Touch position detection method, touch panel controller, and electronic device
AssigneeSharp Kabushiki Kaisha
InventorsMUTSUMI HAMAGUCHI, MASAYUKI MIYAMOTO, SHINJI SHINJO
Life of this patent
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Abstract
Capacitance distribution is detected on a touch panel with a simple configuration. Drive sense lines (DS0 to DS(M−1)) are driven at a first potential on the basis of a code sequence. Subsequently, each of drive sense switch elements (DST22 and DST22′) corresponding to a hand-touching region (22) is made to turn off, and a linear sum signal based on an electric charge of each of detection electrodes (E) is read.
Claims8
A touch position detection method for detecting a touch position on a touch panel based on a capacitance between each of a plurality of electrodes arranged in matrix on the touch panel and a detected subject, the touch position detection method comprising:
- a first detection step of detecting a hand-touching region being a region in which a hand is placed for input to the touch panel and input is unintentional;
- a first drive step of turning on a switch element selected among a plurality of switch elements between the plurality of electrodes and a plurality of signal lines aligned in a first direction of the matrix based on a code sequence via a plurality of control lines aligned in a second direction intersecting the first direction and driving the plurality of signal lines at a first potential;
- and
- a second detection step of, after the first drive step, turning off a switch element corresponding to the hand-touching region detected in the first detection step among the plurality of switch elements and also turning on a switch element except for the switch element corresponding to the hand-touching region, reading a linear sum signal based on an electric charge of each of the plurality of electrodes along each of the plurality of signal lines, and detecting a touch position in which input to the touch panel is intentional.
A touch panel controller configured to control a touch panel configured to detect a touch position based on a capacitance between each of a plurality of electrodes arranged in matrix and a detected subject, the touch panel controller comprising:
- a detection circuit configured to detect a hand-touching region being a region in which a hand is placed for input to the touch panel and input is unintentional;
- and
- a drive circuit configured to turn on a switch element selected among a plurality of switch elements between the plurality of electrodes and a plurality of signal lines aligned in a first direction of the matrix based on a code sequence via a plurality of control lines aligned in a second direction intersecting the first direction and drive the plurality of signal lines at a first potential,
- wherein the detection circuit reads a linear sum signal based on an electric charge of each of the plurality of electrodes along each of the plurality of signal lines while a switch element corresponding to the hand-touching region detected by the detection circuit among the plurality of switch elements is made to turn off and a switch element except for the switch element corresponding to the hand-touching region is also made to turn on, and detects a touch position in which input to the touch panel is intentional.
Dependencies are inferred from the claim text.