GOA Unit Pull-Down Circuit Prevents Crosstalk
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Solution Overview
Problem
Current gate driver circuits using Gate-on-Array (GOA) technology suffer from signal crosstalk, leading to incorrect switching-on of pixels, resulting in abnormal images due to the flooding state of GOA units.
Innovation Solution
Incorporating a pull-down circuit connected to a low-voltage end that inputs a low-voltage signal into the driver circuit to maintain an off state when the GOA unit outputs an off signal, preventing incorrect switching-on and ensuring accurate pixel control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If GOA technology is adopted to achieve light and thin display devices, then device thickness and weight are reduced, but signal crosstalk occurs causing incorrect pixel switching
Solution Approach 1:
The patent applies preliminary anti-action by introducing a pull-down circuit that proactively pulls the control end voltage to low level before signal crosstalk can cause incorrect switching. This preventive mechanism counteracts the potential harmful effect of coupled-in signals by establishing a predetermined low-voltage state that resists erroneous activation.
Solution Approach 2:
The pull-down circuit serves as an intermediary element between the driver circuit and the signal crosstalk interference. It mediates the voltage at the control end by providing a controlled low-voltage path, thereby isolating the driver circuit from the harmful effects of coupled-in signals and ensuring reliable off-state maintenance.
2Productivity
If GOA unit outputs off signal in flooding state, then pixel row is driven to switch on, but signal crosstalk causes incorrect switching-on due to coupled-in signals
Solution Approach 1:
The pull-down circuit implements preliminary anti-action by pre-establishing a low-voltage path at the control end that prevents coupled-in signals from causing incorrect switching. This proactive measure counteracts signal crosstalk before it can interfere with the pixel switching process, ensuring accurate signal transmission during high-speed operation.
Solution Approach 2:
The pull-down circuit provides negative feedback by continuously maintaining the control end at low level when the GOA unit should be off. This feedback mechanism monitors and corrects voltage deviations caused by signal crosstalk, ensuring that the driver circuit remains in the correct off state despite external interference.
3Device complexity
If driver circuit control end voltage is not controlled, then circuit structure is simple, but coupled-in signals cause driver circuit to switch on incorrectly
Solution Approach 1:
The pull-down circuit acts as an intermediary component that introduces minimal complexity while solving the reliability issue. It provides a controlled low-voltage path that prevents coupled-in signals from causing incorrect switching, thereby improving driver circuit reliability with a relatively simple additional structure.
Solution Approach 2:
The invention changes the voltage parameter at the control end by introducing a pull-down mechanism that actively maintains low voltage level. This parameter change ensures that the control end remains at the correct voltage level to prevent incorrect switching, trading a small increase in circuit complexity for significant improvement in switching accuracy.
Data Source
AI summary
A gate on array (GOA) unit, a gate driver circuit, and a display device are provided. The GOA unit includes a driver circuit, a pull-down circuit, and a pull-down control circuit, the driver circuit is configured to output a first signal from an output end of the GOA unit. The pull-down circuit is connected with the driver circuit and at least one voltage end that provides a voltage signal, the pull-down circuit is configured to input the voltage signal into a control end of the driver circuit to drive the driver circuit to be in an off state when the GOA unit outputs an off signal. The pull-down control circuit is connected with the pull-down circuit and the driver circuit, and is configured to control the pull-down circuit to input the voltage signal to the control end of the driver circuit.