Patent ID: 8847924
Filing Date: 2014-09-30
Classification: G06F

Abstract:
1. A touch screen apparatus, comprising: a material having a first end, a second end opposite the first end, a first region having a uniform thickness and including the first end, a second region having a varying thickness and including the second end, and a surface between the first end and the second end for contact by an object; an end imaging light source to direct light into the first region at the first end, reflect the light off internal surfaces of the material within the first region and the second region including the surface, and to cause the light to exit the second region at the second end; a backlight imaging light source to direct light through the second region without reflection off the internal surfaces of the material within the second region and form an image on the surface of the material in the second region; and a sensor to detect disruption of the light at the second end.