Low-speed motion control method and system applied to LCOS system phase modulation workbench

Abstract

The invention discloses a low-speed motion control method applied to a phase modulation workbench of an LCOS system, which comprises the following steps: carrying out data processing on a large-format processing graph and dividing the large-format processing graph into a plurality of graph blocks, and controlling the workbench to move to a specified position corresponding to a two-dimensional physical coordinate by a motion controller; uploading the graphic block file to an LCOS board card memory, and displaying the graphic block file on an LCOS panel; enabling the motion controller to control a pulse light source switch to form primary exposure; and enabling the workbench to move to a designated position corresponding to the next two-dimensional physical coordinate until the two-dimensional physical coordinate points of the whole large-format processing graph are executed. According to the invention, the characteristics of large pulse laser energy, short pulse width and high repetition frequency are utilized, single-frame polarization pattern recording is realized based on a single pulse, and the advantages of large exposure area, high efficiency and good reliability are realized by accurately controlling the movement of the workbench.

Description

technical field [0001] The invention relates to the field of liquid crystal orientation alignment control, in particular to a low-speed motion control method and system applied to a phase modulation workbench of an LCOS system. Background technique [0002] The polarization orientation technology based on the liquid crystal spatial modulator is a programmable control device that can modulate the phase and amplitude of the incident light. A single projection orientation can realize the pattern recording of different orientations of liquid crystals in different selected areas. [0003] 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 correspo...

AI Technical Summary

Problems solved by technology

[0003] 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

[0004] 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

Images