What's the difference between DC and video automatic aperture lens?

There are two driving modes of automatic aperture, one is video driving and the other is DC driving. Video-driven lens is a driving circuit board with an aperture motor installed in the lens. The camera outputs image signals to the driving circuit board, and then the aperture motor is changed by the driving circuit board, so that the aperture is changed, which is expensive in cost and construction. DC drive lens cooperates with some camera manufacturers to transfer the drive circuit board originally installed in the lens to the camera, so that the lens does not need to drive the circuit board, and the camera directly outputs DC current to change the aperture motor, thus changing the aperture. Because the joint is fixed, the cost is lower and the construction is easier. At present, two integrated cameras are used in the market.