yashsingh1/xdaforums huggingface dataset:
[One (M8) General] Maedhros:
Ah, ok thank you.

If I'm not mistaken, the Sharp panel on the M7 had the better contrast of the two? But were slightly warmer and more yellowish? It also had the best black values.

If I'm wrong, someone please step in and correct me.

You've already stated that the contrast of the M8 is better, how about the blacks?

EDIT:

If people could report their findings for the following tests:

http://www.lagom.nl/lcd-test/black.php

http://www.lagom.nl/lcd-test/white.php

My own results are:

I can begin to notice blacks @ box 4.

I can see notice all the checkerboard panels.

EDIT2:

For reference, my Iphone 5S can see the black box at 3
[One (M8) General] robt772000:
Both are Sharp panels.

Photos will be uploaded soon.
[One (M8) General] replica9000:
I just compared the two phones side by side with Display Tester.

Looks like the M7 has a noticeably brighter display than the M8. Compared to the M7, white looks a little grey. Black is better on the M8, probably since the display is darker. The M7 also has those faint vertical lines in landscape. Only other camera I have is my Rezound, but it doesn't really show the differences.
[One (M8) General] Maedhros:
Thank you -

It looks like there is quite a bit of variance between Sharp units. Perhaps there are multiple sharp panels?

[MENTION=853050]puremind[/MENTION], any thoughts? Could these discrepancies be explained by factory calibration?
[One (M8) General] puremind:
Same for me. I have seen 5 phones in 5 different shops now and all very similar to mine. I tested my own phone again after 1 week of use and the reason why you cannot see boxes 1, 2 and 3 is because gamma is at 2.3 instead of 2.2 at near black levels. But from 40% brightness onwards the display overbrightens tones, which causes mid-tones to be too light and pastelly so there is less punchiness in the picture.

Also the greyscale contains too much green and blue (also bpicking up above 40% brightness) so the display has a slight turquese hue. Overall the screen is lacking reds - blue and green were pushed in an attempt to increase white brightness at the expense of hue and gamma. Red cannot follow. Targetting a more accurate white color temperature would mean decreasing brightness and contrast a little bit but it would have more solid colors.

I am back in Frankfurt and will reexamine that better screen I saw at the shops.
[One (M8) General] puremind:
So far it seems only Sharp panels from everyone.

Last year JDI had wild variety of display brightness and color temperature but very similar contrast and color saturations. The contraint was the contrast and based upon the targeted contrast of 1000:1 color temperature was adjusted to reach the brightness targted (or seen in the opposite way, color temperature was improved as close to 6500K as possible without getting below 1000:1 contrast.

This year the display characteristics are different and it looks like the display had to be molested more to produce the 1000.1 contrast, which impacted chromaticity.

If some displays are better than others, then what I expect to see is a 1000:1 ANSI contrast but with improved, more accurate greyscale and less green in the picture (which makes oranges look too yellowy).

So it is possible that we will see a more naturally calibrated display if the Sharp displays have that kind of variability. We already have someone with two Sharp displays that have different calibration, but calibration does not come from nowhere, it is usually to achieved the desired contrast or color temperate - in HTC's case it has always been to achieve the desired contast - brightness and color temperature have been the dependent variables.

I have also seen one better display in the shops so I will be visiting again tomorrow.
[One (M8) General] robt772000:
Here are the two sharp displays:

https://drive.google.com/folderview?id=0B5ty5HwG0mjCcV9KX0NBbVFLUEU&usp=sharing
[One (M8) General] SolarTrans:
A

So the one on the left is the better one?
[One (M8) General] robt772000:
You be the judge. As someone who works with colour I see the difference. One on the left is cooler.
[One (M8) General] SolarTrans:
Yeah that was the first thing I noticed. I personally much prefer cooler displays to warmer ones, so I'd hands down pick the left one.

I feel like the one on the right is a little too warm.
[One (M8) General] robt772000:
I just used trickster mod screen calibration and turned down the red pixels. It's nice and cool now. I believe they are the same panels calibrated differently.
[One (M8) General] SolarTrans:
That's very possible. Good thought.
[One (M8) General] robt772000:
They completely match now after trickster mod re-calibrated.
[One (M8) General] andrewnelson:
Guys how do you find the colours on the m8?
[One (M8) General] puremind:
It is not the red that is too high, it is more more the green that makes everything warm. Can you link that mod? Most recalibration is usually at the the expense of contrast, unless they work with root access.
[One (M8) General] mscott:
My luck of the draw is that I have a screen that is not easily readable by polarized sunglasses.

