Abstract: A touch panel system using modulated light beams to enable the system to detect when one or more of the light beams are blocked even in bright ambient light conditions. The system has a "touch sensitive" display surface with a defined perimeter. Surrounding the display surface are a multiplicity of light emitting elements and light receiving elements. These elements are located so that the light paths defined by selected pairs of light emitting and light receiving elements cross the display surface and define a grid of intersecting light paths. A scanning circuit sequentially enables selected pairs of the light emitting and light receiving elements, modulating the amplitude of the light emitted in accordance with a predetermined pattern. A filter generates a blocked path signal if the currently enabled light receiving element is not generating an output signal modulated in accordance with the predetermined pattern.

Abstract: A touch panel system having enhanced touch detection which distinguishes between deliberate actuations of the touch system and accidental and other false actuations. The system has a display surface surrounded by a multiplicity of light emitting elements and light receiving elements that define a grid of intersecting light paths. The display surface is scanned by sequentially enabling selected pairs of the light emitting and light receiving elements. False actuation rejection involves the use of one or more of three techniques: ignoring touches which fail to block a minimum number of contiguous beams in both axes, ignoring touches which block in excess of a specified maximum number of contiguous beams in either axis, and ignoring touches which are of a duration of less than a minimum specified time. The minimum and maximum size constraints on the size of the object touching the screen, and the minimum contact time are programmable.

Abstract: A touch panel assembly includes a filter plate having a recessed outer surface, first and second "L"-shaped supports each including a plurality of light-emitting or detecting elements along edges thereof with the "L"-shaped supports positioned adjacent to the inner surface of the filter plate and about the recessed outer surface whereby light from a lamp passes through the recessed outer surface to a detector element. A display is positioned in alignment with the recessed outer surface. The assembly is compact and facilitates the sealing of the display and electronics within a housing. The "L"-shaped supports for the light sources and detectors facilitate the assembly and servicing of the light elements in the assembly.