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Method for erazing or writing cholesteryl phase liquid crystal stored information

A cholesteric liquid crystal and information storage technology, which is applied in the field of liquid crystal display, can solve the problems that it cannot be made into a flexible display screen, and the display has no memory.

Inactive Publication Date: 2006-05-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of polarizers and backlight plates in the display module, this display method has inevitable defects in terms of display angles, brightness, etc., and cannot be made into a flexible display screen.
In addition, the display itself has no memory, and the information on the screen will disappear after the power is turned off.

Method used

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  • Method for erazing or writing cholesteryl phase liquid crystal stored information
  • Method for erazing or writing cholesteryl phase liquid crystal stored information
  • Method for erazing or writing cholesteryl phase liquid crystal stored information

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Example 1: Electrical writing, thermal erasing

[0022] When no information is written, the liquid crystal is in a planar texture (the state after being poured into the liquid crystal cell), and a 12V voltage is applied to the area where information is to be written, so that the liquid crystal is arranged into a focal conic texture, see image 3 After being stored at room temperature for 100 hours, the transmittance only increased by 2.6%. It has a good memory and realizes the writing of information. The liquid crystal transforms into a planar texture and becomes transparent, see Figure 4 , to achieve the erasure of information. Transparent and non-bright states can be repeatedly achieved by increasing the temperature and applying an electric field. The contrast ratio in this example is about 5.5.

example 2

[0023] Example 2: Thermal writing, electrical erasing

[0024] When no information is written, apply a voltage of 12V to make the liquid crystal in the focal conic texture. In the area where the information is to be written, the temperature is raised to 60 degrees by heating the electric heating plate. After one minute, the area becomes transparent. The writing of information is realized; a voltage of 12V is applied to the area where the information is to be erased, and the liquid crystal transforms into a focal conic texture, which can be maintained for a long time, thereby realizing electrical erasing.

example 3

[0025] Example 3: Hot Write, Hot Erase 1

[0026] When no information is written, the liquid crystal is in a transparent state with a planar texture, and the area where the information is to be written is heated to 90 degrees with an electric heating plate. After cooling down, the area is in a focal conic texture, showing a state of light scattering, and has memory at room temperature , to achieve thermal writing; when erasing, heat the area to be erased to 60 degrees with an electric heating plate, and after one minute, the focal conic texture of light scattering transforms into a transparent planar texture, which has memory at room temperature and realizes thermal erase.

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Abstract

The present invention provides a method capable of thermally erasing information stored in the cholesteryl liquid crystal and writing information into said cholesteryl liquid crystal, belonging to the field of liquid crystal display technology. Said invention uses a chiral compound whose helical torque force can be continuously reduced with that the temperature is continuously risen, and mixes it with nematic phase liquid crystal so as to obtain the cholesteryl liquid crystal, in which the mass percent of the chiral compound is 0.1%-20%. Said invention also provides a concrete technological process to implement thermal erasion or writing-in of cholesteryl liquid crystal.

Description

technical field [0001] The invention belongs to the field of liquid crystal display and provides a method for erasing or writing information stored in cholesteric liquid crystals. Background technique [0002] Liquid crystal is an anisotropic fluid discovered in 1888 by the Austrian botanist Renitzer. [0003] Liquid crystals are generally partially ordered substances composed of rod-shaped molecules, disc-shaped molecules, and other molecules that do not have spherical symmetry. It is not only different from the isotropic liquid whose molecular arrangement is completely chaotic, but also different from the crystal whose molecular arrangement is completely ordered. The arrangement of molecules between crystals and liquids, as well as the special shape and properties of the molecules themselves, lead to the characteristics of liquid crystals that are between liquids and crystals, and even far more complex. [0004] However, the application of liquid crystals in display was ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13
Inventor 杨槐耿君董辰马征石琳高建勋曹晖王立萍
Owner UNIV OF SCI & TECH BEIJING
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