Multi-Layer Polarizing Device for Uniform Brightness Through Polarized Glasses
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Solution Overview
Problem
Liquid crystal display panels used in outdoor and vehicle-mounted devices experience significant brightness differences when viewed by users wearing polarized sunglasses or glasses, and the high reflectivity of glass surfaces exacerbates these differences due to light reflection.
Innovation Solution
A polarizing device comprising a first polarizing layer and at least two second polarizing layers, where the light transmission axis of the first polarizing layer is parallel to the first polarizing layer, and the phase delay axis of the second polarizing layer is parallel to the second polarizing layer, forming an included angle that converts linear polarized light into polarized light with a closed curve pattern, thereby expanding the visual viewing angle and reducing light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single polarizer is used in the liquid crystal display panel, then the device structure is simple, but the brightness uniformity deteriorates when viewed through polarized glasses at different positions
Solution Approach 1:
The single polarizer is segmented into multiple polarizing layers (first polarizing layer and at least one second polarizing layer) with different optical axis orientations. This segmentation allows each layer to contribute differently to the overall polarization effect, enabling consistent brightness transmission when viewed through polarized glasses from various positions, thus resolving the brightness uniformity issue while maintaining reasonable structural complexity
Solution Approach 2:
The patent employs a composite polarizing structure combining multiple polarizing layers with different optical properties. The first polarizing layer has a first optical axis direction while the second polarizing layer has a second optical axis direction that forms a specific angle with the first, creating a composite optical system that achieves superior brightness uniformity performance when viewed through polarized glasses
2Strength
If glass with high reflectivity is used for the display panel surface, then the mechanical strength and protection are improved, but the light reflection increases causing brightness differences
Solution Approach 1:
The patent converts the harmful effect of light reflection into a beneficial outcome by using the reflected light path to its advantage. The multi-layer polarizing structure is designed so that light reflecting off the glass surface undergoes specific polarization transformations that allow it to pass through the polarizing layers in a controlled manner, thereby reducing the negative impact of reflection on brightness uniformity while maintaining the protective function of the glass
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 polarizing device increases the visual viewing angle of the display screen, ensuring consistent brightness across different viewing positions and reducing the impact of reflected light, thereby enhancing user experience.
Implementation Method 1
a light transmission axis of the first polarizing layer is parallel to the first polarizing layer, a phase delay axis of the second polarizing layer is parallel to the second polarizing layer, an orthographic projection of the light transmission axis onto the first polarizing layer intersects with an orthographic projection of the phase delay axis onto the first polarizing layer to form an included angle, the included angle is configured to convert linear polarized light incident on the polarization assembly into polarized light emitted from the polarization assembly, a cross section of the polarized light is of a closed curve pattern
Implementation Method 2
a phase delay axis of the second polarizing layer is parallel to the second polarizing layer, an orthographic projection of the light transmission axis onto the first polarizing layer intersects with an orthographic projection of the phase delay axis onto the first polarizing layer to form an included angle
Implementation Method 3
the surface of the liquid crystal display panel is mostly made of glass, and the glass has a relatively high reflectivity, so under the irradiation of light, a relatively large amount of light is easily reflected
Data Source
AI summary
A polarizing device and a method for manufacturing the polarizing device, a display panel and a display device are provided. The polarizing device comprises a first polarizing layer and at least two second polarizing layers, wherein each of two sides of the first polarizing layer is provided with respective at least one of the second polarizing layers; a light transmission axis of the first polarizing layer is parallel to the first polarizing layer, a phase delay axis of the second polarizing layer is parallel to the second polarizing layer, an orthographic projection of the light transmission axis onto the first polarizing layer intersects with an orthographic projection of the phase delay axis onto the first polarizing layer to form an included angle, the included angle is configured to convert linear polarized light incident on the polarization assembly into polarized light emitted from the polarization assembly.