WO2017008362A1 - 液晶面板的显示改善方法及其设备 - Google Patents

液晶面板的显示改善方法及其设备 Download PDF

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WO2017008362A1
WO2017008362A1 PCT/CN2015/086664 CN2015086664W WO2017008362A1 WO 2017008362 A1 WO2017008362 A1 WO 2017008362A1 CN 2015086664 W CN2015086664 W CN 2015086664W WO 2017008362 A1 WO2017008362 A1 WO 2017008362A1
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value
point
gamma
gamma curve
pixel
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French (fr)
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康志聪
陈黎暄
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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 US14/780,534 priority Critical patent/US9734773B2/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
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G09G2300/0447—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
    • 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 invention generally relates to the field of liquid crystal display technologies, and more particularly to a display improvement method for a liquid crystal panel and a display improvement device for the liquid crystal panel.
  • liquid crystal displays LCDs
  • CTR cathode ray tube
  • CNCA/CTS 0019-2013 CESI specification proposes nine chromaticity viewable standards, and the chromaticity view angle is the horizontal view angle when the color difference at the center of the screen is 0.02.
  • the chromaticity view angle is the horizontal view angle when the color difference at the center of the screen is 0.02.
  • Figure 1 shows the gamma curve of a color sub-pixel acquired in the case of a front view and a squint, respectively.
  • each color sub-pixel red sub-pixel, green sub-pixel, blue sub-pixel, white sub-pixel acquired in the case of squint (ie, viewing the liquid crystal panel at a viewing angle of 60° from the vertical direction of the liquid crystal panel)
  • the gamma curve of the gamma curve has a significant gray-scale inversion phenomenon, and the gamma curve of each color sub-pixel obtained by the front view (the liquid crystal panel is observed at a viewing angle of 0° from the vertical direction of the liquid crystal panel) has a large difference. That is, the color difference is large, resulting in a view angle that is too small.
  • FIG. 2 shows a gamma curve of a color sub-pixel acquired in the case of squint after BH/BL conversion.
  • BH/BL conversion means that on the liquid crystal panel, all blue sub-pixels are divided into blue sub-pixel pairs composed of two blue sub-pixels, and the first blue sub-pixel in each blue sub-pixel pair A higher grayscale value is provided, and the second blue subpixel of each blue subpixel pair is provided with a lower grayscale value.
  • the gray-scale inversion phenomenon of the gamma curve of the color sub-pixels (red sub-pixel, green sub-pixel, and blue sub-pixel) acquired by the BH/BL conversion in the case of squint is greatly reduced.
  • An exemplary embodiment of the present invention provides a display improvement method of a liquid crystal panel and an apparatus thereof to overcome the problem of color shift when a liquid crystal panel is viewed sideways or squinted.
  • a display improvement method of a liquid crystal panel wherein each pixel on the liquid crystal panel includes a plurality of color sub-pixels, wherein the method includes: for the plurality of colors At least one color sub-pixel of the sub-pixel acquires a gamma curve in the case of squint; determining brightness enhancement on the gamma curve according to a tangent slope of a point corresponding to each gray-scale value on the acquired gamma curve a starting point, wherein a grayscale value of the brightness enhancement starting point is j, and a tangent slope of the brightness enhancement starting point is smaller than a grayscale value of the gamma curve (j-1) and (j+1) The tangent slope of the point; the brightness value of the point on the gamma curve whose gray scale value is greater than or equal to the gray level value of the brightness enhancement starting point and smaller than the maximum gray level value.
  • the original luminance value of the point where the grayscale value is k on the gamma curve is Lv(k)
  • the new luminance value Lv(k) of the point is obtained by the following operation. ', where k is an integer greater than or equal to j and less than m, and m is the maximum grayscale value:
  • Lv (m) is the original luminance value of the point where the gray-scale value is m on the gamma curve.
  • the original luminance value of the point where the grayscale value is k on the gamma curve is Lv(k)
  • the new luminance value Lv(k) of the point is obtained by the following operation. ', where k is an integer greater than or equal to j and less than m, and m is the maximum grayscale value:
  • Lv(m) is the original luminance value of the point where the grayscale value is m on the gamma curve
  • ⁇ is the predetermined gamma value
  • Lv(m) is the original luminance value of the point where the gray-scale value is m on the gamma curve
  • gamma(k)' is the gamma of the point where the gray-scale value is k and the luminance value is Lv(k)'
  • the value gamma(k)' satisfies the following condition: gamma(k)' ⁇ gamma(k) and let Lv(k)' ⁇ Lv(m), where gamma(k) is a gray scale on the gamma curve
  • the gamma value of the point of value k, gamma(k) lg(Lv(k) / Lv(m)) / lg(k/m).
  • ⁇ is a value less than 2.2.
  • the squint case is a liquid crystal panel viewed from a viewing angle at a predetermined angle from a vertical direction of the liquid crystal panel.
