LIGHTING DEVICE

摘要

The present invention relates to a lighting device wherein an in-coupled light flow is at least partly constrained within a light-guide plate (4) by means of total internal reflection. The device includes means for achieving a selective local light output from the output surface (6) of the light-guide plate, such that the intensity of the emitted light flow from the light guide can be locally controlled over its output surface area. This is achieved by a number of closed cells adjoining the output surface. Each cell contains a liquid element (11), the form of which may be manipulated by electrowetting, such that the liquid can be brought to a greater or lesser extent into optical contact or out of optical contact with a local area of the output surface (6), thereby varying the intensity of the locally out-coupled light flow therethrough.