GOA Overcurrent Protection Circuit for Display Panel
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Solution Overview
Problem
Conventional gate on array (GOA) circuits lack effective overcurrent protection, risking damage to display panels due to short circuits or abnormal currents, which complicates detection and increases production costs.
Innovation Solution
An overcurrent protection circuit comprising a load circuit, amplifying circuit, comparator, controller, and switch that converts and amplifies voltage signals into current signals, comparing the product with a threshold voltage to control a switch for overcurrent protection, with distinct configurations for 2D and 3D modes to enhance protection efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GOA circuit is used to substitute external driving chip, then manufacturing process is simplified and production costs are reduced, but the circuit lacks effective overcurrent protection capability
Solution Approach 1:
The protection circuit is divided into distinct functional modules: amplifying circuit for signal amplification, comparator for voltage comparison, controller for logic control, and switch for circuit isolation. This segmentation allows each module to perform its specific function efficiently while maintaining overall system reliability without complicating the manufacturing process.
Solution Approach 2:
The protection circuit performs preliminary detection by continuously monitoring the gate line current through the amplifying circuit and comparator before overcurrent damage occurs. The controller activates the switch to isolate the fault in advance, preventing panel damage and ensuring reliable operation.
2Reliability
If protective circuits are added to CKV for overcurrent protection, then panel damage is prevented, but device complexity increases
Solution Approach 1:
The protection circuit is integrated into the GOA circuit structure, sharing power supply terminals and signal lines with the existing circuit. The amplifying circuit, comparator, controller, and switch are combined into a unified protection system that monitors and protects the gate line without requiring separate independent protection circuits, thereby reducing overall device complexity.
Solution Approach 2:
The protection circuit serves multiple functions: current detection through the amplifying circuit, voltage comparison against thresholds, logical control of protection actions, and circuit isolation via the switch. This multi-functionality allows a single integrated circuit to provide comprehensive overcurrent protection without increasing device complexity.
3Measurement precision
If voltage signals are converted and amplified into current signals for detection, then measurement precision is enhanced, but device complexity increases
Solution Approach 1:
The amplifying circuit acts as an intermediary between the gate line current and the comparator. It converts the current signal into an amplified voltage signal that can be easily compared against reference voltages. This intermediary conversion enhances measurement precision by providing sufficient signal amplitude for accurate comparison while using standard electronic components.
Solution Approach 2:
The circuit uses electrical signal conversion and amplification instead of mechanical measurement methods. The amplifying circuit electronically amplifies the current signal through voltage conversion, and the comparator electronically compares the amplified signal against threshold voltages, replacing any potential mechanical or physical measurement systems with electronic signal processing for higher precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents panel damage from excessive currents, simplifies detection, enhances measurement precision, and reduces operational risks, while improving protection across different modes, thus ensuring the integrity and cost-effectiveness of display panels.
Implementation Method 1
The amplifying circuit includes an input terminal connecting to a high voltage supply terminal and an output terminal grounded through the load circuit. The high voltage supply terminal is fed with a high voltage signal from a control signal source of the GOA circuit, for amplifying the high voltage signal.
Implementation Method 2
The voltage value of the output terminal of the amplifying circuit is V=I*R, I is a current value of the amplified high voltage signal from the amplifying circuit, and R is a resistance of the load circuit.
Implementation Method 3
The comparator, connecting to the output terminal of the amplifying circuit, is configured to output a first high voltage level signal after comparing and ensuring that a voltage value of the output terminal of the amplifying circuit is larger than a voltage value of a threshold voltage.
Data Source
AI summary
An overcurrent protection circuit of a GOA circuit is provided. A voltage signal from a control signal source of the GOA circuit is converted into a current signal, and then the current signal is amplified. Subsequently, a product of the amplified current signal and a load resistor is compared with a threshold voltage. If the product is larger than the threshold voltage, a controller controls a switch to output a low voltage level signal to ensure that the GOA circuit is at an overcurrent protected state. In this way, the panel is prevented from being damaged due to overabundant currents. Besides, the comparison of the amplified current signal is good for decreasing detection difficulties, enhancing precision of a measurement, and lowering risk of operation mistakes. Moreover, 2D and 3D modes in overcurrent protection through different load circuits improve the effect of protection.