AM-EWOD array element circuitry with integrated sensing and method of sensing droplet merging
US10981168B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2018 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Apr 7, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01L2400/0427
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of operating an active matrix electro-wetting on dielectric (AM-EWOD) device provides for enhanced mutual capacitance sensing using integrated impedance sensing circuitry. Array element circuitry of each array element includes actuation circuitry configured to apply actuation voltages to the array element electrode for actuating the array element, and impedance sensor circuitry integrated into the array element circuitry and configured to sense impedance at the array element electrode. The method of operating includes the steps of: perturbing a voltage applied to the array element electrode of a first array element; coupling the voltage perturbation to the array element electrode of a second array element different from the first array element; and measuring the output current from the sensor readout transistor of the second array element for sensing in response to the voltage perturbation. The method may be performed by an AM-EWOD control system executing program code stored on a non-transitory computer readable medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.