Flexible Display Bending Region Adhesive Evaluation Pattern
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Solution Overview
Problem
Flexible display devices face challenges in accurately evaluating the bending region's physical characteristics and processing accuracy, particularly due to residual adhesive contamination and stress issues, which can lead to defects and reduced durability.
Innovation Solution
Incorporating a pattern of electrodes in the bending region with a protection layer, positioned between connection wires and the substrate, to quantify residual adhesive and relieve bending stress, allowing for improved measurement and evaluation through vision inspection and automated processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection film is removed from the bending region to reduce bending stress, then the reliability of the bending region is improved, but it becomes difficult to accurately evaluate residual adhesive contamination
Solution Approach 1:
A pattern is formed in the bending region before the protection film is removed. This pattern serves as a reference for evaluating residual adhesive contamination after the protection film is removed, enabling accurate measurement despite the film's absence and the resulting bending stress relief
Solution Approach 2:
The pattern includes elements with different reflectivity (e.g., light and dark regions) that create visible contrast. When viewed through vision inspection, the residual adhesive appears differently compared to the pattern background, enabling accurate detection and quantification of adhesive contamination levels
2Device complexity
If the bending region is designed to be compact with reduced dead space, then the device complexity is reduced, but it becomes difficult to accurately evaluate processing characteristics and physical properties
Solution Approach 1:
A specific pattern is introduced only in the bending region, not throughout the entire display device. This localized pattern enables targeted evaluation of the bending region's processing characteristics and physical properties without adding overall device complexity, maintaining compactness while improving measurability
Data Source
AI summary
A display device according to an exemplary embodiment includes a display panel including a display area and a bending region. The display panel in the bending region includes a plurality of connection wires, a pattern including a plurality of electrodes, and a protection layer positioned between the plurality of connection wires and the pattern.