Optical touch panel
First Claim
1. An optical touch panel assembly, comprising:
- a touch panel that includes photosensors and light sources, wherein each light source is energizable to produce a field of illumination that illuminates multiple photosensors at a time; and
control circuitry to energize and de-energize the light sources so that at least one but less than all of the light sources are turned on at a time in a sequence to illuminate an entire active area of the touch panel, to analyze output signals from the photosensors, to identify a low level output signal corresponding to a proximity event, and to determine a location of the proximity event on the touch panel.
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Accused Products
Abstract
An optical touch panel assembly includes a touch panel that has photosensors and light sources, wherein each light source is energizable to produce a field of illumination that illuminates multiple photosensors at a time. The touch panel also includes control circuitry to energize and de-energize the light sources so that at least one but less than all of the light sources are turned on at a time in a sequence to illuminate an entire active area of the touch panel and to analyze output signals from the photosensors. The control circuitry is further configured to identify a low level output signal corresponding to a proximity event and to determine a location of the proximity event on the touch panel.
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Citations
33 Claims
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1. An optical touch panel assembly, comprising:
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a touch panel that includes photosensors and light sources, wherein each light source is energizable to produce a field of illumination that illuminates multiple photosensors at a time; and control circuitry to energize and de-energize the light sources so that at least one but less than all of the light sources are turned on at a time in a sequence to illuminate an entire active area of the touch panel, to analyze output signals from the photosensors, to identify a low level output signal corresponding to a proximity event, and to determine a location of the proximity event on the touch panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An optical touch panel assembly, comprising:
a touch panel that includes a light source, a photosensor, and an optical component associated with the photosensor so that the photosensor is substantially only sensitive to light emitted by the light source. - View Dependent Claims (25, 26, 27)
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28. A method of operating a touch panel that includes photosensors and light sources to determine a location of one or more proximity events on the touch panel, comprising the steps of:
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energizing and de-energizing the light sources so that at least one but less than all of the light sources are turned on at a time in a sequence to illuminate an entire active area of the touch panel; activating the photosensors to develop output signals corresponding to light that impinges on the photosensors; analyzing the output signals from the photosensors to identify a low level output signal corresponding to a proximity event; and processing the low level output signal to determine a location of the proximity event on the touch panel. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification