Touch sensor, display and electronic unit
First Claim
Patent Images
1. A display comprising:
- a plurality of display pixel electrodes;
a plurality of common electrodes arranged to face the display pixel electrodes;
a display layer;
a display control circuit performing image display control based on an image signal so as to activate the display layer by applying a voltage for display between the display pixel electrodes and the common electrodes;
a plurality of touch detection electrodes facing the common electrodes or each arranged side by side with each of the common electrodes to form a capacitance between each of the touch detection electrodes and each of the common electrodes; and
a touch detection circuit detecting an external proximity object based on a detection signal obtained from the touch detection electrodes with use of a common drive voltage for display applied to the common electrodes by the display control circuit as a touch sensor drive signal,wherein the touch detection circuit includes;
a first filter allowing a fundamental detection signal, contained in the detection signal and having a frequency same as a fundamental frequency of the touch sensor drive signal, to pass therethrough,a plurality of second filters separately allowing two or more harmonic detection signals, contained in the detection signal and having frequencies same as respective harmonic frequencies of the touch sensor drive signal, to pass therethrough, anda detection section performing a detection operation based on the fundamental detection signal and the plurality of harmonic detection signals.
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Abstract
A display includes: display pixel electrodes; common electrodes; a display layer; a display control circuit; touch detection electrodes; and a touch detection circuit detecting an external proximity object based on a detection signal obtained from the touch detection electrodes with use of a common drive voltage for display applied to the common electrode as a touch sensor drive signal. The touch detection circuit includes: a first filter allowing a fundamental detection signal, contained in the detection signal and having a frequency same as a fundamental frequency of the touch sensor drive signal, to pass therethrough, a plurality of second filters separately allowing two or more harmonic detection signals, contained in the detection signal and having frequencies same as respective harmonic frequencies of the touch sensor drive signal, to pass therethrough, and a detection section performing a detection operation based on the fundamental detection signal and the harmonic detection signals.
12 Citations
13 Claims
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1. A display comprising:
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a plurality of display pixel electrodes; a plurality of common electrodes arranged to face the display pixel electrodes; a display layer; a display control circuit performing image display control based on an image signal so as to activate the display layer by applying a voltage for display between the display pixel electrodes and the common electrodes; a plurality of touch detection electrodes facing the common electrodes or each arranged side by side with each of the common electrodes to form a capacitance between each of the touch detection electrodes and each of the common electrodes; and a touch detection circuit detecting an external proximity object based on a detection signal obtained from the touch detection electrodes with use of a common drive voltage for display applied to the common electrodes by the display control circuit as a touch sensor drive signal, wherein the touch detection circuit includes; a first filter allowing a fundamental detection signal, contained in the detection signal and having a frequency same as a fundamental frequency of the touch sensor drive signal, to pass therethrough, a plurality of second filters separately allowing two or more harmonic detection signals, contained in the detection signal and having frequencies same as respective harmonic frequencies of the touch sensor drive signal, to pass therethrough, and a detection section performing a detection operation based on the fundamental detection signal and the plurality of harmonic detection signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A touch sensor comprising:
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a plurality of touch drive electrodes; a plurality of touch detection electrodes facing the touch drive electrodes or each arranged side by side with each of the touch drive electrodes to form a capacitance between each of the touch detection electrodes and each of the touch drive electrodes; and a touch detection circuit detecting an external proximity object based on a detection signal obtained from the touch detection electrodes by applying a touch sensor drive signal to the touch drive electrodes, wherein the touch detection circuit includes; a first filter allowing a fundamental detection signal, contained in the detection signal and having a frequency same as a fundamental frequency of the touch sensor drive signal, to pass therethrough, a plurality of second filters separately allowing two or more harmonic detection signals, contained in the detection signal and having frequencies same as respective harmonic frequencies of the touch sensor drive signal, to pass therethrough, and a detection section performing a detection operation based on the fundamental detection signal and the plurality of harmonic detection signals.
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13. An electronic unit having a display with a touch sensor, the display comprising:
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a plurality of display pixel electrodes; a plurality of common electrodes arranged to face the display pixel electrodes; a display layer; a display control circuit performing image display control based on an image signal so as to activate the display layer by applying a voltage for display between the display pixel electrodes and the common electrodes; a plurality of touch detection electrodes facing the common electrodes or each arranged side by side with each of the common electrodes to form a capacitance between each of the touch detection electrodes and each of the common electrodes; and a touch detection circuit detecting an external proximity object based on a detection signal obtained from the touch detection electrodes with use of a common drive voltage for display applied to the common electrodes by the display control circuit as a touch sensor drive signal, wherein the touch detection circuit includes; a first filter allowing a fundamental detection signal, contained in the detection signal and having a frequency same as a fundamental frequency of the touch sensor drive signal, to pass therethrough, a plurality of second filters separately allowing two or more harmonic detection signals, contained in the detection signal and having frequencies same as respective harmonic frequencies of the touch sensor drive signal, to pass therethrough, and a detection section performing a detection operation based on the fundamental detection signal and the plurality of harmonic detection signals.
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Specification
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Current AssigneeJapan Display West Incorporated (Japan Display Incorporated)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsHarada, Tsutomu, Noguchi, Kouji, Kida, Yoshitoshi, Ishizaki, Koji, Takeuchi, Takeya, Nakanishi, Takayuki
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Primary Examiner(s)Nguyen, Kevin M
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Application NumberUS12/793,464Publication NumberTime in Patent Office929 DaysField of Search345173-183US Class Current345/174CPC Class CodesG02F 1/13338 Input devices, e.g. touch p...G06F 3/0445 using two or more layers of...G06F 3/0446 using a grid-like structure...