Probably will return it. Not sure if I'll get another m8, or try the s5. Debated it for quite some time before deciding on the m8, since I've had HTC phones for quite some time.
[One (M8) General] StickyGeko:
Mines same as the cooler looking screen.... Replacement arrives Wednesday....hopefully be the Same
[One (M8) General] Maedhros:
Could you check which display your M8 has before returning it?

Someone else reported not being able to see the display with polarized glasses. I can see my display with polarized glasses on.

Can you describe what you mean by not being able to see the screen with polarized glasses? Nothing at all...? Or...
[One (M8) General] mscott:
Unfortunately, during the return period, I usually do not root the phone for warranty reasons, and as far as I can tell, that is the only method to check.

If I am looking at the phone in portrait mode, it is very dim. If I rotate it 45 degrees either way, it is much more visible. When I hit landscape mode it is bright but not fully bright.

You could mistake the phone for being off while looking at it in portrait. My wife's nook did this as well
[One (M8) General] puremind:
Yes it is calibration. More neutral panels will be calibrated to a warmer color temperature while cooler panels will be calibrated to a cooler standard to protect the 1000:1 ANSI contrast.

I was finally able to go to the shops. Color temperature on the other unit is cooler but gamma is still now. And blue is inaccurate on that display. Looks like it is still a sharp. Hopefully we will see some JDI soon.

I will post charts.
[One (M8) General] puremind:
Try to open the Windows when you change to portrait and light a candle to see if it changes anything.
[One (M8) General] DigitalMadness:
With glasses i can read and see screen in both landscape and normal mode.. Sure there are some funky colors when i angle the phone but its readable. What does this really mean? :S
[One (M8) General] puremind:
Here is my comparison of both display types:

Key Measures

Maximum Brightness: 500cd/m²

Contrast 1040 vs. 980

Gamma: 2.13 vs. 2.06

RGB Greyscale Balance (Delta E 5.68 vs. 7.75)

Color temperature (7395 vs. 7420)

Gamma (2.13 vs. 2.06)

Color Space (3.90 vs. 4.35)
[One (M8) General] Maedhros:
This means that the M8's screen is polarized.

Any time you look @ two things that are both polarized, this effect will occur.

What I'm unsure of is why some people's displays are completely unreadable. To quote [MENTION=790878]mscott[/MENTION],

Despite the screen being polarized, it should still be visible.

If you want to see what is "normal" check this:

http://forums.macrumors.com/showthread.php?t=1449905

I'm curious to know if the screens that are unviewable are JDI units, or just sharp units.

EDIT: After a bit of reading, it appears that the polarized coating variance can be quite large. A screen that isn't viewable through polarized glasses may be quite normal.

Thank you for taking all of these measurements. I honestly have no background in graphics, calibration, or screens, so forgive me if I'm mistaken, but it seems like the majority of the variance we see in this thread can be largely attributed to factory calibration? There doesn't appear to be any significant variance between different Sharp panels.

I guess we won't know more till someone with a JDI panel pops up. Even then, without a detailed analysis such as the one you conducted, I don't know how much meaningful data we can collect.
[One (M8) General] puremind:
Calibration reflects the individual limitations of each display. So while while the differences are calibration related they account for how neutral the native color temperature of each panel is.

Compared to last year all primaries and secondaries except blue are oversaturated and magenta is way off as a result of saturating red.

None of these screens will be as good as the S5. Wait for Z2. The first display test for the Z2 will appear in a couple of days.
[One (M8) General] robt772000:
Hey guys I run elementalx kernel and you can just get trickster mod from play store.

I tried leaving reds at full and reducing green but didn't get a nice calibration. Red at 235, green at 245, and blue at 255.

check this out too: HTC ONE M8 - Made in Taiwan vs Made in China - Sc…: https://youtu.be/0osrpESuFkQ
[One (M8) General] puremind:
I have the version made in china, which has more green. Which do you have? I will use trickster and calibrate , I am curious if I can chaneg calibration without losing contrast...
[One (M8) General] manup456:
I been reading through this thread and can't see any issue with my display color wise.
[One (M8) General] SolarTrans:
Screenshots won't help as they're only the picture being displayed on the screen and not how the screen is displaying it.
[One (M8) General] robt772000:
2.5ghz made in China.

Contrast is better after re-calibrating.
[One (M8) General] puremind:
I used trickster to calibrate to a neutral tone. My Settings are:

Red: 255

Green: 237

Blue: 229

This setting will essentially fix all color issues for my screen (Made in China) however it will also reveal the true contrast of the screen once bereft of any color balance tricks. In my case it end up at 820:1 instead of 1000:1.

So really what HTC have been doing is sacrifice color accuracy to artificially increase contrast, as we can easily see that magenta was taking a big hit previously since blue was pushed up. Now with blue reigned in the magenta color falls nicely into place.

Here is the calibrated vs pre-calibration:

Key Measures

Maximum Brightness: 417 cd/m² vs.500cd/m²

Contrast 820 vs. 1040

RGB Greyscale Balance (Delta E 1.49 vs. 5.68)

Color Space (Delta E: 2.25 vs. 3.90)
[One (M8) General] robt772000:
Brightness took a hit? Did you calibrate using trickster mod similar to my settings?

I'm getting annoyed. Seriously look at Z2 now.
[One (M8) General] mscott:
Yes, it is polarized. A few years back, I bought prescription sunglasses. Found that incould see differently outbof one eye versus the other. Turns out yet did something wrong to where the polarization angle was not what is recommended. I could see screens with one eye but not the other.

I looked at another m8 at the store that didn't exhibit the same behavior, but I still ended up trying the gs5.

Clearly there are differences in the displays. I'd recommend when buying the phone check it out with your polarized glasses on before leaving the store.
[One (M8) General] Maedhros:
These settings make my display look more bluer than stock. I think I like them. Thank you for sharing.

Mind if I ask what you compared them to when making the changes?

BTW, my unit was made in Taiwan.

Using your settings my display looks far too redish imo.

I'll compare both of these settings to my Iphone 5s later.
[One (M8) General] robt772000:
I compared my device with another M8 and a good M7. I went through a few M7s last year. My 64gb was the best I had. I was on this thread over at M7 with similar comparisons.
[One (M8) General] puremind:
Yes, there is always a trade off between color accuracy / neutral color temerature and maximum brightness / contrast.

I used trickster and indicated my Settings. I also applied your settings and contrast was reduced to 800. This is normal...if you remove a Color you are going to lose brightness.

What trickter doesn't have is contols for RGB Offset and gains which would allow a bit more control. Essentially, Android unlike Windows does not allow LUT calibration or graphic card manual calibration. This is where some additional software such as developed by [MENTION=2617206]supercurio[/MENTION] can come in handy.

The display on the Nexus 5 is just superior off the bat and it looks like the Z2 might also be superior.

Having said that most users will be happy with the display on the M8. It is just not up there at the top with the best LCD Displays.

Last year's display was actually a bit btter because it had more accurate primary and secondary colors as well as more adequate gamma.
[One (M8) General] puremind:
Well my display is the one made in China. So it has a high deficiency in red and too much green, so I had to remove quite a bit of green and blue. Yours is made in Taiwan and seems more similar to the other diplay I measured in store, so your green is pretty much OK and you have too little red and too much blue.
[One (M8) General] ryanjsoo:
So Chinese display is inferior?, I have the 2.5ghz AU model, screen seems super bright.
[One (M8) General] puremind:
The China display is overall more accurate but is warmer which may be more objectionable to some users. It is a matter of preference. Watch the YouTube video linked above and decide for yourself..
[One (M8) General] andrewnelson:
The reds are not over saturated. What you mean is the grey balance is too warm. Saturation and grey scale Balance are two different things.
[One (M8) General] robt772000:
I wonder if my display will change over time?
[One (M8) General] puremind:
In this case the reds really are oversaturated. Color temperature is on the cool side but for one of the displays it has too much green.
[One (M8) General] puremind:
Last year the JDI display changed over time. RGB balance became cooler over time, so something similar could happen on the Sharp display. It was over the course of just a month.
[One (M8) General] robt772000:
I had a feeling it may be the case. Red pixels usually fade over time. My display on day one was way warmer than now even before calibration. It was so bad on day one I took it back.
[One (M8) General] jorgemoya:
I'm replacing my defective lift speaker grill unit that also has a yellow tinted screen. Man, I feel I won't get lucky with my next unit and feel like asking for a full refund and getting something else. Why HTC? Why?
[One (M8) General] replica9000:
I'm getting my M8 swapped out too. I'll compare the screens before I send my old on back.
[One (M8) General] Jooosty:
I went for a phone exchange due to a defect.

Low and behold I got to witness both types of screens in front of me.

The new unit had a very warm white. My old device was much more cool.

