Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-12-21
1997-10-21
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, G09G 336
Patent
active
056801491
ABSTRACT:
In a driving circuit for driving an active matrix type liquid crystal display device, the analog buffer includes a differential circuit constructed by P-channel thin film transistors (TFTs) and a current mirror circuit constructed by N-channel TFTs. When a voltage on a first input terminal of the differential circuit which is connected with a storage capacitor increases, an input current in the current mirror circuit connected with a reverse phase output terminal to the first input terminal decreases and an output current of the current mirror circuit decreases in response to decrease of the input current of the current mirror circuit. On the other hand, since a current through a common phase output terminal to the first input terminal increases, a voltage on the signal line increases and reaches a voltage on the first input terminal of the differential circuit.
REFERENCES:
patent: 5376926 (1994-12-01), Sano
patent: 5455534 (1995-10-01), Motegi et al.
Koyama Jun
Nakanishi Naomi
Ferguson Jr. Gerald J.
Hjerpe Richard
Liang Regina
Robinson Eric J.
Semiconductor Energy Laboratory Co,. Ltd.
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