Light Diffraction Film for Wearable Displays
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Solution Overview
Problem
Conventional methods using microlens array sheets or anti-glare sheets in wearable displays improve visibility of pixel grids but compromise image clarity and often cause glare due to uneven refraction.
Innovation Solution
A light diffraction film with a transparent substrate and a light diffraction layer containing a binder resin and particles, where the particles are arranged in an in-plane direction with a specific regularity and refractive index ratio, covering 70-90% of the substrate surface, to reduce pixel grid visibility and prevent glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a microlens array sheet or anti-glare sheet is used to improve pixel grid visibility, then the pixel grid becomes less visually recognized, but image clearness deteriorates and glare occurs
Solution Approach 1:
The patent changes the particle size parameter to a specific range (1-10 μm) and controls the coverage ratio (70-90%) to optimize the balance between pixel grid suppression and image clarity. This parameter optimization allows the light diffraction film to reduce pixel visibility while maintaining image quality without the glare problems of conventional anti-glare sheets
Solution Approach 2:
The patent uses a composite structure consisting of a transparent substrate combined with a light diffraction layer containing particles dispersed in a binder resin. This composite material approach enables the film to simultaneously achieve light diffusion for pixel grid suppression and maintain optical clarity, avoiding the glare issues of homogeneous anti-glare materials
2Object-affected harmful factors
If an anti-glare sheet with irregularly arranged surface asperities is used to reduce pixel grid visibility, then the pixel grid is less recognized, but glare occurs on images
Solution Approach 1:
The patent applies local quality by creating controlled optical properties at the particle level within the light diffraction layer. The particles are distributed to provide localized light diffusion effects that suppress pixel grids while the overall layer structure maintains uniform optical properties to prevent glare, unlike the irregular surface asperities of conventional anti-glare sheets
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 effectively prevents pixel grid recognition, maintains high image clarity, and minimizes glare in wearable displays with magnifying optical systems.
Implementation Method 1
a light diffraction layer containing a binder resin and particles... in which an average primary particle diameter of the particles is 1 μm to 10 μm... provided that a refractive index of the particles is np and a refractive index of the binder resin is nb, a refractive index ratio nb/np is equal to or higher than 1.03 and equal to or lower than 1.09
Data Source
AI summary
A light diffraction film includes a transparent substrate; and a light diffraction layer containing a binder resin and particles, in which an average primary particle diameter of the particles is 1 μm to 10 μm, and a coverage of a surface of the transparent substrate covered with the particles is 70% to 90%.