WO2017193438A1 - 一种图像显示方法及显示装置 - Google Patents

一种图像显示方法及显示装置 Download PDF

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Publication number
WO2017193438A1
WO2017193438A1 PCT/CN2016/085460 CN2016085460W WO2017193438A1 WO 2017193438 A1 WO2017193438 A1 WO 2017193438A1 CN 2016085460 W CN2016085460 W CN 2016085460W WO 2017193438 A1 WO2017193438 A1 WO 2017193438A1
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Prior art keywords
value
grayscale value
white
grayscale
gray scale
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PCT/CN2016/085460
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English (en)
French (fr)
Inventor
赵文勤
何涛
何振伟
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深圳市华星光电技术有限公司
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Priority to US15/109,651 priority Critical patent/US10347198B2/en
Publication of WO2017193438A1 publication Critical patent/WO2017193438A1/zh

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Classifications

    • 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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/026—Control of mixing and/or overlay of colours in general
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/52—RGB geometrical arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/30—Gray scale
    • 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
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation

Definitions

  • the present invention relates to the field of liquid crystal display, and in particular to an image display method and a display device.
  • a pixel unit is composed of a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel, wherein the RGB three primary color data in the image to be displayed is controlled correspondingly.
  • the grayscale value of the sub-pixels is mixed with the color to be displayed to display the image.
  • the technical problem to be solved by the present invention is to provide an image display method and a display device capable of realizing normal display of a current image based on RGB three primary color data on a four-color display panel.
  • a technical solution adopted by the present invention is to provide an image display method, which comprises: acquiring three-color sub-pixel data of each pixel in a current image, and the three-color sub-pixel data includes a red first gray.
  • the first gray scale value R1, the green first gray scale value G1, the blue first gray scale value B1, and the white first gray scale value W1 perform color gamut matching to obtain a red second gray scale value R2 and a green second gray scale a value G2, a blue second grayscale value B2, and a white second grayscale value W2; a red second grayscale value R2, a green second grayscale value G2, a blue second grayscale value B2, a white second gray
  • the step value W2 performs sub-pixel rendering to obtain updated three
  • X2 X1*(Max(R1, G1, B1)+W1)/ Max (R1, G1, B1)-W1 obtains a red second grayscale value R2, a green second grayscale value G2, and a blue second grayscale value B2; wherein, X1 is a red first grayscale value R1, green a first gray scale value G1 and a blue first gray scale value B1, correspondingly, X2 is a red second gray scale value R2, a green second gray scale value G2, and a blue second gray scale value B2, respectively; Max (R1, G1, B1) is the maximum value of the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1; W1 is a white first grayscale value; wherein the white second grayscale value W2 is equal to the white first grayscale value W1.
  • the white first gray scale value W1 is calculated according to the following formula:
  • W1 Min(R1, G1, B1)-Min(R1, G1, B1)*RA_W;
  • W1 is a white first grayscale value
  • Min (R1, G1, B1) is a minimum value of a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1, RA_W It is a white gray scale coefficient.
  • the white gray scale coefficient becomes larger as the mean value increases.
  • the pixel points corresponding to the updated three-color sub-pixel data are arranged in the order of R3G3B3, W3R3G3, B3W3R3, and G3B3W3, wherein R3 represents a red third grayscale value, G3 represents a green third grayscale value, and B3 Indicates the blue third grayscale value and W3 represents the white third grayscale value.
  • the pixel corresponding to the updated three-color sub-pixel data is obtained according to the following method: acquiring a second gray-scale value corresponding to the missing color in the updated three-color sub-pixel data of the previous pixel, a first value; obtaining a second grayscale value corresponding to the color in the current pixel, and recording it as a second value; acquiring a third grayscale value of the color in the current pixel point according to the first value and the second value; the current pixel point The third grayscale value of the remaining color in the middle is equal to the second grayscale value of the corresponding color.
  • An image display method includes: acquiring three-color sub-pixel data of each pixel in a current image, where the three-color sub-pixel data includes a red first grayscale value R1, a green first grayscale value G1, and a blue color.
  • a gray scale value B1 obtaining a white gray scale coefficient according to the red first gray scale value R1, the green first gray scale value G1, and the blue first gray scale value B1; according to the white gray scale coefficient and the red first gray scale value R1
  • the minimum value of the green first grayscale value G1 and the blue first grayscale value B1 obtains a white first grayscale value W1; and the red first grayscale value R1 and the green first grayscale value G1 according to a predetermined rule
  • the blue first grayscale value B1 and the white first grayscale value W1 perform color gamut matching to obtain a red second grayscale value R2, a green second grayscale value G2, a blue second grayscale value B2, and a white second.
  • Gray-scale value W2 sub-pixel rendering for red second grayscale value R2, green second grayscale value G2, blue second grayscale value B2, white second grayscale value W2 to obtain update corresponding to each pixel
  • the subsequent three-color sub-pixel data is output to the display panel, and the updated three-color sub-pixel data includes a red third gray scale Any three of the value R3, the green third grayscale value G3, the blue third grayscale value B3, and the white third grayscale value W3.
  • the step of acquiring the white grayscale coefficient according to the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1 includes: obtaining a red first grayscale value R1 and a green first grayscale The maximum value and the minimum value of the value G1 and the blue first grayscale value B1; obtaining the difference between the maximum value and the minimum value; calculating the mean value of the difference corresponding to each pixel point in the current image; obtaining the average value according to the mean value by the table lookup method White gray scale factor.
