Avoidance of bending effects in a touch sensor device
First Claim
1. An input device comprising:
- a display film stack configured to display an image thought a top surface, the display film stack comprising;
a plurality of sensor electrodes disposed in a matrix array; and
a plurality of routing traces coupled to the sensor electrodes; and
an electrically conductive shield having an areal extent approximately equal or greater than an active area of the plurality of sensor electrodes, the electrically conductive shield disposed below the matrix array and routing traces relative to the top surface;
a compressible layer disposed below the display film stack, the compressible layer configured to allow the display film stack to deflect in response to a normal force applied to the top surface of display film stack; and
a processing system coupled to the plurality of routing traces and to the electrically conductive shield, the processing system configured to operate the plurality of sensor electrodes for touch sensing and to operate the electrically conductive shield with a signal that mitigates changes in background capacitance across the plurality of sensor electrodes as the displace stack bends.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed herein include an input device, processing system and methods for touch sensing. Implementations advantageously are resistive to diminished performance when a film stack of an input device is bent in response to an input (touch) event. In one implementation, an input device is provided that includes a housing, a plurality of sensor electrodes disposed in a pattern on a substrate, a plurality of routing traces coupled to the sensor electrodes, an electrically conductive shield and a compressible layer. The electrically conductive shield has an areal extent approximately equal or greater than an areal extent of the pattern of sensor electrodes. The electrically conductive shield and the substrate are part of a display film stack disposed in the housing. The compressible layer is disposed between the display film stack and housing. The compressible layer is configured to allow the display film stack to deflect towards a bottom of the housing.
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Citations
25 Claims
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1. An input device comprising:
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a display film stack configured to display an image thought a top surface, the display film stack comprising; a plurality of sensor electrodes disposed in a matrix array; and a plurality of routing traces coupled to the sensor electrodes; and an electrically conductive shield having an areal extent approximately equal or greater than an active area of the plurality of sensor electrodes, the electrically conductive shield disposed below the matrix array and routing traces relative to the top surface; a compressible layer disposed below the display film stack, the compressible layer configured to allow the display film stack to deflect in response to a normal force applied to the top surface of display film stack; and a processing system coupled to the plurality of routing traces and to the electrically conductive shield, the processing system configured to operate the plurality of sensor electrodes for touch sensing and to operate the electrically conductive shield with a signal that mitigates changes in background capacitance across the plurality of sensor electrodes as the displace stack bends.
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2. An input device comprising:
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a plurality of sensor electrodes disposed in a matrix array, the plurality of sensor electrodes configured to provide a metric indicative of presence of an input object in a sensing region proximate the matrix array when driven with a sensing signal; a compressible layer disposed below the film stack opposite the sensing region, the compressible layer configured to allow the display film stack to deflect in response to a normal force applied to the film stack in a direction of the electrically conductive shield; a plurality of routing traces coupled to the sensor electrodes; and an electrically conductive shield having an areal extent approximately equal or greater than an active area of the plurality of sensor electrodes, the matrix array, routing traces and electrically conductive shield part of a film stack, wherein the matrix array is closer to the sensing region than the electrically conductive shield, wherein the electrically conductive shield is configured to mitigate changes in background capacitance across the plurality of sensor electrodes as the film stack bends.
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3. An input device comprising:
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a display film stack configured to display an image, the display film stack having a viewing side and a non-viewing side, the display film stack comprising; a plurality of sensor electrodes; an electrically conductive shield disposed on the non-viewing side of all of the plurality of sensor electrodes; and a plurality of routing traces coupled to the sensor electrodes, the electrically conductive shield disposed between the routing traces and the non-viewing side of the display film stack; and a compressible layer disposed between the non-viewing side of the display film stack and a grounded surface of the input device, the compressible layer configured to allow the display film stack to deflect towards the grounded surface of the input device in response to a force applied normally to the viewing side of the display film stack, and wherein the electrically conductive shield is configured to mitigate changes in background capacitance across the plurality of sensor electrodes as the film stack bends. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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12. An input device comprising:
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a housing having a bottom; a plurality of sensor electrodes disposed in a pattern on a substrate; a plurality of routing traces coupled to the sensor electrodes; an electrically conductive shield having an areal extent approximately equal or greater than an areal extent of the pattern of sensor electrodes, the electrically conductive shield and the substrate are part of a display film stack disposed in the housing, the conductive shield disposed between all of the plurality of sensor electrodes and the bottom of the housing; and a compressible layer disposed between the display film stack and housing, the compressible layer configured to allow the display film stack to deflect towards the bottom of the housing. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A processing system comprising:
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a touch control module having circuitry configured to; operate a plurality of sensor electrodes for touch sensing; and operate an electrically conductive shield disposed between all of the plurality of sensor electrodes and a grounded surface disposed on a non-viewing side of an input device with a shield signal that mitigates changes in background capacitance across the plurality of sensor electrodes as the plurality of sensor electrodes and conductive shield bend in response to an force applied to the sensor electrodes during a touch event. - View Dependent Claims (24, 25)
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Specification