  • each pixel on the liquid crystal panel includes a blue sub-pixel, on which all blue sub-pixels are divided into blue sub-pixel pairs composed of two blue sub-pixels, and each The first blue sub-pixel of the pair of blue sub-pixels is provided with a higher grayscale value, and the second blue sub-pixel of each pair of blue sub-pixels is provided with a lower grayscale value.
  • a display improvement device for a liquid crystal panel, wherein each pixel on the liquid crystal panel includes a plurality of color sub-pixels, wherein the device includes: gamma curve acquisition a unit, for at least one color sub-pixel of the plurality of color sub-pixels, acquiring a gamma curve in the case of squint; a brightness enhancement starting point determining unit, according to the acquired gamma curve, a point corresponding to each grayscale value a tangent slope, determining a luminance enhancement starting point on the gamma curve, wherein a grayscale value of the luminance enhancement starting point is j, and a tangent slope of the luminance enhancement starting point is smaller than a grayscale value of the gamma curve a tangent slope of points of (j-1) and (j+1), respectively; a brightness value increasing unit that increases a gray level value on the gamma curve that is greater than or equal to a gray level value
  • the luminance value increasing unit obtains the new luminance value Lv(k)' of the point by the following operation, where k is an integer greater than or equal to j and less than m, and m is the maximum grayscale value:
  • Lv (m) is the original luminance value of the point where the gray-scale value is m on the gamma curve.
  • the luminance value increasing unit obtains the new luminance value Lv(k)' of the point by the following operation, where k is an integer greater than or equal to j and less than m, and m is the maximum grayscale value:
  • Lv(m) is the original luminance value of the point where the grayscale value is m on the gamma curve
  • ⁇ is the predetermined gamma value
  • the luminance value increasing unit obtains the new luminance value Lv(k)' of the point by the following operation, where k is an integer greater than or equal to j and less than m, and m is the maximum grayscale value:
  • Lv(m) is the original luminance value of the point where the gray-scale value is m on the gamma curve
  • gamma(k)' is the gamma of the point where the gray-scale value is k and the luminance value is Lv(k)'
  • the value gamma(k)' satisfies the following condition: gamma(k)' ⁇ gamma(k) and let Lv(k)' ⁇ Lv(m), where gamma(k) is a gray scale on the gamma curve
  • the gamma value of the point of value k, gamma(k) lg(Lv(k) / Lv(m)) / lg(k/m).
  • ⁇ is a value less than 2.2.
  • a color shift existing when a liquid crystal panel is viewed sideways or squinted is improved by increasing brightness of at least one color sub-pixel at a high gray level
  • Figure 1 shows a gamma curve of a color sub-pixel acquired in the case of a front view and a squint, respectively;
  • FIG. 3 illustrates a flowchart of a display improvement method of a liquid crystal panel according to an exemplary embodiment of the present invention
  • FIG. 4 illustrates a block diagram of a display improvement device of a liquid crystal panel according to an exemplary embodiment of the present invention.
  • the method can be performed by a liquid crystal display or by a computer program, so that when the program is run, the above method is implemented.
  • FIG. 3 illustrates a flow chart of a display improvement method of a liquid crystal panel according to an exemplary embodiment of the present invention.
  • Each pixel on the liquid crystal panel includes a plurality of color sub-pixels. For example, if the liquid crystal panel is an RGB liquid crystal panel, each pixel on the liquid crystal panel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. If the liquid crystal panel is an RGBW liquid crystal panel, each pixel on the liquid crystal panel includes a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. If the liquid crystal panel is an RGBY liquid crystal panel, each pixel on the liquid crystal panel includes a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel.
  • step S10 a gamma curve in the case of squint is acquired for at least one of the plurality of color sub-pixels.
  • the squint case may be that the liquid crystal panel is viewed at a viewing angle at a predetermined angle from the vertical direction of the liquid crystal panel.
  • the predetermined angle may be any one of 30° to 80°. It should be understood that the predetermined angle is related to the desired viewing angle of the liquid crystal panel, and the larger the viewing angle of the desired liquid crystal panel, the larger the predetermined angle should be.
  • the gamma curve of the color sub-pixel with respect to the grayscale value and the luminance value may be acquired according to the luminance value of the color sub-pixel measured at each gray level measured in the case of squint. It should be understood that it can also The gamma curve of the color sub-pixel in the case of squint is obtained by other means.
  • step S20 determining a brightness enhancement starting point on the gamma curve according to a tangent slope of a point corresponding to each grayscale value on the acquired gamma curve, wherein the gray level value of the brightness enhancement starting point is j,
  • the tangent slope of the luminance enhancement starting point is smaller than the tangent slope of the point where the grayscale values on the gamma curve are (j-1) and (j+1), respectively.
  • the point where the tangent slope becomes larger from the small start can be determined as the brightness. Enhance the starting point.
  • step S30 the brightness value of the point on the gamma curve whose gray level value is greater than or equal to the gray level value of the brightness enhancement starting point and smaller than the maximum gray level value is increased.
  • a brightness enhancement operation is performed on all points of the gamma curve whose gray scale value is greater than or equal to j to reduce or eliminate the gamma curve.