  • the white first gray scale value W1 is calculated according to the following formula:
  • W1 Min(R1, G1, B1)-Min(R1, G1, B1)*RA_W;
  • W1 is a white first grayscale value
  • Min (R1, G1, B1) is a minimum value of a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1, RA_W It is a white gray scale coefficient.
  • the white gray scale coefficient becomes larger as the mean value increases.
  • X2 X1*(Max(R1, G1, B1)+W1)/ Max (R1, G1, B1)-W1 obtains a red second grayscale value R2, a green second grayscale value G2, and a blue second grayscale value B2; wherein, X1 is a red first grayscale value R1, green a first gray scale value G1 and a blue first gray scale value B1, correspondingly, X2 is a red second gray scale value R2, a green second gray scale value G2, and a blue second gray scale value B2, respectively; Max (R1, G1, B1) is the maximum value of the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1; W1 is a white first grayscale value; wherein the white second grayscale value W2 is equal to the white first grayscale value W1.
  • the pixel points corresponding to the updated three-color sub-pixel data are arranged in the order of R3G3B3, W3R3G3, B3W3R3, and G3B3W3, wherein R3 represents a red third grayscale value, G3 represents a green third grayscale value, and B3 Indicates the blue third grayscale value and W3 represents the white third grayscale value.
  • the pixel corresponding to the updated three-color sub-pixel data is obtained according to the following method: acquiring a second gray-scale value corresponding to the missing color in the updated three-color sub-pixel data of the previous pixel, a first value; obtaining a second grayscale value corresponding to the color in the current pixel, and recording it as a second value; acquiring a third grayscale value of the color in the current pixel point according to the first value and the second value; the current pixel point The third grayscale value of the remaining color in the middle is equal to the second grayscale value of the corresponding color.
  • an image display device comprising: a white first grayscale value acquiring unit, configured to receive three color sub-pixels of each pixel in the current image.
  • the three-color sub-pixel data includes a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1; according to the red first grayscale value R1, the green first grayscale value G1, and The blue first gray scale value B1 obtains a white gray scale coefficient; and obtains white according to a white gray scale coefficient and a minimum value of a red first gray scale value R1, a green first gray scale value G1, and a blue first gray scale value B1.
  • a color gamut matching unit connected to the white first grayscale value acquiring unit, configured to pair the red first grayscale value R1, the green first grayscale value G1, and the blue first gray according to a predetermined rule
  • the order value B1 and the white first gray scale value W1 perform color gamut matching to obtain a red second gray scale value R2, a green second gray scale value G2, a blue second gray scale value B2, and a white second gray scale value W2; a sub-pixel rendering unit connected to the gamut matching unit for obtaining the gamut matching unit
  • the red second grayscale value R2, the green second grayscale value G2, the blue second grayscale value B2, and the white second grayscale value W2 are sub-pixel rendered to obtain the updated three-color sub-pixel corresponding to each pixel.
  • the pixel data is output to the display panel, and the updated three-color sub-pixel data includes a red third grayscale value R3, a green third grayscale value G3, a blue third grayscale value B3, and a white third grayscale value W3. Any three of them.
  • the operation of the white first grayscale value acquiring unit acquiring the white grayscale coefficient according to the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1 includes: acquiring the red first grayscale a maximum value and a minimum value of the value R1, the green first grayscale value G1, and the blue first grayscale value B1; obtaining a difference between the maximum value and the minimum value; and calculating a mean value of the difference values corresponding to each pixel point in the current image According to the mean value, the white gray scale coefficient is obtained by the look-up table method.
  • the white first gray scale value W1 is calculated according to the following formula:
  • W1 Min(R1, G1, B1)-Min(R1, G1, B1)*RA_W;
  • W1 is a white first grayscale value
  • Min (R1, G1, B1) is a minimum value of a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1, RA_W It is a white gray scale coefficient.
  • the white gray scale coefficient becomes larger as the mean value increases.
  • gamut matching unit is based on the formula:
  • X2 X1*(Max(R1, G1, B1)+W1)/ Max (R1, G1, B1)-W1 obtains a red second grayscale value R2, a green second grayscale value G2, and a blue second grayscale value B2; wherein, X1 is a red first grayscale value R1, green a first gray scale value G1 and a blue first gray scale value B1, correspondingly, X2 is a red second gray scale value R2, a green second gray scale value G2, and a blue second gray scale value B2, respectively; Max (R1, G1, B1) is the maximum value of the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1; W1 is a white first grayscale value; wherein the white second grayscale value W2 is equal to the white first grayscale value W1.
  • the pixel points corresponding to the updated three-color sub-pixel data are arranged in the order of R3G3B3, W3R3G3, B3W3R3, and G3B3W3, wherein R3 represents a red third grayscale value, G3 represents a green third grayscale value, and B3 represents blue.
  • R3 represents a red third grayscale value
  • G3 represents a green third grayscale value
  • B3 represents blue.
  • W3 represent the third gray scale value of white.
  • the operation of the sub-pixel rendering unit to acquire the pixel point corresponding to the updated three-color sub-pixel data includes: acquiring the second gray-scale value corresponding to the missing color in the three-color sub-pixel data after the previous pixel point update, a first value; obtaining a second grayscale value corresponding to the color in the current pixel, and recording the second value; acquiring a third grayscale value of the color in the current pixel according to the first value and the second value; the current pixel The third grayscale value of the remaining color in the point is equal to the second grayscale value of the corresponding color.
  • the invention has the beneficial effects that the image display method and the display device of the present invention firstly obtain the white sub-pixel gray in the process of converting the RGB three-color sub-pixel data into the updated three-color sub-pixel data adapted to the four-color panel. Order value, Then, the gamut matching is performed on the four-color sub-pixel data, and finally the four-color sub-pixel data is sub-pixel rendered to obtain the updated three-color sub-pixel data corresponding to each pixel and output to the display panel.
  • the present invention can process the RGB three primary color data in the current image to obtain image data suitable for display by the four-color display panel, thereby realizing vivid display of the current image on the four-color display panel.
  • FIG. 1 is a schematic flow chart of a flow chart of an image display method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing a white gray scale coefficient and a mean value according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram showing the arrangement of pixels of the output to the display panel according to the first embodiment of the present invention
  • FIG. 4 is a schematic view showing the arrangement of pixels of the output to the display panel according to the second embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an image display device according to an embodiment of the present invention.
  • FIG. 1 is a flow chart showing a schematic flow chart of an image display method according to an embodiment of the present invention. It should be noted that the method of the present invention is not limited to the sequence of the flow shown in FIG. 1 if substantially the same result is obtained. As shown in FIG. 1, the method includes the following steps:
  • Step S101 Acquire three-color sub-pixel data of each pixel in the current image, and the three-color sub-pixel data includes a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1.
  • Step S102 Acquire white grayscale coefficients according to the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1.
  • step S102 the operation of acquiring the white grayscale coefficient according to the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1 includes: acquiring the red first grayscale value R1, the green first a maximum value and a minimum value of a gray scale value G1 and a blue first gray scale value B1; obtaining a difference between the maximum value and the minimum value; calculating an average value of the difference values corresponding to each pixel point in the current data frame; Check the table method to obtain the white gray scale coefficient.
  • FIG. 2 is a schematic diagram of a white gray scale coefficient and a mean value according to an embodiment of the present invention.
  • the horizontal axis represents the mean value, and the value ranges from 0 to 255
  • the vertical axis represents the white gray scale coefficient, and the value ranges from 0 to 1, wherein the white gray scale coefficient increases with the mean value. Become bigger.
  • the difference between the maximum value and the minimum value of the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1 is compared Large, so that the white gray scale coefficient is small.
  • the difference between the maximum value and the minimum value in the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1 is larger, thereby Make the white gray scale coefficient larger.
  • Step S103 Acquire a white first grayscale value W1 according to a minimum value among the white grayscale coefficient and the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1.
  • step S103 the white first grayscale value W1 is calculated according to the following formula:
  • W1 Min(R1, G1, B1)-Min(R1, G1, B1)*RA_W;
  • W1 is a white first grayscale value
  • Min (R1, G1, B1) is a minimum value of a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1, RA_W It is a white gray scale coefficient.
  • the white gray scale coefficient when the current data frame indicates that the image is close to a monochrome picture, the white gray scale coefficient is small, so that the white first gray scale value is large.
  • the white grayscale coefficient is large, so that the white first grayscale value is small. In this way, the brightness of the mixed color picture can be improved, and the white component of the monochrome picture can be reduced, thereby ensuring that the saturation of the color of the monochrome picture is not affected.
  • Step S104 performing gamut matching on the red first grayscale value R1, the green first grayscale value G1, the blue first grayscale value B1, and the white first grayscale value W1 according to a predetermined rule to obtain a red second grayscale The value R2, the green second grayscale value G2, the blue second grayscale value B2, and the white second grayscale value W2.
  • step S104 in the present embodiment, the second grayscale values of red, green, and blue are calculated according to the following formula:
  • X2 X1*(Max(R1, G1, B1)+W1)/ Max(R1, G1, B1)-W1
  • X1 is a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1, respectively
  • X2 is a red second grayscale value R2 and a green second grayscale value respectively.
  • Max (R1, G1, B1) is the maximum value of the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1;
  • W1 is the white first grayscale value.
  • the white second gray scale value W2 is equal to the white first gray scale value W1.
  • the first gray scale value needs to be gamut-matched according to a predetermined rule to obtain a matched red second gray scale value R2, a green second gray scale value G2, and a blue second gray scale value B2.
  • the predetermined rule may be other rules than the above formula, and the present invention is not limited to the rules represented by the above formula.
  • Step S105 Perform sub-pixel rendering on the red second grayscale value R2, the green second grayscale value G2, the blue second grayscale value B2, and the white second grayscale value W2 to obtain the updated corresponding to each pixel point.
  • the three-color sub-pixel data is output to the display panel.
  • the updated three-color sub-pixel data includes any three of a red third grayscale value R3, a green third grayscale value G3, a blue third grayscale value B3, and a white third grayscale value W3.
  • each pixel point outputted to the display panel of the present invention includes only three sub-pixel points, the red second gray scale value R2, the green second gray scale value G2, and the blue second cannot be directly directly.
  • the grayscale value B2 and the white second grayscale value W2 are directly output to the display panel, and the above four second grayscale values need to be rendered to obtain updated three-color sub-pixel data corresponding to each pixel.
  • FIG. 3 is a schematic diagram showing the arrangement of pixels of the output to the display panel according to the first embodiment of the present invention.
  • the pixel points corresponding to the updated three-color sub-pixel data are arranged in the order of R3G3B3, W3R3G3, B3W3R3, and G3B3W3, wherein R3 represents a red third grayscale value, and G3 represents a green third grayscale value, B3 represents a blue third grayscale value, and W3 represents a white third grayscale value.
