Polarizing Plate Light Diffusion Layer Viewing Angle
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving improved viewing angle characteristics, particularly with gray scale inversion and dependency on viewing angle, as well as issues with polarizing plate durability and light leakage under severe environments.
Innovation Solution
A polarizing plate configuration comprising a first and second protective film, a polarizer, and a light diffusion layer with an internal haze of 45 to 80%, along with an optical compensation layer, is used in liquid crystal displays. This configuration includes a light diffusion layer with specific scattering light profiles and absorption axes oriented parallel or perpendicular to the polarizing plate, enhancing optical compensation and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical compensation film is added to improve viewing angle characteristics, then the viewing angle and optical compensation are improved, but the device complexity and number of layers increase
Solution Approach 1:
The patent combines the protective layer and optical compensation film into a single integrated structure. The protective layer is designed to possess both protective functions and optical compensation functions, eliminating the need for separate optical compensation films and reducing overall structure complexity while maintaining improved viewing angle characteristics
Solution Approach 2:
The protective layer is designed to serve multiple functions simultaneously: it provides mechanical protection to the polarizer while also providing optical compensation for the liquid crystal display. This multi-functional design reduces the number of separate components needed in the system
2Ease of manufacture
If the polarizing plate structure is simplified, then the manufacturing ease is improved, but the viewing angle characteristic and optical compensation may deteriorate
Solution Approach 1:
By merging the protective layer and optical compensation film into one integrated component, the manufacturing process is simplified as fewer separate layers need to be assembled, while the integrated structure still provides the necessary optical compensation for improved viewing angle characteristics
3Object-generated harmful factors
If a light diffusion layer with high internal haze is used to reduce light leakage, then the light leakage is reduced, but the transmission efficiency may decrease
Solution Approach 1:
The light diffusion layer is positioned specifically at the edges of the polarizing plate where light leakage occurs, rather than uniformly across the entire plate. This localized approach addresses the light leakage problem at critical areas while minimizing the impact on overall light transmission efficiency
Solution Approach 2:
The internal haze of the light diffusion layer is optimized to a specific range (45-80%) to balance light leakage reduction with light transmission efficiency. By controlling the haze parameter within this optimal range, the system achieves effective light leakage prevention while maintaining acceptable transmission performance
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 significantly improves viewing angle characteristics, reduces gray scale inversion, and enhances the reliability of liquid crystal displays under severe environments by minimizing light leakage and maintaining high display quality.
Implementation Method 1
a light diffusion layer which comprises a translucent resin and translucent particles having a refractive index different from a refractive index of the translucent resin
Implementation Method 2
the polarizing plate is obtained by dyeing the polarizer with iodine
Implementation Method 3
An optical compensation film is used to alleviate image coloring or extend a viewing angle in liquid crystal displays
Data Source
AI summary
A polarizing plate for a liquid crystal display is provided and includes a first protective film, a polarizer, a second protective film and a light diffusion layer in order. The light diffusion layer is a layer including a translucent resin and translucent particles having a refractive index different from a refractive index of the translucent resin. The internal haze of the light diffusion layer is 45% to 80%.