Display, display system, image projection system, and movable object
Provided is a head-up display including a liquid-crystal panel including a display screen, a Fresnel lens which is on an opposite side of the liquid-crystal panel from the display screen, a light-diffusion structure between the liquid-crystal panel and the Fresnel lens, and a mirror that forms a virtual image corresponding to an image displayed on the display screen of the liquid-crystal panel, in a target space, where the light-diffusion structure is thinner than the Fresnel lens, and the light-diffusion structure has a thickness equal to or smaller than 300 μm.
1. A head-up display comprising:
a liquid-crystal panel including a display screen;
a Fresnel lens disposed below the display screen;
a light-diffusion structure disposed below the liquid-crystal panel and above the Fresnel lens; and
a mirror that forms a virtual image corresponding to an image displayed on the display screen of the liquid-crystal panel, in a target space, wherein
the light-diffusion structure is thinner than the Fresnel lens; and
the light-diffusion structure has a thickness equal to or smaller than 300 μm.
2. The head-up display according to claim 1 , further comprising:
a backlight that emits light toward the Fresnel lens.
3. The head-up display according to claim 1 , wherein
the light-diffusion structure has a transmittance equal to or larger than 70%.
4. The head-up display according to claim 1 , wherein
the light-diffusion structure includes a plurality of fine particles, and
an average particle size of the plurality of fine particles is equal to smaller than 20 μm.
5. The head-up display according to claim 1 , wherein
the light-diffusion structure is in contact with the liquid-crystal panel.
6. The head-up display according to claim 2 , further comprising:
a light-transmissive member between the Fresnel lens and the backlight.
7. The head-up display according to claim 6 , wherein
the light-transmissive member is thinner than the Fresnel lens.
8. The head-up display according to claim 2 , further comprising:
a heat sink accommodating the Fresnel lens and the backlight.
9. The head-up display according to claim 8 , wherein
the heat sink has a plurality of fins protruding from an outer surface of the heat sink.
10. The head-up display according to claim 8 , wherein
the heat sink is made of aluminum.
11. The head-up display according to claim 2 , wherein
a surface of the Fresnel lens facing the backlight is uneven.
12. The head-up display according to claim 2 , wherein
light emitted from the backlight diverges in a direction toward the Fresnel lens.
13. The head-up display according to claim 2 , wherein
light emitted from the backlight converges in a direction toward the Fresnel lens.
14. The head-up display according to claim 2 , wherein
the backlight includes light emitting diodes or laser diodes.
15. The head-up display according to claim 1 , wherein
the Fresnel lens is made of glass or resin.