Patent ID: 6536914
Filing Date: 2003-03-25
Classification: F21V,F21Y,G02B,G02F,Y10S

Abstract:
An illumination system for illuminating a display device (3), comprisinga light-emitting panel (1) having a light-emission window (2) and at least one light-coupling edge area (4) for coupling light into the light-emitting panel (1), and a light mixing chamber (5) with a longitudinal direction (15) which extends parallel to the light-coupling edge area (4), which light mixing chamber is provided with a light source (6; 6â€²), the light mixing chamber (5) being associated with the light-coupling edge area (4), characterized in that the light source (6, 6â€²) comprises a plurality of clusters of light-emitting diodes (6B, 6G, 6R, . . . ; 16B, 16G, 16R, 16Gâ€², . . . ; 26B, 26G, 26R, 26Gâ€², . . . ) having different light-emission wavelengths, said clusters being arranged at a pitch (P) with respect to each other, and the ratio between a height (H) of the light mixing chamber (5) and the pitch (P) of the clusters of the light-emitting diodes (6B, 6G, 6R, . . . ; 16B, 16G, 16R, 16Gâ€², . . . ; 26B, 26G, 26R, 26Gâ€², . . . ) meets the relation: 0.1&lE;H/P&lE;10, the height H of the light mixing chamber (5) being measured at right angles to the light-coupling edge area (4).