Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1991-03-08
1993-10-05
Brier, Jeffery
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 94, 345101, G09G 336
Patent
active
052509370
ABSTRACT:
A half tone liquid crystal display circuit is disclosed including a voltage divider using as a reference voltage a voltage which is approximately determined on the basis of a point of intersection of the extensions of straight lines along the gradients of brightness-voltage characteristics corresponding to at least two observation angles vertically different with respect to a liquid crystal display panel having a TFT active matrix structure to generate driving voltages for the half tone displays associated with a voltage varied to correspond to the observation angles; and a correcting voltage waveform generator for generating a dynamic observation angle correcting voltage varied in association with a vertical scanning operation corresponding to the difference in the vertical observation angles of a liquid crystal display frame. The half tone driving voltages generated by the voltage divider from the dynamic observation angle correcting voltage are subjected to level modulations.
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Kikuo Ono
Konishi Nobutake
Ohwada Jun-ichi
Takahashi Kohji
Tanaka Takeshi
Brier Jeffery
Hitachi , Ltd.
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