CAPACITANCE CHANGE DETECTION CIRCUIT, TOUCH PANEL AND DETERMINATION METHOD
2 Assignments
0 Petitions
Accused Products
Abstract
A detection circuit 1 includes: an input unit 2; two contact electrodes A and B which are connected to the input unit; phase invention means 3 connected to the contact electrode A; one amplification means 41 arranged in each contact means; and detection means 5A and 5B which detect as an electric change amount, an amplitude change of an input signal caused by a capacitance change in each of the contact electrodes A and B. The detection circuit 1 causes the two electrodes to input signals having phases shifted by a half period from each other by using the phase invention means 3. In the presence of contact, the amplitude of the input pulses is amplified by the one amplification means 41. The respective detection means 5A and 5B detect signals of respective electrodes from the one amplified signal and output them to output units 6A and 6B, respectively.
-
Citations
20 Claims
-
1-10. -10. (canceled)
-
11. A capacitance change detection circuit, comprising:
-
at least one set of contact electrodes including a set of a first contact electrode supplied with a pulse signal from an input unit for the pulse signal via phase inversion means, and a second contact electrode supplied with the pulse signal from the input unit; one amplification means connected to the one set of contact electrodes; first detection means for detecting a signal showing a state of the first contact electrode; second detection means for detecting a signal showing a state of the second contact electrode; and output units connected to the first detection means and the second detection means, respectively. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification