Polymer Network LCD Response Speed
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Solution Overview
Problem
Current LCD devices face challenges in achieving high transmittance and high speed responsiveness while maintaining low drive voltage and preventing birefringence reduction, particularly in improving the fall time of liquid crystals.
Innovation Solution
The development of an LCD device with a polymer network having refractive anisotropy and alignment function, achieved by incorporating a specific content of polymerizable compounds in the liquid crystal composition, which forms a polymer network between transparent substrates with electrodes, and is polymerized under controlled temperature and voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a polymerizable compound is added to a nematic liquid crystal medium to achieve high speed response, then response speed is improved, but drive voltage increases and transmittance is reduced
Solution Approach 1:
The patent optimizes the concentration of polymerizable compound within a specific range (0.3% to 10% by mass) to achieve the desired balance between response speed and transmittance. By precisely controlling this parameter, the invention obtains a polymer network density that provides fast response while maintaining acceptable drive voltage and optical properties
Solution Approach 2:
The invention creates a composite liquid crystal system combining nematic liquid crystal molecules with a polymer network formed from polymerizable compounds. This composite structure provides both the fast response characteristics of the polymer network and the optical properties of the liquid crystal, achieving high speed response without complete loss of transmittance
2Speed
If a polymerizable compound is added to a nematic liquid crystal medium to achieve high speed response, then response speed is improved, but birefringence is reduced
Solution Approach 1:
The patent optimizes the concentration of polymerizable compound within a specific range (0.3% to 10% by mass) to achieve the desired balance between response speed and transmittance. By precisely controlling this parameter, the invention obtains a polymer network density that provides fast response while maintaining acceptable drive voltage and optical properties
Solution Approach 2:
The invention creates a composite liquid crystal system combining nematic liquid crystal molecules with a polymer network formed from polymerizable compounds. This composite structure provides both the fast response characteristics of the polymer network and the optical properties of the liquid crystal, achieving high speed response without complete loss of transmittance
3Speed
If the fall time of liquid crystal is improved by viscosity reduction, then fall speed is improved, but no effective technique exists for fall speed improvement other than viscosity reduction
Solution Approach 1:
The invention creates a composite liquid crystal system combining nematic liquid crystal molecules with a polymer network formed from polymerizable compounds. This composite structure provides both the fast response characteristics of the polymer network and the optical properties of the liquid crystal, achieving high speed response without complete loss of transmittance
Solution Approach 2:
The patent optimizes the concentration of polymerizable compound within a specific range (0.3% to 10% by mass) to achieve the desired balance between response speed and transmittance. By precisely controlling this parameter, the invention obtains a polymer network density that provides fast response while maintaining acceptable drive voltage and optical properties
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
This approach enhances the transmittance and speed responsiveness of LCD devices by improving the fall time of liquid crystals without increasing drive voltage and maintaining birefringence, resulting in improved performance.
Implementation Method 1
a fine polymer network has been formed in a ferroelectric liquid crystal
Implementation Method 2
effective birefringence becomes an order of magnitude or greater lower than the liquid crystal birefringence used
Implementation Method 3
in a ferroelectric liquid crystal (FLC) using a smectic liquid crystal, a high speed response of several hundred microseconds is capable
Data Source
AI summary
Provided is an LCD device having excellent high speed responsiveness. This LCD device contains a polymer or a copolymer in a liquid crystal composition sandwiched between two transparent substrates, at least one of which has an electrode, and the content of the polymer or the copolymer is 1% by mass or greater and less than 40% by mass of the total mass of the liquid crystal composition and the polymer or the copolymer. This LCD device can be applied to various operation modes such as TN, STN, ECB, VA, VA-TN, IPS, FFS, a π cell, OCB, and cholesteric liquid crystals.