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HTC One screen reviews: One comes with different display types

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puremind
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(Last edited by puremind; 13th May 2013 at 07:39 AM.)
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Default HTC One screen reviews: One comes with different display types

HTC One Display Brightness
  • The HTC One uses an adaptative contrast mechanism for the screen brightness that is in operation even when auto-brightness is off. This mechanism means that brightness settles after each picture change only after a 4-5 seconds, which means that measurements that are taken too quickly can overestimate brightness by 15%, which is why there is a wide fluctuation across all reviews.
  • At which level brightness settles depends on the average picture level. You can sometimes observe this while browsing: when the content displayed varies between dark and bright content, an adjustment is visible.
  • In my measurements below, I have indicated the brightness range as well as the typical settled brightness for the standard 100% Voodoo test pattern.



HTC One Black Levels

Like with brightness, black levels also fluctuate due to the adaptative contrast mechanism:
  • Content with darker average picture level will be dimmed
  • Content with brighter content will will brightened
  • Overall black levels will fluctuate between 0.29cd/m and 0.55cd/m, so dynamic contrast will be around 1700:1 whereas ANSI (or intra-picture contrast) will be around 1000:1.

Color Temperature: Three phones, three different display calibrations.

Unit 1 (silver)
  • Fabricated on 12th March 2013 at factory Tierra del Fuego Factory in Argentina (Serial: FA33CWxxxxxx, Panel ID JDI C2_2)
  • Display: color temperature slightly on the cool side
White color temperature: 6950K (some meters will incorrectly measure this up to 350K higher, especially if not using the right spectral file for the type of display)
Black Level: 0.37cd/m to 0.50 cd/m
Black Level (typical voodoo test pattern): 0.43 cd/m
White Point: 370cd/m to 490cd/m
White Point (typical voodoo test pattern): 435cd/m
Typical Contrast (without adaptative mechanism): 1000:1
ANSI Contrast: 1100:1
Unit 2 (silver)
  • Fabricated on 3rd April 2013 at Hsinchu, Taiwan factory (Serial: HT343Wxxxxxx, Panel ID JDI C2_2)
  • Display: neutral color temperature, slightly lower contrat:
White color temperature: 6550K (some meters will incorrectly measure this up to 350K higher, especially if not using the right spectral file for the type of display)
Black Level: 0.50 cd/m to 0.64cd/m
Black Level (typical voodoo test pattern): 0.52 cd/m
White Point: 400cd/m to 530cd/m
White Point (typical voodoo test pattern): 466cd/m
Typical Contrast (with adaptative mechanism): 900:1
Typical ANSI Contrast: 970:1
Unit 3 (black)
  • Fabricated on 12th April 2013 at factory Tierra del Fuego Factory in Argentina (Serial: FA34CWxxxxxx, Panel ID JDI C2_2)
  • Display: Even cooler color temperature unit 1 but same brightness and contrast
White color temperature: 7200K (some meters will incorrectly measure this up to 350K higher, especially if not using the right spectral file for the type of display)
Black Level: 0.37cd/m to 0.50 cd/m
Black Level (typical voodoo test pattern): 0.43 cd/m
White Point: 370cd/m to 490cd/m
White Point (typical voodoo test pattern): 435cd/m
Typical Contrast (without adaptative mechanism): 1000:1
ANSI Contrast: 1100:1
Comparison of warmest color temperature on Unit 2 (left) vs. coolest on Unit 3 (right):




Based on the collective reviews of the HTC One including my own measurements, it is now clear that HTC One displays can have different display characteristics in terms or color temperature, contrast and brightness. Even displays with the same Display ID have can have widely fluctuating brightness and color temperature depending on factory calibration.
  • Settled brightness between 390cd/m and 475cd/m
  • Color Temperature between 6550K to 7350K
  • ANSI contrast between 930:1 and 1100:1
Currently available reviews for the HTC One Display

