Patent attributes
An optical touch system including an optical touch apparatus and an optical touch stylus is provided. The optical touch apparatus includes a curved operation surface and a plurality of optical sensors. The curved operation surface has a vertex. The optical touch stylus performs a touch operation on the curved operation surface, and has a tip portion for generating a light signal. The optical sensors are arranged on a side of the curved operation surface based on a reference line. The optical sensors are configured to receive the light signal to sense the touch operation of the optical touch stylus performed on the curved operation surface. A surface sag exists between each of the optical sensors and the vertex. A difference between a tip length of the optical touch stylus and a distance of two selected surface sags is not smaller than a region parameter of the optical touch system.
