TOUCH PANEL CONTROLLER, TOUCH PANEL SYSTEM AND ELECTRONIC EQUIPMENT
First Claim
1. A touch panel controller for detecting a touched position on a screen by estimating or detecting a capacitance value after driving a plurality of drive lines of a touch sensor panel and amplifying the capacitance value of electrostatic capacitance between sense lines and the drive lines with an amplifier, comprising, between an input end of the amplifier and sense line,at least two switching means connected in series, anda predetermined voltage applying means for applying a predetermined voltage to a node between the two switching means when the two switching means are in an off state.
1 Assignment
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Accused Products
Abstract
An effect of an error factor due to a leakage current via an off resistance when a switch is disposed on the input side of an amplifier is reduced to enable correct detection of a change in capacitance of electrostatic capacitance more accurately.
In a touch panel controller 20 for detecting a touched position on a screen by detecting a capacitance value after amplifying the capacitance value of electrostatic capacitance C between the drive lines and sense lines with an amplifier 3, the. touch panel controller 20 has at least two switching means SWA and SWB connected in series and a predetermined voltage applying section Vcom for outputting a predetermined voltage to a node between the two switching means SWA and SWB through a switching means SWC when the two switching means SWA and SWB are in an off state between an input end of the amplifier 3 and the sense line SL.
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Citations
13 Claims
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1. A touch panel controller for detecting a touched position on a screen by estimating or detecting a capacitance value after driving a plurality of drive lines of a touch sensor panel and amplifying the capacitance value of electrostatic capacitance between sense lines and the drive lines with an amplifier, comprising, between an input end of the amplifier and sense line,
at least two switching means connected in series, and a predetermined voltage applying means for applying a predetermined voltage to a node between the two switching means when the two switching means are in an off state.
Specification