  • Gray-scale inversion phenomenon so that the gamma curve overlaps or has a small difference with the gamma curve in the case of the front view as much as possible, so as to eliminate the phenomenon of color shift and the like existing in the case of strabismus.
  • the brightness value of the point on the gamma curve whose gray level value is greater than or equal to the gray level value of the brightness enhancement starting point and smaller than the maximum gray level value may be increased in various ways.
  • the original luminance value of the point where the grayscale value is k on the gamma curve may be Lv(k), and the new luminance value obtained by increasing the luminance value of the point is Lv(k)', where k is greater than An integer equal to j and smaller than m, m is the maximum gray scale value, and Lv(m) is the original luminance value of the point where the gray scale value is m on the gamma curve.
  • the new luminance value Lv(k)' should not exceed Lv(m).
  • the number of gray levels of the pixels differs depending on the liquid crystal panel.
  • the gray scale number is 256, and the gray scales may be sequentially represented as 0, 1, 2, ..., 255.
  • the minimum grayscale value is 0, and the maximum grayscale value m is 255.
  • the number of gray levels is 1024, and the gray scales can be sequentially expressed as 0, 1, 2, ..., 1023. At this time, the minimum grayscale value is 0, and the maximum grayscale value m is 1023.
  • the new luminance value Lv(k)' of the point can be obtained by the following operation:
  • the new luminance value Lv(k)' of the point can be obtained by the following operation:
  • ⁇ is a predetermined gamma value.
  • ⁇ may be a value less than 2.2, and the specific value of ⁇ may be set according to experience and specific conditions.
  • ⁇ can be 1.8.
  • the new luminance value Lv(k)' of the point can be obtained by the following operation:
  • gamma(k)' is the gamma value of the point where the grayscale value is k and the luminance value is Lv(k)'
  • each pixel on the liquid crystal panel may include a blue sub-pixel on which all blue sub-pixels may be divided into blue sub-pixels composed of two blue sub-pixels Yes, and the first blue sub-pixel of each blue sub-pixel pair is provided with a higher grayscale value, and the second blue sub-pixel of each blue sub-pixel pair is provided with a lower grayscale value.
  • each pixel on the liquid crystal panel includes a plurality of color sub-pixels, according to an exemplary embodiment of the present invention.
  • the liquid crystal panel is an RGB liquid crystal panel
  • each pixel on the liquid crystal panel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
  • the liquid crystal panel is an RGBW liquid crystal panel
  • each pixel on the liquid crystal panel includes a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel.
  • each pixel on the liquid crystal panel includes a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel.
  • the display improvement device of the liquid crystal panel includes a gamma curve acquisition unit 10, a brightness enhancement start point determination unit 20, and a brightness value increase unit 30.
  • These units may be implemented by a general-purpose hardware processor such as a digital signal processor, a field programmable gate array, or a dedicated hardware processor such as a dedicated chip, or may be implemented in a software program entirely by a computer program, for example, Each module in the software installed in the liquid crystal display.
  • the gamma curve acquisition unit 10 is configured to acquire a gamma curve in the case of squint for at least one of the plurality of color sub-pixels.
  • the squint case may be that the liquid crystal panel is viewed at a viewing angle at a predetermined angle from the vertical direction of the liquid crystal panel.
  • the predetermined angle may be any one of 30° to 80°. It should be understood that the predetermined angle is related to the desired viewing angle of the liquid crystal panel, and the larger the viewing angle of the desired liquid crystal panel, the larger the predetermined angle should be.
  • the gamma curve acquisition unit 10 may acquire a gamma curve of the color sub-pixel with respect to the grayscale value and the luminance value according to the luminance value of the color sub-pixel measured at each grayscale in the case of squint. It should be understood that the gamma curve acquisition unit 10 can also acquire the gamma curve of the color sub-pixel in the case of squint by other means.
  • the brightness enhancement starting point determining unit 20 is configured to determine a brightness enhancement starting point on the gamma curve according to a tangent slope of a point corresponding to each gray level value on the acquired gamma curve, wherein the brightness enhancement starting point is a gray level value Is j, and the tangent slope of the luminance enhancement starting point is smaller than the tangent slope of the point where the grayscale values on the gamma curve are (j-1) and (j+1), respectively.
  • the luminance enhancement starting point determining unit 20 can increase the tangent slope from a small start.
  • the point is determined as the brightness enhancement starting point.
  • the luminance value increasing unit 30 is configured to increase a luminance value of a point on the gamma curve whose grayscale value is greater than or equal to a grayscale value of the luminance enhancement starting point and smaller than a maximum grayscale value.
  • the luminance value increasing unit 30 performs a brightness enhancement operation on all points of the gamma curve whose grayscale value is greater than or equal to j to mitigate or eliminate
  • the gray-scale inversion phenomenon of the gamma curve so that the gamma curve overlaps or has a small difference with the gamma curve in the case of the front view as much as possible, so as to eliminate the phenomenon of color shift and the like existing in the case of strabismus.
  • the brightness value increasing unit 30 may increase the brightness value of the point on the gamma curve whose gray level value is greater than or equal to the gray level value of the brightness enhancement starting point and smaller than the maximum gray level value.
