Title:
POSITION DETECTING CIRCUIT FOR TOUCH PANEL
Document Type and Number:
Japanese Patent JP2002278690
Kind Code:
A
Abstract:
To dispense with any electronic switch control port, to simplify timing control, and to simultaneously recognize X and Y coordinates.
This position detecting circuit of a touch panel 1 to be touched with a touch point is provided with a bias impressing/current detecting circuit 2 using an operating amplifier for recognizing the X and Y coordinates of the touch point by detecting respective currents I3, I4, I1 and I2 running through respective electrodes X1, X2, Y1 and Y2 in the X and Y directions of the touch panel.
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Inventors:
SAKAGUCHI SHIGEKI
Application Number:
JP2001078646A
Publication Date:
September 27, 2002
Filing Date:
March 19, 2001
Export Citation:
Assignee:
AIPHONE CO LTD
International Classes:
G06F3/045; G06F3/03; G06F3/041; H03K17/96; (IPC1-7): G06F3/03; G06F3/033; H03K17/96
Domestic Patent References:
| JPH0380320A | 1991-04-05 | |||
| JPH06187084A | 1994-07-08 | |||
| JPH09160709A | 1997-06-20 | |||
| JPS6336425A | 1988-02-17 | |||
| JPS57127279A | 1982-08-07 |
Attorney, Agent or Firm:
Moriya Kazuo