How to use laptop as monitor for Raspberry Pi

First you have to install and run x server on your laptop

• Windows
install xming (you can Google xming, then download and install it)
• Linux
use this code to install x server

 sudo apt-get install xorg openbox   

Then you have to connect the raspberry pi to your laptop
Click here to visit Connect raspberry pi to your laptop
remember to enable X11 forwarding on putty

use below code to start display server

startlxde  

now you can use laptop keyboard and mouse also working with raspberry pi