Head-up display device and vehicle
View Patent ↗A head-up display device includes a display element, a movable mirror, one or more first and second mirrors, and an movable unit. The display element emits light to form a display image. The movable mirror first reflects light emitted from the display element. The one or more first and second mirrors reflect light reflected off the movable mirror to project a virtual image. The movable unit adjusts a position of the movable mirror to adjust a projection distance of the virtual image. The movable mirror is disposed at a position such that light incident to the movable mirror is non-parallel to a normal of the movable mirror.
1. A head-up display device comprising:
a display device that emits light to form a display image;
a first optical member that first reflects light emitted from the display device;
one or more second optical members that reflect or transmit the reflected light of the first optical member to project a virtual image; and
an adjuster that adjusts a position of the first optical member to adjust a projection distance of the virtual image,
wherein the first optical member is positioned such that incident light to the first optical member is non-parallel to a normal of the first optical member, and
wherein the display device shifts a display position of the display image in its display area in accordance with a position of the first optical member.
2. The head-up display device according to claim 1 , wherein
the adjuster moves the first optical member in a direction in which a surface distance between the first optical member and the second optical member changes.
3. The head-up display device according to claim 1 , wherein
the first optical member is a substantially plane mirror.
4. The head-up display device according to claim 1 , wherein
the first optical member is a free-form surface mirror, an aspherical mirror, or a spherical mirror.
5. The head-up display device according to claim 1 , wherein
the display includes an illumination member, and
the illumination member shifts an illumination area in accordance with the display position.
6. The head-up display device according to claim 1 , wherein
a relationship in the following expression is satisfied, wherein a moving distance of the first optical member is indicated as δd, an angle formed by a first light beam emitted from the center of a display image displayed in the display device, and a normal of the display device, is indicated as ϕ, an incident angle of the first light beam to the first optical member is indicated as θ, and a distance of display position shift of a display image in the display device in accordance with movement of the first optical member is indicated as δy
δ
y
=
2
δ
d
sin
θ
cos
ϕ
.
[
Expression
1
]
7. The head-up display device according to claim 1 , wherein
the display device is disposed such that it emits light toward a predetermined tilted direction from the normal of its display area and the emitted light forms the virtual image, and
the predetermined direction is identical to a direction in which a display position of an image in the display device is shifted to reduce a display distance of the virtual image.
8. The head-up display device according to claim 1 , wherein
the adjuster adjusts a projection distance of a virtual image based on the travel location information on a vehicle.
9. The head-up display device according to claim 1 , wherein
the adjuster adjusts a projection distance of a virtual image based on the vehicle speed information.
10. The head-up display device according to claim 1 , further comprising:
an image processing unit that adjusts the display image,
the image processing unit adjusting display magnification of the display image in accordance with a position of the first optical member.
11. The head-up display device according to claim 1 , further comprising:
an image processing unit that adjusts the display image,
the image processing unit correcting image distortion of the display image in accordance with a position of the first optical member.
12. The head-up display device according to claim 1 , further comprising:
a third optical member that reflects light emitted from the display device,
wherein the second optical member reflects or transmits the reflected light of the third optical member to project a virtual image different from the said virtual image.
13. A vehicle comprising the head-up display device according to claim 1 .
14. The head-up display device according to claim 1 , wherein the first optical member is movable with respect to the display device.
15. The head-up display device according to claim 1 , wherein a position of the display device is fixed with respect to the first optical member.