Segmented Polarizing Layer for Mirror-Display Dual Functionality
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Solution Overview
Problem
Mirror-type display devices face challenges in reflecting visible light sufficiently while maintaining display properties, making it difficult to serve both mirror and display functions effectively.
Innovation Solution
A display device configuration with a first and second substrate, a reflecting layer on the first substrate, a polarizing layer with a wire grid polarizer pattern and metal on the second substrate, a liquid crystal layer, and a retardation layer, where the polarizing layer includes both a polarizing portion and a reflecting portion, and the retardation layer is oriented at a specific angle to enhance reflectance and display capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional polarizing layer is used in a mirror-type display device, then display properties are maintained, but reflectance of visible light is insufficient
Solution Approach 1:
The polarizing layer is segmented into two distinct functional portions: a polarizing portion (using wire grid polarizer pattern) that maintains display properties by polarizing light, and a reflecting portion (using mirror reflecting layer) that enhances visible light reflectance. This segmentation allows each portion to optimize its specific function without compromising the other.
Solution Approach 2:
Different regions of the polarizing layer are assigned different local qualities: the polarizing portion uses a wire grid polarizer pattern optimized for light polarization, while the reflecting portion uses a mirror reflecting layer optimized for high reflectance. This local differentiation enables simultaneous achievement of display quality and mirror reflectance in different areas of the same layer.
2Measurement precision
If the polarizing layer uses a wire grid polarizer pattern, then polarization efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The wire grid polarizer pattern is designed to serve multiple functions: it provides efficient light polarization for display properties while also contributing to the overall reflectance enhancement when combined with the mirror reflecting layer. This multi-functionality reduces the need for separate specialized components and simplifies the overall manufacturing process.
3Illumination intensity
If a mirror reflecting layer is added to enhance reflectance, then visible light reflection is improved, but device complexity increases
Solution Approach 1:
The mirror reflecting layer is merged with the polarizing layer to form an integrated structure where the reflecting portion and polarizing portion coexist in the same layer. This merging eliminates the need for separate mirror and polarizer components, reducing overall device complexity while achieving both high reflectance and effective polarization.
Solution Approach 2:
The combined polarizing layer with mirror reflecting layer serves multiple functions simultaneously: it polarizes light for display properties, reflects visible light for mirror functionality, and maintains a relatively simple overall structure. This multi-functional design reduces device complexity compared to using separate independent components.
4Reliability
If the retardation layer is oriented at a specific angle (45 degrees), then display performance is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The retardation layer is oriented at a specific angle (about 45 degrees) relative to the polarization axis of the polarizing layer, which optimizes the display performance by achieving the desired polarization state and reflectance characteristics. This parameter optimization ensures that the liquid crystal molecules are aligned to provide maximum optical effect while maintaining compatibility with the polarizing and reflecting portions.
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 configuration allows for high reflectance and excellent display properties, enabling the device to function effectively as both a mirror and a display, with improved light reflection and minimal light loss, thus addressing the dual functionality challenge.
Implementation Method 1
a reflecting layer, which reflects light incident thereon, disposed on the first substrate
Implementation Method 2
a polarizing layer disposed on the second substrate and includes a polarizing portion that polarizes light incident on the polarizing portion
Implementation Method 3
a retardation layer between the liquid crystal layer and the polarizing layer
Implementation Method 4
a liquid crystal layer between the reflecting layer and the polarizing layer
Data Source
AI summary
A display device includes a first substrate and a second substrate opposing each other, a reflecting layer, which reflects light incident on the reflecting layer, on the first substrate, a polarizing layer which is disposed on the second substrate and includes a polarizing portion that polarizes light incident on the polarizing portion and a reflecting portion that reflects light incident on the reflecting portion, a liquid crystal layer between the reflecting layer and the polarizing layer, and a retardation layer between the liquid crystal layer and the polarizing layer.