Light source device and projection-type display apparatus

A light source device comprising:

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

A light source device comprising a plurality of light source modules,

• each light source modules 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;
• a reflecting element that reflects the light of the first polarization;
• and
• a selective transmission element that transmits the light of the first polarization reflected by the reflecting element based on the polarization direction of the light, and reflects the light of the second polarization,
• wherein an end portion of the reflecting element and an end portion of the selective transmission element are connected so that a surface of the reflecting element and a surface of the selective transmission element have an angle other than 180 degrees or 0 degree,
• wherein the light of the first polarization is reflected by the surface of the reflecting element on a side whose angle is smaller than 180 degrees, is incident on the surface of the selective transmission element on a side whose angle is smaller than 180 degrees, and passes through the selective transmission element,
• wherein the light of the second polarization is reflected by the surface of the selective transmission element on a side whose angle is larger than 180 degrees,
• wherein the light of the first polarization passing through the selective transmission element and the light of the second polarization reflected by the surface of the selective transmission element are emitted as a light flux proceeding in the same direction,
• wherein a plurality of light source modules are arranged so that the first light sources are disposed in the same direction with respect to the reflecting elements of the respective light source modules, and so that the second light sources are disposed in the same direction with respect to the selective transmission elements of the respective light source modules,
• wherein the reflecting element and the selective transmission element of one of the plurality of light source modules are disposed at a shifted position with respect to the reflecting element and the selective transmission element of another one of the plurality of light source modules toward a side where the first light source or the second light source of the one of the plurality of light source modules is disposed.