Patent ID: 8508507

Claim:
A method for identifying multiple optical inputs to a display area with embedded photo sensors, the method comprising: providing a display area with embedded photo sensors configured to display visual information; receiving a first input optically transmitted to a first location on the display area; receiving a second input optically transmitted to a second location on the display area; processing the first and second inputs to identify a timing of the first and second inputs; and determining whether the first and second inputs originated from a single source or multiple sources based on at least one estimated trace of at least one of the first and second inputs; and providing first input information and second input information each containing at least one of (1) the location of the respective input relative to the display area; and (2) the timing of the respective input, wherein determining whether the first and second inputs originated from a single source or multiple sources based on at least one estimated trace comprises: determining a first source from which the first input originated; receiving a first plurality of historical inputs from the first source, wherein the historical inputs precede the first input in time; computing a first trace of inputs based on the first input and at least one of the first plurality of historical inputs; and determining, based on the first trace of inputs, whether the second input originated from the first source.