Display Adhesive Member Manufacturing Through Two-Stage UV Curing
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Solution Overview
Problem
Existing methods for manufacturing adhesive members for display devices do not effectively enhance adhesive strength, which is crucial for the durability and performance of display devices.
Innovation Solution
A method involving the use of a preliminary resin layer with a photopolymerization initiator having a specific absorption wavelength range, followed by irradiation with a first ultraviolet light of a different wavelength to form an intermediate resin layer, and then with a second ultraviolet light within the absorption wavelength range to create an adhesive member, allowing for controlled polymerization and increased chain length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single ultraviolet light source is used to irradiate the resin layer, then the manufacturing process is simple, but the adhesive strength is insufficient
Solution Approach 1:
The ultraviolet irradiation process is segmented into two distinct stages using different wavelength ranges. The first irradiation uses UV light in a wavelength range that does not overlap with the photopolymerization initiator's absorption peak, while the second irradiation uses UV light within the absorption peak range. This segmentation allows controlled polymerization to achieve higher adhesive strength without requiring complex single-stage irradiation systems.
Solution Approach 2:
The first ultraviolet irradiation serves as a preliminary action that partially initiates the polymerization process and prepares the resin layer for subsequent complete curing. This preliminary irradiation creates an intermediate state that enables better adhesion properties, while the second irradiation completes the polymerization. This two-stage approach achieves superior adhesive strength compared to single-stage irradiation.
2Strength
If rapid polymerization is achieved through high-energy ultraviolet irradiation, then productivity increases, but polymer chain length decreases reducing adhesive strength
Solution Approach 1:
The polymerization process is conducted in periodic stages with different ultraviolet wavelength irradiations. The first irradiation stage uses UV light that partially activates the photopolymerization initiator, allowing slower polymer chain growth that produces longer chains and better adhesion. The second irradiation stage completes the polymerization. This periodic action resolves the contradiction between speed and chain length by separating these functions across time.
Solution Approach 2:
The irradiation wavelength parameter is changed between two distinct ranges to control the polymerization process. The first irradiation uses a wavelength range that provides moderate activation energy, promoting longer polymer chain formation. The second irradiation uses a wavelength range within the photopolymerization initiator's absorption peak for complete curing. This parameter change strategy achieves both adequate polymerization speed and long chain length for high adhesive strength.
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
This approach improves the adhesive strength of the adhesive member, enhancing the durability and performance of display devices by ensuring slow decomposition of the photopolymerization initiator, resulting in longer polymer chains.
Implementation Method 1
providing a preliminary resin layer including a photopolymerization initiator having a maximum absorption wavelength in a first wavelength range; forming an intermediate resin layer by irradiating the preliminary resin layer with a first ultraviolet light having a wavelength different from the first wavelength range; and forming an adhesive member by irradiating the intermediate resin layer with a second ultraviolet light having a wavelength within the first wavelength range
Data Source
AI summary
A method of manufacturing an adhesive member includes: providing a preliminary resin layer including a photopolymerization initiator having a maximum absorption wavelength in a first wavelength range; forming an intermediate resin layer by irradiating the preliminary resin layer with a first ultraviolet light having a wavelength different from the first wavelength range; and forming an adhesive member by irradiating the intermediate resin layer with a second ultraviolet light having a wavelength within the first wavelength range.