Display Panel Micro-Crack Detection via Signal Hopping
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Solution Overview
Problem
Current display panel manufacturing processes often result in micro-cracks on signal lines that do not affect initial performance but can lead to signal line breakage over time, causing display failure, necessitating a method to detect these micro-cracks before they cause issues.
Innovation Solution
A detection method for display panels involves providing a pulse signal to the signal line, using a switch unit to connect the signal line with data lines, and writing a truncated data signal to sub-pixels, where differences in brightness indicate a micro-crack, allowing for early detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional manufacturing processes are used, then production efficiency is maintained, but micro-cracks form on signal lines that are difficult to detect
Solution Approach 1:
The patent applies preliminary action by performing detection before the micro-crack causes complete failure. The method writes a first data signal to sub-pixels during manufacturing, stores the resulting brightness as reference data, and later compares it with brightness from a second data signal to detect micro-cracks before they lead to signal line breakage and display failure.
Solution Approach 2:
The patent uses parameter changes by varying the data signals written to sub-pixels (first data signal versus second data signal) and comparing the resulting brightness parameters. By changing the input signal parameters and measuring the output brightness parameter, the system can detect subtle changes caused by micro-cracks that would not be visible with conventional single-state testing.
2Reliability
If micro-cracks are not detected early, then initial display performance is maintained, but signal line breakage occurs after long-term usage
Solution Approach 1:
The patent implements feedback by storing reference brightness data obtained from writing a first data signal to sub-pixels, then comparing this reference data with brightness data obtained from writing a second data signal. This feedback mechanism allows the system to detect micro-cracks by identifying deviations from the expected brightness pattern, making previously undetectable micro-cracks visible through comparative analysis.
Solution Approach 2:
The patent performs preliminary detection action during the manufacturing or initialization phase by writing a first data signal and storing the brightness as reference data. This preliminary action establishes a baseline that enables future detection of micro-cracks before they progress to complete failures, addressing the difficulty of detecting subtle micro-crack effects.
3Measurement precision
If existing detection methods are used, then obvious cracks are detected, but micro-cracks with minimal resistance impact remain undetected
Solution Approach 1:
The patent applies self-service by using the display panel's own sub-pixels and data lines as the detection mechanism. Instead of requiring external specialized equipment, the system uses existing display components to write data signals, measure brightness, and detect micro-cracks through comparative analysis, thereby improving detection sensitivity without significantly increasing device complexity.
Solution Approach 2:
The patent demonstrates universality by making the display panel components serve dual functions: the data lines and sub-pixels are used both for normal display operation and for micro-crack detection. This multi-functionality allows the system to improve measurement precision for crack detection without adding separate dedicated detection hardware, thus avoiding excessive 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
This method enables the detection of micro-cracks in signal lines before they cause display failures, improving the reliability and performance of display panels by identifying and potentially addressing issues before they lead to panel malfunction.
Implementation Method 1
controlling, based on the data signal, at least one sub-pixel connected to the at least one data line to emit light
Data Source
AI summary
A detection method for a display panel, a display panel and a display device are provided. The display panel has a display area and a non-display area, and one data line in the display area is electrically connected to at least one sub-pixel; and the non-display area includes at least one signal line electrically connected to at least one data line through a switch unit. The method includes: providing a pulse signal to the signal line; controlling the switch unit to be turned on once in a period of at least one signal hopping on the signal line, to write a data signal into the data line through the signal line, where the data signal is the pulse signal truncated in the period of the signal hopping of the pulse signal; and controlling the sub-pixel connected to the data line to emit light.