WO2020118927A1 - 显示面板的驱动方法和显示面板 - Google Patents

显示面板的驱动方法和显示面板 Download PDF

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WO2020118927A1
WO2020118927A1 PCT/CN2019/077605 CN2019077605W WO2020118927A1 WO 2020118927 A1 WO2020118927 A1 WO 2020118927A1 CN 2019077605 W CN2019077605 W CN 2019077605W WO 2020118927 A1 WO2020118927 A1 WO 2020118927A1
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value
image
frame
color saturation
display panel
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PCT/CN2019/077605
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English (en)
French (fr)
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李嘉航
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惠科股份有限公司
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Priority to US16/982,045 priority Critical patent/US11250797B2/en
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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
    • 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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • 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 application relates to the field of display devices, and in particular, to a display panel driving method and a display panel.
  • liquid crystal display which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel opposing glass substrates, and apply a driving voltage to the two glass substrates to control the rotation direction of the liquid crystal molecules, so as to refract the light of the backlight module to generate a picture.
  • a thin film transistor liquid crystal display includes a liquid crystal panel and a backlight module.
  • the liquid crystal panel includes a color filter substrate (Color Filter Substrate, CF Substrate, also known as a color filter substrate), a thin film transistor array substrate (Thin Film Transistor Substrate, TFT Substrate) With a mask, there are transparent electrodes on the opposite inner side of the substrate. A layer of liquid crystal molecules (Liquid Crystal, LC) is sandwiched between the two substrates.
  • the gamma curve is the most important photoelectric conversion curve of a TV.
  • the value of the gamma curve of the TV will be designed at 2.2 in order to effectively compensate the current display system and make the eye get the best display effect.
  • Due to the LCD display The non-isophase nature of the LCD makes the positive viewing angle of the gamma curve different from the side viewing angle.
  • VA Multi-domain Vertica Alignment, multi-quadrant vertical alignment technology
  • the lateral viewing angle of the gamma curve is shifted too much.
  • the image quality of some images is obviously poor, so an improvement in the color shift of the LCD panel is very important for LCD monitors.
  • the key technologies of various image quality are all hope to improve this viewing angle characteristic.
  • the present application provides a display panel driving method and a display panel that improve the visual chromatic aberration characteristics of an LCD display.
  • the driving method includes the following steps:
  • the adjusted gamma curve value is used to drive the display panel.
  • the step of adjusting the panel gamma curve value according to the color difference of a frame of images includes:
  • the gamma curve value is adjusted down.
  • the step of adjusting the panel gamma curve value according to the color difference of a frame of images includes:
  • the original gamma curve value is retained.
  • the step of determining the degree of color difference of an image includes:
  • Each line of pixels counts the accumulated color saturation value to form line buffer data and store it in the line buffer;
  • the line buffer data of all lines is accumulated line by line to form frame buffer data
  • the maximum saturation value of each frame of image is used to determine the degree of color difference on behalf of a frame of image. A larger color saturation value indicates a greater degree of color difference.
  • the step of calculating the color saturation of each pixel in a frame of image to form a color saturation value includes:
  • S max (R, G, B)-min (R, G, B) formula, where S represents the color saturation value, R represents the gray scale of the red sub-pixel, G represents the gray scale of the green sub-pixel, and B represents The gray level of the blue sub-pixel.
  • the data size of each color saturation value is less than or equal to 6 bits.
  • the pixels of each line in a frame of image are spaced at intervals of 32, and the color saturation of each pixel selected by the interval calculation forms a color saturation value.
  • the step of adjusting the panel gamma curve value according to the color difference of a frame of images includes:
  • the gamma adjustment look-up table is formed by setting a gamma adjustment value corresponding to each color saturation in advance;
  • the adjusted gamma curve value and the original gamma curve value have the largest difference in downward adjustment, and when the color saturation value is not equal to 60, the farther away from the adjusted gamma value The lower the difference between the horse curve value and the original gamma curve value is;
  • the gamma adjustment value conforms to the gamma equal to 2.2.
  • the present application also provides a driving method of a display panel.
  • the method includes the following steps:
  • Each line of pixels counts the accumulated color saturation value to form line buffer data and store it in the line buffer;
  • the line buffer data of all lines is accumulated line by line to form frame buffer data
  • the data size of each color saturation value is less than or equal to 6 bits.
  • the maximum saturation value of each frame of image is used to determine the degree of color difference on behalf of a frame of image. A larger color saturation value indicates a greater degree of color difference.
  • the gamma curve value is adjusted down.
  • the original gamma curve value is retained.
  • the adjusted gamma curve value is used to drive the display panel.
  • Another object of the present application is to disclose a display panel using the driving method of the display panel as described above.
  • the gamma curve value is an important parameter for driving the display panel.
  • the gamma curve value has an important decisive effect on the display effect of the screen.
  • the gamma curve is the most important photoelectric conversion curve of the TV.
