I've managed to get my hands on a Chinese app that was developed for Oneplus users to have the best ALWAYS ON DISPLAY. It works like charm with a Now playing, Dash charging indicator functionality and also displaying contents of your notifications. It replaces the Ambient display provided by Oneplus with this new one. I've not noticed any battery drains using this app. I'm on latest OPEN BETA 14.
Here are some samples i've taken:
I've been using this for the past 3 days and so far i am impressed. The AOD is working perfectly.
I used a substratum theme to make the in display fingerprint black because that is the only thing which stays still.
Here is the apk v2.5: https://www.coolapk.com/apk/com.retrox.aodmod
The app is in chinese language. You might make use of these screenshots to configure it (I don't see any settings that needs to be changed though):
Else, you can use this app translator to change default chinese to english. the app is restricted to number of words that can be translated. You will need to login with email or phone number to use the app.
Hopefully, those who wanna give the app a try, will like it.