I have zero knowledge on screen terminology so that's the best I could describe it.

I opted to keep my defective phone with the cooler screen than change to the new warm screen. I just couldn't like it....

HTC UltimEight ?
[One (M8) General] puremind:
First review of the Z2's display compared to M8 and S5!

HTC One Display> Z2

http://translate.googleusercontent....9.html&usg=ALkJrhgOVLIRTgEIc5BWVMFy3kMJtKSvsA

Touch response is only 100ms (glove mode only).

Confirmed touch response of the S5 is the same as the S4 (91ms with increased sensitivity on).
[One (M8) General] jorgemoya:
I wonder if touch response varies by display. :S
[One (M8) General] robt772000:
I doubt it. The digitizer is a separate panel and I think from one company.

The LCD under is different.
[One (M8) General] SolarTrans:
So that puts the S5 at 114ms... That's very disappointing. 2.5x of the M8 and 1.5x of the iPhone 5s is not what I expected from a new Samsung Flagship. That's even worse than the Note 3!
[One (M8) General] killerapl:
In order to change screen settings in trickster you need to have different kernal than stock correct?
[One (M8) General] Tikerz:
You can also use Fauxclock, if you purchased it, to change color. I like it better than Trickster because the slider changes the screen in real-time.

---------- Post added at 04:57 PM ---------- Previous post was at 04:42 PM ----------

I haven't seen any other panels except for "m8_sharp_novatek_panel_on".

Does anyone have anything different?
[One (M8) General] Maedhros:
Nope... no definitive proof of HTC putting out two panels from different manufactures as of yet.
[One (M8) General] robt772000:
I had a jdi M7
[One (M8) General] californiarailroader:
I'm weird I guess, I actually like my display :) Mine is made in Taiwan by the way, which today means better quality than the Chinese stuff, years ago when you saw Made in Taiwan, you thought "uggh, more junk" lol

---------- Post added at 05:13 AM ---------- Previous post was at 05:04 AM ----------

You and I seem to be a rare breed in this thread ;) :D
[One (M8) General] puremind:
What is the serial number? Today I saw an HTxxxxxxx in in the shops and it had both better contrast and more neutral color temperature...
[One (M8) General] puremind:
First review of the Z2's display compared to M8 and S5!

I think they used a color meter instead of spectroradiometer because their color temperature / Grey balance measurements seem to be off. For me the S5 is more accurate than the M8 in terms of grey balance and chromaticity.

The Z2 screen is behind both S5 and M8 though. I I saw it today and as per the article contrast is only 1000:1 like on the M8 but it reflects more and also is less bright so poorly legible ins the sun.

This year my ranking:

1. S5/N5

2. Asus Padfone Infinity A86

3. M8

4. LG G2

5. Z2

http://translate.googleusercontent....9.html&usg=ALkJrhgOVLIRTgEIc5BWVMFy3kMJtKSvsA

Regarding touch response, this is the updated ranking for 2014:

HTC One M8: 46ms

Note 3: 67ms

Asus Padfone: 73ms

iPhone 5S: 75ms (same as iPhone 5)

Nexus 5 : 75ms

Galaxy S5: 91ms (165ms with activated air view and deactivated "increased sensibility")

Sony Z2: 100ms (glove mode)

LG G2: 110ms
[One (M8) General] Maedhros:
I have a Taiwan unit as well. I really like the screen. IMO, better than the M7 and S4.
[One (M8) General] Lostatsea23:
Yeah the S5 is slightly more accurate in some ways but the gamma is too high at 2.44 or so...

I had the S5 and switched to the M8 and I can clearly see I have the better display with higher contrast ratio.

The screen is more pleasing to me as pentile isnt that sharp and has a grain to it that I can't stand.
[One (M8) General] robt772000:
After one week my warm yellowish screen has cooled off a bit. It looks similar to the N5 now. I'm surprised that's it's changed. Really happy with it now. Don't need to adjust the calibration anymore.
[One (M8) General] californiarailroader:
ht43xwm07xxx
[One (M8) General] puremind:
OK looks like the HT stuff has cooler calibration. I will test the phone from the shop tomorow.

