PROJECTION DISPLAY APPARATUS
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.
1 . A projection display apparatus, comprising:
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,
wherein 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.
2 . The projection display apparatus according to claim 1 , further comprising a movement mechanism that vibrates the first diffuser plate in the first direction or the second direction at a certain cycle.
3 . The projection display apparatus according to claim 1 , further comprising a second diffuser plate that has a substantially same diffusion characteristics in the first direction and the second direction,
wherein the second diffuser plate is disposed between the solid-state light source array and the first diffuser plate.
4 . The projection display apparatus according to claim 1 , wherein each of the plurality of solid-state light sources is a laser diode.
5 . The projection display apparatus according to claim 1 , wherein the light uniformizing element is a rod integrator.
6 . The projection display apparatus according to claim 1 , further comprising a second diffuser plate that has a substantially same diffusion characteristics in the first direction and the second direction,
wherein the second diffuser plate is disposed between the first diffuser plate and the light uniformizing element.
7 . The projection display apparatus according to claim 3 , further comprising a movement mechanism that vibrates the second diffuser plate in the first direction or the second direction at a certain cycle.
8 . The projection display apparatus according to claim 6 , further comprising a movement mechanism that vibrates the second diffuser plate in the first direction or the second direction at a certain cycle.
9 . The projection display apparatus according to claim 1 , wherein
the light emitted from the solid-state light source array has a first diffusion angle component in the first direction and a second diffusion angle component in the second direction, and is incident on the first diffuser plate,
the first diffuser plate has diffusion characteristics of a first diffusion angle in the first direction and a second diffusion angle in the second direction, and
a sum of the first diffusion angle component and the first diffusion angle substantially coincides with a sum of the second diffusion angle component and the second diffusion angle.