Waveguide materials for optical touch screens
First Claim
1. An optical waveguide when used as a component of an optical touch screen sensor, the waveguide comprising a light guiding portion on a substantially flexible substrate, wherein the light guiding portion is composed of a polymer with Tg below an operating temperature of the optical touch screen sensor.
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Accused Products
Abstract
This invention relates to polymeric optical materials suitable for use in waveguide-based optical touch screen sensors. In particular, the materials should have a glass transition temperature (Tg) below a minimum operating temperature of the touch screen device. Preferably, waveguides composed of the materials are fabricated on polymer substrates, so that the waveguide assembly is flexible. In this case, the materials should have Tg below a Tg of the polymer substrate.
87 Citations
19 Claims
- 1. An optical waveguide when used as a component of an optical touch screen sensor, the waveguide comprising a light guiding portion on a substantially flexible substrate, wherein the light guiding portion is composed of a polymer with Tg below an operating temperature of the optical touch screen sensor.
- 18. An optical waveguide when used as a component of an optical touch screen sensor, the waveguide comprising a light guiding portion on a substantially flexible substrate, wherein the light guiding portion is composed of a polymer with Tg below an operating temperature of the optical touch screen sensor and wherein the light guiding portion is formed by depositing a substantially non-volatile curable liquid siloxane polymer onto the substrate, and curing it to form a cross-linked siloxane polymer.
Specification