US Patent No. 9,348,433

OPTICAL TOUCH SENSING STRUCTURE


Patent No. 9,348,433
Issue Date May 24, 2016
Title Optical Touch Sensing Structure
Inventorship Ming-Huei Yang, Taipei (TW)
Assignee Unimicron Technology Corp., Taoyuan (TW)

Claim of US Patent No. 9,348,433

1. An optical touch sensing structure, comprising:
a transparent substrate; and
a plurality of optical particles with metallic composition, disposed on the transparent substrate, wherein when an infrared
is incident on each of the optical particles with metallic composition, the infrared is reflected by each of the optical particles
with metallic composition;

a transparent adhesive layer, disposed on the transparent substrate, wherein a refractive index of the transparent adhesive
layer is identical or similar to a refractive index of the transparent substrate, and the optical particles with metallic
composition are fixed on the transparent substrate by the transparent adhesive layer, the transparent adhesive layer completely
covers the transparent substrate and the optical particles with metallic composition are distributed in the transparent adhesive
layer;

a plurality of light absorbing portions, disposed on the transparent adhesive layer and exposing a portion of the transparent
adhesive layer; and

a transparent protective layer, disposed on the transparent adhesive layer and covering the light absorbing portions and the
portion of the transparent adhesive layer exposed by light absorbing portions, wherein a refractive index of the transparent
protective layer is identical or similar to the refractive index of the transparent substrate and identical or similar to
the refractive index of the transparent adhesive layer.