Fig. 1. （a）Optical path diagram of liquid crystal Lieb structure；（b）Orientation diagram of liquid crystal molecules in liquid crystal cell.

Fig. 2. Images of Lieb lattice structure under polarization microscope

Fig. 3. Four incidence modes of incident light in diffraction measurement of liquid crystal Lieb structure.（a）y polarized light is incident from the pattern plane；（b）x polarized light is incident from the pattern plane；（c）y polarized light is incident from a uniform directional plane；（d）x polarized light is incident from a uniformly oriented plane.

Fig. 4. Diffraction pattern changes under different voltages of four incident schemes.（a）Incidence mode 1；（b）Incidence mode 2；（c）Incidence mode 3；（d）Incidence mode 4.

Fig. 5. Polarization without applied voltage in four incident schemes.（a）Incidence mode 1；（b）Incidence mode 2；（c）Incidence mode 3；（d）Incidence mode 4.

Fig. 6. Variation of zero-order diffraction of four incident schemes with voltage.（a）Incidence mode 1；（b）Incidence mode 2；（c）Incidence mode 3；（d）Incidence mode 4.

Fig. 7. Variation of first-order diffraction of four incident schemes with voltage.（a）Incidence mode 1；（b）Incidence mode 2；（c）Incidence mode 3；（d）Incidence mode.

Fig. 8. （a）Switching electro-optic characteristics of 5 μm TN liquid crystal cell and PA liquid crystal cell；（b）Schematic diagram of continuous distribution of liquid crystal molecules in liquid crystal cell.