Display Panel Cable Short Detection via Isolated Signal Ground
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Solution Overview
Problem
Existing information handling systems lack a dedicated method to detect cable shorts, leading to unnecessary replacements of display panels and motherboards during field service, which increases costs and risks consumer safety.
Innovation Solution
Incorporating a short circuit detection circuit between the signal ground conductor and the system ground in the cable assembly, which uses a high-pass circuit path and a DC current detection circuit to isolate the signal ground and detect short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no short circuit detection circuit is installed, then the device complexity is low, but cable shorts cannot be detected leading to unnecessary replacements and safety risks
Solution Approach 1:
The detection function is segmented into a dedicated short circuit detection circuit that is separate from the main system ground path. This circuit includes a high-pass filter path and a DC current detection path, dividing the detection task into frequency-based components that can be independently processed and analyzed.
Solution Approach 2:
A dedicated short circuit detection circuit acts as an intermediary between the signal ground conductor and system ground. This intermediary circuit detects short conditions without disrupting the normal operation of the display cable system, providing fault information to the controller for appropriate action.
2Ease of repair
If a short circuit detection circuit is installed, then cable faults can be detected early, but the device complexity increases
Solution Approach 1:
The short circuit detection functionality is extracted as a separate, dedicated circuit rather than being integrated into existing system circuits. This extraction allows the detection function to be implemented with minimal impact on existing system architecture while providing accurate fault identification capability.
Solution Approach 2:
The detection circuit uses the existing cable conductors (signal ground and power ground) as part of its detection path, allowing the system to self-diagnose cable faults without requiring external test equipment or additional wiring beyond the detection circuit components themselves.
3Object-affected harmful factors
If the signal ground is directly connected to system ground, then the circuit is simple, but short circuits cannot be isolated and may damage other components
Solution Approach 1:
The short circuit detection circuit serves as an intermediary monitoring system between the signal ground and system ground, detecting short conditions before they can propagate damage to other system components. The controller acts as a second intermediary that responds to detection signals by isolating faulty cables.
Solution Approach 2:
The detection circuit provides preliminary detection of short circuit conditions before significant damage can occur. The controller then takes preliminary protective action by identifying and isolating faulty cables, preventing the short circuit from affecting other system components.
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
The solution enables early detection of cable shorts, reducing the need for unnecessary replacements, lowering field service costs, and enhancing consumer safety by isolating faulty cables and preventing damage to other system components.
Implementation Method 1
uses a high-pass circuit path and a DC current detection circuit to isolate the signal ground and detect short circuits
Implementation Method 2
uses a high-pass circuit path and a DC current detection circuit to isolate the signal ground and detect short circuits
Data Source
AI summary
An information handling system includes first and second printed circuit boards (PCBs) and a cable coupled at a first end to the first PCB and at a second end to the second PCB. The cable includes a power conductor, a ground conductor, and a signal ground conductor. The second PCB includes a power rail coupled to the power conductor, a system ground coupled to the ground conductor, and a short circuit detector coupled between the signal ground conductor and the system ground.