WO2016131216A1 - 校正液晶面板的子像素的成像时灰阶的方法 - Google Patents
校正液晶面板的子像素的成像时灰阶的方法 Download PDFInfo
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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
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- the invention belongs to the technical field of liquid crystal displays, and more particularly to a method for correcting the gray scale of imaging of sub-pixels of a liquid crystal panel.
- liquid crystal displays have gradually replaced conventional cathode ray tube (CRT) displays with their small size, light weight, and high display quality.
- the screen displayed by the liquid crystal panel in the liquid crystal display is composed of a plurality of pixels arranged in an array, and each pixel is usually composed of sub-pixels respectively displaying various colors, and the brightness displayed by each sub-pixel is controlled by the brightness of the backlight module of the liquid crystal display. It is determined together with the gray scale of the sub-pixels of the liquid crystal panel.
- the driving method of the existing liquid crystal display the most common method is to maintain a fixed brightness by using the brightness of the backlight module, and driving each sub-pixel of the liquid crystal panel with different gray scale voltages according to the input image data.
- the liquid crystal is rotated to determine the light transmittance (ie, brightness) of each sub-pixel by the rotation angle of the liquid crystal molecules to achieve gray scale display and development.
- a wide viewing angle liquid crystal display having a relatively large viewing angle has been developed, for example, MVALCD.
- MVALCD a wide viewing angle liquid crystal display
- Such a wide viewing angle liquid crystal display can realize display of a wide viewing angle image by 2D1G technology.
- the sub-pixel 20 is divided into a main sub-pixel region M and a sub-sub-pixel region S.
- the sub-pixel 20 is caused to display a corresponding gray scale by applying a data signal (i.e., a gray scale voltage) to the main sub-pixel region M and the sub-sub-pixel region S of the sub-pixel 20, thereby performing development.
- a data signal i.e., a gray scale voltage
- an exemplary embodiment of the present invention provides a method of correcting an imaging-in-time gray scale of a sub-pixel of a liquid crystal panel capable of reducing image color shift.
- a method of correcting an imaging-in-time gray scale of a sub-pixel of a liquid crystal panel each pixel of the liquid crystal panel including sub-pixels of n colors, wherein n is an integer greater than 0, each sub-pixel includes a main sub-pixel region and a sub-sub-pixel region, the method comprising: a) measuring a gamma curve of an i-th color of n colors of the liquid crystal panel in a front view And obtaining a first brightness value of the sub-pixel of the ith color of the liquid crystal panel at a maximum gray level m, wherein i ⁇ [1, n]; b) passes the first brightness value and a predetermined gamma value Calculating a second brightness value L(j) corresponding to the sub-pixel of the i-th color at each gray level j, where j ⁇ [t, m], t is the minimum gray level; c) obtaining the ith case in the
- the step of determining the total color difference of the gray scale picture displayed by the liquid crystal panel in the case of the front view and the squint when the arbitrary one value combination is applied such that the sub-pixel of the i-th color presents the gray level j includes: f1) respectively acquiring a tristimulus value of the gray scale picture displayed by the liquid crystal panel in the case of the front view and the squint when the one value combination of the i-th color is applied to the gray level j; f2) Calculating the psychological brightness and the psychological chromaticity of the gray scale picture displayed by the liquid crystal panel in the front view based on the tristimulus values in the front view, and calculating the gray scale displayed by the liquid crystal panel based on the tristimulus values in the squint case, respectively.
- step b) includes: calculating, according to the following equation, a second brightness value L corresponding to the sub-pixel of the i-th color at each gray level j by the first brightness value and the predetermined gamma value ):
- ⁇ is a predetermined gamma value
- L(m) is a first luminance value of a sub-pixel of the i-th color at a maximum gray level m.
- step c) includes: closing a sub-sub-pixel region of the sub-pixel of the i-th color; measuring a gamma curve of the ith color of the liquid crystal panel in the case of the front view to obtain a main sub-pixel of the i-th color a third luminance value Lm(r) corresponding to the pixel region at each gray scale r, the step d) includes: turning off the main sub-pixel region of the sub-pixel of the i-th color; and measuring the ith color of the liquid crystal panel in the case of the front view A gamma curve is obtained to obtain a fourth luminance value Ls(s) corresponding to the sub-pixel region of the sub-pixel of the i-th color at each gray scale s.
- the predetermined condition in step e) can be expressed by:
- a method of correcting an imaging-in-time gray scale of a sub-pixel of a liquid crystal panel each pixel of the liquid crystal panel including sub-pixels of n colors, wherein n is An integer greater than 0, each sub-pixel including a main sub-pixel region and a sub-sub-pixel region, the method comprising: a) measuring a gamma curve of an i-th color of n colors of the liquid crystal panel in a front view Acquiring a first brightness value of the sub-pixel of the ith color of the liquid crystal panel at a maximum gray level m, wherein i ⁇ [1, n]; b) is calculated by the first brightness value and a predetermined gamma value a second luminance value L(j) of the sub-pixel of the i-th color at each gray level j, where j ⁇ [t, m], t is the minimum gray scale; c) determining the main sub-pixel of the
- the total color difference in step c) is obtained by: c1) respectively acquiring a tristimulus value of the gray scale picture displayed by the liquid crystal panel in the case of the front view and the squint; c2)
- the stimulus value respectively calculates the psychology of the gray scale image displayed by the liquid crystal panel in the case of the front view Brightness and psychological chromaticity, and based on the tristimulus values in the case of strabismus, respectively calculate the psychological brightness and psychological chromaticity of the grayscale picture displayed by the liquid crystal panel in the case of strabismus; c3) based on the psychological brightness and the case of the front view
- the psychological chromaticity, the psychological brightness and the psychological chromaticity in the case of the strabismus, the total color difference of the gray scale picture displayed by the liquid crystal panel in the case of the front view and the squint is calculated.
- step b) includes: calculating, according to the following equation, a second brightness value L corresponding to the sub-pixel of the i-th color at each gray level j by the first brightness value and the predetermined gamma value ):
- ⁇ is a predetermined gamma value
- L(m) is a first luminance value of a sub-pixel of the i-th color at a maximum gray level m.
