Touch screen overlay with improved conductor durability
First Claim
1. A touch screen overlay for detection of both finger touch and stylus on the viewing surface of a visual display device comprising:
- a first flexible substrate of transparent insulative material one surface adapted for attachment to the viewing surface of said visual display device;
a first set of transparent conductors formed in a parallel array on a second surface of said first flexible substrate, said second surface and the conductors thereon facing away from the viewing surface of said visual display device;
a second flexible substrate of transparent insulative material disposed at one surface thereof adjacent to the second surface of said first flexible substrate;
a second set of transparent conductors formed in a parallel array on a second surface of said second flexible substrate, said second set of transparent conductors also facing away from the viewing surface of said visual display device and having an orientation perpendicular to the first set of transparent conductors so that both sets form a grid-like pattern when superimposed, separated by at least the thickness of said second flexible substrate which is both thin enough to assure that signal strength of the transparent conductors is sufficient for detection of finger touch and yet thick enough to withstand the forces exerted by the stylus; and
coating means disposed adjacent to the second surface of said second flexible substrate, said coating means also facing a user and serving as the overlay surface for interactive input by both finger touch and stylus detection means;
whereby when said coating means is contacted by either finger touch or a stylus detection means, the transparent conductors of both said first and second sets located below the area of contact will be subjected to substantially only compression forces due to any downward deflection on the overlay caused by said contact.
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Accused Products
Abstract
A touch screen overlay for use on the viewing surface of a visual display device formed from a flexible membrane laminate having improved conductor durability. The flexible laminate comprises first and second flexible substrates formed of transparent polyester material. An array of parallel transparent conductors is deposited on a surface of each flexible substrate. The two flexible substrates are joined together by an adhesive sheet of polyester material. The substrates are joined so that transparent conductors are deposited on the surface of each flexible substrate which faces away from the viewing surface when the overlay is attached to the visual display device. The two arrays, when so superimposed, form a grid-like pattern, separated by the thickness of the upper one of the flexible substrates and the adhesive sheet. A third flexible substrate also formed of polyester material covers the surface of the upper one of the other flexible substrates carrying the upper array of parallel conductors. The second and third flexible substrates are also joined by an adhesive sheet of polyester material. When the overlay is contacted either by finger touch or by a stylus, the transparent conductors located in the laminated below the contact area will subjected substantially only to compression forces.
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Citations
14 Claims
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1. A touch screen overlay for detection of both finger touch and stylus on the viewing surface of a visual display device comprising:
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a first flexible substrate of transparent insulative material one surface adapted for attachment to the viewing surface of said visual display device; a first set of transparent conductors formed in a parallel array on a second surface of said first flexible substrate, said second surface and the conductors thereon facing away from the viewing surface of said visual display device; a second flexible substrate of transparent insulative material disposed at one surface thereof adjacent to the second surface of said first flexible substrate; a second set of transparent conductors formed in a parallel array on a second surface of said second flexible substrate, said second set of transparent conductors also facing away from the viewing surface of said visual display device and having an orientation perpendicular to the first set of transparent conductors so that both sets form a grid-like pattern when superimposed, separated by at least the thickness of said second flexible substrate which is both thin enough to assure that signal strength of the transparent conductors is sufficient for detection of finger touch and yet thick enough to withstand the forces exerted by the stylus; and coating means disposed adjacent to the second surface of said second flexible substrate, said coating means also facing a user and serving as the overlay surface for interactive input by both finger touch and stylus detection means; whereby when said coating means is contacted by either finger touch or a stylus detection means, the transparent conductors of both said first and second sets located below the area of contact will be subjected to substantially only compression forces due to any downward deflection on the overlay caused by said contact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification