WO2014121527A1 - 一种改善液晶屏的视角肤色色偏的方法及*** - Google Patents

一种改善液晶屏的视角肤色色偏的方法及*** Download PDF

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Publication number
WO2014121527A1
WO2014121527A1 PCT/CN2013/071668 CN2013071668W WO2014121527A1 WO 2014121527 A1 WO2014121527 A1 WO 2014121527A1 CN 2013071668 W CN2013071668 W CN 2013071668W WO 2014121527 A1 WO2014121527 A1 WO 2014121527A1
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Prior art keywords
white balance
balance voltage
blue
viewing angle
color shift
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PCT/CN2013/071668
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English (en)
French (fr)
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陈黎暄
康志聪
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深圳市华星光电技术有限公司
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Priority to US13/818,986 priority Critical patent/US20140218411A1/en
Publication of WO2014121527A1 publication Critical patent/WO2014121527A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
    • 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
    • G09G2320/06—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/068—Adjustment of display parameters for control of viewing angle adjustment

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a method and system for improving the color shift of a viewing angle of a liquid crystal panel.
  • the liquid crystal cell of the liquid crystal screen includes red, green and blue color films of different thicknesses, and the thickness of the blue color film is thicker than that of the red and green color films, so the thickness of the liquid crystal corresponding to the blue color film is redr than green.
  • the thickness of the liquid crystal corresponding to the color film is small.
  • This design results in a Z inversion of the blue tristimulus values. See Figure 1 for details.
  • Figure 1 is a plot of blue tristimulus values versus voltage, where Z is inverted at high pressure. This results in a color shift of the liquid crystal panel.
  • the technical problem to be solved by the present invention is to provide a method and system for improving the color shift of the color of the liquid crystal screen, so that the color of the liquid crystal screen is always within the specifications of the TV manufacturer.
  • a technical solution adopted by the present invention is to provide a method for improving the color shift of the viewing angle of the liquid crystal screen, the method comprising the steps of: obtaining a red color of a positive viewing angle of the skin color picture of the liquid crystal screen under the backlight, Green, blue, and white gamma curves; calculate an initial white balance voltage including a red white balance voltage, a green white balance voltage, and a blue white balance voltage, and adjust the skin color of the LCD according to the initial white balance voltage
  • the red, green, and blue gamma curves of the picture the gamma curves of the positive and oblique angles of the red, green, and blue colors adjusted by the LCD according to the initial white balance voltage; the gamma of the positive and oblique angles
  • the curve is compared with the 0-255 grayscale chromaticity to obtain the color shift result of the oblique view of the skin color picture of the liquid crystal screen; the red white balance voltage and the green white balance voltage are maintained unchanged, and
  • the partial pressure of the voltage in order to obtain a new white balance voltage; under the new white balance voltage, further obtain the skin color of the LCD screen
  • the color shift result of the oblique viewing angle of the surface and judge whether the color shift result deviates from the specification requirement; when the color shift result deviates from the specification requirement, the partial pressure specific gravity of the blue white balance voltage is changed again until the new white balance voltage is under the new white balance voltage.
  • the color shift value of the oblique view of the skin color screen of the LCD screen is always within the specification; wherein the specification requires the color difference specification of the positive viewing angle and the oblique viewing angle, and the color difference specification requires the value of the color shift value of the oblique viewing angle. Between (-0.03, +0.03).
  • the step of changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result further includes: if the color shift value of the oblique viewing angle is less than -0.03, the partial pressure specific gravity of the blue white balance voltage becomes larger; if the color shift value of the oblique viewing angle is When it is greater than +0.03, the partial pressure specific gravity of the blue white balance voltage becomes small.
  • the partial pressure range of the 255th gray scale of the blue white balance voltage is 4.5V-7.1V.
  • another technical solution adopted by the present invention is to provide a method for improving the color shift of the viewing angle of the liquid crystal screen, the method comprising the steps of: obtaining a red color of the positive viewing angle of the skin color picture of the liquid crystal screen under the backlight , green, blue and white gamma curve; calculate the initial white balance voltage, the initial white balance voltage includes red white balance voltage, green white balance voltage and blue white balance voltage, and adjust the liquid crystal screen of the liquid screen according to the initial white balance voltage Red, green, and blue gamma curves; obtain gamma curves of positive, oblique, and oblique viewing angles of red, green, and blue adjusted by the LCD according to the initial white balance voltage; gamma curves of positive and oblique viewing angles Comparing with 0-255 grayscale chromaticity to obtain the color shift result of the oblique view of the skin color picture of the liquid crystal screen; changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result, so that
  • the step of changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result, so that the color shift value of the oblique view angle of the liquid crystal screen of the liquid crystal screen is always within the specification requirement further includes: maintaining the red white balance voltage and the green white balance voltage Change, and change the partial pressure specific gravity of the blue white balance voltage according to the color shift result, thereby obtaining a new white balance voltage; under the new white balance voltage, further obtaining the color shift result of the oblique view of the skin color picture of the liquid crystal screen, And determine whether the color shift result deviates from the specification requirement; when the color shift result deviates from the specification requirement, the partial pressure specific gravity of the blue white balance voltage is changed again until the oblique angle of the liquid crystal screen of the liquid crystal screen is tested under the new white balance voltage.
  • the color cast value is always within specification.
  • the specification requirements are the color difference specification requirements of the positive viewing angle and the oblique viewing angle, and the color difference specification requires the value range between the (-0.03, +0.03) color shift values of the oblique viewing angle.
  • the step of changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result further includes: if the color shift value of the oblique viewing angle is less than -0.03, the partial pressure specific gravity of the blue white balance voltage becomes larger; if the color shift value of the oblique viewing angle is When it is greater than +0.03, the partial pressure specific gravity of the blue white balance voltage becomes small.
  • the partial pressure range of the 255th gray scale of the blue white balance voltage is 4.5V-7.1V.
  • another technical solution adopted by the present invention is to provide a system for improving the color shift of the viewing angle of the liquid crystal screen, the system comprising a gamma curve acquiring unit, an adjusting unit, a comparing unit, and a voltage dividing unit, wherein : the gamma curve acquisition unit acquires gamma curves of red, green, blue, and white of the positive angle of the skin color picture under backlight; the adjustment unit calculates an initial white balance voltage, and the initial white balance voltage includes a red white balance voltage, and a green white Balance voltage and blue white balance voltage, and adjust the red, green and blue gamma curves of the skin color picture of the liquid crystal according to the initial white balance voltage; the gamma curve acquisition unit acquires the skin color picture adjusted by the liquid screen according to the initial white balance voltage Red, green, and blue gamma curves for positive and oblique viewing angles; comparison unit compares gamma curves for positive and oblique viewing angles with 0-255 gray
  • the voltage dividing unit further comprises a red partial pressure unit, a green partial pressure unit and a blue partial pressure unit, wherein the red partial pressure unit and the green partial pressure unit maintain the red white balance voltage and the green white balance voltage respectively, blue
  • the voltage dividing unit changes the partial pressure specific gravity of the blue white balance voltage according to the specification, thereby obtaining a new white balance voltage; under the new white balance voltage, the comparison unit further obtains the color shift result of the oblique view of the skin color picture of the liquid crystal screen.
  • the blue voltage dividing unit again changes the partial pressure specific gravity of the blue white balance voltage until the new white balance voltage, the liquid crystal screen
  • the color cast value of the oblique view of the skin tone picture is always within specification.
  • the specification requirements are the color difference specification requirements of the positive viewing angle and the oblique viewing angle, and the color difference specification requires the value range between the (-0.03, +0.03) color shift values of the oblique viewing angle.
  • the blue voltage dividing unit changes the blue white balance voltage, so that the partial pressure specific gravity of the blue white balance voltage becomes larger; if the color shift value of the oblique viewing angle is greater than +0.03, the partial pressure The unit changes the blue white balance voltage so that the partial pressure specific gravity of the blue white balance voltage becomes small.
  • the partial pressure range of the 255th gray scale of the blue white balance voltage is 4.5V-7.1V.
  • the present invention compares the gamma curves of the red, green and blue positive and oblique angles of the traditional white balance with the 0-255 grayscale chromaticity, The color shift result of the oblique viewing angle of the skin color picture of the liquid crystal screen is obtained, and the partial pressure specific gravity of the blue white balance voltage is changed according to the color shift result, so that the color shift value of the oblique viewing angle of the skin color picture of the liquid crystal screen is always within the specification requirement.
  • the present invention makes the color tone of the liquid crystal screen always in the specification of the TV manufacturer.
  • Figure 1 is a graph of blue tristimulus values versus voltage
  • FIG. 2 is a flow chart of a method for improving a color shift of a view color of a liquid crystal panel according to an embodiment of the present invention
  • Figure 3 is a relationship diagram of color shift and viewing angle
  • Figure 4 is a diagram showing the relationship between the color shift and the voltage of the oblique viewing angle in the color difference specification
  • 5 is a flow chart showing specific steps of changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result
  • FIG. 6 is a schematic structural view of a system for improving the color shift of the viewing angle of the liquid crystal panel of the present invention.
  • FIG. 2 is a flow chart of a method for improving the color shift of the viewing angle of the liquid crystal panel of the present invention. As shown in FIG. 2, the method for improving the color tone of the liquid crystal screen of the present invention includes the following steps:
  • Step S1 Acquire a gamma curve of red, green, blue, and white of a positive viewing angle of the skin color picture of the liquid crystal screen under the backlight.
  • step S1 specifically, the luminance and chromaticity of the 0-255 gray scales of the red, green, blue, and white of the positive viewing angle of the skin color picture of the liquid crystal screen under the backlight are obtained, thereby obtaining a corresponding gamma curve.
  • the backlight in this embodiment is preferably Huaxing Optoelectronics (China) Star Optoelectronics Technology, CSOT) backlight, and the gamma value is preferably 2.2.
