US20040051724A1 - Four color arrangements of emitters for subpixel rendering - Google Patents

Four color arrangements of emitters for subpixel rendering Download PDF

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Publication number
US20040051724A1
US20040051724A1 US10/243,094 US24309402A US2004051724A1 US 20040051724 A1 US20040051724 A1 US 20040051724A1 US 24309402 A US24309402 A US 24309402A US 2004051724 A1 US2004051724 A1 US 2004051724A1
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United States
Prior art keywords
color
subpixel
arrangement
green
red
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Abandoned
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US10/243,094
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English (en)
Inventor
Candice Elliott
Thomas Credelle
Edward Thompson
Michael Higgins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CLAIR VOYANTE LABORATORIES Inc
Samsung Electronics Co Ltd
Original Assignee
CLAIR VOYANTE LABORATORIES Inc
Clairvoyante Inc
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Priority to US10/243,094 priority Critical patent/US20040051724A1/en
Application filed by CLAIR VOYANTE LABORATORIES Inc, Clairvoyante Inc filed Critical CLAIR VOYANTE LABORATORIES Inc
Priority to US10/278,353 priority patent/US7492379B2/en
Assigned to CLAIR VOYANTE LABORATORIES, INC. reassignment CLAIR VOYANTE LABORATORIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CREDELLE, THOMAS LLOYD, ELLIOTT, CANDICE HELLEN, HIGGINS, MICHAEL FRANCIS, THOMPSON, EDWARD EASTLE
Priority to CN200810130399XA priority patent/CN101325027B/zh
Priority to EP02790121.4A priority patent/EP1461800B1/en
Priority to CN2008101303966A priority patent/CN101325025B/zh
Priority to JP2003560892A priority patent/JP4299672B2/ja
Priority to TW091136109A priority patent/TWI276886B/zh
Priority to KR1020047010456A priority patent/KR100906632B1/ko
Priority to CN2008101303970A priority patent/CN101325026B/zh
Priority to CNB028268636A priority patent/CN100439989C/zh
Priority to AU2002353143A priority patent/AU2002353143A1/en
Priority to CN2008101304009A priority patent/CN101325028B/zh
Priority to PCT/US2002/039864 priority patent/WO2003060870A1/en
Priority to EP10184890.1A priority patent/EP2270579B1/en
Assigned to CLAIRVOYANTE LABORATORIES, INC. reassignment CLAIRVOYANTE LABORATORIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CREDELLE, THOMAS LLOYD, ELLIOTT, CANDICE HELLEN BROWN, HIGGINS, MICHAEL FRANCIS
Priority to PCT/US2003/028222 priority patent/WO2004025611A2/en
Priority to KR1020057004231A priority patent/KR101010004B1/ko
Priority to AU2003270455A priority patent/AU2003270455A1/en
Priority to EP03752148A priority patent/EP1579409A2/en
Priority to KR1020107019460A priority patent/KR101066416B1/ko
Priority to KR1020107019457A priority patent/KR101066420B1/ko
Priority to CNB03821461XA priority patent/CN100510883C/zh
Priority to KR1020107019458A priority patent/KR101066413B1/ko
Priority to TW092125240A priority patent/TWI360100B/zh
Priority to TW100141805A priority patent/TWI449023B/zh
Publication of US20040051724A1 publication Critical patent/US20040051724A1/en
Assigned to CLAIRVOYANTE, INC reassignment CLAIRVOYANTE, INC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: CLAIRVOYANTE LABORATORIES, INC
Priority to US11/469,431 priority patent/US7573493B2/en
Priority to US11/469,458 priority patent/US7701476B2/en
Assigned to SAMSUNG ELECTRONICS CO., LTD reassignment SAMSUNG ELECTRONICS CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CLAIRVOYANTE, INC.
Priority to US12/715,355 priority patent/US8294741B2/en
Abandoned legal-status Critical Current

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    • 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
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    • 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
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    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
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    • 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
    • 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
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    • G09G2300/04—Structural and physical details of display devices
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    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—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
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    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0457—Improvement of perceived resolution by subpixel rendering
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Definitions

  • Most conventional subpixelated displays utilize three emitter colors, providing a color gamut that includes the inside of a triangle when charted on the 1931 CIE Color Chart, an example of which is shown in FIG. 11. These colors are typically, substantially, red 1104 , green 1106 , and blue 1102 . The luminance of these color emitters are typically unequal. For several reasons, some displays are constructed with a fourth color emitter. Prior art four color displays usually use white as the fourth color. This is typically done to increase the brightness of the display, as the colors are usually created using a color filter. The white is created by removing a color filter; and the light of the backlight which, being white already, is allowed to pass to the observer unobstructed. The four colors collectively are grouped into a pixel that may show any color within the triangle defined by the saturated colors, with the added ability to show lower saturation colors at a higher brightness by the addition of the appropriate amount of white.
  • Subpixel Rendering For displays that are to be driven using a technique known in the art as Subpixel Rendering (SPR), an example of which is disclosed the '355 application, the choice of a non-filtered white subpixel creates a serious problem.
  • Subpixel rendering depends on the ability to shift the apparent center of luminance by varying the brightness of the subpixels. This may work well when each of the colors has the same perceptual brightness.
  • the repeat cell 112 consists of four subpixels, each of a different color, often red 104 , green 106 , blue 102 , and white 108 .
  • the display is typically addressed using “whole pixel rendering” wherein the repeat cell is defined as the location of luminance information, without regard to the locations of the colored subpixels within.
  • the colors typically have chromaticity coordinates such as those shown in FIG. 11; red 1104 , green 1106 , blue 1102 , and white 1108 .
