Wire Grid Polarizer Direct Formation on LCD Substrate
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Solution Overview
Problem
Conventional liquid crystal display devices require separate polarizing plates, increasing thickness and manufacturing costs, and pose challenges in protecting thin film transistors due to the need for additional layers.
Innovation Solution
A wire grid polarizer is directly formed on the lower substrate with metal patterns, a first protective layer, and a second protective layer including low dielectric material, reducing the overall thickness and minimizing the deterioration of thin film transistor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a separate polarizing plate is used in conventional liquid crystal display devices, then the polarizing function is achieved, but the thickness of the device increases and manufacturing costs increase
Solution Approach 1:
The patent merges the polarizing function with the lower substrate by directly forming metal patterns (wire grid structure) on the lower substrate. This integration eliminates the need for a separate polarizing plate, thereby reducing device thickness and structural complexity while maintaining the polarizing function.
Solution Approach 2:
The lower substrate is given multiple functions: it serves as both the structural base and the polarizing element through the integrated wire grid structure. This multi-functionality reduces the number of separate components needed, addressing the thickness and complexity issues.
2Length of moving object
If metal patterns are formed directly on the lower substrate to create a wire grid polarizer, then the thickness is reduced, but the thin film transistors may deteriorate due to lack of protection
Solution Approach 1:
Protective layers are formed on the metal patterns before the thin film transistors are fabricated. This preliminary protective action prevents direct exposure of the metal patterns to subsequent processing steps and environmental factors, thereby protecting the thin film transistor characteristics while maintaining the integrated structure.
Solution Approach 2:
Protective layers are introduced as intermediary elements between the metal patterns and the thin film transistors. These layers mediate the interaction by providing physical and chemical protection to the metal patterns during TFT fabrication and operation, ensuring reliable TFT characteristics.
3Reliability
If protective layers are added to protect the metal patterns, then the thin film transistor characteristics are protected, but the overall thickness may increase
Solution Approach 1:
The patent employs thin film protective layers that provide adequate protection to the metal patterns and thin film transistors while maintaining minimal thickness. These thin films balance the need for protection with the requirement to keep the overall device thickness reduced.
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
This configuration decreases the thickness of the liquid crystal display device, enhances thermal resistance, and reduces manufacturing costs by eliminating the need for a separate polarizing plate while protecting thin film transistors effectively.
Implementation Method 1
A wire grid polarizer is directly formed on the lower substrate
Implementation Method 2
The first protective layer may include a material having a refractive index lower than that of the transparent substrate
Implementation Method 3
a second protective layer on the first protective layer and including a plurality of layers, the plurality of layers including a low dielectric material layer having a dielectric constant of no more than about 3
Data Source
AI summary
A liquid crystal display device includes a wire grid polarizer, in which the wire grid polarizer is directly formed on a lower substrate, thereby decreasing the thickness of the liquid crystal display. In the wire grid polarizer formed on the lower substrate, a plurality of protective layers are formed on polarizing patterns that perform a polarizing function, so that it is possible to reduce or minimize the deterioration of characteristics of thin film transistors of the liquid crystal display, which are formed on the protective layers.