Neutral Color Temperature
  • 20.03.2013 GBR pcpro: 481cd/m brightness | 1202:1 contrast (measured with i1 Display Pro)
  • 20.03.2013 DEU Computerbase.de: 483cd/m brightness | 1100:1 contrast | 6,600K white temperature (measured with DTP94)
  • 26.03.2013 FRA 01net.fr: 485 cd/m | 0,29 cd/m | 1679:1 contrast | 6638K white temperature (measured with Minolta CA-210 and DTP94)
  • 26.03.2013 FRA Puremind@xda (see below): 466 cd/m | 0,52 cd/m | 939:1 contrast | 6650K white temperature (measured with i1 Pro 2)
Medium-High Color Temperature
  • 26.03.2013 DEU puremind@xda 463cd/m brightness | 1073:1 contrast | 6934K white temperature (measured with i1 Pro)
  • 02.04.2013 DEU notebookcheck.com: 488.9cd /m brightness | 0.23 cd / m black level | 2117:1 contrast | 7205K white temperature
  • 26.02.2013 RUS 3dnews.ru: 382cd/m and 1,258:1 contrast | 6,938K white temperature (measured with Spyder 4)
High Color Temperature
  • 14.03.2013 GBR uk.hardware.info: 426cd/m brightness | 977:1 contrast | 7,820K color temperature (measured with i1 Display Pro)
  • 26.02.2013 RUS 3dnews.ru: 453cd/m and 1,328:1 contrast | 7,598K white temperature (measured with Spyder 4)
  • 14.03.2013 NLD Tweakers.net: 489cd/m | 1159:1 contrast | 8,166 color temperature (measured with i1 Display Pro)
  • 26.03.2013 DEU puremind@xda 420cd/m brightness | 1060:1 contrast | 8,130K color temperature (measured with Chroma 5)
  • 28.03.2013 RUS high-tech@mail.ru 492cd/m brightness | 1189:1 contrast | 7980K white temperature
Unknown color temperature:

14.03.2013 USA laptopmag: 463cd/m brightness
19.03.2013 DEU Notebookjournal: 385cd/m and 1100:1 contrast
19.03.2013 DEU PC Welt 447cd/m brightness | 1711:1 contrast
20.03.2013 DEU Chip.de: 479cd/m brightness | 1020:1 contrast
21.03.2013 FRA Les Numriques 460cd/m | 1568:1 (measured with i1 Pro or i1 Pro 2 tbc.)
21.03.2013 FRA 01.net 480cd/m brightness | 1,655:1 contrast (measured with Konica Minolta CA-210)
23.03.2013 BGR GSMArena: 647cd/m brightness | 1541:1 contrast

Having said that, there are still different display calibrations out there, I myself measured "settled" brightness
I will try and keep this updated with new tests to confirm where each screen type can be found.

For reference, here are the luminance ranges of the color testing devices listed above.
  • i1 pro__________________________ 0.20 cd/m to 300 cd/m
  • i1 pro 2_________________________0.20 cd/m to 1200 cd/m
  • Chroma 5/Sencore Color Pro V_______0.01 cd/m 1000 cd/m
  • Spider 3/4_______________________0.02 cd/m 5000 cd/m
  • i1 Display 2______________._____._.__0.02 cd/m 3000 cd/m
  • i1 Display 3/i1 Display Pro/C6___._____0.003 cd/m 1200 cd/m
  • Konica Minolta CA-210______________0.01cd/m 1000 cd/m
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puremind
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(Last edited by puremind; 26th March 2013 at 09:05 PM.)
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Default Own screen measurements

Here are measurements I conducted today at a Vodafone shop.

White Balance
First of all, let me say that the readings were conducted by i1 Pro, which is certified until 300cd/m. Overall the readings will be very accurate for color temperature, black level, gamma and chromaticty, but maximum brightness may be off by a small margin (to be confimed tomorrow). Unfortunately Calman did not respond to me regarding my license upgrade to Calman5, so I could not use the Chroma5 for this measurement.

I will conduct new readings with the Chroma 5 likely tomorrow. The results are quite close to the PCpro review in terms of brightness and very close to the Russian review in terms of white color temperature (in fact nearly identical). Overall contrast falls in line with most reviews.
  • White point / maximum brightness: 445cd/m
  • Back Level: 0.43cd/m
  • Contrast (dynamic): 1034:1
  • Average gamma: 2.1
  • White color temperature (read the color tmperature section below): 6934K (same as Russian Review)
  • Black color temperature (read the color tmperature section below): 8882K
  • Average color temperature: 7353K



Overall the white balance is good but not perfect.




Color Temperature

The observed white balance translates into color temperature slightly on the cold side but it is colder at low stimulus and warmer towards the white point, which is important for a pleasing browsing experience:



I think displaying color temperature across the whole spectrum is important. Some reviews only mention one value, which can be the average or the white point temperature, but it is hard to interpret taken on its own.


Color decoding / Chromaticity
As far as color accuracy is concerned, the HTC One's display I tested had fairly accurate colors. Only the most critical viewers will detect thes imperfections in daily use.


Based on this measurement, this is more of a type 2 display, however I am not sure about the white point
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BarryH_GEG
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Sites and reviewers test differently. I think if you look at the One X's performance you'll see it varied from site to site too.

Here's GSMArena's testing methodology. You can see how other sites might test