DETECTING THE LOCATIONS OF A PLURALITY OF OBJECTS ON A TOUCH SURFACE

An apparatus is controlled to detect locations of a plurality of objects on a touch surface of a panel (1). An input scanner arrangement introduces at least three beams (B1- B6) of radiation into the panel (1) for propagation by internal reflection, and sweeps the beams (B1-B6) inside the panel acro...

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Bibliographic Details
Main Authors WASSVIK, OLA, CHRISTIANSSON, TOMAS
Format Patent
LanguageEnglish
French
Published 21.01.2010
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:An apparatus is controlled to detect locations of a plurality of objects on a touch surface of a panel (1). An input scanner arrangement introduces at least three beams (B1- B6) of radiation into the panel (1) for propagation by internal reflection, and sweeps the beams (B1-B6) inside the panel across a sensing area, preferably in at least two different principal directions (R1, R2). At least one radiation detector is arranged to receive the beams (B1-B6) from the input scanner arrangement while they are swept across the sensing area. A data processor is connected to the radiation detector(s) and operated to identify the locations based on an attenuation of the beams (B1-B6) caused by the objects touching the touch surface within the sensing area, the attenuation being identifiable from an output signal of the radiation detector(s). Each output signal may be further processed to generate a transmission signal, by dividing the output signal by a background signal which represents the output signal without any object on the touch surface.
Bibliography:Application Number: CA20092728030