I would have told you to use LCD Density Modder, but using it on Midnote usually results on my phone freezing at the Samsung Galaxy Note boot logo.
You can use a root explorer to edit /system/build.prop ro.sf.lcd_density property. I set it to 240 and it's working on midnote. If you edit the midnote build.prop, you'll find this property repeated, you should remove the second one and leave the first one.
I HIGHLY RECOMMEND you to backup using titanium and CWM/Red-pill before you edit build.prop as your device might hang during boot as I explained and you'd have to boot to recovery and restore backup.
Sent from my GT-N7000 using XDA