Analog video signal compensating apparatus and TFT liquid crystal display device
US5739816A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1995 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Dec 13, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A driver for the TFT liquid crystal display panel is provided which can accommodate chip dispersion, and drift of temperature and supplied voltages. A reference voltage generated by a reference voltage generator is input by a control circuit to a display cell equivalent circuit driven by a buffer amplifier equivalent circuit and a control circuit, and its response is output from a TFT emulator circuit. Then, a difference detecting circuit compares the output and the reference voltage from the reference voltage generator, and outputs an output signal corresponding to its difference to a compensating circuit. The compensating circuit compensates analog video signals generated in the previous stage with such output. The compensated analog video signals are output to a TFT liquid crystal display panel through a sample hold circuit and a buffer amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.