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Blue-phase liquid crystal composite material and liquid crystal display comprising same

A technology of blue-phase liquid crystal and composite materials, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of electro-optical hysteresis, low driving voltage, and high driving voltage, and achieve the reduction of electro-optical hysteresis, low driving voltage, and low driving voltage. Effect of driving voltage

Inactive Publication Date: 2013-07-24
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of high driving voltage and electro-optic hysteresis of the blue phase liquid crystal composite material prepared by the prior art method, and provide a blue phase liquid crystal composite material with low driving voltage and almost no electro-optic hysteresis

Method used

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  • Blue-phase liquid crystal composite material and liquid crystal display comprising same
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Embodiment 1

[0077] This embodiment provides a blue-phase liquid crystal composite material, the composition of which is: 68.5% by weight of the parent blue-phase liquid crystal; 30.0% by weight of a photopolymerizable monomer; 1.0% by weight of a photoinitiator; 0.5% by weight % of inorganic nanoparticles ZnS.

[0078] The above-mentioned blue phase liquid crystal composite material is prepared by the following method:

[0079] Step 1, preparation of inorganic nanoparticles ZnS

[0080] Add surfactant Triton X-100 (TritonX-100) into cyclohexane; add thioacetamide solution into cyclohexane dissolved in surfactant, slowly add positive butanol until the solution is clarified, that is, a thioacetamide microemulsion is formed; measure zinc acetate solution equivalent to thioacetamide, and prepare a zinc acetate microemulsion using the same method as that used to prepare the thioacetamide microemulsion.

[0081] The prepared thioacetamide microemulsion and zinc acetate microemulsion were mixe...

Embodiment 2

[0118] This embodiment provides a blue-phase liquid crystal composite material, the composition of which is calculated by mass percentage: 88.95wt% of the parent blue-phase liquid crystal; 10.0wt% of the photopolymerizable monomer; 1.0% of the photoinitiator; 0.05wt% of the inorganic Nanoparticle BaTiO 3 .

[0119] Step 1, preparation of inorganic nanoparticles BaTiO 3

[0120] By grinding large particles of BaTiO 3 powder (approximately 1 micron in diameter) to produce ferroelectric nanoparticles BaTiO 3 , BaTiO 3 The particles are mixed with oleic acid (surfactant) and heptane (carrier liquid) at a weight ratio of 1:2:10, and after ultrasonic dispersion, they are ground for 15 hours by a planetary high-energy ball mill. The ball-milled dispersion was transferred to a beaker, and left to stand for 3 days, and then filtered through a screen window to remove large-size particles, and the obtained dispersion was a dispersion containing ferroelectric nanoparticles with a spe...

Embodiment 3

[0138] This embodiment provides a blue-phase liquid crystal composite material, the composition of which is: 68.0wt% of the parent blue-phase liquid crystal; 27.0wt% of the photopolymerizable monomer; 3.0wt% of the photoinitiator; 2.0wt% Inorganic ZnO nanoparticles.

[0139] The above-mentioned blue phase liquid crystal composite material is prepared by the following method:

[0140] Step 1, preparation of inorganic nanoparticles ZnO

[0141] The polytetrafluoroethylene lining of the hydrothermal reactor was peeled and weighed, and the oleic acid was sucked into the lining with a dropper. Weigh 0.353g (1.25mmol) oleic acid into the lining by this method, put it into a 50mL hydrothermal reaction kettle, then dissolve sodium hydroxide and zinc acetate dihydrate (ratio of substance 2:1) in water, Add it into the hydrothermal reaction kettle, and keep stirring, then seal the kettle, put it in a dry box, raise the temperature to 130°C, and react for 4 hours; The solid is washed ...

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Abstract

The invention provides a blue-phase liquid crystal composite material and a liquid crystal display comprising the same, belonging to the technical field of liquid crystal materials, and aiming at solving the problems of high drive voltage and electrooptic hysteresis of an existing blue-phase liquid crystal material and the liquid crystal display comprising the same. The blue-phase liquid crystal composite material is formed by raw components through photopolymerization, wherein the raw components comprise a parent blue-phase liquid crystal, an optical polymerizable monomer, a photoinitiator and an inorganic nanoparticle. A preparation system of the blue-phase liquid crystal composite material is stable, is simple in process, low in viscosity, low in drive voltage and high in electric field response speed, and has no electrooptic hysteresis.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a blue phase liquid crystal composite material and a liquid crystal display containing the material. Background technique [0002] Blue phases (Liquid crystalline Blue Phases, BPs) are macroscopically a special phase state between the isotropic state and the cholesteric phase, and often appear in high-chiral liquid crystal systems. Microscopically, the blue phase is a lattice defect phase without birefringence, and its lattice parameter size is on the order of the wavelength of visible light (hundreds of nanometers). The blue phase can be divided into three sub-phases from the crystal structure, which are named blue phase I (BPI), blue phase II (BPII) and blue phase III (BPIII), and the corresponding lattice structures are body-centered cubic structure, Simple cubic structure and amorphous state. Blue-phase liquid crystal materials are considered to...

Claims

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Application Information

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IPC IPC(8): C09K19/58C09K19/20C09K19/34G02F1/1333G02F1/137
CPCC09K19/0275C09K19/2021C09K19/54C09K19/588C09K2019/0437C09K2019/3408G02F1/133365G02F1/137G02F1/13793
Inventor 杨槐王玲何万里
Owner BOE TECH GRP CO LTD
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