Porous TFT Active Layer Structure for Flexible Display Bending

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Solution Overview

Problem

Conventional thin film transistors in flexible display panels fail to meet the increasing requirements for bending performance, leading to potential damage and crack propagation under stress.

Innovation Solution

Incorporating open pores in the active layer of thin film transistors, which concentrate stress and prevent crack spreading when the flexible display panel is bent, enhancing the bending performance by reducing damage to the transistor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional thin film transistors are used in flexible display panels, then the device structure is simple and easy to manufacture, but the bending performance is poor and cracks propagate under stress

Engineering Contradiction:

Improvebending performanceVSAvoidtransistor structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies porous materials by introducing open pores into the active layer of the thin film transistor. These pores act as stress concentration points that prevent crack propagation during bending, thereby improving the reliability and bending performance of the flexible display panel without significantly complicating the overall device structure

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent implements local quality by creating localized open pores only in specific regions of the active layer where stress concentration occurs during bending. This localized modification enhances bending performance while maintaining the simplicity of the overall transistor structure, as only specific areas are modified rather than the entire device

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the active layer is made more flexible to improve bending performance, then the flexibility increases, but the crack resistance decreases

Engineering Contradiction:

ImproveflexibilityVSAvoidcrack resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent converts the harmful effect of stress concentration into a beneficial feature by deliberately introducing open pores that act as predetermined stress concentration points. These pores allow stress to concentrate in controlled locations, preventing uncontrolled crack propagation and thereby improving both flexibility and crack resistance simultaneously

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

The open pores effectively reduce bending-induced stress on the thin film transistor, preventing crack propagation and protecting the device, thereby improving the overall bending performance of flexible display panels.

Implementation Method 1

when a bending force is applied to the flexible display panel, stress on the thin film transistor is concentrated in the open pores

Methodology Applied

Scientific EffectStress concentration:

Data Source

PatentUS12193270B2Flexible display panel with open pores and flexible array substrate

Publication Date: 2025.01.07 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A flexible display panel and a flexible array substrate are provided. The flexible display panel includes a flexible base and a thin film transistor. The thin film transistor includes an active layer, and the active layer is arranged on the flexible base. Open pores are formed in the active layer. The open pores penetrate through at least one part of the active layer.