OLED Crack Detection Line Routing and Reset Signal Segmentation
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Solution Overview
Problem
Current display technologies face challenges in detecting subtle cracks in film layers of OLED display panels, which can lead to package leakage and material failure, especially in narrow-frame displays where crack detection lines cannot be turned off during electrical detection, resulting in false detection and missed cracks.
Innovation Solution
A display panel design that includes a crack detection line connected to the reset signal terminal of the pixel driving circuit, allowing for crack detection by applying a crack detection signal through the reset signal line, which reduces the influence of voltage drop on brightness and improves detection accuracy by using multiple reset signal lines and a snake-shaped crack detection line configuration to enhance crack detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a crack detection line is used in narrow-frame displays, then crack detection capability is provided, but false detection occurs and detection accuracy deteriorates because the detection line cannot be turned off during electrical detection
Solution Approach 1:
The patent extracts the crack detection line from the active display area and places it in the non-display area (peripheral area). This separation allows the detection line to be independently controlled and turned off during electrical detection, eliminating false detections while maintaining crack detection capability in the peripheral region.
Solution Approach 2:
The detection system is segmented into separate functional zones: the active display area for image output and the non-display peripheral area for crack detection. This segmentation allows different operational modes - the crack detection line can be activated for crack detection while being deactivated during electrical detection, resolving the contradiction between detection accuracy and false detection rates.
2Device complexity
If a simple linear crack detection line is used, then device complexity is reduced, but detection sensitivity deteriorates due to voltage drop effects
Solution Approach 1:
The patent employs a snake-shaped (curved) crack detection line configuration instead of a simple linear path. This curved routing increases the detection line's length and coverage area in the peripheral region, enhancing crack detection sensitivity by distributing the detection function across multiple segments while managing voltage drop effects through the extended path.
3Measurement precision
If multiple reset signal lines are used to reduce voltage drop, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The reset signal transmission is segmented into multiple parallel signal lines rather than using a single line. This segmentation reduces the voltage drop effect by distributing the current load across multiple paths, thereby improving detection accuracy. The multiple reset signal lines are configured to work together to maintain stable voltage levels at the pixel driving circuit.
Solution Approach 2:
The multiple reset signal lines serve dual functions: they provide reset signals to the pixel driving circuits during normal operation and simultaneously serve as crack detection lines during detection modes. This multi-functionality reduces device complexity by reusing existing signal lines for detection purposes without requiring entirely separate detection circuitry.
Data Source
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AI summary
A display panel, a display device and a detection method are provided. The display panel (10) includes a display area (100) and a peripheral area (200) surrounding the display area (100). Pixel units (110) arranged in an array are disposed in the display area (100). The pixel unit (110) includes a pixel driving circuit. A crack detecting line (300) is disposed in the peripheral area, and the crack detecting line (300) is connected to a reset signal terminal (VINT) of the pixel driving circuit of at least one pixel unit. The display panel (10) can reduce the influence of the voltage drop over the crack detection line on the brightness during the electrical detection stage, and can also improve the crack detection rate of the peripheral area (200).