Bent Display Panel Cover Layer for Alignment Mark Recognition
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Solution Overview
Problem
Existing display devices face challenges in improving the recognition rate of alignment marks during the manufacturing process, particularly after bending operations, which can lead to reduced alignment accuracy and increased manufacturing costs.
Innovation Solution
A display device design that includes a cover layer covering the alignment mark, with specific dimensions and arrangements to ensure the alignment mark is recognizable even after bending, eliminating the need for additional protective films, and enhancing rigidity in the marked area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is bent to arrange the driver below the display area, then the driver layout is improved, but the recognition rate of the alignment mark deteriorates
Solution Approach 1:
The patent applies preliminary action by defining the alignment mark in the third area before the bending process, and by designing the cover layer to extend into the third area to cover the alignment mark. This preliminary configuration ensures that the alignment mark remains protected and recognizable even after the display panel is bent to reposition the driver below the display area.
2Measurement precision
If additional protective films are added to protect the alignment mark, then the alignment mark recognition rate is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by designing the cover layer to serve multiple functions: it covers and protects the alignment mark in the third area, provides structural support to maintain rigidity in the bent region, and eliminates the need for separate protective films. This multi-functional design simplifies the overall structure while ensuring the alignment mark remains recognizable.
Solution Approach 2:
The patent merges the protective function with the existing cover layer structure. Instead of adding a separate protective film specifically for the alignment mark, the cover layer is extended to cover the third area where the alignment mark is located, combining the protective function with the structural cover layer already present in the display device.
3Measurement precision
If additional protective films are added to protect the alignment mark, then the alignment mark recognition rate is improved, but the manufacturing cost increases
Solution Approach 1:
The cover layer is designed to serve multiple functions including protecting the alignment mark, providing structural support, and eliminating the need for additional protective films, thereby reducing manufacturing costs while maintaining alignment mark recognizability.
4Measurement precision
If the third area is made larger to accommodate the alignment mark, then the alignment mark recognition rate is improved, but the area available for other components is reduced
Solution Approach 1:
The patent applies local quality by concentrating the alignment mark and its protective cover layer in a specific local region (the third area) rather than distributing them across the entire display panel. This localized approach ensures high recognition rate for the alignment mark while minimizing the impact on the overall area available for other components.
Data Source
AI summary
A display device includes a display panel including a first area, a second area adjacent to the first area and bent with respect to a bending axis extending in one direction, and a third area adjacent to the second area and including an alignment mark, a cover layer below the third area of the display panel and covering the alignment mark, and a cover panel between the first area and the third area of the display panel and in contact with the display panel.