Liquid Crystal Composition for Polarized Sunglass Viewability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices like LCDs and OLEDs face issues with image brightness degradation when viewed through polarizing sunglasses due to the interaction between the polarizing layer and the polarizing axis, leading to potential image obstruction.
Innovation Solution
A liquid crystal composition comprising a multifunctional polymerizable liquid crystal compound and a non-liquid crystal compound with four or more functional groups, forming a layer with a surface hardness of 1H or more when cured, which is applied to the outermost surface of the display device to enhance optical characteristics and prevent brightness degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizing layer is added to control optical characteristics, then optical performance is improved, but brightness degradation occurs when viewed through polarizing sunglasses
Solution Approach 1:
A liquid crystal layer is introduced as an intermediary component between the display and the external environment. This layer has specific optical properties (retardation of 50-150 nm) that mediate the interaction between polarized light from the display and external polarized light, preventing harmful interference while maintaining display brightness and enabling viewability through polarizing sunglasses.
Solution Approach 2:
The patent changes the optical parameters of the display system by adding a liquid crystal layer with specific retardation values (50-150 nm). This parameter change modifies how polarized light interacts with the display, resolving the contradiction between maintaining brightness and enabling viewability through polarizing sunglasses by controlling the phase difference of light waves.
2Illumination intensity
If liquid crystal compounds with polymerizable groups are used to form oriented layers, then optical characteristics are improved, but surface hardness is insufficient
Solution Approach 1:
The patent uses a composite liquid crystal composition containing multiple components: liquid crystal compounds with polymerizable groups (for optical properties), crosslinking agents (for hardness), and photopolymerization initiators. This composite material combines the optical characteristics of liquid crystals with the mechanical strength of crosslinked polymers, achieving both soft and hard requirements simultaneously.
Solution Approach 2:
The liquid crystal layer exhibits local quality differentiation: the liquid crystal molecules provide optical anisotropy and retardation properties in the oriented state, while the crosslinked polymer network provides surface hardness. Different regions of the material structure serve different functions - the liquid crystal phase for optics and the polymerized network for mechanics.
3Strength
If crosslinking agents are added to increase surface hardness, then hardness is improved, but the composition complexity increases
Solution Approach 1:
The liquid crystal compounds serve multiple functions simultaneously: they provide the liquid crystal phase for optical anisotropy, contain polymerizable groups for forming the oriented layer, and can participate in crosslinking reactions. This multi-functionality reduces the need for separate additives and simplifies the overall composition despite achieving complex performance requirements.
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 liquid crystal layer achieves high surface hardness and excellent optical properties, preventing brightness degradation when viewed through polarizing sunglasses, and can be disposed on the outermost surface of display devices like LCDs or OLEDs.
Implementation Method 1
wherein the liquid crystal composition comprises a polymerizable liquid crystal material comprising a multifunctional polymerizable liquid crystal compound and a non-liquid crystal compound comprising at least four functional groups capable of reacting with the polymerizable liquid crystal compound
Data Source
AI summary
Provided are a liquid crystal composition and a method of manufacturing an optical film. The liquid crystal composition which may form a liquid crystal layer having excellent optical characteristics and a high surface hardness may be provided. The liquid crystal layer formed as described above may be used in various applications, and for example, may be disposed on the outermost surface of a display device, such as an LCD or an OLED, or at an outer side of a polarizing layer of the display in which the polarizing layer is disposed at a visible side, thereby serving as a liquid crystal layer which may solve a problem of degrading brightness occurring when an observer watches an image with polarizing sunglasses.