Patent ID: 8035625

Claim:
A touch screen comprising: picture means having an upper surface providing picture information; and an optical module only positioned on a single side of the picture means for directly emitting invisible rays substantially parallel to the upper surface of the picture means without moving the optical module or a mirror, and for detecting invisible rays reflected by an object, wherein the optical module comprising: a light source generating invisible rays; a first lens system positioned between the light source and an optical filter, the first lens system diffusing invisible rays generated in the light source so that the invisible rays have an emission angle covering whole area of the picture means; the optical filter positioned to face the light source and an optical sensor, invisible rays emitted from the light source being penetrated through the optical filter to the upper surface of the picture means, and reflecting invisible rays being reflected off the object on the upper surface of the picture means, and the reflecting invisible rays reflected off the object being provided directly into the optical filter; and the optical sensor for detecting invisible rays reflected by the object on the upper surface of the picture means that is in the path of a least a portion of the invisible rays generated by the light source.