Oasis warm light, same setting different tones?

[Tanyun]

i found this picture on the net:

https://i.imgur.com/ZXCskvg.jpg

they both same settings but looks very different. does that mean that the right one will be much yellower at max warmth? (considering it is pretty yellow at 0 warmth?)

now im bummed a bit because mine looks like the left one :/ not sure if the right one is superior though... do you care about such device variations? why its like that?

[Sirtel]

Yes, the light and the tone vary from device to device. I wouldn't say the right one is superior. It all depends on your personal preferences.

Mine looks like the device on the left as well, and I wouldn't want it to be any yellower. It's plenty yellow with the warmth up, for me.

[Tanyun]

Originally Posted by Sirtel

Yes, the light and the tone vary from device to device. I wouldn't say the right one is superior. It all depends on your personal preferences.

Mine looks like the device on the left as well, and I wouldn't want it to be any yellower. It's plenty yellow with the warmth up, for me.

yeah you are right, never thought about it this way, i feel better now lol! thanks

[stumped]

Originally Posted by Sirtel

Yes, the light and the tone vary from device to device. I wouldn't say the right one is superior. .....

It is surely much more likely that variation in photos is due to photography. All the devices have the same array of leds , probably from the same factory, the same firmware, and the same screen materials.

If someone actually owns several and photos them side by side, that would be evidence, but most people only own one, thus photo comparisons are suspect?

Are there any reviews which substantiate this device variation hypothesis

[Sirtel]

Originally Posted by stumped

Are there any reviews which substantiate this device variation hypothesis

Can't remember if it has ever been mentioned in any "official" reviews, but it's pretty obvious from the reviews people have posted here on MR. Not only the Oasis and not only the warm light, but screens overall vary between individual devices.

[stumped]

Originally Posted by Sirtel

Can't remember if it has ever been mentioned in any "official" reviews, but it's pretty obvious from the reviews people have posted here on MR. Not only the Oasis and not only the warm light, but screens overall vary between individual devices.

ok - any theory as to how same hardware can behave like that ?

[Sirtel]

Originally Posted by stumped

ok - any theory as to how same hardware can behave like that ?

Probably tiny variations in the positions of LED lights and other screen parts (but I'm far from being an expert in such matters). As for the current case, perhaps the assembler accidentally substituted a yellow led for a white one?

[DuckieTigger]

Originally Posted by stumped

It is surely much more likely that variation in photos is due to photography. All the devices have the same array of leds , probably from the same factory, the same firmware, and the same screen materials.

If someone actually owns several and photos them side by side, that would be evidence, but most people only own one, thus photo comparisons are suspect?

Are there any reviews which substantiate this device variation hypothesis

Did you even look at the picture in the first post? It is one picture with two devices at once. The background is pretty consistent color wise, the devices are not. Do you suggest that someone went out of their way to photoshop the picture to make both screen different?

To me that picture is proof by itself that there is variations, real variations, not imagined ones.

[j.p.s]

Originally Posted by stumped

ok - any theory as to how same hardware can behave like that ?

LEDs vary from production run to production run. Kindles made the same week are likely nearly identical. Kindles made months apart could well vary.

A few years ago on mobileread, there was widespread agreement that displays had varying color gradients and varying color temperature and shading. The points of contention were whether it mattered or should matter.

[stumped]

[QUOTE=DuckieTigger;3976191]Did you even look at the picture in the first post? It is one picture with two devices at once. /QUOTE]

I did.
and I immediately saw that devices' settings are not the same.
So that particular picture is useless, evidentially.


I am not denying that differences can exist, I am asking if anyone has determined which components cause the variation.

And that photography can be suspect, unless you are a skilled photographer. Even side by side, one could be getting or reflecting more natural light or be more or less influenced by a flash. If camera is aimed at centre of device A, with device B off to one side, and flash is used, then device B gets far less flash light.

