LCD Panel Sealant Stop Structures for Edge Mura Control
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Solution Overview
Problem
Conventional LCD panels face issues with edge mura due to uneven thickness of the patterned sealant, leading to inconsistent distances between the TFT array substrate and the color filter substrate, which affects image display quality.
Innovation Solution
The introduction of first and second stop structures and seal spacers within the patterned sealant helps to confine and overflow excessive sealant, ensuring uniform distance between substrates and enhancing sealant viscosity, thereby mitigating edge mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating and pressurizing processes are applied to solidify the unsolidified sealant, then the sealant is solidified and forms the patterned sealant structure, but the viscosity of the sealant is lowered causing it to flow and resulting in uneven thickness
Solution Approach 1:
The patent introduces stop structures and seal spacers before the heating and pressurizing process to pre-establish boundaries that will contain the sealant. These structures are positioned in advance to predict and prevent the flow direction of the sealant under subsequent thermal and pressure treatment, ensuring uniform thickness despite the viscosity changes during solidification.
Solution Approach 2:
The stop structures and seal spacers act as intermediary elements between the substrates and the sealant. They mediate the interaction by providing physical barriers that control sealant distribution, allowing the sealant to be contained uniformly between the stop structures while undergoing the heating and pressurizing process without flowing excessively.
2Ease of manufacture
If the patterned sealant thickness is uneven, then the sealant can be easily formed, but the distance between substrates becomes uneven leading to edge mura phenomenon
Solution Approach 1:
The stop structures and seal spacers are introduced in advance to pre-determine the final thickness and position of the patterned sealant. By establishing these boundary elements before sealant application, the system ensures that the sealant will be contained at a uniform distance from the substrates, preventing edge mura while maintaining ease of formation.
Solution Approach 2:
The stop structures serve as intermediary reference elements that mediate between the sealant formation process and the final substrate spacing requirement. They provide a physical reference that ensures the sealant achieves the correct thickness and position, thereby ensuring uniform substrate distance without complicating the sealant formation process.
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 solution achieves uniformity in the distance between substrates, reducing edge mura and improving image quality by allowing excessive sealant to overflow and adhere to the stop structures, thus solidifying a more consistent patterned sealant.
Implementation Method 1
during the heating process and the pressurizing process, the viscosity of the unsolidified sealant is lowered because of the heat, and flows around under the pressure
Data Source
AI summary
A liquid crystal display (LCD) panel, including a first substrate, a second substrate, a liquid crystal layer, a patterned sealant, several first stop structures, several second stop structures and several seal spacers, is provided. The first substrate is opposite to the second substrate. The liquid crystal layer and the patterned sealant surrounding it are disposed between the first substrate and the second substrate. The first stop structures disposed inside the patterned sealant surround the liquid crystal layer. Each second stop structure disposed inside the patterned sealant is located next to one of the first stop structures. The height H1 of each first or second stop structure is smaller than the distance H2 between the first and second substrates. The seal spacers are disposed inside the patterned sealant and located between the first and the second stop structures. A manufacture method of the LCD panel thereof is further provided.