Patent ID: 8259240
Filing Date: 2012-09-04
Classification: G06F,Y10S

Abstract:
1. A multi-touch sensing system, comprising: an optical waveguide having first and second sides; a compliant layer directly coupled to the first side of the optical waveguide, the compliant layer and the optical waveguide having substantially similar indexes of refraction so that light of at least one wavelength received by the optical waveguide in a predetermined direction undergoes total internal reflection within the optical waveguide and the compliant layer; a cladding layer directly coupled to the compliant layer and having an index of refraction sufficiently lower than the index of refraction of the compliant layer so that deformation of the cladding layer causes some of the light undergoing total internal reflection to scatter and to escape the compliant layer and the optical waveguide; and an image sensor adapted to detect at least some of the light that escapes the compliant layer and the optical waveguide.