When current occurs due to charge flow, it is called conduction. Since there are no conductors between the plates of the capacitor, there is no charge transfer between them and the conduction current becomes zero.
However, when the capacitor is charged, the charges accumulate on the plates and, therefore, the electric field across the plates E increases with time. This variation of the electric field in the plates of the capacitor is called the displacement current,
so in the displacement current, there is no electric current due to the movement of the charges, but due to the variation of the electric field between the two points.
so I ∝ Rate of accumulations of the charge across plate capacitor