  • the pixel corresponding to the updated three-color sub-pixel data is obtained according to the following method: acquiring a second gray-scale value corresponding to the missing color in the three-color sub-pixel data of the previous pixel, and recording the first value; The second grayscale value corresponding to the color in the current pixel is recorded as the second value; the third grayscale value of the color in the current pixel is obtained according to the first value and the second value; the remaining color of the current pixel The third grayscale value is equal to the second grayscale value of the corresponding color.
  • the current pixel includes white, red, and green
  • the previous pixel includes red, green, and blue
  • the white third grayscale value W3 of the current pixel is obtained according to the white second grayscale value W21 of the previous pixel and the white second grayscale value W22 of the current pixel.
  • W3 Ral1* W21+ ral2* W22, ral1 and ral2 are constants. That is to say, the previous pixel has no white, so the white of the previous pixel needs white rendering of the current pixel.
  • the red third grayscale value R3 of the current pixel point is equal to the red second grayscale value R2, and the green third grayscale value G3 of the current pixel point is equal to the green second grayscale value G2.
  • FIG. 4 is a schematic diagram showing the arrangement of pixels of the output to the display panel according to the second embodiment of the present invention.
  • each pixel of the odd-numbered row corresponding to the updated three-color sub-pixel data is arranged in the order of R3G3B3, W3R3G3, B3W3R3, and G3B3W
  • each pixel of the even-numbered row corresponds to the updated three-color sub-pixel.
  • the pixels of the even-numbered rows of the pixel data are arranged in the order of G3B3W3, R3G3B3, W3R3G3, and B3W3R3.
  • R3 represents a red third grayscale value
  • G3 represents a green third grayscale value
  • B3 represents a blue third grayscale value
  • W3 represents a white third grayscale value.
  • the method for acquiring the pixel points corresponding to the updated three-color sub-pixel data is similar to the first embodiment shown in FIG. 3, and is not described herein for the sake of brevity.
  • FIG. 5 is a schematic structural diagram of an image display device according to an embodiment of the present invention. As shown in FIG. 5, the image display device includes a white first grayscale value acquiring unit 21, a color gamut matching unit 22, and a subpixel rendering unit 23.
  • the white first grayscale value acquiring unit 21 is configured to receive three color sub-pixel data of each pixel in the current image, where the three-color sub-pixel data includes a red first grayscale value R1, a green first grayscale value G1, and a blue color a gray scale value B1; obtaining a white gray scale coefficient according to the red first gray scale value R1, the green first gray scale value G1, and the blue first gray scale value B1; according to the white gray scale coefficient and the red first gray scale value R1 The minimum value of the green first grayscale value G1 and the blue first grayscale value B1 obtains the white first grayscale value W1.
  • the operation of the white first grayscale value acquiring unit 21 acquiring the white grayscale coefficient according to the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1 includes: acquiring the red color a maximum value and a minimum value of a grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1; obtaining a difference between the maximum value and the minimum value; calculating a difference corresponding to each pixel point of the current image frame
  • the mean value of the value; the white gray scale coefficient is obtained by the look-up table method according to the mean value.
  • the white gray scale coefficient becomes larger as the mean value increases.
  • the white first gray scale value W1 is calculated according to the following formula:
  • W1 Min(R1, G1, B1)-Min(R1, G1, B1)*RA_W;
  • W1 is a white first grayscale value
  • Min (R1, G1, B1) is a minimum value of a red first grayscale value R1, a green first grayscale value G1, and a blue first grayscale value B1, RA_W It is a white gray scale coefficient.
  • the gamut matching unit 22 is connected to the white first grayscale value acquiring unit 21 for aligning the red first grayscale value R1, the green first grayscale value G1, the blue first grayscale value B1, and the white number according to a predetermined rule.
  • a gray scale value W1 performs color gamut matching to obtain a red second gray scale value R2, a green second gray scale value G2, a blue second gray scale value B2, and a white second gray scale value W2.
  • the gamut matching unit 22 is based on the formula:
  • X2 X1*(Max(R1, G1, B1)+W1)/ Max (R1, G1, B1)-W1 obtains a red second grayscale value R2, a green second grayscale value G2, and a blue second grayscale value B2; wherein, X1 is a red first grayscale value R1, green a first gray scale value G1 and a blue first gray scale value B1, correspondingly, X2 is a red second gray scale value R2, a green second gray scale value G2, and a blue second gray scale value B2, respectively; Max (R1, G1, B1) is the maximum value of the red first grayscale value R1, the green first grayscale value G1, and the blue first grayscale value B1; W1 is the white first grayscale value.
  • the white second gray scale value W2 is equal to the white first gray scale value W1.
  • the sub-pixel rendering unit 23 is connected to the color gamut matching unit 22 for the red second grayscale value R2, the green second grayscale value G2, the blue second grayscale value B2, and the white color acquired by the color gamut matching unit 22.
  • the second gray scale value W2 performs sub-pixel rendering to obtain updated three-color sub-pixel data corresponding to each pixel point and output to the display panel.
  • the updated three-color sub-pixel data includes any three of a red third grayscale value R3, a green third grayscale value G3, a blue third grayscale value B3, and a white third grayscale value W3.
  • each pixel corresponding to the updated three-color sub-pixel is arranged in the order of R3G3B3, W3R3G3, B3W3R3, and G3B3W3, wherein R3 represents a red third grayscale value, and G3 represents a green color.
