MOSFET Switch Control Circuit for TFT-LCD Timing Board Protection
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Solution Overview
Problem
During the assembly of Thin Film Transistor Liquid Crystal Display (TFT-LCD) devices, flexible flat cables (FFCs) are often not properly connected to the timing control board, leading to potential damage due to improper connection, which can result in short circuits and burning of the operation circuit.
Innovation Solution
A control circuit with a timing control board and a printed circuit board (PCB) that includes a switch and specific connection terminals, where the switch is a metal oxide semiconductor (MOS) field effect transistor (FET), ensuring the operation circuit is powered only when the FFC is correctly connected, preventing short circuits and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If FFC is not properly connected to the timing control board, then assembly is simple and quick, but the operation circuit may be burnt down due to short circuit
Solution Approach 1:
The patent applies preliminary action by implementing a protection mechanism that is activated before damage can occur. The additional connection terminal and control circuit are pre-configured to detect improper FFC connection status before the operation circuit can be damaged, enabling preventive action rather than reactive protection.
Solution Approach 2:
The patent introduces an intermediary protection mechanism between the FFC connection and the operation circuit. The additional connection terminal, control circuit, and switching element act as intermediaries that monitor connection status and control power delivery, preventing direct exposure of the operation circuit to potential short circuit conditions.
2Reliability
If FFC is properly connected to the timing control board, then the operation circuit functions correctly, but improper connection causes short circuit and burning
Solution Approach 1:
The patent introduces an intermediary protection mechanism between the FFC connection and the operation circuit. The additional connection terminal, control circuit, and switching element act as intermediaries that monitor connection status and control power delivery, preventing direct exposure of the operation circuit to potential short circuit conditions.
Solution Approach 2:
The patent applies preliminary anti-action by implementing a protection mechanism that is activated before damage can occur. The additional connection terminal and control circuit are pre-configured to detect improper FFC connection status before the operation circuit can be damaged, enabling preventive action rather than reactive protection.
3Reliability
If a protection mechanism is added to prevent short circuit, then operation circuit safety is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing protection only at the specific location where connection errors occur (the FFC interface), rather than protecting the entire system uniformly. The additional connection terminal and control circuit are localized to the timing control board's connection interface, providing targeted protection with minimal added complexity.
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 control circuit effectively prevents the operation circuit from functioning or shutting down based on proper or improper connections, thereby avoiding short circuits and burning of the timing control board, ensuring safe and accurate operation.
Implementation Method 1
The switch is a metal oxide semiconductor (MOS) field effect transistor (FET)... When the first connection terminal is connected to the third connection terminal, the switch is turned on, the output terminal has the first voltage, and the operation circuit of the timing control board is powered to function.
Data Source
AI summary
The control circuit includes a PCB and a timing control board having a first connection terminal, a switch, and an operation circuit. The first connection terminal is connected to a control terminal of the switch turning on and off the switch. An input terminal of the switch has a first voltage and an output terminal is connected to the operation circuit. The PCB includes sequentially positioned second, third, and fourth connection terminals. The third connection terminal has a voltage different from those on the second and fourth terminals. When the first connection terminal is connected to the third connection terminal, the switch is turned on, the output terminal has the first voltage, and the operation circuit is powered to function. When the first connection terminal is connected to the other connection terminals, the switch is turned off, the output terminal has zero voltage, and the operation circuit stops to function.