Multilayer Phase Difference Plate Wavelength Uniformity
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Solution Overview
Problem
Phase difference plates used in display devices fail to achieve uniform optical effects across a wide wavelength range.
Innovation Solution
A phase difference plate formed with a liquid crystal material, specifically oriented in an in-plane direction, using a polymerizable liquid crystal compound with a specific structure, ensuring in-plane retardation values satisfy certain formulas to achieve uniform optical performance across a wide wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional phase difference plates are used, then the device structure is simple, but uniform optical effects in a wide wavelength range cannot be achieved
Solution Approach 1:
The phase difference plate is divided into multiple layers with different retardation characteristics. Each layer contributes differently to the overall optical performance, enabling uniform optical effects across a wide wavelength range by combining the effects of individual layers with specific retardation properties
Solution Approach 2:
The invention uses composite material structures combining different liquid crystal materials with distinct optical properties. By selecting materials with specific retardation characteristics and combining them in a multilayer configuration, the system achieves broad wavelength uniformity that cannot be obtained with single-material plates
2Adaptability or versatility
If thicker phase difference plates are used to achieve uniform optical effects, then optical performance improves, but the device becomes heavier and larger
Solution Approach 1:
Instead of using a single thick plate, the system segments the optical function across multiple thinner layers. Each layer has optimized thickness and retardation properties that contribute to the overall uniform optical effect, achieving the desired performance with reduced total thickness and weight
Solution Approach 2:
The invention optimizes the retardation parameters of each layer to achieve uniform optical effects across wavelengths. By carefully selecting and tuning the retardation values of individual layers, the system achieves broad spectral uniformity with thinner overall structure, reducing weight while maintaining performance
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 enables phase difference plates to provide uniform optical effects in a wide wavelength range, allowing for the creation of thinner and lighter polarizing plates and image display devices with improved performance.
Implementation Method 1
a phase difference plate which is formed of a liquid crystal material and has a specific in-plane retardation
Data Source
AI summary
A phase difference plate includes a phase difference plate P1 and a phase difference plate P2. An in-plane slow axis of the phase difference plate P1 is orthogonal to an in-plane slow axis of the phase difference plate P2. The phase difference plate P2 includes a layer of a liquid crystal material oriented in an in-plane direction. An in-plane retardation ReP2(λ) at a wavelength A nm of the phase difference plate P2 satisfies the following formulae (e1) and (e2): {Re2 (400)−Re2(550)}/{Re2(550)−Re2(700)}<2.90 (e1), and Re2(400)/Re2(700)>1.13 (e2). An in-plane retardation ReP1(λ) of the phase difference plate P1 at a wavelength λ nm and the in-plane retardation ReP2(λ) of the phase difference plate P2 at the wavelength λ nm satisfy the following formulae (e4) and (e5): ReP1(550)>ReP2(550) (e4), and ReP1(400)/ReP1(700)<ReP2(400)/ReP2(700) (e5).