Shift Register Stabilization Circuit for Display GOA
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Solution Overview
Problem
The GOA circuit in display apparatuses experiences operation failures due to voltage fluctuations caused by parasitic capacitance, leading to ripple effects in input signals, which destabilize the circuit operation.
Innovation Solution
A shift register circuit with a stabilization circuit that includes transistors and a bootstrap capacitor to suppress potential drops at internal nodes, specifically designed to manage reset signals during charging periods, ensuring stable operation by fixing the reset signal to a reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the capacitance of the internal node is reduced to achieve high-speed driving, then the driving speed is improved, but the voltage fluctuation caused by parasitic capacitance becomes relatively large, leading to operation failure
Solution Approach 1:
The bootstrap capacitor is pre-charged to a predetermined voltage before the switching operation. This preliminary charging ensures that when the switching element turns on, the internal node already has sufficient voltage headroom, preventing voltage drops caused by parasitic capacitance effects during high-speed operation.
Solution Approach 2:
The bootstrap capacitor serves as a cushioning element that stores energy in advance. When voltage fluctuations occur due to parasitic capacitance during switching, this pre-stored energy compensates for the voltage drops, cushioning the impact on the internal node voltage and maintaining stable operation.
2Ease of manufacture
If the GOA circuit is designed with simple structure to reduce manufacturing complexity, then the ease of manufacture is improved, but voltage drops at internal nodes occur due to ripple of input signals
Solution Approach 1:
The bootstrap capacitor acts as an intermediary element between the power supply and the internal node. It mediates the voltage fluctuations by providing a stable voltage reference and filtering out ripples from input signals, thereby stabilizing the internal node voltage without requiring complex circuit structures.
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 proposed solution significantly improves the operational stability of the GOA circuit by reducing voltage drops and ripple effects, thereby enhancing the reliability and performance of the display apparatus.
Implementation Method 1
a bootstrap capacitor one end of which is electrically connected to the internal node and the other end of which is electrically connected to the first output terminal
Data Source
AI summary
A circuit includes a first transistor whose gate is connected to a set terminal and whose source or drain is connected to an internal node, a second transistor connected such that one of a source and a drain is electrically connected to the internal node and the other one of the source and the drain is electrically connected to a reference voltage source, a third transistor connected such that a gate is connected to the internal node, one of a source and a drain is connected to a clock terminal, and the other one of the source and the drain is connected to a first output terminal, a bootstrap capacitor which is connected to the internal node and the first output terminal, and a stabilization circuit that suppresses a drop in potential at the internal node in a charging period of the bootstrap capacitor.