OPTICAL TOUCH SENSING DEVICE AND TOUCH SIGNAL DETERMINATION METHOD THEREOF
First Claim
1. An optical touch sensing device, comprising:
- a light source module, disposed on a touch surface and providing a detecting light to the touch surface;
at least one image capturing element, capturing an optical touch data along the touch surface based on the detecting light; and
a processing unit, coupled to the at least one image capturing element to receive the optical touch data, recognizing the optical touch data according a recognition threshold to obtain a plurality of touch signals and a plurality of touch coordinates and a plurality of covering parameters corresponding to the touch signals, and comparing whether an objecting spacing between the touch coordinates is smaller than or equal to a palm spacing,wherein when the object spacing between the touch signals is smaller than or equal to the palm spacing, the processing unit compares the covering parameters corresponding to the touch signals to select a largest covering parameter among the covering parameters and determines whether to ignore the touch signal corresponding to the largest covering parameter according to a relationship between the largest covering parameter and an area threshold.
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Accused Products
Abstract
An optical touch sensing device and a touch signal determining method thereof are provided. The optical touch sensing device includes a light source module, at least one image capturing element and a processing unit. The light source module disposed on a touch surface provides a detecting light to the touch surface. The image capturing element captures an optical touch data along the touch surface based on the detecting light. The processing unit recognizes the optical touch data according to a recognition threshold to obtain multiple touch signals. When a object spacing between the touch signals is no bigger than a palm spacing, the processing unit compares the covering parameters corresponding to the touch signals to select a largest covering parameter among the covering parameters, and determines whether to ignore the touch signal corresponding to the largest covering parameter according to the largest covering parameter and an area threshold.
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Citations
11 Claims
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1. An optical touch sensing device, comprising:
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a light source module, disposed on a touch surface and providing a detecting light to the touch surface; at least one image capturing element, capturing an optical touch data along the touch surface based on the detecting light; and a processing unit, coupled to the at least one image capturing element to receive the optical touch data, recognizing the optical touch data according a recognition threshold to obtain a plurality of touch signals and a plurality of touch coordinates and a plurality of covering parameters corresponding to the touch signals, and comparing whether an objecting spacing between the touch coordinates is smaller than or equal to a palm spacing, wherein when the object spacing between the touch signals is smaller than or equal to the palm spacing, the processing unit compares the covering parameters corresponding to the touch signals to select a largest covering parameter among the covering parameters and determines whether to ignore the touch signal corresponding to the largest covering parameter according to a relationship between the largest covering parameter and an area threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch signal determining method for an optical touch sensing device, comprising:
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receiving an optical touch data based on a detecting light on a touch surface through using at least one image capturing element; recognizing the optical touch data to obtain a plurality of touch signals and a plurality of touch coordinates and a plurality of covering parameters corresponding to the touch signals according to a recognition threshold; comparing whether an object spacing between the touch coordinates is smaller than or equal to a palm spacing; comparing the covering parameters corresponding to the touch signals to select a largest covering parameter among the covering parameters when the object spacing between the touch signals is smaller than or equal to the palm spacing; and ignoring the touch signal corresponding to the largest covering parameter when the largest covering parameter is greater than an area threshold. - View Dependent Claims (8, 9, 10, 11)
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Specification