EP1768088A3 - Method and device for encoding luminance values into subfield code words in a display device - Google Patents

Method and device for encoding luminance values into subfield code words in a display device Download PDF

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Publication number
EP1768088A3
EP1768088A3 EP06120447A EP06120447A EP1768088A3 EP 1768088 A3 EP1768088 A3 EP 1768088A3 EP 06120447 A EP06120447 A EP 06120447A EP 06120447 A EP06120447 A EP 06120447A EP 1768088 A3 EP1768088 A3 EP 1768088A3
Authority
EP
European Patent Office
Prior art keywords
subfield code
display device
code word
sub
code words
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Withdrawn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
EP06120447A
Other languages
German (de)
French (fr)
Other versions
EP1768088A2 (en
Inventor
Cédric Thebault
Carlos Correa
Sébastien Weitbruch
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.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
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
Priority claimed from EP05291973A external-priority patent/EP1768087A1/en
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP06120447A priority Critical patent/EP1768088A3/en
Publication of EP1768088A2 publication Critical patent/EP1768088A2/en
Publication of EP1768088A3 publication Critical patent/EP1768088A3/en
Withdrawn legal-status Critical Current

Links

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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/0266—Reduction of sub-frame artefacts
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2044—Display of intermediate tones using dithering
    • G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods

Landscapes

  • Engineering & Computer Science (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)

Abstract

The invention relates to a method and a device for encoding the luminance value of a pixel of a picture into a subfield code word in a display device. It can be applied to every display device using a PWM (Pulse Width Modulation) technology and subfields for displaying video picture. It can be used to compensate for any luminance problem that can be estimated. The general idea of the recursive coding is to encode one sub-field after the other in order to be able to compensate for problems occurring on one sub-field with the other sub-fields. More particularly, the bits of a subfield code word are computed recursively one after the other such that the defects (e.g. line load and/or linearity) in the light emission or luminance generated by a bit of the subfield code word can be compensated by the following bits of the subfield code word.
EP06120447A 2005-09-22 2006-09-11 Method and device for encoding luminance values into subfield code words in a display device Withdrawn EP1768088A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06120447A EP1768088A3 (en) 2005-09-22 2006-09-11 Method and device for encoding luminance values into subfield code words in a display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05291973A EP1768087A1 (en) 2005-09-22 2005-09-22 Method and device for recursively encoding luminance values into subfield code words in a display device
EP06120447A EP1768088A3 (en) 2005-09-22 2006-09-11 Method and device for encoding luminance values into subfield code words in a display device

Publications (2)

Publication Number Publication Date
EP1768088A2 EP1768088A2 (en) 2007-03-28
EP1768088A3 true EP1768088A3 (en) 2009-05-13

Family

ID=37762184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06120447A Withdrawn EP1768088A3 (en) 2005-09-22 2006-09-11 Method and device for encoding luminance values into subfield code words in a display device

Country Status (1)

Country Link
EP (1) EP1768088A3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2006829A1 (en) 2007-06-18 2008-12-24 Deutsche Thomson OHG Method and device for encoding video levels into subfield code word

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5596349A (en) * 1992-09-30 1997-01-21 Sanyo Electric Co., Inc. Image information processor
EP0822536A2 (en) * 1996-07-29 1998-02-04 Fujitsu Limited Method of and apparatus for displaying halftone images
EP0973147A1 (en) * 1997-03-31 2000-01-19 Matsushita Electronics Corporation Dynamic image display method and device therefor
US6069609A (en) * 1995-04-17 2000-05-30 Fujitsu Limited Image processor using both dither and error diffusion to produce halftone images with less flicker and patterns
US6100859A (en) * 1995-09-01 2000-08-08 Fujitsu Limited Panel display adjusting number of sustaining discharge pulses according to the quantity of display data
WO2005041162A1 (en) * 2003-10-15 2005-05-06 Thomson Licensing Method and apparatus for processing video pictures for display on a display device
WO2005059879A1 (en) * 2003-12-17 2005-06-30 Thomson Licensing Method and device for reducing line load effect

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5596349A (en) * 1992-09-30 1997-01-21 Sanyo Electric Co., Inc. Image information processor
US6069609A (en) * 1995-04-17 2000-05-30 Fujitsu Limited Image processor using both dither and error diffusion to produce halftone images with less flicker and patterns
US6100859A (en) * 1995-09-01 2000-08-08 Fujitsu Limited Panel display adjusting number of sustaining discharge pulses according to the quantity of display data
EP0822536A2 (en) * 1996-07-29 1998-02-04 Fujitsu Limited Method of and apparatus for displaying halftone images
EP0973147A1 (en) * 1997-03-31 2000-01-19 Matsushita Electronics Corporation Dynamic image display method and device therefor
WO2005041162A1 (en) * 2003-10-15 2005-05-06 Thomson Licensing Method and apparatus for processing video pictures for display on a display device
WO2005059879A1 (en) * 2003-12-17 2005-06-30 Thomson Licensing Method and device for reducing line load effect

Also Published As

Publication number Publication date
EP1768088A2 (en) 2007-03-28

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