Optically Anisotropic Layer Composition for Oblique Light Leakage Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image display devices using optically anisotropic layers experience oblique light leakage when viewed from an oblique direction, which degrades image quality.
Innovation Solution
An optically anisotropic layer is formed by curing a polymerizable liquid crystal composition comprising a rod-like liquid crystal compound and a monofunctional compound, with specific atomic relationships and alignments to suppress oblique light leakage, using compounds with polymerizable groups and cyclic organic groups, and immobilizing the rod-like liquid crystal compound in a vertically aligned state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a polymerizable liquid crystal composition is used to form an optically anisotropic layer with vertically aligned rod-like liquid crystal compound, then the alignment state can be immobilized, but oblique light leakage occurs when viewed from an oblique direction
Solution Approach 1:
The patent changes the molecular structure parameters of the liquid crystal compound by introducing specific ring structures (three or more rings B1 including aromatic rings and alicyclic rings) positioned at specific locations (on bonds linking polymerizable groups). This structural modification alters the optical properties to suppress oblique light leakage while maintaining vertical alignment stability.
Solution Approach 2:
The patent creates a composite molecular structure combining rod-like liquid crystal compounds with multiple ring structures (aromatic rings and alicyclic rings) and polymerizable groups. This composite structure integrates both the alignment-stabilizing properties of rod-like molecules and the optical control properties of multi-ring structures, resolving the contradiction between alignment stability and oblique light leakage.
2Stability of the object's composition
If the rod-like liquid crystal compound is immobilized in a vertically aligned state, then the optical anisotropy is maintained, but image quality deteriorates due to oblique light leakage
Solution Approach 1:
The patent modifies molecular parameters by incorporating three or more rings B1 (aromatic and alicyclic rings) on specific bonds of the rod-like liquid crystal compound. This structural parameter change enables the material to maintain vertical alignment while simultaneously improving image quality by suppressing oblique light leakage through altered optical anisotropy characteristics.
Solution Approach 2:
The patent introduces specific ring structures (aromatic rings and alicyclic rings) at localized positions on the rod-like liquid crystal molecule (on bonds linking polymerizable groups). This local structural modification creates regions with different optical properties that collectively suppress oblique light leakage while preserving overall vertical alignment.
3Ease of manufacture
If a polymerizable compound with one or two polymerizable groups is used, then the composition can be polymerized to form the optically anisotropic layer, but oblique light leakage occurs
Solution Approach 1:
The patent designs a composite molecular structure that integrates polymerizable groups (for ease of manufacture and layer formation) with rod-like liquid crystal cores and multiple ring structures (for optical performance). This composite approach allows the material to be polymerized into an optically anisotropic layer while the specific molecular architecture suppresses oblique light leakage.
Solution Approach 2:
The patent changes the molecular architecture parameters by positioning three or more rings B1 on bonds that link polymerizable groups P1 and P2. This parameter modification maintains the polymerization capability (ease of manufacture) while the specific ring structure configuration alters optical properties to eliminate oblique light leakage.
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 effectively suppresses oblique light leakage, enhancing the contrast and image quality of image display devices by maintaining the alignment state of the rod-like liquid crystal compound without disturbance.
Implementation Method 1
the rod-like liquid crystal compound is immobilized in a state of being vertically aligned with respect to the main surface of an optically anisotropic layer
Implementation Method 2
an optically anisotropic layer obtained by curing a polymerizable liquid crystal composition including a rod-like liquid crystal compound
Implementation Method 3
a polymerizable liquid crystal composition including a rod-like liquid crystal compound and a monofunctional compound... by curing
Data Source
AI summary
Provided is an optically anisotropic layer with which an image display device having suppressed occurrence of oblique light leakage 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 curing a polymerizable liquid crystal composition including a predetermined rod-like liquid crystal compound and a predetermined monofunctional compound, and immobilizing an alignment state of the rod-like liquid crystal compound, in which a number a1 of atoms of the rod-like liquid crystal compound and a number a2 of atoms of the monofunctional compound satisfy a relationship of Expression (1): 0.2<a2/a1≤0.68, and the rod-like liquid crystal compound is immobilized in a state of being vertically aligned with respect to the main surface of the optically anisotropic layer.