WO2018176523A1 - Rgbw液晶显示装置的亮度调节方法及装置 - Google Patents

Rgbw液晶显示装置的亮度调节方法及装置 Download PDF

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WO2018176523A1
WO2018176523A1 PCT/CN2017/081031 CN2017081031W WO2018176523A1 WO 2018176523 A1 WO2018176523 A1 WO 2018176523A1 CN 2017081031 W CN2017081031 W CN 2017081031W WO 2018176523 A1 WO2018176523 A1 WO 2018176523A1
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brightness
grayscale
value
preset
liquid crystal
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PCT/CN2017/081031
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English (en)
French (fr)
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查国伟
崔宏青
魏起
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武汉华星光电技术有限公司
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Priority to US15/534,000 priority Critical patent/US10134345B1/en
Publication of WO2018176523A1 publication Critical patent/WO2018176523A1/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
    • 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
    • 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
    • G09G3/3406—Control of illumination source
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a method and an apparatus for adjusting brightness of an RGBW liquid crystal display device.
  • LCDs liquid crystal displays
  • Various consumer electronic products such as digital assistants, digital cameras, notebook computers, and desktop computers have become mainstream in display devices.
  • a conventional liquid crystal display generally includes a plurality of pixel units arranged in an array, each of which further includes red sub-pixels, green sub-pixels, and blue sub-pixels arranged in sequence, and the liquid crystal display of the three-color pixel unit is brightness
  • a red, green, blue and white (RGBW) four-color display device is added, which is to add white sub-pixels in a conventional red, green and blue (RGB) three-color display device, and the white sub-pixels are highly transparent.
  • the formation of organic materials with excessive rate can greatly improve the brightness and transmittance of the liquid crystal display.
  • the maximum brightness of the current RGB three-color display device is usually at the level of 400-500 nits, and the maximum brightness of the RGBW four-color display device can be achieved. 700-1200nits or so.
  • the human eye has different recognition abilities for different brightnesses.
  • the human eye can recognize a very small difference in brightness, and in the higher brightness interval, the human eye can specifically identify the difference in brightness.
  • the difference therefore, for a display device with a higher maximum brightness value, if the electro-optical characteristic curve of the conventional cathode ray tube display is continued, the brightness recognition of the highlighted area of the human eye is affected, and high dynamic range (high dynamic range) cannot be exhibited. HDR) quality images.
  • a new electro-optical transfer function (EOTF) is proposed in the prior art, which uses a 10-bit degree encoding to a maximum brightness of 10000 nits, and can present a high-quality image with high dynamic contrast, but
  • the liquid crystal display is a passive light-emitting device.
  • the brightness and darkness of the gray scale need to be controlled by the combination of the birefringence effect of the liquid crystal molecules and the polarization characteristics of the polarizer.
  • the birefringence effect and the polarization characteristics of the polarizer are often non-ideal, and thus the active light is emitted.
  • liquid crystal display usually shows up in dark state Not ideal enough, so the specific operation of the above new EOTF in the low-brightness range can not be fully utilized, and it is usually applied to the dark environment compared with the TV product.
  • the mobile smart device is usually applied in the daily indoor environment and the outdoor environment. It has a large ambient light brightness, so the display of the mobile smart device does not have practical application value when the gray scale is divided in the dark portion, so the brightness adjustment of the new RGBW liquid crystal display device is required.
  • the method and the device take into consideration the poor dark state characteristics of the liquid crystal display itself and the high brightness value of the RGBW liquid crystal display, and improve the detail rendering capability of the RGBW liquid crystal display in the high gray level picture.
  • An object of the present invention is to provide a brightness adjustment method for an RGBW liquid crystal display device, which can balance the poor dark state characteristics of the liquid crystal display device itself and the high maximum brightness value of the RGBW liquid crystal display device, and improve the RGBW liquid crystal display device in a high gray level. The detail of the picture is presented.
  • Another object of the present invention is to provide a brightness adjusting device for an RGBW liquid crystal display device, which can balance the poor dark state characteristics of the liquid crystal display device itself and the higher maximum brightness value of the RGBW liquid crystal display device, and improve the RGBW liquid crystal display device in high gray.
  • the detail rendering ability of the picture is to provide a brightness adjusting device for an RGBW liquid crystal display device, which can balance the poor dark state characteristics of the liquid crystal display device itself and the higher maximum brightness value of the RGBW liquid crystal display device, and improve the RGBW liquid crystal display device in high gray.
  • the present invention provides a brightness adjustment method for an RGBW liquid crystal display device, comprising the following steps:
  • Step 1 providing an RGBW liquid crystal display device, acquiring a maximum brightness value of the RGBW liquid crystal display device, a preset first brightness threshold, a preset second brightness threshold, and a preset gamma value, the second The brightness threshold is greater than the first brightness threshold;
  • Step 2 Calculate a grayscale value corresponding to the first brightness threshold according to a preset first brightness threshold, a preset gamma value, and a preset first electro-optical conversion function, and define the grayscale value as a grayscale Threshold value
  • Step 3 generating, according to a maximum brightness value of the RGBW liquid crystal display device, a grayscale threshold calculated in step 2, a preset first electro-optical conversion function, and a preset second electro-optic conversion function, generating the RGBW liquid crystal display device Gray scale brightness lookup table;
  • the relationship between grayscale and luminance in the grayscale luminance lookup table corresponds to the first electro-optical conversion function; in the grayscale interval of the grayscale threshold to 255 grayscale And the relationship between the gray scale and the brightness in the gray scale brightness lookup table corresponds to the second electro-optical conversion function;
  • the slope of the curve of the second electro-optical conversion function is greater than the slope of the curve of the first electro-optic conversion function in a range from the second brightness threshold to the maximum brightness value;
  • Step 4 Adjust the brightness of the RGBW liquid crystal display device according to the gray scale brightness lookup table generated in the step 3.
