METHOD OF DRIVING TOUCH PANEL, CAPACITANCE-TYPE TOUCH PANEL, AND DISPLAY APPARATUS WITH TOUCH DETECTION FUNCTION
First Claim
1. A capacitance-type touch panel comprising:
- a plurality of drive electrodes each having a strip shape;
a drive control circuit performing control such that a drive signal for touch detection is selectively applied to the drive electrodes;
a plurality of touch detection electrodes arranged to intersect with the drive electrodes in such a manner that capacitance is formed in each intersecting part, and each outputting a detection signal in synchronization with the drive signal; and
a detection circuit detecting an external proximity object based on the detection signal,wherein the drive control circuit controls application of the drive signal in such a manner that the detection signal comes to be a polarity-alternating signal including a positive-negative asymmetrical signal component which is due to presence of the external proximity object.
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Accused Products
Abstract
A capacitance-type touch panel, allowing disturbance noise and touch detection time to be reduced and having a simple configuration, is provided. The capacitance-type touch panel including: a plurality of drive electrodes each having a strip shape; a drive control circuit performing control such that a drive signal for touch detection is selectively applied to the drive electrodes; a plurality of touch detection electrodes arranged to intersect with the drive electrodes in such a manner that capacitance is formed in each intersecting part, and each outputting a detection signal in synchronization with the drive signal; and a detection circuit detecting an external proximity object based on the detection signal. The drive control circuit controls application of the drive signal in such a manner that the detection signal is a polarity-alternating signal including a positive-negative asymmetrical signal component which is due to presence of the external proximity object.
83 Citations
14 Claims
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1. A capacitance-type touch panel comprising:
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a plurality of drive electrodes each having a strip shape; a drive control circuit performing control such that a drive signal for touch detection is selectively applied to the drive electrodes; a plurality of touch detection electrodes arranged to intersect with the drive electrodes in such a manner that capacitance is formed in each intersecting part, and each outputting a detection signal in synchronization with the drive signal; and a detection circuit detecting an external proximity object based on the detection signal, wherein the drive control circuit controls application of the drive signal in such a manner that the detection signal comes to be a polarity-alternating signal including a positive-negative asymmetrical signal component which is due to presence of the external proximity object. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display apparatus with a touch detection function comprising:
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a plurality of drive electrodes each having a strip shape; a drive control circuit performing control such that a drive signal for touch detection is selectively applied to the drive electrodes; a plurality of touch detection electrodes arranged to intersect with the drive electrodes in such a manner that capacitance is formed in each intersecting part, and each outputting a detection signal in synchronization with the drive signal; a detection circuit detecting an external proximity object based on the detection signal; and a display section displaying an image based on an image signal, wherein the drive control circuit controls application of the drive signal in such a manner that the detection signal comes to be a polarity-alternating signal including a positive-negative asymmetrical signal component which is due to presence of the external proximity object. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of driving a touch panel, comprising steps of:
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selectively applying a drive signal for touch detection to a plurality of drive electrodes each having a strip shape; allowing each of a plurality of touch detection electrodes to output a detection signal in synchronization with the drive signal when a external proximity object exists, the touch detection electrodes being arranged to intersect with the drive electrodes in such a manner that capacitance is formed in each intersecting part, and the detection signal being a polarity-alternating signal including a positive-negative asymmetrical signal component which is due to presence of a external proximity object; and detecting the external proximity object based on the detection signal.
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Specification