Display-integrated tablet device providing coordinate detection

Details Display-integrated tablet device providing coordinate detection Display-integrated tablet device providing coordinate detection

1994-08-31

1996-09-03

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

178 18, 178 20, 345156, 345157, 345174, 345179, 345182, 345183, G08C 2100, G09G 302

Patent

active

055525687

ABSTRACT:
A display-integrated tablet device is disclosed and is capable of increasing an actual display period to improve luminance of an image displayed. An actual image display period in a one-image-plane display period is divided into a plurality of block display periods and a detection period is provided before or after each of the block display periods. During the detection period, a pulse for detection is generated from a stylus pen and a voltage obtained at each of electrodes is input to each of X- and Y-coordinate detection sections and held in those sections for coordinate detection. The device includes scan-side switch sections for respectively connecting X- and Y-scan drivers to X- and Y-electrodes, and detection-side switch sections for respectively connecting X- and Y-coordinate detection sections to the X- and Y-electrodes, so that the scan-side switches sections and detection-side switch sections are turned on and turned off during an actual display period, and turned off and turned on during a detection mode period, respectively.

REFERENCES:
patent: 4740660 (1988-06-01), Kimura
patent: 4758690 (1988-07-01), Kimura
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patent: 4818826 (1989-04-01), Kimura
patent: 4841290 (1989-06-01), Nakano
patent: 4872000 (1989-10-01), Kano
patent: 4890096 (1989-12-01), Taguchi
patent: 4902858 (1990-02-01), Yamanami
patent: 4980518 (1990-12-01), Kobayashi
patent: 5070325 (1991-12-01), Tanaka

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