WO2018036096A1 - 一种四色显示器白平衡过程中颜色漂移的调整方法 - Google Patents

一种四色显示器白平衡过程中颜色漂移的调整方法 Download PDF

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WO2018036096A1
WO2018036096A1 PCT/CN2017/071486 CN2017071486W WO2018036096A1 WO 2018036096 A1 WO2018036096 A1 WO 2018036096A1 CN 2017071486 W CN2017071486 W CN 2017071486W WO 2018036096 A1 WO2018036096 A1 WO 2018036096A1
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color
drift
white
sub
pixel unit
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French (fr)
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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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    • 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
    • G09G3/2003—Display of colours
    • 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
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • 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
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a method for adjusting color drift in a white balance process of a four-color display.
  • a color developing system generally uses a three-color pixel system.
  • each pixel unit is generally composed of three pixel units, which are respectively a red (R) sub-pixel unit and a green (G) sub-pixel. Unit and blue (B) sub-pixel unit.
  • R red
  • G green
  • B blue
  • a new four-pixel system which adds a sub-pixel unit to the traditional three-color pixel, which can improve the performance of the system in display color.
  • FIG. 1 is a schematic diagram of a gamma curve test of a four-color pixel system of the prior art
  • FIG. 2 is a schematic diagram of a standard gamma curve when a white color is normally displayed.
  • curves 1, 2, 3, and 4 are gamma curves of a four-color pixel liquid crystal display when displaying red, green, blue, and white, respectively, and the normal range of a standard white gamma curve should be In an interval centered on 2.2 ⁇ 0.2 to 0.3, such an interval can ensure that the brightness change of white conforms to the perception curve of the human eye, as shown in FIG. 2 .
  • the change in brightness of the four curves in Figure 1 deviates significantly from the above range at higher gray levels, producing an over-bright effect.
  • the patent document "White Balance Method for Four-Color Pixel System” (CN105096890A) adopts a method of illuminating a plurality of sub-pixel units to display in accordance with two different combinations according to the input white gray scale value.
  • White is set; the gray scale value of each sub-pixel unit is adjusted, and the gray scale value of each sub-pixel unit when the white displayed by the two different combinations satisfies the set condition is used as the white gray scale corresponding to the input
  • the four-color grayscale value of the output (CN105096890A) adopts a method of illuminating a plurality of sub-pixel units to display in accordance with two different combinations according to the input white gray scale value.
  • the brightness of the white displayed by the first combination is equal to the brightness of the white gamma curve corresponding to the input white gray scale value
  • the white color chromaticity coordinate of the second combination display is equal to the selected reference
  • the gray scale values of the red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit of the white chromaticity coordinates are output gray scale values corresponding to the input white gray scale.
  • Maintaining a mapping relationship between the grayscale value of the fourth sub-pixel unit and the grayscale value of the red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit in the process of adjusting the grayscale value of each sub-pixel unit A three- to four-color calculation algorithm conforming to the four-color pixel system.
  • the grayscale value of the fourth sub-pixel unit is kept unchanged during the adjustment of the grayscale value of each sub-pixel unit.
  • the first combination includes a red sub-pixel unit, a green sub-pixel unit, a blue sub-pixel unit, and a fourth sub-pixel unit
  • the second combination includes a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit.
  • L v (W i ) is the luminance of white with a gray-scale value of i
  • x i , y i is the chromaticity coordinate of white
  • R i , G i , B i , M i are based on three to four colors.
  • the calculus algorithm is a four-color grayscale value obtained by converting the input three-color grayscale value, R o , G o , B o , M o is the output four-color grayscale value, X( ⁇ ), Y( ⁇ ), Z ( ⁇ ) represents the tristimulus value of each sub-pixel unit, and f represents the gray scale value to the fourth sub-pixel of the red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit that conform to the three-color to four-color calculation algorithm.
  • the mapping relationship of the grayscale values of the cells are examples of the grayscale values obtained by converting the input three-color grayscale value, R o , G o , B o , M o is the output four-color grayscale value, X( ⁇ ), Y( ⁇ ), Z ( ⁇ ) represents the tristimulus value of each sub-pixel unit, and f represents the gray scale value to the fourth sub-pixel of the red sub-pixel unit, the green sub-pixel unit, and the
  • L v (W i ) is the brightness of white with a gray-scale value of i
  • x i , y i is the chromaticity coordinate of white
  • R o , G o , B o , M o are the four-color gray scale of the output.
  • the values X( ⁇ ), Y( ⁇ ), Z( ⁇ ) represent the tristimulus values of the respective sub-pixel units
  • f represents the red sub-pixel unit, the green sub-pixel unit, and the blue corresponding to the three-color to four-color calculation algorithm.
  • the white grayscale color is generally adjusted to the vicinity of the target (x, y), it may cause a bad result: low
  • the red-blue color mixture in the gray-scale region that is, the purple drift drifts out of the correct range of human perception, that is, in the case where the white chromaticity is relatively normal, the purple has a low-gray red phenomenon, drifting out of the purple range.
  • This problem does not occur in the traditional three-color white balance process.
  • the fourth sub-pixel is used to display white together, and the fourth sub-pixel often does not participate in displaying a two-color mixed picture such as purple. This has led to this type of anomaly, as shown in Figures 3 and 4.
  • the present invention proposes a four-color display white balance. The method of adjusting the color drift in the process.
  • the brightness of the combined display is obtained according to the stimulation value Y of the red sub-pixel unit, the green sub-pixel unit, the blue sub-pixel unit, and the fourth sub-pixel unit, and is equal to a grayscale value ranging from 0 to 255.
