Display Bank Groove Structure for Light Emitting Element Alignment
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Solution Overview
Problem
Existing display devices face challenges in efficiently forming emission and non-emission areas with precise alignment and separation of light emitting elements, leading to potential defects and inefficiencies in light emission.
Innovation Solution
A display device design featuring a concave groove with a dam structure on a bank and a second insulating layer on the sidewall, where the concave groove and insulating layer have different hydrophilic and hydrophobic surface characteristics, and the dam structure is formed within the groove to enhance alignment and separation of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional bank structure is used to define emission and non-emission areas, then the device complexity is reduced, but the alignment precision and separation of light emitting elements deteriorate
Solution Approach 1:
The bank structure is segmented by introducing concave grooves that divide the bank into multiple regions. This segmentation creates distinct zones for light emitting element placement, improving alignment precision by providing physical guides and separation structures within the bank itself.
Solution Approach 2:
The invention introduces vertical dimensionality to the bank structure by forming concave grooves with specific depths and profiles. This three-dimensional structuring enhances the separation and alignment capabilities beyond what a flat, two-dimensional bank surface could provide.
2Productivity
If light emitting elements are densely packed to increase productivity, then the output per unit area increases, but the risk of short circuits and defects increases
Solution Approach 1:
Concave grooves segment the bank structure to create physical barriers between adjacent light emitting elements. This segmentation maintains adequate separation even at high densities, preventing short circuits while allowing maximum packing efficiency.
Solution Approach 2:
The concave grooves act as intermediary structures between light emitting elements, providing isolation and preventing direct contact that could lead to short circuits. These grooves serve as protective barriers that enable higher density packaging without compromising reliability.
3Ease of manufacture
If the bank structure is simplified for ease of manufacture, then the manufacturing process becomes less complex, but the separation and alignment of emission and non-emission areas deteriorates
Solution Approach 1:
The concave grooves are formed in the bank structure during the manufacturing process before light emitting element placement. This preliminary structuring establishes precise alignment guides and separation zones in advance, ensuring accurate emission area definition without requiring complex post-processing steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves the alignment and separation of light emitting elements, reducing defects and enhancing the efficiency and lifespan of the display device by minimizing short circuits and ensuring uniform light emission.
Implementation Method 1
The second insulating layer and the concave groove may have different hydrophilic and hydrophobic surface characteristics
Implementation Method 2
The second insulating layer and the concave groove may have different hydrophilic and hydrophobic surface characteristics
Data Source
AI summary
A display device includes a first electrode and a second electrode disposed on a substrate; a first insulating layer disposed over the first electrode and the second electrode; a first bank and a second bank disposed on the first insulating layer and spaced apart from each other; and a light emitting element disposed between the first bank and the second bank. A top surface of the first bank may include a concave groove including a dam structure protruding in a first direction.