Pitch-adjustable liquid crystal phase grating based on vertical and plane switching mode

The invention discloses a pitch-adjustable liquid crystal phase grating based on a vertical and plane switching mode. The pitch-adjustable liquid crystal phase grating comprises an upper glass substrate, an upper plane transparent electrode (P1), a liquid crystal layer, a lower strip-shaped transparent electrode (P2), a lower low dielectric layer, a lower plane transparent electrode (P3) and a lower glass substrate. When voltage is applied to the upper plane transparent electrode and the lower strip-shaped transparent electrode, a large-pitch liquid crystal grating is generated on the liquid crystal layer. When voltage is applied to the lower strip-shaped transparent electrode and the lower plane transparent electrode, a small-pitch liquid crystal grating is generated on the liquid crystal layer. The electrodes generating different pitches are arranged on the surface of the liquid crystal layer, and liquid crystal gratings with different pitches can be generated on the liquid crystal layer by adjusting differ