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WO2015152004A1 - Dispositif d'affichage à multiples couleurs primaires - Google Patents

Dispositif d'affichage à multiples couleurs primaires Download PDF

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Publication number
WO2015152004A1
WO2015152004A1 PCT/JP2015/059427 JP2015059427W WO2015152004A1 WO 2015152004 A1 WO2015152004 A1 WO 2015152004A1 JP 2015059427 W JP2015059427 W JP 2015059427W WO 2015152004 A1 WO2015152004 A1 WO 2015152004A1
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WIPO (PCT)
Prior art keywords
pixel
sub
primary color
luminance
signal
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Ceased
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PCT/JP2015/059427
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English (en)
Japanese (ja)
Inventor
冨沢　一成
慎司 中川
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Sharp Corp
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Sharp Corp
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/67—Circuits for processing colour signals for matrixing
    • 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
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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

Definitions

  • the present invention relates to a multi-primary color display device.
  • one pixel is constituted by three sub-pixels that display red, green, and blue, which are the three primary colors of light, thereby enabling color display.
  • the conventional display device has a problem that a displayable color range (referred to as a “color reproduction range”) is narrow.
  • a displayable color range referred to as a “color reproduction range”
  • it is impossible to display a part of the object color the colors of various objects existing in nature; see Non-Patent Document 1). Therefore, in order to widen the color reproduction range of the display device, a method of increasing the number of primary colors used for display has been proposed.
  • Patent Document 1 discloses a display device that performs display using six primary colors.
  • Patent Document 1 also discloses a display device that performs display using four primary colors and a display device that performs display using five primary colors.
  • An example of a display device that performs display using the six primary colors is shown in FIG.
  • one pixel P is constituted by the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, the cyan sub-pixel C, the magenta sub-pixel M, and the yellow sub-pixel Ye.
  • color display is performed by mixing the six primary colors red, green, blue, cyan, magenta, and yellow displayed by the six sub-pixels.
  • a display device that performs display using four or more primary colors is referred to as a “multi-primary color display device”, and a display device that performs display using three primary colors (that is, a conventional general) is referred to as “three primary colors”. It is referred to as a “display device”.
  • Patent Document 2 proposes a technique for displaying an image with the same or higher resolution in a multi-primary color display device without reducing the subpixel size as compared with the three primary color display device.
  • a plurality of sub-pixels SP1 to SP6 constituting one pixel P are a plurality of virtual pixels (hereinafter referred to as “virtual pixels”). It is possible to distribute the display to VP1 and VP2 and display each virtual pixel as a display unit.
  • FIG. 18 shows a signal conversion circuit 920 included in the multi-primary color display device 900 of Patent Document 2.
  • the signal conversion circuit 920 includes a low-frequency multi-primary color signal generation unit 921, a high-frequency luminance signal generation unit 922, and a rendering processing unit 923.
  • the signal conversion circuit 920 further includes a ⁇ correction unit 924 and an inverse ⁇ correction unit 925.
  • the input image signal to the signal conversion circuit 920 is first subjected to ⁇ correction processing by the ⁇ correction unit 924.
  • the image signal subjected to the ⁇ correction processing is input to the low-frequency multi-primary color signal generation unit 921 and the high-frequency luminance signal generation unit 922, respectively.
  • the low-frequency multi-primary color signal generation unit 921 generates a low-frequency multi-primary color signal based on the input image signal.
  • the low-frequency multi-primary color signal is a signal in which low-frequency components (components having a relatively low spatial frequency) of the input image signal are converted into multi-primary colors (that is, converted so as to correspond to four or more primary colors). .
  • the low-frequency multi-primary color signal generation unit 921 includes a low-frequency component extraction unit (low-pass filter: LPF) 926 and a multi-primary color conversion unit 927.
  • the low pass filter 926 extracts a low frequency component from the input image signal.
  • the low-frequency component of the input image signal extracted by the low-pass filter 926 is converted into multi-primary colors by the multi-primary color conversion unit 927.
  • the multi-primary low-frequency component is output as a low-frequency multi-primary color signal.
  • the high frequency luminance signal generation unit 922 generates a high frequency luminance signal based on the input image signal.
  • the high frequency luminance signal is a signal obtained by luminance conversion of a high frequency component (component having a relatively high spatial frequency) of the input image signal.
  • the high frequency luminance signal generation unit 922 includes a luminance conversion unit 928 and a high frequency component extraction unit (high bus filter: HPF) 929.
  • the luminance conversion unit 928 performs luminance conversion on the input image signal to generate a luminance signal.
  • the high pass filter 929 extracts the high frequency component of the luminance signal generated by the luminance conversion unit 928 as a high frequency luminance signal.
  • the rendering processing unit 923 converts the low-frequency multi-primary color signal generated by the low-frequency multi-primary color signal generation unit 921 and the high-frequency luminance signal generated by the high-frequency luminance signal generation unit 922 to a plurality of virtual pixels. Perform the rendering process.
  • the rendering processing unit 923 includes a storage unit 923a that stores a weighting factor that defines a distribution pattern of a plurality of subpixels to a plurality of virtual pixels, and selects a preferable weighting factor according to the resolution of the input image and the like.
  • the rendering process is performed in accordance with the distribution pattern defined by the selected weight coefficient.
  • the image signal generated by the rendering process is subjected to inverse ⁇ correction by the inverse ⁇ correction unit 925 and output as a multi-primary color image signal.
  • the signal conversion circuit 920 performs multi-primary color processing on the low frequency components of the input image signal and performs luminance conversion processing on the high frequency components.
  • An image signal (multi-primary color image signal) corresponding to the four primary colors can be output by combining the low-frequency multi-primary color signal and the high-frequency luminance signal obtained by these processes and rendering to a virtual pixel.
  • the magnitude relationship between the luminances of the two pixels may be reversed between the input side and the output side.
  • the luminance of the virtual pixels for performing display corresponding to the pixels in the odd-numbered columns even though the pixels in the odd-numbered columns indicate black and the pixels in the even-numbered columns indicate halftone chromatic colors.
  • the luminance of the virtual pixel for performing display corresponding to the pixels in the even-numbered columns may be higher.
  • this phenomenon may be referred to as “luminance reversal phenomenon”.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-primary color display device capable of improving the resolution by display using virtual pixels, on the input side and the output side as described above. This is to prevent the occurrence of the luminance reversal phenomenon.
  • a multi-primary color display device has a pixel composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and uses four primary colors of red, green, blue, and yellow.
  • a multi-primary color display device performing color display, wherein each pixel has the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel, and an input image signal corresponding to three primary colors
  • a signal conversion circuit that converts the image signal into a multi-primary color image signal corresponding to the four primary colors, and the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel constituting the pixel are converted into two
  • the two virtual pixels can be displayed by allocating to the virtual pixels and adjacent two pixels in the input image can be displayed, and the signal conversion circuit can generate a low frequency component of the input image signal based on the input image signal.
  • a low-frequency multi-primary color signal generation unit that generates a low-frequency multi-primary color signal that is a multi-primary signal, and a signal obtained by luminance-converting a high-frequency component of the input image signal based on the input image signal
  • a high-frequency luminance signal generating unit that generates a high-frequency luminance signal
  • a rendering processing unit that performs rendering processing on the two virtual pixels based on the low-frequency multi-primary color signal and the high-frequency luminance signal.
  • the low-frequency multi-primary color signal generator generates absolute luminance of the red sub-pixel and absolute luminance of the green sub-pixel when one of the two adjacent pixels in the input image indicates a specific color.
  • the low-frequency component can be multi-primary so that the ratio of the absolute luminance of the yellow sub-pixel to the sum is 0.5 or more and 2.0 or less.
  • the specific color is a chromatic color
  • the standardized luminance of blue is a color larger than 1/3 of the larger of the normalized luminance of red and the normalized luminance of green. is there.
