Display Panel Connection Detection Circuit Prevents Short Circuits
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Solution Overview
Problem
In display devices, when the display panel and printed circuit board are not electrically connected, there is a risk of short circuits and circuit failures due to unintended output from the signal controller and power supply, which can also facilitate reverse engineering.
Innovation Solution
A display device with a clock signal generator that produces a gate clock signal and a panel separation signal, which compares the voltage of the gate clock signal with a reference voltage to determine electrical connection, and stops the output of the signal controller and power supply if the panel is not connected, preventing short circuits and output when disconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal controller and power supply continuously output signals and power, then the display device can operate without interruption, but short circuits and circuit failures may occur when the display panel is not connected
Solution Approach 1:
The system performs preliminary detection of panel connection status before enabling full output operations. The detection circuit checks whether the display panel is properly connected to the printed circuit board, and only after confirming connection does the signal controller and power supply begin normal signal and power output. This prevents short circuits while maintaining operational continuity.
Solution Approach 2:
The system implements a feedback mechanism where the detection circuit continuously monitors the connection status between the display panel and printed circuit board. Based on this feedback information, the signal controller and power supply dynamically adjust their output states - enabling output when connected and disabling when disconnected - thereby preventing short circuits while ensuring operational continuity during normal use.
2Reliability
If the signal controller and power supply are disabled when panel is disconnected, then short circuits are prevented, but the system cannot quickly resume operation when panel is reconnected
Solution Approach 1:
The detection circuit is activated in advance and continuously monitors the connection status. When the display panel is reconnected, the detection circuit immediately detects the connection state and triggers the signal controller and power supply to resume output operations without requiring manual intervention or system reboot, thus preventing short circuits while minimizing resume time.
Solution Approach 2:
The system uses real-time feedback from the detection circuit to dynamically control the output states of the signal controller and power supply. When connection is detected, the feedback signal immediately enables resumption of normal operations. This ensures circuit safety during disconnection while allowing rapid resume when the panel is reconnected.
3Ease of manufacture
If connection pads and exposed wires are accessible when disconnected, then the device can be serviced or reconfigured, but reverse engineering and unauthorized access become possible
Solution Approach 1:
The system applies preliminary anti-action by detecting the connection status and automatically disabling the signal controller and power supply output when disconnection is detected. This prevents unauthorized access and reverse engineering attempts on exposed wires and connection pads, while still allowing serviceability when properly connected through authorized interfaces.
Solution Approach 2:
The detection circuit provides continuous feedback on connection status. When disconnection is detected, the feedback signal triggers immediate disabling of output signals and power, preventing reverse engineering and unauthorized access to exposed wires and connection pads. This maintains serviceability through proper connection interfaces while blocking unauthorized access when disconnected.
4Reliability
If a detection circuit is added to monitor connection status, then short circuits are prevented, but device complexity increases
Solution Approach 1:
The detection circuit is designed to serve multiple functions: it detects connection status, generates control signals for the signal controller and power supply, and can potentially monitor other system states. By making the detection circuit multi-functional, the patent reduces overall device complexity while achieving short circuit prevention through a single integrated component rather than multiple separate circuits.
Solution Approach 2:
The detection circuit functionality is merged with the existing control architecture of the display device. The detection circuit is integrated into the signal path and control logic, sharing resources with other system components. This merging approach prevents short circuits while minimizing the increase in device complexity by avoiding separate standalone detection systems.
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
Prevents circuit failures and reduces the risk of reverse engineering by ensuring that the signal controller and power supply do not output when the display panel and printed circuit board are not connected, maintaining operational safety and security.
Implementation Method 1
a panel separation detection circuit configured to generate the panel separation signal by comparing a detection voltage detected from the clock line with the first reference voltage during the falling period
Data Source
AI summary
A display device includes a display panel, a power supply, a signal controller configured to generate first and second clock signals having a period, a clock signal generator configured to generate a gate clock signal that is raised to a high level voltage in synchronization with the first clock signal, and that falls to a low level voltage in synchronization with the second clock signal, generate a panel separation signal by comparing a voltage of the gate clock signal with a first reference voltage during a falling period during which the gate clock signal falls, and transfer the panel separation signal to the power supply or the signal controller, and a gate driver configured to sequentially apply a gate signal by using the gate clock signal, wherein the power supply or the signal controller is configured to stop outputting depending on the panel separation signal.