A rigid retractable patio or window awning includes a number of rigid panels disposed in a tiered relationship with each other. More specifically, the inventions provides a color conversion cell which can be positioned in front of a light source in order to generate other color or color temperatures. A composite material is prepared by blending the carbon fibers prepared by the method with, for example, a resin. The light sources are disposed on the first part, and the light-emitting surfaces of the light sources face the light guide plate.