AMD Continues Working Toward HDR Display Support For The Linux Desktop

[Anux]

No miniled and microled are different technologies. Miniled still has a single layer of LCD. MiniLED is basically TFT-LCD with LED per pixel backlight. MiniLED does manage to best dual layer LCD.

https://www.kla.com/advance/innovati...g-for-displays

Ah THX, didn't know that. MiniLED with quantum dots could be a payable middle ground though.

[oiaohm]

Colour accuracy is where dual layer LCD shine. It can provide high quality display that stay accurate throughout its lifetime, unlike OLED or micro LED or mini LED, which need to build in extra calibration equipment inside to stay anywhere close. Non-organic LED is more durable than organic LED but its brightness still isn't perpetually constant when aged. Traditional backlight eliminate such worry because one can tune the overall colour temperature when drifted too much, and we are used to colour temperature / brightness / contrast drift by environmental lighting / reflection and compensate that by our brain. But for OLED / mini LED / micro LED, they are drifting locally in many paces.

Sorry you just wrote a myth. There is a base in truth.

How does a LCD go colour incorrect vs how microLED go colour incorrect is important to understand.

LCD first way it goes incorrect is the backlight. Yes the Fluorescent of old and LED backlights of new as they age don't maintain colour constancy. But the error is a gradient. This one of the reasons why LCD single or dual you are checking multi locations on the screen when you are confirming calibration to check that the backlight is still good. Yes there is a magical idea that Traditional backlight eliminated the problem by being tuned to one color but that is not the case tuned to one color just means you have gradients not a step cliff.

Next is the LCD it self the liquid crystal is also suffers from degradation. Good/bad part again this is normally a gradient degrade. So if one pixel in a LCD is highly degraded the near by pixels will also be slightly degraded and so on making gradient effect of loss of calibration.
Again this is why you must when calibrating LCD check multi points on the screen there is a defined number of points for DUAL LCD screens to be checked to fairly sure that degrade is inside acceptable limits still.

There is a catch here gradient degrade is not in face.

MicroLED lets say it same amount across the screen out of calibration as the Dual LCD that human cannot notice that Dual LCD out the reality is human will absolutely notice that the MicroLED is out. Why because this will not be gradient. What will have happened is a pixel will be out and b pixel right next to it will be absolutely the right color. This is the nightmare of MicroLED calibration has to be per pixel. The nightmare also the advantage of MicroLED its out human sets screen to flat color and its absolutely clear its out due to the way MicroLED goes out of calibration.

Oled has durability problem.

Mini-LED due to having LCD layer end up have the disadvantages of MicroLED and the issue of liquid crystal in one.

need to build in extra calibration equipment inside to stay anywhere close.< this is not true. MicroLED and Mini-LED and pro quality OLED have extra tuning circuits that you can adjust each pixel individually. Calibration for MicroLED, Mini-LED and OLED is a rig that sits in front of the monitor and tracks across it checking pixel by pixel that updates the calibration in the monitor. If you cannot guess this rig is not cheap. This rig is usable with all monitors. Yes it faster on your old school LCD because you don't need to be checking every pixel. There are consumer Mini-LED and OLED that don't have the extra tuning circuits inside. OLED have turned out to hold their calibration inside specification fairly much inline with dual LED. The difference is where it comes human noticeable that it out.

Yes people get dual LCD screens that are appeared on the second hand market because they are being got rid of because they are no longer colour correct due to either backlight or LCD degrade. Not being colour correct does effect a professional using the monitor.
"colour temperature / brightness / contrast drift by environmental lighting / reflection and compensate that by our brain."

No this means professional user will not notice the problem so can make incorrect adjustments based on the out of specification monitor error.

The extra calibration equipment that people think MicroLED. Mini-LED and OLED unique is not. Turns out pro level Dual LCD also need per pixel adjustment hardware times 2 to be able to adjust for LCD degrade to extend dual LCD monitor lifespan in pro usage. MicroLCD and OLED you halve the correction circuits required compared to Dual LCD. Mini-LED same amount as Dual LCD but with the independent backlight degrade issue removed.

