Temperature compensating transparent force sensor having a compliant layer
First Claim
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1. An electronic device having an optically transparent force sensor comprising:
- a first transparent substrate;
a first force-sensitive layer disposed relative to the first transparent substrate;
a second transparent substrate disposed below the first transparent substrate;
a second force-sensitive layer disposed relative to the second transparent substrate; and
a compliant layer disposed between the first and second transparent substrates; and
sensor circuitry that is configured to compare a relative electrical response between the first force-sensitive layer and the second force-sensitive layer to compute a temperature-compensated force estimate, and to compensate for variations in temperature of the electronic device using the temperature-compensated force estimate.
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Abstract
An optically transparent force sensor that may compensate for environmental effects, including, for example, variations in temperature of the device or the surroundings. In some examples, two force-sensitive layers are separated by a compliant layer. The relative electrical response of the two force-sensitive layers may be used to compute an estimate of the force of a touch that reduces the effect of variations in temperature. In some examples, piezoelectric films having anisotropic strain properties are used to reduce the effects of temperature.
41 Citations
22 Claims
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1. An electronic device having an optically transparent force sensor comprising:
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a first transparent substrate; a first force-sensitive layer disposed relative to the first transparent substrate; a second transparent substrate disposed below the first transparent substrate; a second force-sensitive layer disposed relative to the second transparent substrate; and a compliant layer disposed between the first and second transparent substrates; and sensor circuitry that is configured to compare a relative electrical response between the first force-sensitive layer and the second force-sensitive layer to compute a temperature-compensated force estimate, and to compensate for variations in temperature of the electronic device using the temperature-compensated force estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An electronic device having an optically transparent force sensor, the device comprising:
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a cover; a first transparent substrate disposed below the cover; a first array of force-sensitive components disposed relative to the first transparent substrate; a second transparent substrate disposed below the first transparent substrate; a second array of force-sensitive components disposed relative to the second transparent substrate; and a compliant layer disposed between the first and the second transparent substrates; and sensor circuitry that is configured to compare a relative electrical response between components of the first array of force-sensitive components and the second array of force-sensitive components to compute a temperature-compensated force estimate, and to compensate for variations in temperature of the electronic device using the temperature-compensated force estimate. - View Dependent Claims (16, 17, 18)
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19. An electronic device having an optically transparent force sensor comprising:
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a first transparent substrate; a first force-sensitive layer disposed relative to the first transparent substrate; a second transparent substrate disposed below the first transparent substrate; a second force-sensitive layer disposed relative to the second transparent substrate; and sensor circuitry that is configured to detect a voltage between the first force-sensitive layer and the second force-sensitive layer to compute a temperature-compensated force estimate, and to compensate for variations in temperature of the electronic device using the temperature-compensated force estimate, wherein the first force-sensitive layer is formed from an anisotropic piezoelectric film, and the second force-sensitive layer is formed from an isotropic piezoelectric film. - View Dependent Claims (20, 21, 22)
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Specification