Transparent force sensor and method of fabrication
First Claim
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1. A method of fabricating a force sensing sensor comprising:
- forming a transparent polymer matrix including a plurality of transparent conducting nanoparticles, wherein forming the transparent polymer matrix comprises;
dispersing the plurality of transparent conducting nanoparticles in a first solvent system,dispersing a transparent polymer in a second solvent system,combining the first and second solvent systems in a predetermined ratio determined by a percolation value for the combination, anddegassing the combination;
disposing on a first surface of the transparent polymer matrix a first plurality of transparent conducting oxide (TCO) electrodes, the first plurality of TCO electrodes arranged in a first direction;
disposing on a second surface of the transparent polymer matrix opposing the first surface a second plurality of TCO electrodes, the second plurality of TCO electrodes arranged in a second direction overlaying the first direction, andproviding, by the transparent conducting nanoparticles at the cross section, a conducting path from the at least one of the first plurality of TCO electrodes to the at least one of the second plurality of electrodes, wherein, upon a force being applied at a cross section of at least one of the first and second plurality of TCO electrodes, the force can be measured by probing resistance at the cross section.
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Abstract
A transparent force sensor for use in touch panel displays (touch screens) and method for fabricating the same are disclosed. The transparent force sensor is capable of detecting touch by measuring local pressure applied by a touch input to a display area of the touch screen.
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Citations
9 Claims
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1. A method of fabricating a force sensing sensor comprising:
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forming a transparent polymer matrix including a plurality of transparent conducting nanoparticles, wherein forming the transparent polymer matrix comprises; dispersing the plurality of transparent conducting nanoparticles in a first solvent system, dispersing a transparent polymer in a second solvent system, combining the first and second solvent systems in a predetermined ratio determined by a percolation value for the combination, and degassing the combination; disposing on a first surface of the transparent polymer matrix a first plurality of transparent conducting oxide (TCO) electrodes, the first plurality of TCO electrodes arranged in a first direction; disposing on a second surface of the transparent polymer matrix opposing the first surface a second plurality of TCO electrodes, the second plurality of TCO electrodes arranged in a second direction overlaying the first direction, and providing, by the transparent conducting nanoparticles at the cross section, a conducting path from the at least one of the first plurality of TCO electrodes to the at least one of the second plurality of electrodes, wherein, upon a force being applied at a cross section of at least one of the first and second plurality of TCO electrodes, the force can be measured by probing resistance at the cross section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification