Flexible Transparent Conductive Layer for OLED Cathode Reliability
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) display apparatuses face issues with the brittleness of transparent conductive materials used in cathodes, leading to poor electrical connections due to susceptibility to physical damage during assembly, especially in large-size display panels.
Innovation Solution
An organic light emitting diode display substrate with a flexible transparent conductive layer on spacers, electrically connected to an auxiliary cathode, which is made of a non-transparent metallic material, ensuring low resistance without affecting light transmission and providing a durable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive materials are used in cathodes, then light transmission is maintained, but electrical connection reliability deteriorates due to brittleness and susceptibility to physical damage
Solution Approach 1:
The patent applies composite materials by combining transparent conductive materials with flexible transparent conductive layers (such as ITO with PEDOT:PSS or other flexible transparent conductors). This composite structure maintains the light transmission properties of transparent materials while adding flexibility and mechanical durability to prevent breakage during assembly, directly resolving the contradiction between light transmission and electrical connection reliability
Solution Approach 2:
The patent implements flexible transparent conductive layers as thin films that can bend and deform without breaking. These flexible layers are deposited over the cathode structure, providing mechanical protection and flexibility while maintaining electrical conductivity and transparency. This allows the cathode to withstand assembly processes without damage, solving the reliability issue while preserving light transmission
2Reliability
If auxiliary cathode with flexible transparent conductive layer is added, then electrical connection reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the auxiliary cathode function with the existing cathode structure by integrating flexible transparent conductive layers directly onto the cathode or spacer structures. This combination eliminates the need for separate auxiliary components while achieving improved electrical connection reliability, thus reducing device complexity compared to adding entirely separate auxiliary systems
Solution Approach 2:
The flexible transparent conductive layer serves multiple functions simultaneously: it provides electrical conductivity for the cathode, maintains light transmission for display functionality, and offers mechanical flexibility and protection. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while improving reliability
Data Source
AI summary
The present application discloses an organic light emitting diode display substrate. The organic light emitting diode display substrate includes a base substrate; an auxiliary cathode on the base substrate; a spacer layer on the base substrate and including a plurality of spacers; and a flexible transparent conductive layer on a side of each of the plurality of spacers distal to the base substrate. The flexible transparent conductive layer is electrically connected to the auxiliary cathode.