OLED Display Crack Detection With Inversely Tapered Lines
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Solution Overview
Problem
Cracks in flat and 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 straight crack detection lines are used, then the structure is simple, but cracks cannot be detected accurately
Solution Approach 1:
The crack detection line employs an inversely tapered cross-sectional shape where the width at the upper surface is greater than the width at the lower surface. This asymmetric geometry concentrates stress at the narrower lower portion, making the line more sensitive to cracks and enabling accurate detection while maintaining a relatively simple overall structure.
Solution Approach 2:
The crack detection line has different widths at different locations through its cross-section. The upper surface width is deliberately made larger than the lower surface width, creating localized stress concentration at the narrower lower portion. This local variation in geometry enhances crack detection sensitivity without requiring complete structural redesign.
2Reliability
If the crack detection line is made with uniform cross-section, then manufacturing is easy, but stress concentration for crack detection is insufficient
Solution Approach 1:
The cross-sectional dimensions of the crack detection line are varied along its length, specifically making the upper width greater than the lower width. This parameter change creates stress concentration zones that enhance crack detection sensitivity. The gradual tapering allows for controlled manufacturing while achieving the desired stress distribution for reliable crack detection.
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.