Optical device and display system

Abstract

An optical device and a display system are provided. The optical device includes a plurality of first strip-shaped optical microstructures and a plurality of second strip-shaped optical microstructures. Top surfaces of the first strip-shaped optical microstructures form a first optical surface, and each of the first strip-shaped optical microstructure has a first center line. There is a first height difference between the highest position and the lowest position of each first center line, or a first difference between the highest positions of any two of the first center lines. Top surfaces of the second strip-shaped optical microstructures form a second optical surface, and each of the second strip-shaped optical microstructure has a second center line. There is a second height difference between the highest position and the lowest position of each second center line, or a second difference between the highest positions of any two of the second center lines. The optical device and the display system provided have good optical efficiency and picture quality and are easy to manufacture.

Claims

1. An optical device having a first optical surface and a second optical surface, the optical device comprising: Multiple first strip-shaped optical microstructures extend along a first direction, the top surface of the multiple first strip-shaped optical microstructures forms the first optical surface, and each of the multiple first strip-shaped optical microstructures has a first center line, the highest position and the lowest position of each first center line have a first height difference or there is a first gap between the highest positions of any two first center lines. The device includes a plurality of second strip-shaped optical microstructures extending along a second direction. The top surfaces of the plurality of second strip-shaped optical microstructures form a second optical surface. The first direction is not parallel to the second direction, and each second strip-shaped optical microstructure has a second center line. The highest and lowest positions of each second center line have a second height difference, or there is a second gap between the highest positions of any two second center lines. At least one of the first height difference and the first gap is greater than or equal to a predetermined value, and at least one of the second height difference and the second gap is greater than or equal to the predetermined value. The predetermined value is in the range of λ / [4(n-1)] and 4λ / (n-1), where λ is a preset minimum operating wavelength of light passing through the optical device, and n is the equivalent refractive index of each first strip-shaped optical microstructure or each second strip-shaped optical microstructure.

2. The optical device as claimed in claim 1, wherein the first center line of any first strip optical microstructure and the second center line of any second strip optical microstructure are function curves of one or more superimposed sine functions, or non-periodic function curves, and the first center line curves of adjacent first strip optical microstructures are different, and the second center line curves of adjacent second strip optical microstructures are different.

3. The optical device as claimed in claim 1, wherein the first strip optical microstructure has a first lens profile in cross-section on a first plane orthogonal to the first direction, and the second strip optical microstructure has a second lens profile in cross-section on a second plane orthogonal to the second direction, wherein at least either the first lens profile or the second lens profile is an arc, a parabola or a free curve.

4. The optical device as claimed in claim 1, further comprising an optical film substrate, wherein the plurality of first strip optical microstructures and the plurality of second strip optical microstructures are respectively located on two opposing surfaces of the optical film substrate.

5. The optical device as claimed in claim 1, further comprising a first optical film substrate and a second optical film substrate, wherein the plurality of first strip-shaped optical microstructures are located on the first optical film substrate and the plurality of second strip-shaped optical microstructures are located on the second optical film substrate.

6. An optical device having a first optical surface and a second optical surface, the optical device comprising: Multiple first strip-shaped optical microstructures extend along a first direction, the top surface of the multiple first strip-shaped optical microstructures forms the first optical surface, and each of the multiple first strip-shaped optical microstructures has a first center line, the highest position and the lowest position of each first center line have a first height difference or there is a first gap between the highest positions of any two first center lines. The system includes a plurality of second strip-shaped optical microstructures extending along a second direction. The top surfaces of the plurality of second strip-shaped optical microstructures form a second optical surface. The first direction is not parallel to the second direction, and each second strip-shaped optical microstructure has a second center line. The highest and lowest positions of each second center line have a second height difference, or there is a second gap between the highest positions of any two second center lines. The absolute value of the slope of the tangent at each point on the first center line of any first strip-shaped optical microstructure and the absolute value of the slope of the tangent at each point on the second center line of any second strip-shaped optical microstructure are between 0 and 1.

