OPTICAL FINGER NAVIGATION MODULE FOR EXTREME TEMPERATURE OPERATION AND METHOD FOR INCREASING LIFE TIME OF OFN MODULE
First Claim
1. An optical finger navigation module for extreme temperature operation, the module comprising:
- (a) a housing comprising a top window plate and a bottom electrical substrate;
(b) a light source mounted below the top window plate;
(c) a transmitter driver for outputting a current to the light source;
(d) a photodetector and a digital signal processor for capturing and processing light signals from the light source respectively;
(e) a temperature sensor mounted on the bottom electrical substrate for sensing an ambient temperature and providing a temperature signal;
(f) a sensor integrated circuit comprising a main processor coupled with the temperature sensor for reading the temperature signal and generating a compensated current that corresponds to the temperature signal based on a compensation curve tailor-made for the light source and derived from a temperature compensation algorithm using a plurality of compensation factors;
(g) a memory coupled with the main processor for storing the compensation factors; and
(h) a capacitance sensing circuit for sensing a tracking object on top of the window plate.
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Accused Products
Abstract
An optical finger navigation module includes a light source mounted below a window plate formed on a housing of the module, a driver for outputting a current to the light source, an environmental sensor for sensing an environmental condition and providing a signal, and a sensor integrated circuit including a processor coupled with the environmental sensor for reading the signal and generating a compensated current that corresponds to the signal based on a compensation curve tailor-made for the light source and derived from a compensation algorithm using compensation factors. A method for increasing lifetime of the module is also disclosed.
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Citations
23 Claims
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1. An optical finger navigation module for extreme temperature operation, the module comprising:
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(a) a housing comprising a top window plate and a bottom electrical substrate; (b) a light source mounted below the top window plate; (c) a transmitter driver for outputting a current to the light source; (d) a photodetector and a digital signal processor for capturing and processing light signals from the light source respectively; (e) a temperature sensor mounted on the bottom electrical substrate for sensing an ambient temperature and providing a temperature signal; (f) a sensor integrated circuit comprising a main processor coupled with the temperature sensor for reading the temperature signal and generating a compensated current that corresponds to the temperature signal based on a compensation curve tailor-made for the light source and derived from a temperature compensation algorithm using a plurality of compensation factors; (g) a memory coupled with the main processor for storing the compensation factors; and (h) a capacitance sensing circuit for sensing a tracking object on top of the window plate.
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2. An optical finger navigation module comprising:
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(a) a light source mounted below a window plate formed on a housing of the module; (b) a transmitter driver for outputting a current to the light source; (c) an environmental sensor mounted inside the housing for sensing an environmental condition and providing a signal representing the environmental condition; and (d) a sensor integrated circuit comprising a main processor coupled with the environmental sensor for reading the signal and generating a compensated current that corresponds to the signal based on a compensation curve tailor-made for the light source and derived from a compensation algorithm using a plurality of compensation factors. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for increasing life time of an optical finger navigation module by minimizing operation time of a light source and compensating for environment variation in the optical finger navigation module having a light source and a transmitter driver for outputting a current to the light source, the method comprising:
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(a) providing an environmental sensor inside a housing of the module for sensing an environmental condition; (b) reading a signal provided by the environmental sensor that represents the environmental condition; (c) generating a compensated current that corresponds to the signal based on a compensation curve tailor-made for the light source and derived from a compensation algorithm using a plurality of compensation factors; and (d) controlling the transmitter driver to output the compensated current to the light source. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification