Grooved Planarization Layer for Moisture Isolation in TFT LCD Substrates
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Solution Overview
Problem
Conventional thin film transistor liquid crystal display (TFT LCD) devices face accuracy and reliability issues during high-temperature and high-humidity pressure tests due to moisture entering the liquid crystal cell through the planarization layer.
Innovation Solution
A substrate with a planarization layer featuring a groove or notch penetrating through it, where a waterproof material is filled, specifically at the region where the sealant is applied, to prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a planarization layer made of water-absorbing material is applied onto the substrate, then the planarization effect is improved, but moisture enters the liquid crystal cell through the planarization layer during high-temperature and high-humidity pressure tests
Solution Approach 1:
The planarization layer is segmented by grooves that divide it into multiple isolated regions. These grooves create physical barriers that prevent moisture from spreading across the planarization layer, while maintaining the planarization effect in each segmented region.
Solution Approach 2:
A waterproof coating layer is introduced as an intermediary between the planarization layer and the external environment. This coating layer specifically addresses the moisture resistance issue without affecting the planarization function of the underlying layer.
Solution Approach 3:
A waterproof coating film is applied over the planarization layer to create a moisture barrier. This thin film structure maintains the flexibility and planarization properties while adding protective functionality against moisture ingress.
2Manufacturing precision
If the planarization layer covers the entire substrate surface, then the planarization effect is maximized, but it becomes a pathway for moisture to enter the cell
Solution Approach 1:
The continuous planarization layer is segmented into isolated regions by grooves. This segmentation maintains planarization coverage where needed while creating moisture barrier pathways that prevent moisture from traversing the entire substrate surface.
Solution Approach 2:
Different regions of the substrate are given different properties: areas requiring planarization have the planarization layer, while groove regions are designed for moisture barrier functionality. This local differentiation resolves the contradiction between coverage and moisture protection.
3Reliability
If a waterproof coating layer is added over the planarization layer, then moisture resistance is improved, but the device structure becomes more complex
Solution Approach 1:
The waterproof coating layer is merged with the planarization layer structure by applying it directly over the grooved planarization surface. This integration approach adds moisture protection while minimizing the increase in structural complexity.
Solution Approach 2:
The planarization layer serves multiple functions: it provides surface planarization for manufacturing precision and, when combined with the waterproof coating, also provides a substrate for moisture barrier functionality. This multi-functionality reduces the need for separate dedicated layers.
Data Source
AI summary
The present disclosure provides a substrate, a display panel and manufacturing methods thereof. The substrate includes a substrate body and a planarization layer arranged on the substrate body. The substrate is provided at a surface facing a liquid crystal layer with a groove or notch penetrating through the planarization layer, at least a portion of the groove or notch is located at a region where a sealant is applied, and a waterproof material is filled within the groove or notch.