Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Double-frequency liquid crystal material having low critical frequency

A dual-frequency liquid crystal, low critical technology, applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of dielectric loss, affecting the service life of liquid crystal devices, and unfavorable dual-frequency liquid crystals for portable devices. Effect of working voltage

Active Publication Date: 2014-11-05
PEKING UNIV
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the critical frequency of dual-frequency liquid crystal materials is relatively high (above 50kHz), and dual-frequency liquid crystal materials will have dielectric loss at high frequencies, which will affect the service life of liquid crystal devices.
Moreover, the high critical frequency causes the drive equipment that provides high frequency to be too bulky, which is not conducive to the use of dual-frequency LCDs on portable devices.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Double-frequency liquid crystal material having low critical frequency
  • Double-frequency liquid crystal material having low critical frequency
  • Double-frequency liquid crystal material having low critical frequency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The dual-frequency liquid crystal material consists of 21.63% component A (A-1: R 1 =C 3 h 7 , R 2 =OC 2 h 5 12.38%; A-2: R 1 =C 3 h 7 , R2 =OCH 3 9.25%), 21.78% of component B (B-1: R 1 =C 3 h 7 , R 2 =OC 2 h 5 8.52%; B-2: R 1 =C 3 h 7 , R 2 =OCH 3 9.38%; B-3: R 1 =C 4 h 9 , R 2 =OCH 3 3.88%), 19.84% of component C (C-1: R 1 =C 3 h 7 , R 2 =OCH 3 12.01%; C-2: R 1 =C 3 h 7 , R 2 =OC 2 h 5 accounted for 7.83%), 9.42% of component D (D-1: R 1 =C 4 h 9 , R 2 =OC 2 h 5 4.85%; D-2: R 1 =C 5 h 11 , R 2 =OC 2 h 5 Accounting for 4.57%), 11.45% of component E (E: R 1 =C 5 h 11 accounted for 11.45%), 8.38% of component F (F-1: R 1 =C 3 h 7 4.26%; F-2: R 1 =C 5 h 11 4.12%), 7.50% of component G (G-1: R 1 =C 3 h 7 3.55%; G-2: R 1 =C 5 h 11 Accounting for 3.95%) formed by melt mixing. The molecular structure formula and ratio of each component compound are shown in Table 1 below.

[0040] Table 1 Molecular structural form...

Embodiment 2

[0046] The dual-frequency liquid crystal material consists of 21.80% component A (A-1: R 1 =C 3 h 7 , R 2 =OC 2 h 5 11.55%; A-2: R 1 =C 3 h 7 , R 2 =OCH 3 accounted for 10.25%), 20.52% of component B (B-1: R 1 =C 3 h 7 , R 2 =OC 2 h 5 10.43%; B-2: R 1 =C 3 h 7 , R 2 =OCH 3 accounted for 10.09%), 23.36% of component C (C-1: R 1 =C 3 h 7 , R 2 =OCH 3 13.54%; C-2: R 1 =C 3 h 7 , R 2 =OC 2 h 5 9.82%), 11.46% of component D (D-1: R 1 =C 3 h 7 , R 2 =OC 2 h 5 5.34%; D-2: R 1 =C 5 h 11 , R 2 =OC 2 h 5 accounted for 6.12%), 11.36% of component E (E-1: R 1 =C 5 h 11 5.88%, E-2: R 1 =C 3 h 7 accounted for 5.48%), 6.37% of component F (F-1: R 1 =C 3 h 7 3.15%; F-2: R 1 =C 5 h 11 accounted for 3.22%), 5.13% of component G (G-1: R 1 =C 3 h 7 2.17%; G-2: R 1 =C 5 h 11 Accounting for 2.96%) formed by melt mixing. The molecular structure formula and ratio of each component compound are shown in Table 2 below.

[0047] Table 2 Molecu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Crystallization pointaaaaaaaaaa
Viscosityaaaaaaaaaa
Crystallization pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a double-frequency liquid crystal material having low critical frequency. The double-frequency liquid crystal material comprises 20.0-25.0% of an ingredient A, 20.0-25.0% of an ingredient B, 17.5-22.5% of an ingredient C, 7.5-12.5% of an ingredient D, 7.5-12.5% of an ingredient E, 5.0-10.0% of an ingredient F and 5.0-10.0% of an ingredient G, and the above material are melt and mixed. The ingredient A comprises a series of derivatives having cyclohexylfluorodiphenylacetylene skeleton structures, the ingredient B comprises a series of derivatives having fluorodiphenylacetylene skeleton structures, the ingredient C comprises a series of derivatives having cyclohexylbenzene ring skeleton structures, the ingredient D comprises a series of derivatives having diphenylacetylene skeleton structures, the ingredient E comprises a series of derivatives having three-ring monoester lateral fluoro-group-containing cyano-terminated skeleton structures, and the ingredient F comprises a series of derivatives having three-ring diester lateral dicyano-containing skeleton structures. The double-frequency liquid crystal material has low critical frequency, wide liquid crystalline phase temperature and low viscosity and can be used for preparation of a double-frequency driven liquid crystal device having low work voltage and fast response rate.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a dual-frequency liquid crystal material with low critical frequency and its application. Background technique [0002] The rod-like molecular shape of the liquid crystal determines that the liquid crystal has optical and electrical anisotropy. The main feature of the dual-frequency liquid crystal is that the dielectric constant decreases with the increase of the AC frequency, and the dielectric constant decreases with the increase of the AC frequency. The anisotropy is greater than zero (equivalent to positive liquid crystal), and the dielectric anisotropy is less than zero (equivalent to negative liquid crystal) at high AC frequency (greater than 100kHz), so that the dielectric anisotropy of dual-frequency liquid crystal is zero The frequency is called the critical frequency. Therefore, this type of liquid crystal material has strong polarity both ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K19/46G02F1/1333
Inventor 杨槐李辰悦张兰英陈寅杰王萌王慧慧
Owner PEKING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com