Signal switching output device
US5177612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Jun 4, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The signal switching ouput device comprises an attenuator which attenuates a brightness of an input image signal, a first switching means which alternatively outputs an output from said attenuator or said input image signal, delay circuits which delay a character signal by a specified time, a second switch which alternatively provides an output from said first switch and a character signal delayer by the specified time, and an switch instructing means which switches between said first switch and said second switch according to said character signal, and outputs an RGB signal showing a character while delaying it and lowers a brightness level of input image signals composing a background image during a specified period before and after the output of the RGB signal, so that a character displayed on a display unit is trimmed by a dark lines and are very easy to recognize.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.