Patent ID: 9058068
Filing Date: 2015-06-16
Classification: G06F

Abstract:
1. An electronic device comprising: a display screen having an array of pixel cells; a reference photodetector configured to produce a first timing signal in response to a change in state of a reference pixel cell of the array of pixel cells; and one or more processors in communication with the display screen and the reference photodetector and configured to transmit display data to the display screen via a digital interface, the one or more processors responsive to the first timing signal and to a second timing signal from a photodetector of a stylus, the one or more processors further configured to utilize the first and second timing signals to determine a location of the stylus with respect to the display screen, wherein the one or more processors are coupled the display screen via a digital interface having a latency between when the display data is supplied by the one or more processors and when the corresponding image is rendered on the display screen, and wherein the reference photodetector is fixedly coupled to the electronic device in proximity to the reference pixel cell.