Phone Screen Pixelation and "invisible" LED flashing?

Hardware Librem 5
1

Published specs: 5.7″ IPS TFT 720×1440

  1. Presuming the screen is 3” x 6”, that’s 240 ppi, low for a modern phone. Do you notice pixelation?
  2. Many modern screens use LED micro flashing to fool the eye into seeing more colors that it can otherwise produce (this is how Apple/Google achieve it). Any input, issues you’ve experienced, especially if you are sensitive to Apple/Google screens?

One the one hand, pixelation may be tricky on my brain (I’ve brain injury and resultant screen sensitivity issues (I use an e-ink monitor on my desk), on the other, simpler older style screens worked just fine for me, so any and all input appreciated (all input is naturally highly based on personal experience, your mileage may vary caveat, et al).

Answer: Uses DC dimming (no flicker), No temporal dithering (no flicker), and LCD not LED: so those flicker sources are not present. Update: addressing the IPS TFT (a-Si TFT contributes to flicker), Proton’s artificial stupid says: “With DC dimming and no temporal dithering, an IPS TFT display is effectively flicker-free“.

Here’s a detailed explanation of screen flicker issues:

https://daylightcomputer.com/blog/screen-flicker-101

2

It’s a high DPI screen where it’s possible to see the pixels if you really try, but it’s not something noticeable at typical viewing distances.

There’s no temporal dithering being used and the backlight is driven by adjusting output current rather than using PWM, so there’s no rapid blinking there either.

1 Like
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Beautiful! That’s the jargon I was hoping for but can’t remember the details of to ask in detail. Thank you @dos !

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Do you happen to know @dos ?

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Possibly related, I always felt I could see the tiny cells surrounding each pixel on Liberty phones but not on standard Librem 5 basic 3GB RAM model made in china. On my old one the screen seems to flow together with no visible lines between pixels

Are those the results of hardware differences or some kind of setting do we think?

[moderator clarified text]