Wire Grid Polarizer Fill Factor Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional polarized light illuminating apparatuses for liquid crystal displays have limitations in transmittance and process efficiency, which affect the manufacturing time and cost of liquid crystal display panels.
Innovation Solution
A polarizer with a wire grid metal pattern on a base substrate, optimized for extinction ratio and transmittance, is used in a polarized light illuminating apparatus, featuring a metal pattern of aluminum, molybdenum, or tungsten with specific height and fill factor ranges, and a method of manufacturing involving a metal layer formation and resist pattern etching to achieve improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polarized light illuminating apparatus uses conventional polarizer design, then extinction ratio of polarization is improved, but transmittance is reduced
Solution Approach 1:
The patent changes the geometric parameters of the wire grid structure, specifically setting the pitch to about 1/3 of the light wavelength and optimizing the fill factor within specific ranges (0.05-0.4 depending on metal material). This parameter optimization allows the polarizer to achieve both high extinction ratio and high transmittance simultaneously, resolving the traditional trade-off between these two parameters.
2Reliability
If traditional polarized light illuminating apparatus is used, then polarization function is achieved, but manufacturing time and cost increase
Solution Approach 1:
The patent extracts the essential polarization function from complex traditional polarizer structures and implements it through a simplified wire grid metal pattern on a base substrate. This extracted design maintains effective polarization functionality while enabling simpler, faster manufacturing processes, thereby reducing both manufacturing time and cost.
3Reliability
If wire grid pitch is reduced to improve polarization performance, then extinction ratio is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the pitch parameter to be about 1/3 of the light wavelength, which is a specific quantitative relationship that balances polarization performance with manufacturability. This parameter setting achieves high extinction ratio while maintaining reasonable manufacturing precision requirements, avoiding the need for extremely tight tolerances.
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 enhances the extinction ratio and transmittance of the polarizer, reducing manufacturing time and power consumption for liquid crystal display panels.
Implementation Method 1
A polarizer for polarizing light of a known wavelength includes a base substrate and a metal pattern disposed on the base substrate and forming a wire grid
Implementation Method 2
The fill factor is obtained by dividing the width by a pitch... The range of the fill factor is based on an extinction ratio of polarization and a transmittance of the polarizer
Data Source
AI summary
A polarizer includes a base substrate and a metal pattern disposed on the base substrate and forming a wire grid. The wire grid has a width and a height and spaced apart from adjacent wire grid by a separation distance. A pitch is a sum of the width and the separation distance. A fill factor is obtained by dividing the width by the pitch. The range of the fill factor is based on an extinction ratio of polarization and a transmittance of the polarizer.