OLED Pixel Defining Layer with Auxiliary Electrode Pattern
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Top-emitting-type OLED display devices face issues with light emitting non-uniformity due to severe voltage drops in the cathode layer, which can be mitigated by incorporating an auxiliary electrode pattern and conductive material layer, but manufacturing challenges arise from the material of the light emitting layer contacting the auxiliary electrode pattern during the formation process.
Innovation Solution
A pixel defining layer is designed with an auxiliary electrode pattern and sub-defining layers, featuring openings that allow the light emitting layer to be formed without contact with the auxiliary electrode pattern, ensuring uniform voltage distribution and improved electrical connection by using a conductive material layer connected to the auxiliary electrode pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary electrode pattern is added to reduce voltage drop, then light emitting uniformity is improved, but the risk of light emitting layer material contacting the auxiliary electrode pattern increases
Solution Approach 1:
A pixel defining layer is introduced as an intermediary structure between the auxiliary electrode pattern and the light emitting layer. This layer includes a first sub-defining layer and a second sub-defining layer that physically separate the light emitting layer material from the auxiliary electrode pattern, preventing unwanted contact while allowing the auxiliary electrode to maintain its voltage distribution function.
Solution Approach 2:
The pixel defining layer is divided into multiple sub-defining layers (first sub-defining layer and second sub-defining layer) with different functions. The first sub-defining layer provides initial definition and spacing, while the second sub-defining layer provides final protection and precise positioning, creating a segmented defense system against material contact.
2Reliability
If the auxiliary electrode pattern is placed closer to the light emitting layer to improve electrical connection, then voltage distribution is improved, but the likelihood of material contact with the auxiliary electrode increases
Solution Approach 1:
The pixel defining layer acts as a mediator that enables close positioning of the auxiliary electrode pattern to the light emitting layer for improved electrical connection, while simultaneously preventing material contact through its physical barrier function. The layer allows optimal electrical coupling without compromising manufacturing precision.
3Manufacturing precision
If a pixel defining layer with openings is introduced to prevent material contact, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The pixel defining layer is segmented into two functional sub-layers with distinct roles. The first sub-defining layer provides initial structural support and spacing, while the second sub-defining layer provides precise opening definition and protection. This segmentation allows each layer to be optimized independently, managing complexity through functional decomposition.
Solution Approach 2:
The pixel defining layer performs multiple functions simultaneously: it defines pixel boundaries, prevents material contact with the auxiliary electrode, provides mechanical support, and guides material deposition. By consolidating these functions into a single multi-functional layer rather than separate components, the design reduces overall device complexity while maintaining manufacturing precision.
Data Source
AI summary
Disclosed are a pixel defining layer and a manufacturing method thereof, and a display panel, in the field of display technologies. An auxiliary electrode pattern is on a side of a substrate and configured to be electrically connected to a cathode in a display panel; and a first sub-defining layer is on a side of the auxiliary electrode pattern away from the substrate. A pixel defining layer has a plurality of openings, and the plurality of openings all pass through the auxiliary electrode pattern and the first sub-defining layer. The opening is configured to accommodate a material of a light emitting layer. An orthographic projection of the auxiliary electrode pattern on the substrate is within an orthographic projection of the first sub-defining layer on the substrate.