Luminescent Sealant for LCD Panel Curing Uniformity
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Solution Overview
Problem
The existing sealants used in the cell-assembly process of TFT-LCD panels suffer from poor curing uniformity, leading to defects like leakage and liquid crystal pollution, as the surface is often fully cured while the inside remains uncured or incompletely cured, requiring prolonged UV irradiation which reduces curing efficiency and increases production time.
Innovation Solution
Incorporating luminescent particulates, such as Sr2MgSi3O9:Ce3+, Tb3+, Sr2B5O9Cl:Ce3+, LiSr4(BO3)3:Tb3+, or NaSr4(BO3)3:Tb3+, into the sealant matrix that emit UV light under irradiation, allowing for simultaneous inside and surface curing, improving uniformity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sealant curing method is used, then surface curing is achieved, but inside curing is insufficient leading to poor curing uniformity
Solution Approach 1:
The patent divides the curing function into two segments: surface curing by external UV light and internal curing by luminescent particulates that convert UV to visible light for deep penetration. This segmentation allows simultaneous surface and internal curing, resolving the contradiction between surface curing effectiveness and internal curing completeness.
Solution Approach 2:
Luminescent particulates act as intermediaries that absorb UV light and convert it to visible light, which then penetrates deeper into the sealant to initiate polymerization. This intermediary mechanism enables uniform curing throughout the sealant thickness without compromising either surface or internal curing quality.
2Manufacturing precision
If prolonged UV irradiation is applied, then inside curing is improved, but curing time increases reducing productivity
Solution Approach 1:
The curing process is segmented into two concurrent pathways: external UV irradiation for surface curing and internally generated visible light from luminescent particulates for deep curing. This parallel segmentation eliminates the need for prolonged irradiation, maintaining high productivity while achieving uniform curing.
Solution Approach 2:
The luminescent particulates are pre-distributed throughout the sealant matrix before curing. When UV light strikes, they immediately begin converting UV to visible light, creating an internal light source that acts in advance to ensure complete internal curing without extending overall curing time.
3Ease of manufacture
If conventional sealant is used, then manufacturing process is simple, but defects like leakage and liquid crystal pollution occur
Solution Approach 1:
The patent creates a composite sealant material by incorporating luminescent particulates into the sealant matrix. This composite structure maintains the simplicity of the original sealant application process while adding the functional benefit of improved curing uniformity, thereby eliminating defects without complicating manufacturing.
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 use of luminescent particulates ensures improved curing uniformity and efficiency by emitting UV light to cure both the inside and surface of the sealant, reducing curing time and preventing defects, thereby enhancing productivity.
Implementation Method 1
The luminescent particulates are configured to at least emit ultraviolet (UV) light under UV irradiation
Data Source
AI summary
A sealant, a manufacturing method therefor, a liquid crystal display (LCD) panel and a display device are provided. The sealant includes a sealant matrix and luminescent particulates distributed in the sealant matrix. The luminescent particulates at least emit ultraviolet (UV) light under UV irradiation.