Polarizing Plate with Anisotropic Layers for LCD Thinning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices face challenges in achieving thinness and improved display performance, including prevention of light leakage, color variation, and display unevenness, especially under moist and hot environments, due to deformation of polarizer components and changes in optical properties.
Innovation Solution
A polarizing plate comprising optically anisotropic layers with specific retardation relationships and thicknesses, including a first and second optically anisotropic layer with liquid crystal compounds, is used to enhance the display performance by maintaining optical properties and preventing deformation under varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the liquid crystal display device is made thinner, then the device thickness is reduced, but the display performance deteriorates due to deformation of polarizer components under moist and hot environments
Solution Approach 1:
The patent changes the retardation parameters of the optically anisotropic layer by selecting specific liquid crystal compounds with precise retardation values (Re: 10-150 nm, Rth: -50 to -150 nm) and controlling layer thickness (5-20 μm). This parameter optimization allows the device to be made thinner while maintaining display performance stability under moist and hot environments, as the specific retardation characteristics prevent deformation-induced optical property changes.
Solution Approach 2:
The patent uses composite material structure combining a polarizer with specific optically anisotropic layers containing liquid crystal compounds. The composite design integrates multiple functional layers with complementary properties: the polarizer provides polarization function while the optically anisotropic layers with specific retardation characteristics provide optical compensation and environmental stability, enabling both thinness and reliable display performance.
2Length of stationary object
If the optically anisotropic layer thickness is reduced, then the device is thinned, but the optical properties change under environmental conditions causing display unevenness
Solution Approach 1:
The patent optimizes the retardation parameters of the optically anisotropic layer by selecting liquid crystal compounds with specific retardation values (Re: 10-150 nm, Rth: -50 to -150 nm) and controlling layer thickness (5-20 μm). This parameter optimization allows the layer to be made thinner while maintaining optical property consistency, as the specific retardation characteristics compensate for environmental variations and prevent display unevenness.
3Manufacturing precision
If liquid crystal compound alignment is improved, then tint differences are reduced, but light leakage increases when viewing from oblique directions
Solution Approach 1:
The patent changes the optical parameters of the optically anisotropic layer by selecting liquid crystal compounds with specific retardation characteristics (Re: 10-150 nm, Rth: -50 to -150 nm). These parameter adjustments optimize the balance between tint uniformity and light leakage prevention, allowing improved alignment while controlling oblique viewing light leakage through the specific optical properties of the liquid crystal compound.
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 both thinning of the liquid crystal display device and improved display performance by preventing light leakage, color variation, and display unevenness, even under moist and hot environments, by maintaining the optical properties of the polarizing plate.
Implementation Method 1
a first optically anisotropic layer including a liquid crystal compound X; and a second optically anisotropic layer including a liquid crystal compound Y, wherein the thickness of the first optically anisotropic layer is 10 μm or less, the first optically anisotropic layer satisfies the following expressions (1-1) and (1-2): 95 nm≤Re(550)≤155 nm; and 45 nm≤Rth(550)≤80 nm
Data Source
AI summary
The present invention provides a polarizing plate where, when the polarizing plate is applied to a liquid crystal display device, both thinning of the device and improvement in display performance such as prevention of light leakage, prevention of color variation, and suppression of display unevenness under a moist and hot environment can be achieved. The polarizing plate has, in this order, a first polarizer protective layer, a first polarizer, a first optically anisotropic layer including a liquid crystal compound X, and a second optically anisotropic layer including a liquid crystal compound Y, in which the thickness of the first optically anisotropic layer is 10 μm or less, the first optically anisotropic layer has predetermined Re(550) and Rth(550), the thickness of the second optically anisotropic layer is 10 μm or less, and has predetermined Re(550) and Rth(550), and the polarizing plate has a thickness of is 100 μm or less.