Display contrast dynamically changing - Samsung Epic 4G Touch

Just got my hands on the Epic Touch 4g about two hours ago, and in playing with it I notice the apparent brightness/contrast of the screen changes slightly based on the content currently being displayed.
This is most apparent when scrolling through the home screens-- on the default screen the bottom icons are nice and bright-- but when panning over to the empty calendar (which I'm guessing is supposed to be white, i'm guessing, but looks more grey than anything) the icons at the bottom are dimmer and less contrast-y (yes, I know that's not really a word).
I noticed in the Display settings you can adjust the "Screen Mode"-- but it exhibited this behavior no matter when setting I chose (Dynamic, Standard, and Movie).
The effect almost reminds me of lower end flat Plasma TVs with cheap circuitry that can't handle certain currents when an all-white (or mostly white) screen is being displayed-- it limits the current, so the end result is a light grey screen instead of a bright white display.
Is this considered one of the features of the phone (perhaps to save batter life or screen life)? Anyone else notice similar behavior? Don't want to freak out if this is normal, but at the same time it's a little disconcerting to see something whose major claim to fame is it's "brilliant display" exhibit such behavior.

Go back to the display options, scroll down to "auto adjust screen power" and turn that off and see if that helps...

That was exactly it... thanks.
Nice to know this is a software feature and not something glitchy with the hardware.

Related

screen dims/brightens when I scroll

I notice this in opera, and today in the facebook app too, and was really baffled. The effect is quite subtle, but repeatable. When moving my finger around the screen, eg on the bbc news website panning to the top left, my screen dims. It stays dim when I remove my finger, and brightens again when I pan back down to the right.
Weird, huh?
So far it's just a curiosity and not an annoyance. Has anyone else seen this?
So I am not the only one who noticed this. I sometimes find this behaviour a bit annoying, especially in low light.
The phone has an ambient light sensor. It is adjusting because you are causing a shadow over it.
You can probably turn it off
Under the power settings/backlight - auto adjust backlight. Just uncheck it.
Any idea where the sensor is located?
Do you really think it is the ambient/light sensor? I sure don't. Scrolling through different websites I can easily reproduce this:
You scroll from one point to another, this just has to be a couple of pixels, and the screen adjusts the brightness. That is within a room with a fixed source of light and I am keeping my body as constant as possible to avoid the shadowing.
Scrolling from point A to point B makes the backlight adjust itself, even without casting any shadows or similar. Scrolling back from B to A makes the backlight instantly adjust itself back.
It's your finger causing the shadow, not your body. If you introduce an object into an ambient light source, you will find that said object will reduce the ambient light by a percentage due to partial or total obstruction. The light sensor is detecting this percentage and adjusting the screen accordingly.
The sensor itself is somewhere near the speaker.
I'm pretty sure this doen't have anything to do with the light sensor UNLESS it's cause by the screen itself becoming brighter and this registering on the light sensor, eg internal light leak.
My best guess is that it's connected to the presence/absence of certain colours on the screen, and is related to the video driver. Next time I get it I'll see if I can reproduce when scrolling via the kbd, to eliminate the theories about casting shadows on the screen.
This is not FINGER SHADOW!!!
You can notice this same thing when you plaing Solitare cards and using Stylus.
I'm sure i did't do any shadows and anyway when i pick up any card and moving aroud screen u can notice screen brighting up and down.
Using Opera 9.5, on this site http://game-board.blogspot.com/2008/05/alternative-monopoly-rules-and-game.html zoom in with double-click, scroll about half way down to the paragraph beginning "property has too much pollution on it", then scroll up and down and notice the change in screen brightness. please post if you can repeat. it does not work with the keyboard.
btw, does anyone know monopoly "bloodbath" alternative rules?
I've noticed my screen doing this without causing any shadows & without even touching the screen at all, like a 'breathing effect' when it is completely idle. I think it has something to do with light sensor polling interval which is editable via the registry, advance config and HD tweak...but since I flashed NRGZ ROM (21/08/09 build) this issue has gone anyway.

[Q] Automatically Adjust brightness option?

Hello all,
I'm just curious as to how this feature is supposed to work. I have my device set to automatically adjust while it's on medium brightness and I've noticed that the brightness jumps from low to medium frequently, especially when I'm on just one page.
manny84 said:
Hello all,
I'm just curious as to how this feature is supposed to work. I have my device set to automatically adjust while it's on medium brightness and I've noticed that the brightness jumps from low to medium frequently, especially when I'm on just one page.
Click to expand...
Click to collapse
I believe it just counts the number of white pixels on the screen on the omnia. this is why it jumps so much. The only way to prevent the jumping is to set the birghtness on low, with the auto setting off. Even on medium or high it jumps when the page has a certain % of white pixels. Like for opening the browser its really annoying however on low brightness the colours are really nice and its just perfect for me. Its just too bright on med or high brightness for my preferences.
But the way how the "feature" itself work I have no clue. Maybe a light sensor. But the jumpiness is caused by the number of white pixels on the amoled screens, and occurs only on samsung devices I believe.
Marvin_S said:
I believe it just counts the number of white pixels on the screen on the omnia. this is why it jumps so much. The only way to prevent the jumping is to set the birghtness on low, with the auto setting off. Even on medium or high it jumps when the page has a certain % of white pixels. Like for opening the browser its really annoying however on low brightness the colours are really nice and its just perfect for me. Its just too bright on med or high brightness for my preferences.
But the way how the "feature" itself work I have no clue. Maybe a light sensor. But the jumpiness is caused by the number of white pixels on the amoled screens, and occurs only on samsung devices I believe.
Click to expand...
Click to collapse
Thanks for that explanation, Marvin