- step d) includes: closing a sub-sub-pixel region of the sub-pixel of the i-th color; measuring a gamma curve of the ith color of the liquid crystal panel in the case of the front view to obtain a main sub-pixel of the i-th color a third luminance value corresponding to a grayscale of the main sub-pixel region in each of the determined value combinations, the step e) comprising: turning off the main sub-pixel region of the sub-pixel of the i-th color; measuring the a gamma curve of the i-th color of the liquid crystal panel to obtain a fourth luminance value corresponding to the gray sub-pixel region of the sub-pixel region of the i-th color sub-pixel region in the respective sub-pixel regions in each of the determined value combinations.
- the predetermined condition in step f) is such that
- Lm(x) is a third luminance value corresponding to the grayscale x of the main sub-pixel region in the determined value combination
- Ls(y) is a grayscale y of the second sub-pixel region in the determined value combination.
- the imaging-time gray scale of the sub-pixel can be effectively corrected, thereby reducing the color shift of the liquid crystal panel display image.
- FIG. 1 is a flowchart illustrating a method of correcting an imaging-in-time gray scale of a sub-pixel of a liquid crystal panel, according to an exemplary embodiment of the present invention
- FIG. 2 is a schematic view showing a sub-pixel unit using a 2D1G technology of a conventional liquid crystal panel
- FIG. 3 is a flowchart illustrating another method of correcting an imaging-in-time gray scale of a sub-pixel of a liquid crystal panel, according to an exemplary embodiment of the present invention.
- FIG. 1 is a flowchart illustrating a method of correcting an imaging-in-time gray scale of a sub-pixel of a liquid crystal panel, according to an exemplary embodiment of the present invention.
- the liquid crystal panel includes a plurality of pixels, each of which includes sub-pixels of n colors, and each sub-pixel includes a main sub-pixel region and a sub-sub-pixel region.
- n is an integer greater than 0.
- the liquid crystal panel may be an RGB liquid crystal panel, an RGBY liquid crystal panel, or an RGBW liquid crystal panel or the like.
- n is 3.
- the liquid crystal panel is an RGBY liquid crystal panel or an RGBW liquid crystal panel, n is 4.
- step S101 a gamma curve of an i-th color of n colors of the liquid crystal panel in a front view is measured to obtain a sub-pixel of an ith color of the liquid crystal panel at a maximum gray scale.
- i ⁇ [1,n] The liquid crystal panel is observed as being viewed at a viewing angle of 0 degrees from the vertical direction of the liquid crystal panel.
- the gamma curve is a curve representing the relationship between gray scale and brightness.
- the gamma curve can be measured by various existing methods.
- the order of the gray scale differs depending on the liquid crystal panel.
- the order of the gray scale is 256, and the gray scale can be expressed as 0, 1, 2, ..., 255 in order.
- the maximum gray level m is 255, and the minimum gray level is 0.
- the order of the gray scale is 1024, and the gray scale can be sequentially expressed as 0, 1, 2, ..., 1023.
- the maximum gray level m is 1023, and the minimum gray level is 0.
- step S102 the second brightness corresponding to the sub-pixel of the i-th color at each gray level j is calculated by the first brightness value and the predetermined gamma value of the sub-pixel of the i-th color acquired at step S101 at the maximum gray level m.
- j ⁇ [t, m], t is the minimum gray scale.
- the second brightness value L(j) can be calculated by:
- ⁇ is a predetermined gamma value
- L(m) is a first luminance value of the sub-pixel of the i-th color at the maximum gray level m.
- the predetermined gamma value may be determined according to an optimum display effect of the liquid crystal panel, and preferably, the predetermined gamma value is 2.2.
- the second luminance value L(j) varies with the change of the gray level j.
- step S103 the third luminance value Lm(r) corresponding to each of the gray scales r of the main sub-pixel region of the i-th color sub-pixel in the case of the front view is acquired.
- r ⁇ [t,m].
- the third brightness value Lm(r) can be obtained by various existing methods.
- the step of acquiring the third brightness value Lm(r) comprises:
- the sub-sub-pixel region of the sub-pixel of the i-th color is turned off.
- the sub-sub-pixel region of the sub-pixel of the i-th color can be turned off by various existing methods;
- the gamma curve of the ith color of the liquid crystal panel in the case of the front view is measured to acquire the third luminance value Lm(r) corresponding to the main sub-pixel region of the sub-pixel of the i-th color at each gray scale r.
- the gamma curve can be measured by various existing methods.
- the third luminance value Lm(r) varies with the change of the gray scale r.
- step S104 the fourth luminance value Ls(s) corresponding to the sub-pixel region of the sub-pixel of the i-th color in the case of the respective gray scales s is obtained.
- s ⁇ [t,m].
- the fourth brightness value Ls(s) can be obtained by various existing methods.
- the step of acquiring the fourth brightness value Ls(s) comprises:
- the main sub-pixel region of the sub-pixel of the i-th color is turned off.
- the main sub-pixel region of the sub-pixel of the i-th color can be turned off by various existing methods;
- the gamma curve of the ith color of the liquid crystal panel in the case of the front view is measured to acquire the fourth luminance value Ls(s) corresponding to the sub-pixel region of the sub-pixel of the i-th color at each gray scale s.
- the gamma curve can be measured by various existing methods.
- the fourth luminance value Ls(s) varies with the change of the gray scale s.
- step S105 based on the second brightness value L(j) calculated in step S102, the first third brightness value Lm(r) and the corresponding fourth brightness value Ls(s) satisfying the predetermined condition at the gray level j are determined.
- the predetermined condition can be expressed by the following formula:
- S is a predetermined value.
- the value of S can be set according to the characteristics of the liquid crystal panel.
- step S105 is to find all combinations of values satisfying the gray scale r and the gray scale s of the equation (2) for the gray scale j as the candidate value combinations for causing the sub-pixels of the i-th color to represent the gray scale j.
- step S106 it is determined that when each of the value combinations is applied such that the sub-pixels of the i-th color are presented with the gray level j (ie, the gray scales of the main sub-pixel regions of the sub-pixels of the i-th color and the gray scale of the sub-sub-pixel regions, respectively, are respectively caused.
