Panel manufacturing question

Nicholars

Gawd
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Jan 10, 2012
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The manufacturer eg. Asus, BenQ etc. uses a panel for example AUO, LG etc.

Does the panel from AUO, LG etc. include the backlighting? Or is that added by the monitor brand eg. Asus, BenQ etc?

Just wondering why the Asus MG279Q measures about 10% higher contrast than the Acer XB270HU, they use the same panel and same coating...

Is that likely to be panel variance / different revisions of the same panel, as the reviews were ~6 months apart...

Or is it possible for manufacturers eg. asus, benq etc. to increase the contrast of the same panel ?

Not sure if I should get the Acer now, or wait for the Asus PG279Q if it is likely to have better contrast? I know it is not a lot but with IPS screens any extra contrast is good.
 
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The contrast ratio of an IPS panel can be as low as 500:1 and as high as 1200+
For some high-end series, brands like HP pay more to ensure that no panel has a CR lower than 900:1 for exemple.
Of course this is not the case with ASUS, an ultra low monitor brand like Acer etc.
If you want high contrast IPS, LG.Display are now offering higher contrast ratios panel 1400:1.
 
The contrast ratio of an IPS panel can be as low as 500:1 and as high as 1200+
For some high-end series, brands like HP pay more to ensure that no panel has a CR lower than 900:1 for exemple.
Of course this is not the case with ASUS, an ultra low monitor brand like Acer etc.
If you want high contrast IPS, LG.Display are now offering higher contrast ratios panel 1400:1.

I think you are missing the point of my question... Are you saying that the same panel from the same manufacturer can vary from 500-1200:1? I don't think it is THAT bad... but maybe a 10% variability.. The panel in the acer / asus is about as high as it gets currently for IPS...
 
This is something that interests me as well. In some cases it's down to piss-poor controllers that just change colour intensity instead of backlight when brightness settings are changed. This is evident is monitors where the contrast drops as the brightness setting is lowered.

That's not the case in the monitors OP mentioned, though, since according to tftcentral the contrast stays ~the same on the whole brightness range.
 
I looked at some more recent reviews of the XB270HU and they all measured 1150:1 which is almost no different to the 1220:1 on the MG279Q...

But for some reason the TFTcentral review from 6 months ago the contrast was worse... Maybe it is different revisions of panel or he got a bad screen... No idea why else it would be different as the panels are the same.. Unless someone can tell me why,
 
Actually, who ARE the big panel makes on the market now? Specifically for monitors?


I know Some.

LG - korean
Samsung - korean
AUO - chinese.. Taiwanese?

NEC - japanese - ... are they still big players? never see them around anywhere

Does BenQ make its own panels?

anyone else in the pc monitor space? I know sharp makes panels for phones... I think


I thought pretty much ALL of the following were using OTHER manufacturers panels:

i.e.
hp
dell
asus
acer


What happened to viewsonic? Do they still make their own panels? did they ever? I swear, we need MORE panel makers, I know vizio did it for their tvs, we need more players for monitors, so a fire can be lit for some oled monitors.
 
Samsung display, LGD, AUO and CMO produce most monitor panels. BenQ is an AUO brand. LGD is still on top for performance models.

Panels have an integrated backlight and may or may not come with a backlight controller.

The native white point determines the contrast ratio in addition to panel developments. If your backlight is 5800 K and you require 6500 K, your contrast is going to drop.
 
Back in mid to late 00's was repairing laptops for Toshiba, everything was either LG or Samsung for the TN panels.
 
Samsung display, LGD, AUO and CMO produce most monitor panels. BenQ is an AUO brand. LGD is still on top for performance models.

Panels have an integrated backlight and may or may not come with a backlight controller.

The native white point determines the contrast ratio in addition to panel developments. If your backlight is 5800 K and you require 6500 K, your contrast is going to drop.

Ah right so the "bottom lit LED backlight" on the AUO 144hz 27" 1440p AHVA panel will be the same whether it is an acer or asus etc? Same backlight?

I was guessing that maybe the Asus had a better backlight (top and bottom) or something which might make the contrast slightly better....

Do you know what else would affect the contrast? The amount of voltage or something? I don't know why the asus screens measure slightly better contrast than the Acer... Maybe it is just panel revisions and good review samples I have no idea. Cannot decide which to get, and if the new Asus will likely have better contrast or exactly the same compared to a new revision of the Acer!
 
Affecting contrast:

Light bleed, or poor sealing
Precision and accuracy
Programming of the LCD
Ambient light during measurement
Target white point
Uniformity correction

If I had to estimate the deviation of contrast for panels I would say 5%, which is fine. There are worse problems that make their way into final products.
 
Precision and accuracy of the contrast measurements.

Some manufacturers in the past have not necessarily used the full range of the LCD panel. An example would be where the OSD brightness setting clamps the LCD to dim the screen, rather than the backlight.

The main difference between products is their programming, so you ought to read as many reviews as possible to ensure you get a monitor that maximises the capacity of the panel to render accurate and responsive images.
 
you got it backward, AUO is under BenQ. :)

panel makers(most, except LG, samsung, benQ maybe few more) don't make the electronics.

Why eizo/nec cost so much? their electronics.

The best LCD tech arguably is from sharp.

monitor panel tech pretty much lags compare to phone/TV :(
 
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