Backlight Unit Protection Layer for Scratch Resistance
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Solution Overview
Problem
Liquid crystal display devices face reduced display quality due to scratches and environmental factors like moisture and oxygen penetrating into the backlight unit, damaging the color control layer and affecting image quality.
Innovation Solution
A backlight unit with a protection layer made from a resin composition including specific repeating units and silica particles, disposed in the outermost region to prevent scratches and environmental damage, combined with a color control layer using quantum dots and a low refraction layer for improved light transmission and color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color control layer is exposed in the backlight unit, then the manufacturing process is simplified, but the display quality deteriorates due to scratches and environmental damage
Solution Approach 1:
A protection layer made of a flexible resin composition is formed over the color control layer to protect it from scratches and environmental damage. The protection layer is disposed in the outermost region of the backlight unit, creating a protective shell that maintains display quality while allowing the color control layer to remain exposed for manufacturing simplicity.
Solution Approach 2:
The protection layer uses a composite resin composition containing polysilsesquioxane repeating units and silica particles. This composite material provides enhanced mechanical strength and scratch resistance while maintaining optical transparency, thus protecting the color control layer without compromising display quality.
2Reliability
If the color control layer is protected from environmental factors, then reliability is improved, but the structural complexity increases
Solution Approach 1:
A single thin protection layer is formed over the color control layer to protect it from scratches, moisture, and oxygen. This thin film approach provides environmental protection while minimizing the increase in structural complexity, as it adds only one functional layer rather than multiple complex protective structures.
Solution Approach 2:
The protection layer serves multiple functions simultaneously: it protects against scratches, blocks moisture and oxygen penetration, and maintains optical transparency for display quality. This multi-functionality reduces the need for separate protective layers for each function, thereby limiting the increase in structural complexity.
3Reliability
If a protection layer is added to prevent scratches, then reliability is improved, but the light transmission efficiency may deteriorate
Solution Approach 1:
A thin protection layer is formed over the color control layer to protect it from scratches. The thin film design minimizes the impact on light transmission efficiency while providing adequate scratch resistance. The layer is thin enough to allow most light to pass through while still offering protective coverage.
Solution Approach 2:
The protection layer uses a composite resin composition containing polysilsesquoxane repeating units and silica particles that provides high mechanical strength and scratch resistance. The composite material is designed to be transparent in the visible spectrum, ensuring that light transmission efficiency is maintained while achieving the desired scratch protection.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A backlight unit which includes a light guiding layer having an incident surface on which light is incident and an exit surface from which light is emitted, a light source disposed on the incident surface of the light guiding layer and configured to generate the light, a low refraction layer disposed on the exit surface of the light guiding layer, a color control layer disposed on the low refraction layer, and a protection layer disposed on the color control layer. The protection layer includes a resin composition including a first repeating unit represented by Formula 1: