Source driver and display device including the same
US11037479B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2020 |
| Grant date | Jun 15, 2021 |
| Priority date | — |
| Expiry date | Mar 6, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A source driver includes a gamma voltage generator to generate gamma voltages having mutually different voltage levels, a digital-to-analog converter to generate a data voltage corresponding to a grayscale value using the gamma voltages, an output buffer unit to output the data voltage, and a chopping controller to generate a chopping control signal, and to provide the chopping control signal to the output buffer unit. The output buffer unit includes an amplifier connected to an output terminal of the digital-to-analog converter, and a chopping circuit to periodically change a polarity of an offset of the amplifier in response to the chopping control signal. The chopping controller is to change a slew rate of the chopping control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.