GOA Circuit TFT Reduction via Inverter Optimization

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Solution Overview

Problem

Conventional GOA circuits require a large number of thin film transistors (TFTs), which are not economically economical and occupy significant layout space, limiting the potential for narrow frame designs in liquid crystal display devices.

Innovation Solution

The proposed GOA circuit design reduces the number of TFTs by optimizing the inverter structure, specifically by removing T63 and connecting the gate of T64 to ST(N), allowing for a more efficient pull-down operation without affecting the gate signal output, thereby reducing the overall number of TFTs and layout space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional GOA circuit structure is used, then the circuit can maintain stable gate signal output, but the number of TFTs is large and layout space is occupied

Engineering Contradiction:

Improvegate signal output stabilityVSAvoidlayout space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent extracts and removes the redundant T63 transistor from the conventional GOA circuit structure. By taking out this unnecessary component, the circuit maintains its gate signal output stability while reducing the total number of TFTs and freeing up layout space for narrow frame design.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the functions of T64 with the stage-transfer signal connection by directly connecting T64's gate to ST(N). This consolidation eliminates the need for T63 while maintaining the pull-down sustain unit's functionality, thereby reducing TFT count without compromising circuit reliability.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If conventional GOA circuit structure is used, then the circuit can achieve pull-down sustain function, but the number of TFTs is not economical

Engineering Contradiction:

Improvepull-down sustain functionVSAvoidTFT quantity economy

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent extracts the redundant T63 transistor from the pull-down sustain unit. By removing this unnecessary component and directly connecting T64's gate to the stage-transfer signal, the circuit maintains its pull-down sustain function while reducing TFT quantity for more economical manufacturing.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent makes T64 serve multiple functions by connecting its gate directly to ST(N). T64 now handles both the pull-down sustain function and the stage-transfer signal response, eliminating the need for a separate T63 transistor and improving manufacturing economy.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10386663B2GOA circuit and liquid crystal display device

Publication Date: 2019.08.20 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A GOA circuit includes a plurality of cascaded GOA units. An N-th stage GOA unit controls charging of an N-th horizontal scanning line. The N-th stage GOA unit includes a pull-high control unit, a pull-high unit, a pull-down unit, a pull-down sustain unit, and a boast capacitor (Cb). The pull-high unit, the pull-down sustain unit and the boast capacitor (Cb) are connected with a first node (Q(N)) and a gate signal output terminal (G(N)) of the N-th stage GOA unit. The pull-high control unit and the pull-down unit are connected with the first node (Q(N)) of the N-th stage GOA unit. The pull-down sustain unit includes a first TFT (T61), a second TFT (T62), a third TFT (T64), a fourth TFT (T43), and a fifth TFT (T33). Also provided is a liquid crystal display device using the GOA circuit.