OLED Cathode Strapping Structure for Large-Panel Voltage Drop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-size OLED display panels face challenges with voltage drop and display uniformity due to their size and thinner cathodes, particularly in top-emission panels, which are complicated to manufacture and reduce production efficiency.
Innovation Solution
A display panel design featuring a multi-layer stacking conductive auxiliary electrode with a strapping hole allows the cathode layer to extend into the hole and contact a conductive structure close to the substrate, eliminating the need for isolation columns and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inverted trapezoidal isolation column is disposed between the cathode and the auxiliary electrode to improve voltage drop phenomenon, then the voltage drop is improved, but the manufacturing complexity increases and production efficiency decreases
Solution Approach 1:
The patent removes the isolation column structure from the design. Instead of adding an inverted trapezoidal isolation column between the cathode and auxiliary electrode, the patent uses a planar cathode structure that directly contacts the auxiliary electrode through a hole in the common layer, eliminating the complex isolation column manufacturing steps while maintaining voltage distribution improvement
Solution Approach 2:
The patent segments the cathode into multiple regions (first cathode region and second cathode region) with different configurations. The second cathode region extends into the hole to contact the auxiliary electrode, while the first cathode region remains planar. This segmentation allows different functional zones without requiring complex isolation structures
2Reliability
If an inverted trapezoidal isolation column is used to improve voltage drop, then display uniformity is improved, but the aperture ratio is reduced due to large volume of isolation column
Solution Approach 1:
By removing the isolation column entirely, the patent eliminates the large volume structure that reduced aperture ratio. The planar cathode configuration with direct contact through the hole achieves display uniformity without occupying additional space that would reduce the aperture ratio
3Reliability
If an inverted trapezoidal isolation column is disposed to improve voltage drop, then the cathode and auxiliary electrode are properly isolated, but the molding difficulty increases
Solution Approach 1:
The patent eliminates the isolation column that caused molding difficulties. The isolation function is achieved differently by using the hole structure in the common layer and the extended cathode region, which are easier to manufacture using standard thin-film deposition and patterning processes
Solution Approach 2:
Instead of using a three-dimensional inverted trapezoidal isolation column, the patent transitions to a planar configuration where the cathode extends into a hole to contact the auxiliary electrode. This dimensional change from 3D isolation structure to 2D planar contact simplifies the molding process while maintaining proper isolation and electrical connection
4Reliability
If an inverted trapezoidal isolation column is used to improve voltage drop, then the electrical connection is improved, but the selectivity of raw material decreases
Solution Approach 1:
By removing the isolation column, the patent eliminates the constraint on raw material selection that the complex isolation structure imposed. The simplified planar cathode configuration can be manufactured with a broader range of materials using conventional deposition techniques
Data Source
AI summary
A display panel and a method of manufacturing the display panel are provided in the present application. An auxiliary cathode is disposed in the driving circuit layer of the display panel, at the same time, a strapping hole is disposed on the auxiliary cathode. The cathode layer can extend into the strapping hole and contact with a conductive structure. Therefore, a voltage drop can be improved.