Display Panel Column Spacer Protrusion for Moisture Barrier
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Solution Overview
Problem
Current display panels face issues with moisture intrusion through openings in the base substrates, leading to display defects like hole black spots due to lateral moisture entry, which affects the encapsulation quality and overall product quality.
Innovation Solution
A display panel design featuring a column spacer with a first metal structure, an insulating layer, and a second metal structure laminated on the base substrate, where the light-emitting layer is broken at the column spacer, and a first inorganic encapsulation layer covers the display area, forming a protruding structure to enhance the encapsulation effect and prevent moisture intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If grooves are formed by digging edges of photosensitive areas to force common layers to break, then lateral moisture intrusion is prevented, but vertical moisture intrusion path increases and encapsulation quality deteriorates
Solution Approach 1:
The patent applies local quality by creating different structures in different regions: the column spacer structure is specifically designed in the transition area to provide enhanced moisture barrier function where it is most needed, while maintaining the integrity of the light-emitting layer in the display area. This localized structural enhancement prevents lateral moisture intrusion without compromising overall encapsulation quality.
Solution Approach 2:
The column spacer employs composite material structure with multiple layers (first inorganic encapsulation layer, organic encapsulation layer, second inorganic encapsulation layer) to achieve superior moisture barrier performance. This multi-material composite approach provides both lateral and vertical moisture protection while maintaining encapsulation quality.
2Object-affected harmful factors
If grooves are formed to prevent moisture intrusion, then lateral moisture barrier is improved, but moisture accumulation in base substrate materials occurs
Solution Approach 1:
The column spacer acts as an intermediary structure between the base substrate and the light-emitting layer. It provides a controlled interface that prevents both lateral moisture intrusion and vertical moisture accumulation by directing moisture away from the base substrate materials while maintaining structural integrity.
Solution Approach 2:
The invention addresses moisture protection by adding a vertical dimension with multiple encapsulation layers (first inorganic, organic, second inorganic) in the column spacer structure. This multi-layer vertical arrangement prevents moisture accumulation by creating multiple barrier planes, effectively blocking moisture paths in both lateral and vertical directions.
3Adaptability or versatility
If grooves are formed with inconsistent structures, then manufacturing flexibility is increased, but encapsulation effect deteriorates and hole blackboard phenomenon increases
Solution Approach 1:
The patent employs parameter changes by precisely controlling the dimensions and properties of the column spacer layers (thicknesses of first and second inorganic encapsulation layers, organic encapsulation layer, and their material compositions). This systematic parameter optimization ensures consistent encapsulation quality while allowing manufacturing flexibility through adjustable parameters within defined ranges.
Data Source
AI summary
A display panel and a display device are provided. The display device includes a photosensitive device and the display panel. The display panel includes a base substrate, a driver circuit layer, a column spacer, a light-emitting layer, and a first inorganic encapsulation layer forming a protruding structure corresponding to the column spacer to increase thickness of the first inorganic encapsulation layer, so that an encapsulation effect of the first inorganic encapsulation layer is improved and a risk of moisture intrusion into a display area which renders a light-emitting material failed can be reduced.