Versatile video CRT display
US4361785A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1979 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Oct 1, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K6/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube display system for displaying data and/or pictorial images in an undistorted manner over the entire display screen. Programmable video polarity circuits add versatility to the system, enabling the cathode ray tube to be driven by any one of a variety of different drive circuits and effectively eliminating any skewing or delay experienced by the control signals as a result of the particular drive circuitry employed. Versatile deflection of the cathode ray tube electron beam at low power levels is achieved through the use of deflection circuitry employing a feedback circuit for achieving linearity and a totem pole circuit employing a coupling diode for achieving rapid, automatic flyback during the retrace portion of the deflection cycle. Automatic sizing of the display generated by the cathode ray tube (CRT) is obtained regardless of changes in the operating frequency of the horizontal and vertical sync signals employed to control the cathode ray tube. The sizing circuitry employs solid-state timer circuits, preferably of the integrated circuit type, which generate the necessary horizontal and vertical sweep circuits regardless of frequency changes experienced by t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.