  • the low-frequency multi-primary color signal generator generates a sum of absolute luminance of the red sub-pixel and absolute luminance of the green sub-pixel when the one pixel in the input image indicates the specific color.
  • Multiple primary colors can be formed so that the absolute luminance ratio of the yellow sub-pixel is substantially 1.
  • the low-frequency multi-primary color signal generation unit is configured to view a color represented by the low-frequency multi-primary color signal from the front direction.
  • Multiple primary colors can be made so that 1/2 is 0.03 or less.
  • the specific color is a dark skin
  • the low-frequency multi-primary color signal generator generates a color represented by the low-frequency multi-primary color signal when the one pixel in the input image indicates a dark skin.
  • the specified primary color difference ⁇ u′v ′ ((u′ ⁇ u 60 ′) 2 + (v′ ⁇ v 60 ′) 2 ) can be converted to multiple primary colors so that 1/2 is 0.03 or less.
  • the specific color is a light skin
  • the low-frequency multi-primary color signal generator generates a color represented by the low-frequency multi-primary color signal when the one pixel in the input image indicates a light skin.
  • the other pixel when the one of the two adjacent pixels in the input image shows a specific color, the other pixel shows black.
  • each of the two virtual pixels is composed of two or more subpixels of the red subpixel, the green subpixel, the blue subpixel, and the yellow subpixel.
  • a plurality of the pixels are arranged in a matrix including a plurality of rows and a plurality of columns, and the red sub-pixel, the green sub-pixel, and the blue sub-pixel are respectively included in the plurality of pixels.
  • the yellow sub-pixels are arranged in one row and four columns.
  • the multi-primary color display device according to the present invention is a liquid crystal display device.
  • the multi-primary color display device includes a pixel composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and has four primary colors of red, green, blue, and yellow.
  • a multi-primary color display device that performs color display using a multi-primary color display panel having the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel in each pixel, and an input corresponding to three primary colors
  • a signal conversion circuit that converts an image signal into a multi-primary color image signal corresponding to the four primary colors, and the red subpixel, the green subpixel, the blue subpixel, and the yellow subpixel that constitute the pixel
  • the two virtual pixels can be divided and displayed for two adjacent pixels in the input image by the two virtual pixels, and the signal conversion circuit can input the input image signal based on the input image signal.
  • a low-frequency multi-primary color signal generation unit that generates a low-frequency multi-primary color signal that is a signal in which the low-frequency components are converted into multi-primary colors, and the high-frequency component of the input image signal is subjected to luminance conversion based on the input image signal
  • a high-frequency luminance signal generating unit that generates a high-frequency luminance signal that is a received signal; a rendering processing unit that performs rendering processing on the two virtual pixels based on the low-frequency multi-primary color signal and the high-frequency luminance signal;
  • the low-frequency multi-primary color signal generation unit includes a magnitude relationship between luminances of one pixel and the other pixel of the two adjacent pixels in the input image, and a virtual pixel corresponding to the one pixel.
  • the low-frequency component can be converted into multiple primary colors so that the magnitude relationship of the luminance of the virtual pixel corresponding to the other pixel is not reversed.
  • a television receiver includes a multi-primary color display device having the above-described configuration.
  • a driving method of a multi-primary color display device includes a pixel composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and four primary colors of red, green, blue, and yellow
  • a method for driving a multi-primary color display device that performs color display using the method (A) for converting an input image signal corresponding to three primary colors into a multi-primary color image signal corresponding to the four primary colors;
  • the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel to be configured are allocated to two virtual pixels, and two adjacent pixels in the input image are displayed by the two virtual pixels (B
  • the step (A) generates, based on the input image signal, a low-frequency multi-primary color signal that is a signal in which low-frequency components of the input image signal are converted into multi-primary colors (a )When, A step (b) of generating a high-frequency luminance signal, which is a signal
  • a driving method of a multi-primary color display device includes a pixel composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and four primary colors of red, green, blue, and yellow
  • a multi-primary color display apparatus that performs color display using the step (A) of converting an input image signal corresponding to three primary colors into a multi-primary color image signal corresponding to the four primary colors, and the pixel constituting the pixel Distributing the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel to two virtual pixels, and performing display of two adjacent pixels in the input image by the two virtual pixels;
  • the step (A) includes a step (a) of generating a low-frequency multi-primary color signal, which is a signal in which low-frequency components of the input image signal are multi-primary based on the input image signal;
  • the input picture Based on the signal, the step (b) of generating a high-frequency luminance
  • the multi-primary color display device that can improve the resolution by display using virtual pixels, it is to prevent the occurrence of a luminance reversal phenomenon between the input side and the output side.
  • FIG. 1 is a block diagram schematically showing a liquid crystal display device (multi-primary color display device) 100 according to an embodiment of the present invention.
  • 3 is a diagram illustrating an example of sub-pixel arrangement of a multi-primary color display panel 10 included in the liquid crystal display device 100.
  • FIG. 3 is a diagram illustrating an example of sub-pixel arrangement of a multi-primary color display panel 10 included in the liquid crystal display device 100.
  • FIG. It is a figure which shows the example of the distribution pattern of the sub pixel to two virtual pixels. It is a figure which shows the example of the distribution pattern of the sub pixel to two virtual pixels.
  • 3 is a block diagram schematically showing a signal conversion circuit 20 provided in the liquid crystal display device 100.
  • (A) to (l) are diagrams illustrating an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate gray (halftone achromatic color) in the input image.
  • (A) to (l) are multi-primary color conversions in the case where both odd-numbered pixels and even-numbered pixels indicate dark skin in the input image (that is, when the input image is a solid image of dark skin). It is a figure which shows an example.
  • (A)-(l) is a figure which shows the example of multi-primary color conversion in case the pixel of an odd number column shows black and the pixel of an even number column has shown the dark skin in the input image.
  • the color reproduction range of the multi-primary color display panel 10 and the BT. 7 is a chromaticity diagram illustrating a color gamut of 709;
  • FIG. (A) to (l) are diagrams illustrating an example of multi-primary color conversion in the case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate dark skin in the input image. The case where the combination of the sub-pixel brightness of the first embodiment is selected is shown.
  • (A) to (l) are diagrams illustrating an example of multi-primary color conversion in the case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate dark skin in the input image. The case where the combination of the sub-pixel luminance of Example 2 is selected is shown.
  • (A) to (l) are diagrams showing an example of multi-primary color conversion in the case where odd-numbered columns of pixels indicate dark skin and even-numbered columns of pixels indicate black in the input image.
  • the case where the combination of the sub-pixel luminance of Example 3 is selected is shown.
  • (A) to (l) are diagrams illustrating an example of multi-primary color conversion in the case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate dark skin in the input image.
  • FIG. 9 shows a case where a combination of sub-pixel luminances in the comparative example is selected.
  • (A) to (l) are diagrams illustrating an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate chromatic colors and even-numbered columns of pixels indicate black in the input image.
  • FIG. 10 is a block diagram schematically showing a signal conversion circuit 920 included in the multi-primary color display device 900 of Patent Document 2.
  • FIG. 10 is a block diagram schematically showing a signal conversion circuit 920 included in the multi-primary color display device 900 of Patent Document 2.
  • liquid crystal display device is illustrated below, this invention is not limited to a liquid crystal display device.
  • FIG. 1 shows a liquid crystal display device 100 according to this embodiment.
  • the liquid crystal display device 100 includes a multi-primary color display panel 10 and a signal conversion circuit 20, and performs display using four primary colors of red, green, blue, and yellow ( 4 primary color display device).
  • the multi-primary color display panel 10 has pixels composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel.
  • a plurality of pixels are arranged in a matrix including a plurality of rows and a plurality of columns.
