Optical touch screen
First Claim
1. An optical touch panel comprising:
- a support;
an optical fiber illumination assembly arranged along and above at least part of a periphery of said support to define a detection region, said assembly including;
at least one optical fiber having a core and cladding, said at least one optical fiber having a cross section defining a circumference, said at least one optical fiber having at least one light scattering discontinuity at least one location therealong, said at least one optical fiber having optical power at least one light transmissive region having a focus located in proximity to said discontinuity, said at least one optical fiber extending along three sides of said detection region; and
a light source arranged for directing light along said at least one optical fiber;
at least one light detector, arranged to detect changes in the light received from said optical fiber illumination assembly produced by the presence of a finger or stylus in said detection region, said at least one detector comprising a pair of detectors located at adjacent corners of said detection region alongside ends of said at least one optical fiber; and
detection circuitry receiving at least one output from said at least one light detector and providing an output indication of the two dimensional location of finger or stylus impingement in said detection region, said detection circuitry operating at least partially by triangulation.
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Accused Products
Abstract
An optical touch panel including a support, an optical fiber illumination assembly arranged along and above at least part of a periphery of the support to define a detection region, the assembly including at least one optical fiber and a light source arranged for directing light along the at least one optical fiber, at least one light detector, arranged to detect changes in the light received from the optical fiber illumination assembly produced by the presence of a finger or stylus 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 finger or stylus impingement in the detection region.
81 Citations
11 Claims
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1. An optical touch panel comprising:
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a support; an optical fiber illumination assembly arranged along and above at least part of a periphery of said support to define a detection region, said assembly including; at least one optical fiber having a core and cladding, said at least one optical fiber having a cross section defining a circumference, said at least one optical fiber having at least one light scattering discontinuity at least one location therealong, said at least one optical fiber having optical power at least one light transmissive region having a focus located in proximity to said discontinuity, said at least one optical fiber extending along three sides of said detection region; and a light source arranged for directing light along said at least one optical fiber; at least one light detector, arranged to detect changes in the light received from said optical fiber illumination assembly produced by the presence of a finger or stylus in said detection region, said at least one detector comprising a pair of detectors located at adjacent corners of said detection region alongside ends of said at least one optical fiber; and detection circuitry receiving at least one output from said at least one light detector and providing an output indication of the two dimensional location of finger or stylus impingement in said detection region, said detection circuitry operating at least partially by triangulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification