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robertfrancis70

macrumors member
Original poster
Nov 10, 2012
57
37
Folks, I’m surprised no one has posted this earlier (although passing mention of it was made in an earlier post).

In January, Marco Arment reviewed the 30” Pro Display XDR on the Accidental Tech Podcast (episode 413) and beginning at 52:50, he explained how and why the same effect / issue appears on that display.

He describes it as “the really big downside” that he’s “slowly getting used to” and laments that almost no other reviewers mentioned it… He points to “Apple’s marketing page” as the source for his explanation (which I can’t quite do justice to — but I couldn’t find anything more about it on the Pro XDR page on apple.com…)

The “light fall off” in the 14 points at all edges on the Pro display, he explains, has to do with the fact that the screen tech here involves “overlapping adjacent cells” and at the edges of the display, the cells have no adjacent cells to overlap with, hence the drop-off of light. “There is no ability to team-light [those] areas.”

Check it out if you’re curious. But I post this here to say to other buyers: this is a feature of the XDR iPad that is not unique to the model in your hands (or the one on its way to you). There is no better model waiting for you if you go back and return yours. And it won’t be solved by a software update.

In a certain way, this is disappointing — so much hype around this display, the extra cost, etc (all points Marco also makes about the Pro display, by the way). But it’s somewhat relieving in the sense that it’s highly unlikely that in 2 months, you’ll feel burned by new models appearing that don’t have the shadow effect on the edges.

If the Pro had this 6 months ago and it’s still a part of Apple’s XDR display tech, it’s likely to remain a part of it until at least the next gen…

(Thanks to the poster who pointed me to the Accidental Tech episode!)
 
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CRAKZOR

macrumors newbie
May 22, 2021
10
5
update that increase brightness of edges wouldn't fix it?

**for white backgrounds
 

robertfrancis70

macrumors member
Original poster
Nov 10, 2012
57
37
update that increase brightness of edges wouldn't fix it?

**for white backgrounds
That might work… but if they were going to do this, wouldn’t they have done this out of the gate on both the Pro display and the 12.0?
 

Mcckoe

macrumors regular
Jan 15, 2013
170
352
It has to do with the layout of the LEDs…. 10,000 in fact, spread across ~2500 zones in groups of 4. The edges look darker because each group of 4 LEDs only has 2 LEDs along the edge space in every zone. (no matter how bright the zones on the edge get, they will always seem duller than the neighboring zones; because they don’t have a surrounding zone to fill in gap the dulled area created by the layout)

LED|||LED|||LED|||LED|||
|||LED|||LED|||LED|||LED
LED|||LED|||LED|||LED|||
|||LED|||LED|||LED|||LED

To be honest the human eye doesn’t look for detail outside of direct viewing range (~3-6 words wide), once your using the screen you stop noticing it, however whenever you look to the outside corners to check the time or battery life, it is brought into your direct viewing range, and it again gets picked up by your vision.

Because of this, you most likely won’t notice it while viewing/working with Video or Photos.

Productivity use will be noticeable, and OLED purists will scowl; but, it is a solid screen, and really mini-LED was the only way to get true HDR into a tablet at any reasonable Apple price.
 
Last edited:

robertfrancis70

macrumors member
Original poster
Nov 10, 2012
57
37
It has to do with the layout of the LEDs…. 10,000 in fact, spread across ~2500 zones in groups of 4. The edges look darker because each group of 4 LEDs only has 2 LEDs along the edge space in every zone. (no matter how bright the zones on the edge get, they will always seem duller than the neighboring zones; because they don’t have a surrounding zone to fill in gap the dulled area created by the layout)

LED|||LED|||LED|||LED|||
|||LED|||LED|||LED|||LED
LED|||LED|||LED|||LED|||
|||LED|||LED|||LED|||LED

To be honest the human eye doesn’t look for detail outside of direct viewing range (~3-6 words wide), once your using the screen you stop noticing it, however whenever you look to the outside corners to check the time or battery life, it is brought into your direct viewing range, and it again gets picked up by your vision.

Because of this, you most likely won’t notice it while viewing/working with Video or Photos.

Productivity use will be noticeable, and OLED purists will scowl; but, it is a solid screen, and really mini-LED was the only way to get true HDR into a tablet at any reasonable Apple price.

Mcckoe — you are the boss! This was awesome!!! Thank you so much.

This explains why they couldn’t avoid the problem by going past the edge.
 
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Mcckoe

macrumors regular
Jan 15, 2013
170
352
Mcckoe — you are the boss! This was awesome!!! Thank you so much.

This explains why they couldn’t avoid the problem by going past the edge.
My diagram isn’t perfect(because the LEDs are layered into those empty spaces), however, this design allows more light output and better contrast. The downside is the dimming effect around the edge. The simple solution is to extend the design beyond the edge, but with 4 LED zones you’d than have bleeding from the edge. It is just a problem with Mini-LED that hasn’t been solved, and might not be. Splitting the zones along the edge into 1x2 and 2X1 zones instead 2x2 zones and doubling the Light output of the edge, could solve this; but, that is a very expensive solution, and you would most likely develop the same effect over time, as the edge LEDs would wear faster than the center LEDs.
 
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GMLP

macrumors member
Sep 23, 2014
31
15
Down Under
That'll be a feature in the 2022 model.
I sure hope not. Didn't the rumour mills said OLED would be implemented on the cheaper model (s) next year? I would like to think Apple will leave this current M1 Gen a bit longer like the 2018-2020 incremental upgrade.
 

mabaker

macrumors 65816
Jan 19, 2008
1,215
580
Are there any pictures that we can see and compare? On my older 2019 iPad Pro 12.9 there are also issues with light ever so slightly fading away at the edges.
 
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