Compact optical pointing apparatus and method
First Claim
1. A mobile device comprising:
- a display;
a fingerprint sensing circuit mounted within a depressible key; and
a fingerprint movement detection circuit, operatively coupled to the fingerprint sensing circuit and to the display, and operative to determine a direction of movement independent of depression of the depressible key and a rate of movement, of skin texture being sensed by the fingerprint sensing circuit and to produce pointing output data for the display;
wherein the fingerprint movement detection circuit determines at least one of a rate and a direction of movement of the skin texture by;
modifying at least one of the previously stored images to produce a plurality of candidate displacement images each with an associated respective displacement movement vector;
and compares by correlating the resolved first image against each of the plurality of candidate displacement images to produce a plurality of respectively associated displacement correlation scores;
and wherein determining at least one of a rate and a direction of movement further includes;
choosing the highest displacement correlation score and providing the associated respective displacement movement vector to determine the direction of movement of the skin texture.
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Accused Products
Abstract
A display pointing device (10) includes a fingerprint sensing circuit (18) that optically senses, for example, a portion of a fingerprint or other skin texture, and a fingerprint movement detection circuit (20), operatively coupled to the fingerprint sensing circuit (18), that is operative to determine a direction of movement and a rate of movement of skin texture being sensed by the fingerprint sensing circuit (18) to produce pointing output data (24) for a display (12). The pointing output data (24) may be, for example, data representing a visual indication of a position on a display screen, such as a position of a cursor or of highlighted text, or any other suitable position indication. A method for providing pointing information for display includes sensing a fingerprint, determining a direction of movement and a rate of movement of the fingerprint and producing a pointing output for display based on a determined direction of movement and rate of movement of the sensed fingerprint.
26 Citations
20 Claims
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1. A mobile device comprising:
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a display; a fingerprint sensing circuit mounted within a depressible key; and a fingerprint movement detection circuit, operatively coupled to the fingerprint sensing circuit and to the display, and operative to determine a direction of movement independent of depression of the depressible key and a rate of movement, of skin texture being sensed by the fingerprint sensing circuit and to produce pointing output data for the display; wherein the fingerprint movement detection circuit determines at least one of a rate and a direction of movement of the skin texture by; modifying at least one of the previously stored images to produce a plurality of candidate displacement images each with an associated respective displacement movement vector; and compares by correlating the resolved first image against each of the plurality of candidate displacement images to produce a plurality of respectively associated displacement correlation scores; and wherein determining at least one of a rate and a direction of movement further includes; choosing the highest displacement correlation score and providing the associated respective displacement movement vector to determine the direction of movement of the skin texture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A mobile device comprising:
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a display; a depressible multi-function key, comprising a sensing window co-located on the depressible key, the sensing window being part of a surface texture sensing circuit; and a surface texture movement detection circuit, operatively coupled to the surface texture sensing circuit and operative to determine direction of movement independent of depression of the depressible key, and operative to determine rate of movement of a texture over the sensing window and to produce pointing output data for the display and wherein the depressible key also functions as a non-pointing device based key. - View Dependent Claims (20)
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Specification