Subpixel Bank Structure for Precise Light Emitting Element Alignment
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Solution Overview
Problem
Display devices face inefficiencies in aligning and minimizing the loss of light emitting elements in unwanted areas, leading to reduced display performance and increased manufacturing costs.
Innovation Solution
The design incorporates a display device structure with subpixels featuring emission areas, electrodes, insulating layers, and banks, where the second bank part is lower than the first bank part, and contact holes and contact portions are strategically positioned to align and secure light emitting elements efficiently, reducing misalignment and loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are aligned in unwanted areas during manufacturing, then alignment precision is improved, but loss of light emitting elements increases
Solution Approach 1:
The bank structure is divided into two distinct parts: a first bank part surrounding the emission area and a second bank part disposed inside the emission area. This segmentation allows each part to serve specific functions - the first bank part provides structural support and defines the emission boundary, while the second bank part facilitates precise alignment of light emitting elements without requiring them to be placed in unwanted areas, thereby reducing loss during manufacturing
Solution Approach 2:
The second bank part acts as an intermediary structure between the emission area and the light emitting elements. By providing a dedicated alignment structure within the emission area, it enables precise positioning of light emitting elements without needing to align them in unwanted areas, thus improving manufacturing precision while reducing element loss
2Device complexity
If bank structure is simplified to reduce manufacturing complexity, then device complexity is reduced, but alignment precision of light emitting elements deteriorates
Solution Approach 1:
The bank structure is segmented into two functional parts with different heights and positions. The first bank part (surrounding the emission area) and second bank part (inside the emission area) are structurally distinct but work together. This segmentation achieves precise alignment without requiring complex multi-layer or multi-component structures, maintaining manufacturing simplicity while improving precision
Solution Approach 2:
Different parts of the bank structure have different local qualities - the first bank part has a height designed for structural support and boundary definition, while the second bank part has a different height optimized for light emitting element alignment. This local differentiation allows each region to perform its specific function effectively, achieving precise alignment without overall structural complexity
Data Source
AI summary
A display device includes subpixels each comprising an emission area, electrodes which are disposed in the emission area, extend in a first direction, and are spaced apart in a second direction intersecting the first direction, a first insulating layer disposed on the electrodes, a first bank, and light emitting elements. The first bank includes a first bank part disposed on the first insulating layer and surrounding the emission area, and a second bank part connected to the first bank part and disposed in the emission area. The light emitting elements are disposed on the electrodes spaced apart in the second direction. A height of the second bank part of the first bank is lower than a height of the first bank part of the first bank.