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Optical rewritable device

A technology for writing devices and light, applied in optics, nonlinear optics, instruments, etc., to achieve high security effects

Inactive Publication Date: 2012-05-16
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, if the requirements of the above-mentioned specific wavelength and polarization direction are known, the phenomenon that ORW tags are easy to be tampered with and counterfeited will be unavoidable

Method used

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0036] Figure 1a A cross-sectional schematic showing an optically rewritable label directly using the top polarizer as a substrate. Different from the internal structure of traditional LCD, no plastic substrate is used in the ORW label, and both the top layer 101 and the bottom layer 104 are polarizers. The lower part of the top substrate 101 is a first alignment layer 102 , and the first alignment layer 102 is usually a layer of azo dye coated on the lower part of the top substrate 101 . The azo dye will form a certain alignment direction after being irradiated by polarized UV light, and the polarization direction of the irradiated light will change, and the alignment direction of the azo dye will also change accordingly. In the conventional technolo...

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PUM

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Abstract

The invention discloses an optical rewritable device which comprises a top polaroid, a first alignment layer, liquid crystals, a second alignment layer and a bottom polaroid, wherein the first alignment layer, liquid crystals, second alignment layer and bottom polaroid are positioned under the top polaroid; the second alignment layer comprises a first region and a second region; and the alignment direction of the first region is different from that of the second region. The device disclosed by the invention has the advantage of higher security.

Description

technical field [0001] The invention relates to the field of optical rewritable (ORW), in particular to an optical rewritable device. Background technique [0002] Recently, technologies related to optically rewritable devices, such as optically rewritable paper, have been greatly developed. Users can use the light emitted by an external drive device to erase and write information on optically rewritable (ORW, optically rewritable) paper. [0003] Similar to electronic paper (E-Paper), ORW paper not only brings readers an experience similar to paper reading, but also has the ability to dynamically update information. In addition, since ORW paper does not include any electronic equipment, it is more flexible and less costly, and has greater commercial potential than E-Paper. For example, ORW paper can be easily used as a product label to display valid information (such as product price, quantity, production date, etc.) for user reference. For retailers who frequently chang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/1333
Inventor 赖胜李明
Owner SIEMENS AG