A method and system for aligning liquid crystals in micro-nano regions based on laser direct writing

A technology of laser direct writing and liquid crystal orientation, applied in the field of light modulation, can solve the problems affecting the orientation strength and uniformity of liquid crystal, and achieve the effect of simple operation

Active Publication Date: 2016-08-17
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, intrinsic defects and foreign matter contamination in the mechanical alignment method have always been the key factors affecting the alignment strength and uniformity of liquid crystals.

Method used

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  • A method and system for aligning liquid crystals in micro-nano regions based on laser direct writing
  • A method and system for aligning liquid crystals in micro-nano regions based on laser direct writing
  • A method and system for aligning liquid crystals in micro-nano regions based on laser direct writing

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Embodiment 1

[0042] For the present invention, a blue titanium sapphire femtosecond laser system with a wavelength of 800nm, a repetition rate of 1000 Hz, and a pulse width of 130 femtoseconds is used; a microscopic objective lens with a magnification of 40 and a numerical aperture of 0.6 is used for focusing; on a machine-controlled precision three-dimensional translation stage ; Process the SU8 photoresist with a one-dimensional grid structure; the specific optical path diagram is as follows Figure 4 shown. After processing, after developing and cleaning, the processed structure was characterized by scanning electron microscope as figure 1 As shown, it can be seen that a regular one-dimensional structure has been obtained. Then finely characterize the lodging polymer bands, such as figure 2 As shown, the fine stripe structure along the processing direction and perpendicular to the processing light wavevector direction can be seen. Inject the isotropic E7 liquid crystal into the grid...

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Abstract

The invention discloses a method and a system for aligning liquid crystals in micro-nano regions based on laser direct writing. The method uses a laser direct writing system to construct a micro-nano structure; the liquid crystal molecules in the micro-nano structure area realize self-orientation; the orientation of the liquid crystal originates from the fine structure on the sidewall of the polymer strip that constitutes the micro-nano structure; the micro-nano The size of the domains ranges from micrometers all the way to superdiffraction-limited nanometers. The method and system of the present invention are simple to operate, do not need to use mechanical or light-induced methods to form an orientation-inducing film on the substrate, and can realize self-orientation of liquid crystals in micro-nano regions, and the orientation direction can be regulated by micro-regions, which is beneficial to liquid crystal-based devices. The miniaturization and orientation of the complex three-dimensional liquid crystal structure can be widely popularized and applied.

Description

technical field [0001] The invention belongs to the field of light modulation technology, and specifically relates to the field of micro-nano processing based on laser direct writing and light modulation based on liquid crystals, in particular to a method and system for aligning liquid crystals in micro-nano regions based on laser direct writing. Background technique [0002] Liquid crystal display (LCD) technology is used worldwide in a variety of products ranging from watches to cellular phones to computers. The value associated with this industry is estimated to be in the billions of dollars per year. [0003] The orientation of liquid crystals has always been a key technology in liquid crystal-based displays and other device applications. An essential requirement for the manufacture of liquid crystal displays is the orientation of liquid crystal molecules (hereinafter referred to as "alignment layer") on the substrate surface (hereinafter referred to as "alignment surfa...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G02F1/1337
CPCB23K26/0006B23K26/0624B23K26/359B23K26/355B23K2101/36B23K2103/56B23K2103/42G02F1/133711G02F1/133788G02F2202/023G02F1/133776G02F1/133377G02F1/1341
Inventor张心正许京军李威伊瑞娜崔伟石彬王振华吴强孔勇发
OwnerNANKAI UNIV