Multi-projection display and projector unit

1. A multi-projection display, comprising:

a plurality of projector units, each including a light source, an electrooptic modulator, and a projection system, the multi-projection display displaying an image on a projection screen by tiling projection using the plurality of projector units,

each of the plurality of projection units further including a light-quantity controller that controls the quantity of light to be projected from the projection system after a light to be controlled is emitted from the light source and before coloration of the light to be controlled, the light-quantity controller controlling the quantity of light on the basis of an imaged result of a projection image projected to a projection surface, and controlling the quantity of light in response to variation due to age in the quantity of light from the light source; and

an imaging device that images the projection image projected to the projection surface.

2. The multi-projection display according to claim 1 ,

the light-quantity controller being a dimmer capable of adjusting a transmission of light or being an optical limiting device capable of adjusting a passage of light.

3. The multi-projection display according to claim 1 ,

the plurality of projection units each including:

a plurality of electrooptic modulators as the electrooptic modulator,

a color-separation waveguide system that separates light from the light source into multiple color lights and guides each of the multiple color lights to the plurality of electrooptic modulators, respectively, and

a color combining system that combines the multiple color lights modulated by the plurality of electrooptic modulators; and

the light-quantity controller being disposed in an optical path from the light source to the color-separation waveguide system or an optical path from the color combining system to the projection system.

4. The multi-projection display according to claim 1 ,

the plurality of projection units each including:

a plurality of electrooptic modulators as the electrooptic modulator,

a color-separation waveguide system that separates light from the light source into multiple color lights and guides the multiple color lights to the electrooptic modulators, respectively, and

a color combining system that combines the color lights modulated by the plurality of electrooptic modulators; and

the light-quantity controller being disposed in each of optical paths from the color-separation waveguide system to the color combining system.

5. The multi-projection display according to claim 1 ,

the light-quantity controller controlling the quantity of light dynamically in consideration of information on an image to be projected by a projector unit to which the controller itself belongs.

6. A projector unit used for a multi-projection display, comprising:

a light source;

an electrooptic modulator;

a projection system;

a light-quantity controller that controls the quantity of light to be projected from the projection system after a light to be controlled is emitted from the light source and before coloration of the light to be controlled, the light-quantity controller controlling the quantity of light on the basis of an imaged result of a projection image projected to a projection surface, and controlling the quantity of light in response to variation due to age in the quantity of light from the light source; and

an imaging device that images the projection image projected to the projection surface.