OLED Auxiliary Electrode Voltage Drop Reduction
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Solution Overview
Problem
The existing OLED display units face issues with damaging and aging effects on the light emitting material layer due to the production of the auxiliary electrode, leading to reduced luminous efficiency and lifetime, and increased power consumption from voltage drops across the cathode electrodes in large-sized displays.
Innovation Solution
The auxiliary electrode is formed prior to the light emitting material layer and connected with the second electrode to reduce impedance, eliminating the need for a protective layer and simplifying the production process, while being integrated into the same layer as thin film transistor components to minimize voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the auxiliary electrode is formed after the light emitting material layer, then the voltage drop of the cathode can be reduced, but the light emitting material layer is damaged and aged during production
Solution Approach 1:
The auxiliary electrode is formed before the light emitting material layer is deposited, rather than after. This preliminary action allows the auxiliary electrode to be in place to reduce cathode voltage drop before the light emitting material layer is created, eliminating the need for protective layers and avoiding damage to the light emitting material layer during auxiliary electrode production.
2Loss of energy
If the auxiliary electrode is formed after the light emitting material layer, then the voltage drop is reduced, but additional protective layers and processes are required
Solution Approach 1:
The auxiliary electrode is formed in advance before the light emitting material layer, eliminating the need for subsequent protective layers and simplifying the manufacturing process while still achieving voltage drop reduction.
Solution Approach 2:
The need for protective layers is extracted and eliminated by changing the sequence of operations - forming the auxiliary electrode before the light emitting material layer removes the requirement for protecting the cathode during auxiliary electrode production.
3Loss of energy
If the auxiliary electrode is formed after the light emitting material layer, then the voltage drop is reduced, but the production time increases
Solution Approach 1:
The auxiliary electrode is formed as a preliminary step before depositing the light emitting material layer, allowing both processes to proceed without interruption and eliminating the need for additional protective layer formation, thus reducing total production time.
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
This approach prevents damage to the light emitting material layer, reduces power consumption, and enhances the overall performance of OLED display units by minimizing voltage drops and simplifying the manufacturing process.
Implementation Method 1
a light emitting material layer, provided on the first electrode, emitting light under an applied electric field to form an image display
Implementation Method 2
an auxiliary electrode, provided below the second electrode, formed prior to the light emitting material layer, and connected with the second electrode to reduce impedance of the second electrode
Data Source
AI summary
Disclosed are an OLED display unit and a method for manufacturing the same. The OLED display unit includes a first electrode, a light emitting material layer, a second electrode, and an auxiliary electrode. The auxiliary electrode is provided below the second electrode, and is formed prior to the light emitting material layer. The auxiliary electrode is connected with the second electrode to reduce impedance of the second electrode. When the OLED display unit is used, a voltage drop resulted from a wire resistance of a cathode in a large sized display device can be reduced or eliminated, and increased power consumption caused by uneven light emission can be avoided.