Source driving circuit for improving gamma voltage response time and display device
US11455931B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2022 |
| Grant date | Sep 27, 2022 |
| Priority date | — |
| Expiry date | Mar 2, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A source driving circuit of a display includes a gamma resistor strings, a digital to analog (DAC) circuit, and an output buffer circuit. The output buffer circuit includes input stage module, gain stage module, and output stage module. The input stage module includes main input stage unit and auxiliary input stage unit. Sizes of elements in main input stage unit are larger than sizes of elements in the auxiliary input stage unit, smaller sizes presenting smaller parasitic capacitances. During the switching period, the auxiliary input stage unit, gain stage module, and output stage module form a first unity gain amplifier outputting the driving voltages. During the stable period, the main input stage unit, gain stage module, and output stage module form a second unity gain amplifier outputting the driving voltages. A display device is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.