Temperature compensating transparent force sensor having a compliant layer
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A technology of force sensor and flexible layer, applied in the field of force sensing
Active Publication Date: 2015-08-26
APPLE INC
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Furthermore, if the force sensor is incorporated into a display or transparent medium, achieving both sensing performance and optical performance in a compact form factor will be a challenge
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[0043] Embodiments described herein may involve or take the form of a force sensor that is combined with components of an electronic device to form a touch-sensitive surface on the device. Certain embodiments relate to force sensors that can compensate for changes in temperature and that can be optically transparent for integration with displays or transparent media of electronic devices. Certain embodiments described herein also relate to force-sensitive structures that include one or more force-sensitive components for detecting the magnitude of force applied to a device. In one example, the transparent force sensitive component is integrated into or adjacent to a display element of an electronic device. The electronic device may be, for example, a mobile phone, a tablet computing device, a computer monitor, a notebook computing device, a desktop computing device, a computing input device (such as a touchpad, keyboard, or mouse), a wearable device, a health monitoring device...
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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.
Description
[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Patent Application No. 61 / 926,905, filed January 13, 2014, entitled "Force Transducer Employing a Transparent Force-Sensitive Membrane," and filed February 7, 2014, entitled "Temperature Compensated U.S. Provisional Patent Application No. 61 / 937,465, filed February 12, 2014, and U.S. Provisional Patent Application No. 61 / 939,257, entitled "Temperature Compensated Transparent Force Sensor," filed February 19, 2014 U.S. Provisional Patent Application No. 61 / 942,021, entitled "Multilayer Temperature Compensated Transparent Force Sensor," filed on July 15, 2014, and entitled "Strain-Based Transparent Force Sensor" The priority of No. 62 / 024,566, the disclosure of each is incorporated by reference in its entirety. technical field [0003] Embodiments described herein relate generally to force sensing, and more specifically to temperature compensated force sensors having two or more tr...
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