# US 2021/0240133 A1 · Holographic optical apparatus, holographic optical system, and holographic display system

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- Number: US 2021/0240133 A1
- Document ID: US20210240133A1
- Status: Published application
- Kind: A1
- Application number: 17/262,959
- Filed: 2020-05-25
- Published: 2021-08-05
- Earliest claimed: 2019-05-28
- Assignees: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Xiaoru LIU; Hongshu ZHANG; Jun WU; Xiaoling XU; Hebin ZHAO
- Web page: https://patentgrep.com/patent/US20210240133A1

## CPC

- G03H 1/0402: {Recording geometries or arrangements (G03H1/0443, G03H1/0476, G03H1/16 take precedence)}
- G03H 1/02: Details {of features involved during the holographic process; Replication of holograms without interference recording}
- G03H 1/0248: {Volume holograms}
- G03H 1/26: Processes or apparatus specially adapted to produce multiple {sub-} holograms or to obtain images from them, e.g. multicolour technique
- G03H 1/268: {Holographic stereogram}
- G03H 1/30: discrete holograms only
- G03H 1/2294: {Addressing the hologram to an active spatial light modulator}
- G03H 2001/0216: {Optical components (G03H2001/0224, G03H1/0256 take precedence; corresponding details, see subgroups of G03H2223/00)}
- G03H 2001/0224: {Active addressable light modulator, i.e. Spatial Light Modulator [SLM]}
- G03H 2001/0264: {Organic recording material}
- G03H 2210/22: 2D SLM object wherein the object beam is formed of the light modulated by the SLM
- G03H 2210/30: 3D object
- G03H 2210/454: into planes
- G03H 2222/45: Interference beam at recording stage, i.e. following combination of object and reference beams
- G03H 2223/17: Element having optical power
- G03H 2223/19: Microoptic array, e.g. lens array
- G03H 2223/24: Reflector; Mirror
- G03H 2225/12: 2D SLM
- G03H 2225/22: Electrically addressed SLM [EA-SLM]
- G03H 2225/24: Having movable pixels, e.g. microelectromechanical systems [MEMS]
- G03H 2225/60: Multiple SLMs
- G03H 2260/12: Photopolymer
- G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00})

## Abstract

A holographic optical apparatus includes a beam splitting component, a transmission assembly, a focal length modulation component and an optical element. The beam splitting component splits received light into reference light and signal light that are coherent light, and outputs the reference light and the signal light. The focal length modulation component includes a plurality of local length modulation regions with different focal lengths. The optical element includes a recording medium layer with a plurality of recording regions, and each recording region is located in a light-exit path of a focal length modulation region. The transmission assembly is disposed in a light-exit path of the beam splitting component, transmit the reference light to the plurality of recording regions and transmit the signal light to the plurality of focal length modulation regions.

## Claims

### Claim 1

A holographic optical apparatus, comprising:
a beam splitting component configured to split received light into reference light and signal light, and output the reference light and the signal light, the reference light and the signal light being coherent light;
a focal length modulation component including a plurality of focal length modulation regions, focal lengths of the plurality of focal length modulation regions being different from each other;
an optical element including a recording medium layer, the recording medium layer including a plurality of recording regions, and each recording region being located in a light-exit path of a focal length modulation region; and
a transmission assembly disposed in a light-exit path of the beam splitting component, the transmission assembly being configured to transmit the reference light to the plurality of recording regions, and transmit the signal light to the plurality of focal length modulation regions, wherein
the recording medium layer is configured to receive the signal light after being modulated by the focal length modulation region, and record interference fringes generated by interference between the signal light and the reference light the in the recording region.

### Claim 2 (depends on 1)

The holographic optical apparatus according to claim 1, wherein the transmission assembly includes:
a first transmission portion configured to transmit the reference light to the plurality of recording regions;
a second transmission portion configured to transmit the signal light to part of the plurality of focal length modulation regions; and
a third transmission portion configured to transmit the signal light to a remaining part of the plurality of focal length modulation regions.