  • Step S2 calculating an initial white balance voltage, the initial white balance voltage including a red white balance voltage, a green white balance voltage, and a blue white balance voltage, and adjusting red, green, and blue gamma of the skin color picture of the liquid crystal according to the initial white balance voltage Horse curve.
  • step S2 white chromaticity x, y is first determined.
  • the partial pressure range of the 255th gray scale of the red white balance voltage, the green white balance voltage, and the blue white balance voltage in the initial white balance voltage is between 7.0V and 7.1V.
  • Step S3 Acquire a gamma curve of a positive viewing angle and a oblique viewing angle of red, green, and blue of the skin color picture adjusted according to the initial white balance voltage.
  • Step S4 Comparing the gamma curve of the positive viewing angle and the oblique viewing angle with the 0-255 grayscale chromaticity to obtain the color shifting result of the oblique viewing angle of the skin color picture of the liquid crystal screen.
  • step S4 the color shift result of the oblique view of the skin color picture of the liquid crystal screen adjusted according to the initial white balance voltage is specifically shown in FIG. 3, and FIG. 3 is a relationship diagram of color shift and viewing angle. As shown in FIG. 3, x1 and y1 are color shift results of the skin color picture of the liquid crystal screen after the initial white balance voltage adjustment.
  • Step S5 changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result, so that the color shift value of the oblique viewing angle of the skin color picture of the liquid crystal screen is always within the specification requirement.
  • step S5 the specifications of the present embodiment are required to be the color difference specification requirements of the positive viewing angle and the oblique viewing angle.
  • the range of values required by the color difference specification is between (-0.03, +0.03) of the color shift value of the oblique viewing angle.
  • FIG. 4 is a diagram showing the relationship between the color shift and the voltage of the oblique viewing angle in the color difference specification requirement, wherein the color shift value ( ⁇ x, ⁇ y) shown in FIG. 4 is at (-0.03, +0.03).
  • the range is within, the color shift of the oblique viewing angle of the skin color picture of the liquid crystal screen is not deviated from the preset specification; when the color shift value ( ⁇ x, ⁇ y) shown in FIG.
  • FIG. 5 is a flow chart showing the specific steps of changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result, as shown in FIG.
  • the change of the partial pressure of the blue white balance voltage specifically includes the following steps:
  • Step S51 maintaining the red white balance voltage and the green white balance voltage unchanged, and changing the partial pressure specific gravity of the blue white balance voltage according to the color shift result, thereby obtaining a new white balance voltage.
  • step S51 please refer to FIG. 4 again. If the color shift value of the oblique viewing angle is less than -0.03, the partial pressure specific gravity of the blue white balance voltage becomes larger; if the color shift value of the oblique viewing angle is greater than +0.03, then the blue The partial pressure specific gravity of the color white balance voltage becomes small.
  • the partial pressure range of the 255th gray scale of the blue white balance voltage is 4.5V-7.1V.
  • Step S52 further acquiring the color shift result of the oblique view of the skin color picture of the liquid crystal screen under the new white balance voltage, and determining whether the color shift result deviates from the specification requirement.
  • step S52 if the result of the determination is YES, the process proceeds to step S51, that is, the partial pressure specific gravity of the blue white balance voltage is again changed again, until the new white balance voltage, the oblique view of the skin color picture of the liquid crystal screen
  • the color shift value is always within the specifications shown in Figure 4.
  • the color shift result is as shown in FIG. 3, where x2 and y2 are color shift values after changing the blue white balance voltage. As can be seen from Figures 3 and 4, the higher blue white balance voltage has a smaller color shift.
  • step S53 If the result of the determination is no, the process goes to step S53.
  • FIG. 6 is a schematic structural diagram of a system for improving the color shift of the color of the liquid crystal screen according to the present invention.
  • the system 60 for improving the color tone of the liquid crystal screen of the present invention includes a gamma curve.
  • the gamma curve acquiring unit 61 acquires gamma curves of red, green, blue, and white of the positive viewing angle of the skin color picture of the liquid crystal screen under the backlight.
  • the gamma curve acquisition unit 61 acquires the luminance and chromaticity of the 0-255 gray scales of the red, green, blue, and white of the positive viewing angle of the skin color picture of the liquid crystal screen under the backlight, thereby obtaining the corresponding gamma. curve.
  • the backlight in this embodiment is preferably Huaxing Optoelectronics (China) Star Optoelectronics Technology, CSOT) backlight, and the gamma value is preferably 2.2.
  • the adjustment unit 62 calculates an initial white balance voltage including a red white balance voltage, a green white balance voltage, and a blue white balance voltage, and adjusts gamma curves of red, green, and blue of the liquid crystal panel according to the initial white balance voltage.
  • the adjustment unit 62 first determines the white chromaticity x, y.
  • the partial pressure range of the 255th gray scale of the red white balance voltage, the green white balance voltage, and the blue white balance voltage in the initial white balance voltage is between 7.0V and 7.1V.