  • the white subpixel of this arrangement may typically be formed by removing the filter from the light path of a monochromatic LCD modulation pixel. This unfiltered white thus has significantly higher luminance than the other subpixels, which is typically the goal of the display designer.
  • the subpixel rendering performance is substantially impaired due to the significantly higher luminance of the white subpixel.
  • the luminance of each of the subpixels would be equal, such that for low saturation image rendering, each subpixel has the same luminance weight.
  • the human eye does not see each wavelength of light as equally bright. To the human eye, the ends of the spectrum are seen as darker than the middle. That is to say that a given energy intensity of a green wavelength is perceived to be brighter than that same energy intensity of either red or blue.
  • the short wavelength sensitive cones of the human eye the “S-cones”, those giving rise to the sensation of ‘blue’, do not feed the Human Vision System's luminance channel. As a result, blue colors appear even darker.
  • FIG. 1 shows a prior art four color arrangement for a display using a repeat cell consisting of four subpixels.
  • FIG. 2 a shows a portion of FIG. 1, six subpixels as a group.
  • FIG. 2 b shows another four-color six subpixel arrangement made in accordance with the principles of the present invention.
  • FIG. 3 shows a novel arrangement of four colors utilizing the arrangement of FIG. 2 b as the repeat cell.
  • FIG. 4 shows another novel arrangement of four colors.
  • FIG. 5A shows the arrangement of FIG. 3 with rectangular, non-square, subpixels.
  • FIG. 5B shows the arrangement of FIG. 5A with an embodiment of thin film transistors and/or associated storage capacitors comprising thereof.
  • FIG. 6A shows the arrangement of FIG. 4 with rectangular, non-square, subpixels.
  • FIG. 6B shows the arrangement of FIG. 6A with an embodiment of thin film transistors comprising thereof.
  • FIG. 7A shows another novel arrangement of four colors.
  • FIG. 7B shows the arrangement of FIG. 7A with an embodiment of thin film transistors comprising thereof.
  • FIG. 8A shows another novel arrangement of four colors.
  • FIG. 8B shows the arrangement of FIG. 8A with an embodiment of thin film transistors comprising thereof.
  • FIG. 9 shows the arrangement of FIG. 7 with a subset of the pixels smaller than the others, and a subset larger than the others.
  • FIG. 10 shows the arrangement of FIG. 8 with a subset of the pixels smaller than the others, and a subset larger than the others.
  • FIG. 11 is a chart showing the chromaticity coordinates of the emitters of a prior art four color display.
  • FIG. 12 is a chart showing the chromaticity coordinates of the emitter of a novel four color display.
  • FIG. 13 is a chart showing the chromaticity coordinates of the emitter of another novel four color display.
  • FIG. 14 is a chart showing the chromaticity coordinates of the emitter of another novel four color display.
  • FIG. 15 shows a novel arrangement of colors in which some of the subpixels have two colored regions.
  • FIG. 16 shows another novel arrangement of colors in which some of the subpixels have two colored regions.
  • FIG. 17 shows another novel arrangement of colors in which some of the subpixels have two colored regions.
  • FIG. 18 shows yet another arrangement of colors in which some of the subpixels have two colored regions.
  • FIG. 19 shows a novel arrangement of four colors consisting of a repeat cell of six subpixels.
  • FIG. 20 is a chart showing the chromaticity coordinates of the emitters of a novel four color display.
  • FIG. 21 shows a novel arrangement of four colors emitters for a display
  • FIG. 22 shows another novel arrangement of four colors.
  • FIG. 23 shows the reconstruction points and a novel set of resample areas for the arrangement of FIG. 22 overlaid a grid of implied sample areas of an input image data set in which one of the minority color plane reconstruction points is not shown for clarity.
  • FIGS. 24A and 24B show the reconstruction points and another novel set of resample areas for the arrangement of FIG. 22 in which one of the minority color plane resample areas is not shown for clarity.
  • FIG. 25 shows the reconstruction points and another novel set of resample areas for the arrangement of FIG. 22 in which one of the minority color plane resample areas is not shown for clarity.
  • FIG. 26 shows the reconstruction points and yet another novel set of resample areas for the arrangement of FIG. 22 in which one of the minority color plane resample areas is not shown for clarity.
  • FIG. 27 shows a novel arrangement of four color elements.
  • FIG. 28 is a flowchart of one embodiment for achieving subpixel rendering on a four-color subpixel arrangement.
  • the red and green subpixels may be adjusted to be of equal luminance by several techniques.
  • One embodiment comprises keeping the same chromaticity points but increase the transmission of the lower luminance filter.
  • Another embodiment would keep the same chromaticity point but decrease the transmission of the higher luminance filter.
  • Another embodiment may be to increase the energy from the backlight of the transmissive panel (e.g. LCD) in the pass band of the lower luminance color filter relative to the higher luminance color filter pass band.
  • the transmissive panel e.g. LCD
  • the relative ratio of longer wavelength emitter phosphors to the shorter wavelength could be changed to favor the longer wavelength.
  • the current or the pulse width modulated duty cycle of the longer wavelength LED could be increased.
  • Yet another embodiment narrows the pass band of the green subpixel such that the overall energy is reduced, while simultaneously shifting the chromaticity of the filter of the green subpixel. More specifically, it is possible to attenuate more of the longer wavelengths of the “green” band; while holding the red and the blue bands substantially unchanged. This may have two benefits. First, matching the luminance may allow for better subpixel rendering performance. Secondly, the reduced band pass increases the saturation and color gamut by pushing the green further from the white point. By being further from the white point, the white point of the display, with all of the subpixels turned on to maximum brightness, is allowed to remain at the desired point. The overall brightness of the display, for a given backlight will be reduced; but may be compensated for by increasing the backlight brightness.