  • the first electro-optic conversion function is a standard gamma curve function of a preset gamma value:
  • Lum Lmax ⁇ (G/255) gamma ;
  • G is an 8-bit encoded grayscale value
  • Lum is a luminance value corresponding to the grayscale value
  • Lmax is a maximum luminance value of the RGBW liquid crystal display device
  • gamma is a preset gamma value.
  • the second electro-optical conversion function is:
  • the preset gray scale compression formula is:
  • Gt is a grayscale threshold calculated in step 2
  • gray1 is a 10-bit code corresponding to the first luminance threshold calculated according to a preset first luminance threshold and a preset 10-bit luminance grayscale conversion formula.
  • Grayscale value is a 10-bit encoded grayscale value corresponding to the maximum luminance value calculated according to the maximum luminance value and the preset 10-bit luminance grayscale conversion formula, and the grayx ranges from gray1 to gray2;
  • the 10-bit luminance gray scale conversion formula is:
  • L is the luminance value
  • gray is the grayscale value of the 10-bit encoding corresponding to the luminance value
  • the preset gamma value ranges from 1.8 to 2.4.
  • step 3 an interpolation method is used to generate a gray scale brightness lookup table of the RGBW liquid crystal display device.
  • the present invention also provides a brightness adjustment device for an RGBW liquid crystal display device, comprising: a parameter acquisition module, a grayscale threshold calculation module associated with the parameter acquisition module, and a search associated with the parameter acquisition module and a grayscale threshold calculation module a table generation module, a brightness adjustment module associated with the lookup table generation module;
  • the parameter obtaining module is configured to acquire a maximum brightness value, a preset first brightness threshold, a preset second brightness threshold, and a preset gamma value of the RGBW liquid crystal display device, where the second brightness threshold is greater than First brightness threshold;
  • the grayscale threshold calculation module is configured to use a preset first brightness threshold, a preset gamma value, And a preset first electro-optic conversion function, calculating a grayscale value corresponding to the first brightness threshold, and defining the grayscale value as a grayscale threshold;
  • the lookup table generating module is configured to generate a gray of the RGBW liquid crystal display device according to a maximum brightness value, a grayscale threshold, a preset first electro-optical conversion function, and a preset second electro-optical conversion function of the RGBW liquid crystal display device
  • the order brightness lookup table is such that the gray scale and brightness relationship in the gray scale luminance lookup table corresponds to the first electro-optic conversion function in the gray scale interval of the 0 gray scale to the gray scale threshold; the gray scale threshold is 255 gray In the gray level interval of the order, the relationship between the gray level and the brightness in the gray level brightness lookup table corresponds to the second electro-optical conversion function;
  • the slope of the curve of the second electro-optical conversion function is greater than the slope of the curve of the first electro-optic conversion function in a range from the second brightness threshold to the maximum brightness value;
  • the brightness adjustment module is configured to adjust brightness of the RGBW liquid crystal display device according to a gray scale brightness lookup table generated by the lookup table generation module.
  • the first electro-optic conversion function is a standard gamma curve function of a preset gamma value:
  • Lum Lmax ⁇ (G/255) gamma ;
  • G is an 8-bit encoded grayscale value
  • Lum is a luminance value corresponding to the grayscale value
  • Lmax is a maximum luminance value of the RGBW liquid crystal display device
  • gamma is a preset gamma value.
  • the second electro-optical conversion function is:
  • the preset gray scale compression formula is:
  • Gt is a grayscale threshold
  • gray1 is a grayscale value of a 10-bit code corresponding to the first brightness threshold calculated according to a preset first brightness threshold and a preset 10-bit brightness grayscale conversion formula
  • gray2 is The grayscale value of the 10-bit code corresponding to the maximum brightness value calculated according to the maximum brightness value and the preset 10-bit brightness gray scale conversion formula, the grayx value range is gray1 to gray2;
  • the 10-bit luminance gray scale conversion formula is:
  • L is the luminance value
  • gray is the grayscale value of the 10-bit encoding corresponding to the luminance value
  • the preset gamma value ranges from 1.8 to 2.4.
  • the lookup table generating module generates an gray scale brightness lookup table of the RGBW liquid crystal display device by using an interpolation method.
  • the invention also provides a brightness adjustment method for an RGBW liquid crystal display device, comprising the following steps:
  • Step 1 providing an RGBW liquid crystal display device, acquiring a maximum brightness value of the RGBW liquid crystal display device, a preset first brightness threshold, a preset second brightness threshold, and a preset gamma value, the second The brightness threshold is greater than the first brightness threshold;
  • Step 2 Calculate a grayscale value corresponding to the first brightness threshold according to a preset first brightness threshold, a preset gamma value, and a preset first electro-optical conversion function, and define the grayscale value as a grayscale Threshold value
  • Step 3 generating, according to a maximum brightness value of the RGBW liquid crystal display device, a grayscale threshold calculated in step 2, a preset first electro-optical conversion function, and a preset second electro-optic conversion function, generating the RGBW liquid crystal display device Gray scale brightness lookup table;
  • the relationship between grayscale and luminance in the grayscale luminance lookup table corresponds to the first electro-optical conversion function; in the grayscale interval of the grayscale threshold to 255 grayscale And the relationship between the gray scale and the brightness in the gray scale brightness lookup table corresponds to the second electro-optical conversion function;
  • the slope of the curve of the second electro-optical conversion function is greater than the slope of the curve of the first electro-optic conversion function in a range from the second brightness threshold to the maximum brightness value;
  • Step 4 adjusting brightness of the RGBW liquid crystal display device according to the gray scale brightness lookup table generated in the step 3;
  • the preset gamma value ranges from 1.8 to 2.4;
  • step 3 an interpolation method is used to generate a grayscale brightness lookup table of the RGBW liquid crystal display device.