  • the original luminance value of the point where the grayscale value is k on the gamma curve may be Lv(k), and the new luminance value obtained by increasing the luminance value of the point is Lv(k)', where k is greater than An integer equal to j and smaller than m, m is the maximum gray scale value, and Lv(m) is the original luminance value of the point where the gray scale value is m on the gamma curve.
  • the new luminance value Lv(k)' should not exceed Lv(m).
  • the number of gray levels of the pixels differs depending on the liquid crystal panel.
  • the gray scale number is 256, and the gray scales may be sequentially represented as 0, 1, 2, ..., 255.
  • the minimum grayscale value is 0, and the maximum grayscale value m is 255.
  • the number of gray levels is 1024, and the gray scales can be sequentially expressed as 0, 1, 2, ..., 1023. At this time, the minimum grayscale value is 0, and the maximum grayscale value m is 1023.
  • the luminance value increasing unit 30 can obtain the new luminance value Lv(k)' of the point by the following operation:
  • the luminance value increasing unit 30 can obtain the new luminance value Lv(k)' of the point by the following operation:
  • ⁇ is a predetermined gamma value.
  • ⁇ may be a value less than 2.2, and the specific value of ⁇ may be set according to experience and specific conditions.
  • ⁇ can be 1.8.
  • the luminance value increasing unit 30 can obtain the new luminance value Lv(k)' of the point by the following operation:
  • gamma(k)' is the gamma value of the point where the grayscale value is k and the luminance value is Lv(k)'
  • each pixel on the liquid crystal panel may include a blue sub-pixel on which all blue sub-pixels may be divided into blue sub-pixels composed of two blue sub-pixels Yes, and the first blue sub-pixel of each blue sub-pixel pair is provided with a higher grayscale value, and the second blue sub-pixel of each blue sub-pixel pair is provided with a lower grayscale value.
  • a display improvement method of a liquid crystal panel and an apparatus thereof according to an exemplary embodiment of the present invention can improve color shift or the like existing when a side view or a squint liquid crystal panel is increased by increasing brightness of at least one color sub-pixel at a high gray level
  • the problem is to effectively increase the view angle and satisfy the user's demand for a larger viewing angle of the liquid crystal display.

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  • Crystallography & Structural Chemistry (AREA)
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Abstract

