GOA Driving Circuit Pull-Down Holding Module Simplification

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Solution Overview

Problem

Existing GOA driving circuits require significant space for wire arrangement due to the number of thin-film transistors in pull-down holding modules, which hinders the development of narrow-bezel and thin LCD panels.

Innovation Solution

A cascaded GOA driving circuit structure with reduced thin-film transistors in the pull-down holding module, utilizing a simplified configuration of thin-film transistors and clock signals to minimize wire arrangement space, including a pull-up control module, pull-up module, pull-down module, and pull-down holding module, with specific connections and clock signal phases to achieve efficient signal control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional GOA driving circuit structure with multiple pull-down holding modules is used, then the circuit can properly hold signals, but the area occupied by wire arrangement increases

Engineering Contradiction:

Improvesignal holding capabilityVSAvoidwire arrangement space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent combines the functions of multiple pull-down holding modules into a single integrated module. The first and second pull-down holding modules are merged to share common components (thin-film transistors T32, T42, T33, T43) and control signals, reducing the total number of transistors from 12 to fewer components while maintaining the signal holding capability for both Qn and Gn nodes.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The merged pull-down holding module serves multiple functions: it holds both the Qn signal (via transistors T32, T42) and the Gn signal (via transistors T33, T43), and is controlled by unified control signals LC1 and LC2. This multi-functional design reduces component count and wire arrangement space while maintaining proper signal holding for different GOA unit stages.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10388202B2GOA driving circuit

Publication Date: 2019.08.20 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

Disclosed is a GOA driving circuit including multistage cascaded GOA units. A current-stage GOA unit includes a pull-up control module, a pull-up module, a pull-down module, and a pull-down holding module. The pull-down holding module is configured to hold the pull-up control signal and the line-scanning signal of the current-stage GOA unit at a low level according to a second clock signal, during a scan cycle of pixel units not in a current line. The GOA driving circuit simplifies a structure of a GOA driving circuit and is conducive to a narrow-bezel design.