Blur Busters Forums

yehaw wrote: ↑

30 Jan 2022, 22:54

I thought it was glow to be honest. So in theory would a pressure spot on top of IPS glow give the impression of worse IPS glow, giving the false impression of improvement to glow if the pressure spot cleared over time? I swear, the bottom right corner looks like a completely different monitor after a week and some days.

I remember thinking, my Dell IPS glow never improved, so that's why I had the intimal impressions of glow improving with break-in as BS in my post above.

That is correct.

With some panels, sometimes you have 3 superimposed multiple problems with the greys: Backlight bleed, IPS glow, and long-term pressure spots.

With other panels sometimes it's only 1 or 2 of these. It's luck of the draw, a lottery effect -- like a monitor being shipped freight cargo for weeks upsidedown or flat. Not healthy for pressure spots. Also, temperatures is sorta a fourth cause but it's in the same category as pressure spots (pressure spots fade faster at higher temperatures)

Also sometimes backlight bleed and pressures spots are sometimes caused by the same thing (metal enclosure pinching part of an edge too tightly), so they can sort of blend into each other -- but not necessarily -- can be separate causes -- backlight bleed can also be caused by loose bezels not sealing off the edgelight properly. And pressure spots can be caused by something else such as panel twisting or behind-the-screen bracket pressure, or a foam piece pressing against the screen, or shipping packaging one screen edge tighter than the other edge, etc. Shipping is very random, with some good shipping and some bad shipping, but time is the great equalizer for most mis-shipped panels.

IPS glow is generally a very distinct effect in part caused by the different viewing angle from your eyeballs to each individual pixel (IPS being a flat screen, with corners further away from the center of your vision) -- darker screen centre with equally brighter corners, in a symmetric manner when viewed perfectly center.

It's often hard to diagnose black nonuniformity issue, that's why most reviewers let monitors stabilize for a few days before testing. But some inexperienced reviewers forget to do it...

Chief Blur Buster wrote: ↑

30 Jan 2022, 20:27

Do not confuse non-changing IPS glow with changing pressure spots. Remember, pressure spots is like pressing a finger on an LCD. You can see how colors/greys distorts. When a monitor is packed, semi-permanent (24-to-72-hour) pressure spots can form because of monitor pressing against foam or a sideways shipping box causing the monitor stand to press against the LCD glass. Imagine holding a finger hard on the whole left edge of LCD for 1 week. Boom. Long-term pressure spot.

Do not confuse IPS Glow with pressure spots even though they can sometimes look identical

I thought it was glow to be honest. So in theory would a pressure spot on top of IPS glow give the impression of worse IPS glow, giving the false impression of improvement to glow if the pressure spot cleared over time? I swear, the bottom right corner looks like a completely different monitor after a week and some days.

I remember thinking, my Dell IPS glow never improved, so that's why I had the intimal impressions of glow improving with break-in as BS in my post above.

yehaw wrote: ↑

30 Jan 2022, 19:54

+ IPS glow has improved extremely well. I'll be honest, I thought the claims of IPS glow improving over time were BS, but it actually worked. The IPS glow is non-existant on my preferred settings now. I use to have crazy bad glow on the right side, from the bottom corner past the middle of the screen!

It is good to know that this issue is solved by simply burning-in the monitor for a few days.

Non-Corner Black Issues are NOT the IPS glow problem

The confusion is that there are THREE simultaneous problems with inconsistent blacks that can superimpose on each other concurrently.

1. Backlight bleed
   - This looks like bright splotches at the very edges
   - Always nonsymmetric/nonuniform.
   Cause: This is a loose LCD bezel not sealing the LCD backlight/edgelight fully. Often an RMA issue if very bad, although daring people have opened up a monitorand tightened up the metal besels around a LCD to varying successes/failures (warranty voided).
   .
2. Pressure spots/LCD fluid distribution
   - Often dark/bright splotchiness throughout an odd location on the screen, or screen center, or along a whole edge.
   - Usually nonsymmetric, sometimes can be uniform or nonuniform
   - Can improve over time, after freshly unboxing a monitor.
   Cause: Objects pressing against the screen, or the glass panel being twisted, e.g. during shipping or storage of monitor box. It pushes the fluid (liquid) of the Liquid Crystal Display, creating nonuniformities in amount of LCD fluid in different parts of panel, creating differences in some colors/greys especially in dark screens (blacks). It’s like a finger pressing on the screen nonstop for 24/7 and takes a long time for that long-term pressure spot to fade (days of warm-up). Except it was just a piece of foam/plasticwrap/etc or the weight of the screen itself while boxed-up and shipped in all kinds of bumps and wrong box positions, etc (keep monitors stored right-side-up!)
   .
3. IPS Glow
   - Does not change/improve over time
   - Always corners/symmetric when viewed head-on
   Cause: This is simply how IPS slightly changes contrast ratio when you view IPS off-axis. Much more visible if you view an IPS screen from up close, the corners become brighter, because when screen center is perfectly perpendicular to your eyes, the corners are not perpendicular (often viewed 5 or 10 degrees off axis)

The newbie confusion is that (A)(B)(C) is simply non-uniformities in black.
The newbie confusion is that (A)(B)(C) are simultaneously happening
The newbie confusion is that (A)(B)(C) are mis-disdiagnosed on other mere mortal forums.

