CA2079352A1 - Display system - Google Patents

Display system

Info

Publication number
CA2079352A1
CA2079352A1 CA2079352A CA2079352A CA2079352A1 CA 2079352 A1 CA2079352 A1 CA 2079352A1 CA 2079352 A CA2079352 A CA 2079352A CA 2079352 A CA2079352 A CA 2079352A CA 2079352 A1 CA2079352 A1 CA 2079352A1
Authority
CA
Canada
Prior art keywords
gray
gray level
gray levels
dot
power
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.)
Granted
Application number
CA2079352A
Other languages
French (fr)
Other versions
CA2079352C (en
Inventor
Shigeki Asada
Masayuki Sohda
Hiroaki Yasuda
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.)
International Business Machines Corp
Original Assignee
Shigeki Asada
Masayuki Sohda
Hiroaki Yasuda
International Business Machines Corporation
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 Shigeki Asada, Masayuki Sohda, Hiroaki Yasuda, International Business Machines Corporation filed Critical Shigeki Asada
Publication of CA2079352A1 publication Critical patent/CA2079352A1/en
Application granted granted Critical
Publication of CA2079352C publication Critical patent/CA2079352C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/153—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using cathode-ray tubes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
    • G06F3/1475—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels with conversion of CRT control signals to flat panel control signals, e.g. adapting the palette memory
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0414—Vertical resolution change
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0421—Horizontal resolution change
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0442—Handling or displaying different aspect ratios, or changing the aspect ratio
    • 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

Abstract

A personal computer generates first gray level signals each dot of which is represented by N bits (where N is an integer larger than or equal to 2) representing 2N (the Nth. power of 2) gray levels. The first gray level signal is supplied to a CRT display, each dot of which displays 2N (the Nth.
power of 2) gray levels. Now, the CRT is replaced by an LCD, each dot of which displays 2M (the Mth. power of 2) gray levels. An algorithm converts the first gray level signal of N bits representing 2N gray levels to second gray level signals representing 2M gray levels. The second gray level signals are applied to the LCD. The invention solves a problem raised when an algorithm is used to generate an image for LCDs and that image is expanded in a vertical direction.
CA002079352A 1991-12-03 1992-09-24 Display system Expired - Fee Related CA2079352C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3318813A JPH0772824B2 (en) 1991-12-03 1991-12-03 Display system
JP318813/91 1991-12-03

Publications (2)

Publication Number Publication Date
CA2079352A1 true CA2079352A1 (en) 1993-06-04
CA2079352C CA2079352C (en) 1997-05-13

Family

ID=18103233

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002079352A Expired - Fee Related CA2079352C (en) 1991-12-03 1992-09-24 Display system

Country Status (10)

Country Link
US (1) US5272471A (en)
EP (1) EP0545577B1 (en)
JP (1) JPH0772824B2 (en)
KR (1) KR950014981B1 (en)
CN (1) CN1040805C (en)
CA (1) CA2079352C (en)
DE (1) DE69231642T2 (en)
ES (1) ES2153354T3 (en)
SG (1) SG43735A1 (en)
TW (1) TW216475B (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5500924A (en) * 1992-05-07 1996-03-19 Apple Computer, Inc. Method for vector plotting a bitmap with a reduced number of lines
US6118429A (en) * 1993-09-30 2000-09-12 Hitachi, Ltd. Liquid crystal display system capable of reducing and enlarging resolution of input display data
US5726718A (en) * 1994-09-30 1998-03-10 Texas Instruments Incorporated Error diffusion filter for DMD display
JP3354741B2 (en) * 1995-04-17 2002-12-09 富士通株式会社 Halftone display method and halftone display device
US5977933A (en) * 1996-01-11 1999-11-02 S3, Incorporated Dual image computer display controller
US5990858A (en) * 1996-09-04 1999-11-23 Bloomberg L.P. Flat panel display terminal for receiving multi-frequency and multi-protocol video signals
US6295041B1 (en) * 1997-03-05 2001-09-25 Ati Technologies, Inc. Increasing the number of colors output by an active liquid crystal display
EP0994457B1 (en) * 1998-10-12 2007-09-05 Victor Company Of Japan, Limited Apparatus and method of gray scale video signal processing for matrix display apparatus
JP4637315B2 (en) 1999-02-24 2011-02-23 株式会社半導体エネルギー研究所 Display device
US7193594B1 (en) * 1999-03-18 2007-03-20 Semiconductor Energy Laboratory Co., Ltd. Display device
US7145536B1 (en) 1999-03-26 2006-12-05 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device
US6952194B1 (en) 1999-03-31 2005-10-04 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device
US6753854B1 (en) * 1999-04-28 2004-06-22 Semiconductor Energy Laboratory Co., Ltd. Display device
US6590581B1 (en) * 1999-05-07 2003-07-08 Semiconductor Energy Laboratory Co., Ltd. Display device
JP3357666B2 (en) 2000-07-07 2002-12-16 松下電器産業株式会社 Display device and display method
US7330162B2 (en) * 2002-02-28 2008-02-12 Semiconductor Energy Laboratory Co., Ltd. Method of driving a light emitting device and electronic equipment
TWI350501B (en) * 2006-09-20 2011-10-11 Novatek Microelectronics Corp Method for dithering image data
CN201081774Y (en) * 2006-12-21 2008-07-02 比亚迪股份有限公司 Radial circuit for driving LCD
TWI395195B (en) * 2008-07-30 2013-05-01 Orise Technology Co Ltd Method for applying the same dithering table for different flat panels and display driving method thereof
WO2011077926A1 (en) 2009-12-24 2011-06-30 Semiconductor Energy Laboratory Co., Ltd. Display device and electronic device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6069207A (en) * 1983-09-14 1985-04-19 Mazda Motor Corp Eccentric shaft of multicylinder rotary piston engine
EP0270259B1 (en) * 1986-12-04 1995-02-01 Quantel Limited Improvements relating to video signal processing systems
JPH0743580B2 (en) * 1988-09-22 1995-05-15 インターナショナル・ビジネス・マシーンズ・コーポレーション How to convert gray scale
WO1990003019A1 (en) * 1988-09-16 1990-03-22 Chips And Technologies, Inc. Compensation method and circuitry for flat panel display
US4956638A (en) * 1988-09-16 1990-09-11 International Business Machines Corporation Display using ordered dither
JPH0650522B2 (en) * 1988-09-22 1994-06-29 インターナショナル・ビジネス・マシーンズ・コーポレーション Display system
US5068649A (en) * 1988-10-14 1991-11-26 Compaq Computer Corporation Method and apparatus for displaying different shades of gray on a liquid crystal display
EP0378780B1 (en) * 1989-01-13 1994-05-04 International Business Machines Corporation Error propagated image halftoning with time-varying phase shift

Also Published As

Publication number Publication date
KR950014981B1 (en) 1995-12-20
DE69231642D1 (en) 2001-02-22
CN1073027A (en) 1993-06-09
EP0545577A2 (en) 1993-06-09
CN1040805C (en) 1998-11-18
CA2079352C (en) 1997-05-13
DE69231642T2 (en) 2001-06-21
ES2153354T3 (en) 2001-03-01
EP0545577A3 (en) 1995-12-20
JPH0772824B2 (en) 1995-08-02
JPH05241545A (en) 1993-09-21
US5272471A (en) 1993-12-21
KR930013976A (en) 1993-07-22
SG43735A1 (en) 1997-11-14
EP0545577B1 (en) 2001-01-17
TW216475B (en) 1993-11-21

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