OLED Backplane Initializing Voltage Line Resistance Reduction
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Solution Overview
Problem
Existing organic light emitting display (OLED) devices suffer from horizontal stripe mura due to voltage fluctuations in initializing voltage input lines, which are influenced by the resistance of anode wiring, leading to uneven light emission and display defects.
Innovation Solution
The backplane design includes an initializing voltage input line formed in the same layer and made of the same material as the thin film transistor electrodes, reducing resistance and stabilizing voltage signals, thereby alleviating horizontal stripe mura without significant changes to the existing fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the initializing voltage input line is made of anode wiring material, then the fabrication process is simplified, but voltage fluctuations occur due to high resistance causing horizontal stripe mura
Solution Approach 1:
The patent changes the material parameter of the initializing voltage input line from anode wiring material (high resistance) to electrode material (low resistance). This parameter change reduces the resistance of the input line, thereby stabilizing the voltage signal and eliminating horizontal stripe mura while maintaining fabrication simplicity through integration with the electrode formation process
Solution Approach 2:
The patent employs composite material structure by using electrode material (such as Ti/Al/Ti) for the initializing voltage input line, which combines the benefits of low resistance and compatibility with existing fabrication processes. This composite approach allows the input line to function effectively while being formed in the same layer as the electrode structures
2Reliability
If the initializing voltage input line is formed in a separate layer, then voltage stability can be improved, but device complexity and fabrication steps increase
Solution Approach 1:
The patent merges the initializing voltage input line with the electrode layer structure, forming both components in the same layer using the same material. This integration reduces device complexity by eliminating separate input line layers while maintaining voltage signal stability through the low-resistance electrode material
Solution Approach 2:
The electrode material layer serves multiple functions: it forms the transistor electrodes (source, drain, gate) and simultaneously forms the initializing voltage input line. This multi-functionality reduces structural complexity while ensuring voltage stability through the inherent low resistance of the electrode material
Data Source
AI summary
The present disclosure discloses a backplane for an organic light emitting display device, a method for fabricating the same, and an organic light emitting display apparatus. The backplane includes a substrate on which a wiring structure and a thin film transistor are provided, wherein the wiring structure includes an initializing voltage input line which is provided in the same layer and made of the same material as electrodes of the thin film transistor.