Optical touch apparatus and operating method thereof

A method of operating an optical touch apparatus, at least one light sensing module being set at a first side of a surface of the optical touch apparatus, a reference region being set at a second side opposite to the first side on the surface, the method comprising the steps of:

• emitting at least one light simultaneously or sequentially;
• receiving the at least one light and generating a sensing result based on the condition of receiving the at least one light, wherein the sensing result relates to whether the at least one light is blocked by at least one object above the surface and also relates to a comparing result between the at least one object and a reference region, the reference region is set at a second side opposite to the first side on the surface;
• and
• determining at least one touch point position corresponding to the at least one object on the surface according to the sensing result;
• wherein the at least one object is set at a reference point to form a reference touch point, a reference distance between the reference touch point and the first side is known, and a first dark region formed at the second side when the at least one object blocks the at least one light emitted to the at least one light sensing module has a first size, when the at least one object is moved to a specific touch point position, a second dark region formed at the second side when the at least one object blocks the at least one light emitted to the at least one light sensing module has a second size, the optical touch apparatus obtains a specific distance between the specific touch point position and the first side based on the first size and the second size, and obtains a coordinate of the specific touch point position based on the reference distance and the specific distance, a plurality of reflecting modules is further set at the second side of the surface to eliminate possible sensing blind angles in a reflecting way, and the position of a gap between two of the plurality of reflecting modules corresponds to the position of the at least one light sensing module.