Invention Grant
- Patent Title: Method of driving touch panel, capacitance-type touch panel, and display apparatus with touch detection function
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Application No.: US14702279Application Date: 2015-05-01
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Publication No.: US09606667B2Publication Date: 2017-03-28
- Inventor: Kouji Noguchi , Tsutomu Harada , Yoshitoshi Kida , Takayuki Nakanishi , Koji Ishizaki , Takeya Takeuchi
- Applicant: JAPAN DISPLAY, INC.
- Applicant Address: JP Tokyo
- Assignee: Japan Display Inc.
- Current Assignee: Japan Display Inc.
- Current Assignee Address: JP Tokyo
- Agency: Chicago Technology Law LLC
- Agent Robert Depke
- Priority: JP2009-154207 20090629
- Main IPC: G06F3/044
- IPC: G06F3/044 ; G06F3/041 ; G09G3/36 ; G02F1/1333

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.
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