Display Device Second Electrode Thickness Gradient Module Hole Durability
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Solution Overview
Problem
Display devices with integrated electronic modules, such as cameras, face durability issues due to particle generation and delamination of metal electrodes when holes are defined through the display area, especially under heat and moisture exposure.
Innovation Solution
A display device design featuring a base substrate with a circuit layer, a light emitting element layer, and a module hole area, where the second electrode has a thickness gradient and includes silver and magnesium with varying crystalline structures, and is formed using electrolysis to prevent delamination and particle generation during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hole is defined through the display area by a physical method, then the electronic module can be accommodated, but particles are generated from the metal electrode to damage the surrounding area and the electrode becomes delaminated and easily damaged by heat and moisture
Solution Approach 1:
The patent applies local quality by creating different structural characteristics in different regions of the second electrode. Specifically, the electrode has a first region with uniform thickness and a second region with gradually varying thickness, allowing each region to serve different functions - the uniform region provides stable electrical connection while the varying thickness region reduces stress concentration at the hole edges, preventing delamination and particle generation
Solution Approach 2:
The patent applies preliminary action by pre-forming the module hole through the encapsulation layer and substrate before completing the electrode formation process. This allows the electrode material to be deposited around the pre-existing hole, ensuring proper adhesion and reducing stress concentrations that would occur if the hole were created after electrode deposition
2Ease of manufacture
If the second electrode has uniform thickness, then the manufacturing process is simpler, but the electrode is more prone to delamination and damage under heat and moisture
Solution Approach 1:
The patent implements local quality by designing the second electrode with spatially varying thickness - a first region with uniform thickness for ease of manufacturing and a second region with gradually varying thickness near the module hole to reduce stress concentration and prevent delamination under thermal and moisture stress
3Adaptability or versatility
If the module hole passes through the circuit layer and light emitting element layer, then the camera module can be integrated, but the surrounding electrode material is subjected to stress that causes delamination
Solution Approach 1:
The patent applies local quality by creating a second region in the second electrode with gradually varying thickness around the module hole. This gradual thickness variation reduces stress concentration at the hole edges, maintaining electrode adhesion strength and preventing delamination while allowing the module hole to pass through for camera module integration
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 enhances the durability of display devices by preventing electrode delamination and particle generation, ensuring the device's integrity in hot and humid environments.
Implementation Method 1
forming an electrode hole overlapping the preliminary module hole area by electrolyzing the second electrode
Data Source
AI summary
A display device according to an embodiment may include a base substrate, a circuit layer, a light emitting element layer, and a module hole. The light emitting element layer may include a first electrode, a light emitting layer, and a second electrode. The second electrode may include a first portion that is not overlapped with the module hole and has a first thickness and a second portion between the module hole and the first portion and having a thickness that gradually increases in a direction toward the first portion. Thus, the display device may improve in durability in a hot and humid environment.