Driver Circuit Shutdown via Node Voltage Detection for Overcurrent Protection
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Solution Overview
Problem
Existing driver circuits for display panels or backlight panels lack a current detection function, leading to potential overheating and damage due to excessive currents in case of short-circuits or component failures.
Innovation Solution
Incorporating a detection and protection circuit within the driver circuit that can detect voltage changes at a first node connected to the electronic unit and control the driver unit to turn off when excessive current is detected, thereby protecting the electronic unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driver circuits are used to drive display panels or backlight panels without current detection function, then the device can operate and drive electronic units, but when short-circuits or damage occur, excessive current cannot be detected and protected, leading to overheating and burning risks
Solution Approach 1:
The patent merges the detection function into the existing driver circuit by integrating a detection circuit that monitors the voltage at the first node. This combination allows the driver circuit to simultaneously perform driving and protection functions without adding completely separate detection equipment, thus improving reliability while controlling device complexity.
Solution Approach 2:
The patent introduces a detection circuit as an intermediary component that monitors the voltage at the first node between the power supply and the electronic unit. This intermediary detects voltage changes caused by excessive current and triggers protection mechanisms, enabling indirect current detection through voltage monitoring without directly measuring current.
2Object-affected harmful factors
If no detection function is included in the driver circuit, then the circuit structure remains simple, but when electronic units are short-circuited or damaged, the current rises sharply causing power consumption increase and overheating risk
Solution Approach 1:
The patent implements preliminary protection action by continuously monitoring the voltage at the first node before excessive current can cause damage. The detection circuit is ready to detect voltage drops indicating short-circuit conditions and immediately triggers the protection mechanism to cut off power supply, preventing harmful effects before they occur.
Solution Approach 2:
The patent establishes a feedback mechanism where the detection circuit continuously monitors the voltage at the first node and feeds this information back to control the power supply. When the voltage indicates abnormal conditions (excessive current), the feedback loop automatically adjusts the power supply to reduce or cut off current, thereby protecting the electronic unit.
Data Source
AI summary
The disclosure provides an electronic device including a driver circuit and a driving method thereof. The driver circuit includes an electronic unit, a driver unit, and a detection and protection circuit. The driver unit is electrically connected to the electronic unit. The detection and protection circuit is electrically connected to the electronic unit through a first node, and is electrically connected to a gate terminal of the driver unit through a second node. When a voltage of the first node is pulled down, the detection and protection circuit controls the driver unit to be turned off. The detection and protection circuit of the driver circuit of the disclosure protects the electronic unit from excessive current.