Light source device and projection-type display apparatus

摘要

A light source device includes a plurality of light sources with different polarizations. A combined wavelength band of the light of a first polarization and second polarization is a first wavelength band. A combined wavelength band of a third polarization and fourth polarization is a second wavelength band. A plurality of selective transmission elements transmits one or more combined light of one or more polarizations and reflects one or more light of one or more polarizations. Thus, the light of the first polarization, the light of the second polarization and the light of the third polarization passing through a third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction.

主权项

1. A light source device comprising;
a first light source that emits light of a first polarization; a second light source that emits light of a second polarization whose polarization direction is different from the light of the first polarization by 90 degrees, wherein a combined wavelength band of the light of the first polarization and the light of the second polarization is a first wavelength band; a third light source that emits light of a third polarization and of a wavelength band which is different from the first wavelength band; a first selective transmission element that transmits the light of the first polarization and reflects the light of the second polarization based on the polarization direction of the light; a second selective transmission element that transmits combined light of the light of the first polarization passing through the first selective transmission element and the light of the second polarization reflected by the first selective transmission element based on the wavelength band of the light, and reflects the light of the third polarization based on the wavelength band of the light; a fourth light source that emits light of a fourth polarization whose polarization direction is different from the light of the third polarization by 90 degrees; and a third selective transmission element that transmits the combined light of the light of the first polarization and the light of the second polarization passing through the second selective transmission element based on the wavelength band of the light, transmits the light of the third polarization reflected by the second selective transmission element based on the polarization direction of the light, and reflects the light of the fourth polarization, wherein the light of the first polarization and the light of the second polarization passing through the second selective transmission element, and the light of the third polarization reflected by the second selective transmission element proceed in the same direction, wherein the light of the first polarization, the light of the second polarization and the light of the third polarization passing through the third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction.