PROBLEM TO BE SOLVED: To provide a color liquid crystal display device assembly including a luminescent particle layer having a desired size. SOLUTION: In a color liquid crystal display device assembly including a color liquid crystal display device and a plate light source device 60, a light source emits a first primary color light. In a first face side of a first substrate 10 of a front panel of the color liquid crystal display device, second and third primary color emitting regions 152 and 153 including second and third primary color luminescent particle layers 152A and 153A for emitting second and third primary light, excited by the first primary color light which passes through second and third sub-pixels, and a diffusion region 151 for diffusing the first primary color light which passes through the first sub-pixel, are provided. An under layer 150 is provided under the second and third primary color luminescent particle layers 152A and 153A. The second and third primary color luminescent particle layers 152A and 153A include binders, and the under layer 150 is composed of the same material with the material for composing the binder. COPYRIGHT: (C)2010,JPO&INPIT