Active matrix device and method of driving the same
An active matrix electrowetting on dielectric (AM-EWOD) device includes 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. Each array element circuit includes a top substrate electrode and a drive electrode between which the one or more droplets may be positioned, with an insulator layer being interposed between the one or more droplets and the drive electrode; and write circuitry configured to write data to the array element. At least some of the array element circuits include measure circuitry configured to detect a pinhole defect in the insulator layer.
1. A method of manipulating one or more droplets of fluid on an array, using a plurality of array elements included in an active matrix electrowetting on dielectric (AM-EWOD) device, each of the array elements including a corresponding array element circuit, the method comprising:
writing data to the array element using a write circuitry included in the array element circuit, with an insulator layer being interposed between the one or more droplets and a drive electrode; and
checking an integrity of the insulator layer using a measure circuitry included in at least some of the array element circuits to detect pinhole defects in the insulator layer prior to an assay being undertaken with the device.
2. The method according to claim 1 , comprising:
monitoring an evolution of pinhole defects in the insulator layer by continuous or repeated checking of the insulator layer over time using the measure circuitry to detect pinhole defects.
3. The method according to claim 1 , comprising:
varying a voltage which is written to the drive electrode in order to detect the pinhole defect in the insulator layer.
4. The method according to claim 1 , comprising:
detecting pinhole defects in the insulator layer, using the measure circuitry, without rewriting write data to the array element.
5. The method according to claim 1 , comprising:
detecting pinhole defects in the insulator layer with the measure circuitry; and
determining a route by which to manipulate the one or more droplets taking into account the detected pinhole defects.
6. The method according to claim 1 , comprising:
creating a map of array elements which include a pinhole defect.
7. The method according to claim 1 , comprising:
detecting pinhole defects in the insulator layer in a factory of manufacture, using the measure circuitry.
8. The method according to claim 1 , comprising;
verifying operation of the write circuitry, using the measure circuitry.