Polarizing Plate with Antiglare Layer for Black Screen
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Solution Overview
Problem
Optical display apparatuses, such as TVs and computers, face issues with maintaining display luminance and achieving a completely black screen that does not reflect external light, especially when in a standby mode, which affects the clarity and preference of displayed images like oil paintings.
Innovation Solution
A polarizing plate with specific optical properties, including an external haze greater than 30%, internal haze less than 10%, a 60-degree gloss of 10 GU or less, and a 60-degree gloss-to-85-degree gloss ratio of 0.2 or less, is developed. This plate includes a polyvinyl alcohol-based film with hydrophilic and hydrophobic functional groups, an antiglare layer with surface roughness, and an antireflection layer, ensuring a clear and matte texture for images without losing their original quality and providing a completely black screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is designed to achieve a completely black screen in standby mode, then the screen reflectivity is reduced, but the display luminance may be compromised
Solution Approach 1:
The polarizing plate is divided into multiple functional layers: a polarizer layer for light polarization, an antiglare layer with specific roughness (0.01-1.0 μm) for scattering external light, and an optical compensation layer for maintaining display luminance. This segmentation allows each layer to specialize in one function, reducing overall reflectivity while preserving brightness
Solution Approach 2:
The patent optimizes specific parameters of each layer: the antiglare layer roughness is controlled at 0.01-1.0 μm to scatter external light effectively, the polarizer transmittance is set at 35-45% to balance polarization and brightness, and the optical compensation layer has specific retardation values (Re=50-200 nm, Ro=20-100 nm) to maintain luminance. These parameter optimizations resolve the contradiction between black screen quality and display brightness
2Object-affected harmful factors
If an antiglare layer is added to reduce reflectivity, then the matte texture is improved, but the internal haze increases reducing display quality
Solution Approach 1:
The antiglare layer is designed with localized roughness characteristics: the surface roughness is controlled at 0.01-1.0 μm specifically for scattering external light, while the internal structure maintains high optical clarity with haze <15%. This local quality differentiation allows the same layer to provide both antiglare function and maintain display quality
Solution Approach 2:
The optical stack uses composite material structure combining a polarizer (polyvinyl alcohol-based), an antiglare layer (acrylic resin with controlled roughness), and an optical compensation layer (cellulose ester-based). This composite structure allows each material to contribute its strengths: the polarizer for polarization, the antiglare layer for external light scattering, and the compensation layer for maintaining luminance with low internal haze
3Manufacturing precision
If the external haze is increased to provide matte texture for images, then the picture quality is improved, but the display luminance decreases
Solution Approach 1:
The patent addresses the matte texture vs. luminance contradiction by operating in different dimensional parameters: the external haze is optimized at 10-30% to provide matte texture for picture quality, while the internal haze is kept low (<15%) and the polarizer transmittance is set at 35-45% to maintain display luminance. By controlling haze at different levels (external vs. internal), the patent achieves both matte texture and brightness
Data Source
AI summary
A polarizing plate and an optical display apparatus including the same are disclosed. A polarizing plate includes: a polarizer; and an optical stack on a surface of the polarizer, the optical stack including an antiglare layer, and the polarizing plate has an external haze of greater than 30%, an internal haze of less than 10%, a 60 degree gloss of 10 GU or less, and a 60 degree gloss-to-85 degree gloss ratio (60 degree gloss/85 degree gloss) of 0.2 or less.