Elimination of chromatic aberration and tuning of the saturation in reflective flat-panel display by utilizing monodisperse colloidal crystal beads as pixels

We proposed an idea for overcoming the difficulties met by the application of colloidal photonic crystal in flat-panel displays, such as overcoming the viewing angle dependence, displaying a complicated image, and, how to control the brightness and saturation of each pixel. In our strategy, nanospheres were firstly self-assembled into uniform spherical units, and then the colloidal crystal units were patterned as pixels. This method was favorable to realize the fabrication of display device in a large scale, with controllable uniformity and easily pattern designing. The problem that display colors varies with the observation angle can probably be adequately corrected through the homogeneity derived from the spherical symmetry of the colloidal crystals. Nematic liquid crystals were infiltrated into the voids of the inverse opaline colloidal crystal unit, and the saturation of the pixels can be controlled by utilizing the field response feature of the liquid crystals.