  • Using a green subpixel that has been adjusted for lower luminance will shift the all-subpixels-on color point towards the magenta, unless compensated for in some manner.
  • One such compensation technique includes a fourth color emitting subpixel that has substantial amounts of green light.
  • the arrangements in FIGS. 1, 3, 4 , 5 , 6 , 7 , 8 , 9 , and 10 may include a fourth color emitter subpixel that has significant green (medium wavelength light) emission such as cyan, greenish-blue, greenish-grey, and the like.
  • this may be one of the four subpixels in the repeat cell group 112 , such as the lower right subpixel 108 .
  • the upper left subpixel 106 may be the luminance adjusted green.
  • the color of the lower right subpixel 108 may also be chosen to be the same as that of the upper left subpixel 1106 , thus making this arrangement a luminance adjusted, improved Bayer Pattern of three colors.
  • FIG. 27 shows another embodiment based upon the Quad arrangement of FIG. 1, in which every other column of repeat cell 112 is shifted by one subpixel. Such an arrangement scatters the Fourier signal energy of any luminance mismatch between subpixels into additional directions.
  • FIG. 1 Another embodiment using the Quad arrangement of FIG. 1 might be to chose the color points shown in FIG. 20, the four colors being red 2004 , green, 2006 , cyan 2008 , and magenta 2002 . It will be appreciated that there are a number of combinations for the choice of positions for each of the colors. All such combinations of which are to be considered to be in the scope of the present invention.
  • One advantage of these arrangements of color points 2004 , 2006 , 2008 , and 2002 is to improve subpixel rendering performance in which every color has substantial luminance such that each subpixel of a display using this arrangement is the center of a logical pixel.
  • the Quad arrangement 112 of FIG. 1 may be modified to improve subpixel rendering performance.
  • a larger group of subpixels 114 is removed from the context of the rest of the array, as in FIG. 2 a .
  • two green subpixels 206 are in the same upper row, while the two red 204 subpixels are in a same lower row.
  • an improved layout may have one of each color (red and green) in every column and row, save for the column that includes the blue—to form a red and green checkerboard.
  • the red 204 and green 206 subpixels are reversed in one of the columns, for example, the left, to form the arrangement of FIG. 2 b . It will be appreciated that interchanging the right hand column would produce the same result. Taking the arrangement of FIG. 2 b , and using it as the repeat cell 320 for a larger array, the arrangement of color subpixels is obtained as shown in FIG. 3.
  • every row contains both red 304 and green 306 subpixels in an alternating manner.
  • Two out of three columns contains both red 304 and green 306 subpixels, alternating.
  • the alternation of the red 304 and green 306 subpixels in both columns and rows forms an approximate red and green subpixel checkerboard.
  • One out of three columns contains two other colors that are in the numerical minority. These two other colors may be blue 302 and a suitable fourth color 308 .
  • the number of red subpixels 304 and the number of green subpixels 306 , per repeat cell is two each, while there is only one blue and one fourth color.
  • a desired property of a subpixelated color display may be a desired property of a subpixelated color display that, when all of the subpixels are turned on to their brightest point, the panel appears white.
  • a desired property may have all of the subpixels of the same luminance. Given these properties, a number of color combinations are possible as described herein.
  • suitable subpixel rendering could occur on a four-color arrangement whereby, when all subpixels in a group are fully “on”, the color is off the white point. It may be desirable to compensate and adjust the relative energy of each of the subpixels to display a pleasing white. This could be accomplished by electronically, or by software (machine readable medium), reducing the output of the dominant color or colors by an appropriate scaling factor.
  • the same red 1104 , blue 1102 , and green 1106 can be used.
  • the fourth color was white 1108 , as shown in FIG. 11.
  • the choice of white, adding equal parts red, green, and blue may cause the panel to have a yellowish cast when all of the pixels are turned on.
  • the white subpixel was usually formed by removing the filter over the subpixel, allowing all of the light through the subpixel, creating a very bright subpixel.
  • One improved embodiment of this arrangement is to use a neutral grey filter—keeping the same white color point, but reducing the luminance to be approximately that of the red 1104 and/or green 1106 , or somewhere between them.
  • Another improved embodiment would be to increase the amount of blue, as compared to red and green light, of the backlight, in which case the actual color point of the backlight would be more blue-ish than white.
  • the yellowish cast may be improved by increasing the color temperature of the backlight.
  • FIG. 12 Another suitable embodiment for choice of colors is shown in FIG. 12.
  • the traditional red 1204 , green 1206 , and blue 1202 are chosen, but the fourth color is selected to be “blue-grey” with the luminance set to be approximately that of the red 1102 and/or green 1104 , or somewhere between them if they are not equal.
  • the luminance may be so set either electronically or by the adjusting the filter and/or pigment as discussed above.
  • This blue-grey filter allows more blue to pass through, or emit more blue, than red and green. This is akin to using a bluer backlight.
  • a combination of a higher color temperature backlight and blue-grey filter may be used. Such a resulting system might provide a more pleasing white point for the display when all subpixels are turned on.
  • FIG. 13 still another embodiment for choice of color and luminance points uses a deeper green 1306 than that shown in either FIG. 11 or 12 .
  • green 1306 could be one that is further saturated and shifted towards the green corner, as described above.
  • this panel may have the same brightness as a traditional three color panel. The panel may exhibit lower visibility of blue subpixel related artifacts, as will be explained further below.
  • the resulting display has the further benefit of having a greater range of colors, color gamut, than the conventional three color display panels.
