Liquid Crystal Display Antioxidant Stabilization
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Solution Overview
Problem
Liquid crystal display devices face issues with afterimage defects and reduced voltage holding ratios due to the oxidation of alkenyl and alkoxy liquid crystals during manufacturing and operation, which are not effectively addressed by existing technologies.
Innovation Solution
Incorporating an antioxidant component in the liquid crystal composition, including compounds such as alkylated monophenols and tocopherols, to prevent oxidation of alkenyl and alkoxy liquid crystals, along with reactive mesogens that form alignment layers upon UV irradiation, thereby stabilizing the liquid crystal molecules and improving the voltage holding ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reactive mesogens are cured by light irradiation to align liquid crystal molecules, then the liquid crystal molecules can be aligned in a predetermined direction achieving wide viewing angle and high contrast ratio, but some reactive mesogens remain uncured causing afterimage defects
Solution Approach 1:
The patent introduces a multi-stage curing process with controlled light irradiation parameters. The first light irradiation step uses specific intensity and duration to cure reactive mesogens sufficiently for alignment, while the second light irradiation step with different parameters ensures complete curing. This parameter optimization resolves the contradiction by achieving both precise alignment and complete curing without afterimage defects.
Solution Approach 2:
The patent applies a preliminary alignment treatment before final curing. The first light irradiation step performs preliminary curing that establishes molecular alignment, then the second step completes the curing process. This preliminary action ensures that alignment is achieved before the remaining reactive mesogens are fully cured, preventing afterimage defects while maintaining alignment precision.
2Ease of operation
If alkenyl and alkoxy liquid crystals are used to achieve desired display properties, then the liquid crystal display can function properly, but oxidation occurs during manufacturing and operation reducing voltage holding ratio
Solution Approach 1:
The patent introduces antioxidants as intermediary substances that prevent oxidation of alkenyl and alkoxy liquid crystals. These antioxidants act as mediators between the liquid crystal molecules and oxidative environment, sacrificing themselves to protect the functional liquid crystal components. This resolves the contradiction by maintaining display performance while preventing oxidation-induced voltage holding ratio reduction.
Solution Approach 2:
The patent adds antioxidants in advance to the liquid crystal composition before manufacturing and operation. This beforehand cushioning creates a protective environment that prevents oxidation from occurring in the first place. The antioxidants are pre-positioned to counteract oxidative effects during subsequent manufacturing processes and device operation, maintaining both display performance and voltage holding ratio.
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 use of antioxidants significantly reduces the formation of defects like afterimages and maintains a high voltage holding ratio, even under exposure to light, heat, and electrical fields, enhancing the overall quality and reliability of the liquid crystal display.
Implementation Method 1
the oxidation of alkenyl and alkoxy liquid crystals during manufacturing and operation
Implementation Method 2
reactive mesogens that form alignment layers upon UV irradiation
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, and a liquid crystal layer between the first and second substrates. The liquid crystal layer includes a liquid crystal composition including an alkenyl liquid crystal and an antioxidant component including at least one selected from an antioxidant and a derivative thereof. In an embodiment, the antioxidant component is present in an amount of greater than 0 ppm and equal to or less than about 10,000 ppm relative to the total weight of the liquid crystal composition.