Patent ID: 8643608

Claim:
An optical touch panel comprising: a rectangular position-detecting surface; a frame-shaped circuit board surrounding the rectangular position-detecting surface; a plurality of light-emitting elements configured for emitting a plurality of light beams, wherein the plurality of light-emitting elements are arranged at various points along a first side of the rectangular position-detecting surface and disposed on the frame-shaped circuit board; a plurality of light-receiving elements configured for receiving the plurality of light beams emitted by the plurality of light-emitting elements; a plurality of surface mount technology (SMT) components configured as optical gates for isolating ambient light to prevent erroneous light detection, wherein the plurality of SMT components comprise thin film resistors; and a control circuit configured for causing the plurality of light-emitting elements to emit the plurality of light beams in a predetermined order and further configured for causing the plurality of light-receiving elements to receive the plurality of light beams, thereby forming optical paths on the position-detecting surface in a grid pattern; wherein the plurality of SMT components and the plurality of light-receiving elements are alternatively arranged at various points along a second side of the rectangular position-detecting surface opposite to the first side and disposed on the frame-shaped circuit board, and wherein the plurality of light-receiving elements are arranged at locations behind the plurality of SMT components.