Antireflection Layer with Hollow Microparticles for Display Panels
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Solution Overview
Problem
Conventional single-layer antireflection layers for liquid crystal and OLED display devices face challenges in achieving sufficient antireflection performance while maintaining mechanical strength and cost-effectiveness, with existing solutions either compromising on mechanical strength or requiring high manufacturing costs.
Innovation Solution
A liquid crystal display panel and OLED display panel design featuring an antireflection layer composed of inorganic oxide particles, a binder, and voids, with a surface resistance of less than 10^11 Ω, applied directly to the display panel, including layers on the outer and inner surfaces and edge faces, to enhance reflection prevention and mechanical protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer antireflection film is used, then manufacturing cost is reduced and process complexity is simplified, but antireflection performance is insufficient
Solution Approach 1:
The patent employs hollow microparticles with internal cavities as the core component of the antireflection film. These microparticles create a porous structure with air-filled voids that have a refractive index close to air (n=1.0), enabling effective antireflection. The porous structure is formed by incorporating hollow microparticles into a binder resin, creating a film that achieves low refractive index without requiring multiple deposition layers
Solution Approach 2:
The antireflection film is constructed as a composite material combining hollow microparticles (inorganic or organic) with a binder resin. This composite structure allows the film to achieve the desired optical properties (low refractive index) while maintaining mechanical strength and adhesion. The composite approach enables a single-layer film to perform functions that would traditionally require multiple layers
2Reliability
If hollow microparticles are used to achieve low refractive index, then antireflection performance is improved, but mechanical strength of the film deteriorates
Solution Approach 1:
The patent optimizes several key parameters to balance antireflection performance and mechanical strength: (1) hollow microparticle content is controlled at 5-90 wt% of the total film weight, (2) microparticle diameter is specified at 0.1-10 μm, (3) film thickness is set at 1-10 μm, and (4) surface roughness is limited to Ra 0.01-1 μm. These parameter optimizations ensure sufficient light scattering for antireflection while maintaining structural integrity
Solution Approach 2:
The patent creates local quality variations within the film structure through the distribution of hollow microparticles. The microparticles are dispersed throughout the binder resin matrix, creating localized regions of low refractive index surrounded by the stronger binder material. This local quality approach allows the film to achieve antireflection performance in specific regions while the overall film structure maintains mechanical strength through the continuous binder phase
3Reliability
If surface roughness is increased to lower refractive index, then antireflection performance is improved, but manufacturing precision and surface quality deteriorate
Solution Approach 1:
The patent creates a controlled porous structure within the film using hollow microparticles, rather than relying on uncontrolled surface roughness. The internal cavities of the microparticles provide the low refractive index effect through their air-filled voids, while the outer surface of the film can be maintained smooth. This internal porosity approach achieves antireflection performance without compromising surface quality or requiring high surface roughness
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 achieves excellent reflection prevention and mechanical protection for the display panels, reducing manufacturing costs and improving visibility in bright environments while maintaining the structural integrity of the panels.
Implementation Method 1
The antireflection layer with a multi-layer structure is realized by alternately layering films having a high refractive index and films having a low refractive index by deposition methods such as evaporation, sputtering or ion plating
Data Source
AI summary
Provided is a display panel having a high-performance antireflection layer at a low cost.In a liquid crystal display panel or an organic light-emitting diode display panel constituted by a first transparent substrate, a second transparent substrate and a liquid crystal layer between these two transparent substrates further includes an antireflection layer on a portion which is at least one display area and a visible side (outer surface) by a viewer, and layers made of the same material as the antireflection layer formed on at least the opposite side (inside surface) of the surface of the portion corresponding to the display area and on three edge faces.