Flexible Display Crack Detection Lines on Encapsulation Layers
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Solution Overview
Problem
Flexible display panels are prone to cracks due to bending or twisting, which can lead to short-circuits, increased resistance, and moisture infiltration, causing operational failures such as non-functional or incorrectly lit pixels.
Innovation Solution
A display device with a substrate, display area, and peripheral area featuring an encapsulation layer, crack detection circuit, and crack detection lines on the encapsulation layer, along with a capping layer covering the edge of the encapsulation layer, to detect and prevent crack propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is made flexible to enable bending and twisting, then adaptability is improved, but reliability deteriorates due to crack propagation
Solution Approach 1:
The patent applies preliminary action by incorporating crack detection lines and detection circuits before the display panel is put into service. These detection lines are pre-installed in strategic locations where cracks are most likely to propagate, allowing the system to detect and respond to cracks early in their development stage, before they cause catastrophic failure.
Solution Approach 2:
The patent implements feedback through crack detection circuits that continuously monitor the structural integrity of the flexible display panel. When a crack is detected, the system receives feedback about the crack's location and severity, enabling real-time monitoring and potential corrective actions to maintain reliability despite the flexible nature of the device.
2Reliability
If crack detection lines are added to monitor structural integrity, then reliability is improved, but device complexity increases
Solution Approach 1:
The crack detection lines serve multiple functions: they act as both structural elements of the display panel and as sensing elements for crack detection. This multi-functionality reduces the need for separate dedicated sensing structures, thereby limiting the increase in device complexity while still providing reliable crack detection capability.
Solution Approach 2:
The detection lines utilize the existing electrical infrastructure of the display panel, drawing power and signal routing from the panel's own circuitry. This self-service approach allows the crack detection system to operate using the panel's existing resources without requiring entirely separate power and control systems, thus minimizing the added complexity.
Data Source
AI summary
A display device includes a substrate, a display area disposed on the substrate and including a plurality of pixels and data lines, a peripheral area disposed outside the display area of the substrate, a pad portion disposed in the peripheral area, an encapsulation layer disposed in the peripheral area and the display area, and disposed on the plurality of pixels of the display area, a crack detection circuit disposed in the peripheral area, and a first crack detection line connected with the pad portion and the crack detection circuit. The first crack detection line is disposed on the encapsulation layer.