GOA Circuit Bootstrap Module for Scan Signal Voltage
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Solution Overview
Problem
Existing gate driver on array (GOA) circuits fail to achieve high enough voltage potentials for scan signals due to limitations in bootstrap performance.
Innovation Solution
A GOA circuit with cascaded units, including a pull-up control module, pull-up module, bootstrap module, control module, pull-down module, and pull-down holding module, which utilize clock signals and switch transistors to enhance the voltage potential of scan signals through a series of controlled voltage transitions and delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only a capacitor is adopted for bootstrapping the pull-up control signal, then the circuit structure is simple, but the voltage potential of the outputted scan signal is not high enough
Solution Approach 1:
The invention divides the single bootstrapping function into two separate modules: a bootstrap module that bootstraps the pull-up control signal, and a control module that bootstraps the scan signal. This segmentation allows each module to specialize in bootstrapping its respective signal, ensuring both signals achieve sufficient voltage potential while maintaining clear functional separation.
Solution Approach 2:
The control module acts as an intermediary between the bootstrap module and the scan signal output. It receives the bootstrapped pull-up control signal, processes it through additional bootstrapping, and then drives the scan signal. This intermediary structure enables dual-stage voltage enhancement, solving the voltage insufficiency problem.
2Reliability
If a dual-module bootstrapping structure is implemented, then the voltage potential of scan signal is sufficiently high, but the device complexity increases
Solution Approach 1:
The invention merges the bootstrapping functions for both the pull-up control signal and the scan signal into a single integrated circuit structure. The bootstrap module and control module work together in a unified architecture, sharing common elements and operating in coordination, which reduces overall system complexity compared to separate independent modules.
Solution Approach 2:
The control module serves multiple functions: it receives the bootstrapped pull-up control signal, performs additional bootstrapping on the scan signal, and drives the output. This multi-functionality reduces the need for separate dedicated modules, thereby managing circuit complexity while achieving sufficient voltage potential.
3Speed
If the control module operates immediately without delay, then the response speed is fast, but the voltage potential stabilization is insufficient
Solution Approach 1:
The capacitor in the control module performs preliminary action by pre-charging or pre-discharging to prepare the voltage potential before the main switching action occurs. This preliminary voltage preparation ensures that when the control module switches, the voltage potential is already stabilized, preventing instability during the transition while maintaining fast response.
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
This configuration improves the stability and efficiency of scan signal voltage potential, ensuring the voltage is adequately pulled up and subsequently pulled down, enhancing the overall performance of the GOA circuit.
Implementation Method 1
The control module comprises a capacitor and a first switch transistor. The control module is further configured to turn on the first switch transistor after the delayed first predetermined duration affected by the capacitor
Implementation Method 2
The bootstrap module comprises a bootstrap capacitor. One end of the bootstrap capacitor receives the pull-up control signal and another end of the bootstrap capacitor receives the scan signal of the present stage.
Data Source
AI summary
The present disclosure provides a gate driver on array (GOA) circuit and a thin-film transistor substrate. The GOA circuit includes a plurality of cascaded GOA units. Each stage of the GOA units includes: a pull-up control module, a pull-up module, a bootstrap module for raising a voltage potential of a pull-up control signal, a control module for transmitting the raised voltage potential of the pull-up control signal to a scan signal of a present stage to raise the voltage potential of the scan signal of the present stage, a pull-down module, and a pull-down holding module.