GOA Circuit Generating Negative Impulse Waveforms Using N-Type TFTs

Solution Overview

Problem

Current display technologies face challenges in generating negative impulse waveforms for internal feedback mechanisms in AMOLED display panels, particularly due to the rarity of p-type GOA circuits.

Innovation Solution

A GOA circuit comprising multiple GOA units connected in series, utilizing a pull-up module, pull-up holding module, converting module, pull-down holding module, and pull-down module, which can generate a negative impulse waveform using N-type TFTs, allowing for a normal circuit implementation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a p-type GOA circuit is used to generate negative impulse waveforms, then the internal feedback mechanism can be implemented, but the device complexity increases and manufacturing becomes difficult

Engineering Contradiction:

Improveinternal feedback mechanismVSAvoidp-type GOA circuit

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent inverts the conventional approach by using an n-type GOA circuit (commonly available) instead of a rare p-type GOA circuit to generate the negative impulse waveform. The inversion is achieved through circuit configuration where the n-type circuit produces the opposite polarity signal needed for feedback, thereby simplifying manufacturing while maintaining the feedback mechanism's reliability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the key parameter of transistor type from p-type to n-type in the GOA circuit. This parameter change allows the use of commonly manufactured n-type TFTs instead of rare p-type TFTs, reducing device complexity and manufacturing difficulty while still achieving the required negative impulse waveform generation through modified circuit operation

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a p-type GOA circuit is used to generate negative impulse waveforms, then the internal feedback mechanism can be implemented, but the ease of manufacture decreases

Engineering Contradiction:

Improveinternal feedback mechanismVSAvoidp-type GOA circuit

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent inverts the conventional approach by using an n-type GOA circuit (commonly available) instead of a rare p-type GOA circuit to generate the negative impulse waveform. The inversion is achieved through circuit configuration where the n-type circuit produces the opposite polarity signal needed for feedback, thereby simplifying manufacturing while maintaining the feedback mechanism's reliability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent replaces the expensive and difficult-to-manufacture p-type GOA circuit with a cheaper and easier-to-manufacture n-type GOA circuit. Although the circuit configuration is modified, the use of standard n-type TFTs (which are mass-produced and inexpensive) instead of rare p-type TFTs significantly improves ease of manufacture

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS11227535B2Gate on array unit, GOA circuit and display panel

Publication Date: 2022.01.18 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A GOA unit, a GOA circuit and a display panel are provided. The GOA unit includes a pull-up module, a pull-up holding module, a converting module, a pull-down holding module, and a pull-down module. Each module can be implemented with N-type TFTs. The GOA unit could generate a negative impulse waveform for internal feedback mechanism.