Electronic apparatus and mode control method and touch sensing method thereof

1. A touch sensing method of an electronic apparatus, the electronic apparatus comprising a touch sensor and a motion sensor, the touch sensing method comprising:

performing touch detection with the touch sensor to generate a first touch signal, and performing motion detection with the motion sensor to generate a first motion signal, the first touch signal having a first amplitude, the first motion signal having a second amplitude;

determining whether the first amplitude is smaller than a first predetermined value, and determining whether the second amplitude is greater than a second predetermined value; and

when the first amplitude is smaller than the first predetermined value and the second amplitude is greater than the second predetermined value, increasing a signal gain corresponding to the first touch signal,

wherein the electronic apparatus comprises a touch surface, and the first motion signal is associated with a motion in a direction perpendicular to the touch surface, and

the touch sensing method further comprising:

detecting a motion in a direction parallel to the touch surface with the motion sensor to generate a second motion signal, the second motion signal having a third amplitude; and

determining whether the third amplitude is smaller than a third predetermined value.

2. The touch sensing method according to claim 1 , wherein in the step of increasing the signal gain of the first touch signal, when the first amplitude is smaller than the first predetermined value, the second amplitude is greater than the second predetermined value and the third amplitude is smaller than the third predetermined value, the signal gain is increased.

3. The touch sensing method according to claim 1 , further comprising:

determining whether the third amplitude is smaller than the second amplitude;

wherein, in the step of increasing the signal gain of the first touch signal, when the first amplitude is smaller than the first predetermined value, the second amplitude is greater than the second predetermined value, the third amplitude is smaller than the third predetermined value, and the third amplitude is smaller than the second amplitude, the signal gain is increased.

4. The touch sensing method according to claim 1 , further comprising:

performing another motion detection in the direction perpendicular to the touch surface with the motion sensor to generate a third motion signal, between the third motion signal and the first motion signal being a time interval; and

determining whether the time interval is smaller than a predetermined time value;

wherein, in the step of increasing the signal gain of the first touch signal, when the first amplitude is smaller than the first predetermined value, the second amplitude is greater than the second predetermined value and the time interval is smaller than the predetermined time value, the signal gain is increased.

5. The touch sensing method according to claim 1 , further comprising:

after the step of increasing the signal gain, performing touch detection with the touch sensor to generate a second touch signal, the second touch signal having a fourth amplitude;

determining whether the fourth amplitude reaches a saturation value; and

when the fourth amplitude reaches the saturation value, reducing the signal gain.

6. A mode control method of an electronic apparatus, the electronic apparatus comprising a touch sensor and a motion sensor, the mode control method comprising:

performing touch detection with the touch sensor to generate a touch signal;

performing motion detection with the motion sensor to generate a motion signal; and

switching to one of a first mode and a second mode according to the touch signal and the motion signal;

wherein, the first mode and the second mode correspond to a first signal gain and a second signal gain, respectively, and the first signal gain and the second signal gain are for adjusting the touch signal,

wherein the touch signal has a first amplitude, the motion signal has a second amplitude, and the step of switching to one of the first mode and the second mode according to the touch signal and the motion signal comprises:

determining whether the first amplitude is smaller than a first predetermined value, and determining whether the second amplitude is greater than a second predetermined value; and

when the first amplitude is smaller than the first predetermined value and the second amplitude is greater than second predetermined value, switching to the second mode;

wherein the second signal gain is greater than the first signal gain.

7. An electronic apparatus, comprising:

a touch sensor that performs touch detection to generate a first touch signal;

a motion sensor that performs motion detection to generate a first motion signal;

a signal amplifier, in communication with the touch sensor, that performs signal amplification on the first signal; and

a controller, configured to adjust a signal gain of the amplifier according to an amplified first touch signal and the first motion signal,

wherein the amplified first touch signal has a first amplitude, the first motion signal has a second amplitude, and the controller adjusts the signal gain according to a comparison result between the first amplitude and a first predetermined value and a comparison result between the second amplitude and a second predetermined value,

the electronic apparatus further comprising a touch surface, wherein the motion signal is associated with a motion in a direction perpendicular to the touch surface,

wherein the motion sensor further detects a motion in a direction parallel to the touch surface to generate a second motion signal, the second motion signal has a third amplitude, and the controller adjusts the signal gain according to the comparison result between the first amplitude and the first predetermined value, the comparison result between the second amplitude and the second predetermined value and a comparison result between the third amplitude and a third predetermined value.

8. The electronic apparatus according to claim 7 , wherein when the first amplitude is smaller than the first predetermined value, the second amplitude is greater than the second predetermined value and the third amplitude is smaller than the third predetermined value, the controller increases the signal gain.

9. The electronic apparatus according to claim 7 , wherein the motion sensor further performs another motion detection and generates a third motion signal, between the third motion signal and the first motion signal is a time interval, and the controller adjusts the signal gain further according to a comparison result between the time interval and a predetermined time value.