Patent ID: 8345002

Claim:
A control apparatus for controlling an image display, comprising: a first light source having a plurality of first point lights arranged to form a first shape for generating a predetermined spectrum signal; a second light source having a plurality of second point lights arranged to form a second shape for generating a predetermined spectrum signal; a modulation unit for simultaneously modulating the first point lights of the first light source with a first predetermined modulation frequency and for simultaneously modulating the second point lights of the second light source with a second predetermined modulation frequency to generate a modulated predetermined spectrum signal; and a remote controller, comprising: an image sensor for receiving the modulated predetermined spectrum signal at an image sampling frequency, which is an integer times of the first predetermined modulation frequency and the second predetermined modulation frequency, and generating a digital signal; and means for receiving the digital signal, identifying the first light source based on the first shape arranged by the first point lights and the second light source based on the second shape arranged by the second point lights, determining a rotation of the remote controller according to the first and second light sources identified, and identifying whether sampled images of the first and second light sources in the digital signal match the first predetermined modulation frequency and the second predetermined modulation frequency so as to eliminate interference from a light source which generates a light band overlapping at least a part of the band of the predetermined spectrum signal.