Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-08-01
1998-10-20
Tung, Kee M.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345173, 345174, G09G 336
Patent
active
058253459
ABSTRACT:
During a display period (Y-coordinate detection period), an image is written to an electro-optical material so as to form a display by driving row electrodes and column electrodes by using a row-electrode driving circuit and a column-electrode driving circuit so as to selectively operate TFTs. In this case, a shift data signal having a width corresponding to two clocks of a horizontal sync signal is supplied to the row-electrode driving circuit by using a start-pulse-width expanding circuit; therefore, two row-electrode scanning signals are simultaneously inputted to two of the corresponding row electrodes. Moreover, the row-electrode scanning signals have periods in which they instantaneously turn "off" respectively, and the turning-off timing is coincident in the respective signals. Since a Y-coordinate detection signal is detected in this manner, it becomes possible to increase an induced voltage to be exerted in a detection electrode of an electronic pen, to improve the S/N ratio of the Y-coordinate detection signal, and also to enhance the detection accuracy of the Y-coordinate.
REFERENCES:
patent: 5357266 (1994-10-01), Tagawa
patent: 5448024 (1995-09-01), Kawaguchi et al.
patent: 5534892 (1996-07-01), Tagawa
(No copy has been received). "TFT LCD Panel".
Nozaki Kiyohiro
Tagawa Takao
Takahama Kengo
Luu Matthew
Sharp Kabushiki Kaisha
Tung Kee M.
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