Image display device
An image display device includes a display device and an optical modulator. The display device has a normal direction, the optical modulator is disposed on the display device, and an included angle θ is between the optical modulator and the display device, wherein the included angle θ ranges from 20 degrees to 70 degrees.
1 . An image display device, comprising:
a display device having a normal direction and comprising a side edge parallel to a first direction, wherein the first direction is perpendicular to the normal direction;
an optical modulator disposed on the display device, wherein an included angle θ is between the optical modulator and the display device;
a first reference object; and
a second reference object disposed on a side of the display device in a second direction and disposed adjacent to the side edge of the display device, wherein the second direction is perpendicular to the normal direction and the first direction;
wherein the included angle θ ranges from 20 degrees to 70 degrees;
wherein the image display device images a projected image on an image-plane, the first reference object is close to the image-plane, and a distance between the first reference object and the image-plane is less than a distance between the second reference object and the image-plane.
2 . The image display device according to claim 1 , wherein a minimum distance h exists between the optical modulator and the display device in the normal direction, the display device has a light intensity distance maintenance rate α of a light source contained in the display device and a center brightness B, the optical modulator has an optical efficiency η, the optical modulator has a length La, and the minimum distance h is greater than or equal to 10 cm and less than or equal to
1
2
(
log
3
0
0
η
×
B
log
α
×
1
0
0
-
L
a
2
)
cm
.
3 . The image display device according to claim 1 , wherein a distance between the first reference object and the image-plane in the first direction is less than or equal to 50 cm.
4 . The image display device according to claim 3 , wherein a distance between the second reference object and the first reference object in the first direction is greater than 50 cm.
5 . The image display device according to claim 4 , wherein a minimum distance h exists between the display device and the optical modulator in the normal direction, and the distance between the second reference object and the first reference object in the first direction is h+50 cm.
6 . The image display device according to claim 4 , wherein the second reference object is aligned with a midpoint of the side edge of the display device in the second direction.
7 . The image display device according to claim 3 , wherein the image display device further comprises a third reference object, a distance between the third reference object and the first reference object in the first direction is greater than 50 cm, and the first reference object is between the display device and the third reference object.
8 . The image display device according to claim 1 ,
wherein the display device has a first light intensity in the normal direction;
wherein when an angle between a direction and the normal direction is greater than a first angle φ and less than or equal to 90 degrees, a ratio of a light intensity of the display device in the direction to the first light intensity less than 10%;
wherein the first angle φ and the included angle θ satisfy
φ
=
cos
-
1
(
sin
θ
1
+
cos
2
θ
)
,
and the first angle φ is less than or equal to 55 degrees.
9 . The image display device according to claim 1 , wherein the optical modulator comprises a first sub optical modulator and a second sub optical modulator, the second sub optical modulator is disposed adjacent to the first sub optical modulator, and a connecting material exists between the first sub optical modulator and the second sub optical modulator.
10 . The image display device according to claim 9 , wherein the connecting material comprises a first refractive index n f , the first sub optical modulator comprises a second refractive index n r , and the first refractive index n f and the second refractive index n r satisfy 0.9n r ≤n f ≤1.1n r .
11 . The image display device according to claim 10 , wherein the connecting material comprises an adhesive material.
12 . The image display device according to claim 9 , wherein the connecting material is disposed between a sidewall of the first sub optical modulator and a sidewall of the second sub optical modulator.
13 . The image display device according to claim 1 , wherein the optical modulator is a multiple-reflection optical structure.
14 . The image display device according to claim 1 , wherein the optical modulator comprises a plurality of lattice structures.
15 . The image display device according to claim 1 , further comprising an adjusting component, wherein a minimum distance h exists between the optical modulator and the display device in the normal direction, and the adjusting component is configured to adjust the minimum distance h.
16 . The image display device according to claim 1 , further comprising an adjusting component configured to adjust the included angle θ between the optical modulator and the display device.
17 . The image display device according to claim 1 , wherein the optical modulator is between the display device and a ground.
18 . The image display device according to claim 1 , wherein the projected image is projected from an image displayed by the display device through the optical modulator.
19 . The image display device according to claim 18 , wherein a ratio of a size of the projected image to a size of the image displayed by the display device is greater than or equal to 0.9 and less than or equal to 1.
20 . The image display device according to claim 18 , wherein the projected image is floating.