Holographic Display Spatial Light Modulator Composite Hologram

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Solution Overview

Problem

Holographic display technologies face limitations as they require replacing the holographic plate for each image displayed, restricting the ability to show multiple images without interference.

Innovation Solution

A holographic display device utilizing a spatial light modulator that loads composite holograms formed by superposing multiple sub-holograms, with a light source comprising multiple components whose emergent light directions are adjusted to match the reference waves of the sub-holograms, allowing for simultaneous and independent reproduction of multiple images without plate replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single holographic plate is used to display multiple images, then the display complexity is reduced, but the images interfere with each other and cannot be displayed independently

Engineering Contradiction:
Improveholographic plate replacement operationVSAvoidimage independence
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent divides a single holographic plate into multiple virtual sub-plates through computational segmentation. Each sub-hologram is calculated to correspond to a specific viewing angle or user position, allowing multiple independent images to be encoded on one physical plate without mutual interference.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces angular dimensionality by calculating sub-holograms for different viewing angles. This transforms the traditional 2D holographic display into a 3D angular space where each user position receives a dedicated sub-hologram, enabling multiple independent images simultaneously.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Reliability

If multiple holographic plates are used to display different images simultaneously, then image independence is achieved, but the device complexity and operation difficulty increase

Engineering Contradiction:
Improveimage independenceVSAvoidholographic plate management
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple virtual holographic plates into a single physical plate by computationally encoding multiple sub-holograms on one substrate. This consolidation maintains image independence while eliminating the need for physical plate replacement or management.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The single holographic plate becomes multi-functional by simultaneously displaying multiple independent holographic images for different users or viewing angles. The plate serves multiple purposes that traditionally required separate physical plates.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If traditional holographic display is used, then the holographic plate can be replaced for different images, but the display efficiency and flexibility are limited

Engineering Contradiction:
Improvedisplay flexibilityVSAvoiddisplay efficiency
Core Design Contradiction:
Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent performs preliminary computational processing to generate multiple sub-holograms and encode them on a single plate before actual display. This advance preparation enables rapid switching between different holographic images without physical plate replacement, improving display efficiency.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent enables dynamic selection and activation of different sub-holograms from the single plate based on real-time viewing angle detection or user position. This dynamic control provides flexibility in displaying different images while maintaining high efficiency through electronic switching rather than mechanical plate replacement.

Inventive Principle:
Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables the display of multiple images without replacing the holographic plate, improving display efficiency and flexibility, allowing multiple users to view different holographic images simultaneously with richer content.

Implementation Method 1

one of the at least one composite hologram is formed by superposing N sub-holograms

Methodology Applied
Scientific EffectSuperposition:

Implementation Method 2

the spatial light modulator is configured to load at least one composite hologram

Methodology Applied
Scientific EffectDiffraction: Diffraction

Implementation Method 3

the direction of propagation of emergent light of each of at least two light source components among the M light source components being identical to the direction of propagation of a reference wave

Methodology Applied
Scientific EffectLight propagation: Light

Data Source

PatentUS10802442B2Holographic display device and driving method thereof, and display cabinet
Publication Date: 2020.10.13 BOE TECHNOLOGY GROUP CO LTD
  • US10802442B2 patent drawing
  • US10802442B2 patent drawing
  • US10802442B2 patent drawing

AI summary

A holographic display device is provided, comprising a spatial light modulator. The spatial light modulator is configured to load at least one composite hologram, and one of the at least one composite hologram is formed by superposing N sub-holograms. The holographic display device further comprises a light source arranged on a light incoming side of the spatial light modulator. The light source is configured to provide readout light to the spatial light modulator. The light source comprises M light source components. The direction of propagation of emergent light of each of at least two light source components among the M light source components is identical to the direction of propagation of a reference wave corresponding to one of the N sub-holograms, wherein M≥N≥2, and M and N are positive integers.