TOUCH SENSOR WITH MULTILAYER STACK HAVING IMPROVED FLEXURAL STRENGTH
First Claim
1. A multilayer stack for use in a touch sensor and having a border area surrounding a viewing area, the viewing area adapted to face a viewer and be touch sensitive, the multilayer stack comprising:
- a base substrate covering the viewing and border areas of the multilayer stack;
an optically opaque border layer disposed in and covering the border, but not the viewing, area of the multilayer stack, the border layer defining a step proximate to and extending along a perimeter of the viewing area and having a step height of at least 5 microns;
an optically transparent adhesive layer disposed on the base substrate and the border layer and covering the viewing and border areas of the multilayer stack, a maximum height variation of a major surface of the optically transparent adhesive layer away from the viewing area in a region corresponding to the step being less than the step height;
a plurality of discrete spaced apart optically transparent electrodes disposed on the adhesive layer, each electrode extending across the step; and
a plurality of discrete spaced apart electrically conductive pads disposed in the border, but not the viewing, area of the multilayer stack, each pad being disposed on and making physical contact with a different corresponding electrode over a contact region.
1 Assignment
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Accused Products
Abstract
A multilayer stack for use in a touch sensor is provided, including a base substrate covering viewing and border areas of the multilayer stack and an optically opaque border layer that defines a step proximate to and extending along a perimeter of the viewing area. The multilayer stack also includes an optically transparent adhesive layer disposed on the base substrate and the border layer and covering the viewing and border areas of the multilayer stack. The multilayer stack further includes a number of discrete spaced apart optically transparent electrodes disposed on the adhesive layer, each electrode extending across the step, and a number of discrete spaced apart electrically conductive pads disposed in the border, but not the viewing, area of the multilayer stack, each pad being posed on and making physical contact with a different corresponding electrode over a contact region.
9 Citations
21 Claims
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1. A multilayer stack for use in a touch sensor and having a border area surrounding a viewing area, the viewing area adapted to face a viewer and be touch sensitive, the multilayer stack comprising:
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a base substrate covering the viewing and border areas of the multilayer stack; an optically opaque border layer disposed in and covering the border, but not the viewing, area of the multilayer stack, the border layer defining a step proximate to and extending along a perimeter of the viewing area and having a step height of at least 5 microns; an optically transparent adhesive layer disposed on the base substrate and the border layer and covering the viewing and border areas of the multilayer stack, a maximum height variation of a major surface of the optically transparent adhesive layer away from the viewing area in a region corresponding to the step being less than the step height; a plurality of discrete spaced apart optically transparent electrodes disposed on the adhesive layer, each electrode extending across the step; and a plurality of discrete spaced apart electrically conductive pads disposed in the border, but not the viewing, area of the multilayer stack, each pad being disposed on and making physical contact with a different corresponding electrode over a contact region. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12, 13, 14, 15, 16, 17, 18)
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7. A multilayer stack for use in a touch sensor and having a border area surrounding a viewing area, the viewing area adapted to face a viewer and be touch sensitive, the multilayer stack comprising:
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a base substrate covering the viewing and border areas of the multilayer stack; an optically opaque border layer disposed in and covering the border, but not the viewing, area of the multilayer stack, the border layer defining a step proximate to and extending along a perimeter of the viewing area and having a step height of at least 5 microns; an optically transparent adhesive layer disposed on the base substrate and the border layer and covering the viewing and border areas of the multilayer stack; a plurality of discrete spaced apart optically transparent electrodes disposed on the adhesive layer, each electrode extending across the step; and a plurality of discrete spaced apart electrically conductive pads disposed in the border, but not the viewing, area of the multilayer stack, each pad being disposed on and making physical contact with a different corresponding electrode over a contact region, wherein any void or bubble formed between the base substrate, the optically opaque border layer and the optically transparent adhesive layer at the step is substantially unresolvable by a human eye viewing the multilayer stack at a normal viewing distance. - View Dependent Claims (19)
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- 8. A touch sensor having a touch sensitive area surrounded by a border area, a vertical step separating the border area from the touch sensitive area and extending along a perimeter of the touch sensitive area, the step having a step height of at least 5 microns, an optically transparent adhesive layer disposed on and covering the touch sensitive and border areas and having a minimum thickness of at least 30 microns, an optically transparent electrode disposed on the optically transparent adhesive layer in the border area and extending across the vertical step, and an electrically conductive pad disposed on the electrode in the border area.
Specification