GOA Driver Circuit Bootstrap Capacitance Signal Transmission
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Solution Overview
Problem
Conventional gate driver on array (GOA) techniques are costly and have limited pulling up ability due to the need for a transferring module to conduct clock signals, which restricts the efficiency of the gate driving signal transmission in liquid crystal display (LCD) systems.
Innovation Solution
A gate driver on array (GOA) driving circuit with cascaded GOA units, including a pull-up module, pull-down module, pull-up controlling module, pull-down holding module, and bootstrap capacitance module, where the Nth stage GOA unit outputs a gate driving signal to an Nth scan line without using a transferring module, utilizing a gate signal node as a transferring signal and enhancing the turn-on voltage for improved pull-up ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transferring module is used to conduct clock signals between GOA units, then the clock signal can be transmitted between stages, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the transferring module from the GOA unit structure. Instead of using a dedicated transferring module to conduct clock signals between stages, the invention uses the gate signal node Q(N) itself to transfer the signal, thereby reducing device complexity while maintaining signal transmission reliability
Solution Approach 2:
The gate signal node Q(N) is given multiple functions: it serves as both the output node for the Nth stage and the input node for the (N+1)th stage. This multi-functionality eliminates the need for separate transferring modules, reducing overall device complexity while maintaining reliable signal transmission across stages
2Reliability
If a transferring module is used to conduct clock signals, then signal transmission is enabled, but the pulling up ability is limited
Solution Approach 1:
The patent changes the voltage parameters at the gate signal node Q(N) to enhance pulling up ability. By utilizing higher voltage levels and optimizing the voltage transfer characteristics, the system achieves stronger pulling up capability without requiring additional transferring modules, thus resolving the contradiction between transmission capability and power
3Reliability
If a transferring module is included in the GOA unit, then clock signal transmission is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the transferring module from the GOA unit structure, eliminating the associated manufacturing cost. The signal transmission function is achieved through the inherent gate signal node Q(N), which requires no additional components, thereby reducing manufacturing complexity and cost while maintaining reliable inter-stage signal transmission
Solution Approach 2:
The gate signal node Q(N) serves itself by functioning as both output and input across stages. This self-service approach eliminates the need for separate transferring modules, reducing component count and manufacturing cost while maintaining the necessary signal transmission capability
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 enhances the pull-up ability of the gate driving signal transmission, reducing costs and improving the efficiency of the liquid crystal display by eliminating the need for a transferring module and utilizing a bootstrap capacitance to support signal transmission across stages.
Implementation Method 1
a bootstrap capacitance module coupled to the Nth gate signal node and the Nth scan line
Data Source
AI summary
The present disclosure proposes a gate driver on array (GOA) driving circuit and a liquid crystal display. The GOA driving circuit includes cascaded GOA units. An Nth stage GOA unit outputs a gate driving signal to an Nth scan line on a display area. The Nth stage GOA unit includes a pull-up module, a pull-down module, a pull-up controlling module, a pull-down holding module, and a bootstrap capacitance module.