  • the present invention provides a brightness adjustment method for an RGBW liquid crystal display device, which first calculates according to a preset first brightness threshold, a preset gamma value, and a preset first electro-optical conversion function. Obtaining a grayscale value corresponding to the first brightness threshold, defining the grayscale value as a grayscale threshold, and further, according to the maximum brightness value, the grayscale threshold, the preset first electro-optical conversion function, and the preset of the RGBW liquid crystal display device a second electro-optical conversion function generates a grayscale luminance lookup table of the RGBW liquid crystal display device, and causes a relationship between grayscale and luminance of the grayscale luminance lookup table in a low grayscale interval of 0 grayscale to grayscale threshold
  • the standard gamma curve function of the preset gamma value corresponds to the first electro-optical conversion function, and the relationship between the gray scale and the brightness corresponds to the second electro-optical conversion function in the high gray scale interval of the gray scale
  • the invention provides a brightness adjusting device for an RGBW liquid crystal display device, which can balance the poor dark state characteristics of the liquid crystal display device itself and the high maximum brightness value of the RGBW liquid crystal display device, and improve the RGBW liquid crystal display device in a high gray scale image. Detail presentation capabilities.
  • FIG. 1 is a comparison diagram of a change curve of gray scale and brightness in a brightness adjustment method of an RGBW liquid crystal display device of the present invention and a change curve of gray scale and brightness in the conventional liquid crystal display device;
  • FIG. 2 is a block diagram of a brightness adjusting device of an RGBW liquid crystal display device of the present invention
  • FIG. 3 is a flow chart of a method of adjusting brightness of an RGBW liquid crystal display device of the present invention.
  • the present invention provides a brightness adjustment method for an RGBW liquid crystal display device, including the following steps:
  • Step 1 providing an RGBW liquid crystal display device, acquiring a maximum brightness value of the RGBW liquid crystal display device, a preset first brightness threshold, a preset second brightness threshold, and a preset gamma value, the second The brightness threshold is greater than the first brightness threshold.
  • the preset gamma value ranges from 1.8 to 2.4
  • the first brightness threshold and the second brightness threshold may be selected according to the maximum brightness value according to an actual situation
  • the RGBW liquid crystal display device adopts 8
  • the gray level of the bit code that is, 0 gray scale to 255 gray scale.
  • the maximum brightness value of the provided RGBW liquid crystal display device is 1000 nits
  • the preset first brightness threshold is 100 nits
  • the preset second brightness threshold is 700 nits
  • the preset gamma The value is 2.2.
  • Step 2 Calculate a grayscale value corresponding to the first brightness threshold according to a preset gamma value of the first brightness threshold and a preset first electro-optical conversion function, and define the grayscale value as a grayscale threshold. value.
  • G is an 8-bit encoded grayscale value
  • Lum is a luminance value corresponding to the grayscale value
  • Lmax is a maximum luminance value of the RGBW liquid crystal display device
  • gamma is a preset gamma value.
  • the step 2 calculates a grayscale threshold according to a standard gamma curve function of a preset gamma value.
  • the grayscale threshold is equal to 255 ⁇ (100/1000) 1/2.2 , that is, 90 grayscale. .
  • Step 3 generating, according to a maximum brightness value of the RGBW liquid crystal display device, a grayscale threshold calculated in step 2, a preset first electro-optical conversion function, and a preset second electro-optic conversion function, generating the RGBW liquid crystal display device Gray scale brightness lookup table;
  • the relationship between grayscale and luminance in the grayscale luminance lookup table corresponds to the first electro-optical conversion function; in the grayscale interval of the grayscale threshold to 255 grayscale And the relationship between the gray scale and the brightness in the gray scale brightness lookup table corresponds to the second electro-optical conversion function;
  • the slope of the curve of the second electro-optic transfer function is greater than the slope of the curve of the first electro-optic transfer function over a range of the second brightness threshold to the maximum brightness value.
  • the second electro-optical conversion function is:
  • the preset gray scale compression formula is:
  • Gt is a grayscale threshold calculated in step 2
  • gray1 is a 10-bit code corresponding to the first luminance threshold calculated according to a preset first luminance threshold and a preset 10-bit luminance grayscale conversion formula.
  • Grayscale value is a 10-bit encoded grayscale value corresponding to the maximum luminance value calculated according to the maximum luminance value and the preset 10-bit luminance grayscale conversion formula, and the grayx ranges from gray1 to gray2;
  • the 10-bit luminance gray scale conversion formula is:
  • L is the luminance value
  • gray is the grayscale value of the 10-bit encoding corresponding to the luminance value
  • the 8-bit coded grayscale value ranges from 0 to 255
  • the 10-bit coded grayscale value ranges from 0 to 1023.
  • the present invention can improve the gray-scale brightness curve of the RGBW liquid crystal display device by replacing the curve of the first electro-optic conversion function of the original dotted line portion by the curve of the second electro-optical conversion function.
  • the slope of the curve in the highlight interval ie, the interval from the second brightness threshold to the maximum brightness value
  • the brightness difference corresponding to the same gray level difference in the highlight interval becomes larger to accommodate the human eye for the high brightness picture.
  • the liquid crystal display device has the characteristics of poor dark state characteristics.
  • the gray scale brightness lookup table of the RGBW liquid crystal display device is generated by interpolation, and the gray scale values in the gray scale brightness lookup table are all integer gray scales by interpolation.
  • Step 4 Adjust the brightness of the RGBW liquid crystal display device according to the gray scale brightness lookup table generated in the step 3.
