Real image display device with wide viewing angle
A 3-dimensional image display device having wide viewing angles using Fresnel lenses is disclosed. According to an embodiment of the invention, the 3-dimensional image display device includes an image source providing part for providing an image source, a first Fresnel lens refracting and transmitting the image source that is incident from the image source providing part, and a second Fresnel lens for generating a 3-dimensional image by refracting and transmitting the image source transmitted from the first Fresnel lens. At least one of the first Fresnel lens and the second Fresnel lens is a curved type Fresnel lens surface. The present invention can maximize the display area for a 3-dimensional image and realize the 3-dimensional image having wide viewing angles without distortion on the left and right boundaries.
1. A 3-dimensional image display device having wide viewing angles, comprising:
an image source for supplying an image;
a first Fresnel lens configured to refract and transmit the image being incident from the image source; and
a second Fresnel lens configured to generate a 3-dimensional image by refracting and transmitting the image transmitted by the first Fresnel lens,
wherein at least one of the first Fresnel lens and the second Fresnel lens is a curved Fresnel lens, wherein a focal length of the first Fresnel lens is greater than a focal length of the second Fresnel lens.
2. The 3-dimensional image display device of claim 1 , wherein the first Fresnel lens is a curved Fresnel lens and grooves of the curved Fresnel lens are formed in a direction facing the image source, and the second Fresnel lens is a flat Fresnel lens and grooves of the flat Fresnel lens are formed in a direction facing opposite the image source.
3. A 3-dimensional image display device having wide viewing angles, comprising:
an image source for supplying an image;
a first Fresnel lens configured to refract and transmit the image being incident from the image source; and
a second Fresnel lens configured to generate a 3-dimensional image by refracting and transmitting the image transmitted by the first Fresnel lens,
wherein at least one of the first Fresnel lens and the second Fresnel lens is a curved Fresnel lens, wherein the focal length of the first Fresnel lens is smaller than the focal length of the second Fresnel lens.
4. The 3-dimensional image display device of claim 1 or claim 3 , further comprising a third Fresnel lens interposed between the first Fresnel lens and the second Fresnel lens and refracting and transmitting an image transmitted through the first Fresnel lens, wherein the first Fresnel lens and the third Fresnel lens are curved Fresnel lenses curved in opposite directions, and grooves of the first Fresnel lens are formed in a direction of facing the image source, and grooves of the third Fresnel lens are formed in a direction of facing the second Fresnel lens, and the second Fresnel lens is a flat Fresnel lens.
5. The 3-dimensional image display device of claim 1 or claim 3 , further comprising a third Fresnel lens interposed between the first Fresnel lens and the second Fresnel lens and refracting and transmitting an image transmitting through the first Fresnel lens, wherein the first Fresnel lens and the third Fresnel lens are flat Fresnel lenses, and grooves of the first Fresnel lens and grooves of the third Fresnel lens are formed in a direction of facing each other or in opposite directions, and the second Fresnel lens is a curved Fresnel lens.
6. The 3-dimensional image display device of claims 1 or claim 3 , wherein any one of anti-glare, an AR polarized film and a surface antireflection mask is coated over a surface of the first Fresnel lens or the second Fresnel lens.
7. The 3-dimensional image display device of claim 1 or claim 3 , wherein the image source comprises:
a main image source for providing a main image; and
a background image source for providing a background image as a background of the main image.
8. The 3-dimensional image display device of claim 7 , wherein the image source further comprises a translucent minor configured to reflect the main image and transmit the background image.
9. The 3-dimensional image display device of claim 7 , wherein the image source is a real object or a display of any one selected from the group consisting of CRT, LCD, PDP, LED, OLED, DLP projectors and flexible displays.
10. A Fresnel lens having grooves formed on both sides thereof, comprising:
a curved type Fresnel lens surface configured to refract and transmit incident light; and
a flat type Fresnel lens surface configured to refract and transmit light transmitted through the curved type Fresnel lens surface and have a smaller focal length than the curved type Fresnel lens surface.
11. A 3-dimensional image display device having wide viewing angle, comprising:
an image source for providing an image; and
a Fresnel lens, a curved type Fresnel lens surface and a flat type Fresnel lens surface formed respectively on either side of the Fresnel lens, the curved type Fresnel lens surface refracting and transmitting incident light, the flat type Fresnel lens surface refracting and transmitting light transmitted through the curved type Fresnel lens surface and having a smaller focal length than the curved type Fresnel lens surface.
12. The 3-dimensional image display device of claim 11 , wherein the image source comprises:
a main image source for providing a main image; and
a background image source for providing a background image as a background of the main image.
13. The 3-dimensional image display device of claim 11 or claim 12 , wherein the image source further comprises a translucent mirror configured to reflect the main image and transmit the background image.
14. The 3-dimensional image display device of claim 11 , wherein the image source is a real object or a display of any one selected from the group consisting of CRT, LCD, PDP, LED, OLED, DLP projectors and flexible displays.
15. The 3-dimensional image display device of claim 11 , wherein any one of anti-glare, an AR polarized film and a surface antireflection mask is coated over a surface of the flat type Fresnel lens surface.