Electronic viewfinder
US4589029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1983 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | Sep 8, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electronic viewfinder comprises a plurality of picture elements which form a matrix image display device. A drive circuit is connected to the display device to cause the electronic viewfinder to selectively display a portion of the image, corresponding to the video signal being received by the drive circuit, at an increased magnification. The drive circuit includes frequency divider circuits for providing shift clock pulse signals at frequencies corresponding to the available rates of magnification of the image portion. The drive circuit further includes delay circuits for delaying synchronizing signals to select the portion of the image which is to be displayed. The electronic viewfinder having this drive circuit, is capable of providing increased resolution for a portion of an image by enlarging the image, while allowing the electronic viewfinder to be formed by a relatively small number of picture elements, so that the electronic viewfinder may be miniaturized and manufactured at a reduced cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.