METHOD AND DEVICE FOR POSITION DETECTION
First Claim
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1. A position detecting method, comprising:
- performing a first detecting stage including;
receiving a partial output electrical signal provided by a different portion of each received surface acoustic wave (SAW) segment and combining all of the partial output electrical signals to form a complete output electrical signal;
detecting one or more first-stage depression in the complete output electrical signal, wherein each first-stage depression is larger than a threshold; and
determining a position based on each first-stage depression, when a first-stage depression spanning over multiple partial output electrical signals, performing a second detecting stage, including;
generating a segment of second-stage SAW based on each first-stage depression spanning over multiple partial output electrical signals, and generating a second-stage output electrical signal based on the received second-stage SAW; and
detecting the position based on a portion in the second-stage output electrical signal corresponding to the first-stage depression.
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Abstract
The present invention provides a method and device for position detection. For detection of a touch position, a segment of surface acoustic wave (SAW) is provided multiple times to be propagated on a SAW touch panel, and the multiple SAW segments are received by the SAW touch panel. In addition, during or after reception, partial output electrical signals are provided based on different portions of each received SAW segment to construct a complete output electrical signal.
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10 Claims
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1. A position detecting method, comprising:
performing a first detecting stage including; receiving a partial output electrical signal provided by a different portion of each received surface acoustic wave (SAW) segment and combining all of the partial output electrical signals to form a complete output electrical signal; detecting one or more first-stage depression in the complete output electrical signal, wherein each first-stage depression is larger than a threshold; and determining a position based on each first-stage depression, when a first-stage depression spanning over multiple partial output electrical signals, performing a second detecting stage, including; generating a segment of second-stage SAW based on each first-stage depression spanning over multiple partial output electrical signals, and generating a second-stage output electrical signal based on the received second-stage SAW; and detecting the position based on a portion in the second-stage output electrical signal corresponding to the first-stage depression. - View Dependent Claims (2, 3, 4, 5)
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6. A position detecting device, comprising:
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a surface acoustic wave (SAW) touch panel including a reflector array distributed on four sides of the SAW touch panel and a sensing device, the sensing device including; a first vertical-axis transducer element and a first horizontal-axis transducer element for providing multiple SAW segments to be propagated on the SAW touch panel; a second vertical-axis transducer element and a second horizontal-axis transducer element for receiving the SAWs propagated on the SAW touch panel; and a control circuit for performing the following; performing a first detecting stage including; receiving a partial output electrical signal provided by a different portion of each received SAW segment and combining all of the partial output electrical signals to form a complete output electrical signal; detecting one or more first-stage depression in the complete output electrical signal, wherein each first-stage depression is larger than a threshold; and determining a position based on each first-stage depression, when a first-stage depression spanning over multiple partial output electrical signals, performing a second detecting stage, including; generating a segment of second-stage SAW based on each first-stage depression spanning over multiple partial output electrical signals, and generating a second-stage output electrical signal based on the received second-stage SAW; and detecting the position based on a portion in the second-stage output electrical signal corresponding to the first-stage depression. - View Dependent Claims (7, 8, 9, 10)
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Specification