Auxiliary Line Structure for Higher-Current OLED Displays
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving high-quality image display due to inefficiencies in the arrangement and connectivity of electrodes and auxiliary lines, which can lead to overheating and reduced current density.
Innovation Solution
The display apparatus incorporates a novel structure with an auxiliary line comprising a main sublayer, lower and upper sublayers, a partition wall, and a second electrode that contacts the auxiliary line, along with a specific thickness and connectivity configuration to enhance electrical connections and reduce overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional auxiliary line structure is used, then the device complexity is low, but the current density is insufficient and overheating occurs
Solution Approach 1:
The auxiliary line is divided into multiple sublayers (lower sublayer, main sublayer, upper sublayer) with different materials and functions. This segmentation allows each sublayer to contribute differently to current conduction, thereby increasing overall current density while managing the complexity through functional division
Solution Approach 2:
The auxiliary line employs composite material structure with different conductive materials in each sublayer. The lower sublayer uses a first conductive material, the main sublayer uses a second conductive material, and the upper sublayer uses a third conductive material, creating a composite structure that optimizes electrical properties and reduces overheating
2Reliability
If the second electrode is isolated from the auxiliary line, then the manufacturing precision is easier to control, but the electrical connection quality deteriorates
Solution Approach 1:
The partition wall acts as an intermediary structure that facilitates controlled interaction between the second electrode and the auxiliary line. It provides a defined interface for electrical connection while maintaining manufacturing precision through its specific geometric configuration and positioning
Solution Approach 2:
The partition wall creates a localized connection region where the second electrode contacts the auxiliary line. This local quality approach allows precise control of the electrical connection at specific points while maintaining overall manufacturing precision
3Strength
If the partition wall thickness is increased, then the structural strength is improved, but the current density decreases
Solution Approach 1:
The partition wall thickness is optimized to a specific range (0.05μm to 0.5μm) to balance structural strength and electrical conductivity. This parameter optimization ensures the partition wall provides sufficient mechanical support while maintaining adequate current density for high-quality image display
Data Source
AI summary
A display apparatus includes an auxiliary line that includes a main sublayer, a lower sublayer arranged under the main sublayer, and an upper sublayer arranged over the main sublayer, a partition wall adjacent to the auxiliary line and that includes an opening corresponding to a side surface of the auxiliary line, a first electrode adjacent to the auxiliary line, a second electrode arranged over the first electrode and the auxiliary line, and an intermediate layer arranged between the first electrode and the second electrode and that includes an emission layer, wherein the upper sublayer of the auxiliary line includes a tip protruding in a lateral direction from a point where a side surface and an upper surface of the main sublayer meet each other, an upper end of the partition wall is spaced apart from the tip of the auxiliary line, and the second electrode contacts the auxiliary line.