Hologram Medium Surface Energy Optimization
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Solution Overview
Problem
Hologram recording media face challenges with light loss due to reflection, scattering, and absorption caused by light-transmissive substrates, and struggle to achieve high refractive index modulation and diffraction efficiency, especially at thin thicknesses, limiting their application in VR and AR devices.
Innovation Solution
A hologram medium with a surface energy of 50 mN/m or more, utilizing polymers like triacetyl cellulose, alicyclic olefin, and polyethylene terephthalate, which allows easy peeling from substrates without damaging surface properties, and features a silane-based functional group in the polymer resin for improved refractive index modulation and diffraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a light-transmissive substrate is used to support the photopolymer layer, then mechanical strength and structural stability are improved, but light loss due to reflection, scattering, and absorption increases
Solution Approach 1:
The patent extracts and removes the light-transmissive substrate from the hologram recording medium structure. By creating a free-standing photopolymer layer without substrate support, the invention eliminates the source of light loss (reflection, scattering, absorption by substrate) while maintaining the essential hologram recording function through the photopolymer layer's inherent mechanical properties
Solution Approach 2:
The patent changes the surface energy parameter of the photopolymer layer to 50 mN/m or more, which fundamentally alters the layer's adhesion characteristics. This parameter change enables the photopolymer layer to maintain structural integrity and handleability without requiring a light-transmissive substrate, thereby eliminating substrate-induced light loss
2Reliability
If the photopolymer layer thickness is increased to achieve higher refractive index modulation, then diffraction efficiency is improved, but the device becomes heavier and larger
Solution Approach 1:
The patent changes the surface energy parameter to enable thin-film stability without substrate support, allowing optimization of layer thickness for maximum diffraction efficiency while maintaining handling integrity. This enables achieving high refractive index modulation in thinner layers without the penalty of substrate weight
Solution Approach 2:
Instead of increasing thickness to achieve required diffraction efficiency, the patent inverts the approach by optimizing the photopolymer composition and surface energy characteristics to achieve high diffraction efficiency at reduced thickness, thereby minimizing device weight and size
3Adaptability or versatility
If the photopolymer layer thickness is decreased to reduce device size, then angular selectivity is improved, but refractive index modulation value decreases
Solution Approach 1:
The patent employs composite material strategies by optimizing the photopolymer composition with specific polymers (triacetyl cellulose, alicyclic olefin polymer, polyethylene terephthalate) and controlling surface energy at 50 mN/m or more. This composite approach enhances refractive index modulation in thin layers through improved material properties and interfacial characteristics, allowing simultaneous achievement of high angular selectivity and sufficient refractive index modulation
Solution Approach 2:
By changing the surface energy parameter to 50 mN/m or more, the patent enables thin photopolymer layers to maintain structural integrity and optimize optical properties. This parameter change allows the system to achieve both thin-film characteristics (high angular selectivity) and sufficient refractive index modulation through enhanced material-performance relationships
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
The solution enables higher refractive index modulation and diffraction efficiency, reduces light loss, and allows for lighter, smaller products by eliminating substrates, enhancing performance in VR and AR applications.
Implementation Method 1
the photosensitive film produced from such a composition is irradiated with laser interference light to induce photopolymerization of local monomers
Implementation Method 2
the refractive index modulation occurs, and a diffraction grating is generated by such refractive index modulation
Implementation Method 3
a diffraction grating is generated by such refractive index modulation
Data Source
AI summary
The present disclosure relates to a hologram recording medium having one surface with a higher surface energy than a polymer resin layer containing at least one polymer selected from the group consisting of triacetyl cellulose, alicyclic olefin polymer and polyethylene terephthalate, a hologram recording medium wherein the surface energy of any one surface is 50 mN/m or more, and an optical element comprising the hologram medium.