The one and very important requirement for this feature to work in the presence of an AMOLED display. AMOLED displays consume less power showing this information on the sleep screen. This does not only consume less power but also looks better in overall look and feel. Also, read | 3 Ways to Install Notification Light on Any Android Phone
Steps to get Always on Display on Android smartphones
This free app shows some ads and some of the features are locked too. You can unlock all the features by paying as low as Rs 30 which is a real deal for the app that actually works. You can also unlock all the features for 5 minutes so you can try all the premium features before buying the app. Also, read: Top Three Ad-free Launchers for Android
Wrapping up
This is how you can get the always-on display on your smartphone despite the display type on your smartphone. There are more apps in the Google Play Store which you can try but this one is only available which is free of any bugs and glitches. You may also like: Top Three Ad-free Wallpaper Apps for Android