Common Electrode Connection Structure for Large Thin Displays
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Solution Overview
Problem
As display devices increase in size and decrease in thickness, the common electrode experiences voltage drops, necessitating a novel structure to prevent this issue.
Innovation Solution
A display device structure featuring a voltage line, a passivation layer with an undercut shape, first and second connecting electrodes, and a common electrode that is electrically connected to the voltage line through these electrodes, preventing direct contact with the voltage line and utilizing an undercut shape to cut off the emission layer for efficient electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the display device increases and the thickness decreases, then the display device achieves larger screen area and thinner profile, but voltage drop of the common voltage increases
Solution Approach 1:
The patent divides the connection path between the voltage line and common electrode into multiple segments: a first connecting electrode, a second connecting electrode, and a third connecting electrode. This segmentation allows the voltage to be transmitted through multiple shorter paths rather than one long path, reducing overall voltage drop in large-sized, thin display devices
Solution Approach 2:
The patent introduces a vertical dimension by forming connecting electrodes that extend in the thickness direction of the substrate. The undercut shape of the passivation layer creates vertical space for these electrodes, allowing voltage transmission through the thickness dimension rather than only along the surface, thereby reducing voltage drop in large-area devices
2Ease of manufacture
If the common electrode is directly connected to the voltage line, then the manufacturing process is simple, but the voltage drop cannot be effectively prevented
Solution Approach 1:
The patent introduces intermediate connecting electrodes (first, second, and third connecting electrodes) that mediate between the voltage line and the common electrode. These intermediaries provide multiple voltage transmission paths, effectively preventing voltage drop while maintaining manufacturing feasibility through standardized electrode formation processes
Solution Approach 2:
The patent employs a nested structure where the first connecting electrode is disposed inside the undercut shape of the passivation layer, the second connecting electrode is disposed inside the undercut shape and overlaps the first connecting electrode, and the third connecting electrode connects to both. This nested arrangement achieves multiple connection paths within a compact structure, preventing voltage drop without significantly complicating the manufacturing process
3Reliability
If multiple connecting electrodes are used to prevent voltage drop, then voltage stability improves, but the device structure becomes more complex
Solution Approach 1:
The passivation layer serves multiple functions: it provides electrical insulation between conductive elements and forms the undercut shape that defines the spatial arrangement of connecting electrodes. This multi-functionality reduces the need for additional structural elements, maintaining relatively simple device complexity while achieving improved voltage stability through multiple connecting electrodes
Data Source
AI summary
Provided is a display device including a voltage line, a passivation layer disposed on the voltage line and having an undercut shape, a first connecting electrode disposed inside the undercut shape, a second connecting electrode electrically connecting the voltage line and the first connecting line, and a common electrode electrically connected to the voltage line through at least one of the first connecting electrode and the second connecting electrode.