KR20170083865A - Holographic display device with wide viewing angle - Google Patents
Holographic display device with wide viewing angle Download PDFInfo
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- KR20170083865A KR20170083865A KR1020160003294A KR20160003294A KR20170083865A KR 20170083865 A KR20170083865 A KR 20170083865A KR 1020160003294 A KR1020160003294 A KR 1020160003294A KR 20160003294 A KR20160003294 A KR 20160003294A KR 20170083865 A KR20170083865 A KR 20170083865A
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- 238000000034 method Methods 0.000 claims abstract description 36
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- 230000001427 coherent effect Effects 0.000 claims abstract description 26
- 230000001131 transforming effect Effects 0.000 claims description 7
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- 238000007906 compression Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 238000001093 holography Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000011069 regeneration method Methods 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0443—Digital holography, i.e. recording holograms with digital recording means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/16—Processes or apparatus for producing holograms using Fourier transform
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H2001/0208—Individual components other than the hologram
- G03H2001/0224—Active addressable light modulator, i.e. Spatial Light Modulator [SLM]
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2240/00—Hologram nature or properties
- G03H2240/50—Parameters or numerical values associated with holography, e.g. peel strength
- G03H2240/61—SLM related parameters, e.g. pixel size
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2240/00—Hologram nature or properties
- G03H2240/50—Parameters or numerical values associated with holography, e.g. peel strength
- G03H2240/62—Sampling aspect applied to sensor or display
Abstract
The present invention relates to a holographic display device having an enlarged viewing angle, and a holographic display device includes a light source for outputting coherent parallel light, a hologram for subjecting the image signal to under-sampling using the output coherent parallel light, And a reconstruction optical unit for reconstructing the Fourier transformed hologram signal using a Wiener filter, wherein the hologram signal is a coarse image signal, and the image reconstruction optical unit includes a Wiener filter And restores the coarse image signal by a least squares method using a filter.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device, and more particularly, to a holographic display device having an enlarged viewing angle and a method for enlarging the viewing angle.
A holographic display is an imaging device capable of spatially reproducing a three-dimensional image, and provides a realistic stereoscopic image unlike a conventional planar image. However, it is very difficult to reproduce sufficient-sized stereoscopic images at a sufficient viewing angle with current technology. Generally, the size and viewing angle of the reproduced image depends on the hologram space bandwidth. The spatial bandwidth is determined by the resolution of the hologram display element. Therefore, in order to reproduce a very large stereoscopic image at a wide viewing angle, a sufficiently large spatial light modulator must be manufactured using pixels having a size of less than a micrometer. Liquid crystal display (LCD) or digital micro-mirror device (DMD) panels, which are currently used as hologram display devices, have a viewing angle of only 1 degree to less than 2 degrees.
Even when a spatial light modulator having a pixel size of less than a micrometer is developed, an enormous amount of hologram data must be processed in order to secure a realistic reproduction image size. Therefore, it is still difficult to realize a holographic display device capable of reproducing a large stereoscopic image with a wide viewing angle by developing a high resolution hologram display element or by a conventional technique of spatially or temporally multiplexing a spatial light modulator.
Therefore, in order to commercialize such a holographic display device, it is necessary to develop a display device capable of increasing the viewing angle of a hologram reproduced image while efficiently handling hologram image data with current data processing technology.
Recently, a digital holography technique for numerically restoring a hologram image using a compressed sensing technique capable of perfectly restoring an original signal even with a signal sampling less than a Nyquist sampling frequency is actively researched. In principle, the holographic tomogram can be completed only when enough information is obtained. On the other hand, if the compression sensing algorithm is applied, the image can be reconstructed with less information sampling. However, in the field of compressive holography using the compression sensing principle, it is required to apply it to the optical regeneration method.
The present invention provides a holographic display device and a viewing angle enlarging method capable of enlarging the viewing angle.
