That is interesting about the display for the OnePlus 12. But the description of this single puls dimming mode looks like on Honor 90 and nothing new. Hopefully it will reduce modulation to a good level.
Yes, indeed. To be more specific, it is loosely based on the initial release of the Honor 90 (
hybrid dimming), instead of the revised
full dc-like dimming update.
@pwm away
I did more finding on this Single pulse dimming. As single pulse dimming does not appear to make any sense based on the machine language translation. I then traced it back to the original 单脉冲调光模式 name in mandarin.
As it is, the mandarin [单] initial character has multiple meaning. It can mean the following:
- Single (as in single-bed, single bedroom)
- Stand alone (as in by itself, independent of others)
(I do have some additional background knowledge in linguistic)
Thus in this context, it is likely that the character [单] is referring to being "stand alone", rather than being single. A "single" pulse dimming does not make any sense either. Stand-alone pulse dimming would be a more appropriate translation.
So I did even more findings on this dimming technique. Stand-alone pulse dimming is basically PWM (Pulse Width Modulation) dimming but without the "Width". Hence it became (stand-alone) Pulse Modulation dimming.
What this means in the real world is that the Duty cycle(of PWM) is being locked at a fixed flicker time duration ratio from 100% brightness to 0% brightness. However, modulation% will continue to increase when brightness decreases.
During lower brightness, the screen will then introduce additional hertz that amounts to a total of etc 1920 hertz. Now, this is not to say that the pulses are consistent at 1920 hertz. Rather, we continue to see the 120 hertz from the previous
bigger waves of the DC-like dimming, but now with the additional 1800 hertz
smaller waves introduced ~ to simulate a 1920 flicker hertz display.
So if you read betwen the lines of what I am suggesting above, you will probably understand what I am trying to imply here.
This feature is already available in the China release Oneplus Ace2 Pro btw.
To put in technical terms, it is not using Pulse Width modulation (PWM) but is using a modified version of Pulse Amplitude Modulation (PAM).
Note that the 2nd character in Pulse [_____] Modulation denotes the independent variable. In other words, what is the component that was directly adjusted.
If "Width" is the independent variable, it will be called "Pulse Width Modulation". (PWM). This is only the change in duty cycle, while the modulation depth is constant.
If "Amplitude" is the directly adjusted component, then it will be called "Pulse Amplitude Modulation" (PAM). This is only the change in modulation depth %, while duty cycle is constant.
Likewise, if the flicker frequency is the one being directly adjusted, it will be called "Pulse Frequency Modulation". (PFM)
Classic PWM changes only the duty cycle without touching the modulation depth. Thus classic PWM always have 99.9% modulation depth %. However, with technological advancements in screens panels, PAM has long been merged into PWM. (From what have I understood)
Modern PWM has resulted in higher duty cycle with lower modulation depth % on the highest brightness settings. The drawback is that we still do get the worst of PWM, aka the worst form of flicker ever in the history of mankind ~ as what I have learned during my discussion exchange with the researchers.
If duty cycle % is locked, it is no longer using classic PWM. Thus it has become PWM 0, PWM free. But the pulsing flickers from the high modulation in PAM remains.
I was actually quite hesitant in introducing these dimming method technique name to the community this early since not many have had a good grasp of what exactly is the PWM dimming technique.
Also, I hesitated because I considered my position of being further defamed and slandered with the daily allegations of "fake PWM education" and casting strong doubts. I can understand for those that might have struggled with earlier concepts, they may already have difficulty keeping up with the pace. Hence this is one of their defense coping mechanism to react with what they are already familiar with and used to in real life.
However, considering again what's beneficial for the community, I brought this up, nevertheless. The reason being that screen dimming method continue to change and evolve, faster than our english community can comprehend.
As a comparison to the Chinese online community, all these concepts were already familiarized and widely discussed.
iphonespecialist.co.uk
