Optical touch panel system and positioning method thereof

摘要

The present invention discloses an optical touch panel system and a positioning method for positioning an object existing in a touch control area. The system includes: at least one reflective element disposed on a side of the touch control area; at least one light guide module disposed on a side of the touch control area adjacent to or opposite the reflective element and emitting light; an image sensor capturing an image of the object; a plurality of photo detectors arranged on a side of the touch control area adjacent to the image sensor and sensing the object to obtain shade information; and a processor calculating the coordinates of the object according to the image and the shade information.

主权项

1. An optical touch panel system for positioning an object existing in a touch control area including a first side, a second side adjacent to a first end of the first side, a third side opposite the first side, and a fourth side adjacent to a first end of the first side, the optical touch panel system comprising:
at least one reflective element disposed on the first side of the touch control area; at least two light guide modules respectively disposed on the second and third sides of the touch control area adjacent to and opposite the reflective element, the light guide modules emitting light; an image sensor for capturing an image of the object; a plurality of first photo-detectors arranged on the fourth side of the touch control area adjacent to the image sensor, the first photo-detectors sensing the object to obtain first shade information; a plurality of second photo detectors for sensing the object to obtain second shade information, wherein the second photo detectors are
(1) disposed non-symmetrically along the first side of the touch control area on which the reflective element is, and the second photo detectors are adjacent to the first photo detectors and farther from the second side; or(2) disposed non-symmetrically along the third side of the touch control area opposite the reflective element, and the second photo detectors are adjacent to the image sensor and farther from the second side; and a processor for calculating the coordinates of the object according to the image of the object and the first and second shade information, wherein: in a first period, the two light guide modules simultaneously emit light, and the image sensor captures the image in this first period; in a second period, the light guide module on the second side emits light and the light guide module on the third side is turned off, whereby when the first photo-detectors sense the object in this second period, the first photo-detectors receive light from a front side of the first photo-detectors but not a lateral side of first photo-detectors; and in a third period, the light guide module on the third side emits light and the light guide module on the second side is turned off, whereby when the second photo detectors sense the object in this third period, the second photo detectors only receive the light from their front side but not their lateral side.