Apparatus with both touch sensing and electrical field sensing functions and interactive apparatus using the same

摘要

An apparatus with both touch sensing and electrical field sensing functions and an interactive apparatus using the same are provided. The apparatus with both touch sensing and electrical field sensing functions comprises a control circuit, a first capacitive sensing electrode and a second capacitive sensing electrode. The first capacitive sensing electrode is coupled to a first sensing control terminal of the control circuit. The second capacitive sensing electrode is coupled to a second sensing control terminal of the control circuit. In a first period, the first capacitive sensing electrode is charged to a first voltage through the first sensing control terminal, and the second sensing control terminal supplies an electrical field pulse to the second capacitive sensing electrode such that the second capacitive sensing electrode outputs an electrical field pulse signal. In the first period, the control circuit determines whether the first capacitive sensing electrode is touched or not according to a period, during which a voltage of the first capacitive sensing electrode is discharged from the first voltage to a second voltage, and determines whether the second capacitive sensing electrode approximates the first capacitive sensing electrode or not according to whether the first capacitive sensing electrode synchronously detects the electrical field pulse or not.

主权项

1. An apparatus with both touch sensing and electrical field sensing functions, the apparatus comprising:
a control circuit having a first sensing control terminal and a second sensing control terminal; a first capacitive sensing electrode coupled to the first sensing control terminal; and a second capacitive sensing electrode coupled to the second sensing control terminal; wherein in a first period, the second capacitive sensing electrode is charged to a first voltage through the second sensing control terminal; wherein in the first period, the first sensing control terminal supplies an electrical field pulse to the first capacitive sensing electrode such that the first capacitive sensing electrode outputs an electrical field pulse signal, wherein in the first period, the control circuit determines whether the second capacitive sensing electrode synchronously detects the electrical field pulse or not, and the control circuit determines a period, during which a voltage of the second capacitive sensing electrode is discharged from the first voltage to a second voltage, to determine whether the second capacitive sensing electrode is touched or not; wherein in a second period, the first capacitive sensing electrode is charged to the first voltage through the first sensing control terminal; wherein in the second period, the second sensing control terminal supplies the electrical field pulse to the second capacitive sensing electrode such that the second capacitive sensing electrode outputs the electrical field pulse signal, wherein in the second period, the control circuit determines whether the first capacitive sensing electrode synchronously detects the electrical field pulse or not, and the control circuit determines a period, during which a voltage of the first capacitive sensing electrode is discharged from the first voltage to the second voltage, to determine whether the first capacitive sensing electrode is touched or not.