- the gray scales indicated for each value combination are combined to try to apply different combinations of values to represent the gray scale j) the total color difference of the gray scale picture displayed by the liquid crystal panel in the case of front view and squint.
- the oblique view is regarded as observing the liquid crystal panel at a viewing angle at a predetermined angle from the vertical direction of the liquid crystal panel.
- the predetermined angle may be any angle greater than 0 degrees and less than 90 degrees.
- the predetermined angle is 60 degrees.
- the total color difference can be determined by various methods available.
- the step of determining the total color difference of the grayscale picture displayed by the liquid crystal panel in the case of the front view and the squint when the arbitrary one value combination is applied such that the sub-pixel of the i-th color presents the gray level j comprises:
- the tristimulus values of the grayscale picture displayed by the liquid crystal panel in the case of the front view and the squint when the sub-pixel of the i-th color is presented with the gray level j are respectively acquired.
- the tristimulus value can be obtained by various existing methods for obtaining tristimulus values;
- the psychological brightness and the psychological chromaticity of the gray scale picture displayed by the liquid crystal panel in the front view based on the tristimulus values in the front view, and calculating the display of the liquid crystal panel based on the tristimulus values in the case of squint
- the grayness and psychological color of the grayscale picture in the case of strabismus can be calculated by various existing calculation methods;
- the total color difference of the gray scale picture displayed by the liquid crystal panel in the case of the front view and the squint is calculated.
- the total color difference can be calculated by various existing calculation methods.
- the total color difference can be calculated based on the CIE 1976 color gamut system.
- step of determining the total color difference may determine that each value combination of the gray scale r and the gray scale s determined in step S105 is such that the sub-pixel of the i-th color presents gray scale j when the liquid crystal panel displays The total color difference of the grayscale picture in the case of the front view and the squint case.
- step S107 the value combination corresponding to the smallest total color difference among the total color differences determined in step S106 is determined as the value combination used when the sub-pixel of the i-th color presents the gray level j. That is, the combination of the gray scale of the main sub-pixel region and the gray scale of the sub-sub-pixel region used when the sub-pixel of the i-th color presents the gray scale j is the smallest total color difference in the value combination determined in step S105.
- the combination of the gray scale r and the gray scale s is the combination of the gray scale r and the gray scale s.
- the sub-pixels corresponding to the respective gray levels j of the sub-pixels of the i-th color may be determined by steps S105-S107.
- the combination of the gray scale r of the main sub-pixel region and the gray scale s of the sub-sub-pixel region ie, the gray scale r of the main sub-pixel region and the gray scale s of the sub-sub-pixel region used when the gray scale j is presented) Value combination).
- the respective gray levels j of the sub-pixels respectively corresponding to the respective colors of the liquid crystal panel i.e., the respective values of i are [1, n], respectively
- steps S101-S107 i.e., j is [t, m, respectively.
- Each value of the sub-pixel corresponds to a combination of the gray scale r of the main sub-pixel region of the sub-pixel and the gray scale s of the sub-sub-pixel region.
- FIG. 3 is a flowchart illustrating another method of correcting an imaging-in-time gray scale of a sub-pixel of a liquid crystal panel, according to an exemplary embodiment of the present invention.
- the liquid crystal panel includes a plurality of pixels, each of which includes sub-pixels of n colors, and each sub-pixel includes a main sub-pixel region and a sub-sub-pixel region.
- n is an integer greater than 0.
- the liquid crystal panel may be an RGB liquid crystal panel, an RGBY liquid crystal panel, or an RGBW liquid crystal panel or the like.
- n is 3.
- the liquid crystal panel is an RGBY liquid crystal panel or an RGBW liquid crystal panel, n is 4.
- step S301 the gamma curve of the i-th color of the n colors of the liquid crystal panel in the case of the front view is measured to obtain the sub-pixel of the ith color of the liquid crystal panel at the maximum gray level.
- the first brightness value at m Here, i ⁇ [1,n].
- the liquid crystal panel is observed as being viewed at a viewing angle of 0 degrees from the vertical direction of the liquid crystal panel.
- the gamma curve is a curve representing the relationship between gray scale and brightness.
- the gamma curve can be measured by various methods available.
- the order of the gray scale differs depending on the liquid crystal panel.
- the order of the gray scale is 256, and the gray scale can be expressed as 0, 1, 2, ..., 255 in order.
- the maximum gray level m is 255, and the minimum gray level is 0.
- the order of the gray scale is 1024, and the gray scale can be sequentially expressed as 0, 1, 2, ..., 1023.
- the maximum gray level m is 1023, and the minimum gray level is 0.
- the second brightness corresponding to the sub-pixel of the i-th color at each gray level j is calculated by the first brightness value and the predetermined gamma value of the sub-pixel of the i-th color acquired at step S301 at the maximum gray level m.
- j ⁇ [t, m], t is the minimum gray scale.
- the second brightness value L(j) can be calculated by:
- ⁇ is a predetermined gamma value
- L(m) is a first luminance value of the sub-pixel of the i-th color at the maximum gray level m.
- the predetermined gamma value may be determined according to an optimum display effect of the liquid crystal panel, and preferably, the predetermined gamma value is 2.2.
- the second luminance value L(j) varies with the change of the gray level j.
- step S303 determining a grayscale picture displayed by the liquid crystal panel among the respective value combinations of the gray scale r of the main sub-pixel region of the sub-pixel of the i-th color and the gray scale s of the sub-sub-pixel region in the front view And the combination of values in which the total color difference in the case of squint is less than a predetermined value.
- r ⁇ [t, m]
- s ⁇ [t, m].
- each value combination of the gray scale r of the main sub-pixel region of the sub-pixel of the i-th color and the gray scale s of the sub-sub-pixel region may be expressed as ⁇ (r, s)
- the oblique view is regarded as observing the liquid crystal panel at a viewing angle at a predetermined angle from the vertical direction of the liquid crystal panel.
- the predetermined angle may be any angle greater than 0 degrees and less than 90 degrees.
- the predetermined angle is 60 degrees.
- the predetermined value can be set according to the characteristics of the liquid crystal panel.
- step S303 a grayscale image displayed by the liquid crystal panel when the respective values of the grayscale r of the main sub-pixel region of the sub-pixel of the i-th color and the grayscale s of the sub-sub-pixel region are combined may be obtained.
