Asymmetric Partition Wall for OLED Ink Running Prevention
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Solution Overview
Problem
In organic electroluminescence display panels, ink running during the formation of the organic light-emitting layer leads to irregular color emission, brightness issues, and reduced useful light-emitting life due to the sinking of the partition wall top face, which degrades the panel's quality, especially in high-definition displays where pixel spacing is narrow.
Innovation Solution
The configuration of the organic electroluminescence display panel includes a substrate with a first and second lower electrode separated by a partition wall, where at least a part of the bottom face of the first portion of the partition wall is positioned higher than the bottom face of the second portion, constraining the sinking of the partition wall top face and preventing ink running, thereby ensuring stable quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the partition wall is formed with a conventional structure where the bottom face is at the same level, then the manufacturing process is simple, but the top face sinks during formation causing ink running
Solution Approach 1:
The partition wall is designed with an asymmetric structure where the first portion (over the gap) has its bottom face positioned higher than the bottom face of the second portions (over the lower electrodes). This asymmetric configuration prevents the top face from sinking uniformly, creating a structure that effectively blocks ink running while maintaining manufacturing feasibility through conventional photolithography and curing processes.
Solution Approach 2:
The solution introduces a vertical height difference in the partition wall structure by positioning the bottom face of the first portion at a different elevation than the bottom face of the second portions. This dimensional change in the vertical axis creates an effective barrier against ink running without complicating the horizontal layout or manufacturing process.
2Measurement precision
If the pixel spacing is reduced for high-definition displays, then the display resolution is improved, but ink running becomes more common degrading quality
Solution Approach 1:
The asymmetric partition wall structure with the elevated first portion creates a more effective barrier in narrow spaces. The height difference in the bottom faces prevents ink from bridging the gap between closely spaced pixels, maintaining reliable ink containment even when pixel spacing is reduced for high-definition displays.
3Reliability
If the partition wall uses a resin material with photolithography patterning, then the adhesion and solvent resistance are improved, but the top face still sinks causing ink running
Solution Approach 1:
By configuring the partition wall with an asymmetric bottom face elevation where the first portion is higher, the invention prevents the top face sinking that causes ink running. This structural asymmetry works in conjunction with the resin material's adhesion and solvent resistance properties to achieve reliable ink containment.
Data Source
AI summary
An organic EL display panel including: a substrate; a first lower electrode and a second lower electrode disposed over the substrate with a gap therebetween in a first direction; a wall separating a space above the first lower electrode and a space above the second lower electrode from one another; organic light-emitting layers respectively disposed in the spaces; and an upper electrode extending over the organic light-emitting layers. The wall includes a first portion disposed over the gap and two second portions each of which is disposed over a different one of the first lower electrode and the second lower electrode. The first portion is between the two second portions in the first direction, and at least a part of a bottom face of the first portion is positioned higher than a bottom face of the second portion.