Auxiliary Electrode Segmentation for OLED Voltage Drop Reduction
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Solution Overview
Problem
Organic light-emitting display devices face increased wiring resistance issues with common electrodes covering all pixels, which leads to voltage drops and reduced image quality.
Innovation Solution
The implementation of an auxiliary electrode with low resistance materials like aluminum or silver, positioned non-overlappingly with light emission regions, and an auxiliary layer with weaker adhesion, to reduce surface resistance and prevent voltage drops without compromising the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common electrode covers all pixels to provide uniform voltage, then the device structure is simplified, but the wiring resistance increases causing voltage drops
Solution Approach 1:
The common electrode is divided into a main common electrode and multiple auxiliary electrodes arranged in stripes. This segmentation reduces the wiring resistance by distributing the voltage supply across multiple smaller electrode segments, preventing voltage drops while maintaining the simplified structure benefit.
2Reliability
If the auxiliary electrode is positioned to reduce resistance, then voltage stability improves, but the aperture ratio may be compromised
Solution Approach 1:
The auxiliary electrodes are strategically positioned in non-light-emitting regions or arranged in stripes that optimize both electrical performance and optical performance. This local quality approach ensures that electrode placement reduces resistance without significantly blocking light emission areas, maintaining high aperture ratio.
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 configuration effectively reduces voltage drops by approximately 25% and enhances the image quality of organic light-emitting display devices by minimizing surface resistance and maintaining the aperture ratio.
Implementation Method 1
an auxiliary electrode, which is formed on the auxiliary electrode, does not overlap the light emission regions, and extends in the second direction
Implementation Method 2
organic light-emitting display devices are self-emission type display devices that emit light by electrically exciting an organic compound
Data Source
AI summary
A display device including a substrate; an organic light emission unit, which is arranged on the substrate, wherein light emission regions arranged in a first direction emit light of a same color and light emission regions adjacent to one another from among light emission regions arranged in a second direction crossing the first direction emit light of different colors; a counter electrode, which is arranged to cover at least the light emission regions; and an auxiliary electrode, which is formed on the auxiliary electrode, does not overlap the light emission regions, and extends in the second direction.