Illuminating light source including a light intensity modulator that oscillates a light from a coherent light source in a non-integral multiple of one cycle and two- dimensional image display using the same

Abstract

In a laser display displaying a video by scanning a beam from a laser light source two-dimensionally on a screen, image quality is deteriorated markedly by speckle noises induced from coherency of the light source. A known method of oscillating the screen to remove the speckles has a problem that a large-scale device is necessary and the screen cannot be chosen without any restraint. A speckle pattern that is generated can be suppressed using a beam oscillating means that oscillates a light spot on the screen at a high speed, causing a viewer to perceive a time-mean image as not having speckle noises.

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