Projection display device having light source device with color synthesis unit

摘要

A light source device includes: a first light source (3a) that emits first polarized light of a plurality of colors including different wavelengths; a second light source (3b) that emits second polarized light whose polarization state differs from that of the first polarized light and that includes light of at least one color from among the plurality of colors; and a first color synthesis optical element (1) that synthesizes the first polarized light emitted from the first light source (3a) and the second polarized light emitted from the second light source (3b).

主权项

1. A light source device comprising:
a first light source that emits light of a plurality of colors including different wavelengths of a first polarization; a light source unit that emits light of a second polarization whose polarization state differs from that of the first polarization and that includes light of at least one color among said plurality of colors; and a color synthesis unit that synthesizes light of said first polarization that is emitted from said first light source and light of said second polarization that is emitted from said light source unit, wherein: said light source unit includes a second light source that emits first colored light of said second polarization whose peak wavelength is set in a first wavelength band; and said color synthesis unit includes a first color synthesis optical element that synthesizes light of said first polarization that is emitted from said first light source and first colored light of said second polarization that is emitted from said second light source; wherein: said first color synthesis optical element includes: a first exit surface; a first incident surface to which light of said plurality of colors of said first polarization is supplied from said first light source; a second incident surface to which first colored light of said second polarization is supplied from said second light source; and a first film that selectively reflects or transmits incident light according to the wavelength of the light; wherein: said first film transmits, from among visible light of said first polarization, at least light of said plurality of colors, and reflects, from among visible light of said second polarization, at least light of said first wavelength band; the cutoff wavelength of said first film with respect to said second polarization is set within a range of bands other than said first wavelength band; and light of said plurality of colors of said first polarization that is irradiated from said first incident surface and first colored light of said second polarization that is irradiated from said second incident surface are exited from said first exit surface by way of said first film.