OLED Color Conversion Alignment Marks for Inkjet Positioning
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Solution Overview
Problem
In the manufacturing of OLED display devices, the inkjet process for forming a color conversion layer can result in misplaced defects due to the inability to correct the position of the inkjet apparatus in real time, leading to reliability issues.
Innovation Solution
The display device incorporates a bank portion with alignment marks that indicate the starting point for the inkjet process, allowing for real-time correction of the inkjet apparatus position, thereby preventing defects and enhancing the reliability of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inkjet process is used to form the color conversion layer, then the manufacturing flexibility and color accuracy are improved, but the positioning precision deteriorates due to the inability to correct the inkjet apparatus position in real time
Solution Approach 1:
The patent applies preliminary action by pre-forming alignment marks and dummy openings in the bank portion before the inkjet process. These alignment marks serve as reference points that enable real-time position correction during inkjet printing, thus resolving the positioning precision issue while maintaining manufacturing flexibility
Solution Approach 2:
The patent implements feedback by using alignment marks and dummy openings as reference features that provide positional information during the inkjet process. This feedback mechanism allows the system to detect and correct positioning deviations in real time, thereby improving manufacturing precision without sacrificing the ease of manufacture
2Manufacturing precision
If alignment marks are added to the bank portion, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent merges the alignment marks and dummy openings directly into the bank portion structure, forming them as an integral unit. This integration approach improves positioning accuracy while minimizing the increase in device complexity by combining multiple functions into a single structure
Data Source
AI summary
A display device includes a first base substrate, a display structure, a second base substrate facing the first base substrate, a bank portion disposed between the first base substrate and the second base substrate in first and second areas and including openings overlapping the first and second areas, a color conversion layer disposed in the openings, and an alignment mark disposed in a corner opening among the openings disposed at at least one edge of the second area, positioned on a same line in a first direction as a center part of an opening adjacent to the corner opening among the openings in the first direction, and having a center part positioned on a same line in a second direction as a center part of an opening adjacent to the corner opening among the openings in the second direction intersecting the first direction.