A holographic display device according to an embodiment of the present invention includes a light source unit for outputting coherent parallel light, a Fourier transform unit for Fourier-transforming and outputting a hologram signal obtained by under-sampling the image signal using the output coherent parallel light, And an image reconstruction optical unit for reconstructing the Fourier transformed hologram signal using a Wiener filter, wherein the hologram signal is a coarse image signal, and the image reconstruction optical unit converts the coarse image signal using the Wiener filter Restore by least squares method.
As an embodiment, the Fourier transform optics may include a spatial light modulator for performing complex amplitude spatial light modulation on the coherent parallel light and outputting the same, a sampling mask for sampling the complex amplitude spatial light modulated coherent parallel light with a predetermined resolution, And a first Fourier lens for Fourier transforming the sampled coherent parallel light to generate a two-dimensional hologram image on a first focal plane.
In an embodiment, the size of the unit pixel of the sampling mask is smaller than the size of the unit pixel of the spatial light modulator.
In an embodiment, the spatial light modulator and the sampling mask are integrally formed with each other.
In an embodiment, the spatial light modulator and the sampling mask are located on a second focal plane of the first Fourier lens.
In an embodiment, the spatial light modulator performs a spatial light modulating operation by phase modulating or amplitude modulating the coherent parallel light
In an embodiment, the light source unit outputs the coherent parallel light using one of red, green, and blue laser devices or a light emitting diode self-emitter.
In an embodiment, the image restoration optics includes a Wiener filter for filtering and outputting the hologram signal, which is the coarse image signal, using a least squares method, and a second Fourier lens for reproducing the filtered hologram signal as a three-dimensional hologram image .
In an embodiment, the Wiener filter is located on a first focal plane of the second Fourier lens.
In an embodiment, when the video signal is not a sparse video signal, the video signal is converted into a sparse video signal through wavelet transformation, and inverse wavelet transform is applied to the sparse video signal to restore the video signal. .
In an embodiment, the inverse wavelet transform optic includes a third Fourier lens, a fourth Fourier lens, and an inverse wavelet transform filter, wherein the inverse wavelet transform filter is arranged on a common focal plane of the third Fourier lens and the fourth Fourier lens Located.
A holographic display device according to an embodiment of the present invention includes a light source unit for outputting coherent parallel light, a spatial light modulator for modulating and outputting the output coherent parallel light by complex amplitude spatial light modulation, A first fourier lens for Fourier transforming the sampled coherent parallel light to generate a two-dimensional hologram image on a first focal plane, a second fourier lens for generating a two-dimensional hologram image on the first focal plane, And a second Fourier lens for reproducing the filtered two-dimensional hologram image as a three-dimensional hologram image, wherein the spatial light modulator and the sampling mask are integrally formed with each other, And is located on the first focal plane of the first Fourier lens.
In an embodiment, the Wiener filter is located on a common focal plane of the first Fourier lens and the second Fourier lens.
In an embodiment, the size of the unit pixel of the sampling mask is smaller than the size of the unit pixel of the spatial light modulator.
In an embodiment, the two-dimensional hologram image is composed of coarse image signals.
According to the present invention, by reproducing a hologram image using a Wiener filter manufactured on the basis of a numerically optimized system matrix, it is possible to reproduce a hologram stereoscopic image even with hologram information sampled with a smaller pixel size, The viewing angle of the apparatus can be increased.
1 is a view illustrating an exemplary size and viewing angle of a hologram image according to a pixel size of a spatial light modulator.
2 is a block diagram illustrating an exemplary viewing angle enlarging holographic display device in an embodiment of the present invention.
FIG. 3 is a view showing a more specific configuration of the viewing angle enlarging holographic display device of FIG. 2. FIG.
FIG. 4 illustrates an exemplary sampling mask according to an embodiment of the present invention. Referring to FIG.
FIG. 5 is a flowchart illustrating an exemplary method of optically reproducing a hologram image using the hologram information sampled through the sampling mask of FIG.
6 is a view illustrating a viewing angle enlarging holographic display device according to another embodiment of the present invention.
