Driving circuit and operating method thereof and controlling circuit
A driving circuit and an operating method thereof and a controlling circuit which are suitable for a knob apparatus are provided. The driving circuit includes multiple touch-sensing electrodes and a controlling circuit. The knob apparatus includes a knob and a touch panel. The knob is disposed on the touch panel. The touch-sensing electrodes and the controlling circuit are disposed in the touch panel. The touch-sensing electrodes are coupled to multiple pixel switches of the touch panel. The controlling circuit is coupled to the touch-sensing electrodes. During a touch period, the controlling circuit provides an offset voltage to a first touch-sensing electrode of the touch-sensing electrodes, such that a first pixel switch coupled to the first touch-sensing electrode maintains being turned off according to a touch-controlling signal and the offset voltage.
1 . A driving circuit, for a knob apparatus, wherein the knob apparatus comprises a knob and a touch panel, the knob is disposed on the touch panel, wherein the driving circuit comprises:
a plurality of touch-sensing electrodes, disposed in the touch panel and coupled to a plurality of pixel switches of the touch panel; and
a controlling circuit, disposed in the touch panel, coupled to the plurality of touch-sensing electrodes, and configured to provide an offset voltage to a first touch-sensing electrode of the plurality of touch-sensing electrodes during a touch period, and a first pixel switch coupled to the first touch-sensing electrode maintains being turned off according to a touch-controlling signal and the offset voltage.
2 . The driving circuit according to claim 1 , wherein the controlling circuit provides the offset voltage according to characteristics of the plurality of pixel switches.
3 . The driving circuit according to claim 1 , wherein the first pixel switch is a transistor,
wherein a control terminal of the transistor receives the touch-controlling signal, and a first terminal of the transistor receives the offset voltage and a liquid crystal electrode voltage in the touch panel during the touch period, such that a voltage difference between the control terminal and the first terminal of the transistor is less than a threshold voltage value of the transistor.
4 . The driving circuit according to claim 1 , wherein the offset voltage is a direct current voltage and has a voltage value greater than 0 volts.
5 . The driving circuit according to claim 1 , wherein the controlling circuit is further configured to provide a touch driving signal to a second touch-sensing electrode of the plurality of touch-sensing electrodes during the touch period, such that a second pixel switch coupled to the second touch-sensing electrode maintains being turned off according to the touch-controlling signal and the touch driving signal.
6 . The driving circuit according to claim 5 , wherein the second pixel switch is a transistor,
wherein a control terminal of the transistor receives the touch-controlling signal, and a first terminal of the transistor receives the touch driving signal and a liquid crystal electrode voltage in the touch panel during the touch period, such that a voltage difference between the control terminal and the first terminal of the transistor is less than a threshold voltage value of the transistor.
7 . The driving circuit according to claim 5 , wherein the offset voltage is a combination of a direct current voltage and an inverse phase of the touch driving signal.
8 . The driving circuit according to claim 5 , wherein the touch driving signal is one of a sine wave signal, a square wave signal, and a triangle wave signal.
9 . An operating method of a driving circuit, for a knob apparatus, wherein the knob apparatus comprises a knob and a touch panel, the knob is disposed on the touch panel, wherein the operating method comprises:
providing, by a controlling circuit, an offset voltage to a first touch-sensing electrode of a plurality of touch-sensing electrodes during a touch period, wherein the plurality of touch-sensing electrodes and the controlling circuit are disposed in the touch panel, and the plurality of touch-sensing electrodes are coupled to a plurality of the pixel switches of the touch panel, and
maintaining, by the controlling circuit, a first pixel switch coupled to the first touch-sensing electrode being turned off according to a touch-controlling signal and the offset voltage during the touch period.
10 . The operating method according to claim 9 , further comprising:
providing, by the controlling circuit, the offset voltage according to characteristics of the pixel switches.
11 . The operating method according to claim 9 , wherein the first pixel switch is a transistor, the operating method further comprises:
receiving, by a control terminal of the transistor, the touch-controlling signal during the touch period; and
receiving, by a first terminal of the transistor, the offset voltage and a liquid crystal electrode voltage in the touch panel during the touch period, such that a voltage difference between the control terminal and the first terminal of the transistor is less than a threshold voltage value of the transistor.
12 . The operating method according to claim 9 , wherein the offset voltage is a direct current voltage and has a voltage value greater than 0 volts.
13 . The operating method according to claim 9 , further comprising:
providing, by the controlling circuit, a touch driving signal to a second touch-sensing electrode of the plurality of touch-sensing electrodes during the touch period; and
maintaining, by the controlling circuit, a second pixel switch coupled to the second touch-sensing electrode being turned off according to the touch-controlling signal and the touch driving signal during the touch period.
14 . The operating method according to claim 13 , wherein the second pixel switch is a transistor, the operating method further comprises:
receiving, by a control terminal of the transistor, the touch-controlling signal during the touch period; and
receiving, by a first terminal of the transistor, the touch driving signal and a liquid crystal electrode voltage in the touch panel during the touch period, such that a voltage difference between the control terminal and the first terminal of the transistor is less than a threshold voltage value of the transistor.
15 . The operating method according to claim 13 , wherein the offset voltage is a combination of a direct current voltage and an inverse phase of the touch driving signal.
16 . The operating method according to claim 13 , wherein the touch driving signal is one of a sine wave signal, a square wave signal, and a triangle wave signal.
17 . A controlling circuit, to control a voltage level of a touch-sensing electrode disposed in a touch panel at different moments, wherein the touch-sensing electrode corresponds to a conductive electrode which is disposed in a bottom of a knob, when the knob is disposed in the touch panel, a user operates the touch panel through the knob, wherein the controlling circuit comprises:
a signal transmission circuit, having a plurality of first terminals for receiving an offset voltage, a touch driving signal and a reference voltage, wherein a second terminal of the signal transmission circuit is coupled to the touch-sensing electrode to provide one of the offset voltage, the touch driving signal and the reference voltage to the touch-sensing electrode during a touch period, or to receive a touch result signal,
wherein during the touch period, a pixel switch which is coupled to the touch-sensing electrode and is disposed in the touch panel maintains turned off according to a touch-controlling signal and the offset voltage;
an amplification circuit, coupled to one of the plurality of first terminals of the signal transmission circuit to receive the touch result signal; and
a signal processing circuit, coupled to the amplification circuit, to generate a touch output signal according to the touch result signal.