Patent ID: 8896545

Claim:
A display system configured for multi-touch input, the display system comprising: a display screen including a display surface and a reflection emission surface opposite the display surface; a local light source to illuminate the display screen with one or more wavelengths of infrared light; and an image-producing display panel comprising a plurality of sensor pixels positioned within a sensor layer of the image-producing display panel, and an angularly-selective layer positioned between the reflection emission surface and the sensor layer, the reflection emission surface configured to emit infrared light reflected from a touch at the display surface toward the angularly-selective layer, the angularly-selective layer configured to transmit a greater portion of infrared light having a first range of incidence angles with respect to a surface normal of the angularly-selective layer to a first sensor pixel of the sensor layer and to reflect a lesser portion of the infrared light having the first range of incidence angles, and to reflect a greater portion of infrared light having a second range of incidence angles in a direction away from a second sensor pixel of the sensor layer and to transmit a lesser portion of the infrared light having the second range of incidence angles, the second range of incidence angles being greater than the first range of incidence angles with respect to a surface normal of the sensor layer.