I can already tell you that the display on my HTC one has moved from 7300K to 7700 K since I have been using it. Getting cooler, same as last year.
[One (M8) General] puremind:
Yes, happened for me too after only 2 weeks. It is getting closer and closer to the other variant of the screen.
[One (M8) General] robt772000:
Is yours cooling off too? When I see my dad I will compare again.
[One (M8) General] bitwiser:
Mine is m8 1080p sharp/NT35595

Seems ok, more on the cool side and of course not nearly as bright/vivid as the S5. But mine was similar to the M8 in the store I went to.
[One (M8) General] SolarTrans:
That's pretty cool (pun intended) :P

I like screens a little on the cool side, but hopefully it doesn't get much cooler than that.
[One (M8) General] replica9000:
My replacement M8 came in today. Both are from Taiwan. Both have serial numbers that start with HT. The new one is definitely brighter, and the white is more white. The old one seems to have a slightly warmer display compared to the new one.
[One (M8) General] puremind:
What are the respective Panel ID's?
[One (M8) General] replica9000:
They are both m8_sharp_novatek_panel_on
[One (M8) General] andrewnelson:
High quality disply
[One (M8) General] Nekromantik:
Got mine from EE today and serial starts with FA. Taiwan model.

Screen is less bright then my M7 which is not a good thing :(

Not had a chance to compare with in store models to see if I got the warm screen or not.
[One (M8) General] jlevy73:
Just got mine, made in Taiwan FA43T and it's definitely brighter than my m7. It's a tad bit brighter than my N5 as well. The N5 is a bit cooler compared to my M8. Whites are very white on m8 you can see the cooler blues more on the n5.
[One (M8) General] otariq:
Just wondering if you guys have this too. Are the edges of your glass kind of loose and pushable without a lot of force? I can push it down at the left and right edges and it creates that blue streak on the LCD
[One (M8) General] Jooosty:
Take pics to compare

HTC UltimEight ?
[One (M8) General] SolarTrans:
Oh my god that pun is so bad it's greight
[One (M8) General] californiarailroader:
Mine is fine.

---------- Post added at 12:12 AM ---------- Previous post was at 12:11 AM ----------

Great. ;)
[One (M8) General] jlevy73:
When I get back to my computer be happy to.
[One (M8) General] Nekromantik:
Lucky if you got a brighter screen model.

I can still get exchange but cant be bothered to mess about like that.

Will just have to find cover when Im out in the sun! ha ha

Kinda disappointing really. Still got my M7 so can still sell the M8.
[One (M8) General] jlevy73:
M8 vs M7

Here are the comparison shots I promised to post. Using the same browser (dolphin) opened up to google's home page I took a picture using a Z1. The left pic is of the m8 the right is of m7.
[One (M8) General] jlevy73:
M8 vs N5

Same procedure as above this time M8 on the left and the N5 on the right.
[One (M8) General] Jooosty:
Looks like your screen is the cooler variant .

Maybe an expert can chime in.

HTC UltimEight ?
[One (M8) General] DigitalMadness:
Htc One M8 to the left and Nexus 7 (2014) tablet. Full brightness
[One (M8) General] DigitalMadness:
Htc One M8 vs Sony Xperia Z1 in full brightness

Sorry for double post, had to upload the pics from different devices ?
[One (M8) General] Jooosty:
Sony looks warmer

HTC UltimEight ?
[One (M8) General] *Emix*:
[YOUTUBE]0osrpESuFkQ[/YOUTUBE]
[One (M8) General] Jooosty:
According to that video I have a Taiwan unit. I ALMOST exchanged for a Chinese unit. I saw the screen difference and said no way!

HTC UltimEight ?
[One (M8) General] replica9000:
The difference between the Chinese and Taiwanese models shown in the video look similar to the difference between the two Taiwanese models I swapped.
[One (M8) General] EddyOS:
Got a Chinese model, display is quite good IMO! Better than my old Nexus 5 anyway!
[One (M8) General] Jooosty:
What's your serial number ?

To me it seems that the Chinese unit is warmer and possibly not as overblown on the colors.

People may be attracted to either or. So there isn't a better one, we might say.

But it may just come down to preference.

HTC UltimEight ?
[One (M8) General] DigitalMadness:
My phone is from China, SH43AWM and you can see in the pics how it looks like in comparison to Z1 and Nexus 7(2013)
[One (M8) General] b-george:
Got the same problem!

It's also visible when the keyboard is upp with a white background.

Is this a software bug or a defect? I really don't want to exchange my 4th device.
[One (M8) General] DigitalMadness:
I think its normal, i have it to :).. Somebody mentioned this a while ago and i think [MENTION=1144067]hamdir[/MENTION] responded that this is not really a issue :)
[One (M8) General] b-george:
I made som more tests, it's like the backlite is slow to redraw and not a flicker.