- the combination of values corresponding to the total color difference smaller than the predetermined value among the respective total color differences is determined.
- the total color difference can be obtained by various existing methods.
- any one of the gray scale r of the main sub-pixel region of the sub-pixel of the i-th color and the gray scale s of the sub-sub-pixel region is obtained.
- the steps of the total color difference when combined include:
- the tristimulus values of the gray scale picture displayed by the liquid crystal panel in the case of the front view and the squint when the arbitrary one of the value combinations are respectively acquired are acquired.
- the tristimulus value can be obtained by various existing methods for obtaining tristimulus values;
- the psychological brightness and the psychological chromaticity of the gray scale picture displayed by the liquid crystal panel in the front view based on the tristimulus values in the front view, and calculating the display of the liquid crystal panel based on the tristimulus values in the case of squint
- the grayness and psychological color of the grayscale picture in the case of strabismus can be calculated by various existing calculation methods;
- the total color difference of the gray scale picture displayed by the liquid crystal panel in the case of the front view and the squint is calculated.
- the total color difference can be calculated by various existing calculation methods.
- the total color difference can be calculated based on the CIE 1976 color gamut system.
- the total color difference when the respective values of the gray scale r of the main sub-pixel region of the sub-pixel of the i-th color and the gray scale s of the sub-sub-pixel region are combined may be obtained.
- each total color difference is compared with a predetermined value to determine a value combination corresponding to the total color difference smaller than the predetermined value.
- step S304 the third luminance value corresponding to the gray scale of the main sub-pixel region in each of the determined value combinations is obtained in the main sub-pixel region of the sub-pixel of the i-th color in the case of the front view.
- the third brightness value can be obtained by various existing methods.
- the step of acquiring the third brightness value comprises:
- the sub-sub-pixel region of the sub-pixel of the i-th color is turned off.
- the sub-sub-pixel region of the sub-pixel of the i-th color can be turned off by various existing methods;
- the gamma curve of the ith color of the liquid crystal panel in the case of the front view is measured to acquire the main sub-pixel region of the sub-pixel of the i-th color corresponding to the gray scale of the main sub-pixel region in each of the determined value combinations.
- the gamma can be measured by various existing methods. line.
- step S305 the fourth brightness value corresponding to the sub-subpixel region of the sub-pixel of the i-th color in the case of the gray-scale of the sub-sub-pixel region in each of the determined value combinations is obtained.
- the fourth brightness value can be obtained by various existing methods.
- the step of acquiring the fourth brightness value comprises:
- the main sub-pixel region of the sub-pixel of the i-th color is turned off.
- the main sub-pixel region of the sub-pixel of the i-th color can be turned off by various existing methods;
- the gamma curve of the ith color of the liquid crystal panel in the case of the front view is measured to acquire the gray scale of the sub-sub-pixel region of the sub-pixel of the i-th color in the sub-sub-pixel region in each of the determined value combinations The corresponding fourth brightness value.
- the gamma curve can be measured by various existing methods.
- step S306 a value combination that satisfies a predetermined condition when the corresponding third brightness value and the corresponding fourth brightness value are satisfied in the gray level j is obtained from the determined value combination based on the second brightness value L(j).
- the predetermined condition is such that
- Lm(x) is a third luminance value corresponding to the grayscale x of the main sub-pixel region in the determined value combination
- Ls(y) is the grayscale y of the sub-subpixel region in the determined value combination.
- step S306 is to find a value combination that minimizes [Lm(x) + Ls(y) - L(j)] / L(j) in the determined value combination for the gray level j.
- step S307 the value combination obtained in step S306 is determined as the value combination used when the sub-pixel of the i-th color presents the gray level j.
- the sub-pixels corresponding to the respective gray scales j of the sub-pixels of the i-th color may be determined by steps S306-S307.
- the combination of the gray scale r of the main sub-pixel region and the gray scale s of the sub-sub-pixel region ie, the gray scale r of the main sub-pixel region and the gray scale s of the sub-sub-pixel region used when the gray scale j is presented) Value combination).
- Steps S301-S307 can determine respective gray scales j of sub-pixels respectively corresponding to respective colors of the liquid crystal panel (i.e., respective values of i are [1, n], respectively) (i.e., each of j is [t, m] respectively
- the value is a combination of the gray scale r of the main sub-pixel region of the sub-pixel and the gray scale s of the sub-sub-pixel region.
- the method of correcting the imaging-in-time gray scale of the sub-pixels of the liquid crystal panel according to an exemplary embodiment of the present invention, it is possible to effectively correct the imaging-time gray scale of the sub-pixel, thereby reducing the color shift of the liquid crystal panel display image.
