Driving Circuit Protection Against ESD Damage in Display Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During Electro-static discharge (ESD) tests, the high current in the starting circuit can damage the driving chip, leading to a risk of the chip catching fire and burning during the restarting process.
Innovation Solution
A driving circuit with a protection circuit and a starting circuit, where a control element, control unit, voltage comparison module, and transmission circuit work together to compare the starting voltage with the output voltage, generating a control signal to disconnect the control element from the starting circuit if the starting voltage exceeds a safe threshold, thereby preventing excessive voltage from damaging the driving chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the starting circuit provides high current for ESD testing, then the testing capability is improved, but the driving chip may be damaged
Solution Approach 1:
The patent introduces a protection circuit as an intermediary between the starting circuit and the driving chip. This protection circuit includes a control element (such as a MOS transistor) that acts as a mediator to limit and control the current flow during ESD testing, preventing direct exposure of the driving chip to excessive current while still allowing the ESD test to be performed on the display panel.
Solution Approach 2:
The protection circuit is activated before the ESD test begins, establishing current limiting protection in advance. The control element is configured to automatically limit the current when certain conditions are met, ensuring that the driving chip is protected from the outset during the high-current ESD testing process.
2Productivity
If the starting voltage is increased to restart the display panel, then the restarting capability is improved, but the driving chip may catch fire and burn due to excessive current
Solution Approach 1:
The control element in the protection circuit serves as a mediator during the restarting process. When the starting voltage is increased to restart the display panel, the control element automatically regulates the current flow, preventing excessive current from reaching the driving chip even though the voltage is high, thus eliminating the fire hazard while maintaining restarting capability.
Solution Approach 2:
The protection circuit incorporates a feedback mechanism where the control element monitors the current conditions and automatically adjusts its resistance or conductivity accordingly. When high voltage is applied during restarting, the feedback mechanism ensures the current is limited to safe levels, preventing the driving chip from overheating or catching fire.
Data Source
AI summary
A driving circuit, a driving method, and a display terminal are disclosed. A first output voltage is compared with a first starting voltage in a starting circuit in a first starting stage. If the first starting voltage is greater than the first output voltage, indicating that there is a risk of damaging a driving chip, a control unit turns off a control element to lower the first starting voltage in the starting circuit, to prevent the starting circuit outputting an excessively large voltage from damaging the driving chip in the first starting stage, so that the driving chip is protected.