Faceplate for a touch-sensitive video display unit
First Claim
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1. A faceplate for a touch-sensitive video display comprising:
- a transparent substrate having a refractive index;
a transparent dielectric base layer deposited on a selected surface of said transparent substrate, said base layer having a thickness between about 70 and 110 nanometers and extending continuously over said selected surface;
a pattern of co-planar, adjacent transparent electrode-regions formed on said dielectric base layer, said electrode-regions having spaces therebetween, and said electrode-regions formed from a transparent conductive layer having a thickness between about 8 and 25 nm;
a transparent dielectric protective-layer covering said electrode-regions and said spaces, said dielectric protective-layer having a thickness greater than about 250 nm; and
said transparent conductive layer having a refractive index between about 1.9 and 2.2 and an extinction coefficient less than 0.1, said dielectric base layer having a refractive index greater than the refractive index of said substrate and less than the refractive index of said transparent conductive layer, and said dielectric-protective-layer having a refractive index less than the refractive index of said base layer.
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Abstract
A faceplate for a touch-sensitive display includes, on an outermost surface, a pattern of electrode-regions separated by spaces. A base-coating is deposited on the surface and extends continuously over the surface. The electrode-regions are formed from a layer of a conductive transparent metal-oxide deposited on the base-coating. The electrode-regions and spaces are overcoated by a protective-layer of an insulating material. For light incident on the faceplate at about normal incidence photopic reflectivity in the protective-layer-overcoated electrode-regions is within plus or minus ten percent of photopic reflectivity in the protective-layer-overcoated spaces.
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Citations
14 Claims
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1. A faceplate for a touch-sensitive video display comprising:
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a transparent substrate having a refractive index; a transparent dielectric base layer deposited on a selected surface of said transparent substrate, said base layer having a thickness between about 70 and 110 nanometers and extending continuously over said selected surface; a pattern of co-planar, adjacent transparent electrode-regions formed on said dielectric base layer, said electrode-regions having spaces therebetween, and said electrode-regions formed from a transparent conductive layer having a thickness between about 8 and 25 nm; a transparent dielectric protective-layer covering said electrode-regions and said spaces, said dielectric protective-layer having a thickness greater than about 250 nm; and said transparent conductive layer having a refractive index between about 1.9 and 2.2 and an extinction coefficient less than 0.1, said dielectric base layer having a refractive index greater than the refractive index of said substrate and less than the refractive index of said transparent conductive layer, and said dielectric-protective-layer having a refractive index less than the refractive index of said base layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A faceplate for a touch-sensitive video display comprising:
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a transparent substrate having a refractive index; a transparent base-coating deposited on a selected surface of said transparent substrate, said base-coating including three layers and having a thickness between about 100 and 160 nanometers and extending continuously over said selected surface; a pattern of co-planar, adjacent electrode-regions formed on said base-coating, said electrode-regions having spaces therebetween, and said electrode-regions formed from a transparent conductive layer having a thickness between about 8 and 25 nm; a transparent protective-layer covering said electrode-regions and said spaces and having a thickness greater than about 250 nm; said transparent conductive layer having a refractive index between about 1.9 and 2.2 and an extinction coefficient less than 0.1, and said protective-layer having a refractive index between about 1.35 and 1.65; said three layers of said base-coating designated the first second and third in consecutive numerical order beginning with the layer furthest from said selected surface, said first layer having a refractive index less than the refractive index of said transparent conductive layer, said second layer having a refractive index greater than the refractive index of said first layer, and said third layer having a refractive index less than the refractive index of said transparent conductive layer and greater than the refractive index of said substrate; and said three layers of said base-coating including at least one dielectric layer. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification