GOA Circuit Segmentation for Narrow Frame LCD Design

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Solution Overview

Problem

Conventional amorphous silicon GOA circuits for liquid crystal displays face challenges in achieving a narrow frame design due to their complex structure and increased size with more TFTs, which contradicts the trend of narrow frame development.

Innovation Solution

The implementation of a GOA circuit comprising multiple cascaded GOA units with specific connections and control modules, including a pull-up control module, transmission module, pull-down module, pull-down maintaining module, and bootstrap capacitor, reduces the number of TFTs and simplifies the circuit design, allowing for a narrower frame.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the number of TFTs in the GOA circuit is increased to improve driving capability, then the driving performance is improved, but the frame size increases which contradicts narrow frame design requirements

Engineering Contradiction:

Improvedriving capabilityVSAvoidframe size

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The GOA circuit is divided into multiple cascaded GOA units, where each unit handles a specific portion of the driving function. This segmentation allows the circuit to achieve sufficient driving capability through distributed operation rather than requiring a large number of TFTs in a single complex circuit, thereby reducing the overall frame size.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple functional modules (pull-up control module, pull-up module, transmission module, pull-down module, pull-down maintaining module) are merged into an integrated GOA unit structure. This consolidation achieves efficient driving performance while minimizing the number of discrete TFTs required, thus reducing frame size.

Inventive Principle:

Principle #5Merging (Combining)

2Manufacturing precision

If the GOA circuit structure is made complex to improve driving precision, then the control accuracy is improved, but the circuit size increases which contradicts narrow frame design

Engineering Contradiction:

Improvecontrol accuracyVSAvoidcircuit size

Core Design Contradiction:

Manufacturing precisionVSArea of stationary object

Solution Approach 1:

Each GOA unit is designed with specialized local modules that perform specific functions with high precision. The pull-up control module, transmission module, and pull-down maintaining module each handle specific control tasks locally, achieving overall high control accuracy without requiring a globally complex circuit structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The GOA circuit employs dynamic control through cascaded units that can be activated in sequence. The clock signal line and scanning line coordination enables dynamic operation where only necessary units are active at any given time, maintaining high control accuracy while reducing the effectively used circuit area.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10269318B2Liquid crystal display device and GOA circuit of the same

Publication Date: 2019.04.23 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A liquid crystal display device and a GOA circuit of the same are provided. The GOA circuit includes multiple cascaded GOA units, wherein an N-th stage GOA unit of the multiple cascaded GOA units comprises: a pull-up control module, a pull-up module, a transmission module, a pull-down module, a pull-down maintaining module and a bootstrap capacitor. The GOA circuit can ensure to finish a displaying and driving of liquid crystals, greatly simplify the circuit design, save the cost of the circuit, and reduce the size of the GOA circuit so that the liquid crystal display device can have a design space for a narrower frame.