Optical pointing device
2 Assignments
0 Petitions
Accused Products
Abstract
An optical pointing device includes a variable frame rate controller to reduce power consumption. Frame rate can be varied through analog devices by varying the reference current, or through digital devices by varying the length of time between successive frames. The variable frame rate controller can accept input from various measurements such as velocity of the device, or a spatial frequency of the surface on which the device is situated.
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Citations
47 Claims
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1-19. -19. (canceled)
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20. An optical pointing device comprising:
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at least one light source for illuminating a surface adjacent the optical pointing device;
a pixel array for receiving light reflected from the surface;
a frame readout circuit for reading information from said pixel array for producing a frame representing the light reflected from the surface;
a motion processor for calculating, from successive frames, motion of the optical pointing device; and
a variable frame rate controller for controlling a rate at which said frame readout circuit produces frames. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An optical pointing device comprising:
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at least one light source for illuminating a surface adjacent the optical pointing device;
a pixel array for receiving light reflected from the surface;
a frame readout circuit for reading information from said pixel array for producing a frame representing the light reflected from the surface;
a motion processor for calculating from successive frames motion of the optical pointing device;
a variable reference current generator for providing a reference current; and
a variable frame rate controller for controlling a rate at which said frame readout circuit produces frames by controlling the reference current. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for reducing power consumption in an optical pointing device comprising:
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emitting light for illuminating a surface adjacent the optical pointing device;
detecting light reflected from the surface using a pixel array;
converting the detected light into a digital signal, and storing the digital signal in a frame;
calculating motion of the optical pointing device through comparison of successive frames; and
varying a rate that frames are created. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
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Specification