  • FIG. 2 shows an example of a specific pixel structure (sub-pixel arrangement) of the multi-primary color display panel 10.
  • each pixel P of the multi-primary color display panel 10 is composed of four sub-pixels. More specifically, a red sub-pixel R that displays red and a green sub-pixel that displays green G, a blue sub-pixel B that displays blue, and a yellow sub-pixel Ye that displays yellow. Within each pixel P, the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye are arranged in one row and four columns.
  • the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye are arranged in this order from the left side to the right side.
  • the sub-pixel arrangement is not limited to this.
  • the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye may be arranged in this order from the right side to the left side. Good.
  • the signal conversion circuit 20 converts an input image signal (three primary color image signals) corresponding to three primary colors (RGB) into an image signal corresponding to four primary colors (referred to as “multi-primary color image signal”). Convert to The multi-primary color image signal output from the signal conversion circuit 20 is input to the multi-primary color display panel 10, and color display using the four primary colors is performed. A specific configuration of the signal conversion circuit 20 will be described in detail later.
  • the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye constituting each pixel P are divided into two virtual pixels (“first virtual pixel” and “first virtual pixel”). 2 virtual pixels ”) and display of two adjacent pixels in the input image can be performed by these two virtual pixels.
  • Each of the two virtual pixels includes two or more sub-pixels among the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye.
  • FIG. 4 shows an example of a distribution pattern of sub-pixels to two virtual pixels.
  • the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye are distributed to two virtual pixels (first virtual pixel and second virtual pixel) VP1 and VP2.
  • the first virtual pixel VP1 includes a red subpixel R, a green subpixel G, and a blue subpixel B.
  • the second virtual pixel VP2 includes a blue subpixel B and a yellow subpixel Ye.
  • the first virtual pixel VP1 and the second virtual pixel VP2 include a blue subpixel B as a common subpixel, and share the blue subpixel B.
  • each of the first virtual pixel VP1 and the second virtual pixel VP2 is configured by two or more subpixels continuous in one pixel P. It is not limited to this.
  • FIG. 5 shows another example of the distribution pattern.
  • the first virtual pixel VP1 shown in FIG. 5 includes a red subpixel R, a green subpixel G, and a blue subpixel B of the left pixel P.
  • the second virtual pixel VP2 includes a blue subpixel B and a yellow subpixel Ye of the left pixel P, and a red subpixel R of the right pixel P.
  • the second virtual pixel VP2 is configured by a plurality of (here, three) sub-pixels that extend across the two pixels P.
  • the virtual pixel may straddle the two pixels P.
  • the liquid crystal display device 100 includes a plurality of sub-pixels (the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye) that constitute each pixel P as two virtual pixels (first sub-pixels). 1 virtual pixel VP1 and second virtual pixel VP2), and information can be displayed independently by each virtual pixel. Therefore, the display for two adjacent pixels in the input image can be performed by these two virtual pixels.
  • FIG. 6 shows an example of a specific configuration of the signal conversion circuit 20.
  • the signal conversion circuit 20 includes a low-frequency multi-primary color signal generation unit 21, a high-frequency luminance signal generation unit 22, and a rendering processing unit 23.
  • the signal conversion circuit 20 further includes a ⁇ correction unit 24 and an inverse ⁇ correction unit 25.
  • the input image signal to the signal conversion circuit 20 is first subjected to ⁇ correction processing by the ⁇ correction unit 24.
  • the image signal that has been subjected to the ⁇ correction processing is input to the low-frequency multi-primary color signal generation unit 21 and the high-frequency luminance signal generation unit 22, respectively.
  • the low-frequency multi-primary color signal generation unit 21 generates a low-frequency multi-primary color signal based on the input image signal.
  • the low-frequency multi-primary color signal is a signal obtained by converting low-frequency components (components having a relatively low spatial frequency) of the input image signal into multi-primary colors (that is, converted so as to correspond to the four primary colors).
  • the low-frequency multi-primary color signal generation unit 21 includes a low-frequency component extraction unit (here, a low-pass filter: LPF) 26 and a multi-primary color conversion unit 27.
  • the low pass filter 26 extracts a low frequency component from the input image signal.
  • the low-frequency component of the input image signal extracted by the low-pass filter 26 is converted into multi-primary colors by the multi-primary color conversion unit 27.
  • the multi-primary low-frequency component is output as a low-frequency multi-primary color signal.
  • the high frequency luminance signal generation unit 22 generates a high frequency luminance signal based on the input image signal.
  • the high frequency luminance signal is a signal obtained by luminance conversion of a high frequency component (component having a relatively high spatial frequency) of the input image signal.
  • the high frequency luminance signal generation unit 22 includes a luminance conversion unit 28 and a high frequency component extraction unit (here, a high-pass filter: HPF) 29.
  • the luminance conversion unit 28 performs luminance conversion on the input image signal to generate a luminance signal.
  • the high pass filter 29 extracts the high frequency component of the luminance signal generated by the luminance conversion unit 28 as a high frequency luminance signal.
  • the rendering processing unit 23 outputs two virtual pixels based on the low-frequency multi-primary color signal generated by the low-frequency multi-primary color signal generation unit 21 and the high-frequency luminance signal generated by the high-frequency luminance signal generation unit 22. Perform the rendering process.
  • the image signal generated by the rendering process is subjected to inverse ⁇ correction by the inverse ⁇ correction unit 25 and is output as a multi-primary color image signal.
  • the signal conversion circuit 20 considers human visual characteristics that the sensitivity to the luminance signal is superior to the color signal (that is, the visibility of the color difference is lower than the luminance visibility), Multi-primary color processing is performed on the low-frequency component of the input image signal, and luminance conversion processing is performed on the high-frequency component.
  • An image signal (multi-primary color image signal) corresponding to the four primary colors can be output by combining the low-frequency multi-primary color signal and the high-frequency luminance signal obtained by these processes and rendering to a virtual pixel.
  • the low-frequency multi-primary color signal generation unit 21 satisfies the predetermined relationship between the luminance values of the red sub-pixel R, the green sub-pixel G, and the yellow sub-pixel Ye for a specific input image signal. As described above, it is possible to perform multi-primary color formation of low-frequency components. Specifically, the low frequency multi-primary color signal generation unit 21 determines the absolute luminance of the red sub-pixel R and the absolute luminance of the green sub-pixel G when one of the two adjacent pixels in the input image indicates a specific color. Multi-primary colors of low-frequency components can be obtained so that the ratio of the absolute luminance of the yellow subpixel to the luminance sum is 0.5 or more and 2.0 or less.
  • FIG. 7 is a diagram showing an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate gray (halftone achromatic color) in the input image.
  • the red, green, and blue luminances are zero for the odd-numbered pixels, and the red for the even-numbered pixels.
  • Green and blue luminances are the same value greater than zero.
  • the input image signal is passed through an LPF (low pass filter), and as shown in FIG. 7B, the luminance of red, green and blue is averaged by two pixels.
  • LPF low pass filter
  • the luminances of red, green, blue, and yellow are the same (but not zero). Multi-primary color signal) is obtained.
  • a white component (corresponding to the luminance signal) corresponding to the minimum values of red, green, and blue luminance is extracted from the input image signal.
  • the extracted white component is passed through an HPF (high-pass filter) and corresponds to an odd number column as shown in FIG. 7 (e) and an even number column as shown in FIG. 7 (f). Separate into minutes.
  • FIGS. 7G and 7H each of the separated white components is converted into the luminance of the color of the sub-pixel constituting the corresponding virtual pixel.
  • the white component corresponding to the odd number column is converted into the luminance of the color (red, green, blue) of the sub-pixel constituting the virtual pixel corresponding to the odd number column, and the white component corresponding to the even number example is converted to the even number column.