  • the present invention further provides a brightness adjustment device for an RGBW liquid crystal display device, comprising: a parameter acquisition module 1, a grayscale threshold calculation module 3 associated with the parameter acquisition module 2, and the parameter acquisition module 1 a lookup table generating module 4 associated with the grayscale threshold calculation module 2, and a brightness adjustment module 4 associated with the lookup table 3 generation module;
  • the parameter obtaining module 1 is configured to acquire a maximum brightness value of the RGBW liquid crystal display device, a preset first brightness threshold, a preset second brightness threshold, and a preset gamma value, the second brightness threshold Greater than the first brightness threshold;
  • the grayscale threshold calculation module 2 is configured to calculate a grayscale value corresponding to the first brightness threshold according to a preset first brightness threshold, a preset gamma value, and a preset first electro-optical conversion function, and Defining the grayscale value as a grayscale threshold;
  • the lookup table generating module 3 is configured to generate the RGBW liquid crystal display device according to a maximum brightness value, a grayscale threshold, a preset first electro-optical conversion function, and a preset second electro-optical conversion function of the RGBW liquid crystal display device.
  • a gray scale brightness lookup table such that the relationship between gray scale and brightness in the gray scale brightness lookup table and the first electro-optic turn in the gray scale interval of 0 gray scale to gray scale threshold Corresponding to the change function; in the grayscale interval of the grayscale threshold to 255 grayscale, the relationship between the grayscale and the brightness in the grayscale luminance lookup table corresponds to the second electro-optical conversion function;
  • the slope of the curve of the second electro-optical conversion function is greater than the slope of the curve of the first electro-optic conversion function in a range from the second brightness threshold to the maximum brightness value;
  • the brightness adjustment module 4 is configured to adjust the brightness of the RGBW liquid crystal display device according to the gray scale brightness lookup table generated by the lookup table generation module 3.
  • the preset gamma value ranges from 1.8 to 2.4
  • the first brightness threshold and the second brightness threshold may be selected according to the maximum brightness value according to an actual situation
  • the RGBW liquid crystal display device adopts 8
  • the gray level of the bit code that is, 0 gray scale to 255 gray scale.
  • the maximum brightness value of the provided RGBW liquid crystal display device is 1000 nits
  • the preset first brightness threshold is 100 nits
  • the preset second brightness threshold is 700 nits
  • the preset gamma The value is 2.2.
  • the first electro-optic conversion function is a standard gamma curve function of a preset gamma value:
  • Lum Lmax ⁇ (G/255) gamma ;
  • G is an 8-bit encoded grayscale value
  • Lum is a luminance value corresponding to the grayscale value
  • Lmax is a maximum luminance value of the RGBW liquid crystal display device
  • gamma is a preset gamma value.
  • the second electro-optical conversion function is:
  • the preset gray scale compression formula is:
  • Gt is a grayscale threshold
  • gray1 is a grayscale value of a 10-bit code corresponding to the first brightness threshold calculated according to a preset first brightness threshold and a preset 10-bit brightness grayscale conversion formula
  • gray2 is The grayscale value of the 10-bit code corresponding to the maximum brightness value calculated according to the maximum brightness value and the preset 10-bit brightness gray scale conversion formula, the grayx value range is gray1 to gray2;
  • the 10-bit luminance gray scale conversion formula is:
  • L is the luminance value
  • gray is the grayscale value of the 10-bit encoding corresponding to the luminance value
  • the present invention can improve the gray-scale brightness curve of the RGBW liquid crystal display device by replacing the curve of the first electro-optic conversion function of the original dotted line portion by the curve of the second electro-optical conversion function.
  • the slope of the curve in the highlight interval ie, the interval from the second brightness threshold to the maximum brightness value
  • the brightness difference corresponding to the same gray level difference in the highlight interval becomes larger to accommodate the human eye for the high brightness picture.
  • the liquid crystal display device has the characteristics of poor dark state characteristics.
  • the lookup table generating module 3 generates an gray scale brightness lookup table of the RGBW liquid crystal display device by using an interpolation method, and the gray scale values in the gray scale brightness lookup table are all integer gray scales by interpolation.
  • the present invention provides a brightness adjustment method and apparatus for an RGBW liquid crystal display device, which can achieve both dark state characteristics of a liquid crystal display device by using different electro-optical conversion functions in a low gray scale and a high gray scale interval.
  • the difference between the difference and the maximum brightness value of the RGBW liquid crystal display device improves the detail presentation capability of the RGBW liquid crystal display device in the high gray scale picture.

