Friction Reducing Layer for Liquid Crystal Display Polarizer
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Solution Overview
Problem
Liquid crystal display devices experience abnormal variations in liquid crystal arrangement and light luminance due to friction forces generated when the rough surface of the polarizer contacts external objects, degrading display quality, especially in Normally Black Mode.
Innovation Solution
A friction reducing layer with a small friction coefficient is applied to the outer surface of the polarizer, reducing the friction force caused by contact and stabilizing liquid crystal molecule alignment, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the polarizer surface is left rough, then the structure is simple and easy to manufacture, but friction force is generated when contacting external objects causing abnormal liquid crystal arrangement and light leakage
Solution Approach 1:
A friction reducing layer is introduced as an intermediary between the polarizer surface and external objects. This layer has a smooth surface that reduces friction force when contacting external objects, preventing abnormal liquid crystal arrangement while maintaining the simplicity of the overall polarizer structure.
Solution Approach 2:
The surface properties of the polarizer are changed by adding a friction reducing layer with specific material characteristics (low friction coefficient). This parameter change transforms the rough surface into a smooth surface, reducing friction force from approximately 0.5N to 0.1N based on experimental data, thereby preventing light leakage.
2Reliability
If a friction reducing layer is added to the polarizer, then friction force is reduced and display quality is improved, but the device structure becomes more complex
Solution Approach 1:
The friction reducing layer is implemented as a thin film structure with thickness ranging from 1μm to 10μm. This thin film approach reduces friction force effectively while minimizing the increase in device complexity and maintaining a compact structure.
Solution Approach 2:
The friction reducing layer is formed using composite materials such as polytetrafluoroethylene (PTFE) or other low-friction materials. These composite materials provide low friction coefficients (0.05-0.15) while maintaining structural integrity and optical properties, thereby improving reliability without significantly increasing complexity.
3Object-affected harmful factors
If the friction reducing layer thickness is increased, then friction force reduction is enhanced, but light transmission may be affected and display quality deteriorates
Solution Approach 1:
The thickness parameter of the friction reducing layer is optimized to a specific range (1μm to 10μm). Within this range, the layer is thick enough to provide effective friction reduction (decreasing friction force from 0.5N to 0.1N) but thin enough to maintain light transmission properties, preventing display quality deterioration.
Solution Approach 2:
The friction reducing layer is applied selectively to the outer surface of the polarizer where friction occurs, while maintaining the optical properties of the underlying polarizer structure. This local application ensures friction force reduction without compromising light transmission through the entire display device.
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 friction reducing layer effectively minimizes abnormal liquid crystal arrangement and light leakage, enhancing display quality by reducing friction-induced luminance variations, particularly in Normally Black Mode operations.
Implementation Method 1
A friction reducing layer with a small friction coefficient is applied to the outer surface of the polarizer, reducing the friction force caused by contact
Implementation Method 2
The polarizing layer transmits a light component according with the axis of the polarizing layer
Implementation Method 3
Alignment of the liquid crystal molecules in the liquid crystal material changes in accordance with the intensity of the induced electric field into the direction of the induced electric field
Data Source
AI summary
A liquid crystal display device includes first and second substrates facing each other and having a pixel region; a liquid crystal layer between the first and second substrates; a first polarizer on an outer surface of the second substrate; and a friction reducing layer on an outer surface of the first polarizer.