  • step S10 the grayscale value of each sub-pixel unit is adjusted according to the following expression:
  • L v (W i ) is the white brightness of the gray-scale value i
  • R o , G o , B o , M o are the output four-color gray scale values
  • Y(R o ), Y(G o ) Y(B o ) and Y(M o ) respectively represent the stimulation values of the respective sub-pixel units.
  • step S20 for the case of two-color balance, the specific process of color drift adjustment in the white balance process of the four-color display is as follows:
  • the 0-255 grayscale value is divided into two intervals: 0 ⁇ n and n+1 ⁇ 255, two weighting factors a, b corresponding to the interval 0 ⁇ n, and the other two weighting factors c, d corresponding to the interval n+1 ⁇ 255;
  • c ⁇ x 1 +d ⁇ x 2 (X(R o )+X(G o )+X(B o )+X(M o ))/S;
  • R o , G o , B o , M o are output four-color gray scale values
  • X( ⁇ ), Y( ⁇ ), Z( ⁇ ) respectively represent the X, Y, Z stimulus values of each sub-pixel unit
  • f represents the red sub-pixel unit, green in accordance with the calculation algorithm of three to four colors.
  • the process of determining the four-color grayscale values R o , G o , B o , M o in the specific process of color drift adjustment in the four-color display white balance process can be converted into the minimum delta
  • the process of the process is:
  • white is matched while balancing purple drift, orange drift, yellow drift or cyan drift.
  • step S20 for the case of three-color balance, the specific process of color drift adjustment in the white balance process of the four-color display is as follows:
  • the 0-255 grayscale value is divided into two intervals: 0 ⁇ n and n+1 ⁇ 255, three weighting factors e, f, g correspond to the interval 0 ⁇ n, and the other three weighting factors h, i, j correspond to Interval n+1 to 255;
  • h ⁇ x 1 +i ⁇ x 2 +j ⁇ x 3 (X(R o )+X(G o )+X(B o )+X(M o ))/S;
  • R o , G o , B o , M o are output four-color gray scale values
  • X( ⁇ ), Y( ⁇ ), Z( ⁇ ) respectively represent the X, Y, Z stimulus values of each sub-pixel unit
  • f represents the red sub-pixel unit, green in accordance with the calculation algorithm of three to four colors.
  • the white is matched while drifting to purple and orange, drifting to purple and yellow, drifting to purple and cyan, drifting to orange and yellow, drifting to orange and cyan, or to yellow and The cyan drift is balanced.
  • step S20 for the case of four-color balance, the specific process of color drift adjustment in the white balance process of the four-color display is as follows:
  • the 0-255 grayscale value is divided into two intervals: 0 ⁇ n and n+1 ⁇ 255, four weighting factors k, l, m, n correspond to interval 0 ⁇ n, and the other four weighting factors o, p, q , r corresponds to the interval n+1 ⁇ 255;
  • R o , G o , B o , M o are output four-color gray scale values
  • X( ⁇ ), Y( ⁇ ), Z( ⁇ ) respectively represent the X, Y, Z stimulus values of each sub-pixel unit
  • f represents the red sub-pixel unit, green in accordance with the calculation algorithm of three to four colors.
  • the white is matched while shifting to purple, orange and yellow, to purple, orange and cyan drift, to purple, yellow and cyan drift or to orange, yellow and cyan drift. .
  • the value of the value of n in the specific process of color drift adjustment during white balance of the four-color display is: n is smaller than the white balance of the four-color pixel system.
  • the adjustment of the weighting factor causes each color to deviate from the target to a different degree without deviating too much to cause obvious macroscopic Visual distortion.
  • FIG. 1 shows a schematic diagram of a gamma curve of a prior art four-color pixel system
  • Figure 2 shows a schematic diagram of a standard gamma curve when white is normally displayed
  • the solid line in Figure 3 shows the normal purple chromaticity curve (X-axis) and the dashed line showing the chromaticity curve (X-axis) after four-color pixel system white balance;
  • FIG. 5 is a flow chart showing the operation of the method for adjusting the color shift during the white balance process of the four-color display of the present invention.
  • the solid line in Figure 3 shows the normal purple chromaticity curve (X-axis) and the dashed line shows the chromaticity curve (X-axis) after four-color pixel system white balance; the solid line in Figure 4 shows the normal purple chromaticity curve (Y) The axis and dashed lines show the chromaticity curve (Y-axis) after white balance of the four-color pixel system.
  • Embodiment 1 As shown in FIG. 5, the method for adjusting the color drift in the white balance process of the four-color display used in the embodiment is performed as follows:
  • the brightness of the combined display is obtained according to the stimulation value Y of the red sub-pixel unit, the green sub-pixel unit, the blue sub-pixel unit, and the fourth sub-pixel unit, and is equal to the corresponding gray scale value in the range of 0 to 255.
  • Standard white The brightness of the gamma curve;
  • L v (W i ) is the white brightness of the gray-scale value i
  • R o , G o , B o , M o are the output four-color gray scale values, Y(R o ), Y(G o ) , Y(B o ), Y(M o ) respectively represent the stimulation values of the respective sub-pixel units;
  • the 0-255 grayscale value is divided into two intervals: 0 ⁇ n and n+1 ⁇ 255, two weighting factors a, b corresponding to the interval 0 ⁇ n, and the other two weighting factors c, d corresponding to the interval n+1 ⁇ 255;
  • c ⁇ x 1 +d ⁇ x 2 (X(R o )+X(G o )+X(B o )+X(M o ))/S;
  • R o , G o , B o , M o are output four-color gray scale values
  • X( ⁇ ), Y( ⁇ ), Z( ⁇ ) respectively represent the X, Y, Z stimulus values of each sub-pixel unit
  • f represents the red sub-pixel unit, green in accordance with the calculation algorithm of three to four colors.
  • This embodiment has the following beneficial effects: for the case of two-color balance, that is, the case where there is only one color shift, by using the weighting factor to balance the first target color (white) and the second target color, both colors are achieved.
  • the display effect of the four-color display is improved without the purpose of distortion visible to the naked eye.
  • the second embodiment is a further description of the method for adjusting the color drift in the white balance process of the four-color display according to the first embodiment.
  • the white is matched and the purple drift is adjusted. .
  • the third embodiment is a further description of the method for adjusting the color drift in the white balance process of the four-color display according to the first embodiment.
  • the white is matched and the orange drift is adjusted. .
  • Embodiment 4 further describes a method for adjusting color drift in a white balance process of a four-color display according to the first embodiment.
  • white is matched and the yellow drift is adjusted. .
  • Embodiment 5 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to the first embodiment. In the two-color balance process, white is matched and the cyan drift is adjusted. .
  • Embodiment 6 As shown in FIG. 5, the method for adjusting the color drift in the white balance process of the four-color display used in the embodiment is performed as follows:
  • the brightness of the combined display is obtained according to the stimulation value Y of the red sub-pixel unit, the green sub-pixel unit, the blue sub-pixel unit, and the fourth sub-pixel unit, and is equal to the corresponding gray scale value in the range of 0 to 255.
  • L v (W i ) is the white brightness of the gray-scale value i
  • R o , G o , B o , M o are the output four-color gray scale values, Y(R o ), Y(G o ) , Y(B o ), Y(M o ) respectively represent the stimulation values of the respective sub-pixel units;
  • the 0-255 grayscale value is divided into two intervals: 0 ⁇ n and n+1 ⁇ 255, three weighting factors e, f, g correspond to the interval 0 ⁇ n, and the other three weighting factors h, i, j correspond to Interval n+1 to 255;
  • h ⁇ x 1 +i ⁇ x 2 +j ⁇ x 3 (X(R o )+X(G o )+X(B o )+X(M o ))/S;
  • R o , G o , B o , M o are output four-color gray scale values
  • X( ⁇ ), Y( ⁇ ), Z( ⁇ ) respectively represent the X, Y, Z stimulus values of each sub-pixel unit
  • f represents the red sub-pixel unit, green in accordance with the calculation algorithm of three to four colors.
  • This embodiment has the following beneficial effects: for the case of three-color balance, that is, there are two kinds of color drift cases, the adjustment effect of the weighting factors causes each color to deviate from the target to a different extent but does not deviate too much to cause obvious macroscopic appearance. Visual distortion.
  • Embodiment 7 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 6. During the three-color balance process, white is matched while drifting to purple and orange. Make adjustments.
  • Embodiment 8 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 6, in which three colors are matched, and white and yellow are drifted. Make adjustments.
  • Embodiment 9 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 6. In the three-color balance process, white is matched while drifting to purple and cyan Make adjustments.
  • Embodiment 10 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 6, in which three colors are matched, and white and yellow are drifted. Make adjustments.
  • Embodiment 11 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 6, in which a white color is matched, and at the same time, orange and cyan are matched. Drift to adjust.
  • Embodiment 12 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 6.
  • white is matched, and yellow and cyan are simultaneously applied. Drift to adjust.
  • Embodiment 13 As shown in FIG. 5, the method for adjusting the color drift in the white balance process of the four-color display used in the embodiment is performed as follows:
  • the brightness of the combined display is obtained according to the stimulation value Y of the red sub-pixel unit, the green sub-pixel unit, the blue sub-pixel unit, and the fourth sub-pixel unit, and is equal to the corresponding gray scale value in the range of 0 to 255.
  • L v (W i ) is the white brightness of the gray-scale value i
  • R o , G o , B o , M o are the output four-color gray scale values, Y(R o ), Y(G o ) , Y(B o ), Y(M o ) respectively represent the stimulation values of the respective sub-pixel units;
  • the 0-255 grayscale value is divided into two intervals: 0 ⁇ n and n+1 ⁇ 255, four weighting factors k, l, m, n correspond to interval 0 ⁇ n, and the other four weighting factors o, p, q , r corresponds to the interval n+1 ⁇ 255;
  • R o , G o , B o , M o are output four-color gray scale values
  • X( ⁇ ), Y( ⁇ ), Z( ⁇ ) respectively represent the X, Y, Z stimulus values of each sub-pixel unit
  • f represents the red sub-pixel unit, green in accordance with the calculation algorithm of three to four colors.
  • This embodiment has the following beneficial effects: for the case of four-color balance, that is, there are three kinds of color drift cases, by adjusting the weighting factors, each color is deviated from the target to a different extent but does not deviate too much to cause obvious naked eyes. Visual distortion.
  • Embodiment 14 is a further description of a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 13 in the four-color balance process, and matching white , orange and yellow Color drift is adjusted.
  • Embodiment 15 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 13, in which the white color is matched during the four-color balance process, and also is purple. , orange and cyan drift to adjust.
  • Embodiment 16 This embodiment further describes a method for adjusting color drift in a white balance process of a four-color display according to Embodiment 13, in which four colors are matched, and white is matched, and at the same time, purple , yellow and cyan drift to adjust.
  • Embodiment 17 is a further description of the method for adjusting the color drift in the white balance process of the four-color display according to the thirteenth embodiment.