提供一种液晶面板的显示改善方法及其设备。所述方法包括：针对所述多种彩色子像素中的至少一种彩色子像素，获取在斜视情况下的伽马曲线；根据获取的伽马曲线上对应于各灰阶值的点的切线斜率，确定所述伽马曲线上的亮度增强起点，其中，所述亮度增强起点的灰阶值为j，并且，所述亮度增强起点的切线斜率小于所述伽马曲线上灰阶值分别为(j-1)和(j+1)的点的切线斜率；增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。根据所述方法及其设备，能够有效改善在侧看或斜视液晶面板时存在色偏的问题。

Description

液晶面板的显示改善方法及其设备 技术领域
本发明总体说来涉及液晶显示器技术领域，更具体地讲，涉及一种液晶面板的显示改善方法及一种液晶面板的显示改善设备。
背景技术
近年来，液晶显示器(LCD)以其体积小、重量轻、显示质量高等优点逐渐替代了以往的阴极射线显像管(CRT)显示器。随着液晶显示器的不断应用，用户对液晶显示器的视角的要求也逐渐提高，由此，开发出了可视角度比较大的广视角液晶显示器，例如，VA型LCD等。
《超高清显示认证技术规范》CNCA/CTS 0019-2013CESI规格提出了9个色度可视角的标准，色度可视角即在屏幕中心的色差为0.02时的水平可视角。由于目前在侧看或斜视广视角液晶显示器时还存在色偏等问题，从而导致色度可视角过小，无法满足用户对液晶显示器的较大的视角的需求。
具体说来，图1示出分别在正视情况下和斜视情况下获取的颜色子像素的伽马曲线。如图1所示，在斜视情况下(即与液晶面板的垂直方向呈60°的视角观察液晶面板)获取的各颜色子像素(红色子像素、绿色子像素、蓝色子像素、白色子像素)的伽马曲线存在明显的灰阶反转现象，与在正视情况下(以与液晶面板的垂直方向呈0°的视角观察液晶面板)获取的各颜色子像素的伽马曲线差距较大，即色差较大，从而导致可视角过小。
图2示出经过BH/BL变换后的在斜视情况下获取的颜色子像素的伽马曲线。BH/BL变换即在液晶面板上，全部蓝色子像素被划分为由两个蓝色子像素组成的蓝色子像素对，并且，每个蓝色子像素对中的第一蓝色子像素被提供较高灰阶值，每个蓝色子像素对中的第二蓝色子像素被提供较低灰阶值。如图2所示，经过BH/BL变换后的在斜视情况下获取的颜色子像素(红色子像素、绿色子像素、蓝色子像素)的伽马曲线的灰阶反转现象得到大大减轻，但由于诸如数据测量误差、电路信号控制限制、防止空间的亮度闪烁等实际限制，即使经过BH/BL变换仍存在灰阶反转现象，不能达到与在正视情况下获取的颜色子像素 的伽马曲线相重叠或差距较小。因此，仍存在色差，无法满足用户对较大的可视角的需求。
发明内容
本发明的示例性实施例在于提供一种液晶面板的显示改善方法及其设备，以克服在侧看或斜视液晶面板时存在色偏的问题。
根据本发明的示例性实施例，提供一种液晶面板的显示改善方法，其中，所述液晶面板上的每一像素包括多种彩色子像素，其中，所述方法包括：针对所述多种彩色子像素中的至少一种彩色子像素，获取在斜视情况下的伽马曲线；根据获取的伽马曲线上对应于各灰阶值的点的切线斜率，确定所述伽马曲线上的亮度增强起点，其中，所述亮度增强起点的灰阶值为j，并且，所述亮度增强起点的切线斜率小于所述伽马曲线上灰阶值分别为(j-1)和(j+1)的点的切线斜率；增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。
其中，在增大亮度值的步骤中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
Lv(k)′＝f*Lv(k)，
其中，f∈(1,Lv(m)/Lv(k)]，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值。
其中，在增大亮度值的步骤中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
Lv(k)′＝(k/m)(m*γ/k)*Lv(m)，
其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，γ为预定伽马值。
其中，在增大亮度值的步骤中，设所述伽马曲线上灰阶值为k的点的原亮 度值为Lv(k)，通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
Lv(k)′＝(k/m)gamma(k)′*Lv(m)，
其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，gamma(k)′为灰阶值为k、亮度值为Lv(k)′的点的伽马值，gamma(k)′满足以下条件：gamma(k)′<gamma(k)且令Lv(k)′≤Lv(m)，其中，gamma(k)为在所述伽马曲线上灰阶值为k的点的伽马值，gamma(k)＝lg(Lv(k)/Lv(m))/lg(k/m)。
其中，γ为小于2.2的值。
其中，所述斜视情况为以与液晶面板的垂直方向呈预定角度的视角观察液晶面板。
其中，所述液晶面板上的每一像素包括蓝色子像素，在所述液晶面板上，全部蓝色子像素被划分为由两个蓝色子像素组成的蓝色子像素对，并且，每个蓝色子像素对中的第一蓝色子像素被提供较高灰阶值，每个蓝色子像素对中的第二蓝色子像素被提供较低灰阶值。
根据本发明的另一示例性实施例，提供一种液晶面板的显示改善设备，其中，所述液晶面板上的每一像素包括多种彩色子像素，其中，所述设备包括：伽马曲线获取单元，针对所述多种彩色子像素中的至少一种彩色子像素，获取在斜视情况下的伽马曲线；亮度增强起点确定单元，根据获取的伽马曲线上对应于各灰阶值的点的切线斜率，确定所述伽马曲线上的亮度增强起点，其中，所述亮度增强起点的灰阶值为j，并且，所述亮度增强起点的切线斜率小于所述伽马曲线上灰阶值分别为(j-1)和(j+1)的点的切线斜率；亮度值增大单元，增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。