The foregoing features and the following detailed description are exemplary of the invention in order to facilitate a description and understanding of the invention. That is, the present invention is not limited to these embodiments, but may be embodied in other forms. The following embodiments are merely examples for the purpose of fully disclosing the present invention and are intended to convey the present invention to those skilled in the art. Thus, where there are several ways to implement the components of the present invention, it is necessary to make it clear that the implementation of the present invention is possible by any of these methods or any of the equivalents thereof.
FIG. 1 is an exemplary view illustrating a size and a viewing angle of a hologram image according to a pixel size of a spatial light modulator. Referring to FIG. Generally, spatial light modulators are used in holographic display panels for reproduction of hologram images. The hologram image is generated by the diffraction phenomenon of the incident light (CPW) incident on the hologram fringe pattern. Therefore, in the holographic display device using the digital device, the diffraction angle of the unit pixel PIX of the
Also, when a panel element having a high resolution, that is, a small unit pixel size is developed, for example, in order to reproduce a hologram image of 10 cm x 10 cm in size at a viewing angle of 30 degrees (VW), a spatial light modulator . That is, even when a high-resolution panel element is developed, very large data must be processed for hologram image reproduction. In addition, since the size of the hologram image and the viewing angle VW are in a trade-off relationship with each other, there is also a limitation in enlarging the size of the hologram image using the imaging optical system.
The present invention is intended to provide a display device and a viewing angle increasing method thereof that can enlarge the viewing angle of a holographic display device even with less data processing. To this end, according to the present invention, it is possible to provide a holographic display technology capable of viewing a hologram three-dimensional image of a sufficient size with a wider viewing angle by applying a compression sensing principle to a conventional spatial light modulator.
FIG. 2 is a block diagram illustrating an exemplary viewing angle-enlarging holographic display device according to an exemplary embodiment of the present invention, and FIG. 3 is a diagram illustrating a more specific configuration of the viewing angle-increasing holographic display device of FIG. 2 and 3, a
The digital hologram signal is generated using Fresnel propagation expressed as a convolution of the video signal g and a spatial impulse response k. Here, the space impulse response (k) is (1 / jλz) exp (jkz ) exp [(jk / 2z) (x 2 + y 2)] a. Here, x, y, and z mean three-dimensional coordinate values, respectively. At this time, the spatial impulse response acts as a convolution kernel for the image signal g. When the above-described convolution is expanded and arranged for the Fresnel hologram (u), u = Fg can be expressed. Here, F means a Fresnel transform matrix. Since the Fresnel transform matrix F is a well-formed matrix generated using Fresnel propagation, it is possible to reconstruct the original image signal g using the linear matrix equation, that is, u = Fg.
When the number of samples of the digital hologram pixel information is made smaller in the linear matrix equation, that is, when a matrix is formed by selecting any row smaller than the number of columns in the sampling matrix, an underdetermined linear system . The Fresnel transform matrix satisfies a restricted isometry property (RIP) condition that can solve the L1-norm optimization problem, for example, a Gaussian random matrix. Therefore, the under-determined linear system can perfectly restore the original image signal by using a method of finding the image information in a sufficiently coarse signal image or a region transformed into a sparse region such as wavelet transformation. By defining the sparse area transformation matrix P and the sparse area image signal? And expressing the matrix product F? As a system matrix? Of the linear matrix system, The linear matrix system becomes a minimization problem of min ∥h - Φα∥ + ∥α∥, L1-norm.
The present invention is to apply the principle of numerical image restoration to an optical image reproducing method. That is, a system matrix is numerically optimized using an orthogonal matching pursuit algorithm, a Wiener filter is manufactured using an optimized system matrix, and an optically least squares solution is obtained Thereby restoring the hologram stereoscopic image. The system matrix is a matrix including geometric structure information necessary for reconstructing a three-dimensional image.