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  • Liquid Crystal Display Device Control (AREA)

Abstract

一种RGBW液晶显示装置的亮度调节方法及装置。利用第一电光转换函数和第二电光转换函数生成RGBW液晶显示装置的灰阶亮度查找表，使该灰阶亮度查找表在0灰阶到灰阶阈值的区间内的灰阶与亮度的关系与第一电光转换函数对应，在灰阶阈值到255灰阶的区间内的灰阶与亮度的关系与第二电光转换函数对应；灰阶阈值为第一亮度阈值对应的灰阶值；在第二亮度阈值到最大亮度值的区间内，第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；第二亮度阈值大于第一亮度阈值；能够兼顾液晶显示装置本身暗态特性较差与RGBW液晶显示装置最大亮度值较高的特点，提升RGBW液晶显示装置在高灰阶画面的细节呈现能力。

Description

RGBW液晶显示装置的亮度调节方法及装置 技术领域
本发明涉及显示技术领域，尤其涉及一种RGBW液晶显示装置的亮度调节方法及装置。
背景技术
随着显示技术的发展，液晶显示器(Liquid Crystal Display，LCD)等平面显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。
现有的液晶显示器通常包括多个阵列排布的像素单元，每一个像素单元又包括依次排列的红色子像素、绿色子像素、及蓝色子像素，这种三色像素单元的液晶显示器由于亮度水平较低，所以仍可沿用传统的阴极射线管(Cathode Ray Tube，CRT)显示器的电光特性曲线，也即灰阶与亮度曲线遵循伽马(Gamma)值等于2.2的伽马曲线，也即Lum＝Lmax×(Gray/255)2.2，其中，Gray为灰阶值，Lum为灰阶值Gray对应的亮度，Lmax为该液晶显示器的最大亮度。进一步地，现有技术出现了一种红绿蓝白(RGBW)四色显示装置，其是在传统红绿蓝(RGB)三色显示装置中增加白色子像素，所述白色子像素由高透过率的有机材料形成，可大幅提升液晶显示器的亮度和穿透率，具体地，目前RGB三色显示装置的最大亮度通常在400-500nits水平，而RGBW四色显示装置的最大亮度则可以达到700-1200nits左右。人眼对于不同亮度的识别能力不同，在较低的亮度区间中，人眼能够识别出极小的亮度差异，而在较高的亮度区间中，人眼对于较大的亮度差异才能具体识别其中的差异，因而对于最大亮度值较高的显示器件，若继续沿用传统的阴极射线管显示器的电光特性曲线，会影响人眼对高亮区域的亮度识别，无法呈现高动态对比度(high dynamic range，HDR)的优质图像。
为解决上述问题现有技术提出了一种新的电光转换函数(Electro-Optical Transfer Function，EOTF)，其采用10比特度编码至最大10000nits的亮度，能够呈现高动态对比度的优质图像，但是，由于液晶显示器为被动发光器件，灰阶的亮暗需要通过液晶分子的双折射效应与偏光片的偏振特性结合来控制，双折射效应与偏光片的偏振特性往往具有非理想性，因而相对于主动发光型的显示器件，液晶显示器通常在暗态时表现 不够理想，因而在具体操作上无法充分利用上述的新EOTF在低亮度区间的特性，并且相对于电视产品通常应用于较暗的环境中，移动智能设备通常应用于日常室内环境与户外环境中，具有较大的环境光亮度，因而移动智能设备的显示器在暗部切分过多的灰阶在环境光影响时并不具备实际的应用价值，因此，需要一种新的RGBW液晶显示装置的亮度调节方法及装置，兼顾液晶显示器本身暗态特性较差与RGBW液晶显示器最大亮度值较高的特性，提升RGBW液晶显示器在高灰阶画面的细节呈现能力。
发明内容
本发明的目的在于提供一种RGBW液晶显示装置的亮度调节方法，能够兼顾液晶显示装置本身暗态特性较差与RGBW液晶显示装置最大亮度值较高的特点，提升RGBW液晶显示装置在高灰阶画面的细节呈现能力。
本发明的目的还在于提供一种RGBW液晶显示装置的亮度调节装置，能够兼顾液晶显示装置本身暗态特性较差与RGBW液晶显示装置最大亮度值较高的特点，提升RGBW液晶显示装置在高灰阶画面的细节呈现能力。
为实现上述目的，本发明提供了一种RGBW液晶显示装置的亮度调节方法，包括如下步骤：
步骤1、提供一RGBW液晶显示装置，获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值；
步骤2、根据预设的第一亮度阈值、预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，定义该灰阶值为灰阶阈值；
步骤3、根据所述RGBW液晶显示装置的最大亮度值、步骤2中计算得到的灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表；
在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；
步骤4、根据所述步骤3中生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度。
所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：
Lum＝Lmax×(G/255)gamma；
其中，G为8比特编码的灰阶值，Lum为该灰阶值对应的亮度值，Lmax为所述RGBW液晶显示装置的最大亮度值，gamma为预设的伽马值。
所述第二电光转换函数为：
Figure PCTCN2017081031-appb-000001
其中，grayx为根据预设的灰阶压缩公式计算得到的8比特编码的灰阶值G对应的10比特编码的灰阶值，m1＝0.159，m2＝78.844，C1＝0.836，C2＝18.85，C3＝18.69；
所述预设的灰阶压缩公式为：
Figure PCTCN2017081031-appb-000002
其中，Gt为步骤2中计算得到的灰阶阈值，gray1为根据预设的第一亮度阈值和预设的10比特亮度灰阶转换公式计算得到的所述第一亮度阈值对应的10比特编码的灰阶值，gray2为根据最大亮度值和预设的10比特亮度灰阶转换公式计算得到的最大亮度值对应的10比特编码的灰阶值，所述grayx的取值范围为gray1至gray2；
所述10比特亮度灰阶转换公式为：
Figure PCTCN2017081031-appb-000003
其中，L为亮度值，gray为该亮度值对应的10比特编码的灰阶值。
所述预设的伽马值的取值范围为1.8至2.4。
所述步骤3中采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表。
本发明还提供一种RGBW液晶显示装置的亮度调节装置，包括：参数获取模块、与所述参数获取模块关联的灰阶阈值计算模块、与所述参数获取模块和灰阶阈值计算模块关联的查找表生成模块、与所述查找表生成模块关联的亮度调节模块；
所述参数获取模块用于获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值；
所述灰阶阈值计算模块用于根据预设的第一亮度阈值、预设的伽马值、 及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，并定义该灰阶值为灰阶阈值；
所述查找表生成模块用于根据所述RGBW液晶显示装置的最大亮度值、灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表，使得在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；
所述亮度调节模块用于根据所述查找表生成模块生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度。
所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：
Lum＝Lmax×(G/255)gamma；
其中，G为8比特编码的灰阶值，Lum为该灰阶值对应的亮度值，Lmax为所述RGBW液晶显示装置的最大亮度值，gamma为预设的伽马值。
所述第二电光转换函数为：
Figure PCTCN2017081031-appb-000004
其中，grayx为根据预设的灰阶压缩公式计算得到的8比特编码的灰阶值G对应的10比特编码的灰阶值，m1＝0.159，m2＝78.844，C1＝0.836，C2＝18.85，C3＝18.69；
所述预设的灰阶压缩公式为：
Figure PCTCN2017081031-appb-000005
其中，Gt为灰阶阈值，gray1为根据预设的第一亮度阈值和预设的10比特亮度灰阶转换公式计算得到的所述第一亮度阈值对应的10比特编码的灰阶值，gray2为根据最大亮度值和预设的10比特亮度灰阶转换公式计算得到的最大亮度值对应的10比特编码的灰阶值，所述grayx的取值范围为gray1至gray2；
所述10比特亮度灰阶转换公式为：
Figure PCTCN2017081031-appb-000006
其中，L为亮度值，gray为该亮度值对应的10比特编码的灰阶值。
所述预设的伽马值的取值范围为1.8至2.4。
所述查找表生成模块采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表。
本发明还提供一种RGBW液晶显示装置的亮度调节方法，包括如下步骤：
步骤1、提供一RGBW液晶显示装置，获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值；
步骤2、根据预设的第一亮度阈值、预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，定义该灰阶值为灰阶阈值；
步骤3、根据所述RGBW液晶显示装置的最大亮度值、步骤2中计算得到的灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表；
在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；
步骤4、根据所述步骤3中生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度；
其中，所述预设的伽马值的取值范围为1.8至2.4；
其中，所述步骤3中采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表。
本发明的有益效果：本发明提供一种RGBW液晶显示装置的亮度调节方法，该方法首先根据预设的第一亮度阈值、预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，定义该灰阶值为灰阶阈值，再根据所述RGBW液晶显示装置的最大亮度值、灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表，并使得该灰阶亮度查找表在0灰阶到灰阶阈值的低灰阶区间内的灰阶与亮度的关系与预设的伽马值的标准伽马曲线函数即第一电光转换函数对应，在灰阶阈值到255灰阶的高灰阶区间内灰阶与亮度的关系与第二电光转换函数对应，所述第二电光转换函数在高亮 区间内的曲线斜率大于所述预设的伽马值的标准伽马曲线函数的曲线斜率，通过在低灰阶与高灰阶区间采用不同的电光转换函数，能够兼顾液晶显示装置本身暗态特性较差与RGBW液晶显示装置最大亮度值较高的特点，提升RGBW液晶显示装置在高灰阶画面的细节呈现能力。本发明提供还一种RGBW液晶显示装置的亮度调节装置，能够兼顾液晶显示装置本身暗态特性较差与RGBW液晶显示装置最大亮度值较高的特点，提升RGBW液晶显示装置在高灰阶画面的细节呈现能力。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1本发明的RGBW液晶显示装置的亮度调节方法中灰阶与亮度的变化曲线和现有的液晶显示装置中的灰阶与亮度的变化曲线的对比图；
图2为本发明的RGBW液晶显示装置的亮度调节装置的模块图；
图3为本发明的RGBW液晶显示装置的亮度调节方法的流程图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图3，本发明提供一种RGBW液晶显示装置的亮度调节方法，包括如下步骤：
步骤1、提供一RGBW液晶显示装置，获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值。
具体地，所述预设的伽马值的取值范围为1.8至2.4，所述第一亮度阈值和第二亮度阈值可参考最大亮度值结合实际情况进行选择，所述RGBW液晶显示装置采用8比特编码的灰阶，即0灰阶到255灰阶。
举例说明，在本发明的一个实施例中，提供的RGBW液晶显示装置的最大亮度值为1000nits，预设的第一亮度阈值为100nits，预设的第二亮度阈值为700nits，预设的伽马值为2.2。
步骤2、根据预设的第一亮度阈值预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，定义该灰阶值为灰阶阈 值。
具体地，在所述步骤2中，所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：Lum＝Lmax×(G/255)gamma；
其中，G为8比特编码的灰阶值，Lum为该灰阶值对应的亮度值，Lmax为所述RGBW液晶显示装置的最大亮度值，gamma为预设的伽马值。
所述步骤2根据预设的伽马值的标准伽马曲线函数计算得到灰阶阈值，具体在上述实施例中所述灰阶阈值等于255×(100/1000)1/2.2，即90灰阶。
步骤3、根据所述RGBW液晶显示装置的最大亮度值、步骤2中计算得到的灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表；
在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率。
具体地，在上述步骤3中，所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：Lum＝Lmax×(G/255)gamma。
所述第二电光转换函数为：
Figure PCTCN2017081031-appb-000007
其中，grayx为根据预设的灰阶压缩公式计算得到的8比特编码的灰阶值G对应的10比特编码的灰阶值，m1＝0.159，m2＝78.844，C1＝0.836，C2＝18.85，C3＝18.69；
所述预设的灰阶压缩公式为：
Figure PCTCN2017081031-appb-000008
其中，Gt为步骤2中计算得到的灰阶阈值，gray1为根据预设的第一亮度阈值和预设的10比特亮度灰阶转换公式计算得到的所述第一亮度阈值对应的10比特编码的灰阶值，gray2为根据最大亮度值和预设的10比特亮度灰阶转换公式计算得到的最大亮度值对应的10比特编码的灰阶值，所述grayx的取值范围为gray1至gray2；
所述10比特亮度灰阶转换公式为：
Figure PCTCN2017081031-appb-000009
其中，L为亮度值，gray为该亮度值对应的10比特编码的灰阶值。
具体地，所述8比特编码的灰阶值的取值范围为0至255，所述10比特编码的灰阶值的取值范围为0至1023。
需要说明的是，如图1所示，图1中的虚线部分和0灰阶到Gt灰阶的实线部分共同组成的了第一电光转换函数的曲线，Gt到255灰阶的实线为第二电光转换函数的曲线，从图1可知，本发明通过第二电光转换函数的曲线取代原有虚线部分的第一电光转换函数的曲线，可提升所述RGBW液晶显示装置的灰阶亮度曲线在高亮区间(即第二亮度阈值到最大亮度值的区间)内的曲线斜率，从而使得高亮区间中相同灰阶差值对应的亮度差值变大，以适应人眼对高亮度画面的亮度差异识别能力，达到接近HDR显示的效果。与此同时，通过使得0灰阶到灰阶阈值之间保留为原有的伽马曲线，以兼顾液晶显示装置在本身暗态特性较差的特点。
优选地，所述步骤3中采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表，通过插值法使得灰阶亮度查找表中灰阶值均为整数灰阶。
步骤4、根据所述步骤3中生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度。
请参阅图2，本发明还提供一种RGBW液晶显示装置的亮度调节装置，包括：参数获取模块1、与所述参数获取模块2关联的灰阶阈值计算模块3、与所述参数获取模块1和灰阶阈值计算模块2关联的查找表生成模块4、与所述查找表3生成模块关联的亮度调节模块4；
所述参数获取模块1用于获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值；
所述灰阶阈值计算模块2用于根据预设的第一亮度阈值、预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，并定义该灰阶值为灰阶阈值；
所述查找表生成模块3用于根据所述RGBW液晶显示装置的最大亮度值、灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表，使得在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转 换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；
所述亮度调节模块4用于根据所述查找表生成模块3生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度。
具体地，所述预设的伽马值的取值范围为1.8至2.4，所述第一亮度阈值和第二亮度阈值可参考最大亮度值结合实际情况进行选择，所述RGBW液晶显示装置采用8比特编码的灰阶，即0灰阶到255灰阶。
举例说明，在本发明的一个实施例中，提供的RGBW液晶显示装置的最大亮度值为1000nits，预设的第一亮度阈值为100nits，预设的第二亮度阈值为700nits，预设的伽马值为2.2。
具体地，所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：
Lum＝Lmax×(G/255)gamma；
其中，G为8比特编码的灰阶值，Lum为该灰阶值对应的亮度值，Lmax为所述RGBW液晶显示装置的最大亮度值，gamma为预设的伽马值。
所述第二电光转换函数为：
Figure PCTCN2017081031-appb-000010
其中，grayx为根据预设的灰阶压缩公式计算得到的8比特编码的灰阶值G对应的10比特编码的灰阶值，m1＝0.159，m2＝78.844，C1＝0.836，C2＝18.85，C3＝18.69；
所述预设的灰阶压缩公式为：
Figure PCTCN2017081031-appb-000011
其中，Gt为灰阶阈值，gray1为根据预设的第一亮度阈值和预设的10比特亮度灰阶转换公式计算得到的所述第一亮度阈值对应的10比特编码的灰阶值，gray2为根据最大亮度值和预设的10比特亮度灰阶转换公式计算得到的最大亮度值对应的10比特编码的灰阶值，所述grayx的取值范围为gray1至gray2；
所述10比特亮度灰阶转换公式为：
Figure PCTCN2017081031-appb-000012
其中，L为亮度值，gray为该亮度值对应的10比特编码的灰阶值。
需要说明的是，如图1所示，图1中的虚线部分和0灰阶到Gt灰阶的实线部分共同组成的了第一电光转换函数的曲线，Gt到255灰阶的实线为第二电光转换函数的曲线，从图1可知，本发明通过第二电光转换函数的曲线取代原有虚线部分的第一电光转换函数的曲线，可提升所述RGBW液晶显示装置的灰阶亮度曲线在高亮区间(即第二亮度阈值到最大亮度值的区间)内的曲线斜率，从而使得高亮区间中相同灰阶差值对应的亮度差值变大，以适应人眼对高亮度画面的亮度差异识别能力，达到接近HDR显示的效果。与此同时，通过使得0灰阶到灰阶阈值之间保留为原有的伽马曲线，以兼顾液晶显示装置在本身暗态特性较差的特点。
优选地，所述查找表生成模块3采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表，通过插值法使得灰阶亮度查找表中灰阶值均为整数灰阶。
综上所述，本发明提供一种RGBW液晶显示装置的亮度调节方法及装置，该方法通过在低灰阶与高灰阶区间采用不同的电光转换函数，能够兼顾液晶显示装置本身暗态特性较差与RGBW液晶显示装置最大亮度值较高的特点，提升RGBW液晶显示装置在高灰阶画面的细节呈现能力。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (13)

  1. 一种RGBW液晶显示装置的亮度调节方法，包括如下步骤：
    步骤1、提供一RGBW液晶显示装置，获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值；
    步骤2、根据预设的第一亮度阈值、预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，定义该灰阶值为灰阶阈值；
    步骤3、根据所述RGBW液晶显示装置的最大亮度值、步骤2中计算得到的灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表；
    在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
    在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；
    步骤4、根据所述步骤3中生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度。
  2. 如权利要求1所述的RGBW液晶显示装置的亮度调节方法，其中，所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：
    Lum＝Lmax×(G/255)gamma；
    其中，G为8比特编码的灰阶值，Lum为该灰阶值对应的亮度值，Lmax为所述RGBW液晶显示装置的最大亮度值，gamma为预设的伽马值。
  3. 如权利要求1所述的RGBW液晶显示装置的亮度调节方法，其中，所述第二电光转换函数为：
    Figure PCTCN2017081031-appb-100001