  • the gamma curve of the TV will Designed in Gamma 2.2, it can effectively compensate the current display system and make the eye get the best display effect.
  • the gamma curve of the positive viewing angle of the LCD is different from the side viewing angle, especially VA
  • the deviation of the gamma curve of the side view angle is too large (as shown in FIG. 1), which is obviously poor in some image quality performances.
  • the inventors found that, generally speaking, the lower the gamma curve value, the smaller the visual role difference; the larger the gamma curve value, the larger the visual role difference. Therefore, we design an image analysis processing method to adjust the gamma for the content characteristics of the screen For the horse curve value, first input a frame of image to determine the degree of color difference of this frame image, adjust the value of the gamma curve value according to the degree of color difference, and use the adjusted gamma curve value to drive the display panel, so that the color difference When it is larger, the value of its gamma curve should be lowered to achieve the purpose of reducing chromatic aberration, thereby optimizing the display effect of the picture.
  • FIG. 1 is a schematic diagram of a viewing angle and a gamma curve value according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a color difference of skin color according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a multi-region pixel design according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a gamma curve value and visual color difference according to an embodiment of the present application
  • FIG. 5 is a schematic diagram of a dynamic gamma curve algorithm process according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of steps of a dynamic gamma curve adjustment method according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a gamma corresponding to the Smax value according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of steps of a method for driving a display panel according to an embodiment of the present application.
  • connection should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • installation should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • one way to improve the viewing angle of an LCD is to design a pixel design with 8 domains, so that the liquid crystal displays a symmetrical design in the pixel space to compensate for the optical phase difference caused by different viewing angles, as shown in the figure
  • using a multi-region pixel design method will not only increase the difficulty of pixel design, pixel routing, including electrodes, and TFT components, etc., for a pixel aperture ratio, will produce a reduction effect, Therefore, a method of improving the quality of the perspective through image processing is very important.
  • an embodiment of the present application discloses a driving method of a display panel.
  • the driving method includes the following steps:
  • the gamma curve value is an important parameter for driving the display panel.
  • the gamma curve value has an important decisive effect on the display effect of the screen.
  • the gamma curve is the most important photoelectric conversion curve of the TV.
  • the gamma curve value will be designed at gamma 2.2 to effectively compensate the current display system and make the eye get the best display effect.
  • the gamma curve and side of the LCD's positive viewing angle The angle of view is different, especially for the VA panel, the deviation of the gamma curve of the side angle of view is too large (as shown in Figure 1), which is obviously poor in some image quality performance.
  • the inventors found that, generally speaking, the lower the gamma curve value, the smaller the visual role difference; the larger the gamma curve value, the larger the visual role difference. Therefore, we design an image analysis processing method to adjust the gamma for the content characteristics of the screen For the horse curve value, first input a frame of image to determine the degree of color difference of this frame image, adjust the value of the gamma curve value according to the degree of color difference, and use the adjusted gamma curve value to drive the display panel, so that the color difference When it is larger, the value of its gamma curve should be lowered to achieve the purpose of reducing chromatic aberration, thereby optimizing the display effect of the picture.
  • the steps of adjusting the panel gamma curve according to the color difference of a frame of images include:
  • the gamma curve value is adjusted down.
  • the color difference degree of a frame of image is greater than or equal to the preset threshold value, the color difference has a greater influence at this time, we need to lower the gamma curve value, (for example, the color difference degree The value is equal to 0, that is, when there is no chromatic aberration, you can not adjust the gamma curve value, or at a viewing angle of 30 degrees, when the chromatic aberration is less than 0.02, no adjustment is required; and when the above range is exceeded, the chromatic aberration shift is greater, corresponding Lower the gamma curve value to a greater extent, thereby reducing chromatic aberration and optimizing the display effect of the picture).
  • the steps of adjusting the panel gamma curve according to the color difference of a frame of images include:
  • the original gamma curve value is retained.
  • the adjustment of the gamma curve value should refer to the preset threshold value. If the color difference of a frame of image is less than the preset threshold value, the color difference effect is not great at this time, we can keep the original gamma curve value; in this way, the adjustment can be reduced
  • the workload of the gamma curve value reduces the chromatic aberration while avoiding the useless work (for example, when the chromatic aberration is less than 0.02 at a viewing angle of 30 degrees).
  • the step of determining the degree of color difference of an image frame :
  • Each line of pixels counts the accumulated color saturation value to form line buffer data and store it in the line buffer;
  • the line buffer data of all lines is accumulated line by line to form frame buffer data
  • the maximum saturation value of each frame of image is used to determine the degree of color difference on behalf of a frame of image. A larger color saturation value indicates a greater degree of color difference.
  • the judgment of the color difference degree of each frame of image is an important step of this method.
  • the basis of its judgment should be sufficient, and the data obtained should be accurate.
