Polarizing Plate Haze Control for TV Contrast
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Solution Overview
Problem
Liquid crystal displays, particularly non-driven frame TVs, face challenges in achieving high contrast ratios while maintaining a matte texture to ensure images appear to stick to the screen rather than floating off, with existing polarizing plates failing to provide sufficient clarity and contrast.
Innovation Solution
A polarizing plate is designed with a first protective film having a total haze of 40% to 60% and an internal haze of 3% to 7%, along with a light transmittance ratio of 0.008 or less, which includes a base layer and an antiglare layer with organic or inorganic particles, and optionally an antireflection layer, to enhance contrast and matte texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizing plate with high total haze is used to achieve matte texture, then the matte texture is improved, but the contrast ratio deteriorates
Solution Approach 1:
The first protective film is segmented into two functional layers: a base layer providing structural support and an antiglare layer providing matte texture. This segmentation allows each layer to be optimized independently, with the antiglare layer containing particles (inorganic or organic) that scatter light to create matte effect while the base layer maintains optical clarity, thus achieving both matte texture and high contrast ratio simultaneously
Solution Approach 2:
The polarizing plate uses a composite structure combining the polarizer layer with the first protective film that has specific haze characteristics (total haze 40-60%, internal haze 3-7%). The composite material approach allows the protective film to contribute both mechanical protection and optical properties (matte texture) while the polarizer maintains polarization function, achieving a balance between matte texture and contrast ratio
2Reliability
If the light transmittance ratio is reduced to improve contrast ratio, then the contrast ratio is improved, but the visibility of the screen deteriorates
Solution Approach 1:
The patent optimizes specific parameters of the first protective film: total haze controlled at 40-60% and internal haze at 3-7%. By precisely controlling these haze parameters, the film provides sufficient matte texture while maintaining adequate light transmission. Additionally, the light transmittance ratio is optimized to achieve high contrast ratio (0.003 to 0.008) while preserving screen visibility through proper balance of optical properties
3Device complexity
If a simple protective film structure is used to reduce manufacturing complexity, then the manufacturing complexity is reduced, but the ability to provide both matte texture and high contrast ratio deteriorates
Solution Approach 1:
The protective film is divided into two layers: base layer and antiglare layer. This segmentation enables each layer to perform its specific function - the base layer provides structural integrity and adhesion, while the antiglare layer with embedded particles provides matte texture. The segmented structure achieves superior optical performance compared to a single-layer film, while remaining manufacturable through conventional coating and particle embedding processes
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 plate effectively improves contrast ratios and maintains a matte texture, ensuring images appear to stick to the screen, while preventing reddish colors in black modes and enhancing polarization performance.
Implementation Method 1
an antiglare layer with organic or inorganic particles, and optionally an antireflection layer, to enhance contrast and matte texture
Implementation Method 2
a polarizer; and a first protective film stacked on a surface of the polarizer
Data Source
AI summary
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; and a first protective film stacked on a surface of the polarizer, and the first protective film has a total haze of 40% to 60% and an internal haze of 3% to 7%, and the polarizing plate has a light transmittance ratio of 0.008 or less, as calculated according to Equation 1.