Input/output pixel circuit and array of such circuits
US5204661A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1990 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Dec 13, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A light sensing and display driving apparatus is operable independent of polling cycle providing a more accurate sensing of the patterns of illumination incident on an array of such apparatus, with a minimum of required interconnections per pixel. Each address line may simultaneously initialize one row of apparatus while enabling the subsequent row of apparatus. The apparatus is also compatible with elements capable of providing gain in the sensing mode, given that the photosensitive element is separate from the path across which voltage or current is measured. The display driving portion is compatible with standard active-matrix LCDs. The apparatus allows a minimum physical isolation between the sensing and display portions while maintaining sufficient electrical isolation to prevent the deleterious effects resulting from application of a display driving potential to sensing circuitry, and allows employing a timing scheme for both sensing and display driving within a short time period. The apparatus may be fabricated of amorphous silicon. The apparatus includes, inter alia, a conductive element interconnecting input and output terminals, a multiple-state sensing device whose state…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.