  • the white is matched, and at the same time, the orange is also , yellow and cyan drift to adjust.
  • Embodiment 18 is a further description of the method for adjusting the color drift in the white balance process of the four-color display according to Embodiments 1 to 5, and the four-color gray scale values R o , G o , B o , M
  • the process of o can be transformed into the process of finding the minimum Delta, the specific process:
  • Delta1 is the actual chromaticity coordinates (X(R o )+X(G o )+X(B o )+X(M o ))/S with the target x 1 and (X(R o )+X The sum of the squares of the difference between (G o )+X(B o )+X(M o ))/S and the target y 1 , or the square of the distance between the actual color position and the target color in the chromaticity space. The same is true for Delta 2, which is the distance between the actual chromaticity coordinates and the target (x 2 , y 2 ).
  • the ninth embodiment is a further description of the method for adjusting the color drift in the white balance process of the four-color display according to the first to eighteenth embodiments.
  • the value of the n value is: n is smaller than four colors.

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Abstract

公开了一种四色显示器白平衡过程中颜色漂移的调整方法。该方法包括根据红色子像素单元、绿色子像素单元、蓝色子像素单元以及第四子像素单元的刺激值Ｙ得到组合显示的白色的亮度；对于二色平衡、三色平衡或四色平衡情况，通过采用权重因子分别对白色和一个/两个/三个产生漂移的颜色进行平衡。

Description

一种四色显示器白平衡过程中颜色漂移的调整方法
本申请要求享有2016年8月24日提交的名称为“一种四色显示器白平衡过程中颜色漂移的调整方法”的中国专利申请CN201610715499.3的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及液晶显示技术领域，尤其涉及一种四色显示器白平衡过程中颜色漂移的调整方法。
背景技术
目前，彩色显像系统普遍应用的是三色像素系统，以液晶显示器为例，其每个像素单元一般由三个像素单元组成，分别为红色(R)子像素单元、绿色(G)子像素单元以及蓝色(B)子像素单元。而一种新的四像素系统，其在传统的三色像素的基础上增加了一个子像素单元，进而可以提升系统在显示色彩方面的表现力。
随着四色像素系统的发展，由三色(RGB)到四色(RGBM)的转换技术已经基本成熟，相应的产品也已经开始进入实际应用阶段，但由于现有大部分采用四色像素的产品缺乏有效的白平衡调节技术，致使显像效果不佳，因而未能充分发挥四色像素系统的优势。
图1为现有技术的四色像素系统的伽马曲线测试示意图，图2为正常显示白色时的标准伽马曲线示意图。如图1所示，曲线1、2、3、4分别为四色像素液晶显示器在显示红色、绿色、蓝色以及白色时的伽马曲线，而一个标准的白色的伽马曲线的正常范围应当在以2.2为中心±0.2～0.3的一个区间内，这样的一个区间可以保证白色的亮度变化符合人眼的感知曲线，如图2所示。图1中的四条曲线的亮度变化在较高的灰阶处均严重偏离了上述范围，会产生一种过亮的效果。
为了解决上述技术问题，专利文献《一种四色像素系统的白平衡方法》(CN105096890A)采用如下方法：根据输入的白色灰阶值，按照两种不同的组合分别点亮多个子像素单元以显示出白色；调整各子像素单元的灰阶值，并将使两种不同的组合所显示出的白色满足设定条件时的各子像素单元的灰阶值作为与输入的白色灰阶相对应的 输出的四色灰阶值。
使第一种组合显示的白色的亮度等于与所述输入的白色灰阶值相对应的符合伽马曲线的白色的亮度，且使第二种组合显示的白色的色度坐标等于选做基准的白色的色度坐标的红色子像素单元、绿色子像素单元与蓝色子像素单元的灰阶值作为与输入的白色灰阶相对应的输出灰阶值。根据所述四色像素系统的三色到四色的演算算法以及红色子像素单元、绿色子像素单元与蓝色子像素单元的输出灰阶值得到所述第四子像素单元的输出灰阶值。
在调整各子像素单元的灰阶值的过程中保持所述第四子像素单元的灰阶值与所述红色子像素单元、绿色子像素单元与蓝色子像素单元的灰阶值的映射关系符合所述四色像素系统的三色到四色的演算算法。在调整各子像素单元的灰阶值的过程中保持所述第四子像素单元的灰阶值不变。
第一种组合包括红色子像素单元、绿色子像素单元、蓝色子像素单元和第四子像素单元，第二种组合包括红色子像素单元、绿色子像素单元和蓝色子像素单元。根据第一种组合中各子像素单元的刺激值Y得到第一种组合显示的白色的亮度，根据第二种组合中各子像素单元的三刺激值XYZ得到第二种组合显示的白色的色度坐标。
根据如下表达式调整各子像素单元的灰阶值：
Figure PCTCN2017071486-appb-000001
且
Figure PCTCN2017071486-appb-000002
其中，Lv(Wi)为灰阶值为i的白色的亮度，xi,yi为白色的色度坐标，Ri,Gi,Bi,Mi为基于三色到四色的演算算法由输入的三色灰阶值转换得到的四色灰阶值，Ro,Go,Bo,Mo为输出的四色灰阶值，X(·),Y(·),Z(·)表示各子像素单元的三刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元的灰阶值的映射关系。
根据红色子像素单元、绿色子像素单元、蓝色子像素单元以及第四子像素单元的刺激值Y得到第一种组合显示的白色的亮度，根据这四个子像素单元的三刺激值XYZ得到第二种组合显示的白色的色度坐标。
根据如下表达式调整各子像素单元的灰阶值：
Figure PCTCN2017071486-appb-000003
且
Figure PCTCN2017071486-appb-000004
式中，Lv(Wi)为灰阶值为i的白色的亮度，xi,yi为白色的色度坐标，Ro,Go,Bo,Mo为输出的四色灰阶值X(·),Y(·),Z(·)表示各子像素单元的三刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元的灰阶值的映射关系。
但是，在针对四色像素系统的白平衡进行调解的过程中，会出现下面的问题，当白色的灰阶颜色被普遍地调整到目标(x,y)附近时，会导致一个不良结果：低灰阶区域的红蓝混色，即紫色漂移出人眼感知的正确范围，即在白色色度较为正常的情况下，紫色出现了低灰阶泛红的现象，漂移出了紫色的范围。这个问题在传统的三色白平衡过程中不会出现，而在四色系统中，由于使用了第四子像素来共同显示白色，而第四子像素往往不参与显示紫色这样的两色混合画面，导致了这一类反常的现象，如图3和图4所示。
发明内容
针对上述现有技术中的问题，即现有四色像素系统中，在白平衡匹配完成后，会产生颜色漂移出人眼感知的正确范围的问题，本发明提出了一种四色显示器白平衡过程中颜色漂移的调整方法。
S10、根据红色子像素单元、绿色子像素单元、蓝色子像素单元以及第四子像素单元的刺激值Y得到组合显示的白色的亮度，并使其在灰阶值为0～255范围内等于相对应的标准白色伽马曲线的亮度；
S20、对于二色平衡、三色平衡或四色平衡情况下，通过采用权重因子分别对白色和一个产生漂移的颜色，或对白色和两个产生漂移的颜色，或对白色和三个两个产生漂移的颜色进行平衡。
优选地，步骤S10中，根据如下表达式调整各子像素单元的灰阶值：
Lv(Wi)＝Y(Ro)+Y(Go)+Y(Bo)+Y(Mo)；
其中，Lv(Wi)为灰阶值为i的白色的亮度，Ro，Go，Bo，Mo为输出的四色灰阶值，Y(Ro)，Y(Go)，Y(Bo)，Y(Mo)分别表示各子像素单元的刺激值。
优选地，步骤S20中，对于两色平衡的情况，四色显示器白平衡过程中颜色漂移调整的具体过程如下：
将0-255灰阶值划分为两区间：0～n和n+1～255，两个权重因子a，b对应于区间0～n，另两个权重因子c，d对应于区间n+1～255；
两色平衡时，不仅对白色进行匹配，同时对产生漂移的颜色进行平衡；
设定白色的目标色度为x1，y1，产生漂移颜色的目标色度为x2，y2；
则a×x1+b×x2＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
a×y1+b×y2＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
以及
c×x1+d×x2＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
c×y1+d×y2＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
其中，a+b＝1，c+d＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
且有
Figure PCTCN2017071486-appb-000005
其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
优选地，对于两色平衡的情况，四色显示器白平衡过程中颜色漂移调整的具体过程中四色灰阶值Ro,Go,Bo,Mo的求取过程可转化为求最小Delta的过程，其具体过程为：
Delta1＝((X(Ro)+X(Go)+X(Bo)+X(Mo))/S-x1)2+((Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S-y1)2
Delta2＝((X(Ro)+X(Bo))/S-x2)2+((Y(Ro)+Y(Bo))/S-y2)2
Delta＝a×Delta1+b×Delta2，其中a+b＝1。
优选地，步骤S20中两色平衡时，对白色进行匹配，同时对紫色漂移、橙色漂移、黄色漂移或青色漂移进行平衡。
优选地，步骤S20中，对于三色平衡的情况，四色显示器白平衡过程中颜色漂移调整的具体过程如下：
将0-255灰阶值划分为两区间：0～n和n+1～255，三个权重因子e，f，g对应于区间0～n，另三个权重因子h，i，j对应于区间n+1～255；
三色平衡时，不仅对白色进行匹配，同时对产生漂移的两个颜色进行平衡；
设定白色的目标色度为x1，y1，产生漂移的两个颜色的目标色度分别为x2，y2和x3，y3；
则e×x1+f×x2+g×x3＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
e×y1+f×y2+g×y3＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
以及
h×x1+i×x2+j×x3＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
h×y1+i×y2+j×y3＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
其中，e+f+g＝1，h+i+j＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
且有
Figure PCTCN2017071486-appb-000006
其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
优选地，步骤S20中三色平衡时，对白色进行匹配，同时对紫色和橙色漂移、对紫色和黄色漂移、对紫色和青色漂移、对橙色和黄色漂移、对橙色和青色漂移或对黄色和青色漂移进行平衡。
优选地，步骤S20中，对于四色平衡的情况，四色显示器白平衡过程中颜色漂移调整的具体过程如下：
将0-255灰阶值划分为两区间：0～n和n+1～255，四个权重因子k，l，m，n对应于区间0～n，另四个权重因子o，p，q，r对应于区间n+1～255；
四色平衡时，不仅对白色进行匹配，同时对产生漂移的三个颜色进行平衡；
设定白色的目标色度为x1，y1，产生偏移的三种颜色的目标色度分别为x2，y2、x3，y3和x4，y4；
则k×x1+l×x2+m×x3+n×x4＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
k×y1+l×y2+m×y3+n×y4＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
以及
o×x1+p×x2+q×x3+r×x4＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
o×y1+p×y2+q×y3+r×y4＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
其中，k+l+m+n＝1，o+p+q+r＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
且有
Figure PCTCN2017071486-appb-000007
其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
优选地，步骤S20中四色平衡时，对白色进行匹配，同时对紫色、橙色和黄色漂移、对紫色、橙色和青色漂移、对紫色、黄色和青色漂移或对橙色、黄色和青色漂移进行平衡。
优选地，对于两色、三色或四色平衡的情况，四色显示器白平衡过程中颜色漂移调整的具体过程中所述n值的取值条件为：n小于四色像素系统白平衡后的色度曲线中拐点所对应的灰阶值。
