| 摘要 |
A liquid crystal device (10) comprising a first liquid crystal cell (11) and a second liquid crystal cell (12) arranged in a layered configuration such that light having passed through the first liquid crystal cell (11) hits the second liquid crystal cell (12). Each of the first liquid crystal cell (11) and the second liquid crystal cell (12) is individually controllable between a relaxed state in which the liquid crystal cell exhibits a first birefringence and a switched state in which the liquid crystal cell exhibits a second birefringence. A transition of the first liquid crystal cell (11) from the relaxed state to the switched state results in a change in a total 10 birefringence of the liquid crystal device (10) from a first total birefringence to a second total birefringence being such that the liquid crystal device (10) transitions from a first light modulation state to a second light modulation state, and a subsequent transition of the second liquid crystal cell (12) from the relaxed state to the switched state results in a change in the total birefringence of the liquid crystal device (10) from the second total birefringence to the first total birefringence whereby the liquid crystal device (10) transitions back from the second light modulation state to the first light modulation state. Hereby, both the switching from the first light -modulation state of the liquid crystal device (10) to the second light -modulation state of the liquid crystal device (10) and the switching back to the first light -modulation state are achieved using the fast process of actively reorienting the liquid crystal molecules (18, 23) in the respective liquid crystal cells (11, 12) through the application of an electric field. |