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Abstract
一种校正液晶面板的子像素的成像时灰阶的方法，包括：获取液晶面板的第i颜色的子像素在最大灰阶时的第一亮度值；计算所述子像素在各个灰阶j时的第二亮度值；获取正视情况下所述子像素的主子像素区域在各个灰阶r时的第三亮度值；获取正视情况下所述子像素的次子像素区域在各个灰阶s时的第四亮度值；确定在灰阶j时满足预定条件的所述子像素的主子像素区域的灰阶和次子像素区域的灰阶的取值组合；确定在应用每个取值组合使得所述子像素呈现灰阶j时液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差；将最小的总色差所对应的取值组合确定为所述子像素呈现灰阶j时使用的取值组合，该方法能够降低液晶面板显示图像的色偏。
Description
本发明属于液晶显示器技术领域，更具体地说，涉及一种校正液晶面板的子像素的成像时灰阶的方法。
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。液晶显示器中的液晶面板所显示的画面由许多阵列排列的像素构成，每一个像素通常由分别显示各种颜色的子像素组成，每一个子像素所显示的亮度由液晶显示器的背光模组的亮度和该液晶面板的子像素的灰阶共同决定。现有的液晶显示器的驱动方法中，最常用的方法是利用背光模组的亮度维持一固定亮度，根据输入的影像资料，分别以不同大小的灰阶电压驱动该液晶面板的每一个子像素内的液晶进行旋转，从而通过液晶分子的旋转角度来决定各个子像素的透光率(即，亮度)，以达到灰阶显示和显像的目的。
随着液晶显示器的不断应用，人们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，MVALCD等。这种广视角液晶显示器可通过2D1G技术来实现广视角图像的显示。采用2D1G技术的液晶面板中，如图2所示，将子像素20分为主子像素区域M和次子像素区域S。通过向子像素20的主子像素区域M和次子像素区域S施加数据信号(即，灰阶电压)来使子像素20显示相应的灰阶，进而进行显像。但是，广视角液晶显示器所显示的广视角图像却存在色偏的问题。
发明内容
为克服现有技术的不足，本发明的示例性实施例提供一种能够降低显示图像色偏的校正液晶面板的子像素的成像时灰阶的方法。
根据本发明的示例性实施例的一方面，提供一种校正液晶面板的子像素的成像时灰阶的方法，所述液晶面板的每一像素包括n个颜色的子像素，其中，
n为大于0的整数，每一子像素包括主子像素区域和次子像素区域，所述方法包括：a)测量正视情况下的所述液晶面板的n个颜色中的第i颜色的伽马曲线，以获取所述液晶面板的第i颜色的子像素在最大灰阶m时的第一亮度值，其中，i∈[1，n]；b)通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)，其中，j∈[t，m]，t为最小灰阶；c)获取正视情况下的第i颜色的子像素的主子像素区域在各个灰阶r时对应的第三亮度值Lm(r)，其中，r∈[t，m]；d)获取正视情况下的第i颜色的子像素的次子像素区域在各个灰阶s时对应的第四亮度值Ls(s)，其中，s∈[t，m]；e)基于第二亮度值L(j)确定在灰阶j时使对应的第三亮度值Lm(r)和对应的第四亮度值Ls(s)满足预定条件的第i颜色的子像素的主子像素区域的灰阶和次子像素区域的灰阶的取值组合；f)确定在应用每个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差；g)将最小的总色差所对应的取值组合确定为第i颜色的子像素呈现灰阶j时使用的取值组合。
可选地，步骤f)中确定在应用任意一个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差的步骤包括：f1)分别获取在应用所述一个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的三刺激值；f2)基于正视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在正视情况下的心理明度和心理色度，并基于斜视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在斜视情况下的心理明度和心理色度；f3)基于所述正视情况下的心理明度和心理色度、所述斜视情况下的心理明度和心理色度，计算所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。
可选地，步骤b)包括：基于下面的等式，通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)：
L(j)＝L(m)×(j/m)γ
其中，γ为预定伽马值，L(m)为第i颜色的子像素在最大灰阶m时的第一亮度值。
可选地，步骤c)包括：关闭第i颜色的子像素的次子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的主子像素区域在各个灰阶r时对应的第三亮度值Lm(r)，步骤d)包括：关闭第i颜色的子像素的主子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的次子像素区域在各个灰阶s时对应的第四亮度值Ls(s)。
可选地，步骤e)中预定条件可通过下式表示：
[Lm(r)+Ls(s)-L(j)]/L(j)<S
其中，S为预定值。
根据本发明的示例性实施例的另一方面，提供一种校正液晶面板的子像素的成像时灰阶的方法，所述液晶面板的每一像素包括n个颜色的子像素，其中，n为大于0的整数，每一子像素包括主子像素区域和次子像素区域，所述方法包括：a)测量正视情况下的所述液晶面板的n个颜色中的第i颜色的伽马曲线，以获取所述液晶面板的第i颜色的子像素在最大灰阶m时的第一亮度值，其中，i∈[1，n]；b)通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)，其中，j∈[t，m]，t为最小灰阶；c)确定第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的各个取值组合之中的使所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差小于预定值的取值组合，其中，r∈[t，m]，s∈[t，m]；d)获取正视情况下的第i颜色的子像素的主子像素区域在处于各个确定的取值组合中的主子像素区域的灰阶时对应的第三亮度值；e)获取正视情况下的第i颜色的子像素的次子像素区域在处于各个确定的取值组合中的次子像素区域的灰阶时对应的第四亮度值；f)基于第二亮度值L(j)从确定的取值组合之中获取在灰阶j时使对应的第三亮度值和对应的第四亮度值满足预定条件的取值组合；g)将获取的取值组合确定为第i颜色的子像素呈现灰阶j时使用的取值组合。
可选地，步骤c)中的总色差通过如下步骤获得：c1)分别获取所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的三刺激值；c2)基于正视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在正视情况下的心理
明度和心理色度，并基于斜视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在斜视情况下的心理明度和心理色度；c3)基于所述正视情况下的心理明度和心理色度、所述斜视情况下的心理明度和心理色度，计算所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。
