Temperature compensating transparent force sensor
First Claim
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1. A transparent force sensor for detecting a force on a surface of a device, the transparent force sensor comprising:
- a first transparent force-sensitive component having a first temperature-dependent response and a first strain-dependent response;
a second transparent force-sensitive component having a second temperature-dependent response and a second strain-dependent response;
a sensor circuit operatively coupled to the first and second transparent force-sensitive components, configured to detect a change in an electrical property of the first and second transparent force-sensitive components, and output a force estimate that compensates for a variation in temperature using the first and second temperature-dependent responses of the first and second transparent force-sensitive components;
whereina strain ratio between the first strain-dependent response and the second strain-dependent response is different than a temperature ratio between the first temperature-dependent response and the second temperature-dependent response.
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Abstract
An optically transparent force sensor, which may be used as input to an electronic device. The optically transparent force sensor may be configured to compensate for variations in temperature using two or more force-sensitive components that are formed from materials having different temperature- and strain-dependent responses.
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Citations
18 Claims
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1. A transparent force sensor for detecting a force on a surface of a device, the transparent force sensor comprising:
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a first transparent force-sensitive component having a first temperature-dependent response and a first strain-dependent response; a second transparent force-sensitive component having a second temperature-dependent response and a second strain-dependent response; a sensor circuit operatively coupled to the first and second transparent force-sensitive components, configured to detect a change in an electrical property of the first and second transparent force-sensitive components, and output a force estimate that compensates for a variation in temperature using the first and second temperature-dependent responses of the first and second transparent force-sensitive components;
whereina strain ratio between the first strain-dependent response and the second strain-dependent response is different than a temperature ratio between the first temperature-dependent response and the second temperature-dependent response. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electronic device having a transparent force sensor, the device comprising:
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an enclosure; a display disposed within the enclosure; a cover disposed above the display and forming a portion of an outer surface or the device; a first array of transparent force-sensitive components disposed below the cover and having a first temperature-dependent response and a first strain-dependent response; a second array of transparent force-sensitive components disposed below the first array and having a second temperature-dependent response and a second strain-dependent response; a sensor circuit operatively coupled to the first and second array, configured to detect a change in an electrical property of components of the first and second arrays, and output a force estimate that compensates for a variation in temperature using the first and second temperature-dependent responses of the first and second transparent force-sensitive components;
whereina strain ratio between the first and second strain-dependent responses is different than a temperature ratio between the first and second temperature-dependent responses. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An electronic device having a transparent force sensor, the device comprising:
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an enclosure; a display disposed within the enclosure; a cover disposed above the display and forming a portion of an outer surface or the device; a first array of transparent force-sensitive components disposed below the cover and including components having a first and second temperature-dependent response and a first and second strain-dependent response, respectively; a second array of transparent force-sensitive components disposed below the first array and including components having the first and second temperature-dependent response and the first and second strain-dependent response, respectively; and a sensor circuit operatively coupled to the first and second array, configured to detect a change in an electrical property of components, and output a force estimate that compensates for a variation in temperature using the first and second temperature-dependent responses;
whereina strain ratio between the first and second strain-dependent responses is different than a temperature ratio between the first and second temperature-dependent responses. - View Dependent Claims (14, 15)
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16. A transparent force sensor for detecting a force on a surface of a device, the transparent force sensor comprising:
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a transparent force-sensitive component including an array of pixel elements; a primary pixel of the array of pixel elements; at least one reference pixel of the array of pixel elements, wherein the at least on reference pixel is separated from the primary pixel by at least one other pixel element; a sensor circuit configured to form an electrical bridge circuit across the primary pixel and the at least one reference pixel to detect a change in resistance of the primary pixel. - View Dependent Claims (17, 18)
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Specification