Liquid Crystal Display Polarizer with Low Reflection Layers
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Solution Overview
Problem
Conventional liquid crystal displays face challenges in reducing reflectivity of polarizers, leading to difficulties in image visibility due to external light reflection, especially when ambient light is bright.
Innovation Solution
A polarizer design featuring metal lines arranged at regular intervals with low reflection layers, where the interval and width of the metal lines are optimized to be smaller than a visible wavelength, and the low reflection layers, made of nitrides or metal nitrides, are strategically positioned to reduce reflectivity to 10% or less, enhancing light efficiency and image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional polarizer structures are used, then the polarizer can maintain basic light transmission, but the reflectivity remains high causing poor image visibility in bright environments
Solution Approach 1:
The polarizer is segmented into multiple functional layers: metal lines (aluminum, silver, or transparent conductive materials) arranged in specific patterns, low reflection layers (nitride materials like SiNx, TiNx, AlNx), and protective layers. This segmentation allows each layer to perform its specific function - the metal lines provide polarization while the nitride layers reduce reflection through refractive index matching, achieving both polarization and low reflectivity simultaneously
Solution Approach 2:
The invention uses composite material structures combining metals (aluminum, silver) with transparent conductive materials (ITO, IZO, GZO, AZO) and nitride materials (SiNx, TiNx, AlNx). These composite structures optimize both the polarization function and the anti-reflection function, reducing reflectivity to 10% or less while maintaining light transmission for image visibility
2Ease of manufacture
If the metal line interval is increased to simplify manufacturing, then the manufacturing process becomes easier, but the reflectivity control and polarization efficiency deteriorate
Solution Approach 1:
The invention specifies precise parameter ranges: metal line intervals of 1-10 μm, widths of 0.1-5 μm, and low reflection layer thicknesses of 50-200 nm. By optimizing these parameters within specific ranges, the patent achieves effective reflectivity control and polarization efficiency while maintaining manufacturability through standardized fabrication processes
3Device complexity
If a single-layer low reflection coating is used, then the manufacturing process is simpler, but the reflectivity reduction effectiveness is insufficient
Solution Approach 1:
The invention transitions from single-layer to multi-layer low reflection structures, adding the dimension of layer stacking. The typical structure includes a first low reflection layer (50-150 nm thick) and a second low reflection layer (50-200 nm thick) with different nitride materials, creating a multi-layer optical stack that achieves superior reflectivity reduction (≤10%) through constructive interference and refractive index gradient effects
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 proposed solution effectively reduces reflectivity to 10% or less, improving image visibility by optimizing the arrangement and materials of the polarizer, thereby enhancing light efficiency and user experience in bright environments.
Implementation Method 1
a plurality of low reflection layers on the plurality of metal lines, the plurality of low reflection layers contacting respective upper parts of the plurality of metal lines and having an interval and a width about equal to an interval and a width of the plurality of metal lines, wherein the interval of the plurality of metal lines is smaller than a wavelength of a visible ray, and light incident from an upper side of the plurality of low reflection layers is reflected with reflectivity equal to or smaller than 10%
Data Source
AI summary
A polarizer and a liquid crystal display including the polarizer, the polarizer including a plurality of metal lines extending in one direction and being arranged at regular intervals; and a plurality of low reflection layers on the plurality of metal lines, the plurality of low reflection layers contacting respective upper parts of the plurality of metal lines and having an interval and a width about equal to an interval and a width of the plurality of metal lines, wherein the interval of the plurality of metal lines is smaller than a wavelength of a visible ray, and light incident from an upper side of the plurality of low reflection layers is reflected with reflectivity equal to or smaller than 10%.