Piezo Based Force Sensing
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Abstract
Systems for detecting an amount and/or location of a force applied to a device using a piezoelectric film are provided. One example system can include a transparent piezoelectric film for generating an electric charge in response to a deformation of the film. Electrodes positioned on opposite surfaces of the piezoelectric film can be used to detect the generated electric charge and determine an amount and/or location of force applied to the film based on the generated electric charge. In another embodiment, the system can include a capacitive touch sensor for determining a location of a touch event on the device.
16 Citations
40 Claims
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1-20. -20. (canceled)
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21. A display stack, comprising:
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a cover material defining an outer surface of the display stack and configured to receive a touch input from a user; a touch input sensor substrate below the cover material; a first touch input sensor electrode disposed on a first surface of the touch input sensor substrate; a second touch input sensor electrode disposed on a second surface of the touch input sensor substrate; a light-emitting layer below the touch input sensor substrate; a force sensor layer below the light-emitting layer; a first force sensor electrode disposed on the force sensor layer; a second force sensor electrode disposed on the force sensor layer and aligned with the first force sensor electrode; and sense circuitry operable to detect an electric charge generated by the force sensor layer in response to a deformation of the force sensor layer and the light-emitting layer that results from the touch input. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A display stack, comprising:
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a touch input sensor comprising; a transparent substrate; a first touch input sensor electrode array disposed on a first surface of the transparent substrate; and a second touch input sensor electrode array disposed on a second surface of the transparent substrate opposite the first touch input sensor electrode array; an organic light-emitting diode display layer coupled to the touch input sensor; a force sensor coupled to the organic light-emitting diode display layer and comprising; a piezoelectric substrate; a first force sensor electrode array disposed on the piezoelectric substrate; and a second force sensor electrode array disposed on the piezoelectric substrate adjacent to the first force sensor electrode array; and sense circuitry operable to detect an electric charge generated by the force sensor in response to a deformation of the light-emitting layer that results from a touch input to the touch input sensor. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A display stack, comprising:
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a transparent outer cover; a light-emitting layer below the transparent outer cover; and a force sensor adhered to the light-emitting layer and comprising; a first force-sensing film; a first force sensor electrode array disposed on a first surface of the first force-sensing film; a shared electrode disposed on a second surface of the first force-sensing film, the second surface opposite the first surface; a second force-sensing film coupled to the shared electrode; and a second force sensor electrode array disposed on the second force-sensing film opposite the shared ground electrode. - View Dependent Claims (37, 38, 39, 40)
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Specification