  • the gamma curve acquisition unit 61 acquires a gamma curve of a positive viewing angle and a oblique viewing angle of red, green, and blue of the skin color picture adjusted by the liquid crystal screen according to the initial white balance voltage.
  • the comparing unit 63 compares the gamma curve of the positive viewing angle and the oblique viewing angle with the 0-255 grayscale chromaticity to obtain the color shifting result of the oblique viewing angle of the skin color picture of the liquid crystal panel.
  • the color shift result of the oblique viewing angle of the skin color picture of the liquid crystal panel adjusted according to the initial white balance voltage is the value of x1 and y1 of FIG. 3 .
  • the specifications of this embodiment are required to be the color difference specification requirements of the positive viewing angle and the oblique viewing angle.
  • the value range of the color difference specification is between (-0.03, +0.03) of the color shift value of the oblique viewing angle, as shown in FIG. 4 .
  • the comparison result obtained by the comparison unit 63 is that the color shift value ( ⁇ x, ⁇ y) of the oblique viewing angle shown in FIG. 4 is within the range of (-0.03, +0.03), the skin color picture of the liquid crystal screen is determined.
  • the color shift of the oblique viewing angle does not deviate from the preset specification.
  • the comparison unit 63 compares the result, the color shift value ( ⁇ x, ⁇ y) of the oblique viewing angle shown in FIG. 4 is out of the range of (-0.03, +0.03).
  • the color shift of the oblique viewing angle of the skin color picture of the liquid crystal screen is determined to deviate from the preset specification requirement.
  • the voltage dividing unit 64 changes the partial pressure specific gravity of the blue white balance voltage according to the color shift result, so that the color shift value of the oblique viewing angle of the skin color picture of the liquid crystal screen is always within the specification requirement.
  • the voltage dividing unit 64 includes a red voltage dividing unit 641, a green voltage dividing unit 642, and a blue voltage dividing unit 643.
  • the red voltage dividing unit 641 and the green voltage dividing unit 642 maintain the red white balance voltage and the green white balance voltage, respectively, and the blue voltage dividing unit 643 changes the partial pressure specific gravity of the blue white balance voltage according to the specification requirements. New white balance voltage.
  • the blue voltage dividing unit 643 changes the blue white balance voltage so that the partial pressure specific gravity of the blue white balance voltage becomes large.
  • the blue voltage dividing unit 643 changes the blue white balance voltage so that the partial pressure specific gravity of the blue white balance voltage becomes small.
  • the comparison unit 63 further acquires the color shift result of the oblique view of the skin color picture of the liquid crystal screen, and determines whether the color shift result deviates from the specification. If the color shift result deviates from the specification, the blue voltage dividing unit 643 again changes the partial pressure specific gravity of the blue white balance voltage until the color shift value of the oblique view of the liquid crystal screen of the liquid crystal screen is always at the new white balance voltage.
  • the partial pressure range of the 255th gray scale of the blue white balance voltage is between 4.5V and 7.1V.
  • the present invention compares the gamma curve of the red, green, and blue positive and oblique angles of the traditional white balance with the 0-255 grayscale chromaticity to obtain the oblique angle of the skin color picture of the liquid crystal screen.
  • the color shift result is changed, and the partial pressure specific gravity of the blue white balance voltage is changed according to the color shift result, so that the color shift value of the oblique viewing angle of the skin color picture of the liquid crystal screen is always within the specification requirement.
  • the present invention makes the color tone of the liquid crystal screen always in the specification of the TV manufacturer.

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Abstract

公开了一种改善液晶屏的视角肤色色偏的方法及***。该方法为：将初始自平衡电压调整后的红色、绿色和蓝色的正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，根据所述色偏结果变更所述蓝色白平衡电压的分压比重，使得所述液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。通过上述方式，本发明能够使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。

Description

一种改善液晶屏的视角肤色色偏的方法及***
【技术领域】
本发明涉及显示技术领域，特别是涉及一种改善液晶屏的视角肤色色偏的方法及***。
【背景技术】
目前，液晶屏的液晶盒包括不同厚度的红色、绿色和蓝色的彩膜，并且蓝色彩膜的厚度要厚于红色和绿色的彩膜，因此蓝色彩膜对应的液晶的厚度比红色和绿色彩膜对应的液晶的厚度小。此设计导致了蓝色的三刺激值中Z反转，具体请参阅图1，图1是蓝色的三刺激值与电压的关系图，其中，Z在高压下存在反转。这导致了液晶屏的色偏。
目前，电视厂商常以液晶屏的斜视角的色度相较于正视角的色度和白点视角的色度的偏离来评估液晶屏视角（LCD View Angle）质量的好坏。而在液晶模组的设计中，中小尺寸产品通常并未采用低色偏（Low Color Shift）设计，从而液晶屏的斜视角色偏测试结果通常超出电视厂商的规格。
【发明内容】
本发明主要解决的技术问题是提供一种改善液晶屏的视角肤色色偏的方法及***，使得液晶屏的视角肤色色偏始终处于电视厂商的规格要求内。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种改善液晶屏的视角肤色色偏的方法，该方法包括以下步骤：获取液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线；计算初始白平衡电压，初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据初始白平衡电压调整所述液晶屏的肤色画面的红色、绿色和蓝色的伽马曲线；获取液晶屏根据初始白平衡电压调整后的红色、绿色和蓝色的正视角和斜视角的伽马曲线；将正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，以得到液晶屏的肤色画面的斜视角的色偏结果；维持红色白平衡电压和绿色白平衡电压不变，并根据色偏结果相应变更蓝色白平衡电压的分压比重，以此得到新的白平衡电压；在新的白平衡电压下，进一步获取液晶屏的肤色画面的斜视角的色偏结果，并判断色偏结果是否偏离规格要求；当色偏结果偏离规格要求时，则再次重新变更蓝色白平衡电压的分压比重，直至在新的白平衡电压下，液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内；其中，规格要求为正视角和斜视角的颜色差异规格要求，并且颜色差异规格要求的取值为斜视角的色偏值的（-0.03，+0.03）之间。
其中，根据色偏结果变更蓝色白平衡电压的分压比重的步骤进一步包括：若斜视角的色偏值小于-0.03时，蓝色白平衡电压的分压比重变大；若斜视角的色偏值大于+0.03时，蓝色白平衡电压的分压比重变小。
