DIRECTION-DEPENDENT CONTROL OF LIGHT GUIDE

摘要

A light-guide (2; 41; 81; 91) configured to guide light within the light-guide through reflections between opposite faces (14, 15) thereof. The light-guide comprises a first light-guide portion (9e) controllable to selectively outcouple light traveling in a first direction of propagation within the light-guide (2; 81; 91) through at least one of the faces (14, 15); and a second light-guide portion (9d, 9f) controllable to selectively outcouple light traveling in a second direction of propagation, different from the first direction of propagation, within the light-guide (2; 41; 81; 91) through at least one of the faces (14, 15). Hereby, output of light that has been injected into the light-guide can be controlled not only through the outcoupling state of a selected portion of the light-guide, but also through the direction of propagation within the light-guide of the injected light.