OLED Connection Wiring Layout to Minimize Display Afterimages
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Solution Overview
Problem
Display devices suffer from afterimage defects due to the connection issues between light emitting elements and circuits, which affect the reliability and longevity of the display panel.
Innovation Solution
The display device incorporates a base layer with voltage lines, a transistor, a light emitting element, and a connection wiring line with a protruding tip portion that electrically disconnects the cathode, along with insulating layers and capping patterns to enhance electrical connectivity and reduce afterimage defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection wiring line is directly connected to the light emitting element, then electrical connectivity is achieved, but afterimage defects occur due to connection issues
Solution Approach 1:
The connection wiring line is divided into multiple layers (first layer, second layer, third layer) with the third layer including a tip portion that protrudes to electrically disconnect the cathode. This segmentation allows the wiring structure to achieve both electrical connectivity and prevention of afterimage defects by separating the connection functions.
Solution Approach 2:
The connection wiring line transitions from a planar two-dimensional structure to a three-dimensional structure with the tip portion protruding from the side surface of the second layer. This dimensional change enables the wiring to achieve both electrical connection and cathode disconnection functions simultaneously, resolving the afterimage defect issue.
2Ease of manufacture
If the connection wiring line structure is simplified, then manufacturing is easier, but electrical connectivity and reliability are compromised
Solution Approach 1:
The connection wiring line is segmented into three distinct layers, where each layer serves a specific function. The first layer provides base connection, the second layer provides additional connectivity, and the third layer with the tip portion provides cathode disconnection. This segmentation maintains manufacturing simplicity while ensuring reliable electrical connectivity.
Solution Approach 2:
The third layer of the connection wiring line has a localized protruding tip portion that specifically targets the cathode area for electrical disconnection. This local quality modification allows the majority of the wiring structure to remain simple and easy to manufacture, while only the critical tip area has the enhanced three-dimensional structure needed for reliability.
Data Source
AI summary
A display device including a base layer, a plurality of voltage lines and a transistor that are disposed on the base layer, a light emitting element electrically connected to the transistor and including a cathode, and a connection wiring line electrically connected to the light emitting element and including a first connection part spaced apart from a light emitting opening defined in the light emitting element, and a second connection part electrically connected to the transistor. The first connection part overlaps some of the plurality of voltage lines in plan view.