US Patent 7102801 Pulse-width modulated drivers for light-emitting units of scanning mechanism

A scanning mechanism of one embodiment of the invention is disclosed that includes light-emitting units, an integrating detector, and pulse-width modulated (PWM) drivers. Each light-emitting unit can emit colored light corresponding to a color of a color space. The integrating detector can detect the colored light emitted by the light-emitting units as reflected off a surface by integrating the colored light detected over a period of time. Each PWM driver can turn on a corresponding light-emitting unit at a duty cycle.