Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-11-21
1998-09-22
Saras, Steven J.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 91, G09G 336
Patent
active
058121064
ABSTRACT:
An active matrix display device, having an array of picture elements (12) comprising electro-optic, for example LC, display elements (14) and associated switching devices (15), for example thin film diodes, driven by selection and data signals applied to sets of row and column address conductors (16, 17) respectively, which includes a reference circuit (34) comprising a switching device (35) connected to a capacitive element (36) and similarly driven periodically by selection signals and a reference data signal applied via one of the column address conductors (17), and an adjustment circuit which senses the voltage at the capacitive element (36), indicative of the operational behavior of the switching device (35), at particular times corresponding substantially to the termination of a selection signal applied to the reference circuit and which, according to the sensed voltage at that time, is operable to adjust the drive voltages used for the picture elements (12) so as to compensate for changes in the operational behavior of the switching device.
REFERENCES:
patent: 5159325 (1992-10-01), Kuijk et al.
patent: 5428370 (1995-06-01), Knapp et al.
patent: 5434599 (1995-07-01), Hirai et al.
patent: 5459483 (1995-10-01), Edwards
Faller F. Brice
Saras Steven J.
U.S. Philips Corporation
Wu Xu-Ming
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