其中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，亮度值增大单元通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
Lv(k)′＝f*Lv(k)，
其中，f∈(1,Lv(m)/Lv(k)]，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值。
其中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，亮度值增大单元通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
Lv(k)′＝(k/m)(m*γ/k)*Lv(m)，
其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，γ为预定伽马值。
其中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，亮度值增大单元通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
Lv(k)′＝(k/m)gamma(k)′*Lv(m)，
其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，gamma(k)′为灰阶值为k、亮度值为Lv(k)′的点的伽马值，gamma(k)′满足以下条件：gamma(k)′<gamma(k)且令Lv(k)′≤Lv(m)，其中，gamma(k)为在所述伽马曲线上灰阶值为k的点的伽马值，gamma(k)＝lg(Lv(k)/Lv(m))/lg(k/m)。
其中，γ为小于2.2的值。
在根据本发明示例性实施例的液晶面板的显示改善方法及其设备中，通过增大至少一种颜色子像素在高灰阶时的亮度来改善在侧看或斜视液晶面板时存在的色偏等问题，从而有效增大可视角，满足用户对液晶显示器的较大的视角的需求。
将在接下来的描述中部分阐述本发明总体构思另外的方面和/或优点，还有一部分通过描述将是清楚的，或者可以经过本发明总体构思的实施而得知。
附图说明
图1示出分别在正视情况下和斜视情况下获取的颜色子像素的伽马曲线；
图2示出经过BH/BL变换后的在斜视情况下获取的颜色子像素的伽马曲线；
图3示出根据本发明示例性实施例的液晶面板的显示改善方法的流程图；
图4示出根据本发明示例性实施例的液晶面板的显示改善设备的框图。
具体实施方式
现将详细参照本发明的实施例，所述实施例的示例在附图中示出，其中，相同的标号始终指的是相同的部件。以下将通过参照附图来说明所述实施例，以便解释本发明。
以下，将结合图3来描述根据本发明示例性实施例的液晶面板的显示改善方法。所述方法可由液晶显示器来完成，也可通过计算机程序来实现，从而当运行该程序时，实现上述方法。
图3示出根据本发明示例性实施例的液晶面板的显示改善方法的流程图。所述液晶面板上的每一像素包括多种彩色子像素。例如，如果所述液晶面板是RGB液晶面板，则所述液晶面板上的每一像素包括红色子像素、绿色子像素和蓝色子像素。如果所述液晶面板是RGBW液晶面板，则所述液晶面板上的每一像素包括红色子像素、绿色子像素、蓝色子像素和白色子像素。如果所述液晶面板是RGBY液晶面板，则所述液晶面板上的每一像素包括红色子像素、绿色子像素、蓝色子像素和黄色子像素。
参照图3，在步骤S10，针对所述多种彩色子像素中的至少一种彩色子像素，获取在斜视情况下的伽马曲线。
这里，所述斜视情况可为以与液晶面板的垂直方向呈预定角度的视角观察液晶面板。所述预定角度可为30°至80°中任一角度。应该理解，所述预定角度与所需的液晶面板的可视角有关，所需的液晶面板的可视角越大，所述预定角度应越大。
作为示例，可根据在斜视情况下测量得到的彩色子像素在各灰阶时的亮度值，获取所述彩色子像素的关于灰阶值与亮度值的伽马曲线。应该理解，也可 通过其他方式获取在斜视情况下的彩色子像素的伽马曲线。
在步骤S20，根据获取的伽马曲线上对应于各灰阶值的点的切线斜率，确定所述伽马曲线上的亮度增强起点，其中，所述亮度增强起点的灰阶值为j，所述亮度增强起点的切线斜率小于所述伽马曲线上灰阶值分别为(j-1)和(j+1)的点的切线斜率。
换言之，如果随着灰阶值增大，所述伽马曲线上的点的切线斜率由大变小后再由小变大，则可将切线斜率由小开始变大的点确定为所述亮度增强起点。
在步骤S30，增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。
换言之，除所述伽马曲线上灰阶值最大的点之外，对所述伽马曲线上灰阶值大于等于j的所有点均进行亮度增强操作，以减轻或消除所述伽马曲线的灰阶反转现象，从而使所述伽马曲线尽可能与在正视情况下的伽马曲线相重叠或差距较小，以消除在斜视情况下存在的色偏等现象。
应该理解，可通过各种方式来增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。可设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，增大该点的亮度值所获得的新亮度值为Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值。并且，应注意，新亮度值Lv(k)′不应超过Lv(m)。
这里，像素的灰阶数随液晶面板的不同而不同，例如，当液晶面板为8比特液晶面板时，灰阶数为256，灰阶可依次表示为0,1,2……,255。此时，最小灰阶值为0，最大灰阶值m为255。例如，当液晶面板为10比特液晶面板时，灰阶数为1024，灰阶可依次表示为0,1,2……,1023。此时，最小灰阶值为0，最大灰阶值m为1023。
作为第一示例，可通过以下运算来获得该点的新亮度值Lv(k)′：
Lv(k)′＝f*Lv(k)，
其中，f∈(1,Lv(m)/Lv(k)]，可根据经验和具体情况来设置f的具体值。
作为第二示例，可通过以下运算来获得该点的新亮度值Lv(k)′：
Lv(k)′＝(k/m)(m*γ/k)*Lv(m)，
其中，γ为预定伽马值。这里，γ可为小于2.2的值，可根据经验和具体情况设置γ的具体值。优选地，γ可为1.8。
