WO2018119909A1 - 一种rgbw像素渲染装置及方法 - Google Patents

一种rgbw像素渲染装置及方法 Download PDF

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WO2018119909A1
WO2018119909A1 PCT/CN2016/113104 CN2016113104W WO2018119909A1 WO 2018119909 A1 WO2018119909 A1 WO 2018119909A1 CN 2016113104 W CN2016113104 W CN 2016113104W WO 2018119909 A1 WO2018119909 A1 WO 2018119909A1
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rgbw
pixel
luminance
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French (fr)
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潘彪
钟新辉
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan 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
    • 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
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G2320/06—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • 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

Definitions

  • the invention relates to a liquid crystal display technology, in particular to an RGBW pixel rendering device and method.
  • the RGBW display includes white (W) sub-pixels in addition to the red (R), green (G), and blue (B) sub-pixels.
  • the addition of white sub-pixels can greatly improve the wear of the LCD.
  • RGBW adds a W sub-pixel, which will bring about a decline in physical resolution.
  • SPR sub-pixel rendering
  • the RGBW display device based on the conventional SPR method in the conversion process from the input RGB signal to the output RGBW signal, may result in loss of partial sub-pixel information, resulting in loss of display details of different degrees.
  • the traditional SPR method is not treated differently, but is processed in the same way, which will result in insufficient brightness of the text display, unclear details, and insufficient picture display. Smoothing and many other issues.
  • the present invention provides an RGBW pixel rendering apparatus and method. Therefore, the display details are not lost under the premise that the display device has a higher resolution.
  • the present invention provides an RGBW pixel rendering apparatus, the rendering apparatus comprising:
  • An extracting unit configured to acquire RGB grayscale values of three primary color components of each pixel of the original image in the RGB color space, and send the RGB grayscale values to the converting unit;
  • a conversion unit configured to calculate an RGB grayscale value by grayscale brightness conversion and send the brightness value of the RGB to the sampling unit, and calculate the RGBW grayscale value of the pixel unit by using the second RGBW luminance value to calculate the RGBW grayscale value of the pixel unit.
  • a sampling unit configured to convert the luminance value of the RGB into the first RGBW luminance value and send the signal to the rendering unit
  • the determining unit is configured to obtain the saturation value and the brightness value of each group of two pixels in the original image in two or two groups in order, and perform subtraction calculation on the saturation value and the brightness value respectively to obtain a saturation difference and brightness.
  • the difference is determined according to the saturation difference and the luminance difference of the two pixels of each group, and the judgment result is obtained and sent to the rendering unit;
  • a rendering unit configured to render the first RGBW luminance value according to the determination result to obtain the second RGBW luminance value after the rendering, and send the converted to the conversion unit for conversion.
  • the conversion unit includes a first conversion unit and a second conversion unit;
  • the first converting unit is configured to calculate an RGB grayscale value by using a grayscale luminance to obtain a luminance value of the RGB and send the luminance value to the sampling unit;
  • the second converting unit is configured to calculate the RGBW grayscale value of the pixel unit by calculating the second RGBW luminance value by using the luminance to grayscale.
  • the determining unit determines, according to the saturation difference value and the brightness difference value of the two pixel points of each group, that the saturation difference value of each group is smaller than the first threshold value and the brightness difference value. If the average value is greater than the second threshold, the determining unit determines that the original image is a text mode, otherwise the determining unit determines that the original image is a picture mode.
  • the rendering unit when the determining result is a picture mode, the rendering unit will be the second pixel of each group.
  • a method of adding and averaging luminance values of sub-pixels of the same type in an RGBW luminance value is performed to obtain a second RGBW luminance value.
  • the rendering unit respectively calculates a total brightness value of the first RGBW brightness value of two pixels of each group, and determines a total brightness value of the two pixel points, thereby A corresponding second RGBW luminance value is obtained, and the total luminance value of the pixel is calculated by the following formula:
  • the first RGBW luminance value of the pixel includes four sub-pixels whose luminance values are W n , R n , G n , B n , n are the positions of the positions of the pixel in the original image, and P n is the pixel unit.
  • the total brightness value of the first RGBW brightness value of the pixel point is obtained by the above calculation formula;
  • the luminance values of the W sub-pixels in the first RGBW luminance value of the two pixel points are added. Averaged as the brightness value of the rendered W sub-pixel, and the total brightness value of the right pixel is used as the brightness value of the three RGB sub-pixels after the rendering, to obtain the second RGBW brightness value;
  • the total brightness value of the left pixel is smaller than the total brightness value of the right pixel, the total brightness value of the left pixel is used as the brightness value of the rendered W sub-pixel, and the first RGBW of the two pixels is used.
  • the luminance values of the R sub-pixels in the luminance value are added and averaged as the luminance value of the rendered R sub-pixel, and the luminance values of the G sub-pixels in the first RGBW luminance values of the two pixel points are added and averaged as a rendering.
  • the luminance value of the subsequent G sub-pixel is obtained by adding and averaging the luminance values of the B sub-pixels in the first RGBW luminance values of the two pixel points as the luminance values of the rendered B sub-pixels to obtain the second RGBW luminance value.
  • the invention also provides an RGBW pixel rendering method, comprising the following steps:
  • Step S01 the extracting unit acquires RGB grayscale values of the three primary color components of each pixel of the original image in the RGB color space, and sends the RGB grayscale values to the converting unit;
  • Step 2 The conversion unit calculates the brightness value of the RGB by using the RGB gray scale value through the gray scale brightness conversion and sends the brightness value to the sampling unit;
  • Step 3 S03, the sampling unit converts the brightness value of the RGB into the first RGBW brightness value and sends the brightness value to the rendering unit;
  • Step 4 S04, the determining unit sequentially sets the saturation value and the brightness value of two pixels of each group in the original image, and performs a subtraction calculation on the saturation value and the brightness value respectively to obtain a saturation difference value. And the brightness difference value, the judging unit judges according to the saturation difference value and the brightness difference value of the two pixel points of each group, and obtains the judgment result, and then sends the result to the rendering unit;
  • Step 5 After receiving the determination result, the rendering unit renders the first RGBW brightness value according to the determination result to obtain the rendered second RGBW brightness value and sends the converted second RGBW brightness value to the conversion unit for conversion;
  • Step 6 S06: The converting unit outputs the RGBW grayscale value of the pixel point by calculating the second RGBW luminance value by the luminance to grayscale.
  • the conversion unit includes a first conversion unit and a second conversion unit;
  • the RGB grayscale value is calculated by the first converting unit by the grayscale turning brightness to obtain the luminance value of the RGB, and then sent to the sampling unit;
  • the rendering unit After the rendering unit sends the rendered second RGBW luminance value to the conversion unit, the second RGBW luminance value is calculated by the second conversion unit to obtain the RGBW grayscale value of the pixel point and then output.
  • the determining condition that the determining unit performs the determining according to the saturation difference value and the brightness difference value of the two pixel points of each group in the step S04 is:
  • the determining unit determines that the original image is a text mode, otherwise the determining unit determines that the original image is a picture mode.
  • the rendering unit when the determining result is a picture mode, performs a method of adding and averaging luminance values of the same type of sub-pixels in the first RGBW luminance values of the two pixels of each group to obtain a first Two RGBW brightness values.
  • the rendering unit calculates the total brightness value of the first RGBW brightness value of the two pixel points of each group separately, and determines the total brightness value of the two pixel points. Breaking, thereby obtaining a corresponding second RGBW luminance value, the total luminance value of the pixel is calculated by the following formula:
  • the first RGBW luminance value of the pixel includes the luminance values of the four sub-pixels, respectively W n , R n , G n , B n , n is the position number of the pixel in the original image, and P n is the pixel.
  • the total brightness value of the point, and the total brightness value of the pixel point is obtained by the above calculation formula;
  • the luminance values of the W sub-pixels in the first RGBW luminance value of the two pixel points are added. Averaged as the brightness value of the rendered W sub-pixel, and the total brightness value of the right pixel is used as the brightness value of the three RGB sub-pixels after the rendering, to obtain the second RGBW brightness value;
  • the total brightness value of the left pixel is smaller than the total brightness value of the right pixel, the total brightness value of the left pixel is used as the brightness value of the rendered W sub-pixel, and the first RGBW of the two pixels is used.
  • the luminance values of the R sub-pixels in the luminance value are added and averaged as the luminance value of the rendered R sub-pixel, and the luminance values of the G sub-pixels in the first RGBW luminance values of the two pixel points are added and averaged as a rendering.
  • the luminance value of the subsequent G sub-pixel is obtained by adding and averaging the luminance values of the B sub-pixels in the first RGBW luminance values of the two pixel points as the luminance values of the rendered B sub-pixels to obtain the second RGBW luminance value.
  • the present invention obtains the grayscale value of the three primary color components in the RGB color space of each pixel of the original image and converts it into RGB luminance value, and converts the RGB luminance value into the RGBW luminance value, according to different
  • the display mode outputs the second RGBW grayscale value through Gamma conversion, ensuring that the display has a higher resolution, the display details are not lost, and the text and the image are separately processed.
  • the result of the picture processing is to make the picture display smoother, and the result of the word processing is that the brightness of the text display is increased and the details are more clear.
  • FIG. 1 is a block diagram showing the structure of an RGBW rendering apparatus of the present invention
  • FIG. 3 is a schematic diagram of pixel rendering in a picture mode of the present invention.
  • FIG. 4 is a schematic diagram of pixel rendering in the text mode of the present invention.
  • an RGBW pixel rendering device of the present invention the rendering device includes:
  • An extracting unit configured to acquire RGB grayscale values of three primary color components of each pixel of the original image in the RGB color space, and send the RGB grayscale values to the converting unit;
  • a conversion unit configured to calculate an RGB grayscale value by grayscale conversion brightness and send the brightness value of the RGB to the sampling unit, and calculate the RGBW grayscale value of the pixel point by calculating the second RGBW luminance value by using the luminance to grayscale ;
  • a sampling unit configured to convert the luminance value of the RGB into the first RGBW luminance value and send the signal to the rendering unit
  • the determining unit is configured to obtain the saturation value and the brightness value of each group of two pixels in the original image in two or two groups in order, and perform subtraction calculation on the saturation value and the brightness value respectively to obtain a saturation difference and brightness.
  • the difference, the judging unit judges according to the saturation difference and the brightness difference of the two pixels of each group, and obtains the judgment result, and then sends the result to the rendering unit;
  • a rendering unit configured to render the first RGBW luminance value according to the determination result to obtain the second RGBW luminance value after the rendering, and send the converted to the conversion unit for conversion.
  • the conversion unit of the present invention includes a first conversion unit and a second conversion unit;
  • the first converting unit is configured to calculate an RGB grayscale value by using a grayscale luminance to obtain a luminance value of the RGB and send the luminance value to the sampling unit;
  • the second converting unit is configured to output the RGBW grayscale value of the pixel point by calculating the second RGBW luminance value by using the luminance to grayscale.
  • the determining unit performs calculation according to calculating a saturation difference value and a brightness difference value of two pixel points of each group.
  • the judging condition is: determining whether the saturation difference value of each group is smaller than the first threshold value and whether the brightness difference value is greater than the second threshold value, wherein the determining unit determines that the original image is a text mode, otherwise the determining unit determines that the original image is a picture.
  • the first threshold is 1.3 and the second threshold is 0.3.
  • the rendering unit When the determination result is the picture mode, the rendering unit performs a method of adding and averaging the brightness values of the same type of sub-pixels of the first RGBW brightness values of the two pixels of each group to obtain a second RGBW brightness value. .
