LCD Polarizer Structure for Viewing with Sunglasses
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Solution Overview
Problem
Liquid crystal display devices, such as those in vehicles or mobile phones, are not viewable when a user wears polarized sunglasses due to the angle-dependent polarization of light, causing image obstruction and user annoyance.
Innovation Solution
The implementation of a polarizer structure that includes a linear-polarizing layer and a circular-polarizing layer over the liquid crystal panel, converting linear-polarized light to circular-polarized light to ensure image visibility regardless of the angle of the polarized sunglasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a linear polarizer is used on the liquid crystal panel, then the display can function properly with standard viewing conditions, but users wearing polarized sunglasses cannot view the image at certain angles
Solution Approach 1:
The polarizer is divided into two separate layers: a linear polarizer layer and a circular polarizer layer. This segmentation allows each layer to perform its specific function independently, with the linear layer handling standard display requirements and the circular layer enabling compatibility with polarized sunglasses, thereby resolving the contradiction between display functionality and adaptability.
Solution Approach 2:
The invention uses a composite polarizer structure combining linear and circular polarizing properties in a single integrated component. This composite approach allows the display to maintain its standard linear polarization characteristics while simultaneously providing circular polarization components that enable viewing with polarized sunglasses, thus improving adaptability without requiring completely separate systems.
2Adaptability or versatility
If the polarizer structure is changed to accommodate polarized sunglasses, then viewability improves, but the manufacturing process becomes more complex
Solution Approach 1:
By segmenting the polarizer into distinct linear and circular layers, each layer can be manufactured and tested independently using established processes, then assembled together. This reduces manufacturing complexity compared to creating a single complex polarizing element, as each segment can be produced with existing technology and quality control methods.
Solution Approach 2:
The circular polarizer layer acts as an intermediary between the linear polarizer layer and the viewer's polarized sunglasses. This intermediary layer converts the linearly polarized light into circularly polarized light, enabling compatibility with polarized sunglasses without requiring changes to the original linear polarizer or the display hardware, thus simplifying the manufacturing process.
3Illumination intensity
If a single polarizer layer is used, then the device structure remains simple, but image visibility is blocked at certain angles when wearing polarized sunglasses
Solution Approach 1:
The invention employs a composite polarizer structure where the linear polarizer layer maintains high light transmission for standard viewing conditions, while the added circular polarizer layer provides the necessary circular polarization components. This composite approach ensures that the linear polarizer continues to function optimally for its original purpose while the circular layer enables compatibility with polarized sunglasses, thus resolving the contradiction between illumination intensity and adaptability.
Solution Approach 2:
Segmenting the polarizer function into separate linear and circular layers allows each layer to optimize its light transmission characteristics for its specific function. The linear layer can be designed for maximum transmission in the display's primary viewing direction, while the circular layer adds the necessary polarization flexibility without compromising the linear layer's performance, thereby maintaining high illumination intensity while improving adaptability.
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
Enables users to view images on liquid crystal display devices while wearing polarized sunglasses by converting linear-polarized light to circular-polarized light, reducing the impact of polarized sunglasses on image visibility and enhancing user experience.
Implementation Method 1
a linear-polarizing layer over the panel that linear-polarizes light from the backlight device
Implementation Method 2
a circular-polarizing layer over the linear-polarizing layer that circular-polarizes the linear-polarized light
Data Source
AI summary
A Liquid Crystal Display (LCD) device includes: a panel on which images are implemented; a backlight device below the panel and providing light; and a polarizer including a linear-polarizing layer over the panel that linear-polarizes light from the backlight device and a circular-polarizing layer over the linear-polarizing layer that circular-polarizes the linear-polarized light.