可选地，步骤b)包括：基于下面的等式，通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)：
L(j)＝L(m)×(j/m)γ
其中，γ为预定伽马值，L(m)为第i颜色的子像素在最大灰阶m时的第一亮度值。
可选地，步骤d)包括：关闭第i颜色的子像素的次子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的主子像素区域在处于各个确定的取值组合中的主子像素区域的灰阶时对应的第三亮度值，步骤e)包括：关闭第i颜色的子像素的主子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的次子像素区域在处于各个确定的取值组合中的次子像素区域的灰阶时对应的第四亮度值。
可选地，步骤f)中的预定条件为使得
[Lm(x)+Ls(y)-L(j)]/L(j)最小，
其中，Lm(x)为确定的取值组合中的主子像素区域的灰阶x所对应的第三亮度值，Ls(y)为确定的取值组合中的次子像素区域的灰阶y所对应的第四亮度值。
根据本发明的示例性实施例提供的校正液晶面板的子像素的成像时灰阶的方法，能够有效地校正子像素的成像时灰阶，从而降低液晶面板显示图像的色偏。
将在接下来的描述中部分阐述本发明另外的方面和/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的实施而得知。
通过下面结合附图进行的对实施例的描述，本发明的上述和/或其它目的和优点将会变得更加清楚，其中：
图1是示出根据本发明示例性实施例的一种校正液晶面板的子像素的成像时灰阶的方法的流程图；
图2是示出现有的液晶面板的采用2D1G技术的子像素单元的示意图；
图3是示出根据本发明示例性实施例的另一种校正液晶面板的子像素的成像时灰阶的方法的流程图。
现将详细描述本发明的示例性实施例，所述实施例的示例在附图中示出，其中，相同的标号指示相同的部分。以下将通过参照附图来说明所述实施例，以便解释本发明。
图1是示出根据本发明示例性实施例的一种校正液晶面板的子像素的成像时灰阶的方法的流程图。所述液晶面板包括多个像素，每一像素包括n个颜色的子像素，每一子像素包括主子像素区域和次子像素区域。这里，n为大于0的整数。作为示例，所述液晶面板可以为RGB液晶面板、RGBY液晶面板或RGBW液晶面板等。当所述液晶面板为RGB液晶面板时，n为3。当所述液晶面板为RGBY液晶面板或RGBW液晶面板时，n为4。
如图1所示，在步骤S101，测量正视情况下的所述液晶面板的n个颜色中的第i颜色的伽马曲线，以获取所述液晶面板的第i颜色的子像素在最大灰阶m时的第一亮度值。这里，i∈[1，n]。所述正视为以与液晶面板的垂直方向呈0度的视角观察液晶面板。所述伽马曲线为表示灰阶与亮度关系的曲线。这里，可通过现有的各种方法来测量所述伽马曲线。
灰阶的阶数由液晶面板的不同而不同，当液晶面板为8比特液晶面板时，灰阶的阶数为256，灰阶可依次表示为0,1,2……,255。此时，最大灰阶m为255，最小灰阶为0。当液晶面板为10比特液晶面板时，灰阶的阶数为1024，灰阶可依次表示为0,1,2……,1023。此时，最大灰阶m为1023，最小灰阶为0。
在步骤S102，通过步骤S101获取的第i颜色的子像素在最大灰阶m时的第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)。这里，j∈[t，m]，t为最小灰阶。作为示例，可通过下式计算所述第二亮度值L(j)：
L(j)＝L(m)×(j/m)γ (1)
这里，γ为预定伽马值，L(m)为第i颜色的子像素在最大灰阶m时的第一亮度值。预定伽马值可根据液晶面板的最佳显示效果来确定，优选地，预定伽马值为2.2。第二亮度值L(j)随灰阶j的变化而变化。
在步骤S103，获取正视情况下的第i颜色的子像素的主子像素区域在各个灰阶r时对应的第三亮度值Lm(r)。这里，r∈[t，m]。可通过现有的各种方法来获取所述第三亮度值Lm(r)。优选地，获取所述第三亮度值Lm(r)的步骤包括：
首先，关闭第i颜色的子像素的次子像素区域。这里，可通过现有的各种方法来关闭第i颜色的子像素的次子像素区域；
然后，测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的主子像素区域在各个灰阶r时对应的第三亮度值Lm(r)。这里，可通过现有的各种方法来测量所述伽马曲线。第三亮度值Lm(r)随灰阶r的变化而变化。
在步骤S104，获取正视情况下的第i颜色的子像素的次子像素区域在各个灰阶s时对应的第四亮度值Ls(s)。这里，s∈[t，m]。可通过现有的各种方法来获取所述第四亮度值Ls(s)。优选地，获取所述第四亮度值Ls(s)的步骤包括：
首先，关闭第i颜色的子像素的主子像素区域。这里，可通过现有的各种方法来关闭第i颜色的子像素的主子像素区域；
然后，测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的次子像素区域在各个灰阶s时对应的第四亮度值Ls(s)。这里，可通过现有的各种方法来测量所述伽马曲线。第四亮度值Ls(s)随灰阶s的变化而变化。
在步骤S105，基于步骤S102计算的第二亮度值L(j)确定在灰阶j时使对应的第三亮度值Lm(r)和对应的第四亮度值Ls(s)满足预定条件的第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的取值组合。这里，预定条件可通过下式表示：
[Lm(r)+Ls(s)-L(j)]/L(j)<S (2)
这里，S为预定值。可根据液晶面板的特性来设定S的值。
换言之，步骤S105是针对灰阶j要找到满足式(2)的灰阶r和灰阶s的所有取值组合，来作为使得第i颜色的子像素呈现灰阶j的候选取值组合。
在步骤S106，确定在应用每个取值组合使得第i颜色的子像素呈现灰阶j时(即，分别使得第i颜色的子像素的主子像素区域的灰阶和次子像素区域的灰阶为各个取值组合所指示的灰阶，以尝试应用不同的取值组合来呈现灰阶j)所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。所述斜视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。所述预定角度可以为大于0度小于90度的任意角度。这里，优选地，所述预定角度为60度。
可通过现有的各种方法来确定所述总色差。优选地，确定在应用任意一个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差的步骤包括：
首先，分别获取在应用所述一个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的三刺激值。所述三刺激值可通过现有的各种获得三刺激值的方法来获得；
其次，基于正视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在正视情况下的心理明度和心理色度，并基于斜视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在斜视情况下的心理明度和心理色度。这里，心理明度和心理色度可通过现有的各种计算方法来计算；
然后，基于所述正视情况下的心理明度和心理色度、所述斜视情况下的心理明度和心理色度，计算所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。这里，可通过现有的各种计算方法来计算总色差。
作为示例，所述总色差可以基于CIE1976色域系统进行计算。
可以理解，根据上述确定所述总色差的步骤可确定在步骤S105所确定的灰阶r和灰阶s的每个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。