与现有技术相比，上述方案中的一个或多个实施例具有如下优点或有益效果：
对于二色平衡的情况，即仅有一种颜色漂移的情况，通过采用权重因子对第一目标颜色(白色)和第二目标颜色的权衡，来达到两种颜色均不发生肉眼可见的失真的目的，改 善四色显示器的显示效果。
对于三色平衡或四色平衡的情况，即有两种或三种颜色漂移的情况，通过权重因子的调节作用，使得各个颜色均不同程度偏离目标但又不至于偏离太多引起明显的肉眼可视失真现象。
本发明的其他优点、目标和特征在某种程度上将在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对上下文的考察研究对本领域技术人员而言将是显而易见的，或者可已从本发明实践中得到教导。本发明的目标和其他优点可以通过下面的说明书，权利要求书，以及附图中所特别指出的结构来实现和获得。
附图说明
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中
图1显示了现有技术的四色像素系统的伽马曲线示意图；
图2显示了正常显示白色时的标准伽马曲线示意图；
图3实线显示了正常的紫色色度曲线(X轴)和虚线显示了四色像素系统白平衡后的色度曲线(X轴)；
图4实线显示了正常的紫色色度曲线(Y轴)和虚线显示了四色像素系统白平衡后的色度曲线(Y轴)；
图5显示了本发明的四色显示器白平衡过程中颜色漂移的调整方法的工作流程图。
在附图中，相同的部件使用相同的附图标记。附图并未按照实际的比例。
具体实施方式
下面将结合附图对本发明作进一步说明。
图3实线显示了正常的紫色色度曲线(X轴)和虚线显示了四色像素系统白平衡后的色度曲线(X轴)；图4实线显示了正常的紫色色度曲线(Y轴)和虚线显示了四色像素系统白平衡后的色度曲线(Y轴)。
实施例一、如图5所示、本实施例所采用的一种四色显示器白平衡过程中颜色漂移的调整方法按以下步骤进行：
根据红色子像素单元、绿色子像素单元、蓝色子像素单元以及第四子像素单元的刺激值Y得到组合显示的白色的亮度，并使其在灰阶值为0～255范围内等于相对应的标准白 色伽马曲线的亮度；
Lv(Wi)＝Y(Ro)+Y(Go)+Y(Bo)+Y(Mo)
其中，Lv(Wi)为灰阶值为i的白色的亮度，Ro，Go，Bo，Mo为输出的四色灰阶值，Y(Ro)，Y(Go)，Y(Bo)，Y(Mo)分别表示各子像素单元的刺激值；
将0-255灰阶值划分为两区间：0～n和n+1～255，两个权重因子a，b对应于区间0～n，另两个权重因子c，d对应于区间n+1～255；
两色平衡时，不仅对白色进行匹配，同时对产生漂移的颜色进行平衡；
设定白色的目标色度为x1，y1，产生偏移颜色的目标色度为x2，y2；
则a×x1+b×x2＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
a×y1+b×y2＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
以及
c×x1+d×x2＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
c×y1+d×y2＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
其中，a+b＝1，c+d＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
且有
Figure PCTCN2017071486-appb-000008
其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
本实施方式具有以下有益效果：对于二色平衡的情况，即仅有一种颜色漂移的情况，通过采用权重因子对第一目标颜色(白色)和第二目标颜色的权衡，来达到两种颜色均不发生肉眼可见的失真的目的，改善四色显示器的显示效果。
实施例二、本实施例是对实施例一所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，两色平衡过程中，对白色进行匹配同时，对紫色漂移进行调整。
实施例三、本实施例是对实施例一所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，两色平衡过程中，对白色进行匹配同时，对橙色漂移进行调整。
实施例四、本实施例是对实施例一所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，两色平衡过程中，对白色进行匹配同时，对黄色漂移进行调整。
实施例五、本实施例是对实施例一所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，两色平衡过程中，对白色进行匹配同时，对青色漂移进行调整。
实施例六、如图5所示、本实施例所采用的一种四色显示器白平衡过程中颜色漂移的调整方法按以下步骤进行：
根据红色子像素单元、绿色子像素单元、蓝色子像素单元以及第四子像素单元的刺激值Y得到组合显示的白色的亮度，并使其在灰阶值为0～255范围内等于相对应的标准白色伽马曲线的亮度；
Lv(Wi)＝Y(Ro)+Y(Go)+Y(Bo)+Y(Mo)；
其中，Lv(Wi)为灰阶值为i的白色的亮度，Ro，Go，Bo，Mo为输出的四色灰阶值，Y(Ro)，Y(Go)，Y(Bo)，Y(Mo)分别表示各子像素单元的刺激值；
将0-255灰阶值划分为两区间：0～n和n+1～255，三个权重因子e，f，g对应于区间0～n，另三个权重因子h，i，j对应于区间n+1～255；
三色平衡时，不仅对白色进行匹配，同时对产生漂移的两个颜色进行平衡；
设定白色的目标色度为x1，y1，产生漂移的两个颜色的目标色度分别为x2，y2和x3，y3；
则e×x1+f×x2+g×x3＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
e×y1+f×y2+g×y3＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
以及
h×x1+i×x2+j×x3＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
h×y1+i×y2+j×y3＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
其中，e+f+g＝1，h+i+j＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
且有
Figure PCTCN2017071486-appb-000009
其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
本实施例具有以下有益效果：对于三色平衡的情况，即有两种颜色漂移的情况，通过权重因子的调节作用，使得各个颜色均不同程度偏离目标但又不至于偏离太多引起明显的肉眼可视失真现象。
实施例七、本实施例是对实施例六所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，三色平衡过程中，对白色进行匹配，同时对紫色和橙色漂移进行调整。
实施例八、本实施例是对实施例六所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，三色平衡过程中，对白色进行匹配，同时对紫色和黄色漂移进行调整。
