OLED Process Conversion Layer for Current Leakage and Cross Color
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Solution Overview
Problem
Serial OLED devices face issues of current leakage and cross color due to increased height of spacer layers between sub-pixels, leading to poor luminance efficiency and color shift, especially in high pixel density displays.
Innovation Solution
Incorporating a process conversion layer with high resistivity insulating oxide material between electrodes to fill uneven regions and prevent short circuits, while maintaining high luminance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the height of spacer layer between sub-pixels is increased to prevent current leakage, then current leakage is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a pixel defining layer as an intermediary structure between adjacent sub-pixels. This layer serves as a mediator that physically separates the sub-pixels and prevents lateral current leakage, while maintaining a manageable structural complexity through its specific material composition and geometric design
Solution Approach 2:
The patent optimizes the height parameter of the pixel defining layer to achieve effective current leakage prevention. By carefully controlling the height within a specific range, the patent prevents current leakage while avoiding excessive structural complexity that would arise from overly tall spacer layers
2Reliability
If the height of spacer layer is increased to prevent cross color, then cross color is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The pixel defining layer is constructed using composite materials with specific electrical properties. The layer incorporates insulating materials that provide effective electrical isolation between sub-pixels, preventing cross-color contamination while maintaining manufacturability through standard fabrication processes
Solution Approach 2:
The patent applies different material properties to different regions of the pixel defining layer. The layer exhibits high electrical insulation properties at critical interfaces where current leakage occurs, while maintaining appropriate mechanical properties throughout the structure for manufacturability
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
The process conversion layer effectively stabilizes current flow and prevents cross color and current leakage, ensuring high luminance and efficiency in OLEDs and display panels with high pixel density.
Implementation Method 1
the process conversion layer is formed by atomic layer deposition (ALD) or sputtering deposition
Data Source
AI summary
An organic light-emitting diode (OLED) includes: a first electrode, a first light-emitting layer disposed on a side of the first electrode, a charge generation layer disposed on a side, away from the first electrode, of the first light-emitting layer, a second light-emitting layer disposed on a side, away from the first light-emitting layer, of the charge generation layer, and a second electrode disposed on a side, away from the charge generation layer, of the second light-emitting layer. The OLED further includes: a process conversion layer, disposed between the first electrode and the second electrode, and configured to fill an uneven region between the first electrode and the second electrode.