EP1569196A3 - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

Info

Publication number
EP1569196A3
EP1569196A3 EP05250788A EP05250788A EP1569196A3 EP 1569196 A3 EP1569196 A3 EP 1569196A3 EP 05250788 A EP05250788 A EP 05250788A EP 05250788 A EP05250788 A EP 05250788A EP 1569196 A3 EP1569196 A3 EP 1569196A3
Authority
EP
European Patent Office
Prior art keywords
picture
lcd display
display
brightness
liquid crystal
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Withdrawn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
EP05250788A
Other languages
German (de)
French (fr)
Other versions
EP1569196A2 (en
Inventor
Richard c/o Matsushita Electric Taylor (UK) Ltd
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP1569196A2 publication Critical patent/EP1569196A2/en
Publication of EP1569196A3 publication Critical patent/EP1569196A3/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Withdrawn legal-status Critical Current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
    • G09G3/34—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • 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
    • G09G2320/0606—Manual adjustment
    • 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
    • G09G2320/0626—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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • 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
    • G09G3/34—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

Abstract

An LCD display device such as a television or computer monitor comprises an LCD display 10, and a photo sensor 15 for sensing the ambient lighting level within a room in which the display 10 is situated. The device further comprises an electronic circuit for analysing the video content of a picture being displayed on the display 10, and a control circuit connected to both the output of the photo sensor 15 and video analysing circuit 13. The control circuit determines the brightness of a back light 11 which illuminates the LCD display 10. The brightness of the back light is dependent on the ambient lighting levels and the video content of the picture and is varied accordingly so as to optimise the contrast of the displayed picture.
EP05250788A 2004-02-11 2005-02-11 Liquid crystal display Withdrawn EP1569196A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0403077A GB2411039A (en) 2004-02-11 2004-02-11 Liquid crystal display
GB0403077 2004-02-11

Publications (2)

Publication Number Publication Date
EP1569196A2 EP1569196A2 (en) 2005-08-31
EP1569196A3 true EP1569196A3 (en) 2005-12-14

Family

ID=32011759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05250788A Withdrawn EP1569196A3 (en) 2004-02-11 2005-02-11 Liquid crystal display

Country Status (2)

Country Link
EP (1) EP1569196A3 (en)
GB (1) GB2411039A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3957730B2 (en) * 2005-06-02 2007-08-15 シャープ株式会社 Image display device
KR101330817B1 (en) * 2006-06-30 2013-11-15 엘지디스플레이 주식회사 Liquid crystal display device and driving thereof
EP2019353A3 (en) 2007-07-13 2009-02-25 TTE Indianapolis LCD device power saving system and method of reducing power consumption of LCD device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5717422A (en) * 1994-01-25 1998-02-10 Fergason; James L. Variable intensity high contrast passive display

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589022A (en) * 1983-11-28 1986-05-13 General Electric Company Brightness control system for CRT video display
KR100381423B1 (en) * 2001-07-23 2003-04-26 삼성전자주식회사 portable computer and controlling method thereof
US20040012556A1 (en) * 2002-07-17 2004-01-22 Sea-Weng Yong Method and related device for controlling illumination of a backlight of a liquid crystal display
GB0227632D0 (en) * 2002-11-27 2003-01-08 Koninkl Philips Electronics Nv Active matrix display

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5717422A (en) * 1994-01-25 1998-02-10 Fergason; James L. Variable intensity high contrast passive display

Also Published As

Publication number Publication date
GB2411039A (en) 2005-08-17
GB0403077D0 (en) 2004-03-17
EP1569196A2 (en) 2005-08-31

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