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Flexible touch sensor with fine pitch interconnect

  • US 9,642,243 B2
  • Filed: 09/27/2012
  • Issued: 05/02/2017
  • Est. Priority Date: 09/30/2011
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • providing a multilayer structure having two opposing sides and comprising a central polymeric UV transparent substrate having two major opposing surfaces, a transparent conductive layer on each of the two major opposing surfaces of the polymeric substrate, and a metallic conductive layer on each transparent conductive layer;

    applying and patterning first photoimaging layers on both metallic conductive layers to form first masks having desired patterns for the transparent conductive layers;

    etching portions of the metallic conductive layers and transparent conductive layers exposed by the first masks such that remaining portions of the transparent conductive layers have the desired patterns for the transparent conductive layers and remaining portions of the metallic conductive layers have the desired patterns for the transparent conductive layers which are different from desired patterns for the metallic conductive layers;

    removing the first masks;

    applying and patterning second photoimaging layers over the remaining portions of each metallic conductive layer to form second masks having the desired patterns for the metallic conductive layers; and

    etching portions of the metallic conductive layers exposed by the second masks using an etchant that selectively etches the metallic conductive layers thereby forming the desired patterns for the metallic conductive layers in the metallic conductive layers, the desired patterns for the metallic conductive layers comprising conductive traces positioned at a pitch in a range of 60 micrometers to 200 micrometers.

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