  • Starting from obtaining the image signal of one frame of the progressive scan of the display calculate each The pixel's color saturation level forms the color saturation value, and then each line of pixels separately accumulates the color saturation value to form the line buffer data and stores it in the line buffer, and then the line buffer data of all lines is accumulated line by line to form the frame buffer data.
  • the step of calculating the color saturation level of each pixel in a frame of image to form a color saturation value includes:
  • S max(R,G,B)-min(R,G,B) formula, where S represents the color saturation value, R represents the hue of the red sub-pixel, G represents the hue of the green sub-pixel, and B represents the blue The hue of the subpixel.
  • pixels of each line in a frame of image are spaced at intervals of 32, and the color saturation degree of each pixel selected by the interval calculation is formed to form a color saturation value.
  • the step of adjusting the panel gamma curve value according to the color difference of a frame of images includes:
  • the gamma adjustment look-up table is formed by setting a gamma adjustment value respectively according to the color saturation in advance;
  • the adjusted gamma curve value and the original gamma curve value have the largest difference in downward adjustment, and when the color saturation value is not equal to 60, the farther away from the adjusted gamma value The lower the difference between the horse curve value and the original gamma curve value is;
  • a driving method of a display panel including the steps of:
  • the line buffer data of all lines is accumulated line by line to form frame buffer data
  • the data size of each color saturation value is less than or equal to 6 bits
  • the maximum saturation value of each frame of image is used to determine the degree of color difference on behalf of a frame of image. A larger color saturation value indicates a greater degree of color difference.
  • the gamma curve value is adjusted down.
  • the original gamma curve value is retained.
  • the adjusted gamma curve value is used to drive the display panel.
  • the judgment of the color difference degree of each frame of image is an important step of this method.
  • the basis of its judgment should be sufficient, and the data obtained should be accurate.
  • Starting from obtaining the image signal of one frame of the progressive scan of the display calculate each The pixel's color saturation level forms the color saturation value, and then each line of pixels separately accumulates the color saturation value to form the line buffer data and stores it in the line buffer, and then the line buffer data of all lines is accumulated line by line to form the frame buffer data. Comparing all the color saturation values in the frame buffer data to calculate the maximum saturation value to represent the color saturation of a frame of image.
  • the color saturation value is selected by the difference between the maximum value and the minimum value, the color saturation is closely related to the hue of the pixel, and the hue and color saturation are both related to the color difference Closely related, by calculating the color saturation value of the entire frame, it can represent the color difference of the entire frame image to a considerable extent, so that the color difference is replaced by the color saturation of the digital data, so that the processor can be based on the color saturation
  • the difference is, look up the required gamma curve value from the lookup table, select the value in the table to drive, thereby reducing the problem of color difference; many times, the amount of data storage uses 8-bit data length, but in fact due to the color saturation A lot of process data is discarded, so it can be compressed and stored in a data length of less than or equal to 6 bits.
  • the gamma adjustment lookup table is based on the color saturation value in advance, and correspondingly set a gamma adjustment value; when Smax is close to 60, the color difference is large, so, The corresponding gamma curve value needs to be adjusted down more, and when it is close to 0 or 120, since the degree of color difference is small, the adjustment of the gamma curve value can be basically not performed or even adjusted.
  • the above-mentioned pixel saturation S is recorded as 6 bits or less.
  • the above process algorithm can effectively adjust the panel characteristics according to the image saturation, so as to achieve the best image quality characteristics of the panel.
  • a display panel which uses the driving method of the display panel as described above.
  • the panel of this application can be a TN panel (full name Twisted Nematic, namely twisted nematic panel), IPS panel (In-Plane Switching, plane switching), VA panel (Multi-domain Vertica Alignment, multi-quadrant vertical alignment technology), Of course, other types of panels can also be used.
  • TN panel full name Twisted Nematic, namely twisted nematic panel
  • IPS panel In-Plane Switching, plane switching
  • VA panel Multi-domain Vertica Alignment, multi-quadrant vertical alignment technology

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Abstract

一种显示面板的驱动方法和显示面板，显示面板的驱动方法包括：输入一帧图像；获取显示器逐行扫描的一帧图像信号；以2的倍数为间隔选取一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值；根据色饱和值判断一帧图像的色差程度；根据一帧图像的色差程度调整伽马曲线值；使用调整后的伽马曲线值驱动显示面板。

Description

显示面板的驱动方法和显示面板
本申请要求于2018年12月11日提交中国专利局，申请号为CN201811510622.3，申请名称为“一种显示面板的驱动方法和显示面板”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示装置领域，尤其涉及一种显示面板的驱动方法和显示面板。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
随着科技的发展和进步，液晶显示器由于具备机身薄、省电和辐射低等热点而成为显示器的主流产品，得到了广泛应用。现有市场上的液晶显示器大部分为背光型液晶显示器，其包括液晶面板及背光模组(backlight module)。液晶面板的工作原理是在两片平行相对的玻璃基板当中放置液晶分子，并在两片玻璃基板上施加驱动电压来控制液晶分子的旋转方向，以将背光模组的光线折射出来产生画面。
其中，薄膜晶体管液晶显示器(Thin Film Transistor-Liquid Crystal Display，TFT-LCD)由于具有低的功耗、优异的画面品质以及较高的生产良率等性能，目前已经逐渐占据了显示领域的主导地位。同样，薄膜晶体管液晶显示器包含液晶面板和背光模组，液晶面板包括彩膜基板(Color Filter Substrate，CF Substrate，也称彩色滤光片基板)、薄膜晶体管阵列基板(Thin Film Transistor Substrate，TFT Substrate)和光罩(Mask)，上述基板的相对内侧存在透明电极。两片基板之间夹一层液晶分子(Liquid Crystal，LC)。
伽马曲线是电视最重要的光电转换曲线，一般而言，电视的伽马曲线值会设计在2.2，才能有效补偿现行的显示系统，让人眼获得最佳的显示效果，然而，由于LCD显示器的非等相性，使得LCD正视角的伽马曲线与侧视角不同，尤其是VA(Multi-domain Vertica Alignment，多象限垂直配向技术)型面板，其侧视角的伽马曲线偏移过大，在一些图像画质表现上，明显不佳，因此一个改善LCD面板的色偏改善技术，对于LCD显示器而言，十分的重要，各种画质的关键技术，无不希望改善此视角特性
技术解决方案
本申请提供一种改善LCD显示器的视觉色差特性的显示面板的驱动方法和显示面板。
为实现上述目的，本申请提供了一种显示面板的驱动方法，所述驱动方法包括步骤：
输入一帧图像；
判断一帧图像的色差程度；
根据一帧图像的色差程度调整伽马曲线值；
使用调整后的伽马曲线值驱动显示面板。
可选的，所述根据一帧图像的色差程度调整面板伽马曲线值的步骤包括：
若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值。
可选的，所述根据一帧图像的色差程度调整面板伽马曲线值的步骤包括：
若一帧图像的色差程度小于预设阈值，则保留原始伽马曲线值。
可选的，所述判断一帧图像的色差程度的步骤包括：
获取显示器逐行扫描的一帧图像信号；
计算一帧图像中每个像素的色饱和程度形成色饱和度值；
每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中；
将所有行的行缓存数据进行逐行累加形成帧缓存数据；
将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度；
将每一帧图像的最大饱和度值用以代表一帧图像进行色差程度判断，色饱和度值越大代表色差程度越大。
可选的，所述计算一帧图像中每个像素的色饱和程度形成色饱和度值的步骤包括：
以2的倍数为间隔选取一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值；
所述色饱和度值的计算公式是：
S＝max(R,G,B)–min(R,G,B)公式，其中，S表示色饱和度值，R表示红色子像素的灰阶，G表示绿色子像素的灰阶，B表示蓝色子像素的灰阶。
可选的，所述每个色饱和度值的数据大小小于或等于6比特。
可选的，以32为间隔一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值。
可选的，所述根据一帧图像的色差程度调整面板伽马曲线值的步骤包括：
根据一帧图像的色饱和度值，从伽马调整查找表找到调整后的伽马曲线值并控制调整面板伽马曲线值。
可选的，所述伽马调整查找表是预先根据色饱和度的不同，分别对应设置有一个伽马调 整值形成的；
其中，当色饱和度值在60时，所述调整后的伽马曲线值和原始伽马曲线值的调低差值最大，而色饱和度值不等于60时，则越远离调整后的伽马曲线值和原始伽马曲线值的调低差值越小；
当色饱和度值在0和120时，所述伽马调整值符合伽马等于2.2。
本申请还提供了一种显示面板的驱动方法，所述方法包括步骤：
输入一帧图像：
获取显示器逐行扫描的一帧图像信号；
以2的倍数为间隔选取一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值；
所述色饱和度值的计算公式是：
S＝max(R,G,B)–min(R,G,B)公式，其中，S表示色饱和度值。
每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中；
将所有行的行缓存数据进行逐行累加形成帧缓存数据；
每个色饱和度值的数据大小小于或等于6比特。
将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度；
将每一帧图像的最大饱和度值用以代表一帧图像进行色差程度判断，色饱和度值越大代表色差程度越大。
若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值。
若一帧图像的色差程度小于预设阈值，则保留原始伽马曲线值。
使用调整后的伽马曲线值驱动显示面板。
本申请的另一目的在于，公开一种显示面板，使用如上所述的显示面板的驱动方法。
伽马曲线值是显示面板驱动的重要参数，该伽玛曲线值对于画面的显示效果有重要的决定性作用，伽马曲线是电视最重要的光电转换曲线，一般而言，电视的伽马曲线会设计在伽马2.2，才能有效补偿现行的显示系统，让人眼获得最佳的显示效果，然而，由于LCD显示器的非等相性，使得LCD正视角的伽马曲线与侧视角不同，尤其是VA型面板，其侧视角的伽马曲线偏移过大(如图1所示)，在一些图像画质表现上，明显不佳。而发明人发现一般而言，伽马曲线值越低，视角色差越小；伽马曲线值越大，视角色差越大，因此，我们设计一影像分析处理方法，针对画面的内容特性，调整伽马曲线值，首先通过输入一帧图像，判断这一帧图像的色差程度，根据色差程度调整伽马曲线值的大小，使用调整后的伽马曲线值来驱动显示面板，如此，便能够在色差较大的时候，对应将其伽玛曲线值调低以达到减少 色差的目的，从而优化画面的显示效果。
附图说明
所包括的附图用来提供对本申请实施例的进一步的理解，其构成了说明书的一部分，用于例示本申请的实施方式，并与文字描述一起来阐释本申请的原理。显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。在附图中：
图1是本申请实施例一种视角与伽马曲线值的示意图；
图2是本申请实施例一种肤色色差的示意图；
图3是本申请实施例一种多区域的画素设计的示意图；
图4是本申请实施例一种伽马曲线值与视觉色差的示意图；
图5是本申请实施例一种动态伽马曲线算法流程的示意图；
图6是本申请实施例一种动态伽马曲线调整方法步骤的示意图。
图7是本申请实施例一种伽马对应Smax值的示意图；
图8是本申请实施例一种显示面板驱动方法步骤的示意图。
具体实施方式
下这里所公开的具体结构和功能细节仅仅是代表性的，并且是用于描述本申请的示例性实施例的目的。但是本申请可以通过许多替换形式来具体实现，并且不应当被解释成仅仅受限于这里所阐述的实施例。
在本申请的描述中，需要理解的是，术语“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。另外，术语“包括”及其任何变形，意图在于覆盖不排他的包含。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申 请中的具体含义。
这里所使用的术语仅仅是为了描述具体实施例而不意图限制示例性实施例。除非上下文明确地另有所指，否则这里所使用的单数形式“一个”、“一项”还意图包括复数。还应当理解的是，这里所使用的术语“包括”和/或“包含”规定所陈述的特征、整数、步骤、操作、单元和/或组件的存在，而不排除存在或添加一个或更多其他特征、整数、步骤、操作、单元、组件和/或其组合。
在图中，结构相似的单元是以相同标号表示。
一种未公开的技术方案如下：
根据图1至图3所示，一种LCD改善视角的方式为设计8畴(domain)的画素设计，使液晶在画素空间上呈现对称设计，来补偿因为视角不同所造成的光相差，如图3所示，然而，使用多区域的画素设计方式，不仅会增加画素设计的难度，画素的走线，包含电极，以及TFT组件等，对于一个画素的开口率而言，都会产生缩小的效果，因此，一个透过图像处理的方法，来提升视角画质的方法，显得相当重要。
下面结合附图和实施例对本申请作进一步说明。
如图1至图7所示，本申请实施例公布了一种显示面板的驱动方法，驱动方法包括步骤：
S81：输入一帧图像；
S82：判断一帧图像的色差程度；
S83：根据一帧图像的色差程度调整伽马曲线值；
S84：使用调整后的伽马曲线值驱动显示面板。
伽马曲线值是显示面板驱动的重要参数，该伽玛曲线值对于画面的显示效果有重要的决定性作用，伽马(Gamma)曲线是电视最重要的光电转换曲线，一般而言，电视的伽马曲线值(gamma curve)会设计在gamma 2.2，才能有效补偿现行的显示系统，让人眼获得最佳的显示效果，然而，由于LCD显示器的非等相性，使得LCD正视角的gamma曲线与侧视角不同，尤其是VA型面板，其侧视角的gamma曲线偏移过大(如图1所示)，在一些图像画质表现上，明显不佳。而发明人发现一般而言，伽马曲线值越低，视角色差越小；伽马曲线值越大，视角色差越大，因此，我们设计一影像分析处理方法，针对画面的内容特性，调整伽马曲线值，首先通过输入一帧图像，判断这一帧图像的色差程度，根据色差程度调整伽马曲线值的大小，使用调整后的伽马曲线值来驱动显示面板，如此，便能够在色差较大的时候，对应将其伽玛曲线值调低以达到减少色差的目的，从而优化画面的显示效果。
