A display device comprises a display panel comprising high brightness subpixel repeating groups\u2014for example, RGBW display panels. In particular, the vitamin derivatives are constituted by salts of menadione bisulfite with the heterocyclic bases triazine and piperazine. The float partition is utilized to provide additional space to the NOS partition and the images partition, when required. An elongated member is coupled to the mechanism. The ferroelectric single crystal substrate has an insulating film formed on one surface and is bonded to the base substrate such that the insulating film faces the transparent electrode. Vent member sections may be installed end-to-end to define an elongated airflow channel adapted for ventilating with or without assistance from the fans.