Microcomputer controlled display backlight
US4868563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Sep 25, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for controlling the illumination of a display used to prevent messages in a pager is described. A microcomputer is used for controlling the operation of the display in response to a read switch being actuated. A light switch, coupled to an illumination circuit provides display illumination upon the light switch being manually activated. The microcomputer also couples to the light switch to allow monitoring of the switch actuation. Upon actuation of the light switch, when a message is being displayed, the microcomputer will maintain the illumination of the display, even after the light switch has been released. Once the message has been read, the microcomputer resumes monitoring the light switch, and the illumination of the display is terminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.