在一实施例中，根据一帧图像的色差程度调整面板伽马曲线值得步骤包括：
若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值。
调整伽马曲线值的时候主要参考预设阈值，若一帧图像的色差程度大于或者等于预设阈 值，此时色差影响较大，我们需要调低伽马曲线值，(例如，该色差程度的值等于0，即没有色差的时候，可以不调节伽马曲线值，或者在视角30度下，色差小于0.02的时候，不需要调解；而在超出上述范围时，则色差偏移越大，对应调低伽马曲线值的程度越大，从而减少色差，优化画面的显示效果)。
在一实施例中，根据一帧图像的色差程度调整面板伽马曲线值得步骤包括：
若一帧图像的色差程度小于预设阈值，则保留原始伽马曲线值。
功效分析：伽马曲线值的调整要参考预设阈值，若一帧图像的色差程度小于预设阈值，此时色差影响不大大，我们保持原始伽马曲线值即可；这样子，可以减少调整伽马曲线值的工作量，在减少色差的同时，避免无用功的产生，(例如，色差在视角30度下，色差小于0.02的时候)。
在一实施例中，判断一帧图像的色差程度的步骤：
获取显示器逐行扫描的一帧图像信号；
计算一帧图像中每个像素的色饱和程度形成色饱和度值；
每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中；
将所有行的行缓存数据进行逐行累加形成帧缓存数据；
将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度；
将每一帧图像的最大饱和度值用以代表一帧图像进行色差程度判断，色饱和度值越大代表色差程度越大。
对于每一帧图像的色差程度的判断是本方法重要一步，其判断的依据应该充分，得出的数据应准确，从获取显示器逐行扫描的一帧图像信号开始，计算一帧图像中每个像素的色饱和程度形成色饱和度值，然后每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中，接着将所有行的行缓存数据进行逐行累加形成帧缓存数据，将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度；而一般来说，色饱和度越大，对应的色差程度越大，如此，便可以通过一可见且可以进行处理的色饱和度值，即将每一帧图像的最大饱和度值用以代表一帧图像进行色差程度判断是否需要进行伽马值的调整，使得人眼的色差程度的判断转换为数据，从而实现了对于色差的检测，从而能够根据色差程度的不同，给予不同的伽马曲线值，减少色偏的发生。
在一实施例中，计算一帧图像中每个像素的色饱和程度形成色饱和值的步骤包括：
以2的倍数为间隔选取一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值；
色饱和度值的计算公式是：
S＝max(R,G,B)–min(R,G,B)公式，其中，S表示色饱和度值，R表示红色子像素的色调，G表示绿色子像素的色调，B表示蓝色子像素的色调。
我们在计算色饱和度值的时候，主要采用公式S＝max(R,G,B)–min(R,G,B)进行计算，通过最大值与最小值得差值来选取色饱和度值，色饱和度跟像素的色调紧密相关，而色调和色饱和度均与色差密切相关，通过计算整帧色饱和度值，便能够在相当的程度上代表整帧图像的色差情况，从而将色差用可数据化的色饱和度来代替，从而使得处理器能够根据色饱和度的不同，从查找表中查找需要的伽马曲线值，用于驱动，从而减少色差的情况。
在一实施例中，以32为间隔一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值。
为了降低储存量，选择以32为间隔一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值，符合最经济的成本。
在一实施例中，根据一帧图像的色差程度调整面板伽马曲线值的步骤包括：
根据一帧图像的色饱和度值，从伽马调整查找表找到调整后的伽马曲线值并控制调整面板伽马曲线值。
设置查找表，可以快速确定对应关系，对伽马曲线值的调整快速做出反应，根据一帧图像的色饱和度值，从伽马调整表中找到调整后的伽马曲线值并控制调整面板伽马曲线值。
在一实施例中，伽马调整查找表是预先根据色饱和度的不同，分别对应设置有一个伽马调整值形成的；
其中，当色饱和度值在60时，所述调整后的伽马曲线值和原始伽马曲线值的调低差值最大，而色饱和度值不等于60时，则越远离调整后的伽马曲线值和原始伽马曲线值的调低差值越小；
当色饱和度值在0和120时，所述伽马调整值符合伽马等于2.2，(例如，该附图7显示的，该S＝60时，该伽马曲线值可以取1.85左右)。
作为本申请的另一实施例，参考图1至图7所示，公开了一种显示面板的驱动方法，包括步骤：
输入一帧图像：
获取显示器逐行扫描的一帧图像信号；
以2的倍数为间隔选取一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值；
色饱和度值的计算公式是：
S＝max(R,G,B)–min(R,G,B)公式，其中，S表示色饱和度值，每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中；
将所有行的行缓存数据进行逐行累加形成帧缓存数据；
