EP0363204A3 - Generation of raster scan video signals for an enhanced resolution monitor - Google Patents

Generation of raster scan video signals for an enhanced resolution monitor Download PDF

Info

Publication number
EP0363204A3
EP0363204A3 EP19890310209 EP89310209A EP0363204A3 EP 0363204 A3 EP0363204 A3 EP 0363204A3 EP 19890310209 EP19890310209 EP 19890310209 EP 89310209 A EP89310209 A EP 89310209A EP 0363204 A3 EP0363204 A3 EP 0363204A3
Authority
EP
European Patent Office
Prior art keywords
video
multiplexer
output signal
receive
information
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
EP19890310209
Other languages
German (de)
French (fr)
Other versions
EP0363204B1 (en
EP0363204A2 (en
Inventor
Anthony John Matthews
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.)
Research Machines PLC
Original Assignee
Research Machines PLC
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 Research Machines PLC filed Critical Research Machines PLC
Publication of EP0363204A2 publication Critical patent/EP0363204A2/en
Publication of EP0363204A3 publication Critical patent/EP0363204A3/en
Application granted granted Critical
Publication of EP0363204B1 publication Critical patent/EP0363204B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/28—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using colour tubes
    • G09G1/285—Interfacing with colour displays, e.g. TV receiver
    • G—PHYSICS
    • 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
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39—Control of the bit-mapped memory
    • G09G5/391—Resolution modifying circuits, e.g. variable screen formats

Abstract

The converter circuit (3) provides for the generation of a raster scan video signal to an enhanced resolution monitor in either a first, high resolution mode or a second, low resolution mode, the circuit (3) comprises: a video timing generator (7) connected to receive timing signals from the video adaptor (1); a multiplexer (11) connected to receive a video output signal from the video adaptor (1); a video line buffer (6) connected to receive the video output signal from the video adaptor (1) and connected to the multiplexer (11); and output means (9) connected to receive a video output signal from the multiplexer (11) for providing a video output signal to an enhanced resolution monitor, and converter circuit (3) being selectively operable in a first mode in which video information from the video adapter (1) is converted by the multiplexer (11) for a high resolution, monochrome display and then provided to the output means (9), and a second mode in which video information for a low resolution, multi-colour display is received by the multiplexer (11) from the video adapter (1) via the buffer (6) such that each pixel of information is read out twice from the buffer (6) and each line of information is read out twice to provide the output means (9) with a video output signal of a low resolution display to be produced on an enhanced resolution monitor.
EP19890310209 1988-10-07 1989-10-05 Generation of raster scan video signals for an enhanced resolution monitor Expired - Lifetime EP0363204B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8823628A GB2229344B (en) 1988-10-07 1988-10-07 Generation of raster scan video signals for an enhanced resolution monitor
GB8823628 1988-10-07

Publications (3)

Publication Number Publication Date
EP0363204A2 EP0363204A2 (en) 1990-04-11
EP0363204A3 true EP0363204A3 (en) 1991-12-27
EP0363204B1 EP0363204B1 (en) 1996-02-28

Family

ID=10644897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890310209 Expired - Lifetime EP0363204B1 (en) 1988-10-07 1989-10-05 Generation of raster scan video signals for an enhanced resolution monitor

Country Status (3)

Country Link
EP (1) EP0363204B1 (en)
DE (1) DE68925775T2 (en)
GB (1) GB2229344B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5179639A (en) * 1990-06-13 1993-01-12 Massachusetts General Hospital Computer display apparatus for simultaneous display of data of differing resolution
JPH09307744A (en) * 1996-05-10 1997-11-28 Oki Data:Kk Resolution conversion method and resolution conversion device
US10885883B2 (en) 2017-01-25 2021-01-05 Apple Inc. Electronic device with foveated display system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157927A (en) * 1984-04-16 1985-10-30 Gould Inc Circuit for processing digital image data in a high resolution raster display
EP0258560A2 (en) * 1986-08-25 1988-03-09 International Business Machines Corporation Raster display controller with variable spatial resolution and pixel data depth
EP0264603A2 (en) * 1986-10-14 1988-04-27 International Business Machines Corporation Raster scan digital display system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484188A (en) * 1982-04-23 1984-11-20 Texas Instruments Incorporated Graphics video resolution improvement apparatus
GB2207029A (en) * 1987-07-14 1989-01-18 Silicongraphics Inc Computer system for converting a higher resolution image to a lower resolution image

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157927A (en) * 1984-04-16 1985-10-30 Gould Inc Circuit for processing digital image data in a high resolution raster display
EP0258560A2 (en) * 1986-08-25 1988-03-09 International Business Machines Corporation Raster display controller with variable spatial resolution and pixel data depth
EP0264603A2 (en) * 1986-10-14 1988-04-27 International Business Machines Corporation Raster scan digital display system

Also Published As

Publication number Publication date
EP0363204B1 (en) 1996-02-28
DE68925775T2 (en) 1996-09-05
GB8823628D0 (en) 1988-11-16
DE68925775D1 (en) 1996-04-04
GB2229344B (en) 1993-03-10
GB2229344A (en) 1990-09-19
EP0363204A2 (en) 1990-04-11

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