Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1993-05-21
1995-04-25
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345174, G09G 336
Patent
active
054103290
ABSTRACT:
A detection and hold circuit outputs a reference signal having a level proportional to an x-coordinate detection pulse input from an X-coordinate signal amplifier. A delay element delays the reference signal. An adder adds the x-coordinate detection pulse from the X-coordinate signal amplifier and a delayed signal from the delay element. Comparators obtain a coordinate detection pulse making a detection signal from another detection and hold circuit for an LCD voltage inversion pulse serve as a reference signal. Thus noise following the x-coordinate detection pulse is removed to generate a coordinate detection pulse with a reference value corresponding to the level of the LCD voltage inversion pulse to allow a stable coordinate detection to be achieved. A correction signal generation circuit reads out correction data stored in an internal memory and transmits the data as a correction signal to a correction voltage generation circuit in an x-coordinate detection period when the segment electrode placed in the lower position is scanned. The correction voltage generation circuit generates a correction voltage for canceling a voltage induced at the common electrode placed in the upper position based on the input correction signal and a bias power source input from a DC power supply circuit.
REFERENCES:
patent: 4709209 (1987-11-01), Murakami et al.
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patent: 4818851 (1989-04-01), Kimura
patent: 4839634 (1989-06-01), More et al.
patent: 4841290 (1989-06-01), Nakano et al.
patent: 5119404 (1992-06-01), Aihara
patent: 5214319 (1993-05-01), Abdi
patent: 5227732 (1993-07-01), Hong
Kako Noritoshi
Okamura Kazunari
Tagawa Takao
Takahama Kengo
Chang Vivian
Conlin David G.
Fournier Kevin J.
Oberley Alvin E.
Sharp Kabushiki Kaisha
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