Holographic Display Optics Using Wavelength Multiplexing for Speckle Reduction
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Solution Overview
Problem
Contemporary holographic displays are hindered by speckle noise, which limits accurate reproduction of color and texture in displayed images, and existing optoelectronic materials face limitations in size, weight, refractive index, birefringence, and tunability, restricting device performance and manufacturability.
Innovation Solution
The use of organic solid crystals (OSC) with actively tunable refractive index and birefringence, combined with wavelength multiplexing and dual spatial light modulator architectures, to reduce speckle noise and enhance color gamut in holographic displays, and the integration of metasurface structures in grating light valve devices to improve resolution and actuation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional holographic displays use single-wavelength light sources, then the system is simple, but speckle noise is high and color gamut is limited
Solution Approach 1:
The patent segments the light source into multiple discrete wavelengths (e.g., 400-700nm spectrum divided into several wavelength components). Each wavelength is independently controlled through separate spatial light modulators, allowing independent optimization of speckle reduction and color reproduction for each wavelength component.
Solution Approach 2:
The patent employs composite optical systems combining multiple spatial light modulators (first and second SLMs) with different modulation characteristics. The first SLM modulates one set of wavelengths while the second SLM modulates another set, creating a composite holographic display system that leverages the complementary strengths of each modulator to reduce speckle and expand color gamut.
2Reliability
If organic solid crystals are used with conventional refractive indices, then the material is simple, but optical performance (refractive index, birefringence) is limited
Solution Approach 1:
The patent utilizes organic solid crystals with dynamically tunable refractive indices through external stimulus (e.g., electrical, optical, or chemical fields). The refractive index can be actively adjusted in real-time, enabling dynamic optimization of optical performance for different operating conditions and applications.
Solution Approach 2:
The patent changes the refractive index parameter of the organic solid crystal material through controlled external fields. By adjusting the refractive index and birefringence parameters dynamically, the system achieves both high optical performance and adaptability to different operational requirements.
3Manufacturing precision
If grating light valve devices use conventional structures, then manufacturing is simple, but resolution and actuation speed are limited
Solution Approach 1:
The patent integrates metasurface structures within the grating light valve device architecture, embedding sub-wavelength optical elements within the conventional GLV structure. This nested configuration enables enhanced resolution through the metasurface while maintaining compatibility with existing GLV manufacturing processes.
Solution Approach 2:
The patent combines conventional grating light valve materials with metasurface structures, creating a composite optical device. The metasurface layer is integrated with the GLV substrate, allowing the device to achieve both the actuation capabilities of conventional GLVs and the high resolution benefits of metasurfaces.
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
Speckle reduction is achieved while broadening the color gamut, enhancing display quality and immersive experience through improved angular response and reduced power consumption in holographic displays.
Implementation Method 1
organic solid crystals having an actively tunable refractive index and birefringence
Implementation Method 2
organic solid crystals having an actively tunable refractive index and birefringence
Implementation Method 3
wavelength multiplexing and dual spatial light modulator architectures, to reduce speckle noise
Implementation Method 4
speckle noise, which limits accurate reproduction of color and texture in displayed images
Implementation Method 5
integration of metasurface structures in grating light valve devices to improve resolution
Implementation Method 6
metasurface structures in grating light valve devices to improve resolution and actuation speed
Data Source
AI summary
An OSC material may include a grating structure for use in waveguide applications. A method of patterning the OSC material to create the grating structure may include forming a hard mask over the OSC layer and etching the OSC layer through an opening in the hard mask. Furthermore, an improved design of a grating light valve device may include a reflective backplane, an array of micro-ribbons disposed on the reflective backplane, and a metasurface structure positioned beneath the array of micro-ribbons. A multiple stage process may include generating a broad spectrum of light from a laser architecture, filtering and multiplexing the wavelengths of light using an image optimization module, and incoherently averaging the speckle patterns across the various wavelengths using a spatial light modulator architecture.