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US 9,430,091 B2Granted
Coordinate positioning module, optical touch system, method of detecting power of an active touch medium, and method of switching modes of the active touch medium
AssigneePixart Imaging Inc.
InventorChun-Yi Lu
Life of this patent
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Abstract
A method of detecting power of an active touch medium is disclosed in the present invention. The method includes capturing an image with an optical signal generated from the active touch medium, reading a first threshold value, comparing an intensity of the optical signal and the first threshold value, and executing a low power mode when the intensity of the optical signal is smaller than the first threshold value.
Claims19
A method of detecting power of an active touch medium, the method comprising:
- capturing an image with an optical signal outputted from the active touch medium;
- reading a first threshold value;
- comparing an intensity of the optical signal and the first threshold value;
- executing a low power mode to decrease a second threshold value when the intensity of the optical signal is substantially smaller than the first threshold value;
- reading the second threshold value;
- comparing the intensity of the optical signal and the second threshold value;
- determining an imaging region of the optical signal on the image;
- and
- calculating coordinates of the active touch medium according to the imaging region of the optical signal.
6 more elements
A coordinate positioning module having power detecting function, the coordinate positioning module comprising:
- an image detecting component for capturing an image with an optical signal outputted from an active touch medium;
- and
- a processor electrically connected to the image detecting component, the processor comparing an intensity of the optical signal and a first threshold value, and executing a low power mode when the intensity of the optical signal is substantially smaller than the first threshold value, the processor further comparing the intensity of the optical signal with a second threshold value, determining an imaging region on the image by a comparing result of the intensity of the optical signal and the second threshold value, and calculating coordinates of the active touch medium according to the imaging region of the optical signal, wherein the intensity of the optical signal comprises a plurality of intensity magnitudes, each intensity magnitude of the optical signal represents a weight of corresponding column in the image.
An optical touch system comprising:
- a panel;
- an active touch medium for outputting an optical signal, the active touch medium being movably disposed on a surface of the panel;
- and
- a coordinate positioning module comprising:
- an image detecting component for capturing the optical signal projected on the panel to form an image;
- and
- a processor electrically connected to the image detecting component, the processor comparing an intensity of the optical signal and a first threshold value, and executing a low power mode mod when the intensity of the optical signal is substantially smaller than the first threshold value, the processor further comparing the intensity of the optical signal with a second threshold value, determining an imaging region on the image by a comparing result of the intensity of the optical signal and the second threshold value, and calculating coordinates of the active touch medium on the panel according to the imaging region of the optical signal.
4 more elements
A method of detecting power of an active touch medium, the method comprising:
- capturing an image with an optical signal outputted from the active touch medium;
- reading a first threshold value;
- comparing an intensity of the optical signal and the first threshold value;
- executing a low power mode when the intensity of the optical signal is substantially smaller than the first threshold value;
- and
- decreasing the first threshold value to delay actuating time of the low power mode.
3 more elements
A coordinate positioning module having power detecting function, the coordinate positioning module comprising:
- an image detecting component for capturing an image with an optical signal outputted from an active touch medium;
- and
- a processor electrically connected to the image detecting component, the processor comparing an intensity of the optical signal and a first threshold value, and executing a low power mode mod when the intensity of the optical signal is substantially smaller than the first threshold value, the processor further comparing the intensity of the optical signal with a second threshold value, determining an imaging region on the image by a comparing result of the intensity of the optical signal and the second threshold value, and calculating coordinates of the active touch medium according to the imaging region of the optical signal, wherein the second threshold value comprises a plurality of threshold magnitudes and the threshold magnitudes respectively correspond to weight thresholds of columns in the image.
Dependencies are inferred from the claim text.