Light Absorption Anisotropic Layer for Front-Oblique Transmittance Control
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Solution Overview
Problem
Existing light absorption anisotropic layers struggle to achieve high transmittance in the front direction while effectively lowering transmittance in oblique directions, particularly in liquid crystal display devices, due to limitations in alignment and composition of dichroic substances.
Innovation Solution
A light absorption anisotropic layer with a dichroic substance aligned perpendicular to the film surface at a wavelength of 550 nm with an alignment degree of 0.95 or more, incorporating a liquid crystalline compound to enhance alignment and suppress precipitation, thereby increasing front transmittance and reducing oblique transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizing plate is used in an image display device, then light leakage is reduced and image quality is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the polarizing function from a traditional polarizing plate and transfers it to a polymer layer that is already present in the display structure. By forming a polymer alignment layer with inherent polarizing properties during the existing manufacturing process, the patent eliminates the need for a separate polarizing plate while maintaining the light control function.
Solution Approach 2:
The polymer alignment layer is designed to serve multiple functions: it acts as both the alignment layer for liquid crystal orientation and as the polarizing element. This multi-functional design allows the same layer to perform both liquid crystal alignment and light polarization, thereby reducing overall device complexity.
2Stability of the object's composition
If a polymer alignment layer is formed by a sliding plate method, then the alignment is improved, but the manufacturing precision and uniformity deteriorate due to solvent residue and uneven alignment
Solution Approach 1:
The patent replaces the mechanical sliding plate method with a magnetic field-based alignment approach. By applying a magnetic field during the polymer alignment layer formation, the patent achieves uniform molecular orientation without the mechanical contact and solvent residue issues that plague the sliding plate method.
Solution Approach 2:
The patent changes the alignment mechanism from mechanical sliding to magnetic field application. By controlling magnetic field strength and direction as parameters, the patent achieves precise and uniform alignment without the variability introduced by mechanical tolerances and solvent evaporation rates in the sliding plate method.
3Illumination intensity
If an inorganic light absorption layer is used, then light absorption is improved, but the harmful effect is that it absorbs UV light and generates heat
Solution Approach 1:
The patent changes the chemical composition parameters of the light absorption layer by incorporating specific organic compounds with appropriate absorption spectra. These compounds are selected to absorb primarily in the visible range while having minimal absorption in the UV range, thereby reducing heat generation from UV absorption.
Solution Approach 2:
The patent creates a composite light absorption layer combining organic light absorption compounds with a polymer matrix. This composite structure provides effective light absorption while the organic compounds can be tailored to avoid UV absorption, unlike traditional inorganic materials that inherently absorb UV and generate heat.
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 achieves high front transmittance and neutralized tint in the front direction, while significantly lowering oblique transmittance, by optimizing the alignment degree and composition of the dichroic substance within the anisotropic layer.
Implementation Method 1
a light absorption anisotropic layer including a liquid crystalline compound and at least one dichroic substance, in which the dichroic substance is aligned perpendicular to a film surface
Implementation Method 2
an alignment degree of the light absorption anisotropic layer at a wavelength of 550 nm satisfies 0.95 or more
Data Source
Figure 1
AI summary
An object of the present invention is to provide a light absorption anisotropic layer including a dichroic substance, in which a transmittance as viewed from a front direction is high and a transmittance as viewed from an oblique direction can be lowered, a laminate, an optical film, an image display device, and a backlight module. The light absorption anisotropic layer of an embodiment of the present invention is a light absorption anisotropic layer including a liquid crystalline compound and at least one dichroic substance, in which the dichroic substance is aligned perpendicular to the film surface, and an alignment degree of the light absorption anisotropic layer at a wavelength of 550 nm is 0.95 or more.