Crack Detecting Lines in Display Peripheral Area
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Solution Overview
Problem
Display devices face challenges in detecting cracks effectively, particularly in flexible substrates where minute cracks can enlarge due to bending or curving, leading to moisture penetration and display defects.
Innovation Solution
A display device with integrated crack detecting lines and pads connected to a driving IC, which applies different currents to detect resistance changes in crack detecting lines to determine the presence and severity of cracks, allowing for accurate crack detection without increasing the number of bits for resistance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crack detecting lines are added to detect cracks in display panels, then crack detection capability is improved, but device complexity increases
Solution Approach 1:
The crack detecting lines are integrated into the existing peripheral area circuit structure, merging the crack detection function with the existing display device architecture. The detecting lines share pads and routing paths with other display components, avoiding separate dedicated detection circuits and reducing overall structural complexity.
Solution Approach 2:
The peripheral area circuit structure serves multiple functions: it provides drive signals for display operation and simultaneously acts as crack detection pathways. The same pads and routing structures used for normal display operation are utilized for crack detection, enabling one structure to perform multiple functions without adding proportional complexity.
2Measurement precision
If multiple crack detecting lines are added to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The crack detection system is divided into multiple detecting lines positioned at different locations within the peripheral area. Each line segments the detection task, covering different regions or aspects of potential cracking. This segmentation enables comprehensive detection without requiring a single complex detection system, maintaining simplicity while improving precision through distributed measurement points.
3Reliability
If resistance measurement is used to detect cracks, then crack detection capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system utilizes resistance as a detectable parameter that changes in response to crack formation. By monitoring resistance changes in the detecting lines, the system can identify cracks without requiring complex measurement systems. The resistance parameter provides a straightforward metric that is easy to measure and interpret, reducing the precision requirements for manufacturing and measurement infrastructure.
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
Enables reliable detection of cracks in display panels, including those with flexible substrates, by accurately measuring resistance changes, thus preventing moisture penetration and ensuring display integrity.
Implementation Method 1
A display device with integrated crack detecting lines and pads connected to a driving IC, which applies different currents to detect resistance changes in crack detecting lines to determine the presence and severity of cracks
Data Source
AI summary
A display device including: a substrate including a display area and a peripheral area peripheral to the display area; a plurality of pads disposed in a pad area, wherein the pad area is disposed in the peripheral area and the pad area includes an integrated circuit (IC); and a first crack detecting line connected to a first pad and a second pad at a first node, and a third pad at a second node, wherein the first crack detecting line is disposed in the peripheral area between the first node and the second node.