Curable Resin Composition for Low Refractive Index Display Coatings
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Solution Overview
Problem
Existing technologies face challenges in creating a low refractive index coating layer that is thick enough to provide efficient light recycling while maintaining high transparency, crack resistance, and mechanical strength, especially when used in display devices with complex patterns.
Innovation Solution
A curable resin composition comprising a silicon-containing polymer represented by Chemical Formula 1, hollow particles, and a solvent, which can be cured at low temperatures to form a thin layer with a low refractive index, high transparency, and excellent mechanical properties, including high indentation hardness and crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of the low-refractive coating layer is increased to provide efficient light recycling, then luminous efficiency is improved, but crack resistance deteriorates
Solution Approach 1:
The patent uses a composite material system comprising a silicon-containing polymer matrix combined with hollow particles (such as hollow silica or air bubbles). This composite structure achieves a refractive index of 1.30 or less while maintaining high crack resistance through the synergistic effect of the polymer matrix and the hollow particles, which act as stress distributors and crack arrestors.
Solution Approach 2:
The patent incorporates hollow particles with internal cavities into the coating layer, creating a porous or cellular structure. These hollow particles reduce the overall refractive index of the coating material while simultaneously improving crack resistance by providing void spaces that prevent crack propagation and distribute mechanical stresses throughout the material.
2Loss of energy
If the thickness of the coating layer is increased to provide efficient light recycling, then luminous efficiency is improved, but transparency deteriorates
Solution Approach 1:
The silicon-containing polymer composite with hollow particles achieves a refractive index of 1.30 or less, which minimizes light scattering and refraction at interfaces. This low refractive index maintains high transparency even at coating thicknesses of 5 μm or more, allowing efficient light transmission while preserving the light recycling function.
3Loss of energy
If the refractive index of the low-refractive coating layer is reduced, then light recycling efficiency is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent creates a composite material where the silicon-containing polymer provides mechanical strength and structural integrity, while the incorporated hollow particles reduce the refractive index. The polymer matrix acts as a binding phase that maintains mechanical properties even as the refractive index is reduced through the addition of low-density hollow particles.
Solution Approach 2:
The hollow particles are distributed throughout the polymer matrix to locally reduce the refractive index in specific regions, while the continuous polymer matrix maintains the overall mechanical strength. This local modification of material properties allows the coating to have low refractive index where needed for light recycling while preserving mechanical strength through the polymer framework.
4Loss of energy
If the thickness of the coating layer is increased to provide efficient light recycling, then luminous efficiency is improved, but the margin of the coating layer decreases
Solution Approach 1:
The silicon-containing polymer composite achieves a refractive index of 1.30 or less, which provides excellent light recycling efficiency even at minimal coating thicknesses of 5 μm or more. This high efficiency per unit thickness means that the coating can be made very thin while still achieving the desired optical performance, thereby maximizing the thickness margin for other device requirements.
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 curable resin composition achieves a low refractive index of less than 1.35, low haze, high indentation hardness of greater than 0.12 GPa, and improved crack resistance, even at thicknesses of 5 μm or more, making it suitable for use in display devices with complex patterns without cracking.
Implementation Method 1
the curable resin composition may have excellent optical characteristics, e.g., low refractive index... The lower the refractive index of the low-refraction coating layer, the lower the thickness of the coating layer
Implementation Method 2
a curable resin composition including a silicon-containing polymer... which may have high mechanical properties, e.g., high indentation hardness... excellent adhesion to upper and lower films
Implementation Method 3
The hollow particles may have an average porosity of about 40% to about 90%... improved crack resistance, even at thicknesses of 5 μm or more
Data Source
AI summary
A curable resin composition, a thin layer manufactured from the curable resin composition, a color conversion panel including the thin layer, and a display device including the thin layer, the curable resin composition including a silicon-containing polymer represented by Chemical Formula 1, hollow particles, and a solvent:(R4R5R6SiO1/2)M(R7R8SiO2/2)D(R9SiO3/2)T1(SiO3/2—Y—SiO3/2)T2(SiO4/2)Q [Chemical Formula 1].