Display Edge Bank Layout for Moisture-Resistant Dummy Openings
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Solution Overview
Problem
Current display devices face challenges in efficiently partitioning emission areas and dummy opening areas, leading to potential display failures due to sudden layout changes and moisture infiltration issues, particularly at the edge bank areas where reverse tapered faces can cause reliability problems.
Innovation Solution
The display device incorporates a substrate with a display area and a dummy area, featuring a pixel circuit layer, bank patterns, and a second bank with an edge bank that covers the inner side of the edge bank pattern and a portion of the first bank, along with a light conversion layer, to effectively partition emission and dummy opening areas. The edge bank has an outer inclined surface with a tapered face and an inner inclined surface with a reverse tapered face, reducing moisture infiltration and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light-emitting elements are arranged in non-display areas without proper partitioning, then the area utilization is increased, but the alignment precision and reliability of light emission deteriorate
Solution Approach 1:
The patent introduces a second bank structure that divides the non-display area into distinct emission areas and dummy opening areas. This segmentation allows light-emitting elements to be precisely positioned in emission areas while dummy openings are clearly separated, thereby maintaining alignment precision while effectively utilizing the non-display area.
Solution Approach 2:
The second bank creates different local regions with different functions: emission areas where light-emitting elements are positioned for light emission, and dummy opening areas that are filled with fill material to prevent light leakage. This local differentiation ensures that each area has the appropriate properties for its intended function, improving both alignment precision and overall reliability.
2Device complexity
If light-emitting elements are arranged without partitioning structures, then the device complexity is reduced, but the reliability of light emission deteriorates due to misalignment and display failures
Solution Approach 1:
The second bank partitions the non-display area into emission areas and dummy opening areas, creating a clear structural framework that guides the placement of light-emitting elements. This segmentation provides physical boundaries that ensure proper alignment and positioning, thereby improving light emission reliability without adding excessive complexity.
Solution Approach 2:
The second bank acts as an intermediary structure between the light-emitting elements and the substrate. It provides a stable platform for positioning light-emitting elements in emission areas while the dummy opening areas filled with fill material serve as intermediate regions that prevent light leakage and improve overall structural stability, enhancing reliability.
3Ease of manufacture
If the layout of light-emitting elements is not stabilized, then the ease of manufacture is improved, but the light emission efficiency deteriorates due to misalignment
Solution Approach 1:
The second bank creates clearly defined emission areas and dummy opening areas, providing a standardized layout template for arranging light-emitting elements. This segmented structure simplifies the manufacturing process by providing clear positioning guides, while simultaneously ensuring proper alignment that maximizes light emission efficiency.
Solution Approach 2:
The patent optimizes the geometric parameters of the second bank structure, including the size and position of emission areas and dummy opening areas. By carefully controlling these parameters, the design achieves both ease of manufacture through standardized dimensions and high light emission efficiency through optimal spacing and alignment of light-emitting elements.
Data Source
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AI summary
A display device includes a substrate including a display area including pixels, and a dummy area including dummy pixels, a pixel circuit layer including a transistor, and a via layer above the transistor, bank patterns above the via layer, light-emitting elements between the bank patterns in plan view, a first bank above a portion of the bank patterns, a second bank above the first bank, and including an edge bank defining an outermost boundary of the dummy area, covering an inner side of an edge bank pattern of the bank patterns overlapping the edge bank, and covering an inner side of a portion of the first bank that overlaps the edge bank, the first bank and the second bank partitioning emission areas and dummy opening areas, and a light conversion layer in the emission areas and in the dummy opening areas, which correspond to openings of the second bank.