OLED Cathode Conducting Wire for Uniform Voltage Distribution
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Solution Overview
Problem
The existing OLED display substrates suffer from non-uniform light emission and poor display quality due to the high resistance of the cathode layer, leading to uneven voltage drops across pixel regions.
Innovation Solution
An OLED display substrate design that includes a base substrate with a pixel defining layer, a first electrode (anode), a second electrode (cathode), and an organic light-emitting functional layer, where a conducting wire connects adjacent cathode electrodes on the pixel defining layer, reducing the overall resistance and ensuring uniform voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cathode layer structure is used in OLED display substrates, then the manufacturing process is simple, but the resistance is high causing non-uniform light emission and poor display quality
Solution Approach 1:
The cathode layer is segmented into multiple independent cathode electrodes, each corresponding to a pixel region. This segmentation allows for better control of electrical properties in different regions, reducing overall resistance and improving light emission uniformity while maintaining manufacturing simplicity through standardized pixel structures.
Solution Approach 2:
A conducting wire is introduced as an intermediary component to connect adjacent cathode electrodes. This conducting wire serves as a mediator that reduces electrical resistance between pixel regions, ensuring uniform voltage distribution and improving display quality without significantly complicating the manufacturing process.
2Reliability
If the cathode layer resistance is reduced by increasing conductor material, then the voltage distribution becomes uniform, but the manufacturing cost and process complexity increase
Solution Approach 1:
Different regions of the cathode structure are assigned different functions and materials. The cathode electrodes in pixel regions use materials optimized for light emission, while the conducting wires connecting them use materials optimized for low resistance. This local differentiation achieves uniform voltage distribution without uniformly increasing manufacturing complexity across the entire structure.
Solution Approach 2:
The cathode structure employs composite materials: the cathode electrodes use materials suitable for organic light-emitting diode operation, while the conducting wires use highly conductive materials. This composite approach optimizes both electrical performance and manufacturing feasibility by selecting appropriate materials for each functional requirement.
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 implementation of the cathode conducting wire reduces the resistance of the cathode layer, resulting in uniform light emission and improved display quality across the OLED display substrate.
Implementation Method 1
a conducting wire on the pixel defining layer and configured to connect the second electrodes located in the at least two adjacent pixel regions
Implementation Method 2
an organic light-emitting functional layer between the first electrode and the second electrode
Data Source
AI summary
An organic light-emitting diode display substrate, a method of manufacturing the same, and a display apparatus are provided. The organic light-emitting diode display substrate includes: a base substrate; a pixel defining layer on the base substrate and defining a plurality of pixel regions, wherein a first electrode, a second electrode and an organic light-emitting functional layer between the first electrode and the second electrode are disposed in each of at least two adjacent ones of the plurality of pixel regions; and a conducting wire on the pixel defining layer and configured to connect the second electrodes located in the at least two adjacent pixel regions.