Push amount detecting sensor and touch input device
First Claim
1. A push detecting sensor comprising:
- a touch panel that includes a piezoelectric sensor that outputs a push signal corresponding to a displacement amount when a surface of the touch panel is pushed;
a touch detecting sensor that outputs a touch detection signal when the surface of the touch panel is touched;
a push amount calculating circuit that integrates a difference between the push signal and a reference potential to generate a push amount detection signal; and
a switching element that controls the push amount calculating unit, based on a state of the touch detection signal, to switch the push amount calculating circuit between integrating the difference between the push signal and the reference potential and resetting the reference potential,wherein the switching element controls the push amount calculating circuit to integrate the difference between the push signal and the reference potential when the state of the touch detection signal indicates an operation state in which the touch panel is being touched, andwherein the switching element controls the push amount calculating circuit to reset the reference potential when the state of the touch detection signal switches to an untouched state of the touch panel to stabilize the reference potential.
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Abstract
A touch input device includes a touch panel, a push amount calculating unit and a touch detection signal generating unit. The touch panel includes piezoelectric and electrostatic sensors. The piezoelectric sensor outputs to the push amount calculating unit a push signal corresponding to a displacement amount obtained by pushing an operation surface. The electrostatic sensor outputs touch signals, corresponding to a touch and a non-touch, to a touch detection signal generating unit. The touch detection signal generating unit outputs to the push amount calculating unit the touch detection signals binarized according to the touch and non-touch state. The push amount calculating unit integrates differences between push signals and a reference potential during a touch state, generates a push amount detection signal and outputs the push amount detection signal. This unit resets a reference potential during a period in which a touch detection signal indicating a non-touch state is inputted.
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Citations
19 Claims
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1. A push detecting sensor comprising:
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a touch panel that includes a piezoelectric sensor that outputs a push signal corresponding to a displacement amount when a surface of the touch panel is pushed; a touch detecting sensor that outputs a touch detection signal when the surface of the touch panel is touched; a push amount calculating circuit that integrates a difference between the push signal and a reference potential to generate a push amount detection signal; and a switching element that controls the push amount calculating unit, based on a state of the touch detection signal, to switch the push amount calculating circuit between integrating the difference between the push signal and the reference potential and resetting the reference potential, wherein the switching element controls the push amount calculating circuit to integrate the difference between the push signal and the reference potential when the state of the touch detection signal indicates an operation state in which the touch panel is being touched, and wherein the switching element controls the push amount calculating circuit to reset the reference potential when the state of the touch detection signal switches to an untouched state of the touch panel to stabilize the reference potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A touch input device comprising:
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a push detecting sensor that includes; a touch panel that includes a piezoelectric sensor that outputs a push signal corresponding to a displacement amount when a surface of the touch panel is pushed; a touch detecting sensor that outputs a touch detection signal when the surface of the touch panel is touched; a push amount calculating circuit that is coupled to the touch detecting sensor and receives the touch detection signal; and a switching element that controls the push amount calculating unit, based on a state of the touch detection signal, to switch between integrating a difference between the push signal and a reference potential to generate a push amount detection signal and resetting the reference potential, wherein the switching element controls the push amount calculating circuit to integrate the difference between the push signal and the reference potential when the state of the touch detection signal indicates an operation state in which the touch panel is being touched, and wherein the switching element controls the push amount calculating circuit to reset the reference potential when the state of the touch detection signal switches to an untouched state of the touch panel to stabilize the reference potential, wherein the touch input device is configured to output the touch detection signal together with the push amount detection signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification