UV Curable Adhesive for Flexible Display Thermal Deformation
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Solution Overview
Problem
There is a need for a method to manufacture flexible display devices with high resolution characteristics while preventing thermal deformation during the manufacturing process.
Innovation Solution
The method involves preparing a display panel with a base substrate, an encapsulation layer, and an organic light emitting device, attaching a support layer using an adhesive layer that includes an acryl-based compound, a UV-curable compound, and a photoinitiator, and curing the adhesive layer with UV light to achieve high storage modulus and prevent thermal deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used to manufacture display devices, then portability and flexibility are improved, but thermal deformation occurs during the manufacturing process
Solution Approach 1:
A support layer is introduced as an intermediary component between the flexible substrate and the manufacturing environment. This support layer provides thermal stability and mechanical strength during the manufacturing process, preventing thermal deformation of the flexible substrate while allowing the final flexible display device to maintain its flexibility after the support layer is removed
Solution Approach 2:
The adhesive layer undergoes parameter changes through UV irradiation, transitioning from a liquid state with low viscosity to a solid state with high storage modulus. This parameter change allows the adhesive to provide adequate bonding strength while maintaining flexibility, resolving the contradiction between flexibility and thermal stability
2Ease of manufacture
If conventional adhesive layers are used, then ease of manufacture is improved, but thermal deformation occurs and resolution characteristics are reduced
Solution Approach 1:
The adhesive layer's physical and chemical parameters are changed through UV irradiation, transforming it from a soft, deformable state to a rigid, stable state. This parameter change enables the adhesive to maintain high resolution characteristics and prevent thermal deformation while still being easy to apply in the liquid state
Solution Approach 2:
The adhesive layer is formulated as a composite material containing acryl-based compounds, UV curable compounds, and photoinitiators. This composite structure combines the ease of application of liquid adhesives with the thermal stability and high resolution characteristics of cured adhesives, resolving the contradiction between ease of manufacture and manufacturing precision
3Reliability
If UV curable adhesive with high storage modulus is used, then thermal deformation is prevented and reliability is improved, but device complexity increases
Solution Approach 1:
The adhesive layer achieves high storage modulus through UV irradiation-induced parameter changes rather than through complex formulation. The photoinitiators in the adhesive composition enable this parameter change when exposed to UV light, providing thermal stability and reliability without significantly increasing device complexity
Solution Approach 2:
The mechanical bonding provided by conventional adhesives is replaced with UV-cured chemical bonding. This substitution provides superior thermal stability and reliability while maintaining relatively simple adhesive composition and application processes
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 enables the production of display devices with superior reliability and high resolution, as well as reduced thermal deformation, allowing for the use of micro-pitch bump electrodes and improved durability.
Implementation Method 1
curing the adhesive layer through irradiation of UV light; The adhesive layer includes an acryl-based compound, a UV curable compound, and a photoinitiator
Data Source
AI summary
A method for manufacturing a display device, includes preparing a display panel including a base substrate, an encapsulation layer facing the base substrate, and an organic light emitting device formed between one surface of the base substrate and the encapsulation layer, attaching a support layer to the other surface of the base substrate through an adhesive layer, curing the adhesive layer through irradiation of UV light, and mounting a driving chip on one surface of the display panel. The adhesive layer includes an acryl-based compound, a UV curable compound, and a photoinitiator.