Thin-Film Transistor Substrate Stress Protection
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Solution Overview
Problem
The decreasing thickness of display devices increases the likelihood of damage to thin-film transistors due to external impacts, particularly when flexible display devices are deformed, leading to increased stress on these components.
Innovation Solution
Incorporating protection members with higher elastic moduli than the surrounding layers on and/or under the transistors, including metal and inorganic insulating materials, to distribute and reduce stress applied to the transistors during deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the display device is decreased, then the flexibility and modern design requirements are met, but the thin-film transistor becomes more vulnerable to damage from external impacts and stress during deformation
Solution Approach 1:
The patent applies beforehand cushioning by introducing protection members (first and second protection members) positioned on opposite sides of the thin-film transistor before any impact occurs. These protection members have higher elastic moduli than the surrounding layers, creating a pre-positioned stress-distributing structure that cushions the transistor against future external impacts and deformation stresses, thereby resolving the vulnerability caused by reduced device thickness
Solution Approach 2:
The patent employs composite materials by combining the thin-film transistor with protection members made of different materials having higher elastic moduli. This composite structure integrates the flexible substrate with rigid protection members to create a hybrid system that maintains overall flexibility while providing localized stress protection to the vulnerable transistor components
2Strength
If protection members with higher elastic moduli are added to protect the transistor, then stress resistance is improved, but the structural complexity and number of layers increase
Solution Approach 1:
The patent applies local quality by positioning protection members specifically at locations where stress concentration occurs during device deformation, rather than uniformly protecting the entire device. The first protection member is placed on one side of the transistor and the second protection member on the other side, creating localized reinforcement zones that provide maximum stress resistance with minimum additional structural complexity
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 use of protection members effectively reduces stress on the transistors, enhancing their durability and the overall flexibility of the display device without compromising electrical signals.
Implementation Method 1
Incorporating protection members with higher elastic moduli than the surrounding layers on and/or under the transistors, including metal and inorganic insulating materials, to distribute and reduce stress applied to the transistors during deformation
Data Source
AI summary
A thin-film transistor substrate may include a substrate, a transistor on the substrate, and including an active pattern, and a gate electrode insulated from the active pattern, and a first protection member on the transistor, and overlapping the transistor in a plan view.