A light source device includes a light source section adapted to emit excitation light, a lens array adapted to divide the excitation light into a plurality of partial light beams, a light collection optical system adapted to collect the excitation light divided into the plurality of partial light beams, and a light emitting element adapted to emit fluorescence by being excited by the excitation light.

A projector includes: a light source that emits light of a first color and a second color; a first image formation element that forms a first image light of the first color; a second image formation element that forms a second image light of the second color; a projection lens that projects the first image light and the second image light to the outside; a first optical system that guides light of the first color that is emitted from the light source to the first image formation element, and guides light of the first color from the first image formation element to the projection lens; and a second optical system that guides light of the second color that is emitted from the light source to the second image formation element, and guides light of the second color from the second image formation element to the projection lens; wherein the first optical system has a convex lens between the first image formation element and the projection lens, wherein f-number of the first optical system is greater than f-number of the second optical system.

A light source apparatus according to the present disclosure includes a light source section, a first polarization separator that transmits in a first polarization component of the first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, a first wavelength converter that converts the wavelength of the first polarization component into second light, and a second wavelength converter that is disposed in a position shifted in a fifth direction from a placement plane where the first polarization separator and the second polarization separator are placed, converts the wavelength of the excitation light into third light, and the second polarization separator transmits the first polarization component of the second light and reflects the second polarization component of the second light.

A display device includes an optical combiner including a first surface; a second surface disposed at a first side of the first surface; and a third surface disposed at a second side of the first surface; a diffractive optical element disposed on the first surface of the optical combiner; a first display panel disposed on the second surface of the optical combiner and displaying a first color image; and a second display panel disposed on the third surface of the optical combiner and displaying a second color image.

The cross dichroic prism according to the present disclosure includes four prisms and two dichroic mirrors. Each of the four prisms has a triangle-prism shape. The four prisms are arranged to form a quadrangular prism as a whole in a manner such that the ridge line portions are located close to each other, a first plane of one prism faces a second plane of another prism, and a third plane faces outward. Each of the two dichroic mirrors is constituted of a dielectric multilayer film provided between the first plane of one prism and the second plane of another prism. The outermost layer of a dielectric layer constituting the dielectric multilayer film is provided in contact with each of the first plane of the one prism and the second plane of the other prism.

An image display module according to the present disclosure includes a first display panel including a plurality of first pixels each including a first light-emitting element, the first display panel being configured to emit first colored light of a first wavelength region, a second display panel including a plurality of second pixels each including a second light-emitting element and a plurality of third pixels each including a third light-emitting element, the second display panel being configured to emit second colored light of a second wavelength region, and emit third colored light of a third wavelength region, and a synthesis optical system including a dichroic prism which including a dichroic mirror and being configured to synthesize the first, the second, and the third colored light, the dichroic mirror being configured to transmit or reflect the first colored light and reflect or transmit the second and the third colored light.

A light source apparatus includes a red LD array that emits light in a red bandwidth, a blue LD array that emits light in a blue bandwidth, and a light combining part that includes a transmissive region and a reflecting region, the transmissive region transmitting the light emitted from the red LD array therethrough, the reflecting region reflecting the light emitted from the blue LD array.

A light source apparatus according to an aspect of the present disclosure includes a first light source section, a second light source section, a first polarization separator, a second polarization separator that reflects part of second light and transmits the other part of the second light, a first phase retarder which is disposed between the first polarization separator and the second polarization separator and on which the part of the second light reflected off the second polarization separator is incident, a wavelength conversion layer that converts the first light and the part of the second light into third light having a second wavelength band and outputs the third light toward the first polarization separator, and a first light focusing optical system disposed between the wavelength conversion layer and the first polarization separator. The wavelength conversion layer has a first surface via which the third light exits and a second surface that intersects with the first surface. The first light is focused by the first light focusing optical system and enters the wavelength conversion layer at least via the second surface thereof, and the second light enters the wavelength conversion layer via the first surface thereof.

A light source device includes: multiple light source units each including a light source to emit a first color light beam, each of the multiple light source units configured to: convert at least part of the first color light beam into a second color light beam emitted from an emitting region; and emit the second color light beam to form a conjugate image; and a light combiner to combine the conjugate images formed by the multiple light source units to form a combined image, in which the conjugate images partially overlap each other, on a plane of an entrance surface of a light uniformizing element along a central axis of the light uniformizing element. A conditional expression below is satisfied:

1.3>SC/SI>0.7 where SC is an area of the combined image, and SI is an area of the entrance surface of the light uniformizing element.

An image light generation device of the present disclosure includes first to third display elements configured to emit first to third color light, respectively, and a color synthesis element configured to synthesize the first to third color light. The color synthesis element includes first to third prisms, a first dichroic film configured to reflect the first color light and transmit the second and third color light, and a second dichroic film configured to reflect the second color light and transmit the third color light. The first and second prisms are joined together through a first dichroic film with no air layer therebetween, the second and third prisms are joined together through a second dichroic film with no air layer therebetween, and the main light beam incidence angle of the third color light to the second dichroic film is 40 degrees or greater.