Rono Hey there as well.
On the topic of LTPS LCD ~ recently, I have been investigating into this pheneomon as to why manufacturers are putting a constant flickering of 14khz flickering into mini-led and LTPS panels.
https://www.notebookcheck.net/Apple-MacBook-Pro-14-2021-M1-Pro-Laptop-in-Review-How-much-Pro-do-you-get-with-the-base-model.576665.0.html
This is in addition to PWM or DC dimming,an additional separate layer of flickering of top of it. With OLED, I can understand their rationale. It was to prevent led screen burn-in.
Also — most peculiar of all, they have chosen to use square type(aka pulse) waveform, which is probably the most aggreviating perceived flickering among the 5 types of flickering. Sine type or Sinusoidal is the smoothest type btw. Most ppl have the least complain with this dimming.
So I was reading a study on waveform types and how it cognitively affects our perception. Assuming they have the same flicker modulation depth, we would perceive square wave as the worst flickering, while sine wave to be alot better. Do note that both are the same lowest/ highest depth.
I later read that there is a correlation between how we perceive screen contrast and the harshness of the flicker. Apparantly, in a square type waveform we are more likely to percieve the screen to be extremely contrasty and vibrant than it actually is, as compared to etc Sine.
This is perhaps the direction the mass majority of content creators on youtube are advocating on. To have better contrast and vibrant colors without the over saturation. No high contrast and vibrant colors? No buy.
Hence you will now see why Samsung is so obsessed with PWM and flickers, and even go out to put them into their LCD panels. Their marketing dept appeared to have nothing better to do daily than to search youtube everyday monitoring what other content creators are talking about. Apple and Google are following this trend hence it is unlikely they stop this .
So bottom of the story. How to know if a phone has a high frequency square type waveform? Just pay attention to how your body respond and what it tells you. If you found that the screen is very contrasty for some reason, and no matter how you try to dim the brightness and it still appeared really contrasty, it suggest high frequency PWM with square waveform.
All these are ultimately illusion to distort our perception anyway.
Unfortunately or fortunately for us, our body does not like or appreciate these and found them to be really unnatural and over stimulating.
Hence it responded by giving us eyestrain, headaches and migraine in an attempt to signal to us something is wrong.
It's logical as well.
Thus stay away from LTPS LCD and Mini-led. Though they stems from IPS LCD, they are not the evolution I would root for. A tell-tale sign of LTPS LCD is its ability to fit into a phone of very slim bezels. Secondly, they tend to have a hole punch for front camera rather than a notch.
I am not going to add on to with devices to recommend since the previous comments have given an excellent reply above. If you are really desperate, the Oppo a17 which I am also using now is really comfortable to my eye. Akin to my current iphone 7 Plus which I (stubbornly) refused to retire.
I am also using a Vivo Y35 for media consumption and PWM testing purposes. I wouldn't use it for reading though. There is some constant subtle flickering going on (despite being IPS LCD) and it is quite evident when I use the lower end Vivo Y16 which felt really comfortable like the Oppo A17.
Oppo A17 has the better camera but vastly inferior storage type (eMMC 5.1. Really? what year we are living in? Android Donut version 1.6?) but Vivo Y16 has the better ufs 2.2 which should last you to 2 to 3 years.
Vivo LCD are really a hit and miss by models but I found that (in general) their worst LCD are still better than Oppo's many mediocre range of LCDs.