HTC One Display - Luck of the Draw...

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puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
HTC did it again but worse. Last year displays were different in color temperature but maintained similar contrast. This year the difference in display calibration is worse.
  • Before receiving my own unit, I tested 2 devices in the shops. The first one had worse contrast and too low gamma (less punchy brightness transition from dark to light tones). I was disappointed with the display (let's call it Type A).
  • Later on, I went to another shop and the display looked gorgeous. Higher contrast, accurate gamma and more neutral greyscales (let's call it type B).

Today I received my unit and unfortunately, the display was Type A display. Here are the results of the "poorer display". Unlike last year, it is not possible to determine the actual display ID by looking this up in the last_ksmg file in the proc folder under the root. The access is denied. So unless we root a device, we cannot determine the display ID.

As can be seen below, the color temperature and greyscale accuracy is mediocre. Contrast is only average. Chromaticity overall is good but red is oversaturated.
  • Brightness: 503cd/m²
  • True Contrast: 1,000:1
  • Dynamic Contrast: 1378:1
  • White Color Temperature: 7395°K
  • Average Color Temperature: 7417°K
Note that on this display, the i1 Dislay pro used by many press reviewers will overestimate color temperature by 5.5% on this particular display. So if you see values around 7900°K, this is broadly equivalent to the 7,400°K that I (and Anandtech) measured. UK Harware review probably also had a Type A display however the contrat values are likely due to methodology.

Although I haven't tested extensively, I can already tell that the dynamic brightness adjustment is still taking place, though it works differently v. last year's implementation. This is why the contrast values observed in the press reviews very widely between 980:1 and over 2300:1!

I will be measuring Type B displays in the shops to nail down the differences based on the same methodology (100% Voodoo Test patterns).

attachment.php


Greyscale

attachment.php


Color Space

attachment.php



Currently available reviews for the HTC One Display pending

Tests in English

  • 25.03.2013 BGR GSMArena: 567cd/m² Brightness | 1,256:1 Contrast
    26.03.2013 USA Anandtech: 497cd/m² Brightness | 1,300:1 Contrast | 7,341 Color Temperature (Delta E = 5.2)| Chromaticity: excelllent (Delta E = 3.87)
  • 20.03.2013 GBR pcpro: Brightness not mentioned | 1,687:1 Contrast (measured with i1 Display Pro)
  • 14.03.2013 GBR uk.hardware.info: 508cd/m² Brightness | Black Level: 0.2cd/m² | 2,541:1 Contrast | 7,856K Color Temperature (measured with i1 Display Pro)
    25.03.2013 USA laptopmag: 447cd/m² Brightness | Chromaticity: Good (Delta E = 6.1)

German
  • 20.03.2013 DEU Computerbase.de: Not yet published DTP94)
    04.04.2013 DEU PC Welt 454cd/m² brightness | 2,555:1 contrast
    31.03.2013 DEU Chip.de: 482cd/m² brightness | 1420:1 contrast
  • 02.04.2013 DEU notebookcheck.com: Not yet published

Dutch
  • 02.04.2013 NLD Tweakers.net: 505cd/m² | 1,624:1 contrast | 7,005 color temperature (Delta E = 7.7)| Excellent Chromaticity (Delta E = 4,78) (measured with i1 Display Pro)

Russian
  • 26.02.2013 RUS 3dnews.ru: Not yet published (measured with Spyder 4)
  • 03.04.2013 RUS [email protected] 486cd/m² brightness | 988:1 contrast (1300:1 dynamic) | 8,000K white temperature

French

  • 03.04.2013 FRA Les Numériques 480cd/m² | Contrast 1279:1 | Chromaticity: good (Delta E = 4,5) (measured with i1 Pro or i1 Pro 2 tbc.)
    02.02.2013 FRA 01.net 527cd/m² brightness | 2,509:1 contrast (measured with Konica Minolta CA-210)



For reference, here are the luminance ranges of the color testing devices listed above.
  • i1 pro__________________________ 0.20 cd/m² to 300 cd/m²
  • i1 pro 2_________________________0.20 cd/m² to 1200 cd/m²
  • Chroma 5/Sencore Color Pro V_______0.01 cd/m² 1000 cd/m²
  • Spider 3/4_______________________0.02 cd/m² 5000 cd/m²
  • i1 Display 2______________._____._.__0.02 cd/m² 3000 cd/m²
  • i1 Display 3/i1 Display Pro/C6___._____0.003 cd/m² 1200 cd/m²
  • Konica Minolta CA-210______________0.01cd/m² 1000 cd/m²
 

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puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
Apparently the HTC One's diplay latency is record breaking - measured at 46ms.

Source: Lesnumeriques.fr

It is not at the 1-20ms recommended by Microsoft but it is a great step forward considering the fact that modern devices barely go below 70ms. The previous record was held by the Note 3 with 67ms.

Newer devices:
  • Note 3: 67ms
  • LG G2: 110ms
  • iPhone 53: 75ms

Here is an overview for older devices:

attachment.php


It will be interesting to track the performance of other devices: S5, Z2, etc...

Source
Lesnumeriques.fr
 
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robt772000

Senior Member
Mar 21, 2010
566
65
Is the new M8 like the M7 having sharp and jdi as it's suppliers? I'm thinking mine is a jdi from comparison with my sharp M7.
 

StickyGeko

Senior Member
Mar 13, 2011
221
22
Blackburn
Guys how do you find the colours on the m8.... My reds are way over saturated... Is there a way to make them cooler?

Sent from my Nexus 4 using XDA Premium 4 mobile app
 

puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
Guys how do you find the colours on the m8.... My reds are way over saturated... Is there a way to make them cooler?

Sent from my Nexus 4 using XDA Premium 4 mobile app

The reds are not oversaturated. What you mean is the grey balance is too warm. Saturation and greyscale Balance are two different things.

None of the Displays on the M8 are overly warm. They are actually cooler than the norm. If you feel there is a red push, then probably you are coming from an AMOLED Display wich typically have more green and blue but is incorrect.
 

StickyGeko

Senior Member
Mar 13, 2011
221
22
Blackburn
No.... What I mean is the reds are over saturated.... I have an n4.... The reds on my m8 are way off, side by side with n4, HTC 8s, nexus 7 and a galaxy tab3...m8 reds are way off, maybe I have a defective unit.... I just wanted to see if anyone else had the same issue

Sent from my Nexus 4 using XDA Premium 4 mobile app
 

puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
No.... What I mean is the reds are over saturated.... I have an n4.... The reds on my m8 are way off, side by side with n4, HTC 8s, nexus 7 and a galaxy tab3...m8 reds are way off, maybe I have a defective unit.... I just wanted to see if anyone else had the same issue

Sent from my Nexus 4 using XDA Premium 4 mobile app

Do you see that on the color red? What do you mean by reds are cooler?

Saturation has nothing to do with color temperature. It has to do with the intensity of the color, not ist hue (which can be shifted toward other colors). For example, a red that is too blue move slightly towards purple and a red that is too green moves slightly towards orange.

Hence my question. If you say your reds are too cool, then it must mean they are too purple.

Saturation means how intensive the color is. If the reds are undersaturated they move towards grey and if they are oversaturated, they move towards "more intense" red. Overaturation cannot be described as cooler but you said your reds were cooler, so probably you mean your color temperature is too cool, hence greys and intermediary colors are shifted towards blue?

As you can see from the Review listed above, the M8 can have color temperature that is on the cool side (>7000K), however this varies from unit to unit, last year color temperature varied from 6,500K to 8,000K with Color temperature decreasing over time (probably because the intensity of the blue pixels decreased faster before settling).

If you feel your display is too cool, it is not a defect, it is luck of the draw. Many people actually prefered the slightly bluer displays last year because they had slightly larger contrast.but also because most displays are cooler by nature (since sunlight is warm and will cancel out the coolness when looking at the display outdoor.

The N4 had excellent grey balance, so probably your eye got used to a more neutral display. Wait a little bit and see how your perception adjusts. If you really don't like it, then return your device and purchase another one...

So far only a few reviews measured color temperature, and the values ranged from 7000K (pretty neutral) to 8,000K (cool) but it is also possible that some displays will have lower temperature (it was the case last year). I will receive my device tomorrow, so I will let you know how my unit stacks up.
 
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puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
No.... What I mean is the reds are over saturated.... I have an n4.... The reds on my m8 are way off, side by side with n4, HTC 8s, nexus 7 and a galaxy tab3...m8 reds are way off, maybe I have a defective unit.... I just wanted to see if anyone else had the same issue

Sent from my Nexus 4 using XDA Premium 4 mobile app

Based on my test above, the reds are indeed oversaturated and the display is on the cool side, but both are independent. The reds can be oversaturated without being cool and the display can be cool without oversaturated reds.
 
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puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
@puremind do you keep in mind that the M7/M8 feature dynamic contrast? maybe that's what's affecting the results?

Dynamic contrast is only affecting constrast, not color temperature. I noted that in my post (and also under one of the Russian tests in my list) and the the contrast is 1,000:1 vs 1,300:1 dynamic.

Still these results are not so good on the Type A display.

Also I did compare two units in store, so I can really tell one unit had a much much better display. Last year displays were broadly equivalent except for brightness but this year the Type A display is quite poor (by my picky standards) and cannot compete with Samsung S5's Display. The 2.1 gamma means intermediary colors are a bit washed out. The display is not punchy and has no depth. So be careful what you get! My unit will go back. This is the display type tested by Anandtech, as they noted the same issues.
 
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Maedhros

Senior Member
Sep 24, 2008
996
128
Toronto
How do we determine what screen we have?

If reds don't appear to be over saturated can we assume we have the type B screen?
 

puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
How do we determine what screen we have?

If reds don't appear to be over saturated can we assume we have the type B screen?

Red oversaturation is not the most visible aspect. The lack of punchiness and slightly washed out intermediary colors and lack of contrast is easier to spot.

When I am back from London I will measure type B and I expect to see correct gamma and higher contrast.

If you have rooted your phone you can use ES explorer or root explorer to view the last_ksmg file in the root's proc folder. If you look for Display ID you should find it there. It will likely say JDI something or Sharp something.

However it is not guaranteed that the display manufacturer will be different as JDI have a track record of having wide variance in terms of display characteristics. Still the displays are different enough that they could be from different manufacturers.

If anyone has access to a rooted device and can do the test it would be very helpful. Please comment what your subjective impression of the screen is and provide your display ID.
 
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Maedhros

Senior Member
Sep 24, 2008
996
128
Toronto
Red oversaturation is not the most visible aspect. The lack of punchiness and slightly washed out intermediary colors and lack of contrast is easier to spot.

When I am back from London I will measure type B and I expect to see correct gamma and higher contrast.

Thank you,

Could you also take pictures comparing the two models if possible?

Without context it is slightly difficult to determine what exactly constitutes "lack of punchiness and slightly washed out intermediary colors and lack of contrast."

Sorry - I'm not a bit of a noob when it comes to displays and colors!
 

puremind

Senior Member
Feb 24, 2008
1,191
477
Frankfurt
Thank you,

Could you also take pictures comparing the two models if possible?

Without context it is slightly difficult to determine what exactly constitutes "lack of punchiness and slightly washed out intermediary colors and lack of contrast."

Sorry - I'm not a bit of a noob when it comes to displays and colors!

I don't posses both units. The other display type is in store and I am traveling to London the whole week. If I spot a good display at the airport or somewhere else I can shoot a comparison.
 
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v-b-n

Senior Member
Feb 17, 2010
2,614
963
Singapore
This is what I have ... Singapore Grey variant

mdss_dsi_panel_init: Panel Name = m8 1080p sharp/NT35595 cmd mode dsi panel
mdss_dsi_panel_init:1006 Continuous splash flag not found.

And another place name mentioned as "mdss_dsi_m8_sharp_novatek_35595_1080p"

To my naked eyes, it looks ok but little on the warm side (yellowish whites)
 

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  • 12
    HTC did it again but worse. Last year displays were different in color temperature but maintained similar contrast. This year the difference in display calibration is worse.
    • Before receiving my own unit, I tested 2 devices in the shops. The first one had worse contrast and too low gamma (less punchy brightness transition from dark to light tones). I was disappointed with the display (let's call it Type A).
    • Later on, I went to another shop and the display looked gorgeous. Higher contrast, accurate gamma and more neutral greyscales (let's call it type B).

    Today I received my unit and unfortunately, the display was Type A display. Here are the results of the "poorer display". Unlike last year, it is not possible to determine the actual display ID by looking this up in the last_ksmg file in the proc folder under the root. The access is denied. So unless we root a device, we cannot determine the display ID.

    As can be seen below, the color temperature and greyscale accuracy is mediocre. Contrast is only average. Chromaticity overall is good but red is oversaturated.
    • Brightness: 503cd/m²
    • True Contrast: 1,000:1
    • Dynamic Contrast: 1378:1
    • White Color Temperature: 7395°K
    • Average Color Temperature: 7417°K
    Note that on this display, the i1 Dislay pro used by many press reviewers will overestimate color temperature by 5.5% on this particular display. So if you see values around 7900°K, this is broadly equivalent to the 7,400°K that I (and Anandtech) measured. UK Harware review probably also had a Type A display however the contrat values are likely due to methodology.

    Although I haven't tested extensively, I can already tell that the dynamic brightness adjustment is still taking place, though it works differently v. last year's implementation. This is why the contrast values observed in the press reviews very widely between 980:1 and over 2300:1!

