Curable Composition for Display Front Plate Strength and Transmittance
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Solution Overview
Problem
The formation of transparent conductive layers on strengthened glass for image display devices reduces the surface strength of the glass and leads to decreased light transmittance due to heat-induced coloration of underlying insulating layers, compromising touch panel sensitivity and display quality.
Innovation Solution
A curable composition containing a compound with an organic group and a siloxane bond is used to form a cured layer between the strengthened glass and the transparent conductive layer, which maintains high transmittance and reduces surface strength loss, comprising at least 80% by mass of the compound based on solid content, with a thickness of 0.1 to less than 5 µm, and includes a metal oxide for refractive index control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive layer is formed on strengthened glass, then touch panel sensitivity is improved, but surface strength of the glass decreases
Solution Approach 1:
An underlying insulating layer made of transparent organic compound is introduced as an intermediary between the strengthened glass and the transparent conductive layer. This insulating layer acts as a buffer that prevents direct contact and mechanical stress concentration at the glass-conductive layer interface, thereby maintaining surface strength while enabling touch panel functionality.
Solution Approach 2:
The structure combines multiple materials with complementary properties: strengthened glass provides mechanical strength, transparent organic compound provides insulation and optical transparency, and transparent conductive layer provides electrical conductivity. This composite structure resolves the contradiction by assigning different functional requirements to different materials.
2Reliability
If underlying insulating layer is used to improve surface strength, then durability is improved, but light transmittance decreases due to heat-induced coloration
Solution Approach 1:
The patent specifies precise parameter ranges for the transparent organic compound: thickness of 0.1 to 5 µm and controlled water content (0.01 to 5 mass%). By optimizing these parameters, the insulating layer achieves sufficient mechanical protection while minimizing optical interference and heat-induced coloration, maintaining high light transmittance.
Solution Approach 2:
The underlying insulating layer is positioned specifically between the glass and conductive layer where it is most needed for mechanical protection, while its optical properties are optimized for the display region. The layer thickness and composition are tailored to provide local functionality without compromising overall optical performance.
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 enhances touch panel sensitivity and maintains high light transmittance by forming a durable cured layer that prevents surface strength reduction and coloration, ensuring improved performance in image display devices.
Implementation Method 1
A curable composition containing a compound with an organic group and a siloxane bond is used to form a cured layer between the strengthened glass and the transparent conductive layer
Implementation Method 2
the formation of transparent conductive layers on strengthened glass for image display devices reduces the surface strength of the glass and leads to decreased light transmittance due to heat-induced coloration of underlying insulating layers
Data Source
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AI summary
A curable composition, for forming a cured layer between a strengthened glass and a transparent conductive layer formed on one side of the glass, that contains a compound having an organic group and a siloxane bond; a transfer film; an image display device front panel; a front panel and sensor assembly; an image display device; and a method for manufacturing an image display device front panel.