Patent ID: 8238013
Filing Date: 2012-08-07
Classification: G02B,G03B,G09G,H04N

Abstract:
1. A projection apparatus comprising a micromirror device for reflecting and modulating a light emitted from a light source to project an image on a display screen, the projection apparatus further comprising: a projection optical system comprising an adjustable aperture for adjusting an aperture ratio to control an amount of output light reflected from said micromirror device to said image display screen; a controller to control the micromirror device including a plurality of micromirrors to operate in a first state, a second state and a third state as an intermediate state oscillating between the first state and the second state; said controller further controls and changes the aperture ratio of the projection optical system in a first control time period when at least one of the micromirrors is controlled to operate in the first state and/or a second control time period when at least one of the micromirrors is controlled to operate in the third state; and the controller further controls and changes the aperture ratio of the projection optical system in one or more of a plurality of divisional control time periods by further dividing the first control time period and/or the second control time period.