  • the traditional three colors create a color gamut triangular area formed by the boundaries (dark lines) running from red 1304 , green 1306 , and blue 1302 color points.
  • the addition of a fourth cyan color, outside the traditional boundary, extends the boundary (dash dot line) to include the space formed by the triangle running from the blue 1304 , green 1306 , and cyan 1308 color points.
  • FIG. 14 Yet another embodiment for choice of colors is shown in FIG. 14.
  • the traditional red 1404 , green 1406 , and blue 1402 may be chosen, but the green emitter subpixel has a lower luminance via one or more of the proposed methods above or by any other suitable method or means, more closely approximating the luminance of the red emitter subpixel, and a cyan color 1408 allowing both blue and green (short and medium wavelength) light to pass through the filter, having a luminance approximating the luminance of the red and/or green emitter subpixel, the goal and result being a pleasing white point for the display when all subpixels are turned on.
  • the panel may have the same brightness as a prior art three color panel. The panel will exhibit lower visibility of blue subpixel related artifacts as will be explained further below.
  • the resulting display has the further benefit of having a greater range of colors, color gamut, than the prior art display panels, as described above.
  • FIG. 20 Another embodiment for choice of colors is shown in FIG. 20.
  • the traditional red 2004 and green 2006 may be chosen, but the green emitter subpixel has a lower luminance via one or more of the proposed techniques above or by any other suitable techniques, more closely approximating the luminance of the red emitter subpixel.
  • Cyan color 2008 allowing both blue and green (short and medium wavelength) light to pass through the filter—is opposed to the red 2004 and a purple or magenta color is opposed to the green 2006 , both colors having a luminance approximating the luminance of the red and/or green emitter subpixel, the result being a pleasing white point for the display when all subpixels are turned on.
  • the panel may have the same brightness as a prior art three-color panel.
  • the color points of the green 2006 and magenta 2002 may be selected to provide a pleasing white point 2020 when the two colors are turned on full brightness, while the same may be true of the red and cyan.
  • the perception of a blue color 2009 may be produced by a suitable combination of intensities from the cyan 2008 and magenta 2002 .
  • the fourth color 308 is the same color as the blue 302 .
  • dark blue stripes formed by the two subpixels 302 and 308 would be seen against a bright background formed by the red 304 and green 306 subpixels.
  • Such dark stripes are strongly visible because the two dimensional spatial frequency Fourier Transform shows a single strong signal at one point in the horizontal axis.
  • the arrangements of the present invention may be improved by using the Active Matrix Layout techniques as disclosed in copending and commonly assigned U.S. patent application Ser. No. 10/024,326 entitled “Improvements to Color Flat Panel Display Sub-Pixel Arrangements and Layouts” to Elliott and herein incorporated by reference—in which the Thin Film Transistors and/or their associated storage capacitors 510 are grouped together closely, into a low luminance structure that is substantially 180° out of phase with the blue subpixels, thus increasing the apparent spatial frequency of the low luminance spots formed by the blue subpixels.
  • FIGS. 5B, 6B, 7 B, and 8 B are shown in FIGS. 5B, 6B, 7 B, and 8 B as illustrations. It will be appreciated that these TFT and capacitor groupings might apply to the other embodiments described herein.
  • the visibility of the dark blue stripes may be further reduced by switching the position of the blue and the fourth color every other column in which they reside as shown in FIG. 4. This will scatter the bulk of the “dark” Fourier energy into the three directions with some scattered into three more directions between the first three at a lower spatial frequency. With increasing division of the Fourier energy, the visibility is reduced as each spatial frequency that has energy has less visibility, the total energy being constant.
  • FIGS. 5 A- 5 B and 6 A- 6 B non-square subpixels are used as separate embodiments. These are the same relative arrangements of color emitter subpixels as FIGS. 3 and 4 respectively, but with a different repeat cell aspect ratio.
  • the aspect ratio of the repeat cell may be adjusted as desired.
  • One possible repeat cell aspect ratio is that of one-to-one (1:1), that is, a square.
  • a different ratio is shown in FIGS. 5 A- 5 B, 6 A- 6 B, 7 A- 7 B, 8 A- 8 B, 9 , and 10 .
  • This aspect ratio naturally results in the subpixels having the aspect ratio of two-to-three (2:3) as shown in the above Figures, save for the purposefully altered subpixel areas and aspect ratios of the minority color subpixels shown in FIGS. 9 and 10.
  • FIGS. 7 A- 7 B and 8 A- 8 B show the similar arrangements as FIGS. 5 A- 5 B and 6 A- 6 B respectively, save that the minority colors are shifted by some amount. These may be shifted by half the subpixel length, placing the colors 180° phase shifted from the majority subpixels.
  • the advantage of this may be that these subpixels may reconstruct high spatial frequencies with phases other than the majority subpixels in the vertical direction. The mere presence of the minority subpixels between the majority subpixels might allow these phases to be reconstructed. Spatial frequencies can be represented up to the Nyquist Limit as is well known in the art. However, that spatial frequency should be in phase with the sample and reconstruction points or the modulation depth may be reduced.
  • the modulation depth is zero.
  • spatial frequency image components of all phases may be represented, with non-zero modulation depth, up to the Nyquist Limit by the display. This improves the perceived image quality of the display considerably.
  • FIGS. 7 A- 7 B may have the advantage that the reconstruction points that the subpixels represent are four fold rotationally symmetrical, which enable rotation of the display as disclosed in copending and commonly assigned U.S. patent application Ser. No. 10/150,394 entitled “ROTATABLE DISPLAY WITH SUB-PIXEL RENDERING” to Elliott and herein incorporated by reference.
  • the arrangement of FIGS. 8 A- 8 B may have the advantage of further reduced blue pixel visibility as described above.
