Optical Film Phase Difference Layers Suppress Light Leakage
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Solution Overview
Problem
Conventional optical films are inadequate in suppressing light leakage during black display in flat panel displays, failing to provide sufficient optical compensation.
Innovation Solution
An optical film with multiple phase difference layers, specifically designed with optical properties represented by certain formulas, including chromatic coordinates and in-plane phase difference values, is developed. These layers are formed by polymerizing polymerizable liquid crystals and can include a protective layer, with specific thickness and orientation to enhance transparency and reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical films are used, then the structure is simple and manufacturing is easy, but light leakage suppression in black display is insufficient
Solution Approach 1:
The optical film is divided into multiple phase difference layers with different optical properties. Each layer has specific phase difference values and chromatic coordinates that work together to suppress light leakage across different wavelengths, transforming a single-layer structure into a multi-layer segmented system.
Solution Approach 2:
The patent uses composite material structures by combining multiple phase difference layers with different refractive indices and phase difference characteristics. This composite approach allows the optical film to achieve superior light leakage suppression by leveraging the complementary properties of each layer.
2Reliability
If multiple phase difference layers with specific optical properties are introduced, then light leakage suppression is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for each phase difference layer, including phase difference values (Re(450), Re(550), Re(650)), chromatic coordinates (a*, b*), and thickness ratios. By defining these parameters within specific ranges, the invention enables controlled manufacturing while achieving the desired optical compensation properties.
3Reliability
If the phase difference layers are optimized for wavelength-specific phase differences, then optical compensation is improved, but the number of layers and structural complexity increase
Solution Approach 1:
Each phase difference layer is designed with local quality characteristics - specific phase difference values and chromatic coordinates tailored to compensate for light leakage at different wavelengths. The first layer targets blue light suppression while the second layer addresses red light suppression, with each layer having optimized local optical properties.
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 optical film effectively suppresses light leakage in black displays, ensuring improved transparency and color accuracy by optimizing the optical properties of the phase difference layers.
Implementation Method 1
the third phase difference layer is a coating layer formed by polymerizing at least one polymerizable liquid crystal
Implementation Method 2
nx represents the principal refractive index in a direction parallel to the film plane in an index ellipsoid formed by the phase difference layer
Data Source
AI summary
To provide an optical film excellent in suppression of light leakage in black display. An optical film having at least two phase difference layers and having optical properties represented by the formulae (30) and (31) is provided:−2.0≤a*≤0.5 (30)−0.5≤b*≤5.0 (31)wherein, a* and b* represent the chromatic coordinate in the L*a*b* color system.