Imaging detection assembly

Abstract

The invention discloses an imaging detection assembly, which is applied to a patterned liquid crystal photo-alignment device and comprises a first beam splitter, a barrel lens, an imaging objective lens group, a polarizing film, a first lens and a first imaging CCD which are connected in sequence, the front focal plane of the imaging objective lens group is positioned near the rear focal plane of the barrel lens; the imaging surface of the first imaging CCD is positioned on the front focal plane of the first lens; the rear focal plane of the first lens is positioned on the front focal plane of the barrel lens; the imaging detection assembly is used for detecting imaging of the generated liquid crystal light orientation pattern. According to the invention, an image reflected from the surface of the light polarization sensitive material enters the first imaging CCD through the first lens by using the imaging detection assembly, and whether the focal plane of the objective lens is on the surface of the light sensitive material is judged by observing the contrast ratio of the outline of an imaging light spot in the first imaging CCD, so that accurate detection of imaging is realized; and the method has great significance for realizing large-breadth, high-efficiency and high-reliability liquid crystal light orientation.

Description

technical field [0001] The invention relates to the field of alignment control of liquid crystals, in particular to an imaging detection component in a patterned liquid crystal photo-alignment device. Background technique [0002] Liquid crystals are widely used in information display, optical and photonic devices and other fields; liquid crystals can further realize the amplitude, phase and polarization modulation of light according to the designed orientation arrangement, which plays an important role in these applications, so the orientation arrangement of liquid crystals The control method has become a research hotspot in academic and industrial production. The existing technologies disclosed at present are mainly rubbing alignment technology and light-controlled alignment technology: [0003] Photo-controlled alignment is a newly developed non-contact liquid crystal alignment method, which uses photosensitive materials to undergo directional photocrosslinking, isomeriza...

AI Technical Summary

Problems solved by technology

[0005] Patent application number CN201820881217.1 discloses a photo-alignment device for realizing arbitrary distribution in one exposure, and it introduces a photo-controlled alignment method using a pixelated electronically controlled phase delay device for a single exposure, wherein the pixelated electronically controlled phase delay device The phase delay of each pixel is controlled by the corresponding voltage, which is used to generate the phase delay of any pattern distribution, but the problem brought about by one exposure to generate the phase pattern is that the amount of data is proportional to the size of the format, which limits the preparation The format size of the device is also doomed to be unable to produce high-precision and high-resolution photo-alignment patterns

[0006] Foreign beam companies provide a device and method for optical alignment using continuous laser irradiation on LCOS phase modulation devices (De Sio L, Roberts D E, Liao Z, et al. Digital polarization holography advancing geometrical phase optics[J]. Optics express, 2016 , 24(16): 18297-18306.), they used a low-energy continuous laser for exposure. Considering the information content of the image, exposure uniformity, material heat capacity, thermal diffusion and other properties, it takes tens of seconds to expose a single field of view. It takes tens of minutes, and the exposure format is limited by the image information, so it is impossible to perform photo-orientation on a large-area format

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