*** Public Service Announcement: When other forums/twitter mislead you, please correct them that this is not IPS glow, and permalink to a Blur Busters post like this ***

Do not confuse non-changing IPS glow with changing pressure spots. Remember, pressure spots is like pressing a finger on an LCD. You can see how colors/greys distorts. When a monitor is packed, semi-permanent (24-to-72-hour) pressure spots can form because of monitor pressing against foam or a sideways shipping box causing the monitor stand to press against the LCD glass. Imagine holding a finger hard on the whole left edge of LCD for 1 week. Boom. Long-term pressure spot.

Do not confuse IPS Glow with pressure spots even though they can sometimes look identical

Yes, this is IPS glow.

For panel defects (backlight bleed) or panel pressure during shipping (center splotches), photograph from 2+ meters away (zoom lens is OK) to eliminate IPS glow error margin.

(To fix pressure spots (center splotches roughly where the bracket connects), run a 72 hour burn-in nonstop 24/7 to redistribute the liquid crystal fluid between the glass layers. Monitors are often accidentally shipped flat or upsidedown, causing pressure on the LCD, like a finger pressing the middle of the LCD for days nonstop. This pressure spot can take days to disappear. But what I see from your pictures is just IPS glow).

Sitting dead center with the monitor tilted exactly perpendicular to your face, will add symmetry to the IPS glow (equal and fainter in all corners), especially if you sit at least arm's length away from dead center.

It's not as bad as TN in my experience -- TN is more viewing angle sensitive and worse than IPS glow but your mileage will vary (YMMV) depending on what kind of panel quirks you are picky about. TN, VA, and IPS have their own quirks.

SixelAlexiS wrote: ↑

27 Jul 2021, 15:05

Btw about the nonstop break in, do you mean just having a white image in fullscreen at max brightness for 72 hours straight?

For the 72 hour break-in:

Video or gaming or surfing whatever. Keep the screen busy continuously. Get the monitor as warm as safely possible, nonstop. This shakes out all the temporary issues as much as possible, while also verifying warranty fails earlier than later.

On LCDs, black heats up more (the powered color + absorbs more light). Heats up the monitor more than white (the unpowered color of most modern panels). However, that can automatically put the monitor into sleep mode, since a blank black screen is often a monitor's autosleep trigger.

Also, you want to exercise the pixels anyway for other reasons (early "new" dead pixels usually happen early after arrival, so exercising the monitor panel early ensures you "shake hidden warranty defects out of the tree" as early as possible, since more than half of warranty problems of nearly all products of all vendors happens during the first days or weeks of ownership)

Personally, I've never had non-BLB-based IPS glow that stayed asymmetric (e.g. massively worse on one corner) after a proper break-in was done. Any bad BLB I've ever had on IPS was always symmetric (evenly distributed) after the break-in, unless another defect was occuring at the same time such as a pressure spot inside the bezel mount or a tiny gap in the backlight seal at edge (backlight bleed). Break in ensures any remaining black-field (RGB 0,0,0) asymmetry is from other defects such as corner pressure spots and/or true, real, genuine backlight bleed rather than native IPS glow factors. That's why I heartily recommend all reviewers and users break in their monitor before judging the monitor, the LCD GtG speeds up + the shipping pressure spots disappears. Obviously, it may still be asymmetric (asymmetric tightness of LCD panel mounting, whether by panel factory fault, or vendor bezel fault), but at least after break-in, it's no longer shipping-based pressure spot related.

You can just use the computer normally during the break in, just prevent the monitor from turning off. Just keep your computer on 24/7 for three days without a sleep-blackout. If you use a screensaver, use a very lively screensaver of some kind, otherwise, just run a 16:9 video loop.

If you can't keep it on continuously (e.g. bedroom monitor), you can spread the break-in over more days but it'll take longer (like 1 week of 12 hours per day) because of all those cool-downs, watch your RMA window.

Nontheless, break-in is routine at most monitor reviewers (RTINGS, TFTCentral, PCmonitors), they do that to warm up cold-shipped panels and shake out all those temporary shipping artifacts (pressure spots) out. The LCD fluid inside a LCD glass sandwich flows all around -- it's a Liquid Crystal Display.