Wire Grid Polarizer LCD Cell Structure for High Contrast
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Solution Overview
Problem
Active matrix liquid crystal display (AMLCD) devices face challenges in achieving high dynamic contrast ratio comparable to active matrix OLEDs, with existing dual-cell LCD structures being bulky, heavy, and expensive due to the use of multiple glass substrates.
Innovation Solution
A compact display cell structure is developed, utilizing a wire grid polarizer layer and polymer liquid crystal layers between two substrates, with a common electrode layer formed by indium tin oxide, to enhance contrast ratio while reducing weight and cost by eliminating unnecessary substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-cell LCD cell structure is used to enhance dynamic contrast, then the contrast ratio is improved, but the device becomes bulky, heavy, and expensive due to requiring four glass substrates
Solution Approach 1:
The patent merges two separate LCD cells into a single integrated structure where a first liquid crystal layer and a second liquid crystal layer are disposed between only two substrates. The wire grid polarizer is positioned between the two liquid crystal layers within this single cell structure, eliminating the need for four separate substrates while maintaining the dual-cell functionality for enhanced dynamic contrast ratio.
Solution Approach 2:
The single substrate structure serves multiple functions: it supports both the first and second liquid crystal layers, provides mounting surfaces for both pixel electrode arrays, and accommodates the wire grid polarizer in between. This multi-functional design achieves the contrast enhancement of a dual-cell structure without the weight and cost penalties of four separate substrates.
2Reliability
If a dual-cell LCD cell structure is used to enhance dynamic contrast, then the contrast ratio is improved, but the device becomes bulky and expensive due to requiring four glass substrates
Solution Approach 1:
The patent merges two separate LCD cells into a single integrated structure where a first liquid crystal layer and a second liquid crystal layer are disposed between only two substrates. The wire grid polarizer is positioned between the two liquid crystal layers within this single cell structure, eliminating the need for four separate substrates while maintaining the dual-cell functionality for enhanced dynamic contrast ratio.
3Reliability
If a wire grid polarizer layer is used between two substrates with two liquid crystal layers, then the dynamic contrast ratio is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The wire grid polarizer is formed on the first substrate before the liquid crystal layers are assembled. This preliminary formation allows the polarizer to be integrated into the substrate structure early in the manufacturing process, simplifying subsequent assembly steps and reducing overall manufacturing complexity despite the advanced functionality it provides.
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 achieves a high dynamic contrast ratio with significantly reduced weight, volume, and cost, making it more competitive with OLEDs, and allows for a more efficient use of materials and manufacturing processes.
Implementation Method 1
a wire grid polarizer layer disposed between the first substrate and the second substrate
Implementation Method 2
a liquid crystal layer disposed in the second cell gap between the second substrate and the wire grid polarizer layer
Data Source
AI summary
A display cell structure is provided. A first substrate and a second substrate are spaced apart from each other, and a wire grid polarizer layer is disposed therebetween, forming a first cell gap between the first substrate and the wire grid polarizer layer and a second cell gap between the second substrate and the wire grid polarizer layer. A first display structure is disposed in the first cell gap, and includes multiple first pixel electrodes and a polymer liquid crystal layer. A polarizer layer is disposed on the second substrate and facing an opposite side to the wire grid polarizer layer. A second display structure is disposed in the second cell gap, and includes multiple second pixel electrodes and a liquid crystal layer.