Touch panel, method for detecting touch input position, electro-optic device, and electronic device
First Claim
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1. A touch panel comprising:
- a touch panel substrate having an input surface;
a cover film arranged separately from the input surface, and facing to the input surface;
spacers extending upright from the touch panel substrate toward the cover film;
a transmitter causing surface acoustic waves to be propagated on the input surface;
a receiver measuring the surface acoustic waves propagated on the input surface;
a memory storing, as reference values, measurement values of the surface acoustic waves when the cover film is not being pressed; and
a determination section detecting, as touch input positions, positions at which a difference between the measurement values of the surface acoustic waves when the touch panel is being used and the reference values is significant.
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Abstract
A touch panel includes: a touch panel substrate having an input surface; a cover film arranged separately from the input surface, and facing to the input surface; spacers extending upright from the touch panel substrate toward the cover film; a transmitter causing surface acoustic waves to be propagated on the input surface; a receiver measuring the surface acoustic waves propagated on the input surface; a memory storing, as reference values, measurement values of the surface acoustic waves when the cover film is not being pressed; and a determination section detecting, as touch input positions, positions at which a difference between the measurement values of the surface acoustic waves when the touch panel is being used and the reference values is significant.
85 Citations
7 Claims
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1. A touch panel comprising:
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a touch panel substrate having an input surface; a cover film arranged separately from the input surface, and facing to the input surface; spacers extending upright from the touch panel substrate toward the cover film; a transmitter causing surface acoustic waves to be propagated on the input surface; a receiver measuring the surface acoustic waves propagated on the input surface; a memory storing, as reference values, measurement values of the surface acoustic waves when the cover film is not being pressed; and a determination section detecting, as touch input positions, positions at which a difference between the measurement values of the surface acoustic waves when the touch panel is being used and the reference values is significant.
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2. A method for detecting a touch input position on a touch panel, comprising:
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recording, as reference values, measurement values of surface acoustic waves when a cover film arranged separately from an input surface of a touch panel substrate and facing the input surface is not being pressed; and detecting, as touch input positions, positions at which a difference between the measurement values of the surface acoustic waves when the touch panel is being used and the reference values is significant.
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3. An electro-optic device comprising:
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an image display device on which a plurality of pixels are arrayed in rows; and a touch panel arranged on an image display side of the image display device, wherein the touch panel includes; a touch panel substrate having an input surface; a cover film arranged separately from the input surface, and facing to the input surface; spacers extending upright from the touch panel substrate toward the cover film; a transmitter causing surface acoustic waves to be propagated on the input surface; a receiver measuring the surface acoustic waves propagated on the input surface; a memory storing, as reference values, measurement values of the surface acoustic waves when the cover film is not being pressed; and a determination section detecting, as touch input positions, positions at which a difference between the measurement values of the surface acoustic waves when the touch panel is being used and the reference values is significant. - View Dependent Claims (4, 5, 6, 7)
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Specification
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Current AssigneeSeiko Epson Corporation (Seiko Group)
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Original AssigneeSeiko Epson Corporation (Seiko Group)
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InventorsSakurai, Shinji, Funasaka, Tsukasa, Taguchi, Satoshi
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Application NumberUS11/654,307Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current345/177CPC Class CodesG06F 3/0412 Digitisers structurally int...G06F 3/0436 in which generating transdu...
