Cathode-ray tube display apparatus
US4274094A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Jun 5, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided in a video amplifier circuit in accordance with the present invention is a first switching element which receives input video signals and makes a switching action, a second switching element which receives input dual intensity signals for shifting the intensity level of selected parts of the images, and a video signal amplifying stage. Also provided is a variable voltage feeding circuit, a power supply terminal, a transistor connected by its collector substantially to said power supply terminal and by its emitter to an output terminal of said first switching element and to an input terminal of said video signal amplifier stage, a diode connected between a variable voltage output terminal of said variable voltage feeding circuit and the base of said transistor in the direction backward to that of the base current of said transistor and a base resistor connected to said base to feed the base current of said transistor whereby the display intensity of the accentuated brighter characters is made free from adjustment setting of the display intensity of the non-accentuated characters and the highest display intensity of the non-accentuated characters is made the same as that of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.