Cured Resin Layer for Thin Image Display Device
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Solution Overview
Problem
Conventional liquid crystal display apparatuses face issues with reduced contrast and luminance due to light scattering from gaps between the display panel and protective parts, and image defects from resin curing shrinkage, which also hinder the production of thinner display devices.
Innovation Solution
A resin composition with a low curing shrinkage ratio and storage modulus is used to fill the gap between the display and protective parts, ensuring high transmittance and minimizing stress-induced distortion, along with a curable resin composition containing thermal and photopolymerization initiators for thorough curing, especially in regions with shielding parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is formed between the liquid crystal display panel and the protective part, then the surface is protected, but light scattering occurs resulting in decreased contrast and luminance
Solution Approach 1:
The patent removes the gap (disturbing element) between the liquid crystal display panel and protective part by filling it with resin, thereby eliminating light scattering while maintaining surface protection functionality
Solution Approach 2:
The patent introduces resin as an intermediary material to fill the gap between the display panel and protective part, replacing the harmful air gap with a material that provides both protection and optical clarity
2Reliability
If a gap is formed between the liquid crystal display panel and the protective part, then the surface is protected, but the display apparatus becomes thicker
Solution Approach 1:
The patent eliminates the gap (unwanted space) between components by filling it with resin, thereby reducing the overall thickness while maintaining the protective function
3Manufacturing precision
If photocurable resin composition is used to fill the gap, then the gap is filled, but the resin remains uncured in regions where shielding parts are formed due to insufficient light
Solution Approach 1:
The patent changes the curing mechanism from purely photocurable to thermosetting, using thermal energy instead of light to cure the resin in regions blocked by shielding parts, ensuring complete curing throughout
Solution Approach 2:
The patent utilizes the phase transition from liquid resin to solid cured resin through thermal curing, allowing the resin to fully cure even in regions where light cannot reach
4Length of stationary object
If resin is used to fill the gap, then the gap is filled and thickness is reduced, but stress from curing shrinkage causes optical glass plate deformation and image defects
Solution Approach 1:
The patent changes the resin composition parameters to achieve low shrinkage ratio and controlled curing characteristics, preventing stress-induced deformation while maintaining thin profile
Solution Approach 2:
The patent uses a specifically formulated resin composition with low shrinkage properties to fill the gap, combining the benefits of gap elimination with minimal stress and no image defects
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 provides high-luminance, high-contrast displays with minimized image defects, maintaining the structural integrity and thinness of the display apparatus while preventing distortion and ensuring thorough curing of the resin.
Implementation Method 1
a curable resin composition which contains at least a photopolymerization initiator
Implementation Method 2
a curable resin composition which contains at least a thermal polymerization initiator
Data Source
Figure 1~2
Figure 3
Figure 4(a)~4(c)
AI summary
A thin image display apparatus capable of high luminance and high contrast display of a display part, which does not produce display defects resulting from deformation of the image display part. The thin image display apparatus has an image display part 2 and a light-transmitting protective part 3 arranged on the image display part 2. A cured resin layer 5 is arranged between the image display part 2 and the protective part 3. The cured resin layer 5 has a transmittance in the visible region of 90% or higher and a storage modulus at 25°C of 1.0 × 107 Pa or less. The cured resin layer 5 is formed from a resin composition which has a curing shrinkage ratio of 5.0% or less.