在步骤S107，将步骤S106所确定的总色差中最小的总色差所对应的取值组合确定为第i颜色的子像素呈现灰阶j时使用的取值组合。即，第i颜色的子像素呈现灰阶j时使用的主子像素区域的灰阶和次子像素区域的灰阶的取值组合为在步骤S105所确定的取值组合中使所述总色差最小的灰阶r和灰阶s的取值组合。
在本发明示例性实施例中，通过步骤S105-S107可确定分别与第i颜色的子像素的各个灰阶j(即，j分别为[t，m]的各个值)对应的所述子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的取值组合(即，在呈现灰阶j时使用的主子像素区域的灰阶r和次子像素区域的灰阶s的取值组合)。由此，通过步骤S101-S107可确定分别与液晶面板的各个颜色(即，i分别为[1，n]的各个值)的子像素的各个灰阶j(即，j分别为[t，m]的各个值)对应的所述子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的取值组合。
可以理解，图1所示的一种校正液晶面板的子像素的成像时灰阶的方法中的各步骤的执行顺序并不限于此，还可以根据情况进行相应调整。
图3是示出根据本发明示例性实施例的另一种校正液晶面板的子像素的成像时灰阶的方法的流程图。所述液晶面板包括多个像素，每一像素包括n个颜色的子像素，每一子像素包括主子像素区域和次子像素区域。这里，n为大于0的整数。作为示例，所述液晶面板可以为RGB液晶面板、RGBY液晶面板或RGBW液晶面板等。当所述液晶面板为RGB液晶面板时，n为3。当所述液晶面板为RGBY液晶面板或RGBW液晶面板时，n为4。
如图3所示，在步骤S301，测量正视情况下的所述液晶面板的n个颜色中的第i颜色的伽马曲线，以获取所述液晶面板的第i颜色的子像素在最大灰阶m时的第一亮度值。这里，i∈[1，n]。所述正视为以与液晶面板的垂直方向呈0度的视角观察液晶面板。所述伽马曲线为表示灰阶与亮度关系的曲线。这里，
可通过现有的各种方法来测量所述伽马曲线。
灰阶的阶数由液晶面板的不同而不同，当液晶面板为8比特液晶面板时，灰阶的阶数为256，灰阶可依次表示为0,1,2……,255。此时，最大灰阶m为255，最小灰阶为0。当液晶面板为10比特液晶面板时，灰阶的阶数为1024，灰阶可依次表示为0,1,2……,1023。此时，最大灰阶m为1023，最小灰阶为0。
在步骤S302，通过步骤S301获取的第i颜色的子像素在最大灰阶m时的第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)。这里，j∈[t，m]，t为最小灰阶。作为示例，可通过下式计算所述第二亮度值L(j)：
L(j)＝L(m)×(j/m)γ (3)
这里，γ为预定伽马值，L(m)为第i颜色的子像素在最大灰阶m时的第一亮度值。预定伽马值可根据液晶面板的最佳显示效果来确定，优选地，预定伽马值为2.2。第二亮度值L(j)随灰阶j的变化而变化。
在步骤S303，确定第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的各个取值组合之中的使所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差小于预定值的取值组合。这里，r∈[t，m]，s∈[t，m]。作为示例，第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的各个取值组合可表示为{(r，s)|r∈[t，m]，s∈[t，m]}。所述斜视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。所述预定角度可以为大于0度小于90度的任意角度。这里，优选地，所述预定角度为60度。可根据液晶面板的特性来设定预定值。
具体说来，在步骤S303可先获得在第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的各个取值组合时的所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差，然后确定各个总色差中小于预定值的总色差所对应的取值组合。
这里，可通过现有的各种方法来获得所述总色差。优选地，获得在第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的任意一个取值
组合时的所述总色差的步骤包括：
首先，分别获取在所述任意一个取值组合时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的三刺激值。所述三刺激值可通过现有的各种获得三刺激值的方法来获得；
其次，基于正视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在正视情况下的心理明度和心理色度，并基于斜视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在斜视情况下的心理明度和心理色度。这里，心理明度和心理色度可通过现有的各种计算方法来计算；
然后，基于所述正视情况下的心理明度和心理色度、所述斜视情况下的心理明度和心理色度，计算所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。这里，可通过现有的各种计算方法来计算总色差。
作为示例，所述总色差可以基于CIE1976色域系统进行计算。
可以理解，根据上述获得所述总色差的步骤可以得到在第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的各个取值组合时的所述总色差。
在得到各个总色差后，将各个总色差与预定值比较，确定小于预定值的总色差所对应的取值组合。
在步骤S304，获取正视情况下的第i颜色的子像素的主子像素区域在处于各个确定的取值组合中的主子像素区域的灰阶时对应的第三亮度值。可通过现有的各种方法来获取所述第三亮度值。优选地，获取所述第三亮度值的步骤包括：
首先，关闭第i颜色的子像素的次子像素区域。这里，可通过现有的各种方法来关闭第i颜色的子像素的次子像素区域；
然后，测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的主子像素区域在处于各个确定的取值组合中的主子像素区域的灰阶时对应的第三亮度值。这里，可通过现有的各种方法来测量所述伽马曲
线。
在步骤S305，获取正视情况下的第i颜色的子像素的次子像素区域在处于各个确定的取值组合中的次子像素区域的灰阶时对应的第四亮度值。可通过现有的各种方法来获取所述第四亮度值。优选地，获取所述第四亮度值的步骤包括：
首先，关闭第i颜色的子像素的主子像素区域。这里，可通过现有的各种方法来关闭第i颜色的子像素的主子像素区域；
然后，测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的次子像素区域在处于各个确定的取值组合中的次子像素区域的灰阶时对应的第四亮度值。这里，可通过现有的各种方法来测量所述伽马曲线。
在步骤S306，基于第二亮度值L(j)从确定的取值组合之中获取在灰阶j时使对应的第三亮度值和对应的第四亮度值满足预定条件的取值组合。这里，预定条件为使得
[Lm(x)+Ls(y)-L(j)]/L(j)最小
这里，Lm(x)为确定的取值组合中的主子像素区域的灰阶x所对应的第三亮度值，Ls(y)为确定的取值组合中的次子像素区域的灰阶y所对应的第四亮度值。
换言之，步骤S306是要针对灰阶j在确定的取值组合中找到使[Lm(x)+Ls(y)-L(j)]/L(j)最小的取值组合。
在步骤S307，将步骤S306获取的取值组合确定为第i颜色的子像素呈现灰阶j时使用的取值组合。
