Patent ID: 8373680

Claim:
A coordinate information correction method for an optical touch panel, the optical touch panel including a touch surface, a light source module disposed to define a light curtain region on one side of the touch surface, at least two light detectors which are disposed at at least one edge of a periphery of the touch surface and which are spaced apart from each other, each of the light detectors having a field of detection along the touch surface, the light detectors being arranged in a manner that at least portions of the fields of detection of the light detectors overlap with each other and that the light detectors are able to detect changes in intensity of the light received from the light source module that are produced as a result of the presence of an object in the light curtain region, and a processor receiving output signals from the at least two light detectors, said coordinate information correction method comprising: a) determining, using the processor, a set of to-be-corrected included angle values according to the output signals, each of the to-be-corrected included angle values representing an included angle between a base line and a connecting line that extends from a respective one of the light detectors to a location of the object in the light curtain region; b) calculating, using the processor, a set of correction values, each of which is a finite order function of a respective one of the to-be-corrected included angle values; c) calculating, using the processor, a set of corrected included angle values from the set of to-be-corrected included angle values and the set of correction values; and d) generating, using the processor, corrected coordinate information associated with the location of the object in the light curtain region from the corrected included angle values.