Display apparatus, marker signal making process, marker signal detector circuit, and control signal generator circuit
US6674481B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1999 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jun 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/44504
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a display apparatus, a marker signal making process, a marker signal detector circuit, and a control signal generator circuit that are suitable for use when making a display in which a display screen is divided into a plurality of areas and images whose picture qualities are different at every area are displayed. Thus, in the present invention, image signals (R/G/B) from input terminals 1R, 1G, 1B are supplied to a preamplifier IC 3, e.g. to respective sharpness improving circuits 32R, 32G, 32B therein. Image signals derived from the preamplifier IC 3 are subjected to DC voltage conversion by a cutoff adjusting amplifier 6 and then supplied, e.g. to a cathode ray tube 7 as a display means. A microcomputer 40 which is present within this apparatus and controls various kinds of functions forms first and second DC voltage data for controlling, e.g. the sharpness. These data are made into analog control DC voltage by D/A converters 34A, 34B and then selected by a switching circuit 36 to be supplied to the preamplifier IC 3. This switching circuit 36 is controlled by an arbitrary control signal. This enables the picture quality of image of photograph, mo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.