Optically Anisotropic Layer Smectic Phase Surface Condition
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Solution Overview
Problem
Existing optically anisotropic layers used in image display devices have suboptimal surface conditions and contrast ratios, which affect the performance of these devices.
Innovation Solution
An optically anisotropic layer is formed by immobilizing a polymerizable liquid crystal composition that includes a polymerizable rod-shaped liquid crystal compound and an additive, where the molecular lengths of the compound and the additive satisfy a specific relational expression, and the composition may contain a polymer derived from a fluoroaliphatic group-containing monomer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymerizable rod-shaped liquid crystal compound exhibiting a smectic phase is used to form an optically anisotropic layer, then optical compensation and viewing angle expansion are achieved, but the surface condition and image contrast are suboptimal
Solution Approach 1:
The patent applies parameter changes by introducing an additive with specific molecular length (0.3×A≤C≤0.6×A, where A is the molecular length of the liquid crystal compound) to modify the physical and chemical parameters of the composition. This additive concentration and molecular size optimization resolves the surface condition issue while preserving the smectic phase optical compensation performance
Solution Approach 2:
The patent creates a composite material system combining the polymerizable rod-shaped liquid crystal compound with a specifically designed additive having molecular length satisfying the relational expression. This composite approach maintains the optical anisotropy and smectic phase properties while improving surface morphology and image contrast through the synergistic effect of the additive
2Reliability
If a polymerizable rod-shaped liquid crystal compound exhibiting a smectic phase is used, then optical anisotropy and phase difference are achieved, but the contrast ratio of the image display device deteriorates
Solution Approach 1:
The patent modifies the compositional parameters by adding an additive with molecular length C satisfying 0.3×A≤C≤0.6×A. This parameter adjustment optimizes the interaction between the liquid crystal compound and the additive, improving the uniformity of the smectic phase structure and thereby enhancing the contrast ratio while preserving optical anisotropy
Solution Approach 2:
The additive acts as an intermediary substance that mediates between the liquid crystal compound molecules and the surrounding environment. By satisfying the specific molecular length relationship, the additive improves the packing density and structural uniformity of the smectic phase, which directly enhances the contrast ratio without compromising the optical anisotropy
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 proposed solution results in an optically anisotropic layer with improved surface conditions and enhanced contrast ratios for image display devices, achieving better optical performance.
Implementation Method 1
a polymerizable rod-shaped liquid crystal compound exhibiting a liquid crystal state of a smectic phase
Implementation Method 2
a layer interval B (Å) of the smectic phase of the optically anisotropic layer
Implementation Method 3
a molecular length C (Å) of the additive satisfy a relationship of Expression (1-1), 0.5×B≤C≤0.6×A
Data Source
AI summary
An optically anisotropic layer having an excellent surface condition, with which an image display device having an excellent contrast can be manufactured; and an optical film, a polarizing plate, and an image display device, each having the optically anisotropic layer. The optically anisotropic layer is obtained by immobilizing a polymerizable liquid crystal composition including a polymerizable rod-shaped liquid crystal compound exhibiting a liquid crystal state of a smectic phase and an additive in a liquid crystal state of a smectic phase, in which a molecular length A (Å) of the polymerizable rod-shaped liquid crystal compound, a layer interval B (Å) of the smectic phase of the optically anisotropic layer, and a molecular length C (Å) of the additive satisfy a relationship of Expression (1-1), 0.5×B≤C≤0.6×A . . . (1-1).