The drift current flowing in an electronic paper due to charged particles is analyzed. Sample panels having barrier ribs are fabricated using a photolithographic process: the cells have a rib height of 53.57 μm, a size of 220 μm × 220 μm, and a total capacitive area of 6.22 cm2. The upper and lower electrodes are fabricated with indium tin oxide and biased between − 2 and + 2 V. The electronic ink is loaded into the samples with different particle concentrations in an electrically neutralized fluid with mixing ratios of 1:0.2, 1:1, and 1:5 as a weight ratio. In the amplitudes of the current peaks, we see that the charged particles of the sample having mixing ratio of 1:0.2 have the most rapid slope with current value of 3.58 μΑ, without any interference from other neighboring particles. Particles of the sample having mixing ratio of 1:5 show the least saturation current than those of other samples. We ascertained that the point where the reflectivity change starts is not the point to which the input pulse is applied, but the maximum value of the current because of displacement current and delay time.