Patent ID: 8403493

Claim:
A projection apparatus comprising: a light source configured to emit light in a predetermined wavelength range; a light-source light generator configured to generate light-source light of two or more colors with different luminous efficiencies by time-sharing by using the light emitted from the light source; a light source controller configured to control timings of driving the light source and light-source light generator, so that the light-source light of two or more colors generated by the light-source light generator are cyclically generated, by setting a light-emitting period of at least one light-source light color having a higher luminous efficiency out of the two or more colors generated by the light-source light generator, shorter than those of the other light-source light colors, and setting a drive power of the light source during generation of the light-source light color whose light-emitting period is set short, greater than a drive power of the light source during generation of the other light-source light colors; an input unit configured to input an image signal; and a projector configured to form a light figure of colors corresponding to an image signal input from the input unit by using the light-source light generated based on the control of the light source controller, and to project the light figure; wherein in one period that is a predetermined period, the light source controller (i) sets the light-emitting period of the at least one light-source light color having the higher luminous efficiency, shorter than those of the other light-source light colors, and sets the drive power of the light source during generation of the light-source light color whose light-emitting period is set short, greater than the drive power of the light source generation of the other light-source light colors, and (ii) sets the light-emitting period of the other light source light colors longer, by an extent equivalent to setting the light-emitting period of the at least one light-source light color having the higher luminous efficiency shorter, and sets the drive power of the light source during generation of the other light-source light colors smaller, by an extent equivalent to setting the drive power of the light source during generation of the light-source light color whose light-emitting period is set short, so that a predetermined white balance is kept before and after the settings.