Addressing a matrix device using electro-optical switching
US5237314A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Oct 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/3674
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an addressable matrix device, for example an active matrix liquid crystal display device comprising a panel (10) having a row and column array of addressable picture elements (12), in which the elements are addressed via sets of row and column address conductors (14,16) by row and column drive circuits (24,26) providing sequential outputs, at least one of the circuits (24,26) consists of a sequence generator (28,29) comprising an electro-optic switching arrangement having light sensitive means including light sensitive elements (42), e.g. photodiodes, integrated on the panel and controlling the outputs of individual output stages (38) and light emitting means (35) including a plurality of light emitting elements (36) cooperating with the light sensitive elements, the light emitting elements being selectively operable to produce a sequence of outputs from the output stages, for example in order to scan the row address conductors. The electro-optic switching arrangement requires comparatively few external connections to the panel and is of simple form so that high yields are obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.