Crack Detection in Rollable Display Devices
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Solution Overview
Problem
Current rollable display devices face challenges in detecting cracks without disassembly, which complicates inspection and reduces processing yield due to the need for cumbersome separation processes and increased time for crack detection.
Innovation Solution
Incorporating crack detection units and pads in non-active areas of the display device, allowing for crack detection without disassembling the device by using crack detection lines and pads connected to the gate driving unit, enabling precise crack position identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If crack detection is performed by disassembling the display device, then crack detection accuracy is improved, but device complexity and processing time increase
Solution Approach 1:
Crack detection units and pads are incorporated into the display device during the manufacturing process before final assembly. This preliminary integration allows crack detection to be performed without disassembly, eliminating the need for cumbersome separation processes while maintaining detection accuracy
Solution Approach 2:
A crack detection unit with conductive lines and pads is introduced as an intermediary element between the encapsulation substrate and the inspection system. This mediator enables non-invasive crack detection by providing electrical connectivity paths that change when cracks occur, allowing accurate detection without disassembling the device
2Measurement precision
If crack detection requires disassembly and separation processes, then crack position identification is improved, but processing yield decreases
Solution Approach 1:
The crack detection units are pre-integrated into the display device structure during manufacturing, with detection lines positioned to cover critical areas. This preliminary setup enables immediate crack detection during inspection without requiring time-consuming disassembly and reassembly operations, thereby improving processing yield
Solution Approach 2:
The display device structure itself is designed to incorporate the crack detection functionality through integrated detection units and conductive paths. The device essentially detects its own cracks through built-in sensing elements, eliminating the need for external disassembly procedures and improving inspection efficiency
3Reliability
If crack detection units are added to the display device, then crack detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The gate driving unit and its conductive structures serve dual functions: driving the display pixels and detecting cracks. By making the conductive lines and pads serve both driving and detection purposes, the need for entirely separate detection components is reduced, balancing improved crack detection capability with reasonable manufacturing cost
Solution Approach 2:
The electrical parameters (resistance, conductivity) of existing conductive structures are utilized for crack detection. By monitoring changes in these parameters when cracks occur, the system achieves reliable crack detection without requiring expensive specialized sensors, maintaining ease of manufacture while improving detection capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies crack inspection, improves processing yield by minimizing additional processes and costs, and allows for crack detection without removing the encapsulation substrate, reducing processing time and worker requirements.
Implementation Method 1
a crack detection line extending from one side to the other side of the gate driving unit in a direction crossing a longitudinal direction of the gate driving unit, wherein the crack detection line is disposed on the flexible substrate
Data Source
AI summary
A display device is disclosed that includes one or more crack detection units. The crack detection units can detect a crack position in the display device without requiring the disassembly of the display device. The crack detection units may be disposed across one or more non-active areas of the display device.