The present invention provides a projection device comprising a semiconductor light source comprises a plurality of sub light sources arranged in an array, an illumination optical system for guiding an illumination light emitted from the semiconductor light source, a spatial light modulator for receiving and applying an image signal for modulating the illumination light emitted from the semiconductor light source guided by said illumination optical system, a control circuit for controlling the semiconductor light source and the spatial light modulator and a projection optical system for projecting images by applying the illumination light modulated by the spatial light modulator. The control circuit controls or adjusts the emitting state of the semiconductor light source by modifying at least two of following parameters consisted of an emission intensity, a number of times of emission, an emission period and an emitting timing of the sub light source or a number of emitted light and an emitting position of the sub light sources.