Patent ID: 9400419
Filing Date: 2016-07-26
CPC Classification: G02B,G03B,H04N

Claim Text:
1. An illumination device comprising: a first light source that includes a solid-state light source having a peak wavelength that is set in a red wavelength band; a second light source that includes a solid-state light source having a peak wavelength that is set in a green wavelength band; a third light source that includes a solid-state light source having a peak wavelength that is set in a blue wavelength band; and a color synthesis optical element that synthesizes colored light of a first polarization that enters the color synthesis optical element from said second light source and colored light of a second polarization having a polarization state that differs from a polarization state of said first polarization, the colored light of the second polarization entering the color synthesis optical element from said first light source and said third light source; wherein any one of said first light source, said second light source and said third light source further includes at least one solid-state light source having a peak wavelength that is set in a specific wavelength band that is a wavelength band of a color of the solid-state light source that is used in one of the remaining two light sources, wherein said color synthesis optical element comprises: wherein: said first film transmits, of visible light of said first polarization, at least light of said specific wavelength band and reflects, of visible light of said second polarization, at least light of said specific wavelength band; said second film transmits, of said visible light of said first polarization, at least light of said specific wavelength band and transmits, of said visible light of said second polarization, at least light of said specific wavelength band; and cutoff wavelengths of said first film and said second film with respect to said second polarization are set within ranges of bands other than the wavelength bands of red, green, and blue that are three primary colors of light, and at least colored light of said second polarization that enters the color synthesis optical element from said first incident surface, colored light of said first polarization that enters the color synthesis optical element from said second incident surface, and colored light of said second polarization that enters the color synthesis optical element from said third incident surface exit the color synthesis optical element from said exit surface by way of said first and second films.