  • the rendering unit calculates the total brightness value of the first RGBW brightness value of the two pixel points of each group separately, and judges the total brightness value of the two pixel points, thereby calculating corresponding Second RGBW brightness value;
  • the luminance values of the W sub-pixels in the first RGBW luminance value of the two pixel points are added. Averaged as the brightness value of the rendered W sub-pixel, and the total brightness value of the right pixel is used as the brightness value of the three RGB sub-pixels after the rendering, to obtain the second RGBW brightness value;
  • the total brightness value of the left pixel point of the two pixels of each group is smaller than the total brightness value of the right pixel point, the total brightness value of the left pixel point is used as the brightness value of the rendered W sub-pixel,
  • the luminance values of the R sub-pixels in the first RGBW luminance values of the two pixels are added and averaged as the luminance values of the rendered R sub-pixels, and the luminance of the G sub-pixels in the first RGBW luminance values of the two pixels is obtained.
  • the values are added and averaged as the luminance value of the rendered G sub-pixel, and the luminance values of the B sub-pixels in the first RGBW luminance values of the two pixels are added and averaged as the luminance value of the rendered B sub-pixel. , get the second RGBW brightness value.
  • an RGBW pixel rendering method of the present invention includes the following steps:
  • Step S01 the extracting unit acquires RGB grayscale values of the three primary color components of each pixel of the original image in the RGB color space, and sends the RGB grayscale values to the converting unit;
  • Step 2 The conversion unit calculates the brightness value of the RGB by using the RGB gray scale value through the gray scale brightness conversion and sends the brightness value to the sampling unit;
  • Step 3 S03, the sampling unit converts the brightness value of the RGB into the first RGBW brightness value and sends the brightness value to the rendering unit;
  • Step 4 S04, the determining unit sequentially sets the saturation value and the brightness value of two pixels of each group in the original image, and performs a subtraction calculation on the saturation value and the brightness value respectively to obtain a saturation difference value. And the brightness difference value, the judging unit judges according to the saturation difference value and the brightness difference value of the two pixel points of each group, and obtains the judgment result, and then sends the result to the rendering unit;
  • Step 5 After receiving the determination result, the rendering unit renders the first RGBW brightness value according to the determination result to obtain the rendered second RGBW brightness value and sends the converted second RGBW brightness value to the conversion unit for conversion;
  • Step 6 The conversion unit calculates the second RGBW luminance value by using the luminance to grayscale, and obtains the RGBW grayscale value of the pixel and outputs the value.
  • the conversion unit includes a first conversion unit and a second conversion unit;
  • the RGB grayscale value is calculated by the first converting unit by the grayscale turning brightness to obtain the luminance value of the RGB, and then sent to the sampling unit;
  • the rendering unit After the rendering unit sends the rendered second RGBW luminance value to the conversion unit, the second RGBW luminance value is calculated by the second conversion unit to obtain the RGBW grayscale value of the pixel point and then output.
  • the determining condition of the determining unit in the step S04 for determining the saturation difference value and the brightness difference value of the two pixel points of each group is:
  • the determining unit determines that the original image is a text mode, otherwise the determining unit determines that the original image is a picture mode.
  • the rendering unit When the determination result is the picture mode, the rendering unit performs a method of adding and averaging the brightness values of the same type of sub-pixels of the first RGBW brightness values of the two pixels of each group to obtain a second RGBW brightness value. .
  • the rendering unit calculates the total brightness value of the first RGBW brightness value of the two pixel points of each group separately, and judges the total brightness value of the two pixel points, thereby obtaining corresponding Second RGBW brightness value;
  • the luminance values of the W sub-pixels in the first RGBW luminance values of the two pixel points are added and averaged as the luminance values of the rendered W sub-pixels, and the total luminance values of the right-side pixel points are respectively As the brightness value of the three sub-pixels of the RGB after the rendering, the second RGBW brightness value is obtained;
  • the total brightness value of the left pixel point of the two pixels of each group is smaller than the total brightness value of the right pixel point, the total brightness value of the left pixel point is used as the brightness value of the rendered W sub-pixel,
  • the luminance values of the R sub-pixels in the first RGBW luminance values of the two pixels are added and averaged as the luminance values of the rendered R sub-pixels, and the luminance of the G sub-pixels in the first RGBW luminance values of the two pixels is obtained.
  • the luminance values of the selected G sub-pixels are added, and the luminance values of the B sub-pixels in the first RGBW luminance values of the two pixels are added and averaged, and then the luminance values of the selected B sub-pixels are selected. , get the second RGBW brightness value.
  • two pixel points are taken as a group according to the order of each line, for example, the positions of the pixel points in the first line are 1, 2, 3, 4,5,6,7,8,..., then, the pixels in the first row, 1 and 2 are taken as a group, and the pixels in the 3 and 4 positions are taken as a group, 5 and 6 positions
  • the pixels on the top are taken as a group, the pixels on the 7 and 8 positions are taken as a group, and so on.
  • the rendering unit when the determination result is the picture mode, performs the method of adding and averaging the same type of sub-pixels of the two pixels of each group to obtain the second RGBW brightness value;
  • the luminance values of the sub-pixels in the first RGBW luminance value of each pixel point are (W n , R n , G n , B n ), where n is the pixel point in the original image.
  • the number of positions at the location here four examples of pixels, which are (W 1 , R 1 , G 1 , B 1 ), (W 2 , R 2 , G 2 , B 2 ) , (W 3 , R 3 , G 3 , B 3 ), (W 4 , R 4 , G 4 , B 4 ), by formula:
  • the second RGBW brightness value is obtained, and the result is in the picture display mode. Underneath, the transition between adjacent pixels is smoother, and the display effect of the image display, especially the portrait is more ideal (the image function in some image processors utilizes this smoothing method).
  • the rendering unit determines the corresponding second RGBW luminance value by determining the magnitude of the total luminance values of the adjacent two pixel points;
  • the luminance values of four sub-pixels in the first RGBW luminance value of the pixel point are (W n , R n , G n , B n ), where n is the location of the pixel in the original image.
  • the number of positions, P n is the total brightness value of the pixel, and the formula is as follows:
  • the luminance values of four sub-pixels of the first RGBW luminance values of the four pixel points are (W 1 , R 1 , G 1 , B 1 ), (W 2 , R 2 , respectively). , G 2 , B 2 ), (W 3 , R 3 , G 3 , B 3 ), (W 4 , R 4 , G 4 , B 4 ), and the total luminance values of the four pixel points are obtained by the following formulas respectively.
  • P n The luminance values of four sub-pixels of the first RGBW luminance values of the four pixel points are (W 1 , R 1 , G 1 , B 1 ), (W 2 , R 2 , respectively). , G 2 , B 2 ), (W 3 , R 3 , G 3 , B 3 ), (W 4 , R 4 , G 4 , B 4 ), and the total luminance values of the four pixel points are obtained by the following formulas respectively.
  • P n the total luminance values of the four
  • the total brightness value P 1 of the left pixel point in the left set of two pixel points is greater than the total brightness value P 2 of the right pixel point.
  • the left pixel is The total brightness value P 3 of the point is used as the brightness value of the rendered W sub-pixel, and the brightness values of the three sub-pixels of the RGB of the first RGBW brightness value of the two pixel points are respectively added and averaged, and respectively used as the rendered RGB three.
  • the brightness value of each sub-pixel, the second RGBW brightness value is obtained, and the specific formula is:
  • the total luminance value P 1 of the left pixel point in the left group of two pixels is smaller than the total luminance value P 2 of the right pixel point.
  • the total luminance values P 2 of the pixels on the right side are respectively As the brightness value of the three sub-pixels of the RGB after rendering, the second RGBW brightness value is obtained, and the specific formula is:
  • the left pixel is The total brightness value P 3 of the point is used as the brightness value of the rendered W sub-pixel, and the brightness values of the three sub-pixels of the RGB of the first RGBW brightness value of the two pixel points are respectively added and averaged, and respectively used as the rendered RGB three.
  • the brightness value of each sub-pixel, the second RGBW brightness value is obtained, and the specific formula is:
  • the gray scale brightness (De-Gamma conversion) and the brightness to gray scale (Gamma conversion) processes are respectively calculated by the following formula:
  • y is the grayscale value
  • x is the luminance value
  • gamma is 2.2.
  • converting the luminance value of RGB into the first RGBW luminance value is implemented as follows:
  • k is a gain coefficient specified according to the display content, and the value is 2.5 ⁇ k ⁇ 1.
  • the result of image processing is to make the picture display smoother, especially in the aspect of portrait display;

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Abstract

一种RGBW像素渲染装置包括：提取单元，获取RGB灰阶值；转换单元，将RGB灰阶值转换为RGB亮度值及将第二RGBW亮度值转换RGBW灰阶值输出；采样单元，将RGB亮度值转换为第一RGBW亮度值；判断单元，获取饱和度值和亮度值，并对饱和度值和亮度值分别计算得到饱和度差值和亮度差值并判断；渲染单元，根据判断结果对第一RGBW亮度值进行渲染得到第二RGBW亮度值。一种RGBW像素渲染方法包括：获取RGB灰阶值（S01）；将RGB灰阶值转换为RGB亮度值(S02)；将RGB亮度值转换为第一RGBW亮度值(S03)；判断两个像素点的饱和度差值和亮度差值(S04)；根据判断结果对第一RGBW亮度值渲染得到第二RGBW亮度值(S05)；将第二RGBW亮度值转换为RGBW灰阶值输出(S06)。与现有技术相比，保证显示器具有较高分辨率的前提下，显示细节不丢失。

Description

一种RGBW像素渲染装置及方法 技术领域
本发明涉及一种液晶显示技术，特别是一种RGBW像素渲染装置及方法。
背景技术
随着生活水平的提高和显示技术的不断发展，传统的三基色显示系统的缺点逐渐浮现，已很难满足人们日益增长的需求。这主要体现在随着显示屏分辨率的提高，像素的开口率降低，屏幕的光穿透率下降，从而导致背光以及整个屏幕的功耗增加。
RGBW显示屏相对传统RGB显示屏而言，除红(R)、绿(G)、蓝(B)子像素外还包含白色(W)子像素，白色子像素的加入可以极大提高LCD的穿透率、OLED显示器单位面积的发光效率等，由此可实现低功耗，节能环保的目的。
由于在同样的像素设计下，RGBW由于增加了一颗W子像素，因此会带来物理分辨率的下降。在RGBW显示装置中，为了提高显示器的实际分辨率，需要采用子像素渲染的方法(sub-pixel rendering，SPR)。
然而，基于传统的SPR方法的RGBW显示装置，在从输入的RGB信号到输出的RGBW信号的转化过程，都会出现由于部分子像素信息的丢失，从而造成不同程度的显示细节的丢失。同时，对于文字和图片这两种完全不同的显示内容，传统的SPR方法并没有进行区别对待，而是采用相同的方式进行处理，这样就会造成文字显示亮度不够，细节不清晰，图片显示不够平滑等诸多问题。
因此，亟需一种保证显示器具有较高分辨率，且能够保证显示细节不丢失，同时对于文字和图片进行分别处理的RGBW像素渲染方法。
发明内容
为克服现有技术的不足，本发明提供一种RGBW像素渲染装置及方法， 从而保证显示装置具有较高分辨率的前提下，显示细节不会丢失。
本发明提供了一种RGBW像素渲染装置，该渲染装置包括：
提取单元，用于获取原始图像的每个像素点在RGB色彩空间的三基色分量的RGB灰阶值，并将RGB灰阶值发送至转换单元；
转换单元，用于将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元，以及将第二RGBW亮度值通过亮度转灰阶计算得到像素单元的RGBW灰阶值后输出；
采样单元，用于将RGB的亮度值转换为第一RGBW亮度值并发送至渲染单元；
判断单元，用于按顺序两两一组，获取原始图像中每组两个像素点的饱和度值和亮度值，并对饱和度值和亮度值分别进行相减计算得到饱和度差值和亮度差值；根据每组的两个像素点的饱和度差值和亮度差值进行判断得到判断结果后发送至渲染单元；
渲染单元，用于根据判断结果对第一RGBW亮度值进行渲染得到渲染后的第二RGBW亮度值并发送至转换单元进行转换。
可选地，所述转换单元包括第一转换单元和第二转换单元；
所述第一转换单元，用于将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元；
第二转换单元，用于将第二RGBW亮度值通过亮度转灰阶计算得到像素单元的RGBW灰阶值后输出。
可选地，所述判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断的判断条件为，判断每组的饱和度差值是否均小于第一阈值并且亮度差值是否均大于第二阈值，是则判断单元判断原始图像为文字模式，否则判断单元判断原始图像为图片模式。
可选地，所述判断结果为图片模式时，渲染单元将每组的两个像素点的第 一RGBW亮度值中同类型的子像素的亮度值进行相加取平均的方法进行渲染，得到第二RGBW亮度值。
可选地，所述判断结果为文字模式时，渲染单元通过分别计算每组的两个像素点的第一RGBW亮度值的总亮度值，并对两个像素点的总亮度值进行判断，从而得出相应的第二RGBW亮度值，所述像素点的总亮度值的计算采用以下公式：
Figure PCTCN2016113104-appb-000001
其中像素点的第一RGBW亮度值中包含四个子像素的亮度值分别为Wn，Rn，Gn，Bn，n为像素点在原始图像中所在位置的位置数，Pn为像素单元的总亮度值，通过上述计算公式得到像素点的第一RGBW亮度值的总亮度值；
当每组的两个像素点中左边的像素点的总亮度值大于右边的像素点的总亮度值时，则通过将两个像素点的第一RGBW亮度值中W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值；
当左边的像素点的总亮度值小于右边的像素点的总亮度值时，则将左边的像素点的总亮度值作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中R子像素的亮度值相加求平均后作为渲染后的R子像素的亮度值，将两个像素点的第一RGBW亮度值中G子像素的亮度值相加求平均后作为渲染后的G子像素的亮度值，将两个像素点的第一RGBW亮度值中B子像素的亮度值相加求平均后作为渲染后的B子像素的亮度值，得到第二RGBW亮度值。
本发明还提供了一种RGBW像素渲染方法，包括如下步骤：
步骤一S01、提取单元获取原始图像的每个像素点在RGB色彩空间的三基色分量的RGB灰阶值，并将RGB灰阶值发送至转换单元；
步骤二S02、转换单元将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元；
步骤三S03、采样单元将RGB的亮度值转换为第一RGBW亮度值并发送至渲染单元；
步骤四S04、判断单元按顺序两两一组，获取原始图像中每组的两个像素点的饱和度值和亮度值，并对饱和度值和亮度值分别进行相减计算得到饱和度差值和亮度差值，判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断得到判断结果后发送至渲染单元；
步骤五S05、渲染单元接收到判断结果后，根据判断结果对第一RGBW亮度值进行渲染得到渲染后的第二RGBW亮度值并发送至转换单元进行转换；
步骤六S06、转换单元将第二RGBW亮度值通过亮度转灰阶计算得到像素点的RGBW灰阶值后输出。
可选地，所述转换单元包括第一转换单元和第二转换单元；
提取单元将RGB灰阶值发送至转换单元后，由第一转换单元将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值后发送至采样单元；
所述渲染单元将渲染后的第二RGBW亮度值发送至转换单元后，由第二转换单元将第二RGBW亮度值通过亮度转灰阶计算得到像素点的RGBW灰阶值后输出。
可选地，所述步骤四S04中判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断的判断条件为：
