If you've got a PlayStation 4, you can mow use your Android smartphone as a screen to play your games on this console thanks to PS4 Remote Play.
Play wherever you want with your PlayStation 4
For such purpose, the only thing you've got to do, apart from downloading the APK of this application, is connect your phone and PS4 to the same Wi-Fi network and with your DualShock 4 controller you won't need your TV screen anymore.
Had you ever imagined a portable PlayStation 4?
The effect will be equivalent to having a portable console... a portable PlayStation 4. But make sure you've got access to a high-speed wireless connection if you don't want to suffer from lags and delays.