  • the minority subpixels have unequal areas. These embodiments allow one subpixel to emit more light of that color. This may be useful when more light of one of the minority colors is desired without increasing its per area luminance. For example, this technique may be used to increase the amount of pure blue light such that the resulting display may display bright saturated blue images. Alternatively, the smaller of the two minority subpixels may have an increased luminance to compensate for the decreased area.
  • FIGS. 15, 16, 17 , and 18 show embodiments in which a fourth-color element is fabricated as an integral part of another color subpixel.
  • This may have the advantage that the fourth-color, being of greater luminance than the conventional color, e.g. blue, will break up the stripe pattern, sending the “dark” Fourier energy into various directions to reduce the visibility of the dark stripe as earlier described. It is to be appreciated that the relative areas of the two colors may be adjusted depending on the amount of “dark” stripe visibility reduction desired and the reduction of first color saturation tolerable.
  • FIG. 15 shows a plurality of subpixels 1502 comprising two color regions, one being a first color 1503 and a second color 1505 .
  • the first color region 1503 may be a “dark” color, e.g. blue.
  • the second color region may be chosen to be one with a higher luminance has as described above.
  • each of the subpixels comprising the first color also has the second color, each in the same relative positions and area.
  • FIG. 16 shows a similar arrangement of subpixels 1602 and 1604 that comprise two colored regions 1603 and 1605 .
  • the relative positions are shifted.
  • the drawing shows only two relative positions, it will be appreciated that there is no limit on the number of relative positions of the two colored regions within the subpixels.
  • one set of two color subpixels 1604 has the second color 1605 substantially on the lower portion of the subpixel, while the second set of two color subpixels 1602 has the second color 1605 in the upper portion of the subpixel.
  • This particular arrangement further scatters the “dark” Fourier energy into additional directions as described above.
  • the second color regions 1605 having luminance and being in more than one relative position within the subpixels 1602 and 1604 , allow for additional subpixel rendering luminance reconstruction points.
  • the second colored regions 1605 being in positions that place them off of the grid formed by the centers of the majority subpixels (e.g. the red/green checkerboard), allows for reconstruction of image signals that are various phases up to the Nyquist Limit as earlier described.
  • FIG. 17 shows two classes of minority subpixels 1702 and 1704 .
  • the first class of subpixels 1702 is that of a single color.
  • the second class 1704 is comprised of two colored regions 1703 and 1705 .
  • the first colored region 1703 may comprise the same color as that of the first class 1702 of subpixels.
  • FIG. 18 shows an embodiment in which there are fewer of the two color subpixels 1802 , allowing a reduction of driver count as was disclosed in copending and commonly assigned U.S. patent application Ser. No. 09/916,232 entitled “Arrangement of Color Pixels for Full Color Imaging Devices with Simplified Addressing” to Elliott and herein incorporated by reference.
  • FIG. 19 shows a novel layout of four colors according to another aspect of the present invention.
  • the arrangement uses two majority colors 1904 and 1906 in a checkerboard. These two colors may be substantially red and green.
  • One of the minority colors 1902 or 1908 may be blue.
  • the other minority color 1908 or 1902 respectively may be chosen from a group of fourth-colors as described above.
  • One advantage of this arrangement is that the majority color subpixels are on a rectangular and/or square grid, while the minority colors are 180° out of phase with that checkerboard grid.
  • the fourth-color which may have appreciable luminance, may provide for reconstruction of signals which are out of phase with the majority color subpixel checkerboard.
  • the minority subpixels 1902 and 1908 may be the same color, e.g. blue, as a possible embodiment.
  • the blue emitting subpixels may be lower luminance than the emitters of other colors, or the green or the fourth color (white, cyan, or blue-grey) may be higher luminance than the other colors.
  • some of the objectionable artifacts caused by the differences in luminance may be reduced with the use of a suitably selected optical low-pass spatial filter. This low-pass spatial filter may blur the edges of the subpixels, reducing the visibility of the sudden, undesired, change in luminance between the subpixel color emitters.
  • Such a filter may further comprise or include an anti-glare function, the surface of the filter scattering reflected light to avoid specular reflections.
  • the filter may also comprise a Holographic Optical Element (HOE) that scatters or blurs the light emitted by the display.
  • HOE Holographic Optical Element
  • the amount of scatter or blur may be a function of both the display subpixel density and the distance from the light modulation plane.
  • the higher the density the higher the resolution may be; and the lower the total blur required to achieve the effect.
  • the further the blur filter plane is from the light modulation plane the lower the intrinsic blurring power (i.e. higher spatial frequency pass) of the filter is required.
  • the amount of blur required to improve the appearance of the subpixel rendered display is a bit more than is currently provided by the presence of conventional anti-glare filters.
  • Two further embodiments of increasing blur to a suitable level are; increasing the intrinsic scattering of the anti-glare filter, or; increasing the distance between the light modulation plane and the anti-glare filter surface. This can be achieved by introducing a thicker film, or second film, between the filter and the display substrate.
  • transmissive liquid crystal displays is exemplary and not to be construed as restricting the scope of this invention.
  • the present invention encompasses the scope of all such embodiments for adjusting the luminance and chrominance and positions of the emitters of non-transmissive display panels, such as reflective Liquid Crystal Displays, emissive ElectroLuminecent Displays (EL), Plasma Display Panels (PDP), Field Emitter Displays (FED), Electrophoretic displays, Iridescent Displays (ID), Incandescent Display, solid state Light Emitting Diode (LED) display, and Organic Light Emitting Diode (OLED) displays.