  • the luminance is converted to the luminance of the color (blue, yellow, red) of the sub-pixel constituting the corresponding virtual pixel. Since the white component corresponding to the odd-numbered columns is zero, as shown in FIG. 7G, the luminance of each color after conversion is also zero. On the other hand, since the white component corresponding to the even-numbered columns is not zero, the luminance of each color after conversion is not zero as shown in FIG. Thereafter, as shown in FIG.
  • the combined luminance is further combined with the low-frequency multi-primary color signal.
  • the white component extracted from the input image signal is passed through the LPF (see FIG. 7 (j)) is subtracted from the low-frequency multi-primary color signal (see FIG. 7 (k)).
  • the later luminance (here, zero for all colors) is added to the luminance shown in FIG.
  • a multi-primary color image signal as shown in FIG. According to this multi-primary color image signal, only virtual pixels corresponding to even columns are lit. Therefore, the luminance reversal phenomenon does not occur.
  • FIG. 8 is a diagram illustrating an example of multi-primary color conversion in a case where both odd-numbered pixels and even-numbered columns of pixels in the input image indicate dark skin (that is, when the input image is a solid image of dark skin). is there.
  • the red, green, and blue luminances (normalized luminances) for both the odd-numbered pixels and the even-numbered pixels are predetermined values larger than zero. Value.
  • the input image signal is passed through the LPF, and as shown in FIG. 8B, the luminance of red, green and blue is averaged by two pixels.
  • a white component (corresponding to a luminance signal) corresponding to the minimum values of red, green, and blue luminance is extracted from the input image signal.
  • the extracted white component is passed through the HPF and separated into an amount corresponding to an odd number column as shown in FIG. 8 (e) and an amount corresponding to an even number column as shown in FIG. 8 (f). To do.
  • FIGS. 8G and 8H each of the separated white components is converted into the luminance of the color of the sub-pixel constituting the corresponding virtual pixel.
  • the white component corresponding to the odd number column is converted into the luminance of the color (red, green, blue) of the sub-pixel constituting the virtual pixel corresponding to the odd number column, and the white component corresponding to the even number example is converted to the even number column.
  • the luminance is converted to the luminance of the color (blue, yellow, red) of the sub-pixel constituting the corresponding virtual pixel. Since the white component corresponding to the odd-numbered column and the white component corresponding to the even-numbered column are not zero, as shown in FIGS. 8G and 8H, the luminance of each color after conversion is not zero. Thereafter, as shown in FIG.
  • the combined luminance is further combined with the low-frequency multi-primary color signal.
  • the white component extracted from the input image signal is passed through the LPF (see FIG. 8 (j)) is subtracted from the low-frequency multi-primary color signal (see FIG. 8 (k)).
  • the subsequent luminance (here, red, green, and blue are positive and yellow is negative) is added to the luminance shown in FIG.
  • a multi-primary color image signal as shown in FIG. According to this multi-primary color image signal, both virtual pixels corresponding to odd columns and virtual pixels corresponding to even columns are lit.
  • the brightness of two adjacent pixels is the same on the input side, whereas the brightness of the two virtual pixels is greatly different on the output side.
  • the red, green, blue, and yellow luminances (luminances in FIG. 8L) in the output image signal are excellent in viewing angle characteristics. Therefore, in the example shown in FIG. 8, excellent viewing angle characteristics are maintained.
  • FIG. 9 is a diagram illustrating an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate dark skin in the input image.
  • the red, green, and blue luminances are zero for the pixels in the odd columns, and the red for the pixels in the even columns.
  • Green and blue luminances are predetermined values larger than zero.
  • the input image signal is passed through the LPF, and as shown in FIG. 9B, the luminance of red, green and blue is averaged by two pixels.
  • a white component (corresponding to a luminance signal) corresponding to the minimum values of red, green, and blue luminance is extracted from the input image signal.
  • the extracted white component is passed through the HPF and separated into an amount corresponding to an odd number column as shown in FIG. 9 (e) and an amount corresponding to an even number column as shown in FIG. 9 (f). To do.
  • FIGS. 9G and 9H each of the separated white components is converted into the luminance of the color of the sub-pixel constituting the corresponding virtual pixel.
  • the white component corresponding to the odd number column is converted into the luminance of the color (red, green, blue) of the sub-pixel constituting the virtual pixel corresponding to the odd number column, and the white component corresponding to the even number example is converted to the even number column.
  • the luminance is converted to the luminance of the color (blue, yellow, red) of the sub-pixel constituting the corresponding virtual pixel. Since the white component corresponding to the odd-numbered columns is zero, as shown in FIG. 9G, the luminance of each color after conversion is also zero. On the other hand, since the white component corresponding to the even-numbered column is not zero, the luminance of each color after conversion is not zero, as shown in FIG. Thereafter, as shown in FIG. 9I, these are added together.
  • the combined luminance is further combined with the low-frequency multi-primary color signal.
  • the white component extracted from the input image signal is passed through the LPF (see FIG. 9 (j)) is subtracted from the low-frequency multi-primary color signal (see FIG. 9 (k)).
  • the subsequent luminance (here, red, green, and blue are positive and yellow is negative) is added to the luminance shown in FIG.
  • a multi-primary color image signal as shown in FIG.
  • both virtual pixels corresponding to odd columns and virtual pixels corresponding to even columns are lit. Further, the luminance of the virtual pixels corresponding to the odd columns is higher than the luminance of the virtual pixels corresponding to the even columns.
  • the luminances of red, green, blue, and yellow in the output image signal are the viewing angles.
  • the combination may not be excellent in characteristics (because it is different from the luminance in FIG. 9C), and in the example shown in FIG. 9, the viewing angle characteristic may be deteriorated.
  • a high-frequency image such as a single line illustrated in FIG. 9, even if the viewing angle characteristic is bad, it does not cause a display problem (not so much).
  • the low-frequency multi-primary color signal generation unit 21 performs a specific input image signal (one of the two adjacent pixels in the input image indicates a specific color). ), The primary color of the low-frequency component so that the ratio of the absolute luminance of the yellow subpixel Ye to the sum of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G is 0.5 or more and 2.0 or less. By performing the conversion, the occurrence of the luminance reversal phenomenon as described above can be prevented.
  • the low-frequency multi-primary color signal generation unit 21 performs low-frequency so that the magnitude relationship between the luminances of two adjacent pixels in the input image is not opposite to the luminance relationship between the two virtual pixels corresponding to the two pixels. Multi-primary colorization of components can be performed.
  • Table 1 shows red, green, blue, yellow, and pixel P displayed by the red subpixel R, the green subpixel G, the blue subpixel B, and the yellow subpixel Ye of the multi-primary color display panel 10 of the present embodiment.
  • FIG. 10 shows the color reproduction range of the multi-primary color display panel 10 of the present embodiment.
  • BT A color gamut of 709 is also shown.
  • Table 2 below shows BT.
  • the chromaticity x, y and tristimulus values X, Y, Z of primary colors (red, green, blue) and white (D65 standard light source) at 709 are shown.
  • Table 3 shows the gradations and luminances (normalized luminance) of red, green, and blue when the dark skin is represented by the three primary color image signals, and Table 4 below shows the chromaticity x, y and tristimulus of the dark skin. The values X, Y, Z are shown.
  • Table 5 shows red, green, and blue gradations and luminance (normalized luminance) when the light skin is represented by the three primary color image signals.
  • Table 6 shows the light skin chromaticity x, y and Tristimulus values X, Y and Z are shown.
  • the chromaticity and tristimulus values of the dark skin and light skin may not be exactly the same as those exemplified in Table 4 and Table 6.
  • the chromaticity of the dark skin and light skin may be It may be around 0.02 from the values exemplified in Table 6, and the Y value of the dark skin and light skin may be around 0.005 and 0.01 from the values exemplified in Table 4 and Table 6, respectively. Good.
