Liquid crystal device comprising chiral nematic liquid crystal material in a helical arrangement

A technology of chiral nematic and liquid crystal devices, applied in nonlinear optics, optics, instruments, etc., can solve the problems of speed, contrast, controllability, and characteristic limitations of large-scale uniform arrangement

Inactive Publication Date: 2012-05-16
CAMBRIDGE ENTERPRISE LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are still limitations on characteristics such as, among others, speed, contrast, controllability, and large-scale uniform alignment of liquid crystal devices.

Method used

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  • Liquid crystal device comprising chiral nematic liquid crystal material in a helical arrangement
  • Liquid crystal device comprising chiral nematic liquid crystal material in a helical arrangement
  • Liquid crystal device comprising chiral nematic liquid crystal material in a helical arrangement

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[0119] By geometrically rotating the helical axis to align perpendicularly to the substrate, and in combination with applying an in-plane electric field, a polarization controller can be configured to rapidly tune as long as the pitch of the helical structure is much smaller than the wavelength of the incident radiation. The combination of in-plane electric field and upright helical geometry leads to rapid rotation of the optical axis out of plane due to dielectrically and / or flexoelectrically coupled helical deformation. In the field "off" state, chiral nematic devices are optically isotropic and transmit no light (opaque) between crossed polarizers. However, when the optical axis is tilted out of plane due to dielectric and / or flexoelectric coupling, birefringence is induced and the device becomes optically active between crossed polarizers. In a first example, such a controller may be suitable for telecommunication applications, whereby the wavelength of the incident radiat...

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Abstract

This invention generally relates to a liquid crystal device, and more particularly to such a device in the form of a liquid crystal cell such as for a display device, and further relates to a display device having the liquid crystal device, an optical waveguide device comprising the liquid crystal device, a Variable Optical Attenuator comprising the liquid crystal device, an optical switch comprising the liquid crystal device, a method of controlling transmission of polarised light, and to a further liquid crystal device. A liquid crystal device for controlling transmission of polarised light, comprising: chiral nematic liquid crystal having a helical arrangement of liquid crystal molecules in the absence of an electric field; and at least two electrodes for applying an electric field having a component normal to the helical axis of the chiral nematic liquid crystal, wherein the chiral nematic liquid crystal has negative dielectric anisotropy.

Description

technical field [0001] The present invention relates generally, inter alia, to a liquid crystal device for controlling the transmission of polarized light, a display device having several liquid crystal devices, an optical waveguide device comprising a liquid crystal device, a variable optical attenuator (VOA) comprising a liquid crystal device, a An optical switch or light-off device, a laser including a liquid crystal device, a method for controlling the output of light from a liquid crystal device, a method for controlling the transmission of polarized light, and another liquid crystal device. Background technique [0002] LCDs are now commercially used in large high-definition flat-panel television screens. Liquid crystal displays (LCDs), the current state of the art, involve high definition images with a specific refresh rate. The development of liquid crystal displays is well known and discussed in detail in many literature reports. On the engineering side, there hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/137G02F1/1343
CPCG02F1/13718G02F2001/13775G02F2001/134381G02F1/134363G02F1/134381G02F1/13775G02F1/1343G02F1/137
Inventor 崔秀石弗林·卡斯特尔斯斯蒂芬·莫里斯达明安·加德纳哈里·科尔斯
Owner CAMBRIDGE ENTERPRISE LTD
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