Abstract: There is provided a low-cost lighting optical system not requiring the refractive element for each laser chip.

Abstract: The light source device includes a first solid-state light source array emitting a first color light, a second solid-state light source array emitting a second color light, a third solid-state light source array emitting a third color light, and a light combiner for combining the first to third color lights respectively from the first to third solid-state light source arrays into a combined color light, and emitting a light flux of the combined color light in the same direction. The third solid-state light source array requiring the lowest target cooling temperature among the first to third solid-state light source arrays is disposed on a first side, and the first and second solid-state light source arrays are disposed on a second side, with an optical axis of the light flux emitted from the light combiner, as a boundary.

Abstract: A projection display apparatus of the present disclosure includes a solid-state light source array that includes a plurality of solid-state light sources, a first diffuser plate that diffuses light emitted from the solid-state light source array, a light uniformizing element that uniformizes the light diffused by the first diffuser plate, a light modulation element that modulates the light uniformized by the light uniformizing element with an image signal to generate image light, and a projection unit that projects the image light generated by the light modulation element. The first diffuser plate has different diffusion characteristics in a first direction and a second direction perpendicular to the first direction, and allows the light emitted from the solid-state light source array to be transmitted through the first diffuser plate to diffuse the light emitted to have an aspect ratio of an angle distribution that is approximately 1.

Abstract: The light source device includes a first solid-state light source array emitting a first color light, a second solid-state light source array emitting a second color light, a third solid-state light source array emitting a third color light, and a light combiner for combining the first to third color lights respectively from the first to third solid-state light source arrays into a combined color light, and emitting a light flux of the combined color light in the same direction. The third solid-state light source array requiring the lowest target cooling temperature among the first to third solid-state light source arrays is disposed on a first side, and the first and second solid-state light source arrays are disposed on a second side, with an optical axis of the light flux emitted from the light combiner, as a boundary.

Abstract: The light source device includes a first solid-state light source array emitting a first color light, a second solid-state light source array emitting a second color light, a third solid-state light source array emitting a third color light, and a light combiner for combining the first to third color lights respectively from the first to third solid-state light source arrays into a combined color light, and emitting a light flux of the combined color light in the same direction. The third solid-state light source array requiring the lowest target cooling temperature among the first to third solid-state light source arrays is disposed on a first side, and the first and second solid-state light source arrays are disposed on a second side, with an optical axis of the light flux emitted from the light combiner, as a boundary.

Abstract: The light source device includes a first solid-state light source array emitting a first color light, a second solid-state light source array emitting a second color light, a third solid-state light source array emitting a third color light, and a light combiner for combining the first to third color lights respectively from the first to third solid-state light source arrays into a combined color light, and emitting a light flux of the combined color light in the same direction. The third solid-state light source array requiring the lowest target cooling temperature among the first to third solid-state light source arrays is disposed on a first side, and the first and second solid-state light source arrays are disposed on a second side, with an optical axis of the light flux emitted from the light combiner, as a boundary.