  • Table 7 shows examples (# 1 D to # 10 D ) of combinations of gradation and luminance of the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye for displaying the dark skin. Show.
  • Table 7 shows two types of luminance, that is, normalized luminance and absolute luminance.
  • the normalized luminance is the luminance normalized with the highest gradation luminance of each color as 1, and the absolute luminance is obtained by multiplying the normalized luminance by the Y value of each color.
  • Table 7 also shows the ratio (R + G: Ye) of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G and the absolute luminance of the yellow subpixel Ye for each example.
  • Table 8 shows chromaticity x, y, and Y values when the dark skin is viewed from the front direction, and chromaticity x, y, and Y values when viewed from the oblique 60 ° direction.
  • Table 8 shows chromaticity coordinates (u ′, v ′) indicating chromaticity when the dark skin is viewed from the front direction and chromaticity coordinates (u ′) indicating chromaticity when viewed from the oblique 60 ° direction.
  • the low-frequency multi-primary color signal generation unit 21 performs the absolute luminance and green sub-pixels of the red sub-pixel R when one of the two adjacent pixels in the input image indicates a dark skin.
  • the low primary component multi-primary color is formed so that the ratio of the absolute luminance of the yellow sub-pixel Ye to the sum of the absolute luminances of the pixels G is 0.5 or more and 2.0 or less. That is, of the combinations shown in Table 7, not the first and eighth to tenth combinations (# 1 D , # 8 D to # 10 D ), but the second to seventh combinations (# 2 D Multi-primary colors are selected so that .about. # 7 D ) is selected.
  • Table 9 shows examples (# 1 L to # 11 L ) of combinations of gradations and luminances of the red sub-pixel R, the green sub-pixel G, the blue sub-pixel B, and the yellow sub-pixel Ye for displaying the light skin. Show. Table 9 shows two types of luminance, normalized luminance and absolute luminance. Table 9 also shows the ratio (R + G: Ye) of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G and the absolute luminance of the yellow subpixel Ye for each example. ing.
  • Table 10 shows chromaticity x, y, and Y values when the light skin is viewed from the front direction, and chromaticity x, y, and Y values when viewed from the oblique 60 ° direction.
  • Table 10 shows chromaticity coordinates (u ′, v ′) indicating chromaticity when the light skin is viewed from the front direction and chromaticity coordinates (u ′) indicating chromaticity when viewed from the oblique 60 ° direction.
  • the low-frequency multi-primary color signal generation unit 21 performs the absolute luminance and green sub-range of the red sub-pixel R when one of the two adjacent pixels in the input image indicates a light skin.
  • the low primary component multi-primary color is formed so that the ratio of the absolute luminance of the yellow sub-pixel Ye to the sum of the absolute luminances of the pixels G is 0.5 or more and 2.0 or less. That is, of the combinations shown in Table 9, the third to ninth, not the first, second, tenth and eleventh combinations (# 1 L , # 2 L , # 10 L , # 11 L ). Multi-primary color conversion is performed so as to select the second combination (# 3 L to # 9 L ).
  • FIG. 11 is a diagram illustrating an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate dark skin in the input image.
  • the red, green, and blue luminances are zero for the odd-numbered pixels, and the red for the even-numbered pixels.
  • Green and blue luminances are predetermined values larger than zero.
  • the maximum value of the luminances of red, green, and blue in the even-numbered pixels is 0.123.
  • the input image signal is passed through the LPF, and as shown in FIG. 11B, the luminance of red, green and blue is averaged by two pixels.
  • this signal is converted into multiple primary colors (4-color conversion), as shown in FIG. 11C, the absolute luminance of the yellow sub-pixel Ye with respect to the sum of the absolute luminance of the red sub-pixel R and the absolute luminance of the green sub-pixel G.
  • a multi-primary color signal low-frequency multi-primary color signal
  • a white component (corresponding to a luminance signal) corresponding to the minimum values of red, green, and blue luminance is extracted from the input image signal.
  • the luminance of the white component normalized luminance
  • the extracted white component is passed through the HPF and separated into an amount corresponding to an odd number column as shown in FIG. 11 (e) and an amount corresponding to an even number column as shown in FIG. 11 (f). To do.
  • FIGS. 11G and 11H each of the separated white components is converted into the luminance of the color of the sub-pixel constituting the corresponding virtual pixel.
  • the white component corresponding to the odd number column is converted into the luminance of the color (red, green, blue) of the sub-pixel constituting the virtual pixel corresponding to the odd number column, and the white component corresponding to the even number example is converted to the even number column.
  • the luminance is converted to the luminance of the color (blue, yellow, red) of the sub-pixel constituting the corresponding virtual pixel. Since the white component corresponding to the odd-numbered column is zero, as shown in FIG. 11G, the luminance of each color after conversion is also zero.
  • the white components corresponding to the even columns are not zero, and as shown in FIG. 11 (h), the luminances (absolute luminances) of blue, yellow, and red after conversion are 0.024, 0.042, 0.003. Thereafter, as shown in FIG.
  • the combined luminance is further combined with the low-frequency multi-primary color signal.
  • the white component extracted from the input image signal is passed through the LPF (as shown in FIG. 11 (j), converted into absolute brightness of red, green, blue, and yellow, 0.007 respectively. , 0.014, 0.004, 0.019) are subtracted from the low-frequency multi-primary color signal, and the luminance after the subtraction (as shown in FIG. 11 (k), here, red, green, blue, yellow are 0 respectively) .026, 0.001, 0.001, 0.029) are added to the luminance shown in FIG.
  • this multi-primary color image signal both virtual pixels corresponding to odd columns and virtual pixels corresponding to even columns are lit.
  • the luminance of the virtual pixels corresponding to the even columns is higher than the luminance of the virtual pixels corresponding to the odd columns. Therefore, the luminance reversal phenomenon does not occur.
  • FIG. 12 is a diagram illustrating an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate dark skin in the input image.
  • the red, green, and blue luminances are zero for the odd-numbered pixels, and the red for the even-numbered pixels.
  • Green and blue luminances are predetermined values larger than zero.
  • the maximum value of the luminances of red, green, and blue in the even-numbered pixels is 0.123.
  • the input image signal is passed through the LPF, and as shown in FIG. 12B, the luminance of red, green and blue is averaged by two pixels.
  • this signal is converted into multiple primary colors (4-color conversion), as shown in FIG. 12C, the absolute luminance of the yellow sub-pixel Ye with respect to the sum of the absolute luminance of the red sub-pixel R and the absolute luminance of the green sub-pixel G.
  • a white component (corresponding to a luminance signal) corresponding to the minimum values of red, green, and blue luminance is extracted from the input image signal.
  • the luminance of the white component normalized luminance
  • the extracted white component is passed through the HPF and separated into an amount corresponding to an odd number column as shown in FIG. 12 (e) and an amount corresponding to an even number column as shown in FIG. 12 (f). To do.
  • FIGS. 12G and 12H each of the separated white components is converted into the luminance of the color of the sub-pixel constituting the corresponding virtual pixel.
  • the white component corresponding to the odd number column is converted into the luminance of the color (red, green, blue) of the sub-pixel constituting the virtual pixel corresponding to the odd number column, and the white component corresponding to the even number example is converted to the even number column.
  • the luminance is converted to the luminance of the color (blue, yellow, red) of the sub-pixel constituting the corresponding virtual pixel. Since the white component corresponding to the odd-numbered columns is zero, as shown in FIG. 12G, the luminance of each color after conversion is also zero.
  • the white components corresponding to the even columns are not zero, and the luminances (absolute luminances) of blue, yellow, and red after conversion are 0.024, 0.042, 0.003. Thereafter, as shown in FIG.
  • the combined luminance is further combined with the low-frequency multi-primary color signal.