  • EL ElectroLuminecent Displays
  • PDP Plasma Display Panels
  • FED Field Emitter Displays
  • Electrophoretic displays Iridescent Displays (ID), Incandescent Display, solid state Light Emitting Diode (LED) display, and Organic Light Emitting Diode (OLED) displays.
  • Three color (red, green, & blue) subpixel arrangements have a simple one-to-one mapping of the conventional three color plane data sets (RGB).
  • Four color subpixel arrangements may not have that simple mapping.
  • the fourth color often white, may be mapped as a function of several, perhaps all, of the three color planes.
  • One embodiment uses the same area resample theory as described in the '355 application wherein the resample areas are drawn to minimize the distance from any point in the input data image to the reconstruction point grid. This allows data areas to be represented by the closest reconstruction point.
  • a novel method adds a fourth resample plane for the fourth-color. The resample areas overlap and cover the entire incoming data space, as though for its own color plane. Thus, if the incoming data comprises a four-color data format, then the shapes, and therefore, the filter coefficients are generated as per the method disclosed in the '355 application.
  • one embodiment of the method proceeds as follows: (1) determining implied sample areas for each data point of incoming four-color pixel data as in step 2802 ; (2) determining the resample area for each four-color subpixel in the display as in step 2804 ; (3) forming a set of coefficients for each said resample area as in step 2806 , whereby one possible embodiment has said coefficients comprising fractions whose denominators are a function of the resample area and the numerators are a function of an area of each said implied sample areas that may partially overlap said resample areas; (4) multiplying the incoming pixel data for each implied sample area by the coefficient resulting in a product as in step 2808 ; and (5) adding each said product to obtain luminance values for each resample area as in step 2810 .
  • the fourth color resample area grid must therefore resample from the other color planes—as a refinement of step 2804 .
  • the fourth-color is white, grey, or blue-grey
  • Wout Min ⁇ ⁇ ( ⁇ ( R m ⁇ c k ) , ⁇ ( G in ⁇ c k ) , ⁇ ( B in ⁇ c k ) )
  • C k is the filter coefficient matrix
  • R in , G in , B in are values of the red, green, and blue components of the input data set that the filter matrix is operating upon
  • W out is the value to be applied to the white, grey, or blue-grey subpixel.
  • the filter coefficient is applied to each of the color channels separately, then the minimum color component value, (i.e., the color value that has the lowest value) is selected and applied to the white, grey, or blue-grey subpixel. The minimum is chosen to minimize the change in color saturation of the image, to maintain color saturation.
  • the fourth-color is selected to represent a combination of only two color planes, for example, green and blue, by emitting light that represents these two colors together, such as cyan, then only two color planes are evaluated in calculating the value of the fourth-color subpixel:
  • C out Min ⁇ ⁇ ( ⁇ ( G in ⁇ c k ) , ⁇ ( B in ⁇ c k ) )
  • Another embodiment uses smaller resample areas for the fourth-color subpixels.
  • the total resample area does not cover the entire data space. This is to localize the effect of the data on the fourth color subpixels to increase the image sharpness.
  • the area of each fourth-color subpixel could be set equal to the area of each red and green subpixel, as it will have a similar effect on the reconstruction of the image. Such an arrangement is shown in FIG. 23.
  • FIG. 23 shows a conventional image data set overlaying a set of resample areas.
  • FIG. 23 Shown in FIG. 23 are the reconstruction points 2310 and one possible associated resample areas 2320 .
  • the blue resample areas are not shown for clarity.
  • the fourth color subpixel When data occurs in the overlap area, it is desirable for the fourth color subpixel to represent the data, shifting the luminance from the primary color to the fourth-color subpixel. However, as the fourth-color subpixel takes over this area, it is desirable to boost the effect of the non-overlap areas to keep color and brightness constant.
  • W out min ⁇ ( ⁇ R in ⁇ c k , ⁇ G in ⁇ c k , ⁇ B in ⁇ c k )
  • R out ⁇ c k1 ⁇ ( R in - 1 2 ⁇ W out ) + R in ⁇ ( c k2 + ( c k3 ⁇ 1 2 ⁇ W out ) )
  • G out ⁇ c k1 ⁇ ( G in - 1 2 ⁇ W out ) + G in ⁇ ( c k2 + ( c k3 ⁇ 1 2 ⁇ W out ) )
  • B out ⁇ c k1 ⁇ ( B in - 1 2 ⁇ W out ) + B in ⁇ ( c k2 + ( c k3 ⁇ 1 2 ⁇ W out ) ) ⁇ ⁇ OR
  • B out ⁇ c k ⁇ B in
  • c k1 is the coefficient matrix for that portion that is overlapped by both the primary color resample area and the fourth color resample areas.
  • c k2 is the coefficient matrix for the portion that is not overlapped by the fourth resample areas with respect to the total resample area for that reconstruction point.
  • the form of the expression allows the luminance energy in the overlapping resample area to be transferred to the fourth-color, while simultaneously increasing the effect of the non-overlapped area to ensure that when a full white field is present, that all of the subpixels are turned on full.
  • the use of the constant of “one half (1 ⁇ 2)” as a multiplier for the fourth color data is because when the fourth color “borrows” luminance from both the red and green, it replaces only one half of the combined red and green total.
  • the choice of using the simple or more complicated form of the formula for the blue component depends on the level of accuracy vs. computational complexity and cost that is tolerable.
  • the blue image component has negligible luminance and may exhibit greater color error before it is noted by the Human Vision System. Thus, the simplification for the blue data may be acceptable.
  • the resample areas shown in FIGS. 24A and 24B treat all of the reconstruction areas exactly in the center of the colored subpixels shown in FIG. 22, as opposed to the resample areas shown in FIG. 23 that treat the red and green reconstruction points as though they were on an idealized checkerboard for computational simplicity.
