Glass Substrate Display Device Crease Reduction
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Solution Overview
Problem
Existing display devices face issues with low flatness and creases at the bending center, particularly in folding mobile phone applications, due to material thinning and increased bending demands.
Innovation Solution
The proposed display device incorporates a first glass with high yield strength between the cover plate and polarizer, and a second glass with inorganic mineral composition, along with a buffer layer, thin film transistor layer, light-emitting layer, encapsulation layer, and touch sensor layer, to enhance flatness and water/oxygen blocking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the display device uses thin materials to achieve thinning, then the thickness is reduced, but the surface flatness deteriorates and creases are generated at the bending center
Solution Approach 1:
The patent changes the material parameters by using glass substrates with specific thickness ranges (first glass: 50-150 μm, second glass: 50-150 μm) and specific material compositions (including inorganic minerals like SiO2, Na2SiO3, CaSiO3, and Na2O·CaO·6SiO2). This parameter optimization allows the display device to achieve thinning while maintaining sufficient rigidity to prevent surface flatness degradation and crease formation during bending operations.
Solution Approach 2:
The patent employs composite material structures by combining multiple functional layers including the first glass substrate, buffer layer, thin film transistor layer, light-emitting layer, encapsulation layer, and second glass substrate. This composite structure distributes mechanical stress across multiple layers, enabling the device to maintain surface flatness and resist crease formation even when individual layers are thin, thus solving the contradiction between thinning and flatness maintenance.
2Length of moving object
If the display device uses thin materials to achieve thinning, then the thickness is reduced, but the bending reliability deteriorates
Solution Approach 1:
The patent optimizes material parameters by selecting glass substrates with specific thickness ranges (50-150 μm) and material compositions containing inorganic minerals. These parameter changes ensure that the substrates have sufficient mechanical strength and flexibility balance, allowing the display device to withstand repeated bending cycles without failure, thus improving bending reliability while maintaining thin profile.
Solution Approach 2:
The patent incorporates buffer layers and encapsulation layers between the glass substrates and other components. These protective layers serve as cushioning elements that absorb and distribute mechanical stress during bending operations, preventing stress concentration that could lead to substrate failure. This beforehand cushioning approach enhances bending reliability without significantly increasing overall device thickness.
3Shape
If the display device uses glass with high yield strength, then the flatness and rigidity are improved, but the device complexity increases
Solution Approach 1:
The patent designs the first and second glass substrates to serve multiple functions simultaneously: they provide structural support and flatness, act as barriers against environmental factors, serve as mounting surfaces for other components, and contribute to the overall aesthetic appearance. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity despite using high-performance glass materials.
Solution Approach 2:
The patent uses composite material structures where the glass substrates are combined with various functional layers (buffer layer, thin film transistor layer, light-emitting layer, encapsulation layer). This composite approach allows each layer to contribute specific properties, enabling the glass substrates to maintain flatness and rigidity while the overall structure remains integrated and manageable in 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 solution effectively improves the flatness and rigidity of the display device, reducing creases and enhancing water and oxygen blocking capabilities, thereby addressing the challenges of material thinning and bending reliability.
Implementation Method 1
the high yield strength characteristic of the first glass is used to effectively improve the problem of bending creases caused by bending multiple times
Implementation Method 2
the second glass is used instead of the PI substrate in the prior art to further improve the flatness of the display device
Implementation Method 3
the second glass is used instead of the PI substrate in the prior art to further improve the flatness of the display device... enhancing water and oxygen blocking performance
Data Source
AI summary
The present invention relates to a display device. On the one hand, a first glass is provided between the cover plate and the polarizer, and the high yield strength characteristic of the first glass is used to effectively improve the problem of bending creases caused by bending multiple times, wherein the rigidity of the first glass is used to improve the flatness of the display device. On the other hand, the second glass is used instead of the PI substrate in the prior art to further improve the flatness of the display device.