EP2337014A1 - Dispositif d'affichage couleur avec rétroéclairage - Google Patents

Dispositif d'affichage couleur avec rétroéclairage Download PDF

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Publication number
EP2337014A1
EP2337014A1 EP09179604A EP09179604A EP2337014A1 EP 2337014 A1 EP2337014 A1 EP 2337014A1 EP 09179604 A EP09179604 A EP 09179604A EP 09179604 A EP09179604 A EP 09179604A EP 2337014 A1 EP2337014 A1 EP 2337014A1
Authority
EP
European Patent Office
Prior art keywords
backlight
display
white
color
colors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09179604A
Other languages
German (de)
English (en)
Inventor
Petrus Maria De Greef
Matheus Johannus Gerardus Lammers
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.)
NXP BV
Original Assignee
NXP BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NXP BV filed Critical NXP BV
Priority to EP09179604A priority Critical patent/EP2337014A1/fr
Publication of EP2337014A1 publication Critical patent/EP2337014A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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

Definitions

  • This invention aims to provide improved backlight brightness for proper color reproduction of regions with bright, saturated pixels, as well as regions with bright unsaturated pixels.
  • the invention aims to provide this improvement of overall picture quality, but also reduce the power consumption and reduce the cost of the system.
  • the visual output of the display in response to driving to different colors should be predictable and consistent with relevant standards.
  • the sRGB standard indicates the desired relative brightness of different colors, and a display should provide these outputs in response to driving to the different colors.
  • the display can comprise a color field sequential display.
  • the backlight of the invention is combined with a color field sequential LCD panel, the power efficiency and cost improves significantly, when matching the color reproduction aspect of the panel and RGBW backlight system to the sRGB standard format.
  • the backlight comprises segments, wherein the intensity of the four colors within each segment can be controlled independently of the other segments.
  • This provides local dimming capability, so that the efficiency of the display can be improved, and the control of the backlight can be made dependent on the image content. 2D dimming is made possible by providing segments which divide the backlight area into rows and columns, so that the backlight has the form of a grid (of coarser resolution that the grid of pixels of the display panel).
  • Local dimming and boosting can be used for image-content adaptive backlight and video brightness modulation. More local backlight brightness is provided for the required proper color reproduction of pixels and less local backlight brightness is used for the reduction of power consumption.
  • Figure 1 shows a cross section of the color space for an RGB LCD display panel. This shows the luminance (Y axis) for three colors (blue, white, yellow) and the evolution of this luminance when moving linearly between blue and yellow (via white) in the 2D color space (x,y axis).
  • Figure 2 shows a similar cross section of the color space for an RGBW display panel (i.e. a system with white backlight and four sub-pixels per pixel).
  • Figure 3 shows a cross section of the color space for an RGBW panel with RGBW backlight of the invention.
  • the transparent sub-pixels also transmit the backlight color component, twice the transparency can be achieved for saturated colors.
  • the blue LED has 25% of the possible output brightness (instead of 33% for an RGB backlight) but the pixel aperture available is 1/2 (B+W pixel aperture) instead of 1/3 (B pixel aperture only).
  • B+W pixel aperture 1/2 (B+W pixel aperture) instead of 1/3 (B pixel aperture only).
  • 150% of the required brightness can be generated at full saturation.
  • the color profile can be reshaped to match the sRGB standard (or other desired standard).
  • FIG. 6 shows in schematic form an RGB LED backlight, in which red 60, green 62 and blue 64 LED die are mounted in a single package.
  • R,G and B LEDs When R,G and B LEDs are turned on they generate light with a spectrum with peaks at red, green and blue wavelengths, corresponding to the driving levels of the red, green and blue LEDs, creating colored or white light.
  • the design should have some optical crosstalk between the LED packages to guarantee a uniform luminance exposure of the LCD panel.
  • RGB 0.4, 0.2, 0.8 corresponds to RGBW: 0.2, 0.0, 0.6, 0.2.
  • Figure 14 shows the effect of this backlight dimming 140 and boosting 142 on the color space, and enables the luminance of the image to be mapped to sRGB color space.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP09179604A 2009-12-17 2009-12-17 Dispositif d'affichage couleur avec rétroéclairage Withdrawn EP2337014A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09179604A EP2337014A1 (fr) 2009-12-17 2009-12-17 Dispositif d'affichage couleur avec rétroéclairage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09179604A EP2337014A1 (fr) 2009-12-17 2009-12-17 Dispositif d'affichage couleur avec rétroéclairage

