Fig. 1. （a） Construction method of the chiral nematic liquid crystal helical structure； （b） Main control methods of the liquid crystal helical structure.

Fig. 2. （a） Chiral molecules based on double bond isomerization： azobenzene and molecular motors； （b） Chiral diarylethene based on photocyclization： external chirality and intrinsic chirality.

Fig. 3. （a） Tristable chiral azobenzene switch and its display of Chinese Mahjong patterns against a black （RGBB） background^［35］； （b） Visible light-driven chiral azobenzene switch and its reversible dynamic control of circularly polarized reflection^［36］.

Fig. 4. （a） Visible light-driven macrocyclic chiral azobenzene switch enabling reversible chiral inversion of self-assembled helical structures^［37］； （b） Light- and heat-driven circularly polarized luminescent chiral azobenzene molecular switch^［38］； （c） Construction of helical inversion through light-controlled chiral competition enables dynamic geometric phase optics and hybrid multiplexed holography^［39-40］.

Fig. 5. （a） Molecular motors in liquid crystal systems use light to rotate objects thousands of times larger than themselves^［45］； （b） Light-driven molecular motors enabling wide-range liquid crystal helical structures^［46］； （c） Light-driven molecular motors enabling helical motion of liquid crystal microdroplets^［47］.

Fig. 6. （a） Light-driven molecular motors dynamically modulating organic ultralong room temperature phosphorescence^［48］； （b） Four-step rotational cycle of molecular motors and its visualization in pattern recording^［49］.

Fig. 7. （a） Externally central chiral diarylethene enables the presence and pitch of liquid crystal helical structures^［55-56］； （b） Externally axial chiral diarylethene enables RGB tuning of liquid crystal helical structures^［57］； （c） Optimization of externally axial chiral diarylethene molecules and corresponding modulation of liquid crystal helical structures^［58-60］.

Fig. 8. （a） Light-driven chiral DAE liquid crystal systems for three-dimensional dynamic tuning of helical structures， light-electric combined control， and near-infrared light-driven helical inversion^［61-63］； （b） Externally axial chiral diarylethene molecules enabling directional inversion of liquid crystal helical structures^［64］.

Fig. 9. Light-driven dynamic control of liquid crystal helical structures with intrinsic chiral DAE photoswitch^［68］. （a） Molecular structure transformation； （b） Broad-range structural color modulating； （c） Multiple anti-counterfeiting technologies.

Fig. 10. （a） Intrinsic chiral DAE photoswitch enabling four-dimensional laser modulation^［69］； （b） Intrinsic chiral DAE photoswitch enabling inhomogeneous liquid crystal helical structure modulation^［70］； （c） Copper-gated intrinsic chiral photoswitch enabling multiple degree-of-freedom modulation of liquid crystal helical structures^［71］.

Fig. 11. （a） Light-driven elongation actuation of liquid crystal elastomer films based on azobenzene photoswitches^［82］； （b） Photorewritable fluorescent patterns and reconfigurable 3D deformation in liquid crystal elastomer films based on the synergistic action of azobenzene and diarylethene photoswitches^［83］； （c） Reconfigurable fluorescent liquid crystal elastomer integrated with visual and haptic information storage based on diarylethene photoswitches^［84］； （d） Photoresponsive liquid crystal elastomer with biomimetic functions based on molecular motors photoswitches^［85］； （e） Dual-mode pattern information encryption based on azobenzene photoswitches^［86］； （f） Four-dimensional anti-counterfeiting flexible labels based on diarylethene photoswitches^［87］.