Database Develop

Non-uniform intensity across screen at low-brightness settings?

Hi,
Has anyone notciced un-even brightness across the screen at low light levels (for darker colors)? I thought it was just the nature of these OLED screens, but I don't see this with Galaxy Phone with similar display type, so I'm wondering if I just have a defective unit with bad display.
To test it:
- Do this at night (when ambient light is fairly low).
- Lower brightness down to the lowest setting (turn off auto-brightness)
- Open Chrome browser, and close all tabs, so that you get a blank dark screen with just the "+" icon. This leaves a dark gray background, just enough to notice if there is any uneveness in brightness.
On my unit, I see about 3-4 inches of bands/streaks of darker areas at bottom half of the screen. If I rotate the tablet, the darker areas stay in their physical location (so these bands become vertical instead of horizontal), so I know it's not a software issue.
I have a couple of weeks left before I need to decide on whether to exchange the tab, so would appreciate if anyone can help me verify if this is normal thing with these screens.
Many thanks, Tony.

tonyc1 said:
Hi,
Has anyone notciced un-even brightness across the screen at low light levels (for darker colors)? I thought it was just the nature of these OLED screens, but I don't see this with Galaxy Phone with similar display type, so I'm wondering if I just have a defective unit with bad display.
To test it:
- Do this at night (when ambient light is fairly low).
- Lower brightness down to the lowest setting (turn off auto-brightness)
- Open Chrome browser, and close all tabs, so that you get a blank dark screen with just the "+" icon. This leaves a dark gray background, just enough to notice if there is any uneveness in brightness.
On my unit, I see about 3-4 inches of bands/streaks of darker areas at bottom half of the screen. If I rotate the tablet, the darker areas stay in their physical location (so these bands become vertical instead of horizontal), so I know it's not a software issue.
I have a couple of weeks left before I need to decide on whether to exchange the tab, so would appreciate if anyone can help me verify if this is normal thing with these screens.
Many thanks, Tony.
Click to expand...
Click to collapse
I have notice a similar thing, mostly on gray - dark gray backgrounds, and not necessarily at lowest brightness (low enough though). I wanted to check about it on a couple of devices on display at retail stores but it's hard to test there.
Sent from my SM-T815 using Tapatalk

Hi tonyc1,
Having had 4 of these I can confirm that this unevenness is normal on the 9.7" screen but was not present on the 8" model.
I went through 4 to get one that was reasonably even, 2 of them were pretty awful to the point that the greyscale was all over the place.
The unit I settled on has a slightly darker band in the middle of the screen and a slight darkening at the very top.
I owned the original tab s 10.5 and have to say the screen on that was more even and detailed, I prefer the former factor and speed of this S2 but the screen is a step backwards.
Hope this info helps.
Cheers

Thanks for the notes and confirming this is a somewhat common issue. I guess I will live with it for now..

Black screen doesn't turn off pixels

Hi everyone, as you should know the Asus Zenwatch 3 has an AMOLED display. From my understanding this should mean when displaying the colour black, the pixels should be turned off completely (like on my S7 Edge).
I was looking at my watch in a pitch black room with an ambient watch face displaying a black background and it appeared slightly reddish. Compared with my LG G Watch R sporting the exact same watch face it was clear the LG had the black pixels turned off but not on my Zenwatch 3.
I've attached a couple of pictures taken with my phone of the Zenwatch 3 in a pitch black room, one with normal shutter speed and the other with a 2 second shutter speed. Evidently the 2 second shutter speed shows that the display is in fact not turning off the pixels. The pics were taken when the watch was charging and in ambient mode with a watch face set to true black only.
Can anyone else confirm that this is the case and maybe a reason why? I'm worried that battery life may be affected by this with always on display enabled.
Lastly on a side note, are the black lines that aren't illuminated something to worry about?

Mine is the same, including a similar set of dark lines. I've seen others on Reddit report identical concerns.

frelnik said:
Mine is the same, including a similar set of dark lines. I've seen others on Reddit report identical concerns.
Click to expand...
Click to collapse
Noticed this too, thought I was crazy lol...kinda waste of an AMOLED screen.

Hmmm ok at least I'm not the only one. Hopefully Asus is able to change it in a future update.

Yeah it is weird, black watch faces aren't truly black. I think they did it so watch faces can blend into the color scheme of the watch, if you notice the color overlay on the app launcher

That's because of auto Brightness. Turn it off. This impacts battery life. I observed this on very first day after the purchase. Using manual Brightness since then.

deathgame said:
That's because of auto Brightness. Turn it off. This impacts battery life. I observed this on very first day after the purchase. Using manual Brightness since then.
Click to expand...
Click to collapse
I just tried disabling Auto Brightness but the red tinge of the black background still exists.

blackhand64 said:
I just tried disabling Auto Brightness but the red tinge of the black background still exists.
Click to expand...
Click to collapse
It doesn't happen with me. If I turn off auto Brightness the blacks go complete black. Do you have live display turned on your phones? If so try disabling it. May be this setting depends on your phone. All I can confirm is if I turned auto Brightness off amoled works perfectly.

deathgame said:
It doesn't happen with me. If I turn off auto Brightness the blacks go complete black. Do you have live display turned on your phones? If so try disabling it. May be this setting depends on your phone. All I can confirm is if I turned auto Brightness off amoled works perfectly.
Click to expand...
Click to collapse
Not sure what you mean by live display but I just have a stock S7 Edge. I prefer keeping the auto brightness on for my watch so I guess I'll have to live with it.

blackhand64 said:
Not sure what you mean by live display but I just have a stock S7 Edge. I prefer keeping the auto brightness on for my watch so I guess I'll have to live with it.
Click to expand...
Click to collapse
Live display is when some ROMs allow the screen to have a tint at night time so the blue light from the screen won't affect your eyes at night

Me too have similar display and black line like that.
Glad I'm not the only one with this condition.

