DisplaysShouldNotBeTVs
That’s an interesting one! Up until now, I honestly thought most panels made after 2015 were basically cursed. But it really seems like the biggest issue isn’t always the panel itself – it’s the signal being sent to it. At least for me.
So far, I’ve mostly tested IPS panels. I think one of the newer laptops I had (with Intel Iris XE) used a TN panel, but back then I didn’t realise how much of a difference “dumbing down” the signal could make. The exact same panel, when used through internal eDP versus something like VGA or even a stripped-back HDMI signal, can feel totally different. I ended up selling the laptop without knowing what I was actually missing.
Your screen being TN is really interesting too. Do you generally find TN more comfortable than IPS, or is it more about how the signal is delivered regardless of panel type? Also, I looked up the B140XTN02.D: looks like a proper 6-bit panel with no FRC? Any ideas what that "something" is that gives you strain when connected directly to Windows? Dithering? Does it start "sparkling"/"shimmering" visibly or via slow-mo camera or is it more invisible stuff?
As for controllers, with eDP, especially older panels, options are limited due to the fact it has to be programmed specifically for that panel. I'm not aware of any universal ones as of now. I usually pick ones with VGA input, since it gives me a cleaner, simpler signal. The feel is very close to my known-good laptop setup, so I consider it safe (for me at least). Whether I’d recommend it to others... hard to say. I’m not super sensitive to OS or driver updates. PWM gives me regular eye strain, like it does to most people. So it seems the bigger issue for me has always been signal processing or dithering and potentially some bad LED backlight. Here's one of the boards I’ve used:
https://www.aliexpress.com/item/4000556723051.html
One more thing. Lately I’ve also started looking into LVDS-based panels again. From what I understand, LVDS is a simpler protocol compared to eDP, and there seem to be more high-quality universal controller boards for it (like Novatek or Realtek chipsets). Still trying to find the right panel for testing. Ideally something true 8-bit, running over LVDS with a fully “dumb” signal path. A bit rare these days. Also, LVDS panels often need manual backlight wiring – but many support analog or DC dimming instead of PWM, which could be a huge plus if implemented right.
Curious:
Do you have any experience with LVDS vs eDP?
Also, what kind of controller have you been using with your panels?
Have you tested with VGA input directly, or maybe tried a hardware EDID emulator?
And have you ever used an older DisplayLink adapter with legacy drivers to bypass signal processing?
Seems we have similar symptoms and experiences so would love to know what’s worked for you in more details. I'll share my new findings after the next round of testing too.