  • the value of treating the reconstruction points exactly is that the fourth-color subpixels, when considered along side the majority subpixels, may reconstruct the phase relationships of scaled input image data sets better than the idealized checkerboard of FIG. 23.
  • a randomly chosen example green reconstruction point 2406 has an associated resample area 2410 .
  • a fourth-color reconstruction point 2408 and an associated resample area 2440 are used to calculate the subpixel rendering coefficient matrix c k1 for the green subpixel associated with the reconstruction point 2406 .
  • the non-overlapping green resample area 2430 is used to calculate the subpixel rendering coefficient matrices c k2 and c k3 for the green subpixel associated with the reconstruction point 2406 .
  • green and red resample areas will overlap more than one fourth color resample area.
  • another green reconstruction point 2456 has an associated resample area 2450 .
  • This resample area is divided in four sub-resample areas 2455 , 2460 , 2470 , and 2480 .
  • the resample area 2450 overlaps three of the nearby fourth-color resample areas 2465 , 2475 , and 2485 , associated with the nearby fourth-color reconstruction points 2468 , 2478 , and 2488 respectively.
  • c k11 , c k12 , and c k13 are the coefficient matrices for that portion that is overlapped by both the primary color resample area and the 3 fourth color resample areas.
  • c k2 is the coefficient matrix for that portion that is not overlapped by the fourth resample areas with respect to the total resample area for that reconstruction point.
  • W out-1 and W out-2 and W out-3 are calculated the same as W out but from the three surrounding resample points—e.g. points 2468 , 2478 and 2488 .
  • Each implied sample area (for example, the orthogonal grid as shown in FIG. 23) from the input image data creates entries in the coefficient matrices. For each resample area, only the input data points that have an overlapping implied sample area have an entry in the associated coefficient matrix. Examining FIG. 24B, with reference where needed to FIG. 24A, an input image pixel's implied sample area 2415 is shown overlapping the green resample area 2410 and the fourth-color resample area 2440 . The input sample area 2415 is subdivided by the two overlapping resample areas.
  • One sub-area of the implied input sample area 2415 is the overlap of the input sample area 2415 and the intersection set overlap 2420 , that is itself the overlap of the green resample area 2410 and the fourth-color resample area 2440 , to form a new, triple intersection set area 2425 .
  • This area 2425 when measured by a suitable integration, divided by the total area of the green resample area 2410 , is the coefficient for the input image data point associated with the implied sample area 2415 in the coefficient matrix c k1 for the green color subpixel associated with the green reconstruction point 2406 .
  • Another sub-area of the implied input sample area 2415 is the overlap with the green resample area 2410 not overlapping the fourth-color resample area 2430 , forming a double intersection set overlap area 2435 .
  • This area 2435 divided by the area of the green resample area 2410 is the coefficient for the input image data point associated with the implied sample area 2415 in the coefficient matrix c k2 for the green color subpixel associated with the green reconstruction point 2406 .
  • This same area divided by the non-fourth-color-overlap area 2430 is the coefficient in the phantom coefficient matrix c kx ⁇ w used to calculate the modifier coefficient in the coefficient matrix c k3 .
  • the rest of the coefficients in the various matrices are derived in like manner.
  • One straight forward method of determine the area of the fourth-color resample area 2580 associated with the fourth-color reconstruction point 2588 is to define it as the overlap of the red resample area 2540 associated with the red reconstruction point 2544 and the green resample area 2560 associated with the green reconstruction point 2566 as is shown in FIG. 25.
  • the effective red resample area 2542 is thus defined as the resample area 2540 not overlapping the green resample area 2560 .
  • the effective green resample area 2562 is similarly defined as the resample area 2560 not overlapping the red resample area 2540 .
  • the fourth-color subpixel has an associated resample area 2580 coverage of the input image data set to itself.
  • c k ⁇ w is the coefficient matrix for the effective resample area for the given color reconstruction point, considering it to be the only area covered.
  • the above resample areas for the fourth-color cover the same, coincident, area in each of the color planes.
  • This coincident area may be defined by some “natural” boundaries as above, or by fiat to some other shape or shapes.
  • the fourth-color resample areas do not have to be coincident for each color plane. An example of which is described below.
  • the red resample areas 2640 associated with the red reconstruction points 2644 and green resample areas 2660 associated with green reconstruction points have been reduced in area to accommodate the fourth-color resample areas 2680 and 2689 associated with fourth color reconstruction points 2688 .
  • the fourth-color resample areas 2680 that are resampling the red color plane is not coincident with the fourth-color resample areas 2689 that are resampling the green color plane.
  • the novel arrangement of resample areas shown in FIG. 26 is generated by a modification to the algorithm that is used to generate the resample areas shown in FIGS. 24A and 24B in which the fourth-color is treated as belonging to the set of reconstruction points for the majority colors.
  • the method of generating the arrangements in FIGS. 24A and 24B is to “seed a crystal” at each reconstruction point within a color plane, then allowing the seed to grow isotropically in diameter until it “touches” another crystal, thus forming the boundaries of the resample areas. This generates boundaries in which a given random point is enclosed along with the nearest reconstruction point, in accordance with the teaching in '355 application.
  • 26 is both to include the fourth-color reconstruction points and to delay the start of the fourth-color “seed crystal” growth. By delaying the start of the “seed crystals” the fourth-color resample areas are reduced in area. The greater the delay, the smaller the fourth-color resample areas.
  • resample area 2450 the sub-resample area 2455 lies outside three overlap areas 2460 , 2470 and 2480 . Note that this area 2455 includes two separate areas that do not necessarily connect but must be taken into account.
