The present disclosure provides a white blood cell differentiation reagent comprising a fluorescent dye compound of Formula I, wherein R1, R2, R3, R4, Y\u2212 and n are as defined in the specification. The method includes the steps of: collecting operation data obtained; and obtaining a moving average of a preset number of sets of data using the processing result data collected at the data collection step. Each of the plurality of pixels includes a light emitting element, a transistor, and an alternate current driving bypass element.