Common Electrode Contact Structure to Prevent Display Voltage Drop
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Solution Overview
Problem
Existing display devices face challenges in achieving reliable performance due to issues such as voltage drop in the common electrode, which affects the overall display quality.
Innovation Solution
A display device is designed with a specific structure that includes a connection pattern and a dummy pattern on a substrate, a via layer with contact portions and via holes, a pixel electrode connected to the connection pattern, a light emitting layer, a control layer, and a common electrode. The dummy pattern is formed with a five-layered film structure, where the second and fourth conductive layers are made of aluminum and have a greater thickness than the other layers, with recessed side surfaces to enhance contact area with the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode is made with a simple single-layer structure, then the manufacturing process is simple, but voltage drop occurs affecting display quality
Solution Approach 1:
The common electrode is divided into multiple conductive layers (first conductive layer with aluminum, second conductive layer with titanium, third conductive layer with aluminum) stacked sequentially. Each layer serves specific functions: the aluminum layers provide high conductivity to prevent voltage drop, while the titanium layer enhances adhesion and prevents oxidation, collectively improving display quality through segmented functional design.
Solution Approach 2:
The common electrode uses a composite multi-layer structure combining different materials (aluminum and titanium) with complementary properties. The aluminum layers provide electrical conductivity while the titanium layer provides oxidation resistance and adhesion, creating a composite structure that prevents voltage drop and improves overall electrode performance.
2Reliability
If the contact area between common electrode and dummy pattern is increased, then voltage drop is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The dummy pattern is formed with protrusions that extend into the via holes before the common electrode layers are deposited. This preliminary structuring ensures that when the multi-layer common electrode is formed, the conductive layers automatically make contact with the protrusions, securing contact area and preventing voltage drop while maintaining feasible manufacturing precision through sequential deposition processes.
Solution Approach 2:
The common electrode layers are nested within and around the via holes, with the conductive layers wrapping around the protrusions of the dummy pattern. This nested configuration maximizes the contact area between the common electrode and the dummy pattern while accommodating the multi-layer structure within the via hole geometry, balancing contact stability with manufacturing feasibility.
Data Source
AI summary
A display device may include: a connection pattern and a dummy pattern disposed to be spaced apart from each other on a substrate; a via layer on the substrate; a pixel electrode on the via layer and electrically connected to the connection pattern; a light emitting layer disposed on the pixel electrode; a control layer disposed on the light emitting layer; and a common electrode disposed on the control layer. The dummy pattern may include a first conductive layer, a second conductive layer, a third conductive layer, a fourth conductive layer, and a fifth conductive layer sequentially disposed. The first conductive layer, the third conductive layer, and the fifth conductive layer may include the same material. The second conductive layer and the fourth conductive layer may include the same material. The first, third, fifth conductive layers and the second and fourth conductive layers may include different materials.