Polarizer Depolarizing Layer Resonance Scattering Eye Fatigue
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Solution Overview
Problem
Traditional liquid crystal displays (LCDs) using linear polarizers can cause eye fatigue and display color shift due to high linear polarization, and existing solutions like Quarter-Wave Plates (QWP) suffer from inefficiencies in optical rotation across different wave bands, leading to reduced brightness and color issues.
Innovation Solution
A polarizer with a depolarizing layer comprising nanoparticles and a reflective part that generates resonance scattering, converting linearly polarized light into near-natural light, reducing eye fatigue and preventing color shift by adjusting particle sizes and thicknesses for specific wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear polarizer is used in LCD to achieve high linear polarization degree (99.8%), then the display function is realized, but eye fatigue is caused
Solution Approach 1:
The patent uses a composite structure combining a polarizing layer with a depolarizing layer containing metal nanoparticles (silver, aluminum, or copper) with core-shell or hollow structures. This composite material approach allows the system to maintain the polarizing function while introducing depolarizing particles that convert linearly polarized light into partially depolarized light, reducing eye fatigue without completely sacrificing display functionality.
Solution Approach 2:
The patent controls the polarization degree by adjusting parameters such as nanoparticle concentration (0.1-10 mg/mL), particle size (20-200 nm), and shell thickness. By changing these parameters, the system can achieve different levels of depolarization while maintaining adequate display function, thus resolving the contradiction between display reliability and eye fatigue reduction.
2Object-affected harmful factors
If a Quarter-Wave Plate (QWP) is used to convert linearly polarized light into circularly polarized light, then eye fatigue is reduced, but optical rotation efficiency varies across wave bands causing color shift and reduced brightness
Solution Approach 1:
The patent employs metal nanoparticles with specific local structural characteristics (core-shell or hollow structures with controlled shell thickness of 5-50 nm) that create localized surface plasmon resonance. This local quality control allows selective interaction with different wavelengths of light, achieving depolarization while maintaining color accuracy across the visible spectrum, unlike QWP which has uniform optical rotation that varies with wavelength.
Solution Approach 2:
The patent deliberately controls the optical properties to maintain color fidelity. By selecting metal nanoparticles (silver, aluminum, copper) with appropriate size and structure, the system achieves depolarization without the wavelength-dependent optical rotation that causes color shift in QWP. The resonance scattering properties of the nanoparticles are tuned to maintain natural color perception while reducing polarization effects.
3Object-affected harmful factors
If a depolarizing layer with nanoparticles is introduced to reduce linear polarization, then eye fatigue is reduced and color shift is prevented, but device structure becomes more complex
Solution Approach 1:
The patent combines the polarizing layer and depolarizing layer into a single integrated polarizer structure. The depolarizing layer is applied directly onto the polarizing layer, merging multiple functions (polarization and depolarization) into one component. This reduces overall device complexity compared to using separate QWP and polarizer layers, while achieving both eye fatigue reduction and color accuracy.
Solution Approach 2:
The patent uses thin film structures for the depolarizing layer with metal nanoparticles embedded in a transparent matrix. The thin film approach (with controlled thickness) allows the depolarizing function to be added without significantly increasing overall device thickness or complexity. The flexible thin film structure can be integrated into existing LCD architectures with minimal modification.
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 polarizer effectively reduces linear polarization, minimizing eye fatigue and eliminating color shift when used in display devices, ensuring healthy display and compatibility with polarized sunglasses.
Implementation Method 1
the reflective part covering the nanoparticles generates resonance scattering with incident light
Implementation Method 2
the reflective part covering the nanoparticles generates resonance scattering with incident light
Implementation Method 3
The light emitted by the backlight source is mainly natural light, which is filtered by the lower polarizer into linearly polarized light
Implementation Method 4
the polarization direction of the light is changed by the birefringence of the liquid crystal
Data Source
AI summary
The present application discloses a polarizer and a preparation method thereof and a display device. Embodiments of the present disclosure provides a polarizer, wherein the polarizer includes: a polarizing layer, and a depolarizing layer located on a light emitting side of the polarizing layer; the depolarizing layer includes: nanoparticles, and a reflective part covering the nanoparticles; and the reflective part covering the nanoparticles generates resonance scattering with incident light.