Big thing is MicroLED, MiniLED and OLED will all be more in face when they are out of calibration and require more involved calibration process to get them back in usable calibration. Yes one of the nightmares of MiniLED is that doubled up calibration hardware the same nightmare of dual LCD.

Please note per pixel from here on differ RGB colours invidiually counted as pixels and group of pixels are those in sets.
MicroLED/OLED and equal techs 1 calibration circuit per pixel.
MiniLED is 2 calibration circuits per pixel.
Zoned backlighting LCD is 1 calibration circuit per pixel + 1 calibration circuit per backlight zone.
Dual LCD 2 calibration circuits per pixel or 1 calibration circuit per pixel and 1 calibration circuit per group of pixels depending on how the LCD screens were designed. With 1 adjustment for the complete backlight. Problem what do you do here if the backlight has come uneven in color right you are screwed if you cannot replace it.
Single layer LCD 1 calibration circuit per pixel and 1 for the complete backlight. Same problem .

Pro MiniLED, MicroLED and OLED can be quite a few times bought back to as new calibration without needing to change any parts. Problem is having a cost effective way to-do this as new calibration.

billyswong its a incorrect idea that there is extra circuitry need for MicroLED and OLED. MicroLED and OLED in the device has the least amount of circuitry for calibration in the pro devices. The problem is how the MicroLED and OLED go out of calibration since it in face and is clear the monitor is out of calibration and the cost in time bring them back into calibration.

Hard reality is the MiniLED you end up with both the problems of how LCD panels go out of calibration and how MicroLED and OLED go out of calibration so you have to perform the more expensive MicroLED/OLED calibration on them.

Only advantage at all with Dual LCD is reduce end user and factory calibration cost due to being able to do spot calibration not complete device. Question is that cost saving offset by having to replace the monitors backlight ever so often with risk breaking stuff to say in calibration or paying for new monitors or having you/your staff make errors because the Dual LCD was slightly out of calibration and no one noticed. MicroLED and OLED being in face when out of calibration is good and bad thing.

MiniLED might be out of calibration like MicroLED/OLED so most likely clearly noticed by the user or might out out of calibration due to liquid crystal degrade so out of calibration like LCD panel that is gradient that end user does not notice as simply. So you have most of the issues of the LCD and the Worst of the MicroLED and OLED solutions. Only saving here you don't have replace the complete backlight to bright the thing back into calibration. Due to using all the same type of LED in a MiniLED uniformity of production is simpler to pull off so at factory making MiniLED displays when new they can cheap out factory calibration. Fun part this does not mean end user can cheap out on calibration after a few years. End user MiniLED recalibration cost in time per calibration will work out the same as MicroLED or OLED recalibration but this re-calibration can mostly get the device back to what it was like new.

billyswong welcome to the devil of trade offs. You might be right for normal consumer Dual LCD might be good but the extra cost of production is not going to go over well with the normal consumer. Pro users need true colour correct and when it not correct and they don't notice costly bad things happen are most likely the better choice MicroLED and Oleds Remember a miniled is also still less parts to make than a Dual LCD. This horrible leaves DualLCD without a market.

Yes it would be wacky to have a town service center for monitors/tv where people drop their tv and monitors of to have the 4 to 5 year re-calibration. This would be possible if monitor vendors were interested in repair. Unless you either have lots of monitors or are doing stuff that colour is critical personal owning the calibration gear for MicroLED is not worth it. Spot calibration gear for LCD include Dual LCD costs less than 500 dollars total device calibration gear for QLED and MicroLED and MiniLED is at least 50000 that is not miss calculation its 100x more expensive and that is if you got more advanced calibration gear cheap and second hand. Yes I just did a totally unfair compare the 500 dollars was new and the 50000 was for second hand still well behind. Yes the calibration gear is worth more than the Monitor with QLED, MicroLED and MiniLED.

Hopefully calibration gear for total monitor surface calibration will come down in cost.