OLED Auxiliary Electrode Vertical Integration for Voltage Drop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the area of an active matrix organic light-emitting diode (AMOLED) display increases, the resistance of the cathode electrodes also increases, leading to non-uniform voltage application across pixels, which results in reduced image quality and luminance, and the introduction of an auxiliary electrode to mitigate this issue decreases the aperture ratio.
Innovation Solution
Incorporating an auxiliary electrode between insulating layers in the OLED display, with a protecting electrode to prevent damage and a stacked structure for the anode and protecting electrodes, allowing for electrical connection between the auxiliary and cathode electrodes, and using organic materials for the insulating layers to minimize voltage drop and maintain aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary electrode is introduced to reduce voltage drop and improve luminance uniformity, then image quality is improved, but the aperture ratio is reduced
Solution Approach 1:
The auxiliary electrode is repositioned from the conventional planar surface to an intermediate layer between insulating layers, utilizing the vertical dimension (z-axis) to resolve the conflict between aperture ratio and voltage distribution uniformity
Solution Approach 2:
The auxiliary electrode serves as an intermediary element positioned between the cathode electrode and the emission layer, mediating the electrical connection to reduce voltage drop without occupying excessive aperture space
2Productivity
If the area of AMOLED display increases to meet market demand, then productivity is improved, but resistance of cathode electrodes increases causing voltage drop
Solution Approach 1:
The electrical connection path is segmented into multiple components: cathode electrode, auxiliary electrode in intermediate layer, and insulating layers, allowing each segment to be optimized for its specific function in managing voltage distribution across large display areas
Solution Approach 2:
By introducing the auxiliary electrode in the vertical dimension between insulating layers, the solution addresses voltage drop in large-area displays without constraining horizontal expansion of the display area
Data Source
AI summary
An organic light-emitting diode (OLED) display and a method of manufacturing the OLED display are disclosed. In one aspect, the OLED display includes a substrate including a display region and a peripheral region, a first auxiliary electrode formed in the peripheral region, and a protecting electrode. The protecting electrode can be formed in the display region and the peripheral region, wherein at least a portion of the protecting electrode can be formed above the first auxiliary electrode.