OLED Display Crack Detection Lines with Inversely Tapered Cross-Sections
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Solution Overview
Problem
Cracks in flat or partially bent display devices can cause malfunctions, necessitating accurate crack detection methods.
Innovation Solution
Incorporation of crack detection lines with inversely tapered cross-sectional shapes in the non-display area of the display device, connected to test pads for resistance value comparison before and after manufacturing or bending processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional crack detection methods are used in flat or partially bent display devices, then crack detection is difficult and inaccurate, but the patent introduces crack detection lines with inversely tapered cross-sectional shapes to improve detection accuracy
Solution Approach 1:
The crack detection lines are formed in advance during the manufacturing process, before the display device is assembled or bent. This preliminary formation allows the detection lines to be positioned optimally within the stress-prone regions, enabling accurate crack detection while avoiding the need for additional complex detection systems to be added later
Solution Approach 2:
The crack detection lines have a specific inversely tapered cross-sectional shape that is optimized for their detection function. This localized structural modification at the detection line interfaces enhances stress concentration effects, making cracks more detectable without requiring similar modifications throughout the entire display device structure
2Reliability
If the display device is bent or flexed during manufacturing or use, then cracks may occur causing malfunction, but the patent incorporates crack detection lines to identify damage
Solution Approach 1:
The crack detection lines provide a feedback mechanism that allows manufacturers to identify cracks in the base layer after bending or flexing operations. By measuring resistance changes in these detection lines, the system feedbacks information about structural integrity, enabling defective devices to be identified and removed from production
Solution Approach 2:
The crack detection lines are formed in advance during the manufacturing process, before the display device is assembled or bent. This preliminary formation allows the detection lines to be positioned optimally within the stress-prone regions, enabling accurate crack detection while avoiding the need for additional complex detection systems to be added later
Data Source
AI summary
A display is provided. The display device includes a display area and a non-display area located around the display area; a base layer; an organic light-emitting diode (OLED) that is located on the base layer in the display area; and a first crack detection line that is located on the base layer in the non-display area; wherein the first crack detection line comprises a first line that extends substantially in a first direction along a first edge of the display area, a second line that is separated from the first line and extends substantially in the first direction, and a third line that is connected to an end of the first line and an end of the second line, wherein a cross-sectional shape of the first line in a second direction crossing the first direction is inversely tapered.