判断每组的饱和度差值是否均小于第一阈值并且亮度差值是否均大于第二阈值，是则判断单元判断原始图像为文字模式，否则判断单元判断原始图像为图片模式。
可选地，所述判断结果为图片模式时，渲染单元将每组的两个像素点的第一RGBW亮度值中同类型的子像素的亮度值进行相加取平均的方法进行渲染，得到第二RGBW亮度值。
可选地，所述判断结果为文字模式时，渲染单元通过分别计算每组的两个像素点的第一RGBW亮度值的总亮度值，并对两个像素点的总亮度值进行判 断，从而得出相应的第二RGBW亮度值，所述像素点的总亮度值的计算采用以下公式：
Figure PCTCN2016113104-appb-000002
其中像素点的第一RGBW亮度值中包含四个子像素的亮度值，分别为Wn，Rn，Gn，Bn，n为像素点在原始图像中所在位置的位置数，Pn为像素点的总亮度值，通过上述计算公式得到像素点的总亮度值；
当每组的两个像素点中左边的像素点的总亮度值大于右边的像素点的总亮度值时，则通过将两个像素点的第一RGBW亮度值中W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值；
当左边的像素点的总亮度值小于右边的像素点的总亮度值时，则将左边的像素点的总亮度值作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中R子像素的亮度值相加求平均后作为渲染后的R子像素的亮度值，将两个像素点的第一RGBW亮度值中G子像素的亮度值相加求平均后作为渲染后的G子像素的亮度值，将两个像素点的第一RGBW亮度值中B子像素的亮度值相加求平均后作为渲染后的B子像素的亮度值，得到第二RGBW亮度值。
本发明与现有技术相比，通过获取原始图像的每个像素点在RGB色彩空间三基色分量的灰阶值并转化为RGB亮度值，并将RGB亮度值转换为RGBW亮度值后，根据不同的显示模式将其通过Gamma转换得到第二RGBW灰阶值后输出，保证显示器具有较高分辨率的前提下，显示细节不丢失，同时对于文字和图片进行了分别处理的。图片处理的结果是使得图片显示效果更加平滑，文字处理的结果是文字显示亮度增大，细节更加清晰。
附图说明
图1是本发明的RGBW渲染装置的结构框图；
图2是本发明的渲染方法的流程图；
图3是本发明图片模式下的像素渲染的示意图；
图4是本发明文字模式下的像素渲染的示意图。
具体实施方式
下面结合附图和实施例对本发明作进一步详细说明。
如图1所示，本发明的一种RGBW像素渲染装置，该渲染装置包括：
提取单元，用于获取原始图像的每个像素点在RGB色彩空间的三基色分量的RGB灰阶值，并将RGB灰阶值发送至转换单元；
转换单元，用于将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元，以及将第二RGBW亮度值通过亮度转灰阶计算得到像素点的RGBW灰阶值后输出；
采样单元，用于将RGB的亮度值转换为第一RGBW亮度值并发送至渲染单元；
判断单元，用于按顺序两两一组，获取原始图像中每组两个像素点的饱和度值和亮度值，并对饱和度值和亮度值分别进行相减计算得到饱和度差值和亮度差值，判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断得到判断结果后发送至渲染单元；
渲染单元，用于根据判断结果对第一RGBW亮度值进行渲染得到渲染后的第二RGBW亮度值并发送至转换单元进行转换。
可选地，本发明的转换单元包括第一转换单元和第二转换单元；
所述第一转换单元，用于将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元；
第二转换单元，用于将第二RGBW亮度值通过亮度转灰阶计算得到像素点的RGBW灰阶值后输出。
所述判断单元根据计算每组的两个像素点的饱和度差值和亮度差值进行 判断的判断条件为，判断每组的饱和度差值是否均小于第一阈值并且亮度差值是否均大于第二阈值，是则判断单元判断原始图像为文字模式，否则判断单元判断原始图像为图片模式，所述第一阈值为1.3，第二阈值为0.3。
所述判断结果为图片模式时，渲染单元将每组的两个像素点的第一RGBW亮度值中同类型的子像素的亮度值进行相加取平均的方法进行渲染，得到第二RGBW亮度值。
所述判断结果为文字模式时，渲染单元通过分别计算每组的两个像素点的第一RGBW亮度值的总亮度值，并对两个像素点的总亮度值进行判断，从而计算出相应的第二RGBW亮度值；
当每组的两个像素点中左边的像素点的总亮度值大于右边的像素点的总亮度值时，则通过将两个像素点的第一RGBW亮度值中W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值；
当每组的两个像素点中左边的像素点的总亮度值小于右边的像素点的总亮度值时，则将左边的像素点的总亮度值作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中R子像素的亮度值相加求平均后作为渲染后的R子像素的亮度值，将两个像素点的第一RGBW亮度值中G子像素的亮度值相加求平均后作为渲染后的G子像素的亮度值，将两个像素点的第一RGBW亮度值中B子像素的亮度值相加求平均后作为渲染后的B子像素的亮度值，得到第二RGBW亮度值。
如图2所示，本发明的一种RGBW像素渲染方法，包括如下步骤：
步骤一S01、提取单元获取原始图像的每个像素点在RGB色彩空间的三基色分量的RGB灰阶值，并将RGB灰阶值发送至转换单元；
步骤二S02、转换单元将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元；
步骤三S03、采样单元将RGB的亮度值转换为第一RGBW亮度值并发送至渲染单元；
步骤四S04、判断单元按顺序两两一组，获取原始图像中每组的两个像素点的饱和度值和亮度值，并对饱和度值和亮度值分别进行相减计算得到饱和度差值和亮度差值，判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断得到判断结果后发送至渲染单元；
步骤五S05、渲染单元接收到判断结果后，根据判断结果对第一RGBW亮度值进行渲染得到渲染后的第二RGBW亮度值并发送至转换单元进行转换；
步骤六S06、转换单元将第二RGBW亮度值通过亮度转灰阶计算，得到像素点的RGBW灰阶值后输出。
可选地，所述转换单元包括第一转换单元和第二转换单元；
提取单元将RGB灰阶值发送至转换单元后，由第一转换单元将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值后发送至采样单元；
所述渲染单元将渲染后的第二RGBW亮度值发送至转换单元后，由第二转换单元将第二RGBW亮度值通过亮度转灰阶计算得到像素点的RGBW灰阶值后输出。
所述步骤S04中判断单元根据计算每组的两个像素点的饱和度差值和亮度差值进行判断的判断条件为：
判断每组的饱和度差值是否均小于第一阈值并且亮度差值是否均大于第二阈值，是则判断单元判断原始图像为文字模式，否则判断单元判断原始图像为图片模式。
