Variable diaphragm and control method thereof

Abstract

A variable diaphragm and a control method thereof are provided. The variable diaphragm includes: a first substrate and a second substrate opposite to each other; a light detector on a side of the first substrate distal to the second substrate, and configured to detect an intensity of incident light and generate a first signal; an electrowetting microfluid medium layer between the first substrate and the second substrate, and including a transparent fluid medium and an opaque fluid medium immiscible with the transparent fluid medium, wherein an aperture of the variable diaphragm is formed by the transparent fluid medium, and one of the transparent fluid medium and the opaque fluid medium is a conductive medium; and a driving electrode between the first substrate and the second substrate, and configured to receive a driving voltage corresponding to the first signal and for driving the electrowetting microfluid medium layer, so as to change an area in a direction parallel to the first substrate or the second substrate of a portion of one substrate covered by the opaque fluid medium, the one substrate being one of the first substrate and the second substrate that has a larger contact area with the opaque fluid medium, thereby changing a diameter of the aperture.

Dependencies are inferred from the claim text.