Patent ID: 8717443

Claim:
A method of determining a camera-to-display latency of an electronic device having a camera and a touch-sensitive display, the method comprising: receiving first light at the camera; receiving second light at a first photosensitive structural portion essentially simultaneously as the receiving first light at the camera, the first photosensitive structural portion being adjacent a first portion of the touch-sensitive display; detecting a first simulated touch input at a first time at the first portion of the touch-sensitive display in response to a first actuation of the first photosensitive structural portion occurring as a result of the receiving second light; receiving third light at a second photosensitive structural portion, the second photosensitive structural portion being adjacent a second portion of the touch-sensitive display, and the third light being generated by an optical display portion of the touch-sensitive display in a manner that is based at least indirectly upon the first light received at the camera; detecting a second simulated touch input at a second time at the second portion of the touch-sensitive display in response to a second actuation of the second photosensitive structural portion occurring as a result of the receiving third light; and determining the camera-to-display latency based at least indirectly upon a difference in the first time and the second time.