  • the white component extracted from the input image signal is passed through the LPF (as shown in FIG. 12 (j), converted into absolute luminances of red, green, blue and yellow, 0.007 respectively. , 0.014, 0.004, 0.019) are subtracted from the low-frequency multi-primary color signal, and the luminance after subtraction (as shown in FIG. 12 (k), red, green, blue, and yellow are 0 here). .029, 0.013, 0.001, 0.014) is added to the luminance shown in FIG.
  • FIG. 13 is a diagram illustrating an example of multi-primary color conversion in a case where odd-numbered pixels in the input image indicate dark skin and even-numbered pixels indicate black.
  • the red, green, and blue luminances are predetermined values larger than zero, For these pixels, the luminance of red, green and blue (normalized luminance) is zero.
  • the maximum value of the luminances of red, green, and blue in the odd-numbered pixels is 0.123.
  • the input image signal is passed through the LPF, and as shown in FIG. 13B, the luminance of red, green and blue is averaged by two pixels.
  • this signal is converted into multiple primary colors (4-color conversion), as shown in FIG. 13C, the absolute luminance of the yellow subpixel Ye with respect to the sum of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G is calculated.
  • a multi-primary color signal low-frequency multi-primary color signal
  • a white component (corresponding to a luminance signal) corresponding to the minimum values of red, green, and blue luminance is extracted from the input image signal.
  • the luminance of the white component normalized luminance
  • the extracted white component is passed through the HPF and separated into an amount corresponding to an odd number column as shown in FIG. 13 (e) and an amount corresponding to an even number column as shown in FIG. 13 (f). To do.
  • FIGS. 13G and 13H each of the separated white components is converted into the luminance of the color of the sub-pixel constituting the corresponding virtual pixel.
  • the white component corresponding to the odd number column is converted into the luminance of the color (red, green, blue) of the sub-pixel constituting the virtual pixel corresponding to the odd number column, and the white component corresponding to the even number example is converted to the even number column.
  • the luminance is converted to the luminance of the color (blue, yellow, red) of the sub-pixel constituting the corresponding virtual pixel.
  • the white components corresponding to the odd columns are not zero, and the red, green, and blue luminances (absolute luminances) after conversion are 0.012, 0.032, and 0.003, respectively, as shown in FIG. is there.
  • the white component corresponding to the even-numbered columns is zero, the luminance of each color after conversion is also zero as shown in FIG. Thereafter, as shown in FIG.
  • the combined luminance is further combined with the low-frequency multi-primary color signal.
  • the white component extracted from the input image signal is passed through the LPF (as shown in FIG. 13 (j), converted into absolute luminances of red, green, blue, and yellow, 0.007 respectively. , 0.014, 0.004, 0.019) is subtracted from the low-frequency multi-primary color signal, and the luminance after subtraction (as shown in FIG. 13 (k), red, green, blue, and yellow are 0 here). .022, -0.011, 0.001, 0.045) are added to the luminance shown in FIG.
  • this multi-primary color image signal both virtual pixels corresponding to odd columns and virtual pixels corresponding to even columns are lit.
  • the brightness of the virtual pixels corresponding to the even columns is lower than the brightness of the corresponding virtual pixels. Therefore, the luminance reversal phenomenon does not occur.
  • the low frequency multi-primary color signal generation unit 21 of the signal conversion circuit 20 can select the combination of the luminances of the first, second, or third embodiment, thereby preventing the occurrence of the luminance reversal phenomenon.
  • FIG. 14 is a diagram illustrating an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate black and even-numbered columns of pixels indicate dark skin in the input image.
  • the red, green, and blue luminances are zero for the odd-numbered pixels, and the red for the even-numbered pixels.
  • Green and blue luminances are predetermined values larger than zero.
  • the maximum value of the luminances of red, green, and blue in the even-numbered pixels is 0.123.
  • the input image signal is passed through the LPF, and as shown in FIG. 14B, the luminance of red, green and blue is averaged by two pixels.
  • this signal is converted into multiple primary colors (4-color conversion)
  • the absolute luminance of the yellow subpixel Ye with respect to the sum of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G is calculated.
  • a multi-primary color signal low-frequency multi-primary color signal.
  • a white component (corresponding to a luminance signal) corresponding to the minimum values of red, green, and blue is extracted from the input image signal.
  • the luminance of the white component (normalized luminance) is 0.044 (about 1/3 of the maximum luminance).
  • the extracted white component is passed through the HPF and separated into an amount corresponding to an odd number column as shown in FIG. 14 (e) and an amount corresponding to an even number column as shown in FIG. 14 (f). To do.
  • FIGS. 14G and 14H each of the separated white components is converted into the luminance of the color of the sub-pixel constituting the corresponding virtual pixel.
  • the white component corresponding to the odd number column is converted into the luminance of the color (red, green, blue) of the sub-pixel constituting the virtual pixel corresponding to the odd number column, and the white component corresponding to the even number example is converted to the even number column.
  • the luminance is converted to the luminance of the color (blue, yellow, red) of the sub-pixel constituting the corresponding virtual pixel. Since the white component corresponding to the odd-numbered columns is zero, as shown in FIG. 14G, the luminance of each color after conversion is also zero.
  • the white components corresponding to the even columns are not zero, and as shown in FIG. 14 (h), the luminances (absolute luminances) of blue, yellow, and red after conversion are 0.024, 0.042, 0.003. Thereafter, as shown in FIG. 14 (i), these are added together.
  • the combined luminance is further combined with the low-frequency multi-primary color signal.
  • the white component extracted from the input image signal is passed through the LPF (as shown in FIG. 14 (j) 0.00, converted into absolute luminances of red, green, blue, and yellow, 0.007 respectively.
  • 0.014, 0.004, 0.019 is subtracted from the low-frequency multi-primary color signal, and the luminance after subtraction (as shown in FIG. 14 (k), red, green, blue, and yellow are 0 here).
  • .035, 0.040, 0.001, ⁇ 0.018) are added to the luminance shown in FIG.
  • the low-frequency multi-primary color signal generation unit 21 uses the red sub-pixel when one of the two adjacent pixels in the input image shows a specific color.
  • the multi-primary color of the low-frequency component so that the ratio of the absolute luminance of the yellow subpixel Ye to the sum of the absolute luminance of R and the absolute luminance of the green subpixel G is 0.5 or more and 2.0 or less, It is possible to prevent the occurrence of a luminance reversal phenomenon.
  • the ratio of the absolute luminance of the yellow subpixel Ye to the sum of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G is particularly within the above range (0.5 to 2.0). It is not limited. It may be 1 (or substantially 1) as in the first embodiment, may be 0.5 as in the second embodiment, or may be 2 as in the third embodiment. If the ratio of the absolute luminance of the yellow subpixel Ye to the sum of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G is 0.5 or more and 2.0 or less, the white component is 1/3 or more of the total luminance. The luminance reversal phenomenon does not occur for the colors of.
  • FIGS. 15A to 15L are diagrams showing an example of multi-primary color conversion in a case where odd-numbered columns of pixels indicate chromatic colors and even-numbered columns of pixels indicate black in the input image.
  • the relative luminance (normalized luminance) of red and green in the odd-numbered pixels is the same, and the minimum relative luminance is 1/3 with respect to the maximum relative luminance of red, green, and blue.
  • An example is shown.
  • the minimum value of the relative luminance becomes 1/3 or less of the maximum value
  • the color component becomes 2 times or more (2/3 or more for 1/3) with respect to the white component.
  • FIG. 15 shows an example in which the relative luminance of red and green is the same so that the sum of the absolute luminances of red and green becomes the largest after calculation.
  • the relative luminance of red and green in the odd-numbered columns of the input image is set to 1, and when the white component is extracted as shown in FIG. (Luminance) is 0.33.
