Liquid Crystal Display Substrate Bonding via Photopolymerization
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Solution Overview
Problem
In liquid crystal display devices, the curvature or folding leads to changes in the thickness of the liquid crystal layer and positional shifts of substrates, resulting in decreased display quality due to the time-consuming diffusion-based polymerization process used for bonding substrates.
Innovation Solution
The implementation of spacers with protrusions and a resin component that bonds the substrates together, allowing for faster polymerization of monomer particles exposed to ultraviolet light, thereby maintaining the distance between substrates and preventing shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer is used to form a connection portion that bonds and secures the two substrates to each other through diffusion-based polymerization, then the substrates are securely bonded, but the time required to form the polymer is significantly long
Solution Approach 1:
The patent changes the polymerization method from diffusion-based to photopolymerization by introducing a photopolymerizable monomer and UV irradiation. This parameter change transforms the bonding process from a time-consuming diffusion mechanism to a rapid light-driven polymerization, achieving strong substrate bonding within seconds while maintaining reliability
Solution Approach 2:
The patent replaces the diffusion-based chemical process with a photopolymerization process. By substituting the slow diffusion mechanism with UV-light-induced polymerization, the system achieves rapid bonding without compromising the strength of the connection between substrates
2Adaptability or versatility
If the liquid crystal display device is curved or folded to achieve flexibility, then the display can be adapted to various forms, but the thickness of the liquid crystal layer changes and substrate positional shifts occur, decreasing display quality
Solution Approach 1:
The patent introduces spacers with protrusions that extend into the liquid crystal layer before the device is curved or folded. These pre-positioned spacers maintain the correct substrate distance and alignment even when the device is bent, preventing display quality degradation while preserving flexibility
Solution Approach 2:
The spacers act as intermediary elements between the substrates and the liquid crystal layer. When the device is curved or folded, these spacers mediate the mechanical stress, maintaining substrate positioning and preventing shifts that would otherwise occur during flexible deformation
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 solution shortens the time required for polymer formation, maintains the thickness and alignment of the liquid crystal layer, and enhances the display quality by preventing substrate shifts during curvature or folding.
Implementation Method 1
a polymerization reaction of the monomer, which is ultraviolet-polymerizable, is started when the monomer is irradiated with ultraviolet light. By the influence of the resultant concentration variance in the monomer, the monomer is condensed in a part exposed to the ultraviolet light
Implementation Method 2
since the manner of the monomer moving to the part exposed to the ultraviolet light is by diffusion, the time required to form the polymer is significantly long
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer between the first substrate and the second substrate, the liquid crystal layer being enclosed by a sealing member, a first protrusion in one of the first substrate and the second substrate in a region inner to the sealing member, the first protrusion protruding toward the other of the first substrate and the second substrate, and a resin component bonding the other of the first substrate and the second substrate and the first protrusion to each other.