METHOD OF CANCELLING ABERRATIONS IN A LASER TOUCH PANEL REFLECTIVE SURFACE

METHOD OF CANCELLING ABERRATIONS IN A LASER TOUCH PANEL REFLECTIVE SURFACE

A method and apparatus that distinguish a valid touch from an optical aberration caused by unwanted objects and/or scratches in the light plane of an optical touch panel device are disclosed. During a training mode the device learns the relative position of "aberration dropouts" caused by...

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Bibliographische Detailangaben
Hauptverfasser: BLUE, LARRY ALLEN, FREEDMAN, BRUCE TODD, GONZALEZ-HERES, JOSE FRANCISCO, MACINNIS, ALEXANDER GARLAND
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Beschreibung
Zusammenfassung:A method and apparatus that distinguish a valid touch from an optical aberration caused by unwanted objects and/or scratches in the light plane of an optical touch panel device are disclosed. During a training mode the device learns the relative position of "aberration dropouts" caused by the unwanted objects. During normal operating mode the relative positions of "touch and aberration dropouts" are generated and compared with the relative position of aberration dropouts to distinguish between aberration dropout signals and touch dropout signals. The touch dropout signals are subjected to further processing to determine the precise location of a touch while the aberration dropout signals are discarded.