The
The Fourier transform
The spatial
The
The
Here, the spatial
The image restoration
The
The
FIG. 4 illustrates an exemplary sampling mask according to an embodiment of the present invention. Referring to FIG. Referring to FIG. 4, the
The
Illustratively, by arranging the pixel arrays of the
FIG. 5 is a flowchart illustrating an exemplary method of optically reproducing a hologram image using the hologram information sampled through the sampling mask of FIG. Referring to FIG. 5, a method of reproducing a hologram image according to an exemplary embodiment of the present invention includes a step S110 of designing a sampling mask, a
In step S110, the sampling resolution of the hologram information is determined to design a sampling mask. The resolution of the sampling can be variously determined according to the situation in consideration of the resolution of the hologram image, the data processing speed of the holographic display device, the processing capacity, and the like.
In step S120, a system matrix for undersampling the hologram image signal using the designed sampling mask is generated.
In step S130, the system matrix is optimized using an orthogonal matching permutation algorithm. For example, an orthogonal matching permutation algorithm such as min ∥h - Φα∥ 2 + ∥α∥ 1 described above is used to numerically optimize the system matrix.
In step S140, the Wiener filter is designed using the optimized system matrix. In other words, the Wiener filter is designed to minimize the mean square error of the input signal and the desired output signal using the optimized system matrix.
In step S150, a hologram image is reproduced using the designed Wiener filter. In other words, the hologram image is reproduced using a combination of the spatial
According to the holographic image reproducing method of FIG. 5, the viewing angle of the reproduced holographic image can be enlarged. This is because the viewing angle of the reproduced hologram image is represented by the diffraction angle with respect to the size of the pixel, the subpixel of the
6 is a view illustrating a viewing angle enlarging holographic display device according to another embodiment of the present invention. 5, a view angle enlarging
If the original image to be optically reproduced by the
The inverse wavelet
The
In addition, the holographic display device can reproduce a color holographic image by applying a time multiplexed reproduction method and a spatial multiplexed reproduction method through an RGB optical system.
In the holographic display device according to the embodiment of the present invention, the optical system is not limited to the above-described structure, and may be modified and used as an appropriate optical system capable of achieving the same effect as that known to a person skilled in the art have.
The configurations shown in the respective conceptual diagrams should be understood from a conceptual viewpoint only. In order to facilitate understanding of the present invention, the shape, structure, size, etc. of each of the components shown in the conceptual diagram have been exaggerated or reduced. The configuration actually implemented may have a physical shape different from that shown in the respective conceptual diagrams. Each conceptual diagram is not intended to limit the physical form of the component.
The device configurations shown in the respective block diagrams are intended to facilitate understanding of the invention. Each block may be formed of blocks of smaller units depending on the function. Alternatively, the plurality of blocks may form a block of a larger unit depending on the function. That is, the technical idea of the present invention is not limited to the configuration shown in the block diagram.
The present invention has been described above with reference to the embodiments of the present invention. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Accordingly, the above embodiments should be understood in an illustrative rather than a restrictive sense. That is, the technical idea that can achieve the same object as the present invention, including the gist of the present invention, should be interpreted as being included in the technical idea of the present invention.
Therefore, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. The scope of protection of the present invention is not limited to the above embodiments.
10, 121, 321; Spatial light modulator
100, 300: holographic display device
110, 310:
122: Sampling mask 123: First Fourier lens
130, 330: Image restoration optical unit 131: Wiener filter
132: second Fourier lens 340: inverse wavelet transform optical part
Claims (15)
A Fourier transform optical unit for Fourier transforming and outputting a hologram signal obtained by under-sampling a video signal using the output coherent parallel light; And
And a reconstruction optical unit for reconstructing the Fourier transformed hologram signal using a Wiener filter,
Wherein the hologram signal is a coarse image signal, and the image restoration optics restores the coarse image signal using the Wiener filter by a least squares method.