所述判断结果为图片模式时，渲染单元将每组的两个像素点的第一RGBW亮度值中同类型的子像素的亮度值进行相加取平均的方法进行渲染，得到第二RGBW亮度值。
所述判断结果为文字模式时，渲染单元通过分别计算每组的两个像素点的第一RGBW亮度值的总亮度值，并对两个像素点的总亮度值进行判断，从而得出相应的第二RGBW亮度值；
当每组的两个像素点中左边的像素点的总亮度值大于右边的像素点的总 亮度值时，则通过将两个像素点的第一RGBW亮度值中W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值；
当每组的两个像素点中左边的像素点的总亮度值小于右边的像素点的总亮度值时，则将左边的像素点的总亮度值作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中R子像素的亮度值相加求平均后作为渲染后的R子像素的亮度值，将两个像素点的第一RGBW亮度值中G子像素的亮度值相加求平均后作为选然后的G子像素的亮度值，将两个像素点的第一RGBW亮度值中B子像素的亮度值相加求平均后作为选然后的B子像素的亮度值，得到第二RGBW亮度值。
本发明中按照顺利两两一组具体为按照原始图像中像素点的位置，按照每行先后顺序，两个像素点作为一组，例如第一行中像素点的位置为1，2，3，4，5，6，7，8，……，那么，将第一行中，1和2位置上的像素点作为为一组，3和4位置上的像素点作为一组，5和6位置上的像素点作为一组，7和8位置上的像素点作为一组，依此类推。
本发明中判断结果为图片模式时，渲染单元通过将每组的两个像素点中同类型的子像素进行相加取平均的方法进行渲染，得到第二RGBW亮度值；
具体为，如图3所示，设每个像素点的第一RGBW亮度值中子像素的亮度值为(Wn，Rn，Gn，Bn)，其中n为像素点在原始图像中所在位置的位置数，这里取四个像素点进行举例说明，该四个像素点分别为(W1，R1，G1，B1)、(W2，R2，G2，B2)、(W3，R3，G3，B3)、(W4，R4，G4，B4)，通过公式：
Figure PCTCN2016113104-appb-000003
最终，分别得到了第二RGBW亮度值，这样做的结果是在图片显示模式 下，相邻像素之间的过渡更加平滑，对于图片显示，尤其是人像的显示效果更加理想(一些图片处理器中的美图功能就是利用了这种平滑的方式)。
本发明中判断结果为文字模式时，渲染单元通过判断相邻两个像素点的总亮度值的大小从而得出相应的第二RGBW亮度值；
具体为如图4所示，设像素点的第一RGBW亮度值中四个子像素的亮度值为(Wn，Rn，Gn，Bn)，其中n为像素点在原始图像中所在位置的位置数，Pn为像素点的总亮度值，计算公式如下：
Figure PCTCN2016113104-appb-000004
这里取四个像素点进行举例说明，该四个像素点的第一RGBW亮度值中四个子像素的亮度值分别为(W1，R1，G1，B1)、(W2，R2，G2，B2)、(W3，R3，G3，B3)、(W4，R4，G4，B4)，通过下列公式得到分别得到四个像素点的总亮度值Pn；
Figure PCTCN2016113104-appb-000005
若上述计算出的四个像素点中，按照顺序两两一组，左侧一组两个像素点中当左边的像素点的总亮度值P1大于右边的像素点的总亮度值P2时，则通过将两个像素点中的W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值，具体公式为：
Figure PCTCN2016113104-appb-000006
由于此时P1为亮，P2为暗，因此这样做的结果是使得亮暗差异更加明显，从而可以增强黑白文字的显示效果；
若上述计算出的四个像素点中，右侧的一组两个像素点中当左边的像素点的总亮度值P3小于右边的像素点的总亮度值P4时，则将左边的像素点的总亮度值P3作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中RGB三个子像素的亮度值分别相加求平均后分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值，具体公式为：
Figure PCTCN2016113104-appb-000007
由于此时P3为暗，P4为亮，因此这样做的结果是也是使得亮暗差异更加明显，从而可以增强黑白文字的显示效果。
在以上渲染过程中，大部分子像素讯息都得到了保留，只有一些亮度降低的子像素的讯息被丢弃，对于最终显示的细节状况影响较小。
值得注意的是，以上的文字模式的例子均以W在RGB子像素之前的像素排布方式进行说明，若出现W在RGB子像素之后的排列情况，则处理的方法正好相反；
若上述计算出的四个像素点中，按照顺序两两一组，左侧一组两个像素点中当左边的像素点的总亮度值P1小于右边的像素点的总亮度值P2时，则通过将两个像素点的第一RGBW亮度值中的W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值P2分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值，具体公式为：
Figure PCTCN2016113104-appb-000008
若上述计算出的四个像素点中，右侧的一组两个像素点中当左边的像素点的总亮度值P3大于右边的像素点的总亮度值P4时，则将左边的像素点的总亮度值P3作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中RGB三个子像素的亮度值分别相加求平均后分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值，具体公式为：
Figure PCTCN2016113104-appb-000009
本发明中灰阶转亮度(De-Gamma转换)和亮度转灰阶(Gamma转换)过程分别采用以下公式计算得到：
De-Gamma转换：y＝(x/255)gamma；
Gamma转换：
Figure PCTCN2016113104-appb-000010
其中上述公式中y为灰阶值，x为亮度值，gamma取2.2。
本发明中将RGB的亮度值转换为第一RGBW亮度值如下方式实现：
Figure PCTCN2016113104-appb-000011
其中，k为根据显示内容指定的增益系数，所述2.5≥k≥1。
本发明具有以下的优点：
(1)：由于采用了像素渲染的方法，可以在物理分辨率下降的情况下，保证实际分辨率不降低；
(2)：由于在像素渲染的过程中，所有的子像素讯息都基本得到了保留，因此不会带来显示细节的丢失；
(3)：本发明中针对不同的显示模式进行了判断，并对文字和图片两种模式分别进行了处理；
(4)：图片处理的结果是使得图片显示效果更加平滑，尤其是在人像显示方面；
(5)：文字处理的结果是文字显示黑白差距增大，细节更加锐化。
虽然已经参照特定实施例示出并描述了本发明，但是本领域的技术人员将理解：在不脱离由权利要求及其等同物限定的本发明的精神和范围的情况下，可在此进行形式和细节上的各种变化。

Claims (10)

  1. 一种RGBW像素渲染装置，其中：该渲染装置包括：
