Active matrix display devices for digital video signals and meth

Details Active matrix display devices for digital video signals and meth Active matrix display devices for digital video signals and meth

1993-07-21

1998-12-22

Mengistu, Amare

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 99, G09G 306

Patent

active

058524258

ABSTRACT:
A TFT active matrix display device comprising an array of display elements (12), e.g. LC display elements, each connected to the drain of a TFT (17) whose gate and source are connected respectively to a row conductor (18) to which selection signals are applied by a scan drive circuit (21) and a column conductor (19) to which display data signals are applied by a data signal drive circuit (25) in the form of time dependent signals comprising pulse width modulated signals derived from an input digital video signal and representing video sample values. During the selection period the TFTs are biased to act as current sources such that their associated display elements (12) are charged to a level dependent on the duration of the applied signals. The digital to analogue conversion of the video signal is thus completed at the picture elements. In an initial part of the selection period a reference potential, which alternates between two levels in successive fields, is applied to the column conductors to reset the display elements to a predetermined level.

REFERENCES:
patent: 4750813 (1988-06-01), Ohwada et al.
patent: 4881066 (1989-11-01), Kanno et al.
patent: 5051739 (1991-09-01), Hayashida et al.
patent: 5095304 (1992-03-01), Young

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