Method for preventing false activation of touch pad

A method for preventing a false activation of a touch pad, the touch pad defining a touch area, the method comprising:

• setting a lock threshold Nlock and a sensing signal threshold Vlock;
• scanning the touch pad and detecting a plurality of touch nodes in each of a plurality of subareas of the touch pad and a sensing signal value Vi corresponding to each of the touch nodes when there is a touch acted on the touch area;
• determining if the sensing signal value Vi corresponding to each of the plurality of touch nodes is larger than or equals to the sensing signal threshold Vlock,
• determining a certain touch node being as a touch point when the sensing signal value Vi corresponding to the certain node is larger than or equals to the sensing signal threshold Vlock;
• counting a quantity Ni of touch points in each of the plurality of subareas;
• determining if the quantity Ni of the touch points in each of the plurality of subareas is less than the lock threshold Nlock;
• maintaining a certain subarea being touchable when the quantity Ni of the touch points in the certain subarea is less than the lock threshold Nlock;
• and
• maintaining the certain subarea being untouchable when the quantity Ni of the touch points in the certain subarea is larger than or equals to the lock threshold Nlock.