    I will be measuring Type B displays in the shops to nail down the differences based on the same methodology (100% Voodoo Test patterns).

    attachment.php


    Greyscale

    attachment.php


    Color Space

    attachment.php



    Currently available reviews for the HTC One Display pending

    Tests in English

    • 25.03.2013 BGR GSMArena: 567cd/m² Brightness | 1,256:1 Contrast
      26.03.2013 USA Anandtech: 497cd/m² Brightness | 1,300:1 Contrast | 7,341 Color Temperature (Delta E = 5.2)| Chromaticity: excelllent (Delta E = 3.87)
    • 20.03.2013 GBR pcpro: Brightness not mentioned | 1,687:1 Contrast (measured with i1 Display Pro)
    • 14.03.2013 GBR uk.hardware.info: 508cd/m² Brightness | Black Level: 0.2cd/m² | 2,541:1 Contrast | 7,856K Color Temperature (measured with i1 Display Pro)
      25.03.2013 USA laptopmag: 447cd/m² Brightness | Chromaticity: Good (Delta E = 6.1)

    German
    • 20.03.2013 DEU Computerbase.de: Not yet published DTP94)
      04.04.2013 DEU PC Welt 454cd/m² brightness | 2,555:1 contrast
      31.03.2013 DEU Chip.de: 482cd/m² brightness | 1420:1 contrast
    • 02.04.2013 DEU notebookcheck.com: Not yet published

    Dutch
    • 02.04.2013 NLD Tweakers.net: 505cd/m² | 1,624:1 contrast | 7,005 color temperature (Delta E = 7.7)| Excellent Chromaticity (Delta E = 4,78) (measured with i1 Display Pro)

    Russian
    • 26.02.2013 RUS 3dnews.ru: Not yet published (measured with Spyder 4)
    • 03.04.2013 RUS [email protected] 486cd/m² brightness | 988:1 contrast (1300:1 dynamic) | 8,000K white temperature

    French

    • 03.04.2013 FRA Les Numériques 480cd/m² | Contrast 1279:1 | Chromaticity: good (Delta E = 4,5) (measured with i1 Pro or i1 Pro 2 tbc.)
      02.02.2013 FRA 01.net 527cd/m² brightness | 2,509:1 contrast (measured with Konica Minolta CA-210)



    For reference, here are the luminance ranges of the color testing devices listed above.
    • i1 pro__________________________ 0.20 cd/m² to 300 cd/m²
    • i1 pro 2_________________________0.20 cd/m² to 1200 cd/m²
    • Chroma 5/Sencore Color Pro V_______0.01 cd/m² 1000 cd/m²
    • Spider 3/4_______________________0.02 cd/m² 5000 cd/m²
    • i1 Display 2______________._____._.__0.02 cd/m² 3000 cd/m²
    • i1 Display 3/i1 Display Pro/C6___._____0.003 cd/m² 1200 cd/m²
    • Konica Minolta CA-210______________0.01cd/m² 1000 cd/m²
    3
    Hello puremind and guys!

    Thanks for your effort measuring displays ;)
    Erica Griffin pointed me here as she noticed you were using my old pattern generation app, and it's pretty obsolete now.
    Since I work on a new project that allows fully automated mobile display measurements, with smarter patterns that fight against several kind of dynamic contrast implementation I observed that there was a bug in the saturation generator in the old app.

    Because using the generator app manually is very slow and frustrating, I deprecated. Instead, there's complete color science algorithm and even an original calibration profile generator in my new software, that I describe in this Google+ community and blog about on Google+

    Sorry it's been a long time I posted on XDA about all this, lately I was only focusing on pure R&D to bring out new stuff and not being distracted.

    I just updated the voodoo screen test patterns app description on Play Store describing the bug: the saturation points are not placed linearly.
    If you really like this app an rely on it I suppose I could push a last update with the RGB value fixed so let me know.

    I assumed nobody was using it given the absence of feedback but it seems not :D
    2
    hi guys...i bought htc one m8 2 days ago ( Made in china )

    i check the last_kmsg file of my M8 and found this :

    mdss_dsi_m8_lg_novatek_35595_1080p

    my display is LG
    2
    Brightness took a hit? Did you calibrate using trickster mod similar to my settings?
    I'm getting annoyed. Seriously look at Z2 now.

    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 @supercurio 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.
    1
    Apparently the HTC One's diplay latency is record breaking - measured at 46ms.

    Source: Lesnumeriques.fr

    It is not at the 1-20ms recommended by Microsoft but it is a great step forward considering the fact that modern devices barely go below 70ms. The previous record was held by the Note 3 with 67ms.

    Newer devices:
    • Note 3: 67ms
    • LG G2: 110ms
    • iPhone 53: 75ms

    Here is an overview for older devices:

    attachment.php


    It will be interesting to track the performance of other devices: S5, Z2, etc...

    Source
    Lesnumeriques.fr