Cell circuit for active matrix liquid crystal displays using hig

Details Cell circuit for active matrix liquid crystal displays using hig Cell circuit for active matrix liquid crystal displays using hig

1998-02-27

2000-08-22

Liang, Regina

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345205, G09G 384

Patent

active

061079804

ABSTRACT:
An active matrix circuit for compact, high resolution reflective liquid ctal displays includes a low quiescent current, low output impedance MOS transistor amplifier produced in a CMOS process. A voltage controlled input switch effects the voltage refresh of the active matrix cell by passing a data voltage to the input of the transistor amplifier when a control voltage pulse is present on the input switch control line. All active matrix cells in a given row use the same input switch control line, and all active matrix cells in a given column access the same data input line. Refresh of the active matrix cell voltage terminates when the input switch is opened, storing the data voltage on the input node capacitance of the amplifier. The active matrix circuit is particularly addressed to liquid crystal devices having fast, analog response liquid crystals with large molecular polarizations such as in the Electroclinic Liquid Crystals (ELC). Including such an amplifier in each active matrix cell facilitates delivery of the large charge required to switch such liquid crystals without incurring a concomitant drop in pixel voltage, as encountered with other active matrix cell circuits.

REFERENCES:
patent: 3564135 (1971-02-01), Weimer
patent: 3949242 (1976-04-01), Hirasawa et al.
patent: 4429305 (1984-01-01), Hosokowa et al.
patent: 5218464 (1993-06-01), Hiroki et al.
patent: 5339090 (1994-08-01), Crossland
patent: 5448258 (1995-09-01), Edwards
patent: 5627557 (1997-05-01), Yamaguchi et al.

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