Touch screen signal processing
First Claim
1. A coordinate detection system, comprising:
- a display screen;
a touch surface corresponding the top of the display screen or a material positioned above the screen and defining a touch area;
at least one camera positioned outside the touch area and configured to capture an image of space above the touch surface;
an illumination system comprising a light source, the illumination system configured to project light from the light source through the touch surface and toward the space above the touch surface in which at least one object can be positioned, wherein the at least one camera is configured to capture the image by detecting light reflected by the at least one object in the space above the touch surface; and
a processor configured to execute program code to determine, based on the image captured by the at least one camera, whether the at least one object interferes with the light from the light source projected through the touch surface.
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Accused Products
Abstract
A coordinate detection system can comprise a display screen, a touch surface corresponding the top of the display screen or a material positioned above the screen and defining a touch area, at least one camera outside the touch area and configured to capture an image of space above the touch surface, an illumination system comprising a light source, the illumination system configured to project light from the light source through the touch surface, and a processor executing program code to identify whether an object interferes with the light from the light source projected through the touch surface based on the image captured by the at least one camera. Light can be directed upward by sources positioned behind the screen, by sources positioned behind the screen that direct light into a backlight assembly that directs the light upward, and/or by a forward optical assembly in front of the screen that directs the light upward.
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Citations
19 Claims
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1. A coordinate detection system, comprising:
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a display screen; a touch surface corresponding the top of the display screen or a material positioned above the screen and defining a touch area; at least one camera positioned outside the touch area and configured to capture an image of space above the touch surface; an illumination system comprising a light source, the illumination system configured to project light from the light source through the touch surface and toward the space above the touch surface in which at least one object can be positioned, wherein the at least one camera is configured to capture the image by detecting light reflected by the at least one object in the space above the touch surface; and a processor configured to execute program code to determine, based on the image captured by the at least one camera, whether the at least one object interferes with the light from the light source projected through the touch surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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projecting light from a light source through a touch surface and toward a space above the touch surface in which at least one object can be positioned, the touch surface corresponding to the top of a display screen or a material positioned above the display screen, the touch surface defining a touch area; capturing, by at least one camera positioned outside the touch area, an image of space above the touch surface, wherein the image is captured by detecting light reflected by the at least one object in the space above the touch surface; and using a processor, determining, based on an image captured by the at least one camera, whether the at least one object has interfered with the light from the light source. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification