Overvoltage Protection Circuit With Event Counting for Display Panels
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Solution Overview
Problem
Existing display panels face inefficiencies due to unnecessary overvoltage protection, which affects their usage when they are either protected for low overvoltage ranges or can withstand certain overvoltage instances, leading to reduced efficiency.
Innovation Solution
An overvoltage protection circuit with an overvoltage detection circuit and an overvoltage count circuit is implemented, connected between the power supply and the power management integrated circuit, which detects overvoltage states and outputs a cutoff signal to disconnect the power supply after preset overvoltage occurrences, thereby preventing damage and optimizing protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous overvoltage protection is implemented for the display panel, then the power management integrated circuit is protected from damage, but the use efficiency of the display panel is greatly affected
Solution Approach 1:
The protection mechanism transitions from static continuous protection to dynamic conditional protection. The system dynamically adjusts its protection state based on real-time monitoring of overvoltage occurrence frequency, switching between protection mode and normal operation mode according to whether the threshold is exceeded.
Solution Approach 2:
The system changes the protection parameter from binary (protected/not protected) to threshold-based (below threshold/above threshold). By introducing a frequency threshold parameter, the system allows operation in non-protection state when overvoltage frequency remains below the threshold, and activates protection only when the threshold is exceeded.
2Reliability
If overvoltage protection is activated for low overvoltage ranges, then the power management integrated circuit is protected, but unnecessary protection occurs reducing operational efficiency
Solution Approach 1:
The system implements feedback control by continuously monitoring the frequency of overvoltage occurrences and comparing it against the preset threshold. This feedback mechanism enables the system to make informed decisions about whether to activate protection, avoiding unnecessary protection actions when overvoltage frequency is within acceptable ranges.
Solution Approach 2:
The system performs preliminary assessment of overvoltage frequency before activating protection. By counting and evaluating the frequency of overvoltage events in advance, the system determines whether the threshold is exceeded, and only then activates protection, preventing premature or unnecessary protection actions.
3Adaptability or versatility
If the display panel can withstand certain overvoltage times, then operational flexibility is maintained, but continuous protection stops power supply affecting efficiency
Solution Approach 1:
The system applies partial protection action by allowing a certain number of overvoltage occurrences (below threshold) without activation of protection. This partial action approach enables the system to tolerate minor overvoltage events while reserving full protection capability for more severe cases, optimizing the balance between adaptability and efficiency.
Data Source
AI summary
Disclosed are an overvoltage protection circuit, a display panel and a display. The overvoltage protection circuit includes an overvoltage detection circuit and an overvoltage count circuit. The overvoltage detection circuit connected to a power supply and the overvoltage count circuit detects a power supply voltage output by the power supply and output an overvoltage signal to the overvoltage count circuit when the power supply voltage is in an overvoltage state. The overvoltage count circuit connected to a switching element outputs a cutoff signal to the switching element when accumulated times for receiving overvoltage signals reach preset times, to control the switching element to disconnect the power supply from the power management integrated circuit.