Polarizing Plate Retardation and Haze Control
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Solution Overview
Problem
Conventional polarizing plates using PET films with low moisture permeability suffer from visible rainbow stains due to inherent optical anisotropy, and achieving a balance between preventing rainbow stains and maintaining luminance is challenging, especially when the in-plane retardation is reduced to prevent film breakage during fabrication.
Innovation Solution
A polarizing plate design featuring a protective film with a polyester-based base layer and an antiglare layer, where the protective film has an in-plane retardation of 100 nm to 4,000 nm, a total haze of 40% to 80%, and a haze ratio of internal to external haze greater than 0 to 0.2, which prevents rainbow stains while improving luminance by adjusting the in-plane retardation and haze characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the in-plane retardation of the protective film is reduced to prevent film breakage during fabrication, then mechanical reliability is improved, but rainbow stains become more visible
Solution Approach 1:
The patent applies parameter changes by precisely controlling the in-plane retardation within 100 nm to 4,000 nm and total haze within 40% to 80% to simultaneously achieve mechanical reliability and rainbow stain prevention. This quantitative parameter optimization resolves the contradiction between low retardation (for mechanical strength) and high retardation (for rainbow prevention).
Solution Approach 2:
The patent uses composite materials by combining a polyester-based base layer with an antiglare layer having specific haze characteristics. This composite structure allows the base layer to provide mechanical strength while the antiglare layer controls light scattering to prevent rainbow stains, resolving the contradiction through material composition rather than single-material property optimization.
2Illumination intensity
If the total haze of the protective film is increased to improve luminance, then luminance is enhanced, but the balance with rainbow stain prevention becomes difficult to maintain
Solution Approach 1:
The patent applies parameter changes by establishing a specific relationship between in-plane retardation (100 nm to 4,000 nm) and total haze (40% to 80%). By optimizing both parameters within defined ranges and controlling their interaction, the patent achieves enhanced luminance while preventing rainbow stains, resolving the contradiction through coordinated parameter optimization rather than single-parameter adjustment.
Solution Approach 2:
The patent uses the antiglare layer as an optical intermediary that copies and redistributes light paths through controlled scattering. This layer acts as a mediator between the base layer and the external environment, managing light distribution to enhance luminance while maintaining rainbow stain prevention through its specific haze properties.
3Object-affected harmful factors
If the haze ratio of internal haze to external haze is optimized to prevent rainbow stains, then rainbow stain visibility is reduced, but luminance performance may be compromised
Solution Approach 1:
The patent applies parameter changes by controlling the haze ratio of internal haze to external haze within greater than 0 to 0.2, in conjunction with total haze of 40% to 80%. This precise ratio control optimizes the distribution of light scattering between internal and external interfaces, achieving rainbow stain prevention while maintaining luminance performance through balanced optical parameter optimization.
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 effectively prevents rainbow stains and enhances luminance in optical display applications, maintaining the mechanical reliability of PET films without risking film breakage, even with lower in-plane retardation, and achieves a balance between haze and luminance performance.
Implementation Method 1
the protective film has an in-plane retardation of 100 nm to 4,000 nm at a wavelength of 550 nm
Implementation Method 2
a total haze of 40% to 80%, and a haze ratio of internal haze to external haze of greater than 0 to 0.2
Data Source
AI summary
A polarizing plate and an optical display apparatus are disclosed. A polarizing plate includes a polarizer and a protective film stacked on a light exit surface of the polarizer, and the protective film includes a polyester based base layer and an antiglare layer stacked on a surface of the polyester based base layer, and the protective film has an in-plane retardation of 100 nm to 4,000 nm at a wavelength of 550 nm, a total haze of 40% to 80%, and a ratio of internal haze to external haze of greater than 0 to 0.2.