# US 11,079,720 B2 · Holographic display system

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- Number: US 11,079,720 B2
- Document ID: US11079720B2
- Status: Granted
- Kind: B2
- Application number: 16/405,857
- Filed: 2019-05-07
- Published: 2020-11-12
- Granted: 2021-08-03
- Earliest claimed: 2019-05-07
- Assignees: National Taiwan University; Himax Technologies Limited
- Applicants: National Taiwan University; Himax Technologies Limited
- Inventors: Chien-Yu Chen; Chih-Hao Chuang; Hoang-Yan Lin
- Web page: https://patentgrep.com/patent/US11079720B2

## CPC

- G03H 1/2202: {Reconstruction geometries or arrangements}
- G02B 27/0172: {characterised by optical features}
- G03H 1/0005: {Adaptation of holography to specific applications (holographic optical element G02B5/32; holographic scanner G02B26/106; recognition using holographic mask G06V10/88; holographic memories G11B7/0065, G11C13/042)}
- G03H 1/2205: {using downstream optical component}
- G03H 1/2294: {Addressing the hologram to an active spatial light modulator}
- G03H 1/32: Systems for obtaining speckle elimination
- G02B 2027/0174: {holographic}
- 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 2001/2284: {Superimposing the holobject with other visual information}
- G03H 2223/22: Polariser
- G03H 2223/50: Particular location or purpose of optical element
- G03H 2223/54: Filtering the holobject information
- G03H 2225/32: Phase only
- G03H 2225/60: Multiple SLMs
- 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})
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A holographic display system includes a light source that emits coherent light; a lateral displacement beam splitter that optically receives the coherent light and generates first reference light and second reference light; a first spatial light modulator (SLM) and a second SLM that optically receive the first reference light and the second reference light respectively, and construct first phase-only function (POF) light and second POF light respectively; a first beam splitter and a second beam splitter that optically receive the first POF light and the second POF light respectively, and generate first split light and second split light respectively; and a plurality of polarizers disposed between the first SLM and the first beam splitter, and between the second SLM and the second beam splitter, respectively.

## Claims

### Claim 1

A holographic display system, comprising:
a light source that emits coherent light;
a lateral displacement beam splitter that optically receives the coherent light and generates first reference light and second reference light;
a first spatial light modulator (SLM) and a second SLM that optically receive the first reference light and the second reference light respectively, and construct first phase-only function (POF) light and second POF light respectively;
a first beam splitter and a second beam splitter that optically receive the first POF light and the second POF light respectively, and generate first split light and second split light respectively; and
a first polarizer disposed between the first SLM and the first beam splitter, and a second polarizer disposed between the second SLM and the second beam splitter.

### Claim 2 (depends on 1)

The system of claim 1, wherein the light source comprises a laser light source.

### Claim 3 (depends on 1)

The system of claim 1, further comprising:
an adjust unit disposed between the light source and the lateral displacement beam splitter, the adjust unit adjusting the coherent light to plane wave, thereby generating adjusted light.

### Claim 4 (depends on 3)

The system of claim 3, wherein the adjust unit comprises a spatial filter that optically receives the coherent light and generates filtered light by removing aberrations in the coherent light.

### Claim 5 (depends on 4)

The system of claim 4, wherein the adjust unit comprises a convex lens that optically receives the filtered light and generates the adjusted light.

### Claim 6 (depends on 1)

The system of claim 1, further comprising:
a reflector disposed between the light source and the lateral displacement beam splitter, the reflector optically receiving the coherent light and generating reflection light, which is optically received by the lateral displacement beam splitter.

### Claim 7 (depends on 1)

The system of claim 1, further comprising:
a first reflector disposed between the lateral displacement beam splitter and the first SLM; and
a second reflector disposed between the lateral displacement beam splitter and the second SLM.

### Claim 8 (depends on 1)

The system of claim 1, further comprising a third polarizer disposed between the lateral displacement beam splitter and the first SLM, and a fourth polarizer disposed between the lateral displacement beam splitter and the second SLM.

### Claim 9 (depends on 1)

The system of claim 1, wherein the first beam splitter and the second beam splitter comprise cube beam splitters.

### Claim 10 (depends on 1)

The system of claim 1, wherein the first polarizer and the second polarizer each comprise a linear polarizer.

### Claim 11

An augmented reality (AR) holographic display system disposed in a head-mounted display device, the system comprising:
a laser light source that emits coherent light;
a reflector that optically receives the coherent light and generates reflection light;
a lateral displacement beam splitter that optically receives the reflection light and generates first reference light and second reference light;
a first spatial light modulator (SLM) and a second SLM that optically receive the first reference light and the second reference light respectively, and construct first phase-only function (POF) light and second POF light respectively;
a first reflector disposed between the lateral displacement beam splitter and the first SLM;
a second reflector disposed between the lateral displacement beam splitter and the second SLM;
a first beam splitter and a second beam splitter that optically receive the first POF light and the second POF light respectively, and generate first split light and second split light respectively; and
a first polarizer disposed between the first SLM and the first beam splitter, a second polarizer disposed between the second SLM and the second beam splitter, a third polarizer disposed between the first reflector and the first SLM, and a fourth polarizer disposed between the second reflector and the second SLM.

### Claim 12 (depends on 11)

The system of claim 11, further comprising:
an adjust unit disposed between the laser light source and the reflector, the adjust unit adjusting the coherent light to plane wave, thereby generating adjusted light.

### Claim 13 (depends on 12)

The system of claim 12, wherein the adjust unit comprises a spatial filter that optically receives the coherent light and generates filtered light by removing aberrations in the coherent light.

### Claim 14 (depends on 13)

The system of claim 13, wherein the adjust unit comprises a convex lens that optically receives the filtered light and generates the adjusted light.

### Claim 15 (depends on 11)

The system of claim 11, wherein the first beam splitter and the second beam splitter comprise cube beam splitters.

### Claim 16 (depends on 11)

The system of claim 11, wherein the first polarizer, the second polarizer, the third polarizer and the fourth polarizer each comprise a linear polarizer.