作为第三示例，可通过以下运算来获得该点的新亮度值Lv(k)′：
Lv(k)′＝(k/m)gamma(k)′*Lv(m)，
其中，gamma(k)′为灰阶值为k、亮度值为Lv(k)′的点的伽马值，gamma(k)′满足以下条件：gamma(k)′<gamma(k)且令Lv(k)′≤Lv(m)，其中，gamma(k)为在所述伽马曲线上灰阶值为k的点的伽马值，gamma(k)＝lg(Lv(k)/Lv(m))/lg(k/m)。
此外，作为示例，所述液晶面板上的每一像素可包括蓝色子像素，在所述液晶面板上，全部蓝色子像素可被划分为由两个蓝色子像素组成的蓝色子像素对，并且，每个蓝色子像素对中的第一蓝色子像素被提供较高灰阶值，每个蓝色子像素对中的第二蓝色子像素被提供较低灰阶值。从而可更好地消除在斜视情况下的伽马曲线的灰阶反转现象，降低在斜视情况下的色偏。
图4示出根据本发明示例性实施例的液晶面板的显示改善设备的框图，这里，所述液晶面板上的每一像素包括多种彩色子像素。例如，如果所述液晶面板是RGB液晶面板，则所述液晶面板上的每一像素包括红色子像素、绿色子像素和蓝色子像素。如果所述液晶面板是RGBW液晶面板，则所述液晶面板上的每一像素包括红色子像素、绿色子像素、蓝色子像素和白色子像素。如果所述液晶面板是RGBY液晶面板，则所述液晶面板上的每一像素包括红色子像素、绿色子像素、蓝色子像素和黄色子像素。
如图4所示，根据本发明示例性实施例的液晶面板的显示改善设备包括：伽马曲线获取单元10、亮度增强起点确定单元20和亮度值增大单元30。这些单元可由数字信号处理器、现场可编程门阵列等通用硬件处理器来实现，也可通过专用芯片等专用硬件处理器来实现，还可完全通过计算机程序来以软件方式实现，例如，被实现为安装在液晶显示器中的软件中的各个模块。
具体说来，伽马曲线获取单元10用于针对所述多种彩色子像素中的至少一种彩色子像素，获取在斜视情况下的伽马曲线。
这里，所述斜视情况可为以与液晶面板的垂直方向呈预定角度的视角观察液晶面板。所述预定角度可为30°至80°中任一角度。应该理解，所述预定角度与所需的液晶面板的可视角有关，所需的液晶面板的可视角越大，所述预定角度应越大。
作为示例，伽马曲线获取单元10可根据在斜视情况下测量得到的彩色子像素在各灰阶时的亮度值，获取所述彩色子像素的关于灰阶值与亮度值的伽马曲线。应该理解，伽马曲线获取单元10也可通过其他方式获取在斜视情况下的彩色子像素的伽马曲线。
亮度增强起点确定单元20用于根据获取的伽马曲线上对应于各灰阶值的点的切线斜率，确定所述伽马曲线上的亮度增强起点，其中，所述亮度增强起点的灰阶值为j，并且，所述亮度增强起点的切线斜率小于所述伽马曲线上灰阶值分别为(j-1)和(j+1)的点的切线斜率。
换言之，如果随着灰阶值增大，所述伽马曲线上的点的切线斜率由大变小后再由小变大，则亮度增强起点确定单元20可将切线斜率由小开始变大的点确定为所述亮度增强起点。
亮度值增大单元30用于增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。
换言之，除所述伽马曲线上灰阶值最大的点之外，亮度值增大单元30对所述伽马曲线上灰阶值大于等于j的所有点均进行亮度增强操作，以减轻或消除所述伽马曲线的灰阶反转现象，从而使所述伽马曲线尽可能与在正视情况下的伽马曲线相重叠或差距较小，以消除在斜视情况下存在的色偏等现象。
应该理解，亮度值增大单元30可通过各种方式来增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。可设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，增大该点的亮度值所获得的新亮度值为Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值。并且，应注意，新亮度值Lv(k)′不应超过Lv(m)。
这里，像素的灰阶数随液晶面板的不同而不同，例如，当液晶面板为8比特液晶面板时，灰阶数为256，灰阶可依次表示为0,1,2……,255。此时，最小灰阶值为0，最大灰阶值m为255。例如，当液晶面板为10比特液晶面板时，灰阶数为1024，灰阶可依次表示为0,1,2……,1023。此时，最小灰阶值为0，最大灰阶值m为1023。
作为第一示例，亮度值增大单元30可通过以下运算来获得该点的新亮度值Lv(k)′：
Lv(k)′＝f*Lv(k)，
其中，f∈(1,Lv(m)/Lv(k)]，可根据经验和具体情况来设置f的具体值。
作为第二示例，亮度值增大单元30可通过以下运算来获得该点的新亮度值Lv(k)′：
Lv(k)′＝(k/m)(m*γ/k)*Lv(m)，
其中，γ为预定伽马值。这里，γ可为小于2.2的值，可根据经验和具体情况设置γ的具体值。优选地，γ可为1.8。
作为第三示例，亮度值增大单元30可通过以下运算来获得该点的新亮度值Lv(k)′：
Lv(k)′＝(k/m)gamma(k)′*Lv(m)，
其中，gamma(k)′为灰阶值为k、亮度值为Lv(k)′的点的伽马值，gamma(k)′满足以下条件：gamma(k)′<gamma(k)且令Lv(k)′≤Lv(m)，其中，gamma(k)为在所述伽马曲线上灰阶值为k的点的伽马值，gamma(k)＝lg(Lv(k)/Lv(m))/lg(k/m)。
此外，作为示例，所述液晶面板上的每一像素可包括蓝色子像素，在所述液晶面板上，全部蓝色子像素可被划分为由两个蓝色子像素组成的蓝色子像素对，并且，每个蓝色子像素对中的第一蓝色子像素被提供较高灰阶值，每个蓝色子像素对中的第二蓝色子像素被提供较低灰阶值。从而可更好地消除在斜视 情况下的伽马曲线的灰阶反转现象，降低在斜视情况下的色偏。
根据本发明示例性实施例的液晶面板的显示改善方法及其设备，能够通过增大至少一种颜色子像素在高灰阶时的亮度来改善在侧看或斜视液晶面板时存在的色偏等问题，从而有效增大可视角，满足用户对液晶显示器的较大的视角的需求。
虽然已表示和描述了本发明的一些示例性实施例，但本领域技术人员应该理解，在不脱离由权利要求及其等同物限定其范围的本发明的原理和精神的情况下，可以对这些实施例进行修改。

