Organic Light-Emitting Display Alignment Mark Venting
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Solution Overview
Problem
Existing organic light-emitting display apparatuses face issues with air bubbles trapping around alignment marks during the attachment of protective films, leading to failure in recognizing the alignment marks in subsequent processes, which affects the lamination quality.
Innovation Solution
The organic light-emitting display apparatus includes a substrate with a display area and a peripheral area, featuring an alignment mark with a first opening and slits that extend from it, allowing exposure and air discharge, and a pixel electrode with a conductive pattern, along with a pixel-defining film that separates in the display and peripheral areas to facilitate clear alignment and attachment of the protective film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is attached to prevent or reduce damage to the emission layer during manufacturing, then the emission layer is protected from damage, but air bubbles are trapped around the alignment mark, leading to failure to recognize the alignment mark in subsequent processes
Solution Approach 1:
The insulating film is segmented by forming slits that extend from the first opening to the edge of the substrate. This segmentation allows air bubbles to escape during protective film attachment while maintaining the integrity and protective function of the insulating film structure.
Solution Approach 2:
The slits in the insulating film act as intermediary pathways that facilitate air bubble discharge. These slits provide a controlled channel for air to escape during the lamination process, preventing air bubble entrapment around the alignment mark while preserving the protective function of the insulating film.
2Measurement precision
If the inner surface of the first opening is spaced apart from the edge of the alignment mark, then the alignment mark is exposed for recognition, but the structural integrity of the insulating film is compromised
Solution Approach 1:
The insulating film is divided into segments by forming slits that extend from the first opening. This segmentation allows the inner surface to be spaced from the alignment mark edge for exposure purposes while the segmented structure maintains overall film integrity through distributed support.
Solution Approach 2:
The insulating film has different local properties: the main body provides structural integrity and protection, while the slits create localized openings for air discharge. This local differentiation allows the film to simultaneously maintain strength and enable alignment mark exposure.
Data Source
AI summary
An organic light-emitting display apparatus includes: a substrate including a display area and a peripheral area outside the display area; an alignment mark located in the peripheral area; and an insulating film located in the peripheral area and including a first opening through which at least a part of the alignment mark is exposed and a plurality of slits that extend from the first opening.