Display Panel Row Bank Height Variation for Film Thickness Control
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Solution Overview
Problem
Conventional display panels face challenges in suppressing variation in film thickness of organic functional layers and preventing the spread of defective organic light-emitting elements due to defective column banks, which affects the brightness and lifespan of organic light-emitting elements.
Innovation Solution
A display panel design featuring a combination of low and high row banks with varying numbers and configurations to equalize ink amounts and prevent ink spread, where the number of high row banks is adjusted based on the sensitivity of each organic light-emitting element's material to film thickness variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the row bank height is made lower than the column bank height to equalize ink amounts in adjacent sub pixel regions, then variation in film thickness of organic light-emitting layers is suppressed, but ink of different colors can penetrate through defective portions of column banks and spread to multiple sub pixel regions
Solution Approach 1:
The patent applies local quality by differentiating row bank heights based on their functional requirements: low row banks (lower than column banks) are used in regions where ink equalization is critical, while high row banks (equal to column banks) are used in regions where defect containment is critical. This spatial variation in row bank height allows simultaneous optimization of both ink uniformity and defect containment across different areas of the display panel.
Solution Approach 2:
The patent segments the row banks into two distinct types (high and low) with different heights, allowing the system to address multiple conflicting requirements through differentiated structures. This segmentation enables low row banks to facilitate ink flow for uniformity while high row banks provide containment barriers for defect isolation.
2Object-affected harmful factors
If the row bank height is made equal to the column bank height to block ink flow and limit defective element spread, then ink penetration through defective portions is contained, but variation in film thickness of organic light-emitting layers increases due to blocked ink flow
Solution Approach 1:
The patent implements local quality by strategically placing high row banks in regions where defect containment is the priority, while using low row banks in regions where ink equalization is more critical. This allows each local region to optimize for its primary function while the overall system balances both requirements.
Solution Approach 2:
The segmentation of row banks into high and low types enables the system to create localized containment zones with high row banks where defective element spread needs to be limited, while maintaining ink flow continuity in other regions through low row banks.
3Ease of manufacture
If uniform row bank height is used throughout the display panel, then manufacturing process is simplified, but it is impossible to simultaneously optimize both ink equalization and defective element containment across different regions
Solution Approach 1:
The patent applies local quality by assigning different row bank heights to different regions based on their specific functional requirements. This allows the manufacturing process to optimize for both ink equalization and defect containment in their respective regions, achieving superior overall performance despite increased manufacturing complexity.
Data Source
AI summary
A display panel 1 includes a substrate 12, a first column bank 30A, a second column bank 30B, a third column bank 30C, first row banks 40A in a first column region 35A, second row banks 40B in a second column region 35B, blue organic light-emitting elements 11B, and green organic light-emitting elements 11G. The number of high row banks between blue organic light-emitting elements is less than the number of high row banks between green organic light-emitting elements.