  • the third gray scale value, B3 represents the blue third gray scale value
  • W3 represents the white third gray scale value.
  • the operation of the sub-pixel rendering unit 23 to acquire the pixel points corresponding to the updated three-color sub-pixel data includes: acquiring a second gray-scale value corresponding to the missing color in the three-color sub-pixel data of the previous pixel, a first value; obtaining a second grayscale value corresponding to the color in the current pixel, and recording it as a second value; acquiring a third grayscale value of the color in the current pixel point according to the first value and the second value; the current pixel point The third grayscale value of the remaining color in the middle is equal to the second grayscale value of the corresponding color.
  • the invention has the beneficial effects that the image display method and the display device of the present invention firstly obtain the white sub-pixel gray in the process of converting the RGB three-color sub-pixel data into the updated color three-color sub-pixel data adapted to the four-color panel. Order value, Then, the gamut matching is performed on the four-color sub-pixel data, and finally the four-color sub-pixel data is sub-pixel rendered to obtain the updated three-color sub-pixel data corresponding to each pixel and output to the display panel.
  • the present invention can ensure that the white sub-pixel does not lower the color gamut, satisfies the brightness requirement of the image, and achieves a more vivid and realistic display of the image.
  • the present invention can realize image display with high transmittance and low power consumption.

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Abstract

一种图像显示方法及显示装置。该方法包括：获取当前图像中各像素点的三色子像素数据，三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；根据三色子像素数据获取白色第一灰阶值W1；按照预定规则对四色第一灰阶值进行色域匹配；对进行色域匹配后的四色第一灰阶值进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板。通过上述方式，能够对当前图像中的RGB三原色数据进行处理以得到适应四色显示面板显示的图像数据，进而实现当前图像在四色显示面板上生动逼真的显示。

Description

一种图像显示方法及显示装置
【技术领域】
本发明涉及液晶显示领域，特别是涉及一种图像显示方法及显示装置。
【背景技术】
目前，在液晶显示面板中，均是以红色（R）子像素、绿色（G）子像素和蓝色（B）子像素组成一个像素单元，其中，待显示的图像中的RGB三原色数据控制对应的子像素的灰阶值，混合出所需要显示的色彩来显示图像。随着液晶技术的发展，对于显示面板的各种需求也在增加，高透过率、低功耗、成像质量佳也成为人们对显示面板的需求。现有的RGB三原色混光显示方式的穿透率低、功耗大，制约了显示面板的产品优化。
基于此，出现了新一代包含红、绿、蓝、白的四色显示面板，白色子像素的加入一方面提高了显示面板的穿透率，一方面在达到相同的亮度的情况下，可以为背光源节省灯芯的数量，降低功耗。
因此如何对待显示的图像中的RGB三原色数据进行处理以得到适应四色显示面板显示的图像数据，进而实现在四色显示面板上对图像生动逼真的显示是一个亟待解决的问题。
【发明内容】
本发明主要解决的技术问题是提供一种图像显示方法及显示装置，能够实现基于RGB三原色数据的当前图像在四色显示面板上的正常显示。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种图像显示方法，该方法包括：获取当前图像中各像素点的三色子像素数据，三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数；根据白色灰阶系数和红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1；按照预定规则对红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1、白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2；对红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2、白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板，更新后的三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者；其中，其中，根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数的步骤包括：获取红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值和最小值；获取最大值和最小值的差值；计算当前图像中各像素点对应的差值的均值；根据均值通过查表法获取白色灰阶系数；其中，根据公式：
X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1获取红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2；其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值；其中，白色第二灰阶值W2等于白色第一灰阶值W1。
其中，白色第一灰阶值W1根据如下公式进行计算：
W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
其中，白色灰阶系数随着均值的增大而变大。
其中，对应于更新后的三色子像素数据的所述像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3的顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
其中，对应于更新后的三色子像素数据的所述像素点根据如下方式获：获取前一像素点的更新后的三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；获取当前像素点中对应该颜色的第二灰阶值，记为第二值；根据第一值和第二值获取当前像素点中该颜色的第三灰阶值；当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
为解决上述技术问题，本发明采用的另一个技术方案是： 提供一种图像显示方法，该方法包括：获取当前图像中各像素点的三色子像素数据，三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数；根据白色灰阶系数和红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1；按照预定规则对红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1、白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2；对红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2、白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板，更新后的三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者。
