Is there any way that can EXTEND (not mirror) my phone screen to another phone? Half-Half

Just want a bigger display for my phone. I need to know how I can EXTEND my phone's screen to another phone, by using Bluetooth or WiFi or RF or web? Few apps (iDisplay, AirScreen, AirDuet screen, etc) exist for only mirroring/sharing the screen - but not extending it. It's like using two monitors for your PC side-by-side & you select 'Extend display' between two monitors and hence the display bisects into two monitors. Same principle to phones.