Low power operation of an optical touch-sensitive device for detecting multitouch events
First Claim
1. A method for resolving touch events on a surface, the surface having emitters and detectors arranged around its periphery, the emitters producing optical beams received by the detectors, the touch events disturbing the optical beams, the method comprising:
- obtaining an approximate location of a region of the surface at which a touch event will occur, wherein a first set of detector-emitter pairs is configured to use a narrow radiant coverage to determine the approximate location;
selecting a precision detection scheme based on the approximate location, the detection scheme configured to determine a location of the touch event with greater precision than the approximate location, wherein the precision detection scheme comprises scanning using a second set of detector-emitter pairs configured to use a wider radiant coverage than the narrow radiant coverage; and
scanning using the detection scheme to determine the location of the touch event on the surface.
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Accused Products
Abstract
An optical touch-sensitive device is able to determine the locations of multiple simultaneous touch events. The optical touch-sensitive device includes multiple emitters and detectors. Each emitter produces optical beams which are received by the detectors. Touch events disturb the optical beams. Detection schemes define the operation of the touch capability. Different detection schemes consume different amounts of power and may be used in combination to reduce overall power consumption.
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Citations
29 Claims
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1. A method for resolving touch events on a surface, the surface having emitters and detectors arranged around its periphery, the emitters producing optical beams received by the detectors, the touch events disturbing the optical beams, the method comprising:
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obtaining an approximate location of a region of the surface at which a touch event will occur, wherein a first set of detector-emitter pairs is configured to use a narrow radiant coverage to determine the approximate location; selecting a precision detection scheme based on the approximate location, the detection scheme configured to determine a location of the touch event with greater precision than the approximate location, wherein the precision detection scheme comprises scanning using a second set of detector-emitter pairs configured to use a wider radiant coverage than the narrow radiant coverage; and scanning using the detection scheme to determine the location of the touch event on the surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An optical touch-sensitive device capable of resolving touch events comprising:
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a surface on which touch events are to be detected; emitters and detectors arranged around a periphery of the surface, the emitters producing optical beams received by the detectors, the touch events disturbing the optical beam; and a touch event processor coupled, directly or indirectly, to the emitters and detectors, the touch event processor configured to; obtain an approximate location of a region of the surface at which a touch event will occur, wherein a first set of detector-emitter pairs is configured to use a narrow radiant coverage to determine the approximate location; select a precision detection scheme based on the approximate location, the detection scheme configured to determine a location of the touch event with greater precision than the approximate location, wherein the precision detection scheme comprises scanning using a second set of detector-emitter pairs configured to use a wider radiant coverage than the narrow radiant coverage; and scan using the detection scheme to determine the location of the touch event on the surface. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for resolving touch events on a surface, the surface having emitters and detectors arranged around its periphery, the emitters producing optical beams received by the detectors, the touch events disturbing the optical beams, the method comprising:
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scanning the center area using a precision detection scheme and scanning a periphery of the center area using a coarse detection scheme, the precision detection scheme configured to determine a location of a touch event with greater precision than the coarse detection scheme; and determining the location of the touch event on the surface based on both the precision detection scheme and the coarse detection scheme. - View Dependent Claims (26, 27, 28, 29)
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Specification