Adaptive brightness too dramatic?

I've seen a couple posts about delays with adaptive brightness, but this is a different item. I'm seeing that the adaptive brightness alters the brightness a little too dramatically. In a somewhat dark room (not pitch black) the brightness will be at absolute minimum even when the brightness is about 1/3 up on the slider. In a moderately bright room that same brightness setting will be near maximum.
Does anyone else notice this as an issue? I'm just wondering if it's normal (ie, software calibration issue) or if the brightness sensor might not be seated correctly.
It's normal. Or at least it sounds like it is working the same way mine is. And yes, IMO it is a little too sensitive. The Lux app works beautifully if you want an alternative. Also, the goog is known for tweaking this feature over time with updates.
I've noticed this too. The biggest thing for me is walking down the street at dusk (so not dark out yet) I can't read the screen as it turns it all the way down, then, when I walk under a street light, it turns it all the way up to full! It's one extreme or the other, there seems to be no middle ground.
In other words "adaptive brightness has mind of its own!"
This is why I have always kept this setting off. The brightness just changing on its own always annoyed me.
When it works properly (and it should) for ones uses, it's great, it's automatic, what's not to like? It's a pita to always have to change brightness manually just to see a phone display depending on ambient lighting which varies immensely for many users.
jbdan said:
When it works properly (and it should) for ones uses, it's great, it's automatic, what's not to like? It's a pita to always have to change brightness manually just to see a phone display depending on ambient lighting which varies immensely for many users.
Click to expand...
Click to collapse
I agree. I have it set to maybe around 15-20% (centered over the WiFi symbol below it) and I never need to touch it. Gets dark enough for night driving and bright enough to read outside. Never found it stuck on one or the other when it shouldn't be.
Sent from my Nexus 5X using Tapatalk
If you buy the app Lux you can customize how it adapts your brightness. The free version is good to but you have to use mostly default settings. By default it only adapts brightness when the screen turns on.

Do you have some tips to avoid screen burn on amoled?

Hi, I'm a new amoled user. I've bought a op7t and I'm pretty happy with it.
But I read everywhere about screen burn problems.
I know this is a tech issue with amoled. And this is my first amoled display.
So do you have some tips for me to avoid screen burn? Someone talk about notifications area? Using maps (absurd), time-lapse and fingerprint is that all true?
Thank you in advance
I'll make an effort of sharing my experience with AMOLED screens and what caused the burn in
Persistent screen elements like the status bar icons and navbar at the bottom left permanent ghosting on the screen. The causes I think were the increased screen timeout (30 minutes) and using GPS with the screen on as well as having a navbar that wasn't translucent or changing colors.
Mind you this happened over a period of 3 years and I didn't notice anything unless I really looked for it. I watched videos and the ghosting didn't affect anything. Only on bright backgrounds such as a white screen or gray did it pop up. Not enough to be noticeable or hinder my viewing experience and I am very particular about that.
Tips I've since been using after getting that experience for my new phone (7T 1907)
1) Keeping screen brightness under 50 percent unless absolutely required
2) Quickly switching between various different apps for a couple of seconds when using my phone for a long time
3) Keeping the screen off while using GPS and occasionally turn it on for looking at directions
4) You can turn off status bar icons from inside the settings to prevent them from causing the burn in under the status bar settings
5) Not increasing the screen timeout to anything over 2 minutes
This is what I know and have researched about OLED screens in general. If you have anymore questions I'll be willing to help.
It has been over five months since I got it and replaced my old phone. So far so good

Question Screen issue or software bug?

Hi!
I have received my Red Magic 8 Pro and immediately noticed something. The selfie camera is visible if the background behind it is simple. For example just a simple white or gray background. Depending on movie sometimes it also becomes visible under cartoons like Rick and Morty, however during normal movie I cant see it.
Is this normal for this phone?
Also, the software which handles the pixels in front of the camera sometimes can become bugged and a visible line is displayed. I can reproduce this issue by pulling down the notification bar and holding it at 1 spot.
Does everyone experience these issues ?
That's normal, especially if the screen is on 120Hz, and at low brightness. It's the so-called green tint issue.

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