实施例九、本实施例是对实施例六所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，三色平衡过程中，对白色进行匹配，同时对紫色和青色漂移进行调整。
实施例十、本实施例是对实施例六所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，三色平衡过程中，对白色进行匹配，同时对橙色和黄色漂移进行调整。
实施例十一、本实施例是对实施例六所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，三色平衡过程中，对白色进行匹配，同时对橙色和青色漂移进行调整。
实施例十二、本实施例是对实施例六所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，三色平衡过程中，对白色进行匹配，同时对黄色和青色漂移进行调整。
实施例十三、如图5所示、本实施例所采用的一种四色显示器白平衡过程中颜色漂移的调整方法按以下步骤进行：
根据红色子像素单元、绿色子像素单元、蓝色子像素单元以及第四子像素单元的刺激值Y得到组合显示的白色的亮度，并使其在灰阶值为0～255范围内等于相对应的标准白色伽马曲线的亮度；
Lv(Wi)＝Y(Ro)+Y(Go)+Y(Bo)+Y(Mo)；
其中，Lv(Wi)为灰阶值为i的白色的亮度，Ro，Go，Bo，Mo为输出的四色灰阶值，Y(Ro)，Y(Go)，Y(Bo)，Y(Mo)分别表示各子像素单元的刺激值；
将0-255灰阶值划分为两区间：0～n和n+1～255，四个权重因子k，l，m，n对应于区间0～n，另四个权重因子o，p，q，r对应于区间n+1～255；
四色平衡时，不仅对白色进行匹配，同时对产生漂移的三个颜色进行平衡；
设定白色的目标色度为x1，y1，产生偏移的三种颜色的目标色度分别为x2，y2、x3，y3和x4，y4；
则k×x1+l×x2+m×x3+n×x4＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
k×y1+l×y2+m×y3+n×y4＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
以及
o×x1+p×x2+q×x3+r×x4＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
o×y1+p×y2+q×y3+r×y4＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
其中，k+l+m+n＝1，o+p+q+r＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
且有
Figure PCTCN2017071486-appb-000010
其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
本实施方式具有以下有益效果：对于四色平衡的情况，即有三种颜色漂移的情况，通过权重因子的调节作用，使得各个颜色均不同程度偏离目标但又不至于偏离太多引起明显的肉眼可视失真现象。
实施例十四、本实施例是对实施例十三所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，四色平衡过程中，对白色进行匹配，同时还对紫色、橙色和黄 色漂移进行调整。
实施例十五、本实施例是对实施例十三所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，四色平衡过程中，对白色进行匹配，同时还对紫色、橙色和青色漂移进行调整。
实施例十六、本实施例是对实施例十三所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，四色平衡过程中，对白色进行匹配，同时还对紫色、黄色和青色漂移进行调整。
实施例十七、本实施例是对实施例十三所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，四色平衡过程中，对白色进行匹配，同时还对橙色、黄色和青色漂移进行调整。
实施例十八、本实施例是对实施例一至五所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，四色灰阶值Ro,Go,Bo,Mo的求取过程可转化为求最小Delta的过程，其具体过程：
Delta1＝((X(Ro)+X(Go)+X(Bo)+X(Mo))/S-x1)2+((Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S-y1)2
Delta2＝((X(Ro)+X(Go))/S-x2)2+((Y(Ro)+Y(Bo))/S-y2)2
Delta＝a×Delta1+b×Delta2，其中a+b＝1。
具体来说，Delta1是实际色度坐标(X(Ro)+X(Go)+X(Bo)+X(Mo))/S与目标x1以及(X(Ro)+X(Go)+X(Bo)+X(Mo))/S与目标y1的差的平方和，或者说，是在色度空间中实际颜色位置与目标颜色的距离的平方。Delta 2同理，是实际色度坐标与目标(x2,y2)的距离。
实施例十九、本实施例是对实施例一至十八所述的一种四色显示器白平衡过程中颜色漂移的调整方法的进一步说明，所述n值的取值条件为：n小于四色像素系统白平衡后的色度曲线中拐点所对应的灰阶值。
虽然在本文中参照了特定的实施方式来描述本发明，但是应该理解的是，这些实施例仅仅是本发明的原理和应用的示例。因此应该理解的是，可以对示例性的实施例进行许多修改，并且可以设计出其他的布置，只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是，可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是，结合单独实施例所描述的特征可以使用在其他所述实施例中。

Claims (14)

  1. 一种四色显示器白平衡过程中颜色漂移的调整方法，包括下述步骤：
    S10、根据红色子像素单元、绿色子像素单元、蓝色子像素单元以及第四子像素单元的刺激值Y得到组合显示的白色的亮度，并使其在灰阶值为0～255范围内等于相对应的标准白色伽马曲线的亮度；
    S20、对于二色平衡、三色平衡或四色平衡情况下，通过使用权重因子分别对白色和一个产生漂移的颜色，或对白色和两个产生漂移的颜色，或对白色和三个产生漂移的颜色进行平衡。
  2. 如权利要求1所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述步骤S10中，根据如下表达式调整各子像素单元的灰阶值：
    Lv(Wi)＝Y(Ro)+Y(Go)+Y(Bo)+Y(Mo)；
    其中，Lv(Wi)为灰阶值为i的白色的亮度，Ro，Go，Bo，Mo为输出的四色灰阶值，Y(Ro)，Y(Go)，Y(Bo)，Y(Mo)分别表示各子像素单元的刺激值。
  3. 如权利要求1所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述步骤S20中，对于两色平衡的情况，通过以下方式分配权重因子，对四色显示器白平衡过程中的颜色漂移进行调整：
