Current control apparatus in which the beam current for all three colors is controlled according to average and peak values
US4703345A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1984 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Dec 19, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/141
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube beam current control apparatus for controlling the beam current in a plurality of cathode ray tubes each of which produce different colors wherein each of the cathode ray tubes have a current source circuit which is connected to a respective cathode of each of the cathode ray tubes and a current sink circuit which is connected to the cathode of each of the cathode ray tubes as well as a circuit for substracting the current of the current source circuit from the current of the current sink circuit and each cathode ray tube includes a control circuit which receives an input from the output of the circuit for subtracting and is connected to each of the cathode ray tubes so as to control their luminescence level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.