Patent ID: 8173000

Claim:
An active matrix electrowetting on dielectric (AM-EWOD) device, comprising: a plurality of array elements configured to manipulate one or more droplets of fluid on an array, each of the array elements including a corresponding array element circuit, wherein each array element circuit includes a top substrate electrode and a drive electrode between which the one or more droplets may be positioned; circuitry configured to write data to the corresponding array element by selectively applying to the drive electrode either: (i) a time-varying voltage waveform V 1 of amplitude V B and period t 0 ; or (ii) a time-varying voltage waveform V 2 , the logical inverse of V 1 , and applying to the top substrate electrode the time-varying voltage waveform V 2 +V offset , where V offset represents an offset voltage signal which may have AC and/or DC components and may equal zero.