Circuit of controlling common voltage of liquid crystal panel
US11580928B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 2022 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Jun 23, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/0435
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure relates to a circuit of controlling a common voltage of a liquid crystal panel. According to an embodiment of the present disclosure, a voltage control circuit is configured to provide a common voltage to a common electrode of a liquid crystal panel. The liquid crystal panel includes M rows and N columns of pixel units. Each pixel unit is coupled to the common electrode. The voltage control circuit includes an operational amplifier arranged in a negative feedback configuration. The operational amplifier includes: an input stage, a gain stage and an output stage. The output stage includes a second NMOS transistor and a second PMOS transistor. A gate of the second NMOS transistor receives a first control signal, a drain of the second NMOS transistor is coupled to a gate of a first PMOS transistor, and a source of the second NMOS transistor is coupled to a second reference voltage. A gate of the second PMOS transistor receives a second control signal, a drain of the second PMOS transistor is coupled to a gate of a first NMOS transistor, and a source of the second PMOS transistor is coupled to a third reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.