Negative step-up charge pump circuit, LCD driver IC, and liquid crystal display device
US8085257B2 · kind B2 · utility
1Cited by
13References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2007 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Dec 29, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/3677
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a negative step-up charge pump circuit according to the present invention, of a plurality of stages of charge transfer transistors and an output transistor, the former-stage transistors are P channel type field effect transistors, and the later-stage transistors are N channel type field effect transistors. With such configuration, it is possible to avoid start-up failure and current driving performance deterioration resulting from an increase in the number of stages of step-up units without complicating processes and increasing the chip size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.