Display-integrated type tablet device with high coordinate detec

Details Display-integrated type tablet device with high coordinate detec Display-integrated type tablet device with high coordinate detec

1994-04-29

1995-09-05

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

178 19, 345156, 345179, 345182, G08C 2100, G09G 302

Patent

active

054480248

ABSTRACT:
A switching circuit selects a display control circuit in an image display period, and selects a detection control circuit in an x-coordinate detection period. A row electrode drive circuit outputs row electrode scanning pulses in the image display period to sequentially scan row electrodes. A column electrode drive circuit outputs column electrode scanning pulses in the x-coordinate detection period to sequentially scan column electrodes. A coordinate detection circuit detects coordinates at a tip end of a detection pen based on an induction voltage induced at a tip electrode of the detection pen due to the scanning pulses. Accordingly, by detecting a y-coordinate at the tip end of the electronic pen in the image display period and detecting the x-coordinate in the x-coordinate detection period, a display-integrated type tablet device can achieve an increase in area of its display screen, high productivity, cost reduction, and high coordinate detection accuracy.

REFERENCES:
patent: 4617515 (1986-10-01), Taguchi
patent: 4646073 (1987-02-01), Fukunaga
patent: 4839634 (1989-06-01), More et al.
patent: 4988837 (1991-01-01), Murakami
patent: 4989040 (1991-01-01), Matsuo
patent: 4992630 (1991-02-01), Mletzko
patent: 5194852 (1993-03-01), More et al.
patent: 5266750 (1993-11-01), Yatsuzuka
patent: 5270711 (1993-12-01), Knapp
Patent Abstract of Japan, vol. 16, No. 525 (P-1446), Oct. 28, 1992.

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