其中，蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种改善液晶屏的视角肤色色偏的方法，该方法包括以下步骤：获取液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线；计算初始白平衡电压，初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据初始白平衡电压调整液晶屏的肤色画面的红色、绿色和蓝色的伽马曲线；获取液晶屏根据初始白平衡电压调整后的红色、绿色和蓝色的正视角和斜视角的伽马曲线；将正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，以得到液晶屏的肤色画面的斜视角的色偏结果；根据色偏结果变更蓝色白平衡电压的分压比重，使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
其中，根据色偏结果变更蓝色白平衡电压的分压比重，使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内的步骤进一步包括：维持红色白平衡电压和绿色白平衡电压不变，并根据色偏结果相应变更蓝色白平衡电压的分压比重，以此得到新的白平衡电压；在新的白平衡电压下，进一步获取液晶屏的肤色画面的斜视角的色偏结果，并判断色偏结果是否偏离规格要求；当色偏结果偏离规格要求时，则再次重新变更蓝色白平衡电压的分压比重，直至在新的白平衡电压下，测试液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
其中，规格要求为正视角和斜视角的颜色差异规格要求，并且颜色差异规格要求的取值范围为斜视角的色偏值的（-0.03，+0.03）之间。
其中，根据色偏结果变更蓝色白平衡电压的分压比重的步骤进一步包括：若斜视角的色偏值小于-0.03时，蓝色白平衡电压的分压比重变大；若斜视角的色偏值大于+0.03时，蓝色白平衡电压的分压比重变小。
其中，蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V。
为解决上述技术问题，本发明采用的又一个技术方案是：提供一种改善液晶屏的视角肤色色偏的***，该***包括伽马曲线获取单元、调整单元、比较单元以及分压单元，其中：伽马曲线获取单元获取在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线；调整单元计算初始白平衡电压，初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据初始白平衡电压调整液晶屏的肤色画面的红色、绿色和蓝色的伽马曲线；伽马曲线获取单元获取液晶屏根据初始白平衡电压调整后肤色画面的红色、绿色和蓝色的正视角和斜视角的伽马曲线；比较单元将正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，以得到液晶屏的肤色画面的斜视角的色偏结果；分压单元根据色偏结果变更蓝色白平衡电压的分压比重，使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
其中，分压单元进一步包括红色分压单元，绿色分压单元和蓝色分压单元，其中，红色分压单元和绿色分压单元分别维持红色白平衡电压和绿色白平衡电压不变，蓝色分压单元根据规格要求相应变更蓝色白平衡电压的分压比重，以此得到新的白平衡电压；在新的白平衡电压下，比较单元进一步获取液晶屏的肤色画面的斜视角的色偏结果，并判断色偏结果是否偏离规格要求；当色偏结果偏离规格要求时，则蓝色分压单元再次重新变更蓝色白平衡电压的分压比重，直至在新的白平衡电压下，液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
其中，规格要求为正视角和斜视角的颜色差异规格要求，并且颜色差异规格要求的取值范围为斜视角的色偏值的（-0.03，+0.03）之间。
其中，斜视角的色偏值小于-0.03时，蓝色分压单元变更蓝色白平衡电压，使得蓝色白平衡电压的分压比重变大；若斜视角的色偏值大于+0.03时，分压单元变更蓝色白平衡电压，使得蓝色白平衡电压的分压比重变小。
其中，蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V。
本发明的有益效果是：区别于现有技术的情况，本发明将传统白平衡下的红色、绿色和蓝色的正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，以得到液晶屏的肤色画面的斜视角的色偏结果，并根据色偏结果变更蓝色白平衡电压的分压比重，使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。通过上述方式，本发明使得液晶屏的视角肤色色偏始终处于电视厂商的规格要求内。
【附图说明】
图1是蓝色的三刺激值与电压的关系图；
图2是本发明实施例的一种改善液晶屏的视角肤色色偏的方法的流程图；
图3是色偏与视角的关系图；
图4是颜色差异规格要求中的斜视角的色偏和电压的关系图；
图5是根据色偏结果变更蓝色白平衡电压的分压比重的具体步骤的流程图；
图6是本发明一种改善液晶屏的视角肤色色偏的***的结构示意图。
【具体实施方式】
请参阅图2，图2是本发明的一种改善液晶屏的视角肤色色偏的方法的流程图。如图2所示，本发明改善液晶屏的视角肤色色偏的方法包括以下步骤：
步骤S1：获取液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线。
在步骤S1中，具体为获取液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的0-255灰阶的亮度和色度，以此得到相应的伽马曲线。其中，本实施例中的背光优选为华星光电（China Star Optoelectronics Technology，CSOT）背光，并且伽马值优选取2.2。
步骤S2：计算初始白平衡电压，初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据初始白平衡电压调整液晶屏的肤色画面的红色、绿色和蓝色的伽马曲线。
在步骤S2中，首先确定白色色度x，y。通常在CSOT背光下，液晶屏的白色色度为x=0.28，y=0.29。因此将每一灰阶的白色色度设计在此值附近，并将伽马曲线的值保持在2.2附近。本实施例中，初始白平衡电压中的红色白平衡电压、绿色白平衡电压和蓝色白平衡电压的第255灰阶的分压范围均在7.0V-7.1V之间。
步骤S3：获取液晶屏根据初始白平衡电压调整后的肤色画面的红色、绿色和蓝色的正视角和斜视角的伽马曲线。
步骤S4：将正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，以得到液晶屏的肤色画面的斜视角的色偏结果。
