Stereoscopic Hologram - KNU3dot.knu.ac.kr/.../05/Talk5_Stereoscopic-Hologram.pdfStereoscopic...

3 Dimensional Optical Technology 3DOT

Stereoscopic Hologram

Joonku Hahn

Kyungpook National University

Outline:

1. Introduction

- Basic structure of holographic display

- Wigner distribution function

2. Design of ‘Stereoscopic Hologram’

- Optical design concept

- Viewing window

- Spatial light modulator

3. Examples of ‘Stereoscopic Hologram’

- Holographic display with a large-scale SLM

- Projection-type holographic display

- Head-mounted holographic display

4. Summary

1. Introduction

Available structure of holographic display

Electrically

addressable

Spatial Light

Modulator

Coherent

Source

Optics Optics Observer Screen Optical

filter

Scanner Optically

addressable

Spatial Light

Modulator

(optional) (optional)

1. Introduction

Transfer lens

Focal plane

0 order

diffraction

-1 order diffraction

on v-axis

+1 order diffraction

on v-axis

Local viewing angle

Spherical phase

resulting from

Amplitude contour

by sinc function

Pixels of SLM

Central direction of

local viewing angle

2 22 Area of image Numerical Aperture wavelength .u v u vN M W W

Space-bandwidth product

J. Hahn, H. Kim, Y. Lim, G. Park, and B. Lee, Optics Express 16, pp. 12372-12386, (2008).

2 2Data capacity Area of screen Field of view wavelength Color depth

Space-Bandwidth Product

Data capacity

Wigner distribution function

After a Fresnel transform After a Fourier transform

The area in the Wigner distribution function is equal to the space-bandwidth product.

A. W. Lohmann, R. G. Dorsch, D. Mendlovic, Z. Zalevsky, and C. Ferreira, J. Opt. Soc. Am. A 13, 470-473 (1996).

1. Introduction

Hologram plane

Viewing window plane

Definition of the planes in holographic display

1. Introduction

Holographic Stereogram vs. Stereoscopic Hologram

Holographic

Stereogram

Stereoscopic

Hologram

1. Introduction

Viewing window plane Hologram plane

20inch

10inch

View volume defined

by 4K-resolution hologram 40inch

View volume defined

by 2K-resolution hologram

View volume defined

by 8K-resolution hologram

Stereoscopic Hologram

Transverse resolution at screen

Width of viewing window at pupil of eye

1.8 8.2 @ 0.5VW

w m p mm m

Hologram plane

Viewing window

Basic geometry of stereoscopic holographic display

Large-aperture SLM

Viewing windowLight source

Hologram plane

Display with a large-aperture SLM

Viewing window

Spot size of undiffracted light needs to be small enough for fear of disturbing the signal

which is modulated by spatial light modulator.

Small-aperture SLM

Viewing window

Light source

Projection optics

with a pair of parabolic mirrors Hologram plane

Projection-type display

‘Real image’

Types and properties of SLM

Liquid crystal display

(LCD) modulator

Digital micro-mirror device

(DMD) modulator

Acousto-optic modulator

Liquid crystal on Silicon

(LCoS) modulator

Amplitude-only modulation

Phase-only modulation

Full-complex modulation

Typical characteristic

of liquid crystal device

1( )G f

maxf maxf

2 ( )G f

maxf maxff

3( )G f

maxf maxf

0 ( )G f

maxfmaxf

(a) (b)

(c) (d)

Off-axis complex hologram encoding with amplitude-only modulation

C.-Y. Hwang, K.-S. Kim, B.-R. Lee, S. Oh, H. Kim, and J. Hahn, “Off-axis complex hologram encoding with amplitude-only modulation,” Opt. Express

submitted.

SLM planeViewing

window plane

Focal plane

1d 2 1d f 3d 4d 5d

Image plane

1f 2f 3f

Structure for off-axis complex hologram encoding with amplitude-only modulation

Head-mount display

Light source

Viewing window Eyepiece

Hologram plane

‘Virtual image’

Optical design

Holographic display with a large-scale SLM

Layout

EYE Tracking Beamsplitter

Large-scale

Spatial Light Modulator

Array of Point Light Sources

Hologram Calculation

I/O ports

Main Control

Input Optics

Structure according to functions

Spatial light modulators

Input integrated optics

Motorized stages with

light sources array

Control boards Large-format beam splitter

1800mm500mm

182mm144mm

4.55deg

, ,in in inx y z , ,out out outx y z

z=-500mm z=1800mm

Light engines

Optics for projection

Holographic display

Viewing windows

Parabolic mirrors

Mirrors

FT lenses

Projection-type holographic display

Optical design Layout

Collimators

Left part Right part

X-cube prism

Laser diode modules Red

Blue Red

Mirrors

FT lensesFilters

Collimators

X-cube prism

Laser diode modules

Laser diode module

Polarizer

PinholePlate spring

Objective lensCollimation lens

Adjustable tube

Red Green Blue

Projection-type holographic display

Light engine

10inch screen

Simulation Experiment

Focused

at the screen

Focused

0.9m away

from the screen

Head-mounted holographic display

Optical design

Layout

Control box

with light sources

Holographic display

for head-mounted application

Multimode optical fiber

Data cable

Multimode

optical fiber

Data cable

Beamsplitter

at viewing window Blue LED

Green LEDRed LED

Multimode

optical fiber

Control board

y-axis [mm]

Complex optical field on retina

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

y-axis [mm]

-1 -0.5 0 0.5 1

Simulation Experiment

(625nm)

(528nm)

(462nm)

@1125mm @725mm @1125mm @725mm

4. Summary

Stereoscopic hologram has a great potential to display large field through a narrow

viewing windows.

Optical design of stereoscopic hologram has three possible geometries. The first

applies a large-aperture SLM and the second displays a real image of the SLM. The

last displays a virtual image of the SLM.

We succeeded in constructing several interesting systems under the cooperation

with Prof. Kim’s group in Korea University.

I N T E G R A T E D P H O T O N I C D E V I C E S & S Y S T E M S L A B

3 Dimensional

Optical

Technology

Stereoscopic Hologram - KNU3dot.knu.ac.kr/.../05/Talk5_Stereoscopic-Hologram.pdfStereoscopic...

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