Crack Detection Line for Flexible Display Devices
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Solution Overview
Problem
Flexible display devices are prone to defects due to moisture permeation through cracks during manufacturing, which can lead to functional issues.
Innovation Solution
Incorporating a crack detection line with distinct height portions, positioned on and overlapping insulative step portions, to surround the display area and connect with data lines, enhancing crack detection and prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a crack detection line is positioned at the same height as surrounding structures, then the manufacturing process is simpler, but crack detection precision is reduced
Solution Approach 1:
The crack detection line is positioned at a different height than surrounding insulative structures, creating a localized height difference that enhances crack detection capability without requiring the entire device structure to be complex. This local differentiation allows the detection line to be more sensitive to cracks while maintaining overall manufacturing feasibility.
2Reliability
If the crack detection line completely surrounds the display area, then crack detection coverage is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The crack detection line is divided into multiple segments, with each segment positioned relative to insulative step portions. This segmentation allows the detection line to cover the display area effectively while simplifying the manufacturing process by breaking down the complex surrounding structure into manageable segments that can be manufactured and assembled more easily.
3Measurement precision
If insulative step portions are added to enhance crack detection, then detection capability is improved, but device complexity increases
Solution Approach 1:
The insulative step portions serve multiple functions: they provide electrical insulation, create height differences for enhanced crack detection, and define structural boundaries. By making these insulative structures multi-functional, the patent improves crack detection capability without adding separate dedicated components, thereby limiting the increase in overall device complexity.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area. The display device further includes a plurality of pixels in the display area of the substrate. The display device additionally includes a plurality of gate lines and a plurality of data lines respectively connected to the plurality of pixels. The display device further includes a plurality of insulative step portions disposed in the non-display area of the substrate and arranged in a first direction parallel to sides of the display area. The display device further includes a crack detection line in the non-display area and extending primarily in the first direction. The crack detection line includes a first portion which does not overlap the plurality of insulative step portions, and a second portion overlapping each of the insulative step portions.