Liquid crystal input/output matrix panel
US4679909A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/36
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Numerous photoelectric translation cells are arranged to correspond to associated picture elements in an active type matrix LCD display system. When a light pen is used as an input means, the system allows detection of light beam positions, enabling it to function as an input means. The liquid crystal input/output system constructed in this manner has advantages of low power consumption and thin and lightweight construction as compared with conventional input/output systems using a combination of CRT and light pen. It is best suited for applications in portable electronic appliances and offers great technical benefit by arranging the photoelectric translation cells in a manner so as to increase the aperture ratio of the matrix display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.