An optical touch panel including a support, an optical light guide illumination assembly arranged along and above at least most of a periphery of the support to define a detection region, the assembly including at least one optical light guide and a light source arranged for directing light along the at least one optical light guide, at least one light detector, arranged to detect changes in the light received from the optical light guide illumination assembly produced by the presence of an object in the detection region and detection circuitry receiving at least one output from the at least one light detector and providing an output indication of the two dimensional location of the object present in the detection region.
REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 11/691,510, filed Mar. 27, 2007 now U.S. Pat. No. 7,333,094, entitled "OPTICAL TOUCH SCREEN", the contents of which are incorporated by reference.
Reference is made to U.S. Provisional Patent Application Ser. No. 60/827,223, filed Sep. 28, 2006 and entitled OPTICAL SENSING SYSTEM, the disclosure of which is hereby incorporated by reference and priority of which is hereby claimed pursuant to 37 CFR 1.78(a) (4) and (5)(i).
