A spectroscopic 3D image display device, comprising:
- at least one first projection type image display device that projects a first image onto a projection target by using first illumination light including colored light of two or more color bands;
- at least one second projection type image display device that projects a second image onto the projection target by using second illumination light including colored light of two or more color bands each having a wavelength different from wavelengths of the first illumination light, the second projection type image display device projecting the second image superimposed on the first image;
- and
- a system controller configured to control the first projection type image display device and the second projection type image display device,
- wherein
- each of the first projection type image display device and the second projection type image display device comprises:
- a light source device that emits blue light;
- a light modulation element that spatially modulates incident colored light of two or more color bands in accordance with an image signal, to generate projection light corresponding to the image signal;
- an illumination optical system that allows blue light emitted from the light source device to pass through and creates fluorescent light excited by the light emitted from the light source device, the illumination optical system outputting and directing the blue light and the fluorescent light to the light modulation element in a time-division manner;
- and
- a projection optical system that magnifies and projects the projection light from the light modulation element onto the projection object, to display an image thereon,
- wherein
- the light source device of the first projection type image display device is configured to emit a first blue light having a central wavelength λa and at least one third blue light having a central wavelength λc, the light source device of the second projection type image display device is configured to emit a second blue light having a central wavelength λb, the central wavelengths λa, λb, and λc satisfying λb≤λc<λa, and
- the system controller is configured to cause the light source devices to emit both the first blue light and the second blue light at a predetermined output power, and to cause the light source devices to emit the third blue light at a first output power that is lower than the output power of the first blue light and the second blue light when the illumination optical system outputs the blue light, and to cause the light source devices to emit the third blue light at a second output power that is higher than the first output power when the illumination optical system outputs the fluorescent light.