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 levelsInfo
- 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
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)
- Transforming Electric Information Into Light Information (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Picture Signal Circuits (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>
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2496307A1 (en) * | 1980-12-16 | 1982-06-18 | Sony Corp | APPARATUS FOR PROCESSING TEXTS |
EP0078087A2 (en) * | 1981-10-28 | 1983-05-04 | 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)
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)
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 |
-
1978
- 1978-08-29 GB GB7834819A patent/GB2005500B/en not_active Expired
- 1978-09-06 CA CA310,784A patent/CA1102458A/en not_active Expired
- 1978-09-12 JP JP11287578A patent/JPS5454533A/en active Granted
- 1978-09-12 FR FR7826182A patent/FR2404361A1/en active Pending
- 1978-09-14 DE DE19782840005 patent/DE2840005A1/en active Granted
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2496307A1 (en) * | 1980-12-16 | 1982-06-18 | Sony Corp | APPARATUS FOR PROCESSING TEXTS |
EP0078087A2 (en) * | 1981-10-28 | 1983-05-04 | Philips Electronics Uk Limited | Decoding binary coded colour video signals |
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 |
---|---|
GB2005500B (en) | 1982-07-14 |
CA1102458A (en) | 1981-06-02 |
DE2840005C2 (en) | 1987-09-24 |
JPS5454533A (en) | 1979-04-28 |
JPH0258635B2 (en) | 1990-12-10 |
FR2404361A1 (en) | 1979-04-20 |
DE2840005A1 (en) | 1979-04-05 |
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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 |