Active matrix display having pixel driving circuits with integrated charge pumps
US5903248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1997 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Apr 11, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0871
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel driving circuit (400) receives a signal voltage VA from a column bus (403) and generates therefrom, a back plate electrode voltage VB which is approximately twice that of a signal voltage VA. Included in the pixel driving circuit (400) are three transistors (402, 407 and 408) and a storage capacitor (404). During a first time period, two of the three transistors turn on to charge up or discharge the storage capacitor to the signal voltage VA, while the third transistor (407) is turned off, and during a second time, the third transistor (407) is turned on to effectively double the voltage provided to the back plate electrode, while the other two of the three transistors are turned off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.