  • This white component (relative luminance 0.33) is equally distributed to two pixels as shown in FIG. This assumes that when the white component is converted from relative luminance to absolute luminance, red and green and yellow are almost halved (from FIGS. 11 and 12, they are also almost halved).
  • the ratio of the absolute luminance of the yellow sub-pixel Ye to the sum of the absolute luminance of the red sub-pixel R and the absolute luminance of the green sub-pixel G is preferably 2.0 or less.
  • the ratio of the absolute luminance of yellow to the sum of the absolute luminance of red and the absolute luminance of green is less than 0.5, a luminance reversal phenomenon occurs. Therefore, the absolute luminance of the red subpixel R
  • the ratio of the absolute luminance of the yellow sub-pixel Ye to the sum of absolute luminances of the green sub-pixel G is preferably 0.5 or more.
  • the specific color indicated by one of the two adjacent pixels in the input image is the dark skin or the light skin is illustrated, but of course, the embodiment of the present invention is not limited thereto. Is not to be done.
  • the specific color is typically a chromatic color, and a color whose blue standardized luminance is larger than 1/3 of the larger one of the standardized luminance of red and the standardized luminance of green ( That is, B> MAX (R, G) / 3 color).
  • the dark skin is a color in which the normalized luminance of blue is larger than 1/3 of the larger of the normalized luminance of red and the normalized luminance of green (0.092> 0). .267 / 3).
  • the light skin also has a color whose blue standardized luminance is larger than 1/3 of the larger one of the standardized luminance of red and the standardized luminance of green (0.311). > 0.632 / 3).
  • the color indicated by the other of the two adjacent pixels in the input image is black is exemplified, but the embodiment of the present invention is not limited to this.
  • the color indicated by the other pixel may be the specific color. That is, the input image may be a solid image of the specific color.
  • the low-frequency multi-primary color signal generation unit 21 determines the color represented by the low-frequency multi-primary color signal from the front direction when one pixel in the input image indicates a specific color.
  • the second to sixth combinations (# 2 D to # 6 D ) in Table 8 and the third to ninth combinations (# 3 L to # 9 L ) in Table 9 and Table 10 satisfy this condition. is doing.
  • the low-frequency multi-primary color signal generation unit 21 determines the chromaticity when the color represented by the low-frequency multi-primary color signal is viewed from the front direction.
  • the color difference ⁇ u′v ′ defined by the chromaticity coordinates (u ′, v ′) shown and the chromaticity coordinates (u 60 ′, v 60 ′) showing the chromaticity when viewed from an oblique 60 ° direction is 0. It is preferable to perform multi-primary color so as to be 03 or less.
  • the second to sixth combinations (# 2 D to # 6 D ) in Tables 7 and 8 satisfy this condition.
  • the low frequency multi-primary color signal generation unit 21 calculates chromaticity when the color represented by the low frequency multi-primary color signal is viewed from the front direction.
  • the color difference ⁇ u′v ′ defined by the chromaticity coordinates (u ′, v ′) shown and the chromaticity coordinates (u 60 ′, v 60 ′) showing the chromaticity when viewed from an oblique 60 ° direction is 0. It is preferable to perform multi-primary color so as to be 01 or less.
  • the third to ninth combinations (# 3 L to # 9 L ) in Tables 9 and 10 satisfy this condition.
  • the absolute luminance of each sub-pixel can be measured by, for example, an imaging color luminance meter ProMetric® I manufactured by Radiant® Zemax.
  • the multi-primary color display device can perform high-quality display, it is used in various electronic devices, and is preferably used in, for example, a television receiver.
  • the television receiver includes a circuit for receiving television broadcasting in addition to the multi-primary color display device.
  • the driving method of the multi-primary color display device uses a multi-primary image corresponding to the four primary colors (red, green, blue and yellow) from the input image signal corresponding to the three primary colors.
  • (B) which is performed by two virtual pixels VP1 and VP2.
  • Step (A) (signal conversion step) includes a step (a) (low frequency multi-primary color signal generation step) for generating a low frequency multi-primary color signal based on the input image signal, and a high frequency luminance signal based on the input image signal.
  • step (B) (a high-frequency luminance signal generation step), and a step (c) (rendering processing) for rendering the two virtual pixels VP1 and VP2 based on the low-frequency multi-primary color signal and the high-frequency luminance signal Step).
  • step (a) when one of the two adjacent pixels in the input image shows a specific color, the yellow subpixel Ye with respect to the sum of the absolute luminance of the red subpixel R and the absolute luminance of the green subpixel G Multiple primary colors of low-frequency components are performed so that the absolute luminance ratio is 0.5 or more and 2.0 or less.
  • the low primary component multi-primary colors so that the magnitude relationship between the luminances of two adjacent pixels in the input image is not opposite to the luminance relationship between the two virtual pixels corresponding to the two pixels. It can be said that it is made.
  • This specification discloses a multi-primary color display device described in the following items.
  • a multi-primary color display device having a pixel composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and performing color display using four primary colors of red, green, blue, and yellow
  • a multi-primary color display panel having the red sub-pixel, the green sub-pixel, the blue sub-pixel and the yellow sub-pixel in each pixel;
  • a signal conversion circuit that converts an input image signal corresponding to three primary colors into a multi-primary color image signal corresponding to the four primary colors;
  • the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel constituting the pixel are divided into two virtual pixels, and display of two adjacent pixels in the input image is performed by the two virtual pixels.
  • the signal conversion circuit includes: A low-frequency multi-primary color signal generation unit that generates a low-frequency multi-primary color signal based on the input image signal, wherein the low-frequency component of the input image signal is a multi-primary signal; Based on the input image signal, a high-frequency luminance signal generating unit that generates a high-frequency luminance signal that is a signal obtained by luminance conversion of the high-frequency component of the input image signal; A rendering processing unit that performs rendering processing on the two virtual pixels based on the low-frequency multi-primary color signal and the high-frequency luminance signal; The low-frequency multi-primary color signal generator generates a sum of absolute luminance of the red sub-pixel and absolute luminance of the green sub-pixel when one of the two adjacent pixels in the input image indicates a specific color.
  • a multi-primary color display device capable of performing multi-primary coloration of the low-frequency component so that a ratio of absolute luminance of the yellow sub-pixel to 0.5 to 2.0 is achieved.
  • the specific color is a chromatic color, and the standardized luminance of blue is a color larger than 1/3 of the larger one of the normalized luminance of red and the normalized luminance of green.
  • Multi-primary color display device Multi-primary color display device.
  • the low-frequency multi-primary color signal generator When the one pixel in the input image indicates the specific color, the low-frequency multi-primary color signal generator generates the yellow sub-pixel with respect to the sum of the absolute luminance of the red sub-pixel and the absolute luminance of the green sub-pixel. 3.
  • the multi-primary color display device according to item 1 or 2, wherein the multi-primary color can be changed so that the absolute luminance ratio is substantially 1.
  • the low-frequency multi-primary color signal generation unit is a color indicating chromaticity when the color represented by the low-frequency multi-primary color signal is viewed from the front direction.
  • the color difference ⁇ u′v ′ ((u ′, v ′) and the chromaticity coordinates (u 60 ′, v 60 ′) indicating the chromaticity when viewed obliquely from 60 °. -u 60 ′) 2 + (v′ ⁇ v 60 ′) 2 )
  • the multi-primary color display device according to any one of items 1 to 3, capable of performing multi-primary color so that 1/2 is 0.03 or less .
  • the specific color is a dark skin;
  • the multi-primary color display device according to any one of items 1 to 4, which can perform multi-primary color so that 1/2 is 0.03 or less.