在步骤S4中，根据初始白平衡电压调整后的液晶屏的肤色画面的斜视角的色偏结果具体请参阅图3，图3是色偏与视角的关系图。如图3所示，x1和y1为初始白平衡电压调整后的液晶屏的肤色画面的色偏结果。
步骤S5：根据色偏结果变更蓝色白平衡电压的分压比重，使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
在步骤S5中，本实施例的规格要求为正视角和斜视角的颜色差异规格要求。并且该颜色差异规格要求的取值范围为斜视角的色偏值的（-0.03，+0.03）之间。具体请参阅图4，图4是颜色差异规格要求中的斜视角的色偏和电压的关系图，其中，当图4所示的色偏值（Δx，Δy）在（-0.03，+0.03）的范围内时，判断液晶屏的肤色画面的斜视角的色偏没有偏离预设的规格要求；当图4所示的色偏值（Δx，Δy）超出（-0.03，+0.03）的范围内时，判断液晶屏的肤色画面的斜视角的色偏偏离预设的规格要求，则需要变更蓝色白平衡电压的分压比重。其中，变更蓝色白平衡电的压分压比重的具体步骤请参阅图5所示，图5是根据色偏结果变更蓝色白平衡电压的分压比重的具体步骤的流程图，如图5所示，变更蓝色白平衡电压的分压比重具体包括以下步骤：
步骤S51：维持红色白平衡电压和绿色白平衡电压不变，并根据色偏结果相应变更蓝色白平衡电压的分压比重，以此得到新的白平衡电压。
在步骤S51中，具体请再参阅图4，若斜视角的色偏值小于-0.03时，则蓝色白平衡电压的分压比重变大；若斜视角的色偏值大于+0.03时，则蓝色白平衡电压的分压比重变小。其中，本实施例中，蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V。
步骤S52：在新的白平衡电压下，进一步获取液晶屏的肤色画面的斜视角的色偏结果，并判断色偏结果是否偏离规格要求。
在步骤S52中，如果判断的结果为是时，跳转到步骤S51，即再次重新变更蓝色白平衡电压的分压比重，直至在新的白平衡电压下，液晶屏的肤色画面的斜视角的色偏值始终处于图4所示的规格要求以内。本实施例中，根据图4所示的规格要求变更蓝色白平衡电压后，其色偏结果如图3所示，其中x2和y2是变更蓝色白平衡电压后的色偏值。由图3和图4可知，较高的蓝色白平衡电压其色偏更小。
如果判断的结果为否时，跳转到步骤S53。
步骤S53：结束。
请参阅图6，图6是本发明一种改善液晶屏的视角肤色色偏的***的结构示意图，如图6所示，本发明的改善液晶屏的视角肤色色偏的***60包括伽马曲线获取单元61、调整单元62、比较单元63以及分压单元64。
其中，伽马曲线获取单元61获取液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线。
具体而言，伽马曲线获取单元61获取液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的0-255灰阶的亮度和色度，以此得到相应的伽马曲线。其中，本实施例中的背光优选为华星光电（China Star Optoelectronics Technology，CSOT）背光，并且伽马值优选取2.2。
调整单元62计算初始白平衡电压，初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据初始白平衡电压调整液晶屏的红色、绿色和蓝色的伽马曲线。
具体而言，调整单元62首先确定白色色度x，y。通常在CSOT背光下，液晶屏的白色色度为x=0.28，y=0.29。因此将每一灰阶的白色色度设计在此值附近，并将伽马曲线的值保持在2.2附近。本实施例中，初始白平衡电压中的红色白平衡电压、绿色白平衡电压和蓝色白平衡电压的第255灰阶的分压范围均在7.0V-7.1V之间。
伽马曲线获取单元61获取液晶屏根据初始白平衡电压调整后的肤色画面的红色、绿色和蓝色的正视角和斜视角的伽马曲线。比较单元63将正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，以得到液晶屏的肤色画面的斜视角的色偏结果。
其中，根据初始白平衡电压调整后的液晶屏的肤色画面的斜视角的色偏结果为图3的x1和y1的值。本实施例的规格要求为正视角和斜视角的颜色差异规格要求。并且该颜色差异规格要求的取值范围为斜视角的色偏值的（-0.03，+0.03）之间，具体如图4所示。
本实施例中，如果比较单元63比较得到的结果为图4所示的斜视角的色偏值（Δx，Δy）在（-0.03，+0.03）的范围内时，则判断液晶屏的肤色画面的斜视角的色偏没有偏离预设的规格要求，如果比较单元63比较得到的结果为图4所示的斜视角的色偏值（Δx，Δy）超出（-0.03，+0.03）的范围内时，则判断液晶屏的肤色画面的斜视角的色偏偏离预设的规格要求。
分压单元64根据色偏结果变更蓝色白平衡电压的分压比重，使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。具体而言，分压单元64包括红色分压单元641，绿色分压单元642和蓝色分压单元643。其中，红色分压单元641和绿色分压单元642分别维持红色白平衡电压和绿色白平衡电压不变，蓝色分压单元643根据规格要求相应变更蓝色白平衡电压的分压比重，以此得到新的白平衡电压。具体而言，当斜视角的色偏值小于-0.03时，蓝色分压单元643变更蓝色白平衡电压，使得蓝色白平衡电压的分压比重变大。当斜视角的色偏值大于+0.03时，蓝色分压单元643变更蓝色白平衡电压，使得蓝色白平衡电压的分压比重变小。
在新的白平衡电压下，比较单元63进一步获取液晶屏的肤色画面的斜视角的色偏结果，并判断色偏结果是否偏离规格要求。如果色偏结果偏离规格要求时，则蓝色分压单元643再次重新变更蓝色白平衡电压的分压比重，直至在新的白平衡电压下，液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
本实施例中，变更蓝色白平衡电压时，蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V之间。
综上所述，本发明将传统白平衡下的红色、绿色和蓝色的正视角和斜视角的伽马曲线和0-255灰阶色度进行比较，以得到液晶屏的肤色画面的斜视角的色偏结果，并根据色偏结果变更蓝色白平衡电压的分压比重，使得液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。通过上述方式，本发明使得液晶屏的视角肤色色偏始终处于电视厂商的规格要求内。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (13)

  1. 一种改善液晶屏的视角肤色色偏的方法，其中，所述方法包括以下步骤：
    获取所述液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线；
