Phase Difference Plate with Reverse Wavelength Dispersion Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing phase difference plates used in display devices face difficulties in precisely controlling reverse wavelength dispersion without compromising optical and mechanical performance.
Innovation Solution
A phase difference plate is created using a polymerizable liquid crystal compound with specific mesogens, where the main chain and side chain mesogens are oriented differently, forming an optically anisotropic layer with controlled reverse wavelength dispersion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional phase difference plate configurations are used, then basic optical performance is maintained, but reverse wavelength dispersion cannot be precisely controlled
Solution Approach 1:
The liquid crystal molecule is divided into distinct functional segments: a main chain mesogen containing polymerizable groups and a side chain mesogen with different optical properties. This segmentation allows independent optimization of each segment's contribution to reverse wavelength dispersion, enabling precise control over the overall dispersion characteristics while maintaining manageable molecular complexity
Solution Approach 2:
Different regions of the molecule are assigned specific optical properties: the main chain mesogen provides one set of birefringence characteristics while the side chain mesogen provides another. By controlling the orientation and composition of these local regions, the patent achieves precise control over reverse wavelength dispersion without requiring complex overall molecular structures
2Reliability
If reverse wavelength dispersion is adjusted to improve display performance, then optical performance is enhanced, but mechanical performance may be compromised
Solution Approach 1:
The patent employs a composite molecular structure combining main chain and side chain mesogens in a single liquid crystal molecule. This composite approach allows the material to simultaneously achieve desired optical properties (reverse wavelength dispersion) and mechanical properties (strength and stability) by selecting appropriate mesogen combinations and ratios, avoiding the need to compromise mechanical performance for optical enhancement
3Manufacturing precision
If single mesogen orientation is used, then molecular structure is simple, but reverse wavelength dispersion control is insufficient
Solution Approach 1:
The patent utilizes the ability of liquid crystal molecules to undergo phase transitions and reorientation under external fields. By applying electric fields or other stimuli, the orientation of main chain and side chain mesogens can be dynamically adjusted, enabling real-time control over reverse wavelength dispersion characteristics without permanently complexifying the molecular structure
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
This solution allows for precise control of reverse wavelength dispersion, enhancing the display performance and cost-effectiveness of the phase difference plate and the associated display devices.
Implementation Method 1
the main chain mesogen and the side chain mesogen of the polymerizable liquid crystal compound with reverse wavelength dispersion are oriented in different directions in the optically anisotropic layer, whereby a birefringence Δn of the optically anisotropic layer has reverse wavelength dispersion property
Implementation Method 2
an optically anisotropic layer obtained by curing a composition (A) containing a polymerizable liquid crystal compound with reverse wavelength dispersion and a polymerizable monomer
Data Source
AI summary
A phase difference plate including an optically anisotropic layer obtained by curing a composition (A) containing a polymerizable liquid crystal compound with reverse wavelength dispersion and a polymerizable monomer, wherein the polymerizable liquid crystal compound with reverse wavelength dispersion has a main chain mesogen and a side chain mesogen bonded to the main chain mesogen in the molecule thereof; the main chain mesogen and the side chain mesogen are oriented in different directions, whereby a birefringence Δn of the optically anisotropic layer has reverse wavelength dispersion property; and retardations of a layer obtained by curing a composition (A0) in which the polymerizable monomer in the composition (A) is replaced by the polymerizable liquid crystal compound with reverse wavelength dispersion and retardations of the optically anisotropic layer satisfy specific relationship; and a circularly polarizing plate and a display device including the same.