LIGHT-BASED TOUCH SCREEN
0 Assignments
0 Petitions
Accused Products
Abstract
A light-based touch screen, including a housing for a display screen, a plurality of infra-red light emitting diodes (LEDs), fastened on the housing, for generating light beams, at least one LED selector, fastened on the housing and connected with the plurality of LEDs, for controllably selecting and deselecting one or more of the plurality of LEDs, a plurality of photodiode (PD) receivers, fastened on the housing, for measuring light intensity, at least one PD selector, fastened on the housing and connected with the plurality of PD receivers, for controllably selecting and deselecting one or more of the plurality of PD receivers, an optical assembly, fastened on the housing, for projecting light beams emitted by the plurality of LEDs in substantially parallel planes over the housing, and a controller, fastened on the housing and coupled with the plurality of PD receivers, (i) for controlling the at least one LED selector, (ii) for controlling the at least one PD selector, and (iii) for determining therefrom position and velocity of an object crossing at least one of the substantially parallel planes, based on output currents of the plurality of PD receivers.
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Citations
38 Claims
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1-20. -20. (canceled)
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21. A touch surface assembly for an electronic device, comprising:
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a surface that can be touched by an object from above; a projector that projects light above said surface; a barrier positioned in front of said projector, that blocks a portion of the light projected by said projector, thereby generating a light pattern; a lens positioned in front of said projector and said barrier, that spreads the light pattern generated by said barrier, such that the object, when suitably positioned above the screen, reflects at least a portion of the light pattern spread by said lens; and a camera aimed above said surface that captures one or more images of the light pattern spread by said lens and reflected by the object, wherein a controller in communication with said camera determines location of the object relative to said surface by analyzing the one or more images captured by said camera. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method for operating a touch surface, comprising:
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projecting light above a surface, wherein the surface can be touched by an object from above; blocking a portion of the light projected by said projecting, to generate a light pattern; spreading the generated light pattern such that the object, when suitably positioned above the screen, reflects at least a portion of the light pattern spread by said lens; capturing one or more images of the light pattern spread by said spreading and reflected by the object; and analyzing the one or more images captured by said capturing, to determine location of the object relative to the surface. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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Specification