。
4. 如权利要求 1所述的液晶面板的驱动方法， 其中， 所述补偿值和偏 移值的绝对值相等。
5. 如权利要求 4所述的液晶面板的驱动方法， 其中， 所述每个像素包 括多个子像素， 以 M个子像素为一组形成一个显示区域， 每个显示区域还 对应有一个抖动值 N, 每个显示区域有 N个子像素的显示数据在叠加补偿 值后增加或减少一个最小灰阶单位， 其中 M、 N都是正整数， 且N < M, M大于或等于四。
6. 如权利要求 5所述的液晶面板的驱动方法， 其中， 以相邻的 M个显 示区域为单位， 形成一个过渡区间， 每个过渡区间内 M个显示区域的抖动 值 N分别等于 0 ~ ( M-1 ), ^据其物理位置依次递增或递减。
7. 如权利要求 1所述的液晶面板的驱动方法， 其中， 将像素的位置和 补偿值预先存储在表单元， 在驱动液晶面板显示时， 从表单元读取补偿值 后， 将补偿值叠加到对应显示区域的显示数据。
8. 如权利要求 7所述的液晶面板的驱动方法， 其中， 所述每个像素包 括多个子像素， 以 M个子像素为一组形成一个显示区域， 每个显示区域还 对应有一个抖动值 N, 每个显示区域有 N个子像素的显示数据在叠加补偿 值后增加或减少一个最小灰阶单位， 其中 M、 N都是正整数， 且N < M, M大于或等于四。
9. 如权利要求 8所述的液晶面板的驱动方法， 其中， 以相邻的 M个显 示区域为单位， 形成一个过渡区间， 每个过渡区间内 M个显示区域的抖动 值 N分别等于 0 ~ ( M-1 ), ^据其物理位置依次递增或递减。
10. 如权利要求 1所述的液晶面板的驱动方法，其中，如相邻两个像素 的灰阶值大于预设的阈值， 以 M个像素为一组形成一个显示区域， 每个显 示区域还对应有一个抖动值， 每个显示区域有 N个像素的显示数据在叠加 补偿值后增加或减少一个最小灰阶单位， 其中 M、 N都是正整数， 且N < M。
11. 一种液晶面板的驱动电路，其中， 包括存储有液晶面板像素的物理 位置及像素对应的补偿值的存储模块、 根据像素的物理位置及像素对应的 补偿值对面板进行驱动的运算模块； 其中， 所述的补偿值与补偿前液晶面 板的光斑处的亮度相对于基准亮度的偏移值相对应。
12. 如权利要求 11所述的液晶面板的驱动电路， 其中， 所述存储单元 包括存储每个像素物理地址及其对应补偿值的、采用 EEPROM的第一存储 单元， 存储每个像素补偿值的、 采用 SRAM的第二存储单元； 第一存储单 元和运算模块之间依次串接有读取存储单元数据的 P C接口单元， 对存储 单元数据进行解码、并将像素的位置信息传递给运算模块的位置解码单元； 运算模块还分别耦合有数据流接收模块、 第二存储单元和插值运算单元， 插值运算单元耦合有视频数据流发送模块；
通电以后， 第一存储单元将每个像素的补偿值复制到第二存储单元， 运算模块读取数据流接收模块的显示数据， 跟位置解码单元的输出的像素 物理地址进行比对， 如果显示数据的位置属于光斑对应的像素位置， 运行 模块从第二存储单元读取对应像素的补偿值， 将补偿值叠加到显示数据， 一并发送到差值运算单元；
如果光斑区域中相邻两个子像素的灰阶值大于预设的阈值， 以 M个子 像素为一组形成一个显示区域， 每个显示区域还对应有一个抖动值 N, 每 个显示区域有 N个子像素的显示数据在叠加补偿值后增加或减少一个最小 灰阶单位， 其中 M、 N都是正整数， J- N < M, M大于或等于四。
13. 一种液晶面板的光斑补偿方法， 包括步骤：
根据像素亮度跟基准亮度的偏差值获得补偿值；
将补偿值及对应像素的位置存储到液晶面板， 以供在液晶面板输出像 素的显示数据时叠加对应的补偿值。
14. 如权利要求 13所述的一种液晶面板的光斑补偿方法， 其中， 确定最近的两个灰阶差值为最小灰阶单位的两个像素位置；
确认此两个像素之间间隔的像素的个数及位置；
当间隔的像素个数超过阈值 Y时， 则进行抖动值的计算：
其中， 先预设一个 M; M<Y; 计算此两个像素之间的每个像素对应的 抖动值， 使得此两个像素之间的灰阶以 M个像素为一组均匀过渡。
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