Optical touch detection is provided by an interactive display device including an elastomer layer, a reflector configured to transmit light having a first characteristic and to reflect light having a second characteristic, and a display positioned to output modulated light having the first characteristic through the elastomer layer and the reflector as a display image. The interactive display device further comprises a test light source positioned to output light having the second characteristic through the elastomer layer for reflection off of the reflector, and a sensor configured to receive light having the second characteristic reflected from the reflector.