Inorganic Buffer Layer for Flexible Liquid Crystal Devices
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Solution Overview
Problem
Current flexible liquid crystal display devices face issues due to stress mismatch between polymer substrates and glass carriers, leading to distortion and hindering subsequent processes, and are prone to moisture ingress.
Innovation Solution
Incorporating an inorganic buffer layer, such as silicon nitride or silicon oxide, between the polymer substrate and the glass carrier to act as a stress layer and reduce moisture entry, facilitating a flatter glass carrier and improving processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible liquid crystal display device uses a polymer substrate and glass carrier, then the device achieves flexibility and basic structural integrity, but stress mismatch between the polymer substrate and glass carrier causes distortion and hinders subsequent processes
Solution Approach 1:
The patent introduces a buffer layer as an intermediary component between the polymer substrate and glass carrier. This buffer layer mediates the stress mismatch between the two materials, preventing distortion while maintaining flexibility. The buffer layer absorbs and distributes the differential stress, enabling subsequent manufacturing processes to proceed without distortion-related failures.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers with different material properties: a polymer substrate layer, a buffer layer, and a glass carrier layer. Each layer is selected for its specific mechanical properties, and their combination creates a composite structure that achieves both flexibility and dimensional stability, resolving the contradiction between adaptability and manufacturing precision.
2Adaptability or versatility
If a flexible liquid crystal display device uses a polymer substrate, then the device achieves flexibility and lightness, but the device becomes prone to moisture ingress
Solution Approach 1:
The buffer layer serves as an intermediary barrier between the moisture-prone polymer substrate and the liquid crystal device components. It provides a protective interface that reduces moisture ingress while preserving the flexible nature of the polymer substrate, thus protecting the device without compromising flexibility.
Solution Approach 2:
The patent utilizes thin film structures, particularly the buffer layer, to provide moisture protection while maintaining flexibility. These thin films create a protective barrier against moisture ingress without adding significant rigidity, allowing the device to remain flexible and bendable while achieving improved moisture resistance.
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 inorganic buffer layer reduces stress-induced distortion and enhances moisture blocking, resulting in improved product quality and reliability of flexible liquid crystal devices by ensuring a flatter glass carrier and better moisture resistance.
Implementation Method 1
the distortion of the glass carrier may have adverse influence on the subsequent processes after the polymer substrate is coated and baked because the stress of the polymer substrate and that of the glass carrier is not the same
Implementation Method 2
the inorganic buffer layer may be used to reduce the entry of moist to achieve the improvement the flexible liquid crystal device
Data Source
AI summary
A liquid crystal device comprises a first polymer substrate, a first buffer layer, thin film transistors, a liquid crystal layer and a second polymer substrate. The first buffer layer is disposed on the first polymer substrate. The thin film transistors are disposed on the first buffer layer. The liquid crystal layer is disposed on the thin film transistors. The second polymer substrate is disposed on the liquid crystal layer.