The most objective , trustworthy process is this: and we'd have to trust the photographer.
Take a picture of device A, then replace it with device B in exactly the same place without moving the camera and take a 2nd picture, with identical camera settings.
Then put those pictures side by side
Obviously also, screens have to have the same display, and the same number of screen changes since e-ink was last refreshed.

[John F]

[QUOTE=stumped;3976286]

Originally Posted by DuckieTigger

Did you even look at the picture in the first post? It is one picture with two devices at once. /QUOTE]

I did.
and I immediately saw that devices' settings are not the same.
So that particular picture is useless, evidentially.


...
.

The only difference in settings I see is the Auto Brightness? And since the level indicators are the same, doesn't that indicate that the settings are the same.

[stumped]

It indicates to me that auto brightness probably has some effect, even when sliders are at max.
But really, picking at a sample of 1 is pointless.
And very few individuals will own multiple supposedly identical devices. Companies who do reviews are more likely to, which is why I asked about that a few posts back
I very much doubt that some devices have a coloured led where a white should be, as surely the LEDs are auto inserted by some mass production machine, not some individual with 2 boxes full soldering them in one at a time?

I have no axe to grind here, just curious as to how deeply this has been evaluated.

[Sirtel]

Originally Posted by stumped

I have no axe to grind here, just curious as to how deeply this has been evaluated.

It has not been officially evaluated. But MR is full of reports from users who have exchanged an unsatisfying device, often several times in a row, and by those reports individual devices do differ (hence the need to exchange, otherwise there would be no point).

Read any thread about the release of a new Kindle or Kobo model and see for yourself.

[Quoth]

Originally Posted by stumped

I very much doubt that some devices have a coloured led where a white should be, as surely the LEDs are auto inserted by some mass production machine, not some individual with 2 boxes full soldering them in one at a time?.

Indeed this was the reason PCBs were invented in the 1950s. Initially some parts had to be hand inserted. Soldering was by wave.
By the mid 1980s mixed surface mount and through hole with 100% machine placement or insertion was possible.

In the 1960s the surface mount used alumina substrates and a mix of oven soldered paste (screen printed) and hand soldering as it was low volume aerospace. By the mid 1980s companies were switching to all surface mount if possible for higher speed fully automated assembly. There were problems for a while with relays, switches, sockets and electrolytic capacitors.

I would suspect from my experience designing stuff that there are problems with the light pipes (plastic sheets) and also sometimes software. I've seen any number of cheaper LCD monitors, laptop screens and LCD TVs since 2005 with bad LED lighting. The CCFL tubes were expensive, took more space, needed a high voltage and can be fragile. However they are more even and often a better white. Cheap LCD products use a few LEDs along the edges. Expensive ones use arrays behind the panel. The eink uses the cheap LCD edge LEDs method, as obviously a rear lighting array can't work, but with the light pipe panel on top of the display. Mechanical alignment is critical as anyone trying to reassemble an original H2O bezel for IR touch. Hence the light pipe layer is bonded to the screen with the capacitive sense layers and overlaps the LEDs on the main PCB.

[DuckieTigger]

Originally Posted by stumped

And that photography can be suspect, unless you are a skilled photographer. Even side by side, one could be getting or reflecting more natural light or be more or less influenced by a flash. If camera is aimed at centre of device A, with device B off to one side, and flash is used, then device B gets far less flash light.

I see your tinfoil hat is wearing thin. Sure, different natural light and effects from flash, when the brightest light source in the picture comes from the screens itself. Different viewing angle changes perceived color on front lit eink? On unlit eink? Try it with your own device. Different colored lights shining onto the two devices differently, and it magically coincides perfectly with the screen boundaries? No, don't think so. I even tested your theory of auto brightness changing color temperature. Checked if rotating device changes color (one Oasis is left handed, the other right handed). No such luck.

Occam's razor only leaves one answer as the most likely: the picture is legit, the devices have a different white balance without the warm leds turned on.