Patent ID: 9019238
Filing Date: 2015-04-28
Classification: G06F

Abstract:
1. An object-sensing display device comprising: a waveguide that transmits radiation via total internal reflection; a substrate for a display panel; a liquid crystal layer, the liquid crystal layer held between the substrate and the waveguide; a radiation emitting element positioned along a radiation input surface of the waveguide; a radiation receiving element positioned to receive radiation exiting the waveguide, and a computer receiving signals from the radiation receiving element to determine a position of the object on the waveguide, wherein the substrate and the waveguide do not have an intervening substrate for the display panel between them, and wherein the computer obtains data regarding intensity of radiation at various points along an x-direction, determines a y-coordinate of the object using a rate of intensity change in the x-direction, and determines an x-coordinate of the object, the x-coordinate of the object being a point in which the obtained intensity data have a point of inflection.