Quote from: Hanzzz on August 13, 2021, 15:29:39
Here is the same panel, the same part number
laptopmedia.com/review/lenovo-legion-5-pro-16/
no PWM
What is going on?
Laptopmedia lie.
All lcd panels in real world have programmable PWM unit
Quote from: Sasha on August 13, 2021, 15:18:54
Can somebody explain why the display specification from Lenovo says "DC dimmer" but the test shows a constant use of PWM with 14700 Hz frequency?
I thought DC dimming meant that PWM is not used?
All panel in world use PWM brightness control unit. The frequency is adjusted at the factory according to the decision of the R&D department.
Operating frequencies are usually chosen for mercantile reasons. The more often the LED is on, the faster they dim and fail. In addition, the more difficult it is to control the brightness over a wide range (on high frequencies). Thus, manufacturers often program very low frequencies in order to increase the lifetime of the panels.
And on AMOLED, low frequencies (which is generally hidden(hushed up) by this amoral industry, so that there is no public scandal about harm to the eyes, especially of children) is a necessary measure. At a high frequency (diods work more often on than off), OLED burns out many times faster or there is a rapid color imbalance. That is why you will never find an AMOLED panel with frequencies higher than 300Hz, in practice it is 100-200Hz. For example, in Apple iphones, it generally comes to shame with 61Hz(!), which people with a fast nervous system see and will suffer greatly from this... There is no global scandal with low-frequency PWM in the world for the simple reason that the majority of the world's population has an extremely inhibitory nervous system and for this reason, the harm caused to the eyes and the human nervous system for such people is minimal and accumulates for a long time (like about harm from cigarettes or low, but increased radiation level).
Tobacco companies have previously assured that there is no harm from smoking. Now cellular immoral manufacturers (while blatantly violating, as it turned out, the limit tolerances for real SAR radiation, similar to the immoral Volkswagen with "dieselgate" exhausts), they do the same and assure that there is no harm to people (although in all decent user manuals it is written in black and white that a cell phone should keep at least 1.5-2cm to the tissues of the body, which, 99.9% of the population regularly violates this requirement, thereby gradually causing irreparable harm to their health). And in the same way, manufacturers of panels for monitors and laptop/smartphone, those that allow low frequencies during development, in fact, deliberately and immorally destroy the health of the world's population, causing irreparable slow harm, especially to the eyes and nervous system of young people...
p.s.аnd DC dimming is based on narrowing the dynamic range of liquid crystals, i.e. affects picture quality and color depth.
I am personally very disappointed with the quality of the Legion 5 Pro series panels. Not only is 2560x1600 a crazy resolution for a gaming laptop, much better when set to 4k / 120Hz (as HP now puts in the new Omen 2021), which is 100% integer compatible with 1920x1080, i.e. at low fps, you can play in 1920x1080 without losing the sharpness of the picture, as it will be at 2560x1600-> 1920x1200, so also the native contrast for this series with an increased price is shameful only 1000: 1 with a small, although at least 2000: 1 was expected, as in smartphones with IPS.
Most people sitting behind them for hours are much more important than a high native contrast in text and surfing, and not 500 nits of brightness, which is absolutely not needed indoors, and 99% of those who bought it will not use it intensively on the street, besides, the reviewers of this site set it low a point for the durability of the case, which puts an end to using this notebook outdoors in a casual environment. The score must be at least 92% for this to be possible. The motherboard, unlike the L + series in the Thinkpad, is not mechanically reinforced inside. There is only one point in the aluminum case in this series - marketing considerations, because they killed the ability to remove heat from the entire case by making plastic overlays for the keyboard.
And the keyboard has a flaw - the Fx function keys are greatly narrowed in height, which does not make it possible to comfortably use them in touch typing.
Moreover, the models themselves on the 5800H (on the 5600 are slightly better) are now completely meaningless - the Intel 11800H has the same performance, but unlike the poor AMD solutions, it has on board Thunderbolt 4.0 (USB4.0) 2 ports in the Legion Pro series and much more fast memory controller. Therefore, I do not recommend buying outdated AMD solutions if you have Intel with the i7 11800h that are close in price.
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