Touch screen devices employing nanostructure networks
First Claim
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1. A multilayer device, comprising:
- a spacer layer on a first transparent substrate;
a first transparent conductive layer between the spacer layer and the first transparent substrate, the first transparent conductive layer including a network of nanostructures directly contacting the spacer layer and the first transparent substrate; and
at least two circuits, whereinthe first transparent conductive layer stores an electric charge, andthe circuits detect changes in capacitance across the first transparent conductive layer when the first transparent conductive layer is directly contacted by an external capacitance field.
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Abstract
Touch screen displays comprising at least one nanostructure-film, and fabrication methods thereof, are discussed. Nanostructure-films may comprise, for example, a network(s) of nanotubes, nanowires, nanoparticles and/or graphene flakes. Such films are preferably at least semi-transparent and relatively flexible, making them well-suited for use in a variety of touch screen applications.
14 Citations
19 Claims
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1. A multilayer device, comprising:
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a spacer layer on a first transparent substrate; a first transparent conductive layer between the spacer layer and the first transparent substrate, the first transparent conductive layer including a network of nanostructures directly contacting the spacer layer and the first transparent substrate; and at least two circuits, wherein the first transparent conductive layer stores an electric charge, and the circuits detect changes in capacitance across the first transparent conductive layer when the first transparent conductive layer is directly contacted by an external capacitance field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of fabricating a multi-layer device, comprising:
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depositing a first conductive layer on a first substrate, depositing a second conductive layer on a second substrate; and affixing the first substrate to the second substrate such that the first conductive layer faces the second conductive layer, wherein the first conductive layer is deposited by a multi-step spraying and washing process, comprising, spraying nanostructures in solution onto the first substrate; washing the first substrate after spraying, and repeating the spraying and washing until a nanostructure-film of desired thickness is achieved, wherein the first substrate is heated during the spraying process, wherein a spacer layer prevents contact between the first and second conductive layers in the absence of external deformation, wherein at least one of the first and second substrates is flexible, wherein the first conductive layer comprises a first network of nanostructures, and wherein the first network of nanostructures directly contacts the spacer layer and the first substrate. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A touch screen comprising:
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a first network of substantially single-walled carbon nanotubes (SWNTs) deposited directly on a first substrate, wherein both the first network of SWNTs and the first substrate are transparent and the first network of substantially single-walled carbon nanotubes (SWNTs) are configured to directly contact a spacer layer; a second network of substantially SWNTs deposited on a second substrate, wherein the first and second networks of substantially SWNTs face each other and are separated by the spacer layer, wherein the spacer layer prevents contact between the first and second networks of substantially SWNTs in the absence of external deformation, wherein at least one of the first and second substrates is flexible, wherein the first network of substantially single-walled carbon nanotubes (SWNTs) directly contacts the spacer layer, wherein at least one of the first and second networks of substantially SWNTs has a sheet resistance of less than 500 ohm/sq and a transmittance of at least 90% for 550 nm wavelength light, and wherein capacitance across the first network of substantially single-walled carbon nanotubes is changed when the first network of substantially single-walled carbon nanotubes is directly contacted by an external capacitance field. - View Dependent Claims (18, 19)
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Specification