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Dynamic liquid crystal gel holograms

A hologram and gel technology, applied in the field of dynamic holograms, can solve problems such as inability to provide flexibility and complicated manufacturing

Inactive Publication Date: 2007-10-31
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, these materials are complex to fabricate and do not offer the flexibility for in situ control of liquid crystal domain size, shape, density, or ordering

Method used

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  • Dynamic liquid crystal gel holograms
  • Dynamic liquid crystal gel holograms
  • Dynamic liquid crystal gel holograms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0070] DESCRIPTION OF THE PREFERRED EMBODIMENT

[0071] Fig. 1 shows a general arrangement diagram of a cell 2 used in the holographic liquid crystal element of the present invention. The element comprises a transparent cathode 4 and a transparent anode 6 electrically connected to a power source 8 for generating an electric field between them. The electrodes are housed by transparent substrates 5 and 7 and comprise an LC gel phase or LC pre-gel mixture 10 . Macroscopic orientation within the pregel mixture is induced by orientation layers 1 and 3. These layers are usually made of polymers such as polyimides for planar oriented uniaxial rubbing. Each orientation layer can be chosen to be a surfactant in order to induce a perpendicular orientation of the molecules with respect to the surface. Various applicable layers are known to those skilled in the art.

[0072] Figure 2 illustrates a simplified layout for forming a holographic element. Here, in a first step, the beam fr...

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PUM

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Abstract

A switchable dynamic hologram (2) is formed in anisotropic liquid crystal (LC) gel materials (10) wherein anisotropy results from macroscopic alignment of the LC. By applying an electric field (8), the orientation of part of the liquid crystals can be altered and the hologram can be turned on and off. Using LC gels allows for holographic elements with no diffraction in the voltage off state (V = 0) so that the hologram appears only during application of an electric field (V 0). Also, the anisotropic LC gels maintain polarization dependence. The dynamic holograms are suitable in e.g. dynamic holographic optical components whereby an optical function can be included / excluded in a beam path without introducing or removing elements.

Description

technical field [0001] The present invention relates to dynamic holograms formed in liquid crystal materials. By applying an electric field, the orientation of parts of the liquid crystal can be changed and the hologram can be switched on and off. The invention is suitable, for example, for dynamic holographic optical elements, whereby optical functions can be included / excluded in the optical path without introducing or removing elements. Background of the invention [0002] Conventional holograms known in the literature are static holograms. Once a hologram is formed, its optical properties cannot be changed. Electrically controllable holograms have been made by combining the advantages of liquid crystals with volume holographic gratings. First, a holographic transmission grating is formed by exposing a photopolymerizable material using conventional two-beam equipment for forming an interference pattern within the material. After exposure, the material is processed to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/02G03H1/22G02F1/1334G02F1/29
CPCC09K19/2007G03H1/22C09K19/12C09K19/3477G03H2001/026G03H1/02C09K19/3068G02B5/1876G03H2260/12G03H2260/33C09K2019/0448G02B5/32G02F1/292G02F1/13342
Inventor R·A·M·希克默特
Owner KONINK PHILIPS ELECTRONICS NV