Patent ID: 6672734
Filing Date: 2004-01-06
Classification: G02B

Abstract:
An illumination system for illuminating a display device, which illumination system is provided with a light-emitting panel comprisinga front wall and, opposite thereto, a rear wall as well as first and second light-transmitting edge surfaces which are situated between the front wall and the rear wall, at least one first light source being associated with the first edge surface and at least one second light source being associated with the second edge surface, and in operation, light originating from the first light source being incident on the first light-transmitting edge surface, and light originating from the second light source being incident on the second light-transmitting edge surface, said light spreading in the light-emitting panel, wherein a first sub-surface of the front wall or of the rear wall of the light-emitting panel is provided with first coupling-out members for coupling light out of the panel, which light predominantly originates from the first light source, a second sub-surface of the front wall or of the rear wall of the light-emitting panel is provided with second coupling-out members for coupling light out of the panel, which light predominantly originates from the second light source, the concentration of the first coupling-out members near the second edge surface being higher than the concentration of the second coupling-out members, and the concentration of the second coupling-out members near the first edge surface being higher than the concentration of the first coupling-out members, and the first and second sub-surfaces overlap.