Hole Crack Detection Lines for Flexible Display Inspection
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Solution Overview
Problem
Display panels with holes, such as those used in flexible displays, are prone to cracks due to manufacturing or usage-related bending, which can lead to poor display quality and reliability issues like disconnected signal lines and moisture penetration.
Innovation Solution
A display device with a hole crack detection system that includes a hole crack detection line surrounding the hole area, connected to detection lines and a test controller, which applies test voltages to detect cracks by emitting light through specific data lines, indicating the presence of defects visually.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a hole is formed in the display panel to accommodate devices like cameras and sensors, then the display area is maximized and non-display area is minimized, but cracks may occur during hole formation or due to bending, leading to disconnected signal lines and reduced reliability
Solution Approach 1:
The patent applies preliminary action by forming detection lines and test circuits during the manufacturing process before the display panel is put into service. These detection lines are pre-configured to monitor crack development, allowing early detection of reliability issues before they affect actual operation. The test controller and detection circuits are built-in from the start, enabling proactive quality assurance.
Solution Approach 2:
The detection lines act as intermediaries between the structural integrity of the display panel and the control system. These specialized test lines are inserted into the signal transmission path, serving as mediators that can detect cracks without interfering with normal display operations. The test controller uses these intermediary detection lines to indirectly monitor the health of critical signal lines like data and gate lines.
2Adaptability or versatility
If flexible display panels are designed to be curved or bent during manufacture or use, then adaptability and versatility are improved, but minute cracks may develop into larger cracks, compromising structural integrity
Solution Approach 1:
The detection lines are pre-installed during manufacturing to monitor crack development before flexibility issues arise. This preliminary monitoring system allows the panel to be tested in various bent states during production, identifying weak points before the product reaches the customer. The system proactively detects early-stage cracking that occurs during flexible operations.
Solution Approach 2:
The detection lines provide continuous feedback about the structural integrity of the flexible display panel. When bending causes stress concentration and initiates cracks, the detection lines detect these changes and transmit signals to the test controller. This feedback mechanism enables real-time monitoring of crack development, allowing users to identify when flexibility has compromised strength.
3Measurement precision
If detection lines are added to monitor cracks in the display panel, then measurement precision and reliability are improved, but device complexity increases
Solution Approach 1:
The detection lines are designed to serve multiple functions: they can detect cracks in the substrate, monitor the integrity of stacked layers, and test both data and gate lines simultaneously. The same detection line infrastructure supports various test modes and can identify different types of defects. This multi-functionality reduces the need for separate specialized sensors for each detection task.
Solution Approach 2:
The detection lines are merged with the existing signal line infrastructure of the display panel. Rather than adding completely separate external monitoring systems, the patent integrates detection functionality into the panel's native conductive layers. The detection lines share physical space and functional pathways with regular data and gate lines, consolidating multiple functions into a unified structure that minimizes added complexity.
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
Effectively detects cracks in the display panel, ensuring the reliability of the display device by identifying defects before they cause significant issues, thereby maintaining image quality and panel integrity.
Implementation Method 1
A test controller is configured to electrically connect the first detection receiving line to a first data line of the plurality of data lines and the second detection receiving line to a second data line of the plurality of the data lines
Implementation Method 2
A first detection line includes a first detection transfer line connected to the first end of the hole crack detection line and a first detection receiving line connected to the second end of the hole crack detection line
Data Source
AI summary
A display device includes a display area configured to include a plurality of pixels and a plurality of data lines connected to the pixels. A hole area is disposed within the display area. A hole crack detection line is disposed adjacent to the hole area and surrounds the hole area. The device includes first and second detection lines which include first and second detection transfer lines and first and second detection receiving lines, respectively. A test controller electrically connects the first detection receiving line to a first data line and the second detection receiving line to a second data line. Pixels connected to the first data line that is connected to a first bright-line transistor and pixels connected to the second data line that is connected to a second bright-line transistor are configured to emit light when a crack occurs in the hole crack detection line.