Protective Circuit for Display Panel Short Circuit Prevention
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Solution Overview
Problem
In the manufacturing process of active array switch display panels, short circuits between high-voltage signals and grounding occur due to foreign matter, causing the panel to heat up and potentially burn.
Innovation Solution
A protective circuit is implemented, featuring a control line, a transmission line with an input and output line, and an active switch, where a thermo-sensitive conductive material wire is used between the input and output lines. The active switch, typically an N-MOS field-effect transistor, forms a closed circuit at low control signal potential and breaks the circuit when power exceeds a threshold, preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-voltage signal lines are arranged in fan-out areas during manufacturing, then signal transmission capability is improved, but susceptibility to short circuits from foreign matter increases
Solution Approach 1:
A protected wire is introduced as an intermediary component between the input line and output line. This protected wire acts as a mediator that can be selectively fused to disconnect the circuit when foreign matter causes excessive current, while allowing normal signal transmission when healthy. The protected wire thus mediates between the conflicting requirements of maintaining circuit connectivity and preventing short circuit damage.
2Reliability
If foreign matter protection measures are added to prevent short circuits, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The protection function is merged with the existing signal transmission line by integrating the protected wire directly into the transmission path between input and output lines. Rather than adding separate protection circuits or shielding structures, the protected wire serves dual purposes: normal signal conduction and fault protection. This merging approach provides reliable short circuit protection while avoiding significant increases in device complexity.
3Reliability
If a protected wire is added between input and output lines, then short circuit protection is improved, but manufacturing process complexity increases
Solution Approach 1:
The protected wire is designed as a sacrificial, disposable component that is intentionally made vulnerable to fusion under fault conditions. It uses materials with controlled melting points that allow it to fuse reliably when exposed to excessive current from short circuits, thereby protecting more critical and expensive components like the display panel. This approach provides robust protection while maintaining manufacturing simplicity, as the protected wire can be easily integrated and replaced if needed.
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 solution effectively prevents overheating and panel damage from short circuits without altering the existing production process or increasing costs, while allowing for recovery of functionality after repair.
Implementation Method 1
when the input line obtains power greater than a maximum power threshold the protected line can bear, the protected line is fused
Data Source
AI summary
This application provides a protective circuit and a display device. The protective circuit includes a control line, a transmission line, and an active switch. The control line transmits a control signal; the transmission line includes an input line and an output line; and a control end of the active switch is electrically coupled to the control line, a first end of the active switch is connected to the input line, and a second end of the active switch is connected to the output line. A protected wire is arranged between the input line and the output line.