Analog video signal compensating apparatus and TFT liquid crysta

Details Analog video signal compensating apparatus and TFT liquid crysta Analog video signal compensating apparatus and TFT liquid crysta

1995-12-13

1998-04-14

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display driving control circuitry

345 98, 345101, 345212, G09G 500

Patent

active

057398160

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.

REFERENCES:
patent: 4789824 (1988-12-01), Henkelmann
patent: 5179345 (1993-01-01), Jenkins et al.
patent: 5414441 (1995-05-01), Memarzadeh et al.
patent: 5489910 (1996-02-01), Kuwata et al.
patent: 5561381 (1996-10-01), Jenkins et al.

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