Liquid crystal grating and stereoscopic display device

A liquid crystal grating, comprising at least one liquid crystal cell,

• wherein a liquid crystal cell of the at least one liquid crystal cell comprises:
• a first substrate, first electrodes, a first alignment layer, a liquid crystal layer and a second substrate which are disposed sequentially;
• wherein in a first state, the liquid crystal cell comprises a plurality of first grating units which are arranged along a first direction, and a first grating unit of the plurality of first grating units comprises a plurality of first electrodes disposed along the first direction, and the plurality of first electrodes are disposed at intervals from each other;
• and
• along the first direction, a first electric field is formed between two closest first electrodes which are located in two adjacent first grating units of the plurality of first grating units, respectively, and in the liquid crystal cell, an alignment direction of the first alignment layer is the same as an electric field direction of the first electric field;
• wherein the liquid crystal cell further comprises a second electrode, and the second electrode is located between the second substrate and the liquid crystal layer;
• and
• wherein the liquid crystal cell further comprises a second alignment layer, and the second alignment layer is located between the second electrode and the liquid crystal layer;
• the first grating unit comprises a plurality of second electrodes which are disposed at intervals from each other along the first direction;
• and
• along the first direction, a second electric field is formed between two closest second electrodes which are located in the two adjacent first grating units, respectively, and in the liquid crystal cell, an alignment direction of the second alignment layer is the same as an electric field direction of the second electric field.

A liquid crystal grating, comprising at least one liquid crystal cell,

• wherein a liquid crystal cell of the at least one liquid crystal cell comprises:
• a first substrate, first electrodes, a first alignment layer, a liquid crystal layer and a second substrate which are disposed sequentially;
• wherein in a first state, the liquid crystal cell comprises a plurality of first grating units which are arranged along a first direction, and a first grating unit of the plurality of first grating units comprises a plurality of first electrodes disposed along the first direction, and the plurality of first electrodes are disposed at intervals from each other;
• and
• along the first direction, a first electric field is formed between two closest first electrodes which are located in two adjacent first grating units of the plurality of first grating units, respectively, and in the liquid crystal cell, an alignment direction of the first alignment layer is the same as an electric field direction of the first electric field;
• and
• wherein the liquid crystal grating further comprises two liquid crystal cells which are stacked, wherein the two liquid crystal cells are a first liquid crystal cell and a second liquid crystal cell respectively;
• in the first state, the first liquid crystal cell comprises first grating units, the second liquid crystal cell comprises at least one third grating unit, and a third grating unit of the at least one third grating unit comprises a plurality of first electrodes which are disposed at intervals from each other along the first direction;
• and
• along the first direction, a fourth electric field is formed between two adjacent first electrodes which are located in a same third grating unit of the at least one third grating unit, and an electric field direction of the fourth electric field is opposite to the electric field direction of the first electric field.