Disabling the keyboard

Hello,

I just bought a Dell Inspiron 13 series 7000, a 2 in 1 (laptop and tablet pc). But, when I want to use it like a tablet, I have problems with the keyboard because it keeps active, i.e., as the keyboard remains active and on display I touch it so it accidentally types or active functions I don't want to active.

So I ask: how can I disable the keyboad in a way I could use the tablet function without accidentally typing?

Thank you!!