Flexible Printed Circuit Board Separation Detection
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Solution Overview
Problem
Flexible printed circuit boards (FPCBs) in display devices can separate from the display panel due to elastic restoring forces, leading to potential detachment of critical elements, which is not effectively detected by existing technologies.
Innovation Solution
A display device design that includes a conductive layer, a flexible printed circuit board with a bending portion and a sensing pattern, and a driver chip to detect separation based on capacitance changes between the conductive layer and the sensing pattern, allowing for the detection of coupling and pressure sensor separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible printed circuit board (FPCB) is used to connect to the display panel, then the device achieves flexibility and ease of connection, but the FPCB may separate from the display panel due to elastic restoring force
Solution Approach 1:
The patent applies preliminary action by pre-installing a sensing pattern on the FPCB before assembly. This sensing pattern continuously monitors the connection status between the FPCB and display panel, enabling early detection of separation due to elastic restoring force. The detection capability is built into the structure beforehand, allowing the system to take preventive measures before complete detachment occurs.
Solution Approach 2:
The patent implements feedback through the sensing pattern that continuously monitors the distance or contact status between the FPCB and display panel. When separation is detected, this feedback signal can trigger alerts or corrective actions. The feedback mechanism closes the loop between the connection state and the control system, enabling real-time monitoring and response to maintain connection stability.
2Device complexity
If existing detection methods are used, then the device structure remains simple, but separation of the FPCB cannot be effectively detected
Solution Approach 1:
The patent replaces complex mechanical detection systems with a capacitive sensing approach. The sensing pattern uses electrical capacitance changes to detect separation, substituting mechanical switches or sensors with an electrical field-based detection method. This reduces mechanical complexity while improving detection precision, as capacitance changes can be measured with high sensitivity.
Solution Approach 2:
The patent utilizes parameter changes in capacitance to detect separation. By monitoring changes in capacitive values between the sensing pattern and the display panel, the system can detect separation events. This parameter-based detection method provides high measurement precision without requiring complex structural modifications, as it leverages inherent electrical property changes during separation.
3Ease of manufacture
If no sensing mechanism is added to the FPCB, then the manufacturing process remains simple, but critical elements may detach without detection
Solution Approach 1:
The sensing pattern serves multiple functions: it acts as both a structural element of the FPCB and a detection mechanism. The same conductive pattern that provides electrical connectivity also functions as the sensing element for detecting separation. This multi-functionality reduces the need for separate sensing components, maintaining manufacturing simplicity while improving reliability through continuous monitoring capability.
Solution Approach 2:
The FPCB performs self-detection of its own separation status through the integrated sensing pattern. The sensing pattern monitors the connection status of the FPCB itself without requiring external detection systems. This self-service approach allows the FPCB to autonomously detect its own detachment from the display panel, improving reliability without adding external monitoring infrastructure that would complicate manufacturing.
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 FPCB separation, reducing manufacturing defects and improving maintenance efficiency by using capacitance-based sensing patterns to monitor the connection status of critical components.
Implementation Method 1
a driver chip electrically connected to the first sensing pattern and configured to detect whether the coupling portion has been separated from either the second substrate portion or the conductive layer based on a capacitance that depends on a distance between the conductive layer and the first sensing pattern
Data Source
AI summary
A display device includes a display panel, a conductive layer disposed under the display panel, a first flexible printed circuit board including a first substrate portion having a side connected to the display panel, a bending portion extending from the first substrate portion, and a second substrate portion extending from the bending portion and disposed under the conductive layer. The second substrate portion includes a first sensing pattern. The display device further includes a coupling portion disposed between the second substrate portion and the conductive layer and coupling the second substrate portion and the conductive layer. The display device further includes a driver chip electrically connected to the first sensing pattern and configured to detect whether the coupling portion has been separated from either the second substrate portion or the conductive layer based on a capacitance that depends on a distance between the conductive layer and the first sensing pattern.