| 摘要 |
A controllable light guide (101; 405) comprising a light guide (103) configured to guide in-coupled light through reflections of the light against a guiding boundary (109) of the light guide (103), and at least one light-modifying member (102; 201-202; 303-304; 414-416) arranged adjacent to the guiding boundary (109) of the light guide (103). The light-modifying member (102; 201-202; 303-304; 414-416) comprises a fluid (104) and a plurality of particles (105) distributed in the fluid. The light-modifying member is controllable between at least a first state having a first particle distribution resulting in at least a portion (106; 209, 210) of the light-modifying member (102; 201-202; 303-304; 414-416) having a first compound refractive index (rid), and a second state having a second particle distribution resulting in the portion (106; 209, 210) of the light-modifying member having a second compound refractive index (n^). At least the second compound refractive index (nc2) is sufficiently high in relation to the refractive index of the light guide (103) at the guiding boundary (109) so as to allow at least partial outcoupling of light through a corresponding portion of the guiding boundary of the light guide.
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