Programmable timing circuit for cathode ray tube
US4644340A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1983 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Dec 19, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A programmable timing circuit for a cathode ray tube includes a register stack (48) in which events to be timed are stored so that they are presented to comparators (45, 46 or 47) in the sequence in which they will occur. Each event is coded in terms of the position (character, line or row) on the screen at which it is to occur and flags stored with the values are decoded to identify the event being timed when a match is found between the presented value and the count in a character, line or row counter (40, 41 or 42) which is indicative of the current beam position on the screen. Values in the register stack can also control internal operations of the timing circuit, for example re-setting counters or re-addressing the stack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.