2.

7. An optical device having a first optical surface and a second optical surface, the optical device comprising: Multiple first strip-shaped optical microstructures extend along a first direction, the top surface of the multiple first strip-shaped optical microstructures forms the first optical surface, and each of the multiple first strip-shaped optical microstructures has a first center line, the highest position and the lowest position of each first center line have a first height difference or there is a first gap between the highest positions of any two first center lines. The optical device further includes: a plurality of second strip-shaped optical microstructures extending along a second direction, the top surfaces of the plurality of second strip-shaped optical microstructures forming a second optical surface, the first direction and the second direction being non-parallel, and each second strip-shaped optical microstructure having a second center line, the highest and lowest positions of each second center line having a second height difference or a second gap between the highest positions of any two second center lines, wherein the cross-section of the first strip-shaped optical microstructure on a first plane orthogonal to the first direction is rectangular, and the cross-section of the second strip-shaped optical microstructure on a second plane orthogonal to the second direction is rectangular; the optical device further includes: at least one diffusion optical film having a plurality of first strip-shaped lens microstructures and second strip-shaped lens microstructures, the first strip-shaped lens microstructures being disposed corresponding to the first strip-shaped optical microstructures, and the second strip-shaped lens microstructures being disposed corresponding to the second strip-shaped optical microstructures.

8. An optical device having a first optical surface and a second optical surface, the optical device comprising: Multiple first strip-shaped optical microstructures extend along a first direction, the top surface of the multiple first strip-shaped optical microstructures forms the first optical surface, and each of the multiple first strip-shaped optical microstructures has a first center line, the highest position and the lowest position of each first center line have a first height difference or there is a first gap between the highest positions of any two first center lines. The optical device further includes: a plurality of second strip-shaped optical microstructures extending along a second direction, the top surfaces of which form a second optical surface; the first direction and the second direction are not parallel; each second strip-shaped optical microstructure has a second center line; the highest and lowest positions of each second center line have a second height difference or a second gap between the highest positions of any two second center lines; wherein the cross-section of the first strip-shaped optical microstructure on a first plane orthogonal to the first direction is rectangular, and the cross-section of the second strip-shaped optical microstructure on a second plane orthogonal to the second direction is rectangular; and the optical device further includes: a diffusion optical film having a plurality of lens microstructures arranged in a two-dimensional array on the diffusion optical film; wherein multiple columns of the lens microstructures forming the two-dimensional array are configured corresponding to one of the first strip-shaped optical microstructures and the second strip-shaped optical microstructures, and multiple rows of the lens microstructures forming the two-dimensional array are configured corresponding to the other of the first strip-shaped optical microstructures and the second strip-shaped optical microstructures.

9. A display system, comprising: A projection device for providing a projection beam; And an optical device disposed on the transmission path of the projection beam, having a first optical surface and a second optical surface, the optical device comprising: a plurality of first strip-shaped optical microstructures extending along a first direction, the top surface of the plurality of first strip-shaped optical microstructures forming the first optical surface, and each first strip-shaped optical microstructure having a first center line, the highest position and the lowest position of each first center line having a first height difference or a first gap between the highest positions of any two first center lines; The device includes a plurality of second strip-shaped optical microstructures extending along a second direction. The top surfaces of the plurality of second strip-shaped optical microstructures form a second optical surface. The first direction is not parallel to the second direction, and each second strip-shaped optical microstructure has a second center line. The highest and lowest positions of each second center line have a second height difference, or there is a second gap between the highest positions of any two second center lines. At least one of the first height difference and the first gap is greater than or equal to a predetermined value, and at least one of the second height difference and the second gap is greater than or equal to the predetermined value. The predetermined value is in the range of λ / [4(n-1)] and 4λ / (n-1), where λ is a preset minimum operating wavelength of light passing through the optical device, and n is the equivalent refractive index of each first strip-shaped optical microstructure or each second strip-shaped optical microstructure.

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