其中，根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数的步骤包括：获取红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值和最小值；获取最大值和最小值的差值；计算当前图像中各像素点对应的差值的均值；根据均值通过查表法获取白色灰阶系数。
其中，白色第一灰阶值W1根据如下公式进行计算：
W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
其中，白色灰阶系数随着均值的增大而变大。
其中，根据公式：
X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1获取红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2；其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值；其中，白色第二灰阶值W2等于白色第一灰阶值W1。
其中，对应于更新后的三色子像素数据的所述像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3的顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
其中，对应于更新后的三色子像素数据的所述像素点根据如下方式获：获取前一像素点的更新后的三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；获取当前像素点中对应该颜色的第二灰阶值，记为第二值；根据第一值和第二值获取当前像素点中该颜色的第三灰阶值；当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
为解决上述技术问题，本发明采用的再一个技术方案是：提供一种图像显示装置，该装置包括：白色第一灰阶值获取单元，用于接收当前图像中各像素点的三色子像素数据，三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数；根据白色灰阶系数和红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1；色域匹配单元，与白色第一灰阶值获取单元连接，用于按照预定规则对红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1和白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2；子像素渲染单元，与色域匹配单元连接，用于对色域匹配单元获取的红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2、白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板，更新后的三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者。
其中，白色第一灰阶值获取单元根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数的操作包括：获取红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值和最小值；获取最大值和最小值的差值；计算当前图像中各像素点对应的差值的均值；根据均值通过查表法获取白色灰阶系数。
其中，白色第一灰阶值W1根据如下公式进行计算：
W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
其中，白色灰阶系数随着均值的增大而变大。
其中，色域匹配单元根据公式：
X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1获取红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2；其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值；其中，白色第二灰阶值W2等于白色第一灰阶值W1。
其中，对应于更新后的三色子像素数据的像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3的顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
其中，子像素渲染单元获取对应于更新后的三色子像素数据的像素点的操作包括：获取前一像素点更新后的三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；获取当前像素点中对应该颜色的第二灰阶值，记为第二值；根据第一值和第二值获取当前像素点中该颜色的第三灰阶值；当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
本发明的有益效果是：本发明的图像显示方法及显示装置在将RGB三色子像素数据转换为适应于四色面板的更新后的三色子像素数据的过程中，首先获取白色子像素灰阶值， 接着对四色子像素数据进行色域匹配，最后对四色子像素数据进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板。通过上述方式，本发明能够对当前图像中的RGB三原色数据进行处理以得到适应四色显示面板显示的图像数据，进而实现当前图像在四色显示面板上生动逼真的显示。
【附图说明】
图1是本发明实施例的图像显示方法的流程示意图的流程示意图；
图2是本发明实施例的白色灰阶系数和均值的曲线示意图；
图3是本发明第一实施例的输出至显示面板的各像素点的排列示意图；
图4是本发明第二实施例的输出至显示面板的各像素点的排列示意图；
图5是本发明实施例的图像显示装置的结构示意图。
【具体实施方式】
在说明书及权利要求书当中使用了某些词汇来指称特定的组件，所属领域中的技术人员应可理解，制造商可能会用不同的名词来称呼同样的组件。本说明书及权利要求书并不以名称的差异来作为区分组件的方式，而是以组件在功能上的差异来作为区分的基准。下面结合附图和实施例对本发明进行详细说明。
图1是本发明实施例的图像显示方法的流程示意图的流程示意图。需注意的是，若有实质上相同的结果，本发明的方法并不以图1所示的流程顺序为限。如图1所示，该方法包括如下步骤：
步骤S101：获取当前图像中各像素点的三色子像素数据，三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1。
步骤S102：根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数。
在步骤S102中，根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数的操作包括：获取红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值和最小值；获取最大值和最小值的差值；计算当前数据帧中各像素点对应的差值的均值；根据均值通过查表法获取白色灰阶系数。
请一并参考图2，图2是本发明实施例的白色灰阶系数和均值的曲线示意图。如图2所示，横轴表示均值，其取值范围为0到255，纵轴表示白色灰阶系数，其取值范围为0到1，其中，白色灰阶系数随着均值的增大而变大。
其中，当当前数据帧指示图像接近单色画面时，则红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值和最小值的差值较大，从而使得白色灰阶系数较小。当当前数据帧指示图像接近混色画面时，则红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值和最小值的差值较大，从而使得白色灰阶系数较大。
本领域的技术人员可以理解，图2所示的白色灰阶系数和均值的曲线仅为举例，本发明不以此为限。
步骤S103：根据白色灰阶系数和红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1。
在步骤S103中，白色第一灰阶值W1根据如下公式进行计算：
W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
其中，当当前数据帧指示图像接近单色画面时，白色灰阶系数较小，从而使得白色第一灰阶值较大。当当前数据帧指示图像接近混色画面时，白色灰阶系数较大，从而使得白色第一灰阶值较小。通过这种方式，既可以提高混色画面的亮度，又可以降低单色画面的白色分量，从而保证单色画面的颜色的饱和度不受影响。
步骤S104：按照预定规则对红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1和白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2。
在步骤S104中，在本实施例中，红色、绿色和蓝色的第二灰阶值根据如下公式进行计算：
