| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for modulating a reference voltage to perform capacitive sensing.SOLUTION: This disclosure generally provides an input device having a reference voltage modulator that modulates reference voltage rails when performing capacitive sensing. In one embodiment, the reference voltage rails are coupled to a DC power source which provides power for operating a panel including a display screen integrated with a touch sensing region. Before performing capacitive sensing, the input device may isolate the DC power source from the reference voltage rails and use the reference voltage rails to modulate rails (e.g., Vand V). The input device includes a receiver that simultaneously acquires resulting signals from a plurality of display and/or sensor electrodes when modulating the reference voltage rails. The resulting signals are then processed to determine if an input object is interacting with the input device.SELECTED DRAWING: Figure 2 |
