A check valve for a fuel pump of a vehicle includes a valve housing adapted to be disposed in an outlet member of the fuel pump. The display drive circuit includes a conversion section that converts the luminance data having a plurality of bits indicating a luminance level of each of the plurality of subframes into data indicating the luminance level for pixels in a number greater than the number of the plurality of subframes, and a storage section that stores the data converted by the conversion section. Multi-state embodiments are also possible. Symmetrically opposite pairs of same electrodes are electrically interconnected so that the fluorescent screens can simultaneous display a same image.