每个色饱和度值的数据大小小于或等于6比特；
将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度；
将每一帧图像的最大饱和度值用以代表一帧图像进行色差程度判断，色饱和度值越大代表色差程度越大。
若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值。
若一帧图像的色差程度小于预设阈值，则保留原始伽马曲线值。
使用调整后的伽马曲线值驱动显示面板。
对于每一帧图像的色差程度的判断是本方法重要一步，其判断的依据应该充分，得出的数据应准确，从获取显示器逐行扫描的一帧图像信号开始，计算一帧图像中每个像素的色饱和程度形成色饱和度值，然后每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中，接着将所有行的行缓存数据进行逐行累加形成帧缓存数据，将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度，我们在计算色饱和度值的时候，主要采用公式S＝max(R,G,B)–min(R,G,B)进行计算，通过最大值与最小值得差值来选取色饱和度值，色饱和度跟像素的色调紧密相关，而色调和色饱和度均与色差密切相关，通过计算整帧色饱和度值，便能够在相当的程度上代表整帧图像的色差情况，从而将色差用科数据化的色饱和度来代替，从而使得处理器能够根据色饱和度的不同，从查找表中查找需要的伽马曲线值，选择表中的值进行驱动，从而减少色差的问题；很多时候，数据的存储量多用8比特的数据长度，但是实际上由于该色饱和度摒弃了很多过程数据，因而可以将其进行压缩而存储在小于或等于6比特的数据长度中，这样做有效的降低了储存量，避免行缓冲器被占用过多数据，而影响其他数据处理而影响画面显示的问题发生；设置查找表，可以快速确定对应关系，对伽马曲线值的调整快速做出反应，根据一帧图像的色饱和度值，从伽马调整表中找到调整后的伽马曲线值并控制调整面板伽马曲线值；伽马调整查找表是预先根据色饱和度值得不同，分别对应设置一个伽马调整值；在Smax靠近60的时候，色差程度较大，所以，对应的伽马曲线值需要调低较多，而在靠近0或120时，由于色差程度较小，则可以基本不进行伽马曲线值的调节，甚至不调节。
作为本申请的另一实施例，参考图6和图7所示，具体方案实施如下详述：
获取显示器逐行扫描的影像讯号红色(Red)，绿色(Green)，蓝色(Blue)，计算每一个pixel(像素)的饱和程度S＝max(R,G,B)–min(R,G,B)，并分别储存于行缓存器中(line buffer)。
为了降低储存量，将上述pixel饱和度S记录为6bit或是6bit以下。
统计累加上述行缓冲器柱状图(line buffer histogram)；
为了降低行缓冲器(line buffer)储存量，将上述柱状图(histogram)除以2的倍数(如8or 16or 32，此例使用32)，已符合最经济的成本。以1920x1080为例，行缓冲器大小(line buffer size)＝(1920/32)x6bit
将上述line buffer再逐行累加，以1080条line为例，共要累加1080条line buffer。
统计整张帧(frame)的柱状图缓冲器(histogram buffer)数量＝6bitx(1920/32)x1080
将上述histogram每个bit的量，进行两两大小比较，取得histogram的最大饱和度，代表整张影像的饱和度值Smax，Smax越大，表示影像的饱和度越高，反之，Smax越低，影像的饱和度越低。
将上述Smax作为面板gamma设定的参考(如图7)，并利用伽马调整查找表(LUT)记录于时序控制芯片的缓存器，供gamma选择器选取。
上述流程算法，可以有效根据影像饱和度，动态调整面板特性，让面板的画质特性达到最佳。
作为本申请的另一实施例，参考图8所示，公开了一种显示面板，使用如上所述的显示面板的驱动方法。
需要说明的是，本方案中涉及到的各步骤的限定，在不影响具体方案实施的前提下，并不认定为对步骤先后顺序做出限定，写在前面的步骤可以是在先执行的，也可以是在后执行的，甚至也可以是同时执行的，只要能实施本方案，都应当视为属于本申请的保护范围。
本申请的面板可以是TN面板(全称为Twisted Nematic，即扭曲向列型面板)、IPS面板(In-Plane Switching，平面转换)、VA面板(Multi-domain Vertica Alignment，多象限垂直配向技术)，当然，也可以是其他类型的面板，适用即可。
以上内容是结合具体的可选的实施方式对本申请所作的进一步详细说明，不能认定本申请的具体实施只局限于这些说明。对于本申请所属技术领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本申请的保护范围。

Claims (19)

  1. 一种显示面板的驱动方法，所述驱动方法包括步骤：
    输入一帧图像；
    判断一帧图像的色差程度；
    根据一帧图像的色差程度调整伽马曲线值；
    使用调整后的伽马曲线值驱动显示面板。
  2. 如权利要求1所述的一种显示面板的驱动方法，其中，所述根据一帧图像的色差程度调整面板伽马曲线值的步骤包括：
    若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值。
  3. 如权利要求2所述的一种显示面板的驱动方法，其中，所述若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值的步骤包括：
