TOUCH SCREEN SIGNAL PROCESSING
1 Assignment
0 Petitions
Accused Products
Abstract
A touch screen which uses light sources at one or more edges of the screen which directs light across the surface of the screen and at least two cameras having electronic outputs located at the periphery of the screen to receive light from said light sources. A processor receives the outputs of said cameras and employs triangulation techniques to determine the location of an object proximate to said screen. Detecting the presence of an object includes detecting at the cameras the presence or absence of direct light due to the object, using a screen surface as a mirror and detecting at the cameras the presence or absence of reflected light due to an object. The light sources may be modulated to provide a frequency band in the output of the cameras.
59 Citations
79 Claims
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1-9. -9. (canceled)
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10. A touch display comprising:
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a screen for a user to touch and view an image on or through; light sources at one or more edges in front of said screen, said light sources directing light across the surface of said screen; at least two cameras having outputs located at the periphery of said screen, said cameras located so as not to receive direct light from said light sources, each said camera imaging said surface in front of said screen, said output including a mirrored image; means for processing said outputs to detect level of reflected light and the level of light from said mirror image; and a processor receiving the processed outputs of said cameras, said processor employing triangulation techniques and said processed outputs to determine whether the processed outputs indicate the presence of an object proximate to said screen and if so the location of said object. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A touch display comprising:
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a screen for a user to touch and view an image on or through; light sources at one or more edges behind said screen, said light sources directing light across the surface of said screen; at least two cameras having outputs located at the periphery of said screen, said cameras located so as not to receive direct light from said light sources, each said camera imaging said surface in front of said screen, said output including a mirror image; means for processing said outputs to detect level of reflected light and the level of light from said mirror image; and a processor receiving the processed outputs of said cameras, said processor employing triangulation techniques and said processed outputs to determine whether the processed outputs indicate the presence of an object proximate to said screen and if so the location of said object. - View Dependent Claims (21, 22, 23, 24, 26, 27, 28, 29, 30)
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31-67. -67. (canceled)
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68. A method of receiving user inputs in reference to an image including the steps of:
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providing a screen for a user to touch and view an image on or through; providing light sources at one or more edges behind said screen, said light sources directing light across the surface of said screen; providing at least two cameras having outputs located at the periphery of said screen, said cameras located so as not to receive direct light from said light sources, each said camera imaging said surface in front of said screen, said output including a mirror image; processing said outputs to detect the level of reflected light and the level of light from said mirror image; and processing the processed outputs of said cameras, employing triangulation techniques and said processed outputs to determine whether the processed outputs indicate the presence of an object proximate to said screen and if so the location of said object. - View Dependent Claims (69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
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79-88. -88. (canceled)
Specification