Method and device for position detection

摘要

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.

主权项

1. 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 partial output electrical signals generated based on different portions of multiple SAWs, the partial output electrical signals gradually diminish, wherein each SAW comprises a plurality of received signals passing through different paths; 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 each depression has a size 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.