Self-capacitive touch control apparatus and control method thereof

1. A control method for a self-capacitive touch control apparatus, the self-capacitive touch control apparatus comprising a plurality of electrodes, the control method comprising:

a) detecting capacitance changes in the electrodes to generate sensing results;

b) calculating a total sensing amount according to the sensing results, and determining a number of touch points according to the total sensing amount;

c) grouping the sensing results according to the number of touch points to generate a grouping result; and

d) generating position information of one or more touch points corresponding to the number of touch points according to the grouping result and the sensing results,

wherein the number of touch points is determined by comparing the total sensing amount to a predetermined upper threshold and a predetermined lower threshold.

2. The control method according to claim 1 , wherein step (c) comprises eliminating a part of the sensing results according to a first threshold, the first threshold is for removing at least one interference sensing result from the sensing results; step (d) comprises generating the position information of the one or more touch points corresponding to the number of touch points according to the sensing results preserved.

3. The control method according to claim 1 , wherein the grouping result is one or more groups of sensing results; each group of sensing results comprises at least one sensing result that is greater than a second threshold, which is for confirming the sensing results correspond to at least one touch point.

4. The control method according to claim 1 , wherein the grouping result is one or more groups of sensing results; step (c) comprises searching for an ascending trend and a descending trend from the sensing results, and determining the sensing results between the ascending trend and the descending trend as one group of effective sensing results.

5. The control method according to claim 1 , wherein a target touch point indicated by the grouping result corresponds to an N number of target sensing results among the sensing results, where N is a positive integer; step (d) comprises calculating position information of the target touch point according to equations below, the position information comprises a first coordinate x and a second coordinate y:

x

=

∑

i

=

1

N

⁢

(

C

i

*

X

i

)

∑

i

=

1

N

⁢

C

i

;

and

y

=

∑

i

=

1

N

⁢

(

C

i

*

Y

i

)

∑

i

=

1

N

⁢

C

i

;

wherein, C i represents an i th target sensing result among the N number of target sensing results, the i th target sensing result corresponds to at least one electrode, X i represents a first center of gravity of the at least electrode in a first direction, and Y i represents a second center of gravity of the at least one electrode in a second direction.