Capacitive Touch Screen
First Claim
Patent Images
1. A capacitive touch screen comprising:
- a first plurality of conductive traces formed on a first glass surface;
a plurality of capacitive sense lines between the first plurality of conductive traces;
an optically matched insulating layer of silicone dioxide formed over the first plurality of conductive traces with a plurality of openings that expose ends of the plurality of capacitive sense lines; and
a conductive layer over the insulating layer that connects to the ends of the plurality of capacitive sense lines through the plurality of openings.
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Accused Products
Abstract
A capacitive touch screen has fewer manufacturing steps to reduce the cost of manufacture. The touch screen has ITO conductor traces that are resistance matched to maintain the accuracy of the touch screen while reducing the cost of manufacture. In addition, offset pattern printing is used to apply an optically matched insulative coating over the conductive traces to eliminate the need for other process steps to connect the conductive traces for the capacitive sense lines.
33 Citations
17 Claims
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1. A capacitive touch screen comprising:
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a first plurality of conductive traces formed on a first glass surface; a plurality of capacitive sense lines between the first plurality of conductive traces; an optically matched insulating layer of silicone dioxide formed over the first plurality of conductive traces with a plurality of openings that expose ends of the plurality of capacitive sense lines; and a conductive layer over the insulating layer that connects to the ends of the plurality of capacitive sense lines through the plurality of openings. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A capacitive touch screen comprising:
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a plurality of conductive traces formed on a piece of glass terminating at a cable connection area, wherein the plurality of conductive traces have a first section and a second section, where the second section is perpendicular to the first section and connects the first section to a cable connection area, wherein the plurality of conductive traces have different trace widths in the second section such that the second plurality of conductive traces have a matched electrical resistance; and wherein the first section is inside the viewing area of the touch screen the second section of the plurality of conductive traces is outside a viewing area of the touch screen. - View Dependent Claims (9)
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10. A method for manufacturing a touch screen, the method comprising the steps of:
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a. forming a first plurality of conductive traces and a plurality of capacitive sense lines between the first plurality of conductive traces on a first glass surface; b. offset printing an insulating layer of SiO2 over the first plurality of conductive traces with a plurality of openings that expose ends of the plurality of capacitive sense lines; c. screen printing a conductive silver ink layer over the insulating layer that connects to the ends of the plurality of capacitive sense lines through the plurality of openings; d. curing the silver ink layer; and e. bonding a connector cable to the ITO traces on the glass. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification