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US 2013/0257818 A1Published application
Method and device for position detection
AssigneeEgalax_Empia Technology Inc.
InventorsSHANG-TAI YEH, Teng-Wei Hsieh
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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.
Claims12
A position detecting method, comprising:
- generating a complete output electrical signal when a surface acoustic wave (SAW) touch panel is untouched, the complete output electrical signal being formed by combining multiple segments of partial output electrical signals generated based on different portions of multiple SAWs;
- generating a complete output electrical signal when the SAW touch panel is being touched;
- comparing the complete output electrical signal when the SAW touch panel is being touched with the complete output electrical signal when the SAW touch panel is untouched to detect one or more depressions in the complete output electrical signal when the SAW touch panel is being touched, wherein the size of each depression is larger than a threshold;
- and
- detecting a position based on each depression,
- wherein, before detecting the position of each depression that spans over multiple partial output electrical signals, at least one of the partial output electrical signals over which the respective depression spans is enlarged or shrunk.
3 more elements
A position detecting device, comprising:
- 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:
- providing a partial output electrical signal based on a different portion of each received SAW segment and combining all of the partial output electrical signals to form a complete output electrical signal;
- comparing the complete output electrical signal with a complete output electrical signal when the SAW touch panel is untouched to detect one or more depressions in the complete output electrical signal when the SAW touch panel is being touched, wherein the size of each depression is larger than a threshold;
- and
- detecting a position based on each depression,
- wherein, before detecting the position of each depression that spans over multiple partial output electrical signals, at least one of the partial output electrical signals over which the respective depression spans is enlarged or shrunk.
7 more elements
Dependencies are inferred from the claim text.