Variable-Width Display Openings for Light Emitting Element Alignment
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Solution Overview
Problem
Current display device manufacturing processes face inefficiencies in aligning and integrating light emitting elements, leading to reduced process efficiency and increased costs due to difficulties in normal operation of light emitting elements within specific areas.
Innovation Solution
A display device design featuring a bank with distinct areas of different widths, where light emitting elements are aligned between alignment electrodes, and a method involving a first and second drying process to selectively position and secure the elements, enhancing alignment efficiency and reducing operational risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are placed in a uniform area without distinction, then the manufacturing process is simple, but the alignment precision and operational reliability are reduced
Solution Approach 1:
The opening area is segmented into a first area and a second area with different widths along the first direction. This segmentation allows light emitting elements to be selectively placed in the second area for better alignment precision while maintaining a relatively simple overall structure.
Solution Approach 2:
Different areas of the opening are given different widths to create local quality variations. The second area has a smaller width optimized for light emitting element placement and alignment, while the first area has a larger width for other functional requirements, thus improving alignment precision without unnecessarily complicating the entire structure.
2Manufacturing precision
If a single drying process is used, then the manufacturing process is fast, but the alignment accuracy and operational reliability of light emitting elements are compromised
Solution Approach 1:
The drying process is segmented into a first drying process and a second drying process. The first drying process removes solvent from the first area, and the second drying process removes solvent from the second area where light emitting elements are placed. This segmented approach improves alignment accuracy while minimizing the impact on overall process efficiency.
Solution Approach 2:
The first drying process is performed as a preliminary action before the second drying process. By partially drying the first area first, the structure is prepared for subsequent light emitting element placement and final drying, thereby improving alignment accuracy without significantly extending the total process time.
3Reliability
If light emitting elements are placed without area distinction, then the device structure is simple, but the operational reliability is reduced
Solution Approach 1:
The opening is segmented into distinct first and second areas with different widths. This segmentation ensures that light emitting elements are placed only in the optimized second area, improving operational reliability while maintaining a relatively simple overall device structure through clear area differentiation.
Solution Approach 2:
Local quality is applied by giving the second area a smaller width specifically optimized for light emitting element placement and operation. This local optimization improves operational reliability without requiring complex structural modifications throughout the entire device.
Data Source
AI summary
A display device includes: a bank on a base layer, the bank forming an opening; an alignment electrode layer on the base layer, the alignment electrode layer including a first alignment electrode and a second alignment electrode spaced from each other in a first direction; and a light emitting element between the first alignment electrode and the second alignment electrode. The opening includes a first area and a second area. The first area and the second area are arranged along a second direction different from the first direction. The first area has a first width along the first direction. The second area has a second width along the first direction. The first width is greater than the second width.