Claims (14)

  1. 一种液晶面板的显示改善方法，其中，所述液晶面板上的每一像素包括多种彩色子像素，其中，所述方法包括：
    针对所述多种彩色子像素中的至少一种彩色子像素，获取在斜视情况下的伽马曲线；
    根据获取的伽马曲线上对应于各灰阶值的点的切线斜率，确定所述伽马曲线上的亮度增强起点，其中，所述亮度增强起点的灰阶值为j，并且，所述亮度增强起点的切线斜率小于所述伽马曲线上灰阶值分别为(j-1)和(j+1)的点的切线斜率；
    增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。
  2. 根据权利要求1所述的方法，其中，在增大亮度值的步骤中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
    Lv(k)′＝f*Lv(k)，
    其中，f∈(1,Lv(m)/Lv(k)]，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值。
  3. 根据权利要求1所述的方法，其中，在增大亮度值的步骤中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
    Lv(k)′＝(k/m)(m*γ/k)*Lv(m)，
    其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，γ为预定伽马值。
  4. 根据权利要求1所述的方法，其中，在增大亮度值的步骤中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，通过以下运算来获得该点的新亮 度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
    Lv(k)′＝(k/m)gamma(k)′*Lv(m)，
    其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，gamma(k)′为灰阶值为k、亮度值为Lv(k)′的点的伽马值，gamma(k)′满足以下条件：gamma(k)′〈gamma(k)且令Lv(k)′≤Lv(m)，其中，gamma(k)为在所述伽马曲线上灰阶值为k的点的伽马值，gamma(k)＝lg(Lv(k)/Lv(m))/lg(k/m)。
  5. 根据权利要求3所述的方法，其中，γ为小于2.2的值。
  6. 根据权利要求1所述的方法，其中，所述斜视情况为以与液晶面板的垂直方向呈预定角度的视角观察液晶面板。
  7. 根据权利要求1所述的方法，其中，所述液晶面板上的每一像素包括蓝色子像素，在所述液晶面板上，全部蓝色子像素被划分为由两个蓝色子像素组成的蓝色子像素对，并且，每个蓝色子像素对中的第一蓝色子像素被提供较高灰阶值，每个蓝色子像素对中的第二蓝色子像素被提供较低灰阶值。
  8. 一种液晶面板的显示改善设备，其中，所述液晶面板上的每一像素包括多种彩色子像素，其特征在于，所述设备包括：
    伽马曲线获取单元，针对所述多种彩色子像素中的至少一种彩色子像素，获取在斜视情况下的伽马曲线；
    亮度增强起点确定单元，根据获取的伽马曲线上对应于各灰阶值的点的切线斜率，确定所述伽马曲线上的亮度增强起点，其中，所述亮度增强起点的灰阶值为j，并且，所述亮度增强起点的切线斜率小于所述伽马曲线上灰阶值分别为(j-1)和(j+1)的点的切线斜率；
    亮度值增大单元，增大所述伽马曲线上灰阶值大于等于所述亮度增强起点的灰阶值且小于最大灰阶值的点的亮度值。
  9. 根据权利要求8所述的设备，其中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，亮度值增大单元通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
    Lv(k)′＝f*Lv(k)，
    其中，f∈(1,Lv(m)/Lv(k)]，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值。
  10. 根据权利要求8所述的设备，其中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，亮度值增大单元通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
    Lv(k)′＝(k/m)(m*γ/k)*Lv(m)，
    其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，γ为预定伽马值。
  11. 根据权利要求8所述的设备，其中，设所述伽马曲线上灰阶值为k的点的原亮度值为Lv(k)，亮度值增大单元通过以下运算来获得该点的新亮度值Lv(k)′，其中，k为大于等于j且小于m的整数，m为最大灰阶值：
    Lv(k)′＝(k/m)gamma(k)′*Lv(m)，
    其中，Lv(m)为所述伽马曲线上灰阶值为m的点的原亮度值，gamma(k)′为灰阶值为k、亮度值为Lv(k)′的点的伽马值，gamma(k)′满足以下条件：gamma(k)′〈gamma(k)且令Lv(k)′≤Lv(m)，其中，gamma(k)为在所述伽马曲线上灰阶值为k的点的伽马值，gamma(k)＝lg(Lv(k)/Lv(m))/lg(k/m)。
  12. 根据权利要求10所述的设备，其中，γ为小于2.2的值。
  13. 根据权利要求8所述的设备，其中，所述斜视情况为以与液晶面板的垂直方向呈预定角度的视角观察液晶面板。
  14. 根据权利要求8所述的设备，其中，所述液晶面板上的每一像素包括蓝色子像素，在所述液晶面板上，全部蓝色子像素被划分为由两个蓝色子像素组成的蓝色子像素对，并且，每个蓝色子像素对中的第一蓝色子像素被提供较高灰阶值，每个蓝色子像素对中的第二蓝色子像素被提供较低灰阶值。
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