Solution-Processed EL Display with Protrusion Connection Pattern
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Solution Overview
Problem
The existing electroluminescent display devices face challenges in manufacturing large-sized and high-definition displays due to increased costs and variations in the vacuum thermal evaporation process, particularly with the use of fine metal masks, which lead to issues like sagging and shadow effects.
Innovation Solution
The proposed solution involves an electroluminescent display device with a substrate, electrodes, and a connection pattern that includes protrusion parts, allowing for a light-emitting layer to be formed through a solution process without the need for a mask, thereby reducing manufacturing costs and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum thermal evaporation process with fine metal mask is used to form light-emitting layer, then manufacturing precision can be achieved, but manufacturing cost increases and manufacturing precision deteriorates due to mask sagging and shadow effects
Solution Approach 1:
The patent removes the fine metal mask from the manufacturing process entirely. Instead of using vacuum thermal evaporation with a mask, the invention employs a solution process where a light-emitting material solution is directly deposited and patterned on the substrate, eliminating mask-related costs and manufacturing complexities while achieving the desired light-emitting layer formation
Solution Approach 2:
The patent replaces the mechanical vacuum thermal evaporation process with a solution-based deposition method. This substitution eliminates the need for complex vacuum equipment and fine metal masks, using instead a more straightforward solution coating technique that achieves light-emitting layer formation without the associated mechanical complexities and costs
Data Source
AI summary
An electroluminescent display device comprises a substrate, a first electrode on the substrate, a connection pattern on the substrate and spaced apart from the first electrode, a bank covering edges of the first electrode and the connection pattern, a light-emitting layer on the first electrode, and a second electrode on the light-emitting layer, the bank and the connection pattern, wherein the connection pattern includes at least one protrusion part and a flat part, and wherein each of the first electrode and the connection pattern includes a first layer and a second layer, the second layer is disposed between the substrate and the first layer, and the second layer of the connection pattern has the at least one protrusion part.