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US 11,373,344 B2Granted
Optical film
AssigneeToppan Printing Co., Ltd.
InventorsAkihito Kagotani, Toshiki Toda
Life of this patent
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Abstract
An optical film including a recording surface on which a plurality of unit blocks is disposed at regular intervals. For these unit blocks, phase components of light from a reconstruction point are calculated. The recording surface includes a calculated element region provided with an array of the unit blocks for which phase components of light from the reconstruction point are calculated for reproduction of an image. A first image is a monotone reconstruction image having even brightness, and a second image is a grayscale image having brightness gradation.
Claims19
An optical film comprising:
- a recording surface on which a plurality of unit blocks is disposed at regular intervals, wherein:
- the recording surface includes a first calculated element region provided with an array of unit blocks for which phase components of light from a reconstruction point configuring a first image are calculated, and a second calculated element region provided with an array of unit blocks for which phase components of light from a reconstruction point configuring a second image are calculated;
- the plurality of unit blocks comprise a first array of unit blocks in the first region of the recording surface and a second array of unit blocks in the second region of the recording surface;
- the first array of unit blocks is configured to reconstruct a first image, which is a monotone image having even brightness throughout the first image in at least one monotone reconstruction point;
- the second array of unit blocks is configured to reconstruct a second image, which is a grayscale image having brightness gradation;
- the first image is a monotone reconstruction image having even brightness, and the second image is a grayscale image having brightness gradation;
- a phase component W(x, y) for each unit block of the second array has the following relationship:
- W
-
- (
- kx
- ,
- ky
- )
- =
- ∑
- n
- =
- 0
- N
-
-
- m
-
-
- ax
-
- ∑
- kx
- =
- Y
-
-
- m
-
-
- i
-
-
- n
- Y
-
-
- m
-
-
- ax
-
- ∑
- kx
- =
- X
-
-
- m
-
-
- i
-
-
- n
- X
-
-
- m
-
-
- a
-
-
- x
-
- amp
- ·
- exp
-
- (
- i
-
-
- ϕ
- )
- ϕ
- =
- π
- λ
- ·
- O
- n
-
- (
- z
- )
-
- {
- (
- O
- n
-
- (
- x
- )
- -
- kx
- )
- 2
- +
- (
- O
- n
-
- (
- y
- )
- -
- ky
- )
- 2
- }
- a phase component W(x, y) for each unit block of the first array has the following relationship:
- W
-
- (
- x
- ,
- y
- )
- =
- ∑
- n
- =
- 0
- N
-
-
- m
-
-
- ax
-
- ∑
- kx
- =
- Y
-
-
- m
-
-
- i
-
-
- n
- Y
-
-
- m
-
-
- ax
-
- ∑
- kx
- =
- X
-
-
- m
-
-
- i
-
-
- n
- X
-
-
- m
-
-
- a
-
-
- x
-
- exp
-
- (
- i
-
-
- ϕ
- )
- ϕ
- =
- π
- λ
- ·
- O
- n
-
- (
- z
- )
-
- {
- (
- O
- n
-
- (
- x
- )
- -
- kx
- )
- 2
- +
- (
- O
- n
-
- (
- y
- )
- -
- ky
- )
- 2
- }
- where W(x, y) is a phase component at a coordinate, x and y are coordinates on the recording surface, i is an imaginary number, λ is a wavelength of light at the time of reproducing the image, On(x, y, z) is a central coordinate of the unit block nearest to a coordinate of a respective reconstruction point, (kx, ky, O) is a coordinate of the unit block, ϕ is a phase angle, and amp is grayscale information, wherein the optical film comprises a substrate and a phase angle recording layer on a surface of the substrate, the phase angle recording layer forms the plurality of unit blocks two-dimensionally arrayed in the x and y directions, and the phase angle recording layer in each unit block of the plurality of unit blocks has unevenness that conforms to a respective phase component of the unit block.
228 more elements
Dependencies are inferred from the claim text.