Display Panel Crack Detection via Ground Line Electrical Testing
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Solution Overview
Problem
The difficulty in detecting small cracks in display panels during the cutting process, which can lead to panel failure, as cracks are often not visible to the naked eye, making quality inspection challenging.
Innovation Solution
A display panel design with a ground line and testing portions connected by a switch, allowing for the measurement of voltage, resistance, or current to determine if a crack exists by inputting a turn-off voltage and assessing the circuit integrity between the testing portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection by naked eye is used to detect cracks, then the inspection method is simple, but the detection precision is insufficient for small cracks
Solution Approach 1:
The patent replaces visual inspection (mechanical/optical system) with electrical measurement system. By substituting the naked eye observation with electrical resistance/conductivity measurement, the system can detect small cracks that are invisible to the human eye, thereby improving measurement precision while accepting increased device complexity
Solution Approach 2:
The patent changes the detection parameter from visual appearance to electrical properties (resistance, conductivity). By measuring electrical parameters between testing portions on opposite sides of the panel, the system can detect cracks through changes in electrical conductivity, enabling precise detection of small cracks that cannot be seen visually
2Reliability
If the ground line is used for crack detection, then the testing coverage is comprehensive, but the device complexity increases due to additional testing portions and switches
Solution Approach 1:
The ground line serves dual functions: it provides electrical grounding for the display panel during normal operation and acts as a testing pathway for crack detection. By making the ground line multi-functional, the patent improves detection reliability without proportionally increasing device complexity, as the same structural element serves both purposes
Solution Approach 2:
The testing portions and switch are pre-integrated into the panel structure during manufacturing. The ground line is预先 configured with testing access points, so that when crack detection is needed, the testing infrastructure is already in place and can be activated by the switch without requiring additional complex setup
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 reduces the difficulty of testing for cracks by identifying open circuits indicative of cracks through voltage, resistance, or current measurements, thereby ensuring the integrity of the display panel.
Implementation Method 1
a switch, wherein the switch is electrically connected between the first ground connecting portion and the first end
Implementation Method 2
measuring a voltage, a resistance, or a current between the first testing portion and the second testing portion
Implementation Method 3
measuring a voltage, a resistance, or a current between the first testing portion and the second testing portion; and determining whether a crack exists or not in the non-display region according to the measured voltage, resistance, or current
Data Source
AI summary
A display panel and a method for testing for an occurrence of a crack in a display panel are provided. The display panel includes a panel body, a ground line, a first ground connecting portion, a first testing portion, a second ground connecting portion, a second testing portion, and a switch. By measuring a voltage, a resistance, or a current between the first testing portion and the second testing portion, an open circuit in the ground line and a crack in a non-display area can be detected. Therefore, difficulty of confirming if a crack occurs in the display panel is reduced.