OLED Display Substrate Auxiliary Electrode IR Drop Reduction
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Solution Overview
Problem
The brightness of organic light emitting diode (OLED) display panels becomes uneven due to IR drop in the plate electrode, particularly as the display size increases, affecting light emission and transmittance in transparent regions.
Innovation Solution
A display substrate with a light emitting region and a transparent display region, featuring a metal auxiliary electrode on the light exiting side and a transparent conductive auxiliary connection member that extends into both regions, forming a parallel structure with the second electrode layer to reduce IR drop and maintain light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plate electrode is used to electrically couple cathodes of multiple organic light emitting diodes, then electrical connection is achieved, but IR drop causes uneven brightness in large display panels
Solution Approach 1:
The patent divides the single plate electrode into multiple separate electrode structures. Each pixel unit has its own second electrode, and auxiliary electrodes are distributed across the display region. This segmentation reduces the current path length and resistance, minimizing IR drop and improving brightness uniformity across large display panels.
Solution Approach 2:
The patent implements local quality by placing auxiliary electrodes specifically in regions where IR drop is most problematic. The auxiliary connection members are strategically positioned to provide localized current paths, ensuring that areas with higher resistance receive additional electrical support to maintain uniform brightness.
2Illumination intensity
If transparent regions occupy 40% of the display surface, then transparency is improved, but electrical connection and brightness uniformity become more difficult to maintain
Solution Approach 1:
The patent introduces auxiliary connection members as intermediary structures that bridge the transparent display region and the light emitting region. These connection members provide electrical pathways through the transparent region without compromising its optical properties, enabling reliable electrical connection while maintaining 40% transparency.
Solution Approach 2:
The patent uses composite material structures combining transparent conductive materials with metal auxiliary electrodes. This composite approach allows the creation of electrical connection structures that are both conductive and transparent, solving the contradiction between electrical reliability and optical transparency in the display panel.
3Illumination intensity
If auxiliary electrodes are added to reduce IR drop, then brightness uniformity improves, but device complexity increases
Solution Approach 1:
The patent merges the auxiliary electrodes with existing pixel electrode structures and integrates auxiliary connection members into the overall electrode system. By combining these functions into a unified electrode architecture, the patent reduces manufacturing steps and simplifies the overall device structure while still achieving brightness uniformity.
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 solution ensures uniform brightness and improved display performance by minimizing IR drop and maintaining light transmittance through the transparent regions, enhancing the overall display effect.
Implementation Method 1
an auxiliary connection member made of a transparent conductive material... the auxiliary electrode is electrically coupled with the portion of the auxiliary connection member in the light emitting region, and the second electrode layer is electrically coupled with the other portion of the auxiliary connection member in the transparent display region
Implementation Method 2
the area of the transparent region can reach 40% of the total area of the display surface of the display panel... the IR drop of the plate electrode during display may cause the brightness of the display panel to be uneven
Data Source
AI summary
The present application provides a display substrate, a method of manufacturing the same and a display panel. The display substrate includes pixel units each including a light emitting region and a transparent display region. A light emitting element including a first electrode, a light emitting functional layer and a second electrode is provided in the light emitting region, and second electrodes of light emitting elements forms a second electrode layer having an integral structure. The display substrate further includes an auxiliary electrode in the light emitting region and an auxiliary connection member made of a transparent conductive material. A portion of the auxiliary connection member is in the light emitting region and electrically coupled with the auxiliary electrode and another portion thereof is in the transparent display region and electrically coupled with the second electrode layer.