US Patent 11338293 Microfluidic device, droplet identification method and droplet control method

A microfluidic device includes a first substrate and a second substrate opposite to each other. A light-emitting layer, a first driving layer, and a first hydrophobic layer are on surface of the first substrate facing the second substrate; and first hydrophobic layer is disposed near second substrate; a photosensitive layer, a second driving layer and a second hydrophobic layer are on surface of the second substrate facing the first substrate; and second hydrophobic layer is disposed near first hydrophobic layer, and a gap for holding a droplet is between second hydrophobic layer and first hydrophobic layer; the first and second driving layers are configured to drive the droplet to move within the gap when applied with a driving voltage; the light-emitting layer is configured to emit light with a set wavelength toward the gap; and the photosensitive layer is configured to generate an induced current according to received light.