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Bistble reflection display device

A bistable and reflective technology, applied in static indicators, nonlinear optics, instruments, etc., can solve problems such as device monostable

Inactive Publication Date: 2003-07-09
NEMOPTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Most devices proposed or made in the past are monostable

Method used

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  • Bistble reflection display device
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Experimental program
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Effect test

Embodiment approach

[0101] A non-limiting embodiment of the invention is presented herein. To demonstrate its advantages, the operation of bistable liquid crystal tubes has been compared in terms of anchor breaking and in-transit display optimization.

[0102] In both cases, the anchoring of one surface of the substrates 20 and 40 was very strong at a tilt of 30° (wiping SiO at 85°). On the other surface, weaker planar anchoring was obtained by evaporating SiO at 75°. The nematic liquid crystal of 5CB commercially available from Merck can be chiralized by adding S811 chiral dopant (Merck). These two kinds of liquid crystal tubes can make the self-helical pitch of the mixture P 0 =4·d (where d=1.5 μm for the transmissive liquid crystal tube of the prior art, and d=0.85 μm for the reflective liquid crystal tube of the present invention).

[0103] The static thresholds for anchor breaking measured on the two LC tube weakly anchored plates were comparable (E c =7V / μm). These two devices can use ...

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Abstract

The present invention relates to a reflective liquid crystal display device comprising a liquid crystal material (30) contained between two parallel substrates (20, 40) provided with aligning means on the electrodes to orient the liquid crystal and enable at least two alternative distinct textures that are stable or metastable in the absence of a field to be obtained, means for applying electrical signals to the liquid crystal to perform switching by enabling anchoring on at least one of the two substrates to be broken, a polarizer (10) associated with the front face of the device and oriented at an angle lying in the range 15° to 75° relative to the director of the liquid crystal on the front face of the device, and a specular or diffusing reflective element (50) placed at the rear face of the liquid crystal.

Description

technical field [0001] The present invention relates to a liquid crystal display device. Background technique [0002] According to the physical characteristics of the liquid crystal used, liquid crystal devices can be classified into nematic, cholesteric, smectic, ferroelectric, and the like. Among them, the nematic display device is the preferred mode of the present invention. In the nematic display device, the nematic liquid crystal can be made chiral or achiral by doping. The resulting structure itself is uniform or slightly twisted with a twist pitch greater than a few micrometers. Liquid crystals near the surface are determined in orientation and anchoring by alignment layers or substrate processing. [0003] Most of the devices proposed or fabricated in the past are monostable. In the absence of an electric field, only one structure can be obtained in the device. This structure corresponds to the absolute minimum of the total energy of the liquid crystal tube. Wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/13363G02F1/1337G02F1/137G02F1/139
CPCG02F1/1337G02F1/1397G02F1/1391G02F2001/13787G02F2203/02G02F1/1393G02F1/13787G02F1/133
Inventor I·N·多佐夫P·R·马蒂诺-拉加德D·N·斯托埃内斯库
Owner NEMOPTIC