Computer graphics processing and selective visual display system – Display driving control circuitry
Patent
1994-01-26
1999-04-06
Lao, Lun-Yi
Computer graphics processing and selective visual display system
Display driving control circuitry
345210, 345 95, 345 91, 345 92, G09G 336
Patent
active
058925040
ABSTRACT:
A matrix display device comprising a row and column array of display elements (14), e.g. LC display elements, each of which is connected in series with a two terminal non-linear device (15), such as a MIM, between associated row and column address conductors (16,17) and drive means (20,22,25) for applying drive voltages to the picture elements comprising a scanning signal circuit (20) and a data signal circuit (22) for applying selection signals and data signals respectively to the sets of address conductors, in which a sensing circuit (40) provides a control signal (V.sub.1) indicative of current flowing in one, or more, address conductor (16) of one set during the application of selection signals to that conductor which determines the drive voltages applied to the picture elements, preferably by adjustment of the selection signal level, so as to compensate for changes over time in the threshold characteristics of the non-linear devices. Four or five level scanning signal drive schemes may be used. Such compensation may be effected periodically or continually in operation of the display device.
REFERENCES:
patent: 4443741 (1984-04-01), Tanaka et al.
patent: 4586039 (1986-04-01), Nonomura et al.
patent: 5172104 (1992-12-01), Tanigaki et al.
patent: 5220315 (1993-06-01), Clerc
patent: 5229761 (1993-07-01), Fuse
Kraus Robert J.
Lao Lun-Yi
U.S. Philips Corporation
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