Near-eye light field display device and near-eye display device
A near-eye light field display device includes a display element, a microlens array and an optical element. The display element has a plurality of micro-image units and each of the plurality of micro-image units is configured to provide an elemental image beam. The microlens array is disposed in front of the display element and has a plurality of microlenses corresponding to the plurality of the micro-image units respectively. The optical element is disposed in front of the microlens array and located on a transmission path of the elemental image beams from the microlenses. An Abbe number of the microlens array is Vd MLA , a refractive index of the microlens array is nd MLA , an Abbe number of the optical element is Vd OE , a refractive index of the optical element is nd OE , and the microlens array and the optical element meet at least one of: Vd OE >Vd MLA and nd OE <nd MLA .
1. A near-eye light field display device, comprising:
a display element, comprising a plurality of micro-image units, wherein each of the plurality of micro-image units is configured to provide an elemental image beam;
a microlens array, disposed in front of the display element and comprising a plurality of microlenses, wherein the plurality of microlenses corresponds to the plurality of micro-image units respectively; and
an optical element, disposed in front of the microlens array and located on a transmission path of the elemental image beams after passing through the plurality of microlenses, wherein the microlens array is located between the optical element and the display element, and each of the elemental image beams is projected toward the optical element after passing through a corresponding one of the plurality of microlens,
wherein an Abbe number of the microlens array is Vd MLA , a refractive index of the microlens array is nd MLA , an Abbe number of the optical element is Vd OE , a refractive index of the optical element is nd OE , and the microlens array and the optical element meet at least one of conditions: Vd OE >Vd MLA , and nd OE <nd MLA .
2. The near-eye light field display device according to claim 1 , wherein the optical element has a first surface and a second surface, the first surface is adjacent to the microlens array, and the second surface is away from the microlens array, wherein the first surface is a convex surface, and the second surface is a plane surface, and wherein the first surface is a spherical surface or an aspherical surface.
3. The near-eye light field display device according to claim 1 , wherein the optical element has a first surface and a second surface, the first surface is adjacent to the microlens array, and the second surface is away from the microlens array, wherein the first surface is a plane surface, and the second surface is a convex surface, and wherein the second surface is a spherical surface or an aspherical surface.
4. The near-eye light field display device according to claim 1 , wherein the optical element has a first surface and a second surface, the first surface is adjacent to the microlens array, and the second surface is away from the microlens array, wherein the first surface has a convex surface, and the second surface has a concave surface, and wherein the first surface is a spherical surface or an aspherical surface, and the second surface is a spherical surface or an aspherical surface.
5. The near-eye light field display device according to claim 1 , wherein the optical element has a first surface and a second surface, the first surface is adjacent to the microlens array, and the second surface is away far from the microlens array, wherein the first surface is a diffractive optical element surface, and the second surface is a convex surface, and wherein the second surface is a spherical surface or an aspherical surface.
6. The near-eye light field display device according to claim 1 , wherein the optical element has a first surface and a second surface, the first surface is adjacent to the microlens array, and the second surface is away from the microlens array, wherein the first surface is a convex surface, and the second surface is a diffractive optical element surface, and wherein the first surface is a spherical surface or an aspherical surface.
7. The near-eye light field display device according to claim 1 , wherein the optical element has a first surface and a second surface, the first surface is adjacent to the microlens array, and the second surface is away from the microlens array, and wherein the first surface is a Fresnel lens surface, and the second surface is a diffractive optical element surface.
8. The near-eye light field display device according to claim 1 , further comprising a light redirecting element, wherein the elemental image beams are converted into image beams after passing through the optical element, and the light redirecting element is located on a transmission path of the image beams from the optical element.
9. The near-eye light field display device according to claim 8 , wherein the light redirecting element is a partially-penetrating-and-partially-reflecting element.
10. The near-eye light field display device according to claim 1 , wherein focal lengths of the plurality of microlenses are identical.
11. The near-eye light field display device according to claim 1 , wherein focal lengths of the plurality of microlenses are different.
12. The near-eye light field display device according to claim 1 , wherein the microlens array has an adjustable focal length.
13. The near-eye light field display device according to claim 1 , wherein the optical element has an adjustable focal length.
14. A near-eye display device, comprising:
a display element, comprising a plurality of micro-image units, wherein each of the plurality of micro-image units is configured to provide an elemental image beam;
a microlens array, disposed in front of the display element and comprising a plurality of microlenses, wherein the plurality of microlenses corresponds to the plurality of micro-image units respectively; and
an optical element, disposed in front of the microlens array and located on a transmission path of the elemental image beams after passing through the plurality of microlenses, wherein the microlens array is located between the optical element and the display element, and each of the elemental image beams is projected toward the optical element after passing through a corresponding one of the plurality of microlens,
wherein at least one of the microlens array and the optical element has an adjustable focal length,
wherein an Abbe number of the microlens array is Vd MLA , a refractive index of the microlens array is nd MLA , an Abbe number of the optical element is Vd OE , a refractive index of the optical element is nd OE , and the microlens array and the optical element meet at least one of conditions: Vd OE >Vd MLA and nd OE <nd MLA .
15. A near-eye display device, comprising:
a display element, comprising a plurality of micro-image units, wherein each of the plurality of micro-image units is configured to provide an elemental image beam;
a microlens array, disposed in front of the display element and comprising a plurality of microlenses, wherein the plurality of microlenses corresponds to the plurality of micro-image units respectively; and
an optical element, disposed in front of the microlens array and located on a transmission path of the elemental image beams after passing through the plurality of microlenses, wherein the microlens array is located between the optical element and the display element, and each of the elemental image beams is projected toward the optical element after passing through a corresponding one of the plurality of microlens,
wherein at least one of the microlens array and the optical element has an adjustable focal length,
wherein an Abbe number of the microlens array is Vd MLA , a refractive index of the microlens array is nd MLA , an Abbe number of the optical element is Vd OE , a refractive index of the optical element is nd OE , and the microlens array and the optical element meet y at least one of conditions: Vd OE <Vd MLA and nd OE >nd MLA .
16. A near-eye display device, comprising:
a display element, comprising a plurality of micro-image units, wherein each of the plurality of micro-image units is configured to provide an elemental image beam;
a microlens array, disposed in front of the display element and comprising a plurality of microlenses, wherein the plurality of microlenses corresponds to the plurality of micro-image units respectively; and
an optical element, disposed in front of the microlens array and located on a transmission path of the elemental image beams after passing through the plurality of microlenses, wherein the microlens array is located between the optical element and the display element, and each of the elemental image beams is projected toward the optical element after passing through a corresponding one of the plurality of microlens,
wherein at least one of the microlens array and the optical element has an adjustable focal length,
wherein an Abbe number of the microlens array is Vd MLA , a refractive index of the microlens array is nd MLA , an Abbe number of the optical element is Vd OE , a refractive index of the optical element is nd OE , and the microlens array and the optical element meet at least one of conditions: Vd OE =Vd MLA and nd OE =nd MLA .