### Claim 3 (depends on 2)

The holographic optical apparatus according to claim 2, wherein at least one of the second transmission portion and the third transmission portion includes a first reflecting component and a second reflecting component;
the first reflecting component is configured to receive the signal light exiting from the beam splitting component, and transmit the signal light to the second reflecting component; and
the second reflecting component is a rotatable reflecting component, and the second reflecting component is configured to transmit the received signal light to different focal length modulation regions at different rotation angles.

### Claim 4 (depends on 2)

The holographic optical apparatus according to claim 2, wherein the second transmission portion and the third transmission portion include a same first reflecting component, and the first reflecting component is a rotatable reflecting component; the second transmission portion and the third transmission portion each include a second reflecting component; and
the first reflecting component is configured to receive the signal light exiting from the beam splitting component, transmit the signal light to a second reflecting component in the second transmission portion at a first rotation angle, and transmit the signal light to a second reflecting component in the third transmission portion at a second rotation angle.

### Claim 5 (depends on 4)

The holographic optical apparatus according to claim 4, wherein a number of the focal length modulation regions is four;
the second reflecting component in the second transmission portion is configured to transmit the received signal light to a first focal length modulation region at a third rotation angle, and transmit the received signal light to a second focal length modulation region at a fourth rotation angle; and
the second reflecting component in the third transmission portion is configured to transmit the received signal light to a third focal length modulation region at a fifth rotation angle, and transmit the received signal light to a fourth focal length modulation region at a sixth rotation angle.

### Claim 6 (depends on 3)

The holographic optical apparatus according to claim 3, wherein at least one of the first reflecting component and the second reflecting component is a micro electro-mechanical system micro-mirror.

### Claim 7 (depends on 2)

The holographic optical apparatus according to claim 2, wherein the first transmission portion is a micro electro-mechanical system micro-mirror.

### Claim 8 (depends on 1)

The holographic optical apparatus according to claim 1, wherein the focal length modulation component includes a spatial light modulator;
the spatial light modulator includes an upper substrate, a lower substrate, a liquid crystal layer located between the upper substrate and the lower substrate, a lower polarizer located on a side of the lower substrate away from the upper substrate, and an upper polarizer located on a side of the upper substrate away from the lower substrate; and
the spatial light modulator has a plurality of sub-units, each sub-unit is provided with a first electrode and a second electrode therein, the first electrode is disposed on the lower substrate, and the second electrode is disposed on the lower substrate or the upper substrate.

### Claim 9 (depends on 1)

The holographic optical apparatus according to claim 1, wherein the focal length modulation component includes a lens group; and
the lens group includes a plurality of lenses with different focal lengths, and a region where each lens is located is a focal length modulation region.

### Claim 10 (depends on 1)

The holographic optical apparatus according to claim 1, further comprising:
a collimating beam expander disposed at a light incident side of the beam splitting component; and the collimating beam expander being configured to collimate and expand light directed to the beam splitting component.

### Claim 11 (depends on 1)

The holographic optical apparatus according to claim 1, wherein the recording medium layer is a photosensitive polymer layer.

### Claim 12 (depends on 1)

A holographic optical system, comprising:
a light source; and
the holographic optical apparatus according to claim 1.

### Claim 13 (depends on 12)

The holographic optical system according to claim 12, wherein the light source is a display device or a projection device.

### Claim 14

A holographic display system, comprising a light source, a beam splitting component, a first transmission portion, and an optical element, wherein
the beam splitting component is configured to receive light emitted by the light source and output reference light;
the first transmission portion is disposed in a light-exit path of the beam splitting component; and the first transmission portion is configured to transmit the reference light to the optical element; and
the optical element includes a recording medium layer; the recording medium layer includes a plurality of recording regions, and the recording medium layer is configured to record interference fringes in recording regions.

### Claim 15 (depends on 3)

The holographic optical apparatus according to claim 3, wherein a number of the focal length modulation regions is four;
the second transmission portion and the third transmission portion each include the first reflecting component and the second reflecting component;
the second reflecting component in the second transmission portion is configured to transmit the received signal light to a first focal length modulation region at a third rotation angle, and transmit the received signal light to a second focal length modulation region at a fourth rotation angle; and
the second reflecting component in the third transmission portion is configured to transmit the received signal light to a third focal length modulation region at a fifth rotation angle, and transmit the received signal light to a fourth focal length modulation region at a sixth rotation angle.