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iFixit Shares iPad Mini 7 Teardown, Adds Mystery to 'Jelly Scrolling' Fix

"The website concluded that Apple has done some unknown "trickery" to reduce "jelly scrolling," so it still remains unclear exactly what Apple has done to mitigate the issue."

And that is because the issue is indeed NOT mitigated. At all in my experience/observation.
 
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klasma said:
The pixels within an LCD panel (i.e. the actual “liquid crystals”) are not refreshed all at once for each new picture frame, but instead are refreshed line by line. This means that if you take a snapshot of the panel while it refreshes from one frame to the next, some of the pixels will show the new frame while others will still show the previous frame.
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To follow up on my post above, here is a camera shot I took of the mini 6 display while scrolling a forum thread:

1730064430120.png


Looking at the pink lines in particular (I was using Smart Invert Colors at the time), you see that one frame is fading out while another is fading in, from left to right. That’s what causes the slanted appearance of the lines in motion.

There are actually three frames visible at once here. I’m not sure if slow pixel response time can cause this, or if it’s due to the camera’s exposure time.
 
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bzgnyc2 said:
Back in the CRT days, we had something called double buffering to avoid the equivalent on those types of screens. To the extent that today's hardware/software no longer supports double buffering, I would be surprised. But then if it did it should have avoided this problem completely (iPad Mini 6 or 7)?

Even if not implemented for the iPad Mini 6, it should have been an obvious solution for this on the iPad Mini 7 with relatively incremental hardware requirements. But again if they used a solution like that then it shouldn't just be reduced but eliminated?

P.S.For stereoscopic 3D, we had quad buffering, which I would say was relatively more important as tearing during the projection of a moving 3D object would likely cause the 3D effect to collapse. The alternate cheap solution was to only refresh the screen during the vertical sync but placed quite the real-time rendering burden on the software.
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iPads generally use double buffering or triple buffering. More buffering makes it easier to deliver high frame rates but results in more input lag. The OS actually switches sometimes from triple buffering to double buffering when you start writing with Apple Pencil in order to reduce that lag. Most games use triple buffering so they can overlap CPU processing from one frame with GPU processing from the previous which prevents CPU from waiting on GPU or vice versa and also smooth out stalls to deliver consistent frame rates.

I’m not aware of any software these days which does not at least use double buffering. Otherwise you might start presenting frames of animation which aren’t ready and that doesn’t seem good at all …
 
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turbineseaplane said:
Anybody saying jelly scroll doesn’t exist is simply not sensitive to it.

It is there on 100% of the units

It is something on all LCD displays to varying degrees and direction depending on how they are implemented

I have jelly scroll on my iPad mini 5 that I’m typing this on, but it is oriented for the landscape direction and I never personally notice it because it’s happening all the way on the far right side of the panel.

The physical distance from one side of the screen to the other is what mitigates it as a concern for me on this device. What makes it so bothersome for many of us on the 6/7 is that the jelly is occurring in the portrait orientation, which is physically a very short distance.

The most accurate thing somebody can say is that jelly scroll is not something they notice or they’re not bothered by it, but it is totally inaccurate to say your device does not have it
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Really? 100%. That's a lot of testing.

I'll go with my own critical observation that it isn't. Which is corroborated by Dan's testing for MR, and other people here that actually *own* and have been *using* a Mini 7.
 
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A complete non issue to most iPad mini users. I’ve had multiple iPad mini and larger iPads and yeah I can see it if I look, but it doesn’t bother me and I forget about it.

It’s a non issue for most and only seems to come up in detailed reviews and macrumors forums. That’s probably why they don’t do anything so major about it.
 
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I've never been bothered by it. The only thing I do with an iPad in portrait is read books and that uses the page turn animation rather than scrolling. What would I be scrolling rapidly enough to notice it with anyway?
 
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I wasn’t able to see it on my mini 6 unless I scrolled faster than I normally would in portrait mode. If YT revenue seekers have to save evidence in very slow motion to point out the jelly, that should tell you just how much of an overall non-issue it is for the user. MR is certainly not representative of normal users with normal expectations. If anything, this place can be a sounding board for the minority of extremists.
 
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Apple_Robert said:
I wasn’t able to see it on my mini 6 unless I scrolled faster than I normally would in portrait mode. If YT revenue seekers have to save evidence in very slow motion to point out the jelly, that should tell you just how much of an overall non-issue it is for the user. MR is certainly not representative of normal users with normal expectations. If anything, this place can be a sounding board for the minority of extremists.
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Spot on assessment. I don't see it on my Mini 7. OTOH, I'm not trying to scroll at a rate of 100+ lines of text per second. I'll try harder on getting my scroll rate up so I can join in with a good moan.

It's a mice-nuts iPad thing to latch on to, in order to stir up the pot for people who live to criticize Apple.
 
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citysnaps said:
Spot on assessment. I don't see it on my Mini 7. OTOH, I'm not trying to scroll at a rate of 100+ lines of text per second. I'll try harder on getting my scroll rate up so I can join in with a good moan.

It's a mice-nuts iPad thing to latch on to, in order to stir up the pot for people who live to criticize Apple.
Click to expand...

Mice nuts?

Is that supposed to mean "tiny"?
 
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klasma said:
To follow up on my post above, here is a camera shot I took of the mini 6 display while scrolling a forum thread:

View attachment 2442633

Looking at the pink lines in particular (I was using Smart Invert Colors at the time), you see that one frame is fading out while another is fading in, from left to right. That’s what causes the slanted appearance of the lines in motion.

There are actually three frames visible at once here. I’m not sure if slow pixel response time can cause this, or if it’s due to the camera’s exposure time.
Click to expand...
It looks like that: https://en.wikipedia.org/wiki/Interlaced_video ///but i think the GPU su**s. Maybe apple found out, that a change to a new display needs another GPU. And a new GPU needs a CPU plus new mainboard with more power; on and on... So they decided, fu** them, they buy it anyway...
 
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