Timing Control Board Overvoltage Protection Circuit
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Solution Overview
Problem
Liquid crystal display panels are damaged due to power adapter mismatches, leading to electrical overstress and potential short circuits, which can cause a black screen and damage to the display panel.
Innovation Solution
A timing control driving board is designed with a power supply circuit, power supply management circuit, overvoltage protection circuit, and transient voltage suppressor, where the overvoltage protection circuit disconnects when the input voltage exceeds a preset voltage, preventing damage to the power supply management circuit and transient voltage suppressor, and including fuses and capacitors for additional protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 13V transient voltage suppressor is used to prevent electrical overstress, then protection against voltage spikes is improved, but the display panel is still damaged when a 19V power adapter is mistakenly connected
Solution Approach 1:
The patent implements voltage detection before the power adapter is fully connected to the display panel. The detection circuit measures the voltage of the power adapter in advance, and only allows connection when the voltage matches the required 12V specification. This preliminary detection prevents the harmful connection of incompatible 19V adapters before they can cause damage to the transient voltage suppressor or display panel.
2Device complexity
If the timing control driving board is designed with simple power supply circuitry, then device complexity is reduced, but overvoltage protection and short circuit prevention are insufficient
Solution Approach 1:
The patent introduces a detection circuit as an intermediary component between the power adapter and the timing control driving board. This detection circuit acts as a mediator that monitors the power adapter's voltage output and controls the connection state accordingly. The intermediary detection circuit enables intelligent discrimination between compatible and incompatible power adapters, providing reliable protection while maintaining a relatively simple overall system architecture.
3Loss of energy
If the power supply management circuit is directly connected to the power adapter, then power conversion efficiency is improved, but electrical overstress and short circuits can damage the circuit
Solution Approach 1:
The patent implements voltage detection and control before the power supply management circuit is activated. The detection circuit measures the power adapter voltage in advance and only enables the power supply management circuit when the voltage is confirmed to be the correct 12V. This preliminary action prevents electrical overstress from incompatible adapters while allowing efficient power conversion when the correct adapter is used.
Solution Approach 2:
The detection circuit serves as an intermediary between the power adapter and the power supply management circuit. It monitors the power adapter's output voltage and controls the connection state, enabling the power supply management circuit only when compatible adapters are detected. This intermediary mechanism protects against electrical overstress while maintaining efficient power conversion under normal operating conditions.
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 damage to the display panel by disconnecting the power supply circuit from the power supply management circuit and transient voltage suppressor when an incorrect power adapter is used, ensuring the display panel operates safely and reducing the risk of damage from mismatched power adapters.
Implementation Method 1
uses a transient voltage suppressor (TVS) of 13 v to prevent electrical over stress (EOS)
Implementation Method 2
the overvoltage protection circuit is disconnected when the input voltage is higher than a first preset voltage
Implementation Method 3
the power supply management circuit is configured to convert the input voltage into various voltages required for operation of the display panel
Data Source
AI summary
The present disclosure provides a timing control driving board, a display panel, and display device. The timing control driving board includes a power supply circuit, a power supply management circuit, an overvoltage protection circuit, and a transient voltage suppressor; a second end of the power supply circuit is connected to a first end of the overvoltage protection circuit; a second end of the overvoltage protection circuit is connected to a second end of the transient voltage suppressor and a second end of the power supply management circuit; and the overvoltage protection circuit is disconnected when an input voltage is higher than a first preset voltage.