Preparation method of holographic polymer dispersion liquid crystal varied line-space grating

The invention relates to a preparation method of a holographic polymer dispersion liquid crystal varied line-space grating. According to the preparation method, a varied line-space grating exposure optical path is constructed, a beam splitting prism is adopted to carry out beam splitting in the left and in the right, and therefore, a varied line-space grating with a left and right eye stereo beam splitting function can be obtained. An optical path diagram in grating exposure is intuitive, and a stereo beam splitting function can be realized conveniently; based on the principle of the varied line-space grating, light on a display can be all emitted with different diffraction angles; and based on the left and right eye stereo beam splitting function, stereo display image splitting in different ranges can be realized, and a user can see a stereo display effect as long as the eyes of the user are in the diffraction range of the varied line-space grating; a polymer dispersion liquid crystal material can respond to