Display driver and display device
US11727838B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 2022 |
| Grant date | Aug 15, 2023 |
| Priority date | — |
| Expiry date | Jul 20, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display driver includes an amplifier circuit that outputs an output current based on a differential signal indicating a difference between a gradation voltage corresponding to a video signal and an output voltage to a source line of a display panel, thereby supplying the output voltage to the source line. An output current detection circuit generates a mirror current by copying the output current, and outputs an output current detection signal representing the mirror current. A failure determination circuit determines whether a failure is occurring or has occurred in the source line or not by comparing the level of the output current detection signal with a prescribed threshold value. The output current detection circuit includes a transistor that generates a mirror current by receiving the differential signal at a gate thereof, and a variable resistance that generates an output current detection signal upon receiving the generated mirror current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.