在本发明示例性实施例中，通过步骤S306-S307可确定分别与第i颜色的子像素的各个灰阶j(即，j分别为[t，m]的各个值)对应的所述子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的取值组合(即，在呈现灰阶j时使用的主子像素区域的灰阶r和次子像素区域的灰阶s的取值组合)。由此，通
过步骤S301-S307可确定分别与液晶面板的各个颜色(即，i分别为[1，n]的各个值)的子像素的各个灰阶j(即，j分别为[t，m]的各个值)对应的所述子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的取值组合。
可以理解，图3所示的另一种校正液晶面板的子像素的成像时灰阶的方法中的各步骤的执行顺序并不限于此，还可以根据情况进行相应调整。
根据本发明的示例性实施例的校正液晶面板的子像素的成像时灰阶的方法，能够有效地校正子像素的成像时灰阶，从而降低液晶面板显示图像的色偏。
本发明的以上实施例仅仅是示例性的，而本发明并不受限于此。本领域技术人员应该理解：在不脱离本发明的原理和精神的情况下，可对这些实施例进行改变，其中，本发明的范围在权利要求及其等同物中限定。
Claims (10)
- 一种校正液晶面板的子像素的成像时灰阶的方法，所述液晶面板的每一像素包括n个颜色的子像素，其中，n为大于0的整数，每一子像素包括主子像素区域和次子像素区域，其中，所述方法包括：a)测量正视情况下的所述液晶面板的n个颜色中的第i颜色的伽马曲线，以获取所述液晶面板的第i颜色的子像素在最大灰阶m时的第一亮度值，其中，i∈[1，n]；b)通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)，其中，j∈[t，m]，t为最小灰阶；c)获取正视情况下的第i颜色的子像素的主子像素区域在各个灰阶r时对应的第三亮度值Lm(r)，其中，r∈[t，m]；d)获取正视情况下的第i颜色的子像素的次子像素区域在各个灰阶s时对应的第四亮度值Ls(s)，其中，s∈[t，m]；e)基于第二亮度值L(j)确定在灰阶j时使对应的第三亮度值Lm(r)和对应的第四亮度值Ls(s)满足预定条件的第i颜色的子像素的主子像素区域的灰阶和次子像素区域的灰阶的取值组合；f)确定在应用每个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差；g)将最小的总色差所对应的取值组合确定为第i颜色的子像素呈现灰阶j时使用的取值组合。
- 根据权利要求1所述的方法，其中，步骤f)中确定在应用任意一个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差的步骤包括：f1)分别获取在应用所述一个取值组合使得第i颜色的子像素呈现灰阶j时所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的三刺激值；f2)基于正视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在正视情况下的心理明度和心理色度，并基于斜视情况下的三刺激值分别计算所 述液晶面板显示的灰阶画面在斜视情况下的心理明度和心理色度；f3)基于所述正视情况下的心理明度和心理色度、所述斜视情况下的心理明度和心理色度，计算所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。
- 根据权利要求1所述的方法，其中，步骤b)包括：基于下面的等式，通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)：L(j)＝L(m)×(j/m)γ其中，γ为预定伽马值，L(m)为第i颜色的子像素在最大灰阶m时的第一亮度值。
- 根据权利要求1所述的方法，其中，步骤c)包括：关闭第i颜色的子像素的次子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的主子像素区域在各个灰阶r时对应的第三亮度值Lm(r)，步骤d)包括：关闭第i颜色的子像素的主子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的次子像素区域在各个灰阶s时对应的第四亮度值Ls(s)。
- 根据权利要求1所述的方法，其中，步骤e)中预定条件可通过下式表示：[Lm(r)+Ls(s)-L(j)]/L(j)<S其中，S为预定值。
- 一种校正液晶面板的子像素的成像时灰阶的方法，所述液晶面板的每一像素包括n个颜色的子像素，其中，n为大于0的整数，每一子像素包括主子像素区域和次子像素区域，其中，所述方法包括：a)测量正视情况下的所述液晶面板的n个颜色中的第i颜色的伽马曲线，以获取所述液晶面板的第i颜色的子像素在最大灰阶m时的第一亮度值，其中， i∈[1，n]；b)通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)，其中，j∈[t，m]，t为最小灰阶；c)确定第i颜色的子像素的主子像素区域的灰阶r和次子像素区域的灰阶s的各个取值组合之中的使所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差小于预定值的取值组合，其中，r∈[t，m]，s∈[t，m]；d)获取正视情况下的第i颜色的子像素的主子像素区域在处于各个确定的取值组合中的主子像素区域的灰阶时对应的第三亮度值；e)获取正视情况下的第i颜色的子像素的次子像素区域在处于各个确定的取值组合中的次子像素区域的灰阶时对应的第四亮度值；f)基于第二亮度值L(j)从确定的取值组合之中获取在灰阶j时使对应的第三亮度值和对应的第四亮度值满足预定条件的取值组合；g)将获取的取值组合确定为第i颜色的子像素呈现灰阶j时使用的取值组合。
- 根据权利要求6所述的方法，其中，步骤c)中的总色差通过如下步骤获得：c1)分别获取所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的三刺激值；c2)基于正视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在正视情况下的心理明度和心理色度，并基于斜视情况下的三刺激值分别计算所述液晶面板显示的灰阶画面在斜视情况下的心理明度和心理色度；c3)基于所述正视情况下的心理明度和心理色度、所述斜视情况下的心理明度和心理色度，计算所述液晶面板显示的灰阶画面在正视情况下和斜视情况下的总色差。
- 根据权利要求6所述的方法，其中，步骤b)包括：基于下面的等式，通过所述第一亮度值和预定伽马值，计算第i颜色的子像素在各个灰阶j时对应的第二亮度值L(j)：L(j)＝L(m)×(j/m)γ其中，γ为预定伽马值，L(m)为第i颜色的子像素在最大灰阶m时的第一亮度值。
- 根据权利要求6所述的方法，其中，步骤d)包括：关闭第i颜色的子像素的次子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的主子像素区域在处于各个确定的取值组合中的主子像素区域的灰阶时对应的第三亮度值，步骤e)包括：关闭第i颜色的子像素的主子像素区域；测量正视情况下的所述液晶面板的第i颜色的伽马曲线，以获取第i颜色的子像素的次子像素区域在处于各个确定的取值组合中的次子像素区域的灰阶时对应的第四亮度值。
- 根据权利要求6所述的方法，其中，步骤f)中的预定条件为使得[Lm(x)+Ls(y)-L(j)]/L(j)最小，其中，Lm(x)为确定的取值组合中的主子像素区域的灰阶x所对应的第三亮度值，Ls(y)为确定的取值组合中的次子像素区域的灰阶y所对应的第四亮度值。
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| CN104599656B (zh) | 2017-04-05 |
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