Organic EL Display Partition Walls Suppressing Luminance Unevenness
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Solution Overview
Problem
In organic EL display panels using line banks, ink flow between partition walls can lead to luminance unevenness due to ink concentration at foreign matter and dried ink masses, causing film thickness inconsistencies and luminance issues.
Innovation Solution
The formation of a substrate with first and second partition walls, where the second partition walls have a lower upper surface than the first, and a coat with higher lyophilicity than the second partition walls is applied to prevent ink discontinuity and ensure even ink distribution across pixel regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If line banks are used to form partition walls, then ink flow in the column direction can uniformize film thickness, but ink concentrates at foreign matter and dried ink masses causing film thickness unevenness
Solution Approach 1:
The partition wall structure is segmented into two directions: first partition walls extend in the column direction to enable ink flow for uniformity, while second partition walls extend in the row direction to restrict excessive ink flow and prevent concentration at defect points
Solution Approach 2:
The second partition walls are positioned specifically at intervals in the row direction to locally control ink flow behavior, creating different flow characteristics in different regions of the pixel region
2Manufacturing precision
If second partition walls are added to suppress ink flow, then film thickness unevenness is reduced, but ink may become discontinuous on the partition walls causing luminance unevenness
Solution Approach 1:
The coat is formed on the second partition walls before ink application to preliminarily prepare the surface with high lyophilicity, ensuring that the ink will continuously wet the partition wall surface during the drying process
Solution Approach 2:
The surface property of the second partition walls is changed by forming a coat with higher lyophilicity, altering the interaction between the ink and partition wall surface to prevent discontinuity
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 configuration effectively suppresses luminance unevenness by maintaining ink continuity and ensuring consistent film thickness across the display panel, enhancing display quality.
Implementation Method 1
a coat having higher lyophilicity than the second partition walls is formed at least on the upper surfaces of the second partition walls
Data Source
AI summary
An organic EL display panel includes plural streaks of first partition walls 16 on the upper side of an underlying layer 13 in such a manner that each of the plural streaks of the first partition walls 16 extends along a first direction, plural streaks of second partition walls 14 that are on the upper side of the underlying layer 13 in such a manner that each of the plural streaks of the second partition walls 14 extends along a second direction intersecting the first direction, and each have an upper surface 14a at a position lower than upper surfaces 16a of the first partition walls 16, and a light emitting layer 17 formed along the first direction on the upper side of the underlying layer 13 and in gaps 20 between the first partition walls 16 adjacent to each other in such a manner as to get over the plural streaks of the second partition walls 14. An organic EL display panel in which luminance unevenness is suppressed is thereby obtained.