  • the specific color is light skin
  • the low-frequency multi-primary color signal generation unit when the one pixel in the input image indicates a light skin, chromaticity coordinates indicating chromaticity when the color represented by the low-frequency multi-primary color signal is viewed from the front direction
  • Color difference ⁇ u′v ′ ((u′ ⁇ u) defined by (u ′, v ′) and chromaticity coordinates (u 60 ′, v 60 ′) indicating chromaticity when viewed from an oblique 60 ° direction 60 ′) 2 + (v′ ⁇ v 60 ′) 2 )
  • the multi-primary color display device according to any one of items 1 to 5, which can be multi-primary so that 1/2 is 0.01 or less.
  • Each of the two virtual pixels is any one of items 1 to 7 including two or more subpixels of the red subpixel, the green subpixel, the blue subpixel, and the yellow subpixel. Multi-primary color display device.
  • a plurality of the pixels are arranged in a matrix including a plurality of rows and a plurality of columns, The multi-primary color according to any one of items 1 to 8, wherein, in each of the plurality of pixels, the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel are arranged in one row and four columns. Display device.
  • the multi-primary color display device according to any one of items 1 to 9, which is a liquid crystal display device.
  • a multi-primary color display device having a pixel composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and performing color display using four primary colors of red, green, blue, and yellow
  • a multi-primary color display panel having the red sub-pixel, the green sub-pixel, the blue sub-pixel and the yellow sub-pixel in each pixel;
  • a signal conversion circuit that converts an input image signal corresponding to three primary colors into a multi-primary color image signal corresponding to the four primary colors;
  • the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel constituting the pixel are divided into two virtual pixels, and display of two adjacent pixels in the input image is performed by the two virtual pixels.
  • the signal conversion circuit includes: A low-frequency multi-primary color signal generation unit that generates a low-frequency multi-primary color signal based on the input image signal, wherein the low-frequency component of the input image signal is a multi-primary signal; Based on the input image signal, a high-frequency luminance signal generating unit that generates a high-frequency luminance signal that is a signal obtained by luminance conversion of the high-frequency component of the input image signal; A rendering processing unit that performs rendering processing on the two virtual pixels based on the low-frequency multi-primary color signal and the high-frequency luminance signal;
  • the low-frequency multi-primary color signal generation unit includes a magnitude relationship between luminances of one pixel and the other pixel of the two adjacent pixels in the input image, a virtual pixel corresponding to the one pixel, and the other pixel.
  • a multi-primary color display device capable of performing multi-primary coloration of the low-frequency component so that the magnitude relationship of the luminance of the virtual pixels corresponding to is not reversed
  • a television receiver comprising the multi-primary color display device according to any one of items 1 to 11.
  • a driving method of a multi-primary color display device having pixels composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and performing color display using four primary colors of red, green, blue, and yellow
  • the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel constituting the pixel are divided into two virtual pixels, and display of two adjacent pixels in the input image is performed by the two virtual pixels.
  • Step (B) The step (A) Generating a low-frequency multi-primary color signal, which is a signal obtained by converting the low-frequency components of the input image signal into multi-primary colors based on the input image signal; Generating a high-frequency luminance signal, which is a signal obtained by luminance-converting a high-frequency component of the input image signal based on the input image signal; (C) performing a rendering process on the two virtual pixels based on the low-frequency multi-primary color signal and the high-frequency luminance signal,
  • the step (a) when one of the two adjacent pixels in the input image shows a specific color, the yellow with respect to the sum of the absolute luminance of the red sub-pixel and the absolute luminance of the green sub-pixel
  • a multi-primary color display device having a pixel composed of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a yellow sub-pixel, and performing color display using four primary colors of red, green, blue, and yellow, A step (A) of converting an input image signal corresponding to three primary colors into a multi-primary color image signal corresponding to the four primary colors;
  • the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the yellow sub-pixel constituting the pixel are divided into two virtual pixels, and display of two adjacent pixels in the input image is performed by the two virtual pixels.
  • Step (B) The step (A) Generating a low-frequency multi-primary color signal, which is a signal obtained by converting the low-frequency components of the input image signal into multi-primary colors based on the input image signal; Generating a high-frequency luminance signal, which is a signal obtained by luminance-converting a high-frequency component of the input image signal based on the input image signal; (C) performing a rendering process on the two virtual pixels based on the low-frequency multi-primary color signal and the high-frequency luminance signal, In the step (a), the magnitude relationship of the luminance of one pixel and the other pixel of the two adjacent pixels in the input image, the virtual pixel corresponding to the one pixel, and the other pixel A driving method of a multi-primary color display device in which the low-frequency component is converted into multiple primary colors so that the magnitude relationship of luminance of virtual pixels is not reversed.
  • a multi-primary color display device capable of improving the resolution by display using virtual pixels, it is possible to prevent the occurrence of a luminance reversal phenomenon between the input side and the output side.
  • the multi-primary color display device can perform high-quality display, it is suitably used for various electronic devices such as a liquid crystal television.
  • Multi primary color display panel 20
  • Signal conversion circuit 21
  • Low frequency multi primary color signal generation part 22
  • High frequency luminance signal generation part 23
  • Rendering processing part 24
  • ⁇ correction part 25
  • Inverse ⁇ correction part 26
  • Low frequency component extraction part (low-pass filter) 27
  • Multi-primary color conversion unit 28
  • Luminance conversion unit 29
  • High-frequency component extraction unit (high-pass filter) 100 Liquid crystal display device (multi-primary color display device) P pixel R red sub-pixel G green sub-pixel B blue sub-pixel Ye yellow sub-pixel VP1 first virtual pixel VP2 second virtual pixel

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

L'invention concerne un dispositif d'affichage à multiples couleurs primaires, qui est pourvu d'un écran d'affichage à multiples couleurs primaires et d'un circuit de conversion de signal (20) pour convertir un signal d'image d'entrée en un signal d'image à multiples couleurs primaires, et est apte à distribuer un sous-pixel rouge, un sous-pixel vert, un sous-pixel bleu et un sous-pixel jaune qui constituent un pixel dans deux pixels virtuels, et à effectuer un affichage équivalant à deux pixels qui sont adjacents dans l'image d'entrée en utilisant ces deux pixels virtuels. Le circuit de conversion de signal comprend une unité de génération de signal à multiples couleurs primaires basse fréquence (21). L'unité de génération de signal à multiples couleurs primaires basse fréquence effectue une conversion en multiples couleurs primaires d'une composante basse fréquence de manière que le rapport de la luminance absolue du sous-pixel jaune sur la somme de la luminance absolue du sous-pixel rouge et de la luminance absolue du sous-pixel vert soit de 0,5 à 2,0 inclus, si un seul des deux pixels adjacents dans l'image d'entrée présente une couleur spécifique. Ceci empêche l'apparition d'un phénomène où la relation d'amplitude de luminance entre deux pixels finit par s'inverser entre le côté entrée et le côté sortie lorsqu'on prête attention à deux pixels qui sont adjacents l'un à l'autre dans une image d'entrée.
PCT/JP2015/059427 2014-03-31 2015-03-26 Dispositif d'affichage à multiples couleurs primaires Ceased WO2015152004A1 (fr)

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JP2019008019A (ja) 2017-06-21 2019-01-17 株式会社ジャパンディスプレイ 信号処理装置及びそれを備える表示装置
JP2019032422A (ja) 2017-08-08 2019-02-28 株式会社ジャパンディスプレイ 表示装置及び画像処理方法
JP2019168595A (ja) 2018-03-23 2019-10-03 株式会社ジャパンディスプレイ 表示装置
JP2019174537A (ja) 2018-03-27 2019-10-10 株式会社ジャパンディスプレイ 表示装置
JP2020008662A (ja) 2018-07-05 2020-01-16 株式会社ジャパンディスプレイ 表示装置
JP2021189336A (ja) 2020-06-01 2021-12-13 株式会社ジャパンディスプレイ 表示装置

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CN108174193B (zh) * 2018-01-03 2019-06-14 京东方科技集团股份有限公司 一种图像处理方法和图像处理装置

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