X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1
其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值。
在本实施例中，白色第二灰阶值W2等于白色第一灰阶值W1。
本领域的技术人员可以理解，由于白色的加入，如果对红色、绿色和蓝色对应的第一灰阶值（R1、G1、B1）不进行任何处理，则会出现色域降低的问题，因此需要按照预定规则对上述第一灰阶值进行色域匹配，以得到匹配后的红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2。
本领域的技术人员可以理解，预定规则可以为不同于上述公式的其它规则，本发明不以上述公式所代表的规则为限。
步骤S105：对红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2、白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板。
在步骤S105中，更新后的三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者。
本领域的技术人员可以理解，由于本发明输出至显示面板的各像素点仅仅包括三个子像素点，因此不能直接将红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2、白色第二灰阶值W2直接输出至显示面板，而需要将上述四个第二灰阶值进行渲染，从而得到对应各像素点的更新后的三色子像素数据。
请一并参考图3，图3是本发明第一实施例的输出至显示面板的各像素点的排列示意图。如图3所示，对应于更新后的三色子像素数据的像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
其中，对应于更新后的三色子像素数据的像素点根据如下方式获得：获取前一像素点的三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；获取当前像素点中对应该颜色的第二灰阶值，记为第二值；根据第一值和第二值获取当前像素点中该颜色的第三灰阶值；当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
举例来说，假设当前像素点包括白色、红色和绿色，前一像素点包括红色、绿色和蓝色，也即当前像素点为W3R3G3，前一像素点为R3G3B3。则由于前一像素点缺失白色，所以当前像素点的白色第三灰阶值W3根据前一像素点的白色第二灰阶值W21和当前像素点的白色第二灰阶值W22得到，其中，W3= ral1* W21+ ral2* W22，ral1和ral2为常数。也就是说，前一个像素点没有白色，所以前一个像素点的白色需要当前像素点的白色来渲染。当前像素点的红色第三灰阶值R3等于红色第二灰阶值R2，当前像素点的绿色第三灰阶值G3等于绿色第二灰阶值G2。
请一并参考图4，图4是本发明第二实施例的输出至显示面板的各像素点的排列示意图。如图4所示，对应于更新后的三色子像素数据的奇数行的各像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W的顺序进行排列，偶数行的各像素点对应于更新后的三色子像素数据的偶数行的各像素点按照G3B3W3、R3G3B3、W3R3G3、B3W3R3的顺序进行排列。其中，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
其中，对应于更新后的三色子像素数据的各像素点的获取方法与图3所示的第一实施例类似，为简约起见，在此不再赘述。
图5是本发明实施例的图像显示装置的结构示意图。如图5所示，该图像显示装置包括白色第一灰阶值获取单元21、色域匹配单元22和子像素渲染单元23。
白色第一灰阶值获取单元21用于接收当前图像中各像素点的三色子像素数据，三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数；根据白色灰阶系数和红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1。
具体来说，白色第一灰阶值获取单元21根据红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1获取白色灰阶系数的操作包括：获取红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值和最小值；获取最大值和最小值的差值；计算当前图像帧各像素点对应的差值的均值；根据均值通过查表法获取白色灰阶系数。
其中，白色灰阶系数随着均值的增大而变大。
其中，白色第一灰阶值W1根据如下公式进行计算：
W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
色域匹配单元22与白色第一灰阶值获取单元21连接，用于按照预定规则对红色第一灰阶值R1、绿色第一灰阶值G1、蓝色第一灰阶值B1和白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2。
具体来说，色域匹配单元22根据公式：
X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1获取红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2；其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值。
另外，白色第二灰阶值W2等于白色第一灰阶值W1。
子像素渲染单元23与色域匹配单元22连接，用于对色域匹配单元22获取的红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2、白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板。
其中，更新后的三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者。具体来说，在本实施例中，对应于更新后的三色子像素的各像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3的顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
其中，子像素渲染单元23获取对应于更新后的三色子像素数据的像素点的操作包括：获取前一像素点的三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；获取当前像素点中对应该颜色的第二灰阶值，记为第二值；根据第一值和第二值获取当前像素点中该颜色的第三灰阶值；当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
本发明的有益效果是：本发明的图像显示方法及显示装置在将RGB三色子像素数据转换为适应于四色面板的更新后色三色子像素数据的过程中，首先获取白色子像素灰阶值， 接着对四色子像素数据进行色域匹配，最后对四色子像素数据进行子像素渲染以获取各像素点对应的更新后的三色子像素数据并输出至显示面板。通过上述方式，本发明能够保证白色子像素不降低色域的情况下，满足图像的亮度要求，达到对图像更加生动逼真的显示。另外，本发明能够实现高穿透率、低功耗的图像显示。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (19)

  1. 一种图像显示方法，其中，所述方法包括：
    获取当前图像中各像素点的三色子像素数据，所述三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；
    根据所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1获取白色灰阶系数；
    根据所述白色灰阶系数和所述红色第一灰阶值R1、所述绿色第一灰阶值G1、所述蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1；
    按照预定规则对所述红色第一灰阶值R1、所述绿色第一灰阶值G1、所述蓝色第一灰阶值B1和所述白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2；
    对所述红色第二灰阶值R2、所述绿色第二灰阶值G2、所述蓝色第二灰阶值B2、所述白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的所述三色子像素数据并输出至显示面板，更新后的所述三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者；
    其中，所述根据所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1获取白色灰阶系数的步骤包括：
    获取所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1中的最大值和最小值；
    获取所述最大值和所述最小值的差值；
    计算所述当前图像中各像素点对应的所述差值的均值；
    根据所述均值通过查表法获取所述白色灰阶系数；
    其中，根据公式：
    X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1获取所述红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2；
