Segmented Polarization Analyzer for LCD Confidentiality
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) lack effective security measures to prevent unauthorized viewing from angles other than the direct front, allowing confidential information to be accessed by individuals positioned to the side or using hidden cameras.
Innovation Solution
The implementation of a liquid crystal display panel with a polarization analyzer featuring alternating polarization and non-polarization regions, where the polarization device includes a nano wire line polarizer or a structure with liquid crystal molecules and dichroism dye molecules, allowing only authorized viewers with special eyeglasses to access information in non-polarization regions by adjusting the polarizer's axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional LCD with a single uniform polarization layer is used, then the display structure is simple and manufacturing is easy, but the information security and confidentiality are compromised as anyone can view the display from any angle
Solution Approach 1:
The polarization analyzer is divided into multiple polarization regions with different polarization directions (first, second, third, and fourth polarization regions). Each region has a specific polarization direction that corresponds to different pixel groups, creating segmented viewing zones that prevent unauthorized viewing from any single angle while maintaining overall display functionality.
Solution Approach 2:
Different regions of the polarization analyzer have different local polarization properties. The first polarization region has a first polarization direction, the second has a second polarization direction, and so on. This local differentiation ensures that only viewers at specific positions can see certain information, enhancing security through spatially varying optical properties.
2Loss of information
If a uniform polarization analyzer is used across the entire display, then the manufacturing process is simple and cost-effective, but viewers from different angles can access the same information without restriction
Solution Approach 1:
The polarization analyzer is segmented into distinct polarization regions (first, second, third, fourth regions) with different polarization directions. This segmentation is achieved through a multi-step manufacturing process involving sequential coating of polarization layers and selective removal, which protects information confidentiality by ensuring different viewing angles see different polarized information.
Solution Approach 2:
The manufacturing process performs preliminary actions by sequentially forming multiple polarization layers (first polarization layer, second polarization layer, third polarization layer) with specific orientations before final assembly. This preliminary structuring of polarization directions during manufacturing enables the security function without requiring complex post-processing.
3Reliability
If multiple polarization regions with different directions are implemented, then unauthorized viewing from side angles is prevented, but the device structure and manufacturing process become more complex
Solution Approach 1:
The polarization analyzer is segmented into four distinct polarization regions with different polarization directions (first, second, third, and fourth directions). This segmentation creates multiple viewing zones that prevent unauthorized access to display information from side angles, as each region only transmits light polarized in its specific direction.
Solution Approach 2:
The polarization analyzer introduces asymmetry by having different polarization directions in different regions rather than a uniform polarization direction across the entire display. This asymmetric polarization structure ensures that viewers from different positions experience different optical properties, thereby preventing unauthorized viewing while maintaining display functionality.
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
Enhances the security and confidentiality of information displayed on LCDs by ensuring that only authorized viewers can access sensitive information, even if others are positioned to see the screen, thereby preventing unauthorized data capture.
Implementation Method 1
When no voltage is applied to the first transparent electrode layer and the second transparent electrode layer, both the liquid crystal molecules and the dichroism dye molecules in the polarization layer are oriented in parallel to the opposed substrate. When a voltage is applied to the first transparent electrode layer and the second transparent electrode layer, both the liquid crystal molecules and the dichroism dye molecules in the polarization layer are oriented in an electric field direction.
Implementation Method 2
a polarization layer having liquid crystal molecules and dichroism dye molecules
Implementation Method 3
The polarization analyzer includes a plurality of polarization regions and a plurality of non-polarization regions. A portion of the polarization analyzer corresponding to the polarization region is a polarization device, and the polarization regions and non-polarization regions are arranged alternately.
Data Source
AI summary
A liquid crystal display includes a liquid crystal display panel including a thin film transistor (TFT) array substrate, an opposed substrate, and a liquid crystal layer between the TFT array substrate and the opposed substrate. A lower polarizer is disposed on a side of the TFT array substrate facing away from the liquid crystal layer, and the opposed substrate is provided with a polarization analyzer. The polarization analyzer includes a plurality of polarization regions and a plurality of non-polarization regions. A portion of the polarization analyzer corresponding to the polarization region is a polarization device, and the polarization regions and non-polarization regions are arranged alternately. The LCD can improve the security and confidentiality of the information displayed on the LCD when a user views the information. And special eyeglasses and display apparatus are also provided.