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Bidirectional temperature control optical switch material

An optical switch, liquid crystal cell technology, applied in optics, liquid crystal materials, nonlinear optics, etc.

Inactive Publication Date: 2008-04-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by changing the reflective bandwidth of PDLC to change its control of light reflection and transmission states, the characteristics of realizing bidirectional optical switches have not been reported yet.

Method used

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  • Bidirectional temperature control optical switch material
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  • Bidirectional temperature control optical switch material

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Embodiment Construction

[0016] Preparation of the liquid crystal cell: Spin-coat one side of the glass substrate with 3% polyvinyl alcohol aqueous solution, bake at 80° C. for 30 minutes, and then use flannelette to rub and align in one direction. Two oriented glass substrates were bonded together with a polyethylene spacer with a thickness of 100 μm along the orientation direction to make a plane-oriented liquid crystal cell.

[0017] Preparation of polymer-dispersed liquid crystal: the mixture ((-) 1,2-(two 4'-propyl-(4-cyclohexyl-4-benzoyl)) propylene glycol ester of mass ratio 18.7%, 1.4% ( -) 1,2-(di-4'-propyl-(4-cyclohexyl-4-benzoyl))-2-phenyl-ethylene glycol ester, 44.3% of 4-pentylbiphenylcyanide and 30.7 % of 4-heptylbiphenylcyanide, 4.0% of 1,4-(two 4'-(6-acryloyloxy-1-hexyloxy)-benzoyl)-2-cresyl ester polymerizable mono body, 0.9% benzoin isopropyl ether) was stirred at room temperature for 30 minutes in the dark.

[0018] The mixture was injected into the liquid crystal cell under the a...

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Abstract

The invention provides a bidirectional temperature control optical switch material, which can achieve the material control to the infrared spectral reflecting state by adjusting ambient temperature, and which belongs to the macromolecular dispersed liquid crystal material field. A mixture constituted by polymerizable monomers, a nematic liquid crystal, chiral compounds and an optical initiator has different switching state polymerized in different temperature. The invention has the advantages that: as the pitch of the inducement chiral nematic liquid crystal has the characteristics of increasing firstly and decreasing then with the raising of the temperature, the macromolecular dispersed liquid crystal material has the characteristics of bidirectional optical switch. The new character is hopeful to be used for the thermo-sensitive optical components control field.

Description

technical field [0001] The invention belongs to the field of polymer dispersed liquid crystal materials, and in particular provides a bidirectional temperature-controlled optical switch material, which is expected to be used in the field of temperature-sensitive optical element control. Background technique [0002] Polymer Dispersed Liquid Crystal (hereinafter referred to as PDLC) is a newly developed flat panel display device capable of displaying information. PDLC is a new type of light control film. It disperses small molecular liquid crystals in the polymer matrix in the form of droplets. Under the action of external fields (such as alternating electric fields, thermal fields, etc.), this film or liquid crystal cell can display Different optical states such as projection and scattering. Since the optical properties of PDLC can be specially influenced by the external field, and it has the advantages of high brightness, simple fabrication, and low fabrication cost, it ha...

Claims

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Application Information

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IPC IPC(8): G02F1/13G02F1/1337G02F1/1334C09K19/38
Inventor 杨槐原小涛曹晖黄维
Owner UNIV OF SCI & TECH BEIJING