    其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值；
    其中，白色第二灰阶值W2等于白色第一灰阶值W1。
  2. 根据权利要求1所述的方法，其中，所述白色第一灰阶值W1根据如下公式进行计算：
    W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
    其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
  3. 根据权利要求2所述的方法，其中，所述白色灰阶系数随着所述均值的增大而变大。
  4. 根据权利要求1所述的方法，其中，对应于更新后的所述三色子像素数据的所述像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3的顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
  5. 根据权利要求4所述的方法，其中，对应于更新后的所述三色子像素数据的所述像素点根据如下方式获得：
    获取前一像素点的更新后的所述三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；
    获取当前像素点中对应该颜色的第二灰阶值，记为第二值；
    根据所述第一值和所述第二值获取所述当前像素点中该颜色的第三灰阶值；
    所述当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
  6. 一种图像显示方法，其中，所述方法包括：
    获取当前图像中各像素点的三色子像素数据，所述三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；
    根据所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1获取白色灰阶系数；
    根据所述白色灰阶系数和所述红色第一灰阶值R1、所述绿色第一灰阶值G1、所述蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1；
    按照预定规则对所述红色第一灰阶值R1、所述绿色第一灰阶值G1、所述蓝色第一灰阶值B1和所述白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2；
    对所述红色第二灰阶值R2、所述绿色第二灰阶值G2、所述蓝色第二灰阶值B2、所述白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的所述三色子像素数据并输出至显示面板，更新后的所述三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者。
  7. 根据权利要求6所述的方法，其中，所述根据所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1获取白色灰阶系数的步骤包括：
    获取所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1中的最大值和最小值；
    获取所述最大值和所述最小值的差值；
    计算所述当前图像中各像素点对应的所述差值的均值；
    根据所述均值通过查表法获取所述白色灰阶系数。
  8. 根据权利要求7所述的方法，其中，所述白色第一灰阶值W1根据如下公式进行计算：
    W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
    其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
  9. 根据权利要求8所述的方法，其中，所述白色灰阶系数随着所述均值的增大而变大。
  10. 根据权利要求6所述的方法，其中，根据公式：
    X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1获取所述红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2；
    其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值；
    其中，白色第二灰阶值W2等于白色第一灰阶值W1。
  11. 根据权利要求6所述的方法，其中，对应于更新后的所述三色子像素数据的所述像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3的顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值
  12. 根据权利要求11所述的方法，其中，对应于更新后的所述三色子像素数据的所述像素点根据如下方式获得：
    获取前一像素点的更新后的所述三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；
    获取当前像素点中对应该颜色的第二灰阶值，记为第二值；
    根据所述第一值和所述第二值获取所述当前像素点中该颜色的第三灰阶值；
    所述当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
  13. 一种图像显示装置，其中，所述装置包括：
    白色第一灰阶值获取单元，用于接收当前图像中各像素点的三色子像素数据，所述三色子像素数据包括红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1；根据所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1获取白色灰阶系数；根据所述白色灰阶系数和所述红色第一灰阶值R1、所述绿色第一灰阶值G1、所述蓝色第一灰阶值B1中的最小值获取白色第一灰阶值W1；
    色域匹配单元，与所述白色第一灰阶值获取单元连接，用于按照预定规则对所述红色第一灰阶值R1、所述绿色第一灰阶值G1、所述蓝色第一灰阶值B1和所述白色第一灰阶值W1进行色域匹配以获取红色第二灰阶值R2、绿色第二灰阶值G2、蓝色第二灰阶值B2和白色第二灰阶值W2；
    子像素渲染单元，与所述色域匹配单元连接，用于对所述色域匹配单元获取的所述红色第二灰阶值R2、所述绿色第二灰阶值G2、所述蓝色第二灰阶值B2、所述白色第二灰阶值W2进行子像素渲染以获取各像素点对应的更新后的所述三色子像素数据并输出至显示面板，更新后的所述三色子像素数据包括红色第三灰阶值R3、绿色第三灰阶值G3、蓝色第三灰阶值B3和白色第三灰阶值W3中的任意三者。
  14. 根据权利要求13所述的装置，其中，所述白色第一灰阶值获取单元根据所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1获取白色灰阶系数的操作包括：获取所述红色第一灰阶值R1、所述绿色第一灰阶值G1和所述蓝色第一灰阶值B1中的最大值和最小值；获取所述最大值和所述最小值的差值；计算所述当前图像中各像素点对应的所述差值的均值；根据所述均值通过查表法获取白色灰阶系数。
  15. 根据权利要求14所述的装置，其中，所述白色第一灰阶值W1根据如下公式进行计算：
    W1=Min（R1、G1、B1）-Min（R1、G1、B1）*RA_W；
    其中，W1为白色第一灰阶值，Min（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最小值，RA_W为白色灰阶系数。
  16. 根据权利要求15所述的装置，其中，所述白色灰阶系数随着所述均值的增大而变大。
  17. 根据权利要求13所述的装置，其中，所述色域匹配单元根据公式：
    X2=X1*（Max（R1、G1、B1）+W1）/ Max（R1、G1、B1）-W1获取所述红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2；
    其中，X1分别为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1，对应地，X2分别为红色第二灰阶值R2、绿色第二灰阶值G2和蓝色第二灰阶值B2； Max（R1、G1、B1）为红色第一灰阶值R1、绿色第一灰阶值G1和蓝色第一灰阶值B1中的最大值； W1为白色第一灰阶值；
    其中，白色第二灰阶值W2等于白色第一灰阶值W1。
  18. 根据权利要求13所述的装置，其中，对应于更新后的所述三色子像素数据的所述像素点按照R3G3B3、W3R3G3、B3W3R3、G3B3W3的顺序进行排列，其中R3表示红色第三灰阶值、G3表示绿色第三灰阶值、B3表示蓝色第三灰阶值、W3表示白色第三灰阶值。
  19. 根据权利要求18所述的装置，其中，所述子像素渲染单元获取对应于更新后的所述三色子像素数据的所述像素点的操作包括：获取前一像素点更新后的所述三色子像素数据中缺失的颜色对应的第二灰阶值，记为第一值；获取当前像素点中对应该颜色的第二灰阶值，记为第二值；根据所述第一值和所述第二值获取所述当前像素点中该颜色的第三灰阶值；所述当前像素点中剩余颜色的第三灰阶值等于对应颜色的第二灰阶值。
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