Patterned liquid crystal light-orientation device and method based on orthogonal circularly polarized light interference

Abstract

The invention discloses a patterned liquid crystal light-orientation device and method based on orthogonal circularly polarized light interference, and the device comprises an illumination assembly, a pattern miniature assembly, a focal length servo assembly, a motion control part, a polarization pattern generation assembly, a light path calibration monitoring assembly and a phase compensation assembly. The phase compensation assembly directly compensates an optical path in the polarization pattern generation assembly. The polarization information of the circularly polarized light is controlled by using the phase difference generated by the phase-type spatial light modulator LCOS, so that the polarization direction of the linearly polarized light formed by circularly polarized light interference is accurate and controllable, and the directional arrangement of the liquid crystal can be realized by combining the property that the photo-alignment material is sensitive to the polarization direction of the linearly polarized light.

Description

technical field [0001] The invention relates to the field of alignment control of liquid crystals, in particular to a patterned liquid crystal light alignment device and method based on interference of orthogonal circularly polarized light. Background technique [0002] Liquid crystal is a functional material with both liquid and crystal properties, and is widely used in various liquid crystal displays. However, the arrangement of liquid crystal molecules is not as firm as the crystal structure. Under external effects (such as electric field, magnetic field, stress), the liquid crystal molecules will change from the initial arrangement to other arrangements, resulting in changes in their optical properties. This is liquid crystal The basis of the display. The orderly arrangement of liquid crystals is achieved by providing sufficient directional anchoring force through the alignment film, and the liquid crystal alignment technology is a technology developed to achieve this g...

AI Technical Summary

Problems solved by technology

One type requires masks, including contact mask exposure, projection mask exposure and projection dynamic mask exposure. Among them, contact and projection mask exposure need to make corresponding masks for different patterns. The disadvantages of high production cost and low efficiency, while the current projected dynamic mask exposure (DMD-based dynamic mask exposure) cannot achieve different liquid crystal orientation patterns in different selected areas under a single exposure, and requires multiple exposures, which is also efficient. The other type is maskless and uses holographic interference, but it can only generate one-dimensional or two-dimensional periodic liquid crystal alignment patterns with a single orientation, and it is difficult to prepare complex patterns.

[0004] Specifically, the application number is: 201210225093.9, and the patent name is: A method and device for realizing arbitrary orientation control of liquid crystals by digital control micromirror array lithography. The deflection of the medium and micro mirrors is used to realize the dynamic mask function. Although this method can realize the orientation arrangement of the selected area of ​​the liquid crystal without changing the mask, it cannot realize the recording of the arbitrary orientation arrangement pattern of the selected area of ​​the liquid crystal in a single photo-controlled alignment process. The optical control orientation operation can only realize the recording of polarization patterns in a single direction. To realize the recording of polarization patterns in different directions in different selected areas, it is necessary to draw multiple design drawings and repeatedly load them to the DMD control chip to achieve different orientations in selected areas. It is necessary to rotate the polarizer once to control the polarization direction of light, resulting in low production efficiency and problems such as mechanical rotation errors

[0005] Specifically, the application number is: 201820881217.1, and the patent name is: a utility model patent for arbitrarily distributed photo-alignment devices with one exposure discloses a photo-controlled alignment technology based on LCOS dynamic masks, which controls pixelated electronically controlled phase delay through voltage The phase delay of each pixel of the device, although the optical path of this method is simple, but this method uses a transmissive spatial light modulator, which consumes a lot of energy

Moreover, due to the limitation of the LCOS working area, it is impossible to realize a large-format, high-precision patterned liquid crystal arrangement

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