    计算初始白平衡电压，所述初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据所述初始白平衡电压调整所述液晶屏的肤色画面的红色、绿色和蓝色的伽马曲线；
    获取所述液晶屏根据所述初始白平衡电压调整后的肤色画面的所述红色、绿色和蓝色的正视角和斜视角的伽马曲线；
    将所述正视角和所述斜视角的伽马曲线和0-255灰阶色度进行比较，以得到所述液晶屏的肤色画面的斜视角的色偏结果；
    维持所述红色白平衡电压和所述绿色白平衡电压不变，并根据所述色偏结果相应变更所述蓝色白平衡电压的分压比重，以此得到新的白平衡电压；
    在所述新的白平衡电压下，进一步获取所述液晶屏的肤色画面的斜视角的色偏结果，并判断所述色偏结果是否偏离所述规格要求；
    当所述色偏结果偏离所述规格要求时，则再次重新变更所述蓝色白平衡电压的分压比重，直至在所述新的白平衡电压下，所述液晶屏的肤色画面的斜视角的色偏值始终处于所述规格要求以内；
    其中，所述规格要求为所述正视角和所述斜视角的颜色差异规格要求，并且所述颜色差异规格要求的取值为所述斜视角的色偏值的（-0.03，+0.03）之间。
  2. 根据权利要求1所述的方法，其中，所述根据所述色偏结果变更所述蓝色白平衡电压的分压比重的步骤进一步包括：
    若所述斜视角的色偏值小于-0.03时，所述蓝色白平衡电压的分压比重变大；
    若所述斜视角的色偏值大于+0.03时，所述蓝色白平衡电压的分压比重变小。
  3. 根据权利要求1所述的方法，其中，所述蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V。
  4. 一种改善液晶屏的视角肤色色偏的方法，其中，所述方法包括以下步骤：
    获取所述液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线；
    计算初始白平衡电压，所述初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据所述初始白平衡电压调整所述液晶屏的肤色画面的红色、绿色和蓝色的伽马曲线；
    获取所述液晶屏根据所述初始白平衡电压调整后的肤色画面的所述红色、绿色和蓝色的正视角和斜视角的伽马曲线；
    将所述正视角和所述斜视角的伽马曲线和0-255灰阶色度进行比较，以得到所述液晶屏的肤色画面的斜视角的色偏结果；
    根据所述色偏结果变更所述蓝色白平衡电压的分压比重，使得所述液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
  5. 根据权利要求4所述的方法，其中，所述根据所述色偏结果变更所述蓝色白平衡电压的分压比重，使得所述液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内的步骤进一步包括：
    维持所述红色白平衡电压和所述绿色白平衡电压不变，并根据所述色偏结果相应变更所述蓝色白平衡电压的分压比重，以此得到新的白平衡电压；
    在所述新的白平衡电压下，进一步获取所述液晶屏的肤色画面的斜视角的色偏结果，并判断所述色偏结果是否偏离所述规格要求；
    当所述色偏结果偏离所述规格要求时，则再次重新变更所述蓝色白平衡电压的分压比重，直至在所述新的白平衡电压下，所述液晶屏的肤色画面的斜视角的色偏值始终处于所述规格要求以内。
  6. 根据权利要求4所述的方法，其中，所述规格要求为所述正视角和所述斜视角的颜色差异规格要求，并且所述颜色差异规格要求的取值为所述斜视角的色偏值的（-0.03，+0.03）之间。
  7. 根据权利要求6所述的方法，其中，所述根据所述色偏结果变更所述蓝色白平衡电压的分压比重的步骤进一步包括：
    若所述斜视角的色偏值小于-0.03时，所述蓝色白平衡电压的分压比重变大；
    若所述斜视角的色偏值大于+0.03时，所述蓝色白平衡电压的分压比重变小。
  8. 根据权利要求4所述的方法，其中，所述蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V。
  9. 一种改善液晶屏的视角肤色色偏的***，其中，所述***包括伽马曲线获取单元、调整单元、比较单元以及分压单元，其中：
    所述伽马曲线获取单元获取所述液晶屏在背光下的肤色画面的正视角的红色、绿色、蓝色和白色的伽马曲线；
    所述调整单元计算初始白平衡电压，所述初始白平衡电压包括红色白平衡电压、绿色白平衡电压和蓝色白平衡电压，并根据所述初始白平衡电压调整所述液晶屏的肤色画面的红色、绿色和蓝色的伽马曲线；
    所述伽马曲线获取单元获取所述液晶屏根据所述初始白平衡电压调整后的肤色画面的所述红色、绿色和蓝色的正视角和斜视角的伽马曲线；
    所述比较单元将所述正视角和所述斜视角的伽马曲线和0-255灰阶色度进行比较，以得到所述液晶屏的肤色画面的斜视角的色偏结果；
    所述分压单元根据所述色偏结果变更所述蓝色白平衡电压的分压比重，使得所述液晶屏的肤色画面的斜视角的色偏值始终处于规格要求以内。
  10. 根据权利要求9所述的***，其中，所述分压单元进一步包括红色分压单元，绿色分压单元和蓝色分压单元，其中，所述红色分压单元和所述绿色分压单元分别维持所述红色白平衡电压和所述绿色白平衡电压不变，所述蓝色分压单元根据所述规格要求相应变更所述蓝色白平衡电压的分压比重，以此得到新的白平衡电压；
    在所述新的白平衡电压下，所述比较单元进一步获取所述液晶屏的肤色画面的斜视角的色偏结果，并判断所述色偏结果是否偏离所述规格要求；
    当所述色偏结果偏离所述规格要求时，则所述蓝色分压单元再次重新变更所述蓝色白平衡电压的分压比重，直至在所述新的白平衡电压下，所述液晶屏的肤色画面的斜视角的色偏值始终处于所述规格要求以内。
  11. 根据权利要求9所述的***，其中，所述规格要求为所述正视角和所述斜视角的颜色差异规格要求，并且所述颜色差异规格要求的取值范围为所述斜视角的色偏值的（-0.03，+0.03）之间。
  12. 根据权利要求11所述的***，其中，若所述斜视角的色偏值小于-0.03时，所述蓝色分压单元变更所述蓝色白平衡电压，使得所述蓝色白平衡电压的分压比重变大；
    若所述斜视角的色偏值大于+0.03时，所述蓝色分压单元变更所述蓝色白平衡电压，使得所述蓝色白平衡电压的分压比重变小。
  13. 根据权利要求9所述的***，其中，所述蓝色白平衡电压的第255灰阶的分压范围为4.5V-7.1V。
PCT/CN2013/071668 2013-02-05 2013-02-19 一种改善液晶屏的视角肤色色偏的方法及*** WO2014121527A1 (zh)

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