Wherein the Fourier transform optics comprises:
A spatial light modulator for complex-amplitude-space-modulating the coherent parallel light and outputting the modulated light;
A sampling mask for sampling the complex amplitude spatial light modulated coherent parallel light at a predetermined resolution; And
And a first fourier lens for Fourier transforming the sampled coherent parallel light to generate a two-dimensional hologram image on a first focal plane.
Wherein a size of a unit pixel of the sampling mask is smaller than a size of a unit pixel of the spatial light modulator.
Wherein the spatial light modulator and the sampling mask are integrally formed with each other.
Wherein the spatial light modulator and the sampling mask are located on a second focal plane of the first Fourier lens.
Wherein the spatial light modulator performs a spatial light modulation operation by phase modulating or amplitude modulating the coherent parallel light.
Wherein the image restoration optics comprises:
A Wiener filter for filtering and outputting the hologram signal, which is a coarse image signal, using a least squares method; And
And a second fourier lens for reproducing the filtered hologram signal as a three-dimensional hologram image.
Wherein the Wiener filter is located on a first focal plane of the second Fourier lens.
Wherein the light source unit outputs the coherent parallel light using one of red, green, and blue laser devices or a light emitting diode self-luminous.
And an inverse wavelet transform optical unit for transforming the video signal into a sparse video signal through wavelet transformation and performing inverse wavelet transform on the transformed sparse video signal to restore the video signal when the video signal is not a sparse video signal A holographic display device.
Wherein the inverse wavelet transform optic includes a third Fourier lens, a fourth Fourier lens, and an inverse wavelet transform filter,
Wherein the inverse wavelet transform filter is located on a common focal plane of the third Fourier lens and the fourth Fourier lens.
A spatial light modulator for complex-amplitude-space-modulating the output coherent parallel light and outputting the modulated light;
A sampling mask for sampling the complex amplitude spatial light modulated coherent parallel light at a predetermined resolution;
A first fourier lens for generating a two-dimensional hologram image on a first focal plane by Fourier transforming the sampled coherent parallel light;
A Wiener filter for filtering and outputting the two-dimensional hologram image using a least squares method; And
And a second fourier lens for reproducing the filtered two-dimensional hologram image as a three-dimensional hologram image,
Wherein the spatial light modulator and the sampling mask are integrally formed without a distance from each other and are located on a first focal plane of the first Fourier lens.
Wherein the Wiener filter is located on a common focal plane of the first Fourier lens and the second Fourier lens.
Wherein a size of a unit pixel of the sampling mask is smaller than a size of a unit pixel of the spatial light modulator.
Wherein the two-dimensional holographic image comprises a coarse image signal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200119716A (en) | 2019-04-10 | 2020-10-20 | 한국전자통신연구원 | Method and apparatus for displaying binocular hologram image |
| US11392086B2 (en) | 2019-10-23 | 2022-07-19 | Electronics And Telecommunications Research Institute | Hologram display device and method for manufacturing the same |
| US11573529B2 (en) | 2019-12-11 | 2023-02-07 | Electronics And Telecommunications Research Institute | Holographic optical system structure and holographic display apparatus using spatial light modulator |
| US11619825B2 (en) | 2019-04-10 | 2023-04-04 | Electronics And Telecommunications Research Institute | Method and apparatus for displaying binocular hologram image |
-
2016
- 2016-01-11 KR KR1020160003294A patent/KR20170083865A/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200119716A (en) | 2019-04-10 | 2020-10-20 | 한국전자통신연구원 | Method and apparatus for displaying binocular hologram image |
| US11619825B2 (en) | 2019-04-10 | 2023-04-04 | Electronics And Telecommunications Research Institute | Method and apparatus for displaying binocular hologram image |
| US11392086B2 (en) | 2019-10-23 | 2022-07-19 | Electronics And Telecommunications Research Institute | Hologram display device and method for manufacturing the same |
| US11573529B2 (en) | 2019-12-11 | 2023-02-07 | Electronics And Telecommunications Research Institute | Holographic optical system structure and holographic display apparatus using spatial light modulator |
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