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US5021719A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1989 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Dec 12, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/22
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a display apparatus in which peculiar synchronizing signals fed while being accompanied by a video signal to be displayed are recognized, control signals for instructing picture scene size (display size) and picture display position optimum to the recognized synchronizing signals are generated by a digital automatic tracking circuit or the like, and horizontal and vertical deflection circuits are operated by the thus generated control signals so that a picture scene having optimum picture scene size and optimum display position is displayed on a display screen. The display apparatus is provided with: a synchronizing signal processing circuit for processing peculiar synchronizing signals fed thereto while being accompanied by the video signal so as to produce a horizontal synchronizing signal repeatedly occurring with a horizontal period and a vertical synchronizing signal repeatedly occurring with a vertical period; a memory for storing control information in advance; and a control processing circuit for recognizing a horizontal scanning frequency and a vertical scanning frequency on the basis of the horizontal synchronizing signal and the vertical synchronizing signal…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.