Thinkpads Forum

http://www.notebookcheck.net/Lenovo-Thi ... 028.0.html

Compared to the rivals from HP and Dell, which mange more than 350 cd/m², Lenovo is very far behind. The display can at least convince with an even brightness distribution, and annoying backlight bleeding is no problem.

The display backlight flickers at 220 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 90 % and below.

QHD! Not WQHD. Why does everyone get it wrong nowadays?
*not reading review because those amateurs cannot even get the name of the resolution right*

Congratulations, you proved that idiots can also edit Wikipedia.

I tried to remove that abomination once, and my edit was reverted as "suspected trolling".

QHD is the only name that makes sense, because it is Quad HD (which is 1280x720), which is already a widescreen resolution. The "W" is there only to impress morons.

There. It's better now. Let's see how long it lasts.
https://en.wikipedia.org/wiki/Graphics_ ... 60x1440.29

You can´t really blame Notebookcheck for calling that resolution WQHD, since thats the name Lenovo has for this resolution, see the PSREF.

There doesn´t seem to be a clear standard on the naming of resolutions anymore. 2560x1440 is also often enough called 2K, and the 2880x1620 Lenovo offers in various 15" Thinkpads like the T560 is also sometimes called "FHD++" but most of the times "3K". The same goes for 3200x1800, which is sometimes called 3K, but often it is called "QHD+".

Well, the issue with low PWM frequency in the whole brightness range remains. It must be a Lenovo BIOS/driver specific issue because it affects multiple recent ThinkPads, especially those hi-res 3K and 4K displays.

Older ThinkPads also use PWM. The only thing that has changed recently: Notebookcheck started testing if PWM is present. I doubt that it is connected with the BIOS.

Ibthink wrote:There doesn´t seem to be a clear standard on the naming of resolutions anymore.

I know, I know. It's just bloody annoying for pedants, hence the rant.

Ibthink wrote:Older ThinkPads also use PWM. The only thing that has changed recently: Notebookcheck started testing if PWM is present. I doubt that it is connected with the BIOS.

All displays use PWM, the difference is the poor implementation in displays Lenovo use compared to the competition.

Dell XPS 15 9550 http://www.notebookcheck.net/Dell-XPS-1 ... 462.0.html
15.6 inch 16:9, 3840x2160 pixel, 10 fingers, SHARP LQ156D1JX01
Screen flickering / PWM not detected

Asus ZenBook Pro UX501VW http://www.notebookcheck.net/Asus-ZenBo ... 762.0.html
15.6 inch 16:9, 3840x2160 pixel, 10-point capacitive, IPS, ID: LGD04D4, Name: LP156UD1-SPB1
Screen flickering / PWM not detected

MSI WS60-6QJE316H11 Workstation http://www.notebookcheck.net/MSI-WS60-6 ... 105.0.html
15.6 inch 16:9, 3840x2160 pixel, SDC424B
The display backlight flickers at 1316 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 40 % and below.
The frequency of 1316 Hz is quite high, so most users sensitive to PWM should not notice any flickering.

HP EliteBook 745 G3 http://www.notebookcheck.net/HP-EliteBo ... 278.0.html
14 inch 16:9, 2560x1440 pixel, IPS panel
Screen flickering / PWM not detected

Gigabyte P34W v5 Xotic http://www.notebookcheck.net/Gigabyte-P ... 665.0.html
14.0 inch 16:9, 2560x1440 pixel, IPS, Name: LG Philips LP140QH1-SPB1
Screen flickering / PWM not detected

Schenker XMG U716 (Clevo P775DM1) http://www.notebookcheck.net/Schenker-X ... 740.0.html
17.3 inch 16:9, 3840x2160 pixel, AU B173ZAN01.0 (AUO109B), IPS
Screen flickering / PWM not detected

As you can see, no other vendor use such low frequency (~200 Hz) for whole brightness setting range (0% to 90% or more) as Lenovo models do. Still not convinced there is something wrong with Lenovo displays ?

No. There are displays without PWM (like the LG IPS display in my P50).

Ibthink wrote:No. There are displays without PWM (like the LG IPS display in my P50).

No, all displays use PWM to control brightness, your display just don't have such bad implementation using noticeable low frequency.

Anyway see my previous post, Lenovo have the issue on higher than FHD resolution displays while others don't.

dr_st wrote:QHD is the only name that makes sense, because it is Quad HD (which is 1280x800), which is already a widescreen resolution. The "W" is there only to impress morons.

"WQHD" should correspond to 3440x1440, a wider (approx. 21:9) version of 2560x1440 ("QHD"). I have been tempted quite a few times to buy a 34" 3440x1440 monitor, but luckily was able to resist the temptation.

IMO, there are now so many different resolutions that it's much better to state actual numbers and avoid acronyms completely. In the old days, only about a dozen resolutions were widely used (VGA, SVGA, XGA, SXGA, SXGA+, UXGA, QXGA, WXGA, WXGA+, WSXGA+, WUXGA, WQXGA) and so acronyms were much more manageable.

BTW, 1280x800 is WXGA. HD is supposed to refer to 1280x720, though for computers and TVs, it's usually 1366x768 instead; it seems that only smartphones actually use 1280x720.

pianowizard wrote:BTW, 1280x800 is WXGA. HD is supposed to refer to 1280x720, though for computers and TVs, it's usually 1366x768 instead; it seems that only smartphones actually use 1280x720.

It is my mistake of course. 2560x1440 is exactly 4*1280x720. 4*1280x800 is WQXGA = 2560x1600.

Hello,

in some T460s and T460p are Panasonic Panels with PWM and lower brightness than 300 nits (about 270)
and in others are LG Panels without PWM and a higher brightness (about 300)
Its like poker what panel you get if you order!