Abstract: A lighting device includes a light guide having a light output surface, one or more LED packages having two or more spatially separated LED chips, and two or more wavelength dependent modification features located on the output surface of the light guide. Each wavelength dependent modification features is configured to modify the intensity of light from one or more of the LED chips to provide homogeneous colored light.

Abstract: A pixelated lighting device (8) comprising one or more light sources (10) embedded within a composite light-guide is disclosed. The pixelated lighting device incorporates refractive light barriers (15) to achieve contrast between adjacent pixels (16a, 16b). These features combine to provide a pixelated lighting device with an acceptable contrast ratio and with a very high fill factor.

Abstract: A lighting device (21) comprising a light guide (12) and LED packages (1) having two or more spatially separated LED chips (2,3,4) is described. The LED packages (1) generate two or more light outputs at two or more separate wavelengths which are optically coupled into the light guide (12). A portion of the two or more light outputs exit the light guide (12) via a light output surface (14). Wavelength dependent modification features (22) are arranged to modify the intensity of at least one of the two or more light outputs to provide the lighting device (21) with a homogeneous colour light output. The LED packages (1) may comprise RGB LED packages, and the wavelength dependent modification features (22) are arranged to provide a homogeneous white light output. This provides a lighting device (21) capable of providing low intensity light levels over a large surface area which are thinner and cheaper to produce than those devices known in the art.