Electrostatic Protection Circuit With Clamped ESD Shutdown Hold
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Solution Overview
Problem
Display terminal products experience flickering and blurry screens due to repeated interference from excessively high electrostatic discharge (ESD) sources, causing poor display performance.
Innovation Solution
An electrostatic protection circuit with a clamping module that continues to output a high electrical potential when the electrostatic detection signal transitions from low to high, ensuring the power management unit stops operating and preventing abnormal screen displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrostatic detection signal is directly conducted to the power management unit, then the power management unit can respond to ESD events, but repeated high ESD interference causes the screen to flicker and blur due to continuous power supply cycling
Solution Approach 1:
The patent applies preliminary action by introducing a clamping module that anticipates and prepares for repeated ESD interference. When ESD is detected, the clamping module proactively clamps the fault detection signal to maintain a stable high-level state, preventing the power management unit from repeatedly cycling between on and off states before the screen can be properly shut down. This preliminary clamping action eliminates the harmful flickering effect caused by signal instability during repeated ESD events.
2Object-affected harmful factors
If the power management unit stops supplying power immediately when ESD is detected, then the screen is protected from damage, but repeated ESD events cause the screen to constantly brighten and darken
Solution Approach 1:
The patent introduces a clamping module as an intermediary between the electrostatic detection signal and the power management unit. This intermediary component processes the fault detection signal by clamping it to a stable high-level state when ESD is detected, rather than allowing direct transmission of the raw detection signal. The clamping module acts as a mediator that translates the ESD detection into a stable control signal, preventing direct power supply cycling while maintaining protective functionality.
3Speed
If the fault detection signal directly follows the electrostatic detection signal transitions, then the power management unit can quickly respond to ESD, but the screen exhibits flashing and blurry effects during repeated ESD interference
Solution Approach 1:
The patent extracts the harmful transitional behavior from the fault detection signal by using a clamping module. Instead of allowing the fault detection signal to directly follow all transitions of the electrostatic detection signal, the clamping module extracts only the essential protective function while eliminating the harmful repeated transitions. The module takes out the unstable signal variations that cause flickering and blurring, retaining only the necessary ESD protection response.
Data Source
AI summary
An electrostatic protection circuit, a power management chip, and a display terminal are provided. The electrostatic protection circuit includes a level shift unit and a power management unit. The electrostatic protection circuit also includes a clamping module. An input terminal of the clamping module receives an electrostatic detection signal. An output terminal of the clamp module outputs a fault detection signal. The output terminal of the clamp module continues to output a high electrical potential when the electrostatic detection signal transits from a low electrical potential to the high electrical potential until the power management unit stops operating.