Patent ID: 8462421

Claim:
A projection apparatus comprising a light source for emitting an incident light and a mirror device includes a plurality of mirror elements for reflecting the incident light to an ON direction for guiding the incident light to a projection light path or to an OFF direction away from the projection path, wherein the projection apparatus further comprising: a controller for receiving data for generating control signals to control each of the plurality of mirror elements to perform an ON operation for reflecting the incident light to an ON direction under a pulse width modulation (PWM) control within a display frame period or a sub-frame period wherein each mirror is controlled to turn to an ON direction and an OFF direction within the frame period or the subframe period and wherein one of the mirror elements as a maximum intensity mirror element projecting a maximum brightness within the frame period or the subframe period, the light source is turned off at a same time when the maximum intensity mirror element is controlled to turn to the OFF direction within the frame period or the subframe period; and the controller further converts the data into non-binary data and applies the non-binary control data to control the mirror elements.