OPTICAL TOUCH APPARATUS AND TOUCH SENSING METHOD THEREOF
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United States of America Patent
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Issued Date -
Jun 30, 2016
app pub date -
Jul 23, 2015
filing date -
Jul 23, 2015
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Abstract
The invention provides an optical touch apparatus including a light curtain generator, a light detection apparatus, and an operation unit, and a touch sensing method thereof. In a predetermined period where no touch object is on the detection surface, the operation unit controls the light curtain generator to generate a light curtain and obtains a first image by using the light detection apparatus, analyzes the first image to obtain an interference signal, and sets an area where the interference signal is located on the detection surface as an interference area. During a touch operation period, the operation unit obtains a second image, analyzes and determines whether a touch object of a touch signal in the second image is located in the interference area, and calculates a respective touch coordinate of the touch object corresponding to the touch signal based on the touch signal not located in the interference area.
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