OPTICAL TOUCH APPARATUS AND TOUCH SENSING METHOD THEREOF

摘要

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.

主权项

1. An optical touch apparatus, comprising:
a light curtain generator, adapted to provide a light curtain on a detection surface, wherein the light curtain is parallel to the detection surface; a light detection apparatus, adapted to capture an image corresponding to the light curtain on the detection surface; and an operation unit, coupled to the light detection apparatus and the light curtain generator, wherein, in a predetermined period where no touch object is on the detection surface, the operation unit is adapted to control the light curtain generator to generate the light curtain and obtain a first image by using the light detection apparatus, analyze the first image to obtain an interference signal of an interfering object on the detection surface, and set an area where the interfering object corresponding to the interference signal is located on the detection surface as an interference area, and wherein, during a touch operation period, the operation unit is adapted to control the light curtain generator to generate the light curtain, obtain a second image by using the light detection apparatus, analyze and determine whether a touch object corresponding to a touch signal in the second image is located in the interference area, and calculate a respective touch coordinate of a touch position of the touch object corresponding to the touch signal based on the touch signal of the touch object not located in the interference area.