Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-03-10
1997-11-04
Burgess, Glenton B.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 97, 345208, 359 54, G09G 334
Patent
active
056845014
ABSTRACT:
In an active matrix display device having an army of electro-optic, e.g. liquid crystal, display elements (12) which are each connected in series with a two-terminal non-linear device (15), such as a MIM type thin film diode, between associated row and column address conductors (16,17), and are driven by a circuit, (20,22) to produce a display effect by applying a selection signal to each row address conductor in turn and data signals to the column address conductors, a selection signal comprising a voltage pulse signal whose magnitude is increased gradually and in a controlled fashion to a maximum selection voltage amplitude is used so as to reduce the extent of ageing in the non-linear devices and differential ageing effects on display elements driven to different levels over a period of use by reducing peak currents flowing through the non-linear devices. The rising edge of the selection pulse signal is suitably shaped, for example by ramping or stepping, for this purpose. When using a five level row drive waveform comprising positive and negative selection signals and a reset signal, the reset selection signal can be shaped in this way, preferably together with the selection signal of opposite polarity.
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patent: 4710768 (1987-12-01), Takeda et al.
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Annis Alexander D.
Knapp Alan G.
Sandoe Jeremy N.
Shannon John M.
Burgess Glenton B.
Kraus Robert J.
U.S. Philips Corporation
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