OLED Backpanel Supporting Columns for Short Circuit Prevention
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Solution Overview
Problem
In large-size OLED display devices, foreign matters can pierce the cathode or anode during vacuum lamination due to the close distance between them, leading to short circuits and dark spots, which are difficult to prevent with current quality control methods.
Innovation Solution
The introduction of supporting columns with a higher hardness than the surrounding fill layer, positioned between organic electroluminescent elements, which absorb pressure and reduce the likelihood of foreign matter penetration, along with a buffer layer to further protect against sudden pressures and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If vacuum lamination is performed with close distance between cathode and anode to achieve thin structure, then device thickness is reduced, but foreign matters can pierce the membrane causing short circuits and dark spots
Solution Approach 1:
The patent introduces supporting columns before the vacuum lamination process to proactively prevent foreign matter penetration. These columns are positioned in advance to intercept and block foreign matters before they can pierce the cathode or anode membranes during lamination, thus preventing short circuits and dark spots while maintaining the thin device structure.
Solution Approach 2:
The supporting columns act as an intermediary protective element between the foreign matters and the delicate cathode/anode membranes. During vacuum lamination, the columns intercept and block foreign matters, preventing them from directly contacting and piercing the electrode membranes, thus resolving the contradiction between thin structure and short circuit prevention.
2Reliability
If supporting columns with higher hardness than fill layer are introduced to protect against foreign matter penetration, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating supporting columns with higher hardness than the surrounding fill layer only in specific strategic locations where foreign matter penetration is most likely to occur. This localized hardness enhancement provides targeted protection against foreign matter while minimizing the overall structural complexity and material usage compared to making the entire structure harder.
Data Source
AI summary
The present disclosure provides an organic electroluminescent display backpanel, cover and device, wherein the backpanel comprises a backpanel body and a plurality of supporting columns, the backpanel body comprises a substrate and an array of organic electroluminescent elements formed on the substrate, and the supporting column is disposed at a side of the array of organic electroluminescent elements away from the substrate.