TOUCH PANEL CONTROLLER AND ELECTRONIC APPARATUS EMPLOYING SAME
First Claim
1. A touch panel controller, comprising:
- a driving section for driving M drive lines on the basis of a code sequence having a length of N (N≧
M) so as to drive (i) a plurality of first electrostatic capacitors provided between the respective M drive lines and a first sense line and (ii) a plurality of second electrostatic capacitors provided between the respective M drive lines and a second sense line that is adjacent to the first sense line so that (i) a first linear sum of first capacitance values of the respective plurality of first electrostatic capacitors is outputted from the first sense line and (ii) a second linear sum of second capacitance values of the respective plurality of second electrostatic capacitors is outputted from the second sense line;
a differential amplifier for amplifying a difference between the first linear sum and the second linear sum; and
correction means for correcting a line dependency between the first capacitance values and the second capacitance values.
2 Assignments
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Accused Products
Abstract
A touch panel controller (1), which can accurately detect changes in capacitance values of respective first and second electrostatic capacitors which are touched, includes: a driving section (4) for driving drive lines (DL1 through DL4) on the basis of a code sequence so as to drive (i) electrostatic capacitors (C31 through C34) provided between the respective drive lines (DL1 through DL4) and a sense line (SL3) and (ii) electrostatic capacitors (C41 through C44) provided between the respective drive lines (DL1 through DL4) and a sense line (SL4) so that (i) a first linear sum of first capacitance values of the respective electrostatic capacitors (C31 through C34) is outputted from the sense line (SL3) and (ii) a second linear sum of second capacitance values of the respective electrostatic capacitors (C41 through C44) is outputted from the sense line (SL4); a differential amplifier (5) for amplifying a difference between the first linear sum and the second linear sum; and a saturation prevention control section (8) for correcting a line dependency between the first capacitance values and the second capacitance values.
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Citations
18 Claims
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1. A touch panel controller, comprising:
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a driving section for driving M drive lines on the basis of a code sequence having a length of N (N≧
M) so as to drive (i) a plurality of first electrostatic capacitors provided between the respective M drive lines and a first sense line and (ii) a plurality of second electrostatic capacitors provided between the respective M drive lines and a second sense line that is adjacent to the first sense line so that (i) a first linear sum of first capacitance values of the respective plurality of first electrostatic capacitors is outputted from the first sense line and (ii) a second linear sum of second capacitance values of the respective plurality of second electrostatic capacitors is outputted from the second sense line;a differential amplifier for amplifying a difference between the first linear sum and the second linear sum; and correction means for correcting a line dependency between the first capacitance values and the second capacitance values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification