Frame buffer pixel circuit for liquid crystal display
US6911964B2 · kind B2 · utility
229Cited by
12References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2002 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Nov 7, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0223
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An enhanced frame buffer pixel circuit with two control transistors and a separate capacitor put in as a memory capacitor before the memory transistor yields a high contrast ratio by removing induced charge and solving a charge sharing problem between the memory capacitor and the liquid crystal display (LCD) capacitor. The memory transistor may be made of either CMOS or PMOS. The frame buffer pixel can be used to drive binary displays which expresses ON and OFF only if a comparator is put in after the pixel electrode circuit to represent gray levels with reduced sub-frame frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.