Display, display system, image projection system, and movable object
Provided is a head-up display including a display system that has 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, and a backlight that emits light toward the Fresnel lens. The head-up display also includes a first mirror that reflects light from the display system, a second mirror that reflects light from the first mirror, and a control circuit that controls the liquid-crystal panel, where a center of the second mirror is closer to a center of the control circuit than a center of the display system in a direction connecting a center of the first mirror and the center of the second mirror.
1. A head-up display comprising:
a display system comprising:
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; and
a backlight that emits light toward the Fresnel lens;
a first mirror that reflects light from the display system;
a second mirror that reflects light from the first mirror; and
a control circuit that controls the liquid-crystal panel, wherein
a center of the second mirror is closer to a center of the control circuit than a center of the display system in a direction connecting a center of the first mirror and the center of the second mirror.
2. The head-up display according to claim 1 , wherein
the control circuit is disposed below the second mirror.
3. The head-up display according to claim 1 , wherein
the display system further comprises a light-diffusion structure between the liquid-crystal panel and the Fresnel lens.
4. The head-up display according to claim 3 , wherein
the light-diffusion structure has a thickness equal to or smaller than 300 μm.
5. The head-up display according to claim 3 , wherein
the light-diffusion structure has a transmittance equal to or larger than 70%.
6. The head-up display according to claim 3 , 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.
7. The head-up display according to claim 3 , wherein
the light-diffusion structure is in contact with the liquid-crystal panel.
8. The head-up display according to claim 3 , further comprising a light-diffusion member, wherein
the light-diffusion structure is provided on at least one surface of the light-diffusion member.
9. The head-up display according to claim 8 , wherein
the light-diffusion member is thinner than the Fresnel lens.
10. The head-up display according to claim 1 , further comprising:
a light-transmissive member between the Fresnel lens and the backlight.
11. The head-up display according to claim 10 , wherein
the light-transmissive member is thinner than the Fresnel lens.
12. The head-up display according to claim 1 , further comprising:
a heat sink accommodating the Fresnel lens and the backlight.
13. The head-up display according to claim 12 , wherein
the heat sink has a plurality of fins protruding from an outer surface of the heat sink.
14. The head-up display according to claim 12 , wherein
the heat sink is made of aluminum.
15. The head-up display according to claim 1 , wherein
a surface of the Fresnel lens facing the backlight is uneven.
16. The head-up display according to claim 1 , wherein
light emitted from the backlight diverges in a direction toward the Fresnel lens.
17. The head-up display according to claim 1 , wherein
the backlight includes light emitting diodes or laser diodes.
18. The head-up display according to claim 1 , wherein
the Fresnel lens is made of glass or resin.
19. The head-up display according to claim 1 , wherein
an upper end of the control circuit is disposed below a lower end of the second mirror.
20. The head-up display according to claim 1 , wherein
the Fresnel lens is disposed between the liquid-crystal panel and the backlight.