    其中，grayx为根据预设的灰阶压缩公式计算得到的8比特编码的灰阶值G对应的10比特编码的灰阶值，m1＝0.159，m2＝78.844，C1＝0.836，C2＝18.85，C3＝18.69；
    所述预设的灰阶压缩公式为：
    Figure PCTCN2017081031-appb-100002
    其中，Gt为步骤2中计算得到的灰阶阈值，gray1为根据预设的第一亮度阈值和预设的10比特亮度灰阶转换公式计算得到的所述第一亮度阈值对应的10比特编码的灰阶值，gray2为根据最大亮度值和预设的10比特亮度灰阶转换公式计算得到的最大亮度值对应的10比特编码的灰阶值，所述grayx的取值范围为gray1至gray2；
    所述10比特亮度灰阶转换公式为：
    Figure PCTCN2017081031-appb-100003
    其中，L为亮度值，gray为该亮度值对应的10比特编码的灰阶值。
  4. 如权利要求1所述的RGBW液晶显示装置的亮度调节方法，其中，所述预设的伽马值的取值范围为1.8至2.4。
  5. 如权利要求1所述的RGBW液晶显示装置的亮度调节方法，其中，所述步骤3中采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表。
  6. 一种RGBW液晶显示装置的亮度调节装置，包括：参数获取模块、与所述参数获取模块关联的灰阶阈值计算模块、与所述参数获取模块和灰阶阈值计算模块关联的查找表生成模块、与所述查找表生成模块关联的亮度调节模块；
    所述参数获取模块用于获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值；
    所述灰阶阈值计算模块用于根据预设的第一亮度阈值、预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，并定义该灰阶值为灰阶阈值；
    所述查找表生成模块用于根据所述RGBW液晶显示装置的最大亮度值、灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表，使得在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
    在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；
    所述亮度调节模块用于根据所述查找表生成模块生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度。
  7. 如权利要求6所述的RGBW液晶显示装置的亮度调节装置，其中，所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：
    Lum＝Lmax×(G/255)gamma；
    其中，G为8比特编码的灰阶值，Lum为该灰阶值对应的亮度值，Lmax为所述RGBW液晶显示装置的最大亮度值，gamma为预设的伽马值。
  8. 如权利要求6所述的RGBW液晶显示装置的亮度调节装置，其中，所述第二电光转换函数为：
    Figure PCTCN2017081031-appb-100004
    其中，grayx为根据预设的灰阶压缩公式计算得到的8比特编码的灰阶值G对应的10比特编码的灰阶值，m1＝0.159，m2＝78.844，C1＝0.836，C2＝18.85，C3＝18.69；
    所述预设的灰阶压缩公式为：
    Figure PCTCN2017081031-appb-100005
    其中，Gt为灰阶阈值，gray1为根据预设的第一亮度阈值和预设的10比特亮度灰阶转换公式计算得到的所述第一亮度阈值对应的10比特编码的灰阶值，gray2为根据最大亮度值和预设的10比特亮度灰阶转换公式计算得到的最大亮度值对应的10比特编码的灰阶值，所述grayx的取值范围为gray1至gray2；
    所述10比特亮度灰阶转换公式为：
    Figure PCTCN2017081031-appb-100006
    其中，L为亮度值，gray为该亮度值对应的10比特编码的灰阶值。
  9. 如权利要求6所述的RGBW液晶显示装置的亮度调节装置，其中，所述预设的伽马值的取值范围为1.8至2.4。
  10. 如权利要求6所述的RGBW液晶显示装置的亮度调节装置，其中，所述查找表生成模块采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表。
  11. 一种RGBW液晶显示装置的亮度调节方法，包括如下步骤：
    步骤1、提供一RGBW液晶显示装置，获取所述RGBW液晶显示装置的最大亮度值、预设的第一亮度阈值、预设的第二亮度阈值、和预设的伽马值，所述第二亮度阈值大于第一亮度阈值；
    步骤2、根据预设的第一亮度阈值、预设的伽马值、及预设的第一电光转换函数，计算得到该第一亮度阈值对应的灰阶值，定义该灰阶值为灰阶阈值；
    步骤3、根据所述RGBW液晶显示装置的最大亮度值、步骤2中计算得到的灰阶阈值、预设的第一电光转换函数以及预设的第二电光转换函数生成所述RGBW液晶显示装置的灰阶亮度查找表；
    在0灰阶到灰阶阈值的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第一电光转换函数对应；在灰阶阈值到255灰阶的灰阶区间内，所述灰阶亮度查找表中的灰阶与亮度的关系与第二电光转换函数对应；
    在第二亮度阈值到最大亮度值的区间内，所述第二电光转换函数的曲线斜率大于第一电光转换函数的曲线斜率；
    步骤4、根据所述步骤3中生成的灰阶亮度查找表调节所述RGBW液晶显示装置的亮度；
    其中，所述预设的伽马值的取值范围为1.8至2.4；
    其中，所述步骤3中采用插值法生成所述RGBW液晶显示装置的灰阶亮度查找表。
  12. 如权利要求11所述的RGBW液晶显示装置的亮度调节方法，其中，所述第一电光转换函数为预设的伽马值的标准伽马曲线函数：
    Lum＝Lmax×(G/255)gamma；
    其中，G为8比特编码的灰阶值，Lum为该灰阶值对应的亮度值，Lmax为所述RGBW液晶显示装置的最大亮度值，gamma为预设的伽马值。
  13. 如权利要求11所述的RGBW液晶显示装置的亮度调节方法，其中，所述第二电光转换函数为：
    Figure PCTCN2017081031-appb-100007
    其中，grayx为根据预设的灰阶压缩公式计算得到的8比特编码的灰阶值G对应的10比特编码的灰阶值，m1＝0.159，m2＝78.844，C1＝0.836，C2＝18.85，C3＝18.69；
    所述预设的灰阶压缩公式为：
    Figure PCTCN2017081031-appb-100008
    其中，Gt为步骤2中计算得到的灰阶阈值，gray1为根据预设的第一亮度阈值和预设的10比特亮度灰阶转换公式计算得到的所述第一亮度阈值对应的10比特编码的灰阶值，gray2为根据最大亮度值和预设的10比特亮度灰阶转换公式计算得到的最大亮度值对应的10比特编码的灰阶值，所述grayx的取值范围为gray1至gray2；
    所述10比特亮度灰阶转换公式为：
    Figure PCTCN2017081031-appb-100009
    其中，L为亮度值，gray为该亮度值对应的10比特编码的灰阶值。
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