Circuit and method for driving a capacitive load, and display device provided with a circuit for driving a capacitive load
US7330180B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 21, 2004 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | Apr 29, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal line driving circuit includes, for each output terminal TSj, a unit precharge circuit made of a capacitor Cpr and switches SWA1, SWA2, SWB1 and SWB2 for connecting the capacitor Cpr in parallel to a capacitive load of a liquid crystal panel. An OFF period in which first and second output buffers are electrically disconnected from the video signal line is provided between a P period in which a positive voltage is to be applied from the first output buffer in the video signal line driving circuit to the video signal lines (capacitive load) and an N period in which a negative voltage is to be applied from the second output buffer. A first and a second precharge period are set within this OFF period. In the first precharge period, the capacitor Cpr is connected in parallel to the capacitive load of the liquid crystal panel, and in the second precharge period, the capacitor Cpr is connected in parallel to the capacitive load with an orientation that is opposite to the orientation in the first precharge period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.