Overcurrent Protection Circuit for Display Panel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current overcurrent protection circuits in display devices fail to detect excessively large currents generated by low-order voltage and scanning clock signals, leading to potential panel burns due to inadequate protection mechanisms.
Innovation Solution
An overcurrent protection circuit comprising a voltage generation circuit, current detection circuit, and microcontroller, which calculates and sets a protection value based on total and specific current values to control the output of scanning clock signals, preventing excessive current flow through a level shifter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate overcurrent protection is implemented for low-order voltage output and scanning clock signal output, then individual current protection is achieved, but the total current exceeding protection is not provided causing panel burn risk
Solution Approach 1:
The patent combines separate current detection circuits for low-order voltage output and scanning clock signal output into a unified protection system. The first current detection circuit detects current for low-order voltage, the second detects current for scanning clock signals, and both feed into a central processing unit that calculates total current. This merging approach provides comprehensive protection against total current exceeding while maintaining individual current monitoring capabilities.
Solution Approach 2:
The processing unit serves multiple functions: it processes current values from the first current detection circuit, processes current values from the second current detection circuit, calculates the total current value by summing both, determines whether total current exceeds the threshold, and controls the level shifter. This multi-functionality reduces the need for separate dedicated circuits for each function.
2Reliability
If total current monitoring is added to existing separate current protection circuits, then comprehensive overcurrent protection is achieved, but the device complexity increases
Solution Approach 1:
The processing unit is designed as a multi-functional component that handles current value reception from two different detection circuits, performs addition calculation to determine total current, compares the total against a threshold, and outputs control signals. By making this single unit perform all these functions, the patent avoids the complexity of adding separate dedicated circuits for each function.
Solution Approach 2:
The patent merges the functions of multiple current protection mechanisms into a unified system where the processing unit coordinates both individual current detections and total current monitoring. This consolidation provides comprehensive protection while minimizing the number of independent circuit blocks required.
3Measurement precision
If current detection sensitivity is increased to detect all excessive current conditions, then protection accuracy is improved, but false triggering of protection mechanisms increases
Solution Approach 1:
The protection system dynamically adjusts its detection and response based on the type of current being monitored. The first current detection circuit and second current detection circuit operate with their respective thresholds, and the processing unit dynamically calculates the total current and compares it against a total current threshold. This dynamic, multi-level detection approach allows the system to respond appropriately to different current conditions without false triggering.
Solution Approach 2:
The patent employs different current thresholds for different detection circuits and for the total current monitoring. By changing the parameter thresholds according to the specific current being monitored and the overall system context, the system achieves high detection precision while avoiding false protection triggering. The processing unit adjusts its evaluation criteria based on the combined input from multiple detection circuits.
Data Source
AI summary
An overcurrent protection circuit, an overcurrent protection method, and a display device are disclosed. The overcurrent protection circuit includes: a voltage generation circuit, a current detection circuit, and a microcontroller. An input end of the voltage generation circuit is connected to a power supply, an output end of the voltage generation circuit is connected to an input end of the current detection circuit, and a first output end of the current detection circuit is connected to a first input end of the microcontroller. The voltage generation circuit generates a low-order voltage, and transmits the low-order voltage to the current detection circuit. The current detection circuit generates a first current value based on the low-order voltage and transmits the first current value to the microcontroller. The microcontroller outputs a set overcurrent protection value based on a total current value of the overcurrent protection circuit and the first current value.