OLED Display Panel Auxiliary Electrode Contact Hole Design
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Solution Overview
Problem
Existing display panels face challenges in stabilizing current supply to light-emitting elements, affecting the operating characteristics and efficiency of OLED display devices.
Innovation Solution
A display panel design that includes a substrate with an emission area and non-emission area, featuring a driving element, auxiliary electrode, protective layer, first and second organic material layers, and a contact hole to ensure stable electrical connection between the auxiliary electrode and the second electrode, allowing for stable power supply to the light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional OLED structure is used, then the display device has thin thickness and light weight, but the current supply to the light-emitting element is unstable
Solution Approach 1:
An auxiliary electrode is introduced as an intermediary component between the driving element and the second electrode. This auxiliary electrode serves as a mediator to provide a stable electrical connection and ensure reliable current supply to the light-emitting element, resolving the instability issue without fundamentally changing the OLED structure
Solution Approach 2:
The electrical connection path is segmented into multiple components: the driving element, the auxiliary electrode, and the second electrode. By dividing the connection into separate functional elements with a contact hole interface, the system achieves more stable current supply while maintaining structural clarity
2Reliability
If the auxiliary electrode is placed close to the driving element, then the electrical connection is shorter, but the electrical interference and instability increase
Solution Approach 1:
The auxiliary electrode acts as a spatially separated intermediary that provides electrical connection without requiring proximity to the driving element. This mediator approach allows sufficient spacing while maintaining stable electrical connection through the contact hole structure
3Reliability
If the second organic material layer is formed continuously over the contact hole, then the layer coverage is complete, but the electrical connection between the second electrode and auxiliary electrode is disrupted
Solution Approach 1:
The second organic material layer is extracted or removed from the contact hole region to preserve the electrical connection path. This selective omission allows the layer to be formed continuously elsewhere while maintaining the critical electrical interface between the second electrode and auxiliary electrode
Solution Approach 2:
Instead of forming the second organic material layer completely and uniformly across all surfaces, the process applies partial coverage that intentionally excludes the contact hole area. This partial action approach prioritizes electrical connection reliability over complete layer coverage
Data Source
AI summary
A display panel includes a substrate including an emission area and a non-emission area; a driving element for driving the display panel; an auxiliary electrode placed in the non-emission area, and spaced apart from the driving element; a protective layer placed on the driving element and the auxiliary electrode; a first electrode placed on the protective layer, and connected to the driving element; a first organic material layer placed on the first electrode; a second electrode placed above the first organic material layer and the protective layer; a second organic material layer placed between the second electrode and the first organic material layer; and a contact hole penetrating through the protective layer, and exposing the auxiliary electrode, wherein the second electrode is electrically connected to the auxiliary electrode within the contact hole.