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GB2005500A - A video synthesizer for a digital video display system employing a plurality of gray-scale levels - Google Patents

A video synthesizer for a digital video display system employing a plurality of gray-scale levels

Info

Publication number
GB2005500A
GB2005500A GB7834819A GB7834819A GB2005500A GB 2005500 A GB2005500 A GB 2005500A GB 7834819 A GB7834819 A GB 7834819A GB 7834819 A GB7834819 A GB 7834819A GB 2005500 A GB2005500 A GB 2005500A
Authority
GB
United Kingdom
Prior art keywords
gray
character
black
white
display system
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
GB7834819A
Other versions
GB2005500B (en
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.)
Unisys Corp
Original Assignee
Burroughs Corp
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 Burroughs Corp filed Critical Burroughs Corp
Publication of GB2005500A publication Critical patent/GB2005500A/en
Application granted granted Critical
Publication of GB2005500B publication Critical patent/GB2005500B/en
Expired 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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/24—Generation of individual character patterns
    • 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
    • G09G5/42—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of patterns using a display memory without fixed position correspondence between the display memory contents and the display position on the screen

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

In a digital video display system wherein characters are displayed in the form of images of the complete character rather than a dot-matrix pattern, a character generator stores signals representing the various characters which are retrieved from storage in response to a character code. The signals specify, in binary-coded form, the gray-scale or luminance values for the various picture elements making up the character image, and are supplied to a video synthesizer that generates the video signal to display the character images which may be displayed in a number of different modes including white-on-black, black-on-white, black- on-gray, and white-on-gray as well as different combinations of such modes to represent a cursor. The video synthesizer converts from binary-coded form to "thermometer" code which is fed to a summing network for D-to-A conversion. The voltage output signals differ from level to level in accordance with the 2.2 root of luminance. <IMAGE>
GB7834819A 1977-09-26 1978-08-29 Video synthesizer for digital video display system employiing a plurality of gray-scale levels Expired GB2005500B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83684277A 1977-09-26 1977-09-26

Publications (2)

Publication Number Publication Date
GB2005500A true GB2005500A (en) 1979-04-19
GB2005500B GB2005500B (en) 1982-07-14

Family

ID=25272868

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7834819A Expired GB2005500B (en) 1977-09-26 1978-08-29 Video synthesizer for digital video display system employiing a plurality of gray-scale levels

Country Status (5)

Country Link
JP (1) JPS5454533A (en)
CA (1) CA1102458A (en)
DE (1) DE2840005A1 (en)
FR (1) FR2404361A1 (en)
GB (1) GB2005500B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496307A1 (en) * 1980-12-16 1982-06-18 Sony Corp APPARATUS FOR PROCESSING TEXTS
EP0078087A3 (en) * 1981-10-28 1983-11-30 Philips Electronics Uk Limited Decoding binary coded colour video signals
EP0132456A1 (en) * 1983-07-29 1985-02-13 DR.-ING. RUDOLF HELL GmbH Method and device to check the sentence quality of printed matter, in particular for newspapers
EP0132454A1 (en) * 1983-07-29 1985-02-13 DR.-ING. RUDOLF HELL GmbH Method and device for the high definition typographical display of text

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4382254A (en) * 1980-06-18 1983-05-03 Nixdorf Computer Corporation Video display control circuitry
US4464777A (en) * 1980-10-22 1984-08-07 Tokyo Shibaura Denki Kabushiki Kaisha Radiography apparatus
JPS57175186U (en) * 1981-04-28 1982-11-05
DE3614422A1 (en) * 1986-04-29 1987-11-05 Siemens Ag Circuit arrangement for converting two digital signals into one analog signal for controlling the brightness of a display unit operating in accordance with the raster element method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA830119A (en) * 1963-10-16 1969-12-16 A. Cole Donald Digital storage and generation of video signals
US3527980A (en) * 1968-03-28 1970-09-08 Control Data Corp Digital variable intensity display
US3811007A (en) * 1971-11-11 1974-05-14 Tektronix Inc Facsimile method and apparatus
US3938139A (en) * 1974-12-30 1976-02-10 Young Communications Corporation Miniature display communicator
US3991301A (en) * 1975-05-29 1976-11-09 Westinghouse Electric Corporation Logarithmic frequency to voltage converter
SU734757A1 (en) * 1976-12-22 1980-05-15 Таганрогский Радиотехнический Институт Device for displaying information on crt screen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496307A1 (en) * 1980-12-16 1982-06-18 Sony Corp APPARATUS FOR PROCESSING TEXTS
EP0078087A3 (en) * 1981-10-28 1983-11-30 Philips Electronics Uk Limited Decoding binary coded colour video signals
EP0132456A1 (en) * 1983-07-29 1985-02-13 DR.-ING. RUDOLF HELL GmbH Method and device to check the sentence quality of printed matter, in particular for newspapers
EP0132454A1 (en) * 1983-07-29 1985-02-13 DR.-ING. RUDOLF HELL GmbH Method and device for the high definition typographical display of text
US4667247A (en) * 1983-07-29 1987-05-19 Dr. Ing. Rudolf Hell Gmbh Method and apparatus for checking the quality of composings for printing products, in particular newspapers

Also Published As

Publication number Publication date
JPS5454533A (en) 1979-04-28
GB2005500B (en) 1982-07-14
DE2840005A1 (en) 1979-04-05
CA1102458A (en) 1981-06-02
JPH0258635B2 (en) 1990-12-10
FR2404361A1 (en) 1979-04-20
DE2840005C2 (en) 1987-09-24

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960829