    提取单元，用于获取原始图像的每个像素点在RGB色彩空间的三基色分量的RGB灰阶值，并将RGB灰阶值发送至转换单元；
    转换单元，用于将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元，以及将第二RGBW亮度值通过亮度转灰阶计算得到像素单元的RGBW灰阶值后输出；
    采样单元，用于将RGB的亮度值转换为第一RGBW亮度值并发送至渲染单元；
    判断单元，用于按顺序两两一组，获取原始图像中每组两个像素点的饱和度值和亮度值，并对饱和度值和亮度值分别进行相减计算得到饱和度差值和亮度差值；根据每组的两个像素点的饱和度差值和亮度差值进行判断得到判断结果后发送至渲染单元；
    渲染单元，用于根据判断结果对第一RGBW亮度值进行渲染得到渲染后的第二RGBW亮度值并发送至转换单元进行转换。
  2. 根据权利要求1所述的RGBW像素渲染装置，其中：所述转换单元包括第一转换单元和第二转换单元；
    所述第一转换单元，用于将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值并发送至采样单元；
    第二转换单元，用于将第二RGBW亮度值通过亮度转灰阶计算得到像素单元的RGBW灰阶值后输出。
  3. 根据权利要求2所述的RGBW像素渲染装置，其中：所述判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断的判断条件为，判断每组的饱和度差值是否均小于第一阈值并且亮度差值是否均大于第二阈值，是则判断单元判断原始图像为文字模式，否则判断单元判断原始图像为图片模式。
  4. 根据权利要求3所述的RGBW像素渲染装置，其中：所述判断结果为图片模式时，渲染单元将每组的两个像素点的第一RGBW亮度值中同类型的子像素的亮度值进行相加取平均的方法进行渲染，得到第二RGBW亮度值。
  5. 根据权利要求3所述的RGBW像素渲染装置，其中：所述判断结果为文字模式时，渲染单元通过分别计算每组的两个像素点的第一RGBW亮度值的总亮度值，并对两个像素点的总亮度值进行判断，从而得出相应的第二RGBW亮度值，所述像素点的总亮度值的计算采用以下公式：
    Figure PCTCN2016113104-appb-100001
    其中像素点的第一RGBW亮度值中包含四个子像素的亮度值分别为Wn，Rn，Gn，Bn，n为像素点在原始图像中所在位置的位置数，Pn为像素单元的总亮度值，通过上述计算公式得到像素点的第一RGBW亮度值的总亮度值；
    当每组的两个像素点中左边的像素点的总亮度值大于右边的像素点的总亮度值时，则通过将两个像素点的第一RGBW亮度值中W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值；
    当左边的像素点的总亮度值小于右边的像素点的总亮度值时，则将左边的像素点的总亮度值作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中R子像素的亮度值相加求平均后作为渲染后的R子像素的亮度值，将两个像素点的第一RGBW亮度值中G子像素的亮度值相加求平均后作为渲染后的G子像素的亮度值，将两个像素点的第一RGBW亮度值中B子像素的亮度值相加求平均后作为渲染后的B子像素的亮度值，得到第二RGBW亮度值。
  6. 一种RGBW像素渲染方法，其中：包括如下步骤：
    步骤一S01、提取单元获取原始图像的每个像素点在RGB色彩空间的三基色分量的RGB灰阶值，并将RGB灰阶值发送至转换单元；
    步骤二S02、转换单元将RGB灰阶值通过灰阶转亮度计算得到RGB的亮 度值并发送至采样单元；
    步骤三S03、采样单元将RGB的亮度值转换为第一RGBW亮度值并发送至渲染单元；
    步骤四S04、判断单元按顺序两两一组，获取原始图像中每组的两个像素点的饱和度值和亮度值，并对饱和度值和亮度值分别进行相减计算得到饱和度差值和亮度差值，判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断得到判断结果后发送至渲染单元；
    步骤五S05、渲染单元接收到判断结果后，根据判断结果对第一RGBW亮度值进行渲染得到渲染后的第二RGBW亮度值并发送至转换单元进行转换；
    步骤六S06、转换单元将第二RGBW亮度值通过亮度转灰阶计算得到像素点的RGBW灰阶值后输出。
  7. 根据权利要求6所述的RGBW像素渲染方法，其中：所述转换单元包括第一转换单元和第二转换单元；
    提取单元将RGB灰阶值发送至转换单元后，由第一转换单元将RGB灰阶值通过灰阶转亮度计算得到RGB的亮度值后发送至采样单元；
    所述渲染单元将渲染后的第二RGBW亮度值发送至转换单元后，由第二转换单元将第二RGBW亮度值通过亮度转灰阶计算得到像素点的RGBW灰阶值后输出。
  8. 根据权利要求7所述的RGBW像素渲染方法，其中：所述步骤S04中判断单元根据每组的两个像素点的饱和度差值和亮度差值进行判断的判断条件为：
    判断每组的饱和度差值是否均小于第一阈值并且亮度差值是否均大于第二阈值，是则判断单元判断原始图像为文字模式，否则判断单元判断原始图像为图片模式。
  9. 根据权利要求8所述的RGBW像素渲染方法，其中：所述判断结果为图片模式时，渲染单元将每组的两个像素点的第一RGBW亮度值中同类型的 子像素的亮度值进行相加取平均的方法进行渲染，得到第二RGBW亮度值。
  10. 根据权利要求8所述的RGBW像素渲染方法，其中：所述判断结果为文字模式时，渲染单元通过分别计算每组的两个像素点的第一RGBW亮度值的总亮度值，并对两个像素点的总亮度值进行判断，从而得出相应的第二RGBW亮度值，所述像素点的总亮度值的计算采用以下公式：
    Figure PCTCN2016113104-appb-100002
    其中像素点的第一RGBW亮度值中包含四个子像素的亮度值，分别为Wn，Rn，Gn，Bn，n为像素点在原始图像中所在位置的位置数，Pn为像素点的总亮度值，通过上述计算公式得到像素点的总亮度值；
    当每组的两个像素点中左边的像素点的总亮度值大于右边的像素点的总亮度值时，则通过将两个像素点的第一RGBW亮度值中W子像素的亮度值相加求平均作为渲染后的W子像素的亮度值，而将右边的像素点的总亮度值分别作为渲染后的RGB三个子像素的亮度值，得到第二RGBW亮度值；
    当左边的像素点的总亮度值小于右边的像素点的总亮度值时，则将左边的像素点的总亮度值作为渲染后的W子像素的亮度值，将两个像素点的第一RGBW亮度值中R子像素的亮度值相加求平均后作为渲染后的R子像素的亮度值，将两个像素点的第一RGBW亮度值中G子像素的亮度值相加求平均后作为渲染后的G子像素的亮度值，将两个像素点的第一RGBW亮度值中B子像素的亮度值相加求平均后作为渲染后的B子像素的亮度值，得到第二RGBW亮度值。
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