Ink Blocking Layer for Display Devices Preventing Resin Penetration
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Solution Overview
Problem
The existing methods for manufacturing ink blocking layers in display devices, such as the Y-Map method, face challenges in controlling the amount of curable resin and ensuring complete curing, leading to penetration of uncured resin into the ink layer, causing visibility issues due to fluidity and permeability problems.
Innovation Solution
A method involving the preparation of an epoxy resin with high crosslinking density using an epoxy monomer with three or more epoxy groups and a curing agent containing an acid and amine, mixed at specific temperatures and times to form a dense polymer structure that prevents penetration of uncured adhesive resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curable resin is applied in a Y-shape and cured with ultraviolet light, then the window can be attached to the display panel, but the uncured resin penetrates into the ink layer causing visibility defects
Solution Approach 1:
An ink blocking layer is introduced as an intermediary barrier between the adhesive layer and the ink layer. This blocking layer prevents uncured resin from penetrating into the ink layer, thereby eliminating ink staining while maintaining the attachment function. The blocking layer acts as a mediator that protects the ink layer from harmful resin penetration.
Solution Approach 2:
The adhesive system is segmented into multiple functional layers: the original adhesive layer for attachment, and a new ink blocking layer with different properties (higher viscosity, light-blocking capability) to prevent resin penetration. This segmentation allows each layer to perform its specific function without interfering with the other.
2Manufacturing precision
If the amount of curable resin is increased to ensure complete coverage, then attachment coverage is improved, but resin overflow and penetration into the ink layer worsens
Solution Approach 1:
Different regions of the adhesive system are assigned different properties: the adhesive layer maintains low viscosity for good wetting and coverage, while the ink blocking layer has high viscosity to prevent overflow and penetration. This local differentiation of material properties allows each layer to optimize its function without causing harmful effects.
Solution Approach 2:
The adhesive system becomes a composite structure combining two materials with complementary properties: a low-viscosity curable resin for attachment and coverage, and a high-viscosity ink blocking layer to prevent overflow and penetration. The composite system leverages the strengths of each material while mitigating their weaknesses.
3Duration of action of stationary object
If ultraviolet light is applied to cure the curable resin, then curing is achieved in exposed areas, but light blocking by driving elements prevents curing in contact regions
Solution Approach 1:
The ink blocking layer is applied beforehand to protect the ink layer from resin penetration. This preliminary protective action is taken before the curing process, ensuring that even if resin remains uncured in contact regions, it cannot penetrate into the ink layer to cause staining.
4Strength
If an epoxy resin with high epoxy equivalent is used, then adhesive strength is improved, but the polymerized structure allows easier penetration of uncured resin
Solution Approach 1:
The adhesive system is segmented into two functional layers with different viscosity characteristics. The adhesive layer uses high epoxy equivalent resin for strength, while the separate ink blocking layer uses high viscosity material to prevent penetration. This segmentation isolates the strength function from the penetration prevention function.
Solution Approach 2:
The ink blocking layer serves as an intermediary barrier that protects the ink layer from penetration by uncured resin, regardless of the adhesive layer's viscosity or strength properties. This mediator layer decouples the strength requirement from the penetration resistance requirement.
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 resulting ink blocking layer effectively prevents the penetration of uncured adhesive resin, reducing the risk of visibility failures and maintaining the integrity of the display device's non-display areas.
Implementation Method 1
an epoxy resin obtained by polymerization of an epoxy monomer having three or more epoxy groups and a curing agent
Implementation Method 2
the curable resin in the portion in contact with the ink layer is partially uncured, and therefore exhibits high fluidity and permeability
Data Source
AI summary
A method of manufacturing an ink blocking layer for a display device, an ink blocking layer for a display device, and a display device are provided. The method of manufacturing an ink blocking layer for a display device includes: preparing a main material including an epoxy monomer having three or more epoxy groups and a curing agent including an acid and an amine; and mixing the main material with the curing agent to prepare an epoxy resin.