Publications (1)

Publication Number Publication Date
EP2337014A1 true EP2337014A1 (fr) 2011-06-22

Family

ID=41533810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09179604A Withdrawn EP2337014A1 (fr) 2009-12-17 2009-12-17 Dispositif d'affichage couleur avec rétroéclairage

Country Status (1)

Country Link
EP (1) EP2337014A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9171509B2 (en) 2013-04-19 2015-10-27 VIZIO Inc. Single backlight source where the backlight emits pure colored light in a sequential manner where the sequence is red, blue and green
US9324250B2 (en) 2011-09-09 2016-04-26 Dolby Laboratories Licensing Corporation High dynamic range displays comprising MEMS/IMOD components
US10204572B2 (en) 2015-04-08 2019-02-12 Au Optronics Corp. Display apparatus of multi-color light sources and driving method thereof
US10511830B2 (en) 2016-09-30 2019-12-17 Delta Electronics, Inc. Multi-view display

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030214725A1 (en) * 2002-03-27 2003-11-20 Citizen Watch Co., Ltd Color display device
US20070152953A1 (en) * 2005-12-29 2007-07-05 Lg.Philps Lcd Co., Ltd. Liquid crystal display device and apparatus and method for driving the same
WO2007132364A1 (fr) * 2006-05-09 2007-11-22 Koninklijke Philips Electronics N.V. Dispositif d'affichage avec un rétroéclairage
US20090267879A1 (en) * 2006-10-27 2009-10-29 Sharp Kabushiki Kaisha Liquid crystal display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030214725A1 (en) * 2002-03-27 2003-11-20 Citizen Watch Co., Ltd Color display device
US20070152953A1 (en) * 2005-12-29 2007-07-05 Lg.Philps Lcd Co., Ltd. Liquid crystal display device and apparatus and method for driving the same
WO2007132364A1 (fr) * 2006-05-09 2007-11-22 Koninklijke Philips Electronics N.V. Dispositif d'affichage avec un rétroéclairage
US20090267879A1 (en) * 2006-10-27 2009-10-29 Sharp Kabushiki Kaisha Liquid crystal display device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"SID Symposium Digest of Technical Papers", vol. 38, part 1 May 2007, SID, article PIERRE DE GREEF AND HENDRIEK GROOT HULZE: "Adaptive Dimming and Boosting Backlight for LCD-TV Systems", pages: 1332 - 1335, XP002565813 *
MICHAEL STOKES,MATTHEW ANDERSON,SRINIVASAN CHANDRASEKAR,RICARDO MOTTA: "A Standard Default Color Space for the Internet - sRGB", 5 November 1996 (1996-11-05), XP002568510, Retrieved from the Internet <URL:http://www.w3.org/Graphics/Color/sRGB> [retrieved on 20100212] *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9324250B2 (en) 2011-09-09 2016-04-26 Dolby Laboratories Licensing Corporation High dynamic range displays comprising MEMS/IMOD components
US9171509B2 (en) 2013-04-19 2015-10-27 VIZIO Inc. Single backlight source where the backlight emits pure colored light in a sequential manner where the sequence is red, blue and green
US10204572B2 (en) 2015-04-08 2019-02-12 Au Optronics Corp. Display apparatus of multi-color light sources and driving method thereof
US10511830B2 (en) 2016-09-30 2019-12-17 Delta Electronics, Inc. Multi-view display

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