Display Panel Ground Line Crack Detection via Electrical Continuity
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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, along with thin film transistor switches, that allows for the measurement of voltage, resistance, or current to determine if a crack exists by creating an open circuit between the testing portions, indicating a crack in the non-display region.
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 introduces a ground line as an intermediary element that runs through the non-display region. This ground line serves as a mediator between the cutting process and the detection system - when a crack occurs during cutting, it disrupts the ground line's electrical continuity, which can then be detected through electrical measurement rather than visual inspection, thereby enabling precise detection of small cracks without complex imaging equipment
Solution Approach 2:
The patent replaces the mechanical/visual inspection system with an electrical detection system. Instead of using the naked eye or complex optical devices to visually detect cracks, the invention uses electrical continuity measurement of the ground line to detect crack presence. This substitution transforms the detection mechanism from optical/mechanical to electrical, achieving high precision with simpler measurement equipment
2Measurement precision
If complex testing equipment is used to detect small cracks, then the measurement precision improves, but the device complexity and testing cost increase
Solution Approach 1:
The patent segments the detection function into two parts: a passive ground line embedded in the display panel structure that serves as the sensing element, and a simple electrical measurement device that serves as the detection instrument. This segmentation allows the complex detection function to be distributed - the ground line does the sensing while the measurement device does the evaluation, making both manufacturing and detection simpler
Solution Approach 2:
The ground line serves multiple functions: it provides electrical grounding for the display panel during operation, and simultaneously serves as a crack detection sensor. This multi-functionality eliminates the need for separate dedicated detection structures, simplifying the overall manufacturing process while maintaining high detection precision
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 enabling the detection of open circuits, thereby identifying cracks in the display panel effectively, ensuring panel integrity.
Implementation Method 1
measuring a voltage, a resistance, or a current between the first testing portion and the second testing portion
Implementation Method 2
the first ground connecting portion and the first testing portion are parallel electrically connected to the first end
Data Source
AI summary
The present disclosure provides a display panel and a method for testing for occurrence of a crack in the display panel. 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, a first switch and a second switch, the ground line surrounds the display region, the first ground connecting portion and the first testing portion are parallel connected to one end of the ground line, the second ground connecting portion and the second testing portion are parallel to another end of the ground line, the first switch is electrically connected between the first ground connecting portion and one end of the ground line, the second switch is electrically connected between the second ground connecting portion and another end of the ground line.