    若一帧图像，在视角30度下，色差大于或等于0.02，则调低伽马曲线值。
  4. 如权利要求2所述的一种显示面板的驱动方法，其中，所述色差程度越大，调低伽马曲线值的程度越大。
  5. 如权利要求1所述的一种显示面板的驱动方法，其中，所述根据一帧图像的色差程度调整面板伽马曲线值的步骤包括：
    若一帧图像的色差程度小于预设阈值，则保留原始伽马曲线值。
  6. 如权利要求1所述的一种显示面板的驱动方法，其中，所述若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值的步骤包括：
    若一帧图像，在视角30度下，色差小于0.02，则保留原始伽马曲线值。
  7. 如权利要求3所述的一种显示面板的驱动方法，其中，所述判断一帧图像的色差程度的步骤包括：
    获取显示器逐行扫描的一帧图像信号；
    计算一帧图像中每个像素的色饱和程度形成色饱和度值；
    每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中；
    将所有行的行缓存数据进行逐行累加形成帧缓存数据；
    将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度；
    将每一帧图像的最大饱和度值用以代表一帧图像进行色差程度判断，色饱和度值越大代表色差程度越大。
  8. 如权利要求7所述的一种显示面板的驱动方法，其中，所述最大色饱和度值划分为 第一区间和第二区间；
    当所述最大色饱和度值位于第一区间时，色饱和度值越大代表色差程度越大，调低伽马曲线值的程度越大；
    当所述最大色饱和度值位于第二区间时，色饱和度值越大代表色差程度越小，调低伽马曲线值的程度越小。
  9. 如权利要求8所述的一种显示面板的驱动方法，其中，所述第一区间的色饱和度值为[0，60)，所述第二区间为[60，120]。
  10. 如权利要求7所述的一种显示面板的驱动方法，其中，所述计算一帧图像中每个像素的色饱和程度形成色饱和度值的步骤包括：
    以2的倍数为间隔选取一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值；
    所述色饱和度值的计算公式是：
    S＝max(R,G,B)–min(R,G,B)公式，其中，S表示色饱和度值，R表示红色子像素的灰阶，G表示绿色子像素的灰阶，B表示蓝色子像素的灰阶。
  11. 如权利要求10所述的一种显示面板的驱动方法，其中，所述每个色饱和度值的数据大小小于或等于6比特。
  12. 如权利要求10所述的一种显示面板的驱动方法，其中，所述根据一帧图像的色差程度调整面板伽马曲线值的步骤包括：
    根据一帧图像的色饱和度值，从伽马调整查找表找到调整后的伽马曲线值并控制调整面板伽马曲线值。
  13. 如权利要求12所述的一种显示面板的驱动方法，其中，所述伽马调整查找表是预先根据色饱和度的不同，分别对应设置有一个伽马调整值形成的；
    其中，当色饱和度值在60时，所述调整后的伽马曲线值和原始伽马曲线值的调低差值最大，而色饱和度值不等于60时，则越远离调整后的伽马曲线值和原始伽马曲线值的调低差值越小。
  14. 如权利要求13所述的一种显示面板的驱动方法，其中，当色饱和度在0和120时，所述伽马调整值符合伽马等于2.2。
  15. 一种显示面板的驱动方法，所述方法包括步骤：
    输入一帧图像：
    获取显示器逐行扫描的一帧图像信号；
    以2的倍数为间隔选取一帧图像中每一行的像素，间隔计算选取出的每个像素的色饱和程度形成色饱和度值；
    所述色饱和度值的计算公式是：
    S＝max(R,G,B)–min(R,G,B)公式，其中，S表示色饱和度值。
    每一行像素分别统计累加色饱和度值形成行缓存数据存储在行缓存器中；
    将所有行的行缓存数据进行逐行累加形成帧缓存数据；
    每个色饱和度值的数据大小小于或等于6比特。
    将帧缓存数据中的所有色饱和度值进行大小比较计算得到最大饱和度值用以代表一帧图像的色饱和程度；
    将每一帧图像的最大饱和度值用以代表一帧图像进行色差程度判断，色饱和度值越大代表色差程度越大。
    若一帧图像的色差程度大于或等于预设阈值，则调低伽马曲线值。
    若一帧图像的色差程度小于预设阈值，则保留原始伽马曲线值。
    使用调整后的伽马曲线值驱动显示面板。
  16. 一种显示面板，使用如下一种显示面板的驱动方法，所述驱动方法包括步骤：
    输入一帧图像；
    判断一帧图像的色差程度；
    根据一帧图像的色差程度调整伽马曲线值；
    使用调整后的伽马曲线值驱动显示面板。
  17. 如权利要求16所述的一种显示面板，其中，所述显示面板包括时序控制芯片缓存器，存储有伽马调整查找表。
  18. 如权利要求16所述的一种显示面板，其中，所述显示面板包括与所述时序控制芯片缓存器耦合的伽马选择器。
  19. 如权利要求17所述的一种显示面板，其中，所述显示面板包括计算得到最大色饱和度值的行缓冲器；
    所述伽马调整查找表是预先根据色饱和度值的不同，分别对应设置一个伽马调整值。
PCT/CN2019/077605 2018-12-11 2019-03-11 显示面板的驱动方法和显示面板 WO2020118927A1 (zh)

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