Polarizing Plate Retardation Film Axis Distortion Control
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Solution Overview
Problem
Polarizing plates in liquid crystal display apparatuses face reduced polarization efficiency and contrast ratio due to axis distortion between the retardation film and polarizer, and ultrahigh phase difference in protective films, which are not effectively addressed by existing modifications.
Innovation Solution
A polarizing plate design with a retardation film having an axis distortion of +0.03° to less than +0.2° and a protective film with an in-plane phase difference of 10,000 nm to 15,000 nm at 550 nm wavelength, optimized to prevent axis distortion and enhance polarization efficiency and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the protective film and retardation film have an ultrahigh phase difference, then the brightness and viewing angle are improved, but the polarization efficiency is reduced and contrast ratio deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the in-plane phase difference (Ro) of the protective film to be greater than 10,000 nm and less than or equal to 15,000 nm at a wavelength of 550 nm, and by controlling the axis distortion angle to be greater than +0.03° and less than +0.2°. These specific parameter ranges optimize both the brightness enhancement from high phase difference and the polarization efficiency by preventing excessive axis distortion between the polarizer and retardation film.
2Ease of manufacture
If the axis distortion between the absorption axis of the polarizer and the fast axis of the retardation film is increased to compensate for protective film distortion, then the manufacturing flexibility is improved, but the polarization efficiency and contrast ratio deteriorate
Solution Approach 1:
The patent establishes a precise parameter range for axis distortion (greater than +0.03° and less than +0.2°) that balances manufacturing flexibility with performance requirements. This controlled parameter range allows for practical manufacturing adjustments while maintaining sufficient polarization efficiency and contrast ratio, avoiding both excessive distortion that would harm performance and insufficient distortion that would complicate manufacturing.
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 optimized polarizing plate configuration improves polarization efficiency and contrast ratio in liquid crystal display apparatuses by controlling axis distortion and phase difference, resulting in enhanced display performance.
Implementation Method 1
a retardation film on a first side (e.g., a lower side) of the polarizer... The retardation film is disposed such that an angle between the fast axis of the retardation film and the absorption axis of the polarizer is about +0.03° to less than +0.2°
Implementation Method 2
The protective film has an in-plane phase difference (Ro) of greater than about 10,000 nm to about 15,000 nm or less at a wavelength of 550 nm
Implementation Method 3
Polarizing plates are used to control the oscillation direction of light... a polarizer... the absorption axis of the polarizer
Data Source
AI summary
A polarizing plate includes a polarizer, a retardation film on a first side (e.g., a lower side) of the polarizer, and a protective film on a second side (e.g., an upper side) of the polarizer. The retardation film has an axis distortion angle between a fast axis of the retardation film and an absorption axis of the polarizer of about +0.03° to less than +0.2°. The protective film has an in-plane phase difference (Ro) of greater than about 10,000 nm and about 15,000 nm or less at a wavelength of 550 nm. A liquid crystal display apparatus includes the polarizing plate.