OLED Display Panel Electrode Connection Stability
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Solution Overview
Problem
The stability and yield of OLED display panels are compromised due to the susceptibility of the first electrode to breakage when connected to the first electrode contact portion, primarily because of the large inclination angle and thickness differences between the electrodes and the light emitting layer.
Innovation Solution
The display panel design includes a light emitting layer that extends partially to the inner edge or surface of the first electrode contact portion, reducing the inclination angle and ensuring a stable connection between the first electrode and the first electrode contact portion, thereby improving the panel's stability and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first electrode is connected to the first electrode contact portion with a large inclination angle and thickness difference, then the connection area is reduced, but the electrode becomes more susceptible to breakage
Solution Approach 1:
The light emitting layer extends in the vertical dimension (Z-direction) to cover the first electrode contact portion, creating a stepped structure. This dimensional extension allows the first electrode to overlap with the contact portion through the light emitting layer, increasing the connection area and reducing stress concentration that would cause breakage.
Solution Approach 2:
The first electrode is positioned within the projection area of the light emitting layer, which itself extends over the first electrode contact portion. This nested arrangement creates a multi-layer overlapping structure where the electrode is protected and supported by the light emitting layer during connection to the contact portion.
2Reliability
If the light emitting layer extends to the first electrode contact portion, then the connection stability is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The light emitting layer is formed to extend over the first electrode contact portion before the first electrode is deposited. This preliminary extension creates a built-in alignment reference and support structure, making the subsequent electrode formation less sensitive to positioning errors and reducing the overall manufacturing precision requirements.
Solution Approach 2:
The extended light emitting layer acts as an intermediary structure between the first electrode and the first electrode contact portion. It provides a transition zone that facilitates alignment and connection, reducing the direct precision requirements between the electrode and contact portion by introducing this intermediate supporting layer.
Data Source
AI summary
A display panel includes a base substrate, a first electrode contact portion, a light emitting layer, and a first electrode. The first electrode contact portion is disposed on the base substrate and surrounding a display area, and is separated from the display area by an isolation area. The light emitting layer covers the display area and at least a portion of the isolation area, and extends at least partially to an inner edge of the first electrode contact portion or a surface of the first electrode contact portion away from the base substrate. The first electrode is disposed on the light emitting layer and a portion of the first electrode contact portion that is not covered by the light emitting layer.