    将0-255灰阶值划分为两区间：0～n和n+1～255，两个权重因子a，b对应于区间0～n，另两个权重因子c，d对应于区间n+1～255；
    设定白色的目标色度为x1，y1，产生漂移颜色的目标色度为x2，y2；
    则a×x1+b×x2＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
    a×y1+b×y2＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
    以及
    c×x1+d×x2＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
    c×y1+d×y2＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
    其中，a+b＝1，c+d＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
    且有
    Figure PCTCN2017071486-appb-100001
    其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
  4. 如权利要求1所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述两色平衡是指对白色进行匹配，同时对紫色漂移，或同时对橙色漂移，或同时对黄色漂移，或同时对青色漂移进行平衡。
  5. 如权利要求3所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述两色平衡是指对白色进行匹配，同时对紫色漂移，或同时对橙色漂移，或同时对黄色漂移，或同时对青色漂移进行平衡。
  6. 如权利要求1所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述步骤S20中，对于三色平衡的情况，通过以下方法分配权重因子，对四色显示器白平衡过程中的颜色漂移进行调整：
    将0-255灰阶值划分为两区间：0～n和n+1～255，三个权重因子e，f，g对应于区间0～n，另三个权重因子h，i，j对应于区间n+1～255；
    设定白色的目标色度为x1，y1，产生漂移的两个颜色的目标色度分别为x2，y2和x3，y3；
    则e×x1+f×x2+g×x3＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
    e×y1+f×y2+g×y3＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
    以及
    h×x1+i×x2+j×x3＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
    h×y1+i×y2+j×y3＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
    其中，e+f+g＝1，h+i+j＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
    且有
    Figure PCTCN2017071486-appb-100002
    其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
  7. 如权利要求1所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述三色平衡是指对白色进行匹配，同时对紫色和橙色漂移，或同时对紫色和黄色漂移、或同时对紫色和青色漂移、或同时对橙色和黄色漂移、或同时对橙色和青色漂移，或同时对黄色和青色漂移进行平衡。
  8. 如权利要求6所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述三色平衡是指对白色进行匹配，同时对紫色和橙色漂移，或同时对紫色和黄色漂移、或同时对紫色和青色漂移、或同时对橙色和黄色漂移、或同时对橙色和青色漂移，或同时对黄色和青色漂移进行平衡。
  9. 如权利要求1所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述步骤S20中，对于四色平衡的情况，通过以下方式分配权重因子，对四色显示器白平衡过程中的颜色漂移进行调整：
    将0-255灰阶值划分为两区间：0～n和n+1～255，四个权重因子k，l，m，n对应于区间0～n，另四个权重因子o，p，q，r对应于区间n+1～255；
    设定白色的目标色度为x1，y1，产生偏移的三种颜色的目标色度分别为x2，y2、x3，y3和x4，y4；
    则k×x1+l×x2+m×x3+n×x4＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
    k×y1+l×y2+m×y3+n×y4＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；0≤输入灰阶值≤n时
    以及
    o×x1+p×x2+q×x3+r×x4＝(X(Ro)+X(Go)+X(Bo)+X(Mo))/S；
    o×y1+p×y2+q×y3+r×y4＝(Y(Ro)+Y(Go)+Y(Bo)+Y(Mo))/S；n+1≤输入灰阶值≤255时
    其中，k+l+m+n＝1，o+p+q+r＝1；Ro,Go,Bo,Mo为输出的四色灰阶值；
    且有
    Figure PCTCN2017071486-appb-100003
    其中，X(·)，Y(·)，Z(·)分别表示各子像素单元的X，Y，Z刺激值，f表示符合三色到四色的演算算法的由红色子像素单元、绿色子像素单元以及蓝色子像素单元的灰阶值到第四子像素单元灰阶值的映射关系。
  10. 如权利要求1所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述四色平衡是指对白色进行匹配，同时对紫色、橙色和黄色漂移，或同时对紫色、橙色和青色漂移，或同时对紫色、黄色和青色漂移，或同时对橙色、黄色和青色漂移进行平衡。
  11. 如权利要求9所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述四色平衡是指对白色进行匹配，同时对紫色、橙色和黄色漂移，或同时对紫色、橙色和青色漂移，或同时对紫色、黄色和青色漂移，或同时对橙色、黄色和青色漂移进行平衡。
  12. 如权利要求3所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述n值的取值条件为：n小于四色像素系统白平衡后的色度曲线中拐点所对应的灰阶值。
  13. 如权利要求6所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述n值的取值条件为：n小于四色像素系统白平衡后的色度曲线中拐点所对应的灰阶值。
  14. 如权利要求9所述的一种四色显示器白平衡过程中颜色漂移的调整方法，其中，所述n值的取值条件为：n小于四色像素系统白平衡后的色度曲线中拐点所对应的灰阶值。
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