I also have those black lines, was about to get a replacement but since I'm not the only one and it doesn't affect overall performance or aesthetics its fine.

Yeah I have also black lines and screen is not completely dark with totally black watch faces

Turning off the auto brightness is not a solution. Its a pain if you had to adjust the brightness all the time

Display - Light bleed

Hi
I just received my Redmi 4x. While I tried different wallpapers I noticed a slight green tint on the lower border of the display.
Further inspection showed a visible green coloration on the lower portion of the display. The brighter the display gets, the more visisble it becomes. I don't care about the slight light-bleed on the top or bottom left.
You can find some photos I took.
Code:
https://ibb.co/ku6hgb
https://ibb.co/fpuXEw
https://ibb.co/kuTsEw
https://ibb.co/nAezuw
Of course I don't watch black images at maximum brightness all day. This scenario was chosen for the purpose of illustrating the problem.
I wonder if the display of my Redmi 4x is an exception or the standard.
Thanks for your participation.

I have this problem also. I am using my 4x for 5 months already, and I always use adaptive brightness, but still I got back light bleeding

Contrast settings and manual brightness issues

The first issue regarding contrast settings is that on 10.2.28 at least, if I set the phone to "standard contrast", sometimes upon waking it, it forgets that setting and looks exactly as if set on "automatic contrast", even though standard is still checked. Just confirmed this as my screen looked rather blue, changed to "automatic" and it remained identical, then I changed it back to standard and it finally got the desired white balance.The point of "standard contrast" is that it should be CONSTANT, not ever changing... I've got the phone 4 days ago (enjoying it overall) and I've got to ask if this has been an ongoing issue or is it new in 10.2.28?
The second issue is that with auto brightness OFF, the phone still bumps to max manual brightness when the sun shines directly on the sensor. It's not as annoying as the first issue but I'd rather it would not do that. This is how the mi 9 behaved since release or just a new bug?
Ultimately, can you guys point me to the most effective way of reporting bugs to xiaomi?

I'm on the same rom version... I don't have any issues with contrast changing like you said but I'm on increased contrast at all times... There's no way of disabling the screen boosting brightness in sun light regardless of auto brightness settings... It's sunlight 2.0 mode and actually boosts the brightness higher then the max on the brightness slider.

Question Activate low brightness DC dimming in custom ROMs?

Hi,
like other OLED phones, the ASUS Zenfone 8 suffers from PWM flickering in lower brightness. If you ever wondered why your phone seems flickery, unsettled or straining to the eyes in low brightness, this comes exactly from PWM flicker in the OLED display. (It's high frequency flicker so you won't notice immediately, but might be able to cause fatigue or eye strain, it is different from person to person) Dxomark had an article about this issue.
The ASUS Zenfone 8 has an option to enable DC dimming to mitigate PWM flickering in low brightness, according to reviewers and the display manufacturer. Stupidly, however, it is an option, not enabled by default. (Also only available in 60 Hz, but that's a minor restriction IMHO) In can be found under settings in stock ROM. But in my custom ROM (LineageOS), this option is not available anymore.
I am wondering if anyone found out a way to enable the DC dimming option in custom ROMs as well, maybe programmatically via. a control file, from command line, adb or whatever. Would be great to get this feature to non-stock-ROM usages as well.

I found out something, at least a workaround.
Dimming is actually quite straightforward in OLED displays, since there is no backlight. A grey value of 20% RGB in full brightness is the same as a white value (100% RGB) in 20% brightness. Literally. They are the same. In regular LCD displays, this would not be the same; there would be a huge difference in contrast between full backlight and reduced backlight.
Now, since PWM flicker only occurs in lower brightness settings, we can "trick" the display, set it to max. brightness and instead dim the display by just reducing all the RGB values by the percentage the display should be dimmed. The result will look exactly the same just without PWM. At least I haven't found any differences, also the colors are still very accurate despeite OLED displays are said to have lower color accuracy when dimmed via. DC dimming.
There exists some apps to replace the "hardware dimming" with "software dimming":
* [APP]OLED Saver (flicker free backlight dimming, no PWM)
* [APP] AMOLED PWMfree
I tried the first one (OLED Saver) and I am quite satisfied. I even found the custom brightness adaption way better than stock Android, since it reacts faster. And the difference between PWM and no PWM is really noticeable. Reading text in low light is much more pleasing now, much easier to the eyes, I can recommend you to try it out.
A drawback is that both of these apps reduce brightness via. a full screen overlay. Since most of us here have rooted phones, a much better solution would be to dim the display by modifying the system color settings. Similar to apps like CF.lumen which use this to implement night sight. Unfortunately, I haven't found an app doing this for brightness regulation. If there exists one, please let me know, it would be the ideal solution!
If custom ROM developers are reading this, would be a great feature to add to any ROM It is very straightforward to implement: Just decouple brightness regulation from the display driver; and reuse the brightness signal to alter the system color settings. I am sure that the ASUS DC dimming option does something like this as well.