OLED Planarization Groove Layout for Water Diffusion Control
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Solution Overview
Problem
In OLED display panels, water molecules in the planarization layer escape and erode the light-emitting functional layer, shortening the service life of the display product due to the inability to completely remove water through conventional heating methods.
Innovation Solution
The display panel design includes a substrate with pixel units arranged in an array, each subpixel featuring a subpixel driving circuitry, a planarization layer with a groove formed on its surface, and an anode pattern. The groove's projection on the substrate surrounds the anode's middle portion, with the peripheral portion's projection located within the groove's projection, effectively narrowing the diffusion channel for water molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heating method is used to remove water molecules from the planarization layer, then the manufacturing process is simple, but the water molecules cannot be completely removed and escape to erode the light-emitting functional layer
Solution Approach 1:
The planarization layer is segmented by introducing grooves that divide the continuous layer into separated regions. These grooves create physical barriers that segment the water molecule diffusion paths, preventing water from reaching the light-emitting functional layer while maintaining the overall integrity of the planarization layer.
Solution Approach 2:
The grooves act as intermediary structures between the planarization layer and the light-emitting functional layer. They serve as buffer zones that intercept and contain water molecules, preventing direct contact between water and the light-emitting functional layer, thus protecting the latter without requiring complete water removal.
2Reliability
If the planarization layer is made thick to ensure coverage, then the coverage is sufficient, but water molecules have longer diffusion paths and can escape more easily
Solution Approach 1:
By segmenting the planarization layer with grooves, the diffusion paths of water molecules are divided into multiple shorter segments rather than allowing long continuous paths. This segmentation effectively reduces the maximum diffusion distance water molecules can travel before encountering a groove barrier.
Solution Approach 2:
The grooves create local regions with different properties - the groove areas have reduced water content and act as water-trapping zones, while the raised portions maintain sufficient thickness for coverage. This local variation in quality optimizes both protection and water containment.
3Reliability
If grooves are formed in the planarization layer to narrow water diffusion channels, then water erosion is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The groove dimensions (depth, width, spacing) are optimized to achieve effective water containment while maintaining compatibility with existing manufacturing capabilities. By carefully selecting parameters within feasible ranges, the solution balances manufacturing ease with improved reliability.
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
This design slows down the release of water molecules from the planarization layer, reducing their erosion impact on the light-emitting functional layer and thereby prolonging the service life of the OLED display panel.
Implementation Method 1
narrowing the diffusion channel for water molecules
Implementation Method 2
conventional heating method
Data Source
AI summary
A display panel includes a substrate, and a plurality of pixel units arranged on the substrate in an array form and each including a plurality of subpixels. Each subpixel includes a subpixel driving circuitry, a planarization layer and an anode pattern laminated one on another, each anode pattern of at least a part of the subpixels includes a middle portion and a peripheral portion surrounding the middle portion, a groove is formed in a surface of the planarization layer away from the substrate, an orthogonal projection of the groove onto the substrate surrounds an orthogonal projection of the middle portion onto the substrate, and at least a part of an orthogonal projection of the peripheral portion onto the substrate is located within the orthogonal projection of the groove onto the substrate.