  • C k11 , C k12 and C k13 are the coefficient matrices for sub-resample areas 2460 , 2470 and 2480 respectively.
  • Each of the three modifiers is apportioned a fraction of this matrix according to the relative size of its area.
  • the areas of sub-resample areas 2460 , 2470 and 2480 are 1557, 1557 and 1392 respectively resulting in a total of 4506.
  • C k31 0 2 0 3 29 6 0 2 0
  • C k32 0 2 0 3 29 6 0 2 0
  • C k33 0 2 0 3 26 5 0 2 0
  • FIG. 24A Examining FIG. 24A it is possible to see that all the other sub-resample areas are either identical to the ones described above, or are mirror images of the ones described.
  • the coefficient matrices calculated in the above example can simply be flipped left-to-right to create a set of matrices for the mirrored resample areas. No more calculations are necessary to produce all the coefficients necessary for this example.
  • transmissive liquid crystal displays as example embodiments is not to be construed as restricting the scope of this invention. It will be obvious to those skilled in the art, that adjusting the luminance and chrominance and positions of the emitters of non-transmissive display panels, such as reflective Liquid Crystal Displays, emissive Electro Luminescent Displays (EL), Plasma Display Panels (PDP), Field Emitter Displays (FED), Electrophoretic displays, Iridescent Displays (ID), Incandescent Displays, solid state Light Emitting Diode (LED) display, and Organic Light Emitting Diode (OLED) displays, will also be improved using this teaching and are to be considered within the scope of the present invention. Variations on the resample area definitions, coefficient matrices, and algorithms may suggest themselves to those knowledgeable in the art and should be considered to be within the scope of the present invention.

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US10/243,094 US20040051724A1 (en) 2002-09-13 2002-09-13 Four color arrangements of emitters for subpixel rendering
US10/278,353 US7492379B2 (en) 2002-01-07 2002-10-22 Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with increased modulation transfer function response
EP10184890.1A EP2270579B1 (en) 2002-01-07 2002-12-13 Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with increased modulation transfer function
PCT/US2002/039864 WO2003060870A1 (en) 2002-01-07 2002-12-13 Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with increased modulation transfer function
EP02790121.4A EP1461800B1 (en) 2002-01-07 2002-12-13 Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with increased modulation transfer function
CN2008101303966A CN101325025B (zh) 2002-01-07 2002-12-13 彩色平板显示器的子像素排列和子像素着色设置
JP2003560892A JP4299672B2 (ja) 2002-01-07 2002-12-13 変調伝達関数を向上させたサブピクセル描画用のカラー平板表示サブピクセル構成およびレイアウト
CN200810130399XA CN101325027B (zh) 2002-01-07 2002-12-13 彩色平板显示器的子像素排列和子像素着色设置
TW091136109A TWI276886B (en) 2002-01-07 2002-12-13 Improvements to color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with increased modulation transfer function response
KR1020047010456A KR100906632B1 (ko) 2002-01-07 2002-12-13 복수의 서브 픽셀 그룹을 포함하는 디스플레이와, 이러한 디스플레이를 포함하는 시스템과, 소스 픽셀 데이터 변환 방법
CN2008101303970A CN101325026B (zh) 2002-01-07 2002-12-13 彩色平板显示器的子像素排列和子像素着色设置
CNB028268636A CN100439989C (zh) 2002-01-07 2002-12-13 彩色平板显示器的子像素排列和子像素着色设置
AU2002353143A AU2002353143A1 (en) 2002-01-07 2002-12-13 Color flat panel display sub-pixel arrangements and layouts for sub-pixel rendering with increased modulation transfer function
CN2008101304009A CN101325028B (zh) 2002-01-07 2002-12-13 彩色平板显示器的子像素排列和子像素着色设置
KR1020107019457A KR101066420B1 (ko) 2002-09-13 2003-09-11 서브픽셀 렌더링을 위한 이미터의 개선된 4개 컬러 배열
PCT/US2003/028222 WO2004025611A2 (en) 2002-09-13 2003-09-11 Multi color arrangements for subpixel rendering
CNB03821461XA CN100510883C (zh) 2002-09-13 2003-09-11 子像素着色用的一些发射器的改进型4-彩色排列
KR1020107019458A KR101066413B1 (ko) 2002-09-13 2003-09-11 서브픽셀 렌더링을 위한 이미터의 개선된 4개 컬러 배열
KR1020057004231A KR101010004B1 (ko) 2002-09-13 2003-09-11 서브픽셀 렌더링을 위한 이미터의 개선된 4개 컬러 배열
AU2003270455A AU2003270455A1 (en) 2002-09-13 2003-09-11 Multi color arrangements for subpixel rendering
EP03752148A EP1579409A2 (en) 2002-09-13 2003-09-11 Multicolor arrangements for subpixel rendering
KR1020107019460A KR101066416B1 (ko) 2002-09-13 2003-09-11 서브픽셀 렌더링을 위한 이미터의 개선된 4개 컬러 배열
TW092125240A TWI360100B (en) 2002-09-13 2003-09-12 Improved displays for subpixel rendering
TW100141805A TWI449023B (zh) 2002-09-13 2003-09-12 供描繪次畫素之改良式顯示器
US11/469,458 US7701476B2 (en) 2002-09-13 2006-08-31 Four color arrangements of emitters for subpixel rendering
US11/469,431 US7573493B2 (en) 2002-09-13 2006-08-31 Four color arrangements of emitters for subpixel rendering
US12/715,355 US8294741B2 (en) 2002-09-13 2010-03-01 Four color arrangements of emitters for subpixel rendering

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US7701476B2 (en) 2010-04-20
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