Light Conversion Particles for Display Window Reflection Control
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Solution Overview
Problem
Display devices face challenges in reducing total reflection and improving light efficiency, particularly in window members, where existing solutions do not effectively address these issues.
Innovation Solution
The implementation of light conversion particles or fibers with specific refractive indices and irregular arrangements on the surface of window panels to prevent total reflection and enhance light efficiency, using materials like nanoparticles or nanofibers that can be cured by light and/or heat, and are made of acryl-based or vinyl-based polymers with additives for improved mechanical strength and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a smooth window member surface is used, then manufacturing is simple and surface finish is good, but total reflection occurs and light efficiency decreases
Solution Approach 1:
The window member surface is segmented into multiple regions with light conversion particles distributed across different areas. Each particle acts as an independent light conversion unit, collectively reducing total reflection through distributed refraction rather than a single complex structure.
Solution Approach 2:
Light conversion particles are selectively applied to specific regions of the window member surface where total reflection occurs. The particles have specific refractive indices matched to local requirements, creating non-uniform local optical properties that address reflection issues without complicating the entire surface structure.
2Loss of energy
If light conversion particles are added to the window member, then total reflection is reduced and light efficiency improves, but manufacturing complexity increases
Solution Approach 1:
Light conversion particles are pre-synthesized with controlled sizes and refractive indices before being applied to the window member. This preliminary preparation allows for standardized processing and simplifies the final assembly process, as particles are ready-to-use components rather than requiring in-situ fabrication.
Solution Approach 2:
A binder or adhesive layer serves as an intermediary between the light conversion particles and the window member surface. This intermediary facilitates easy application and uniform distribution of particles during manufacturing, reducing the complexity of directly bonding particles to the surface.
3Illumination intensity
If irregularly shaped particles are used, then light refraction is improved without scattering, but manufacturing precision requirements increase
Solution Approach 1:
The refractive index of light conversion particles is precisely controlled as a key parameter to match specific wavelengths of light. By optimizing this physical parameter, particles can achieve effective refraction with simpler shape control requirements, balancing optical performance with manufacturing feasibility.
Solution Approach 2:
Light conversion particles are created as composite structures combining materials with different refractive indices. This composite approach enables tailored optical properties that improve refraction efficiency while allowing more flexible manufacturing tolerances for particle shape and size.
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
This approach effectively reduces total reflection and enhances light efficiency by refracting light without scattering, improving the overall performance of display devices and preventing the light conversion elements from functioning as diffraction gratings.
Implementation Method 1
The light conversion particles are converted into a hemispherical shape upon collision with the window panel, and thus the light conversion particles may serve to prevent or reduce total reflection in the window panel by refracting light
Implementation Method 2
A refractive index of the light conversion particles may be similar to a refractive index of the window panel
Data Source
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AI summary
A display device includes: a display panel including a plurality of display elements; a window member disposed on the display panel; and a plurality of first light conversion members that convert the path of light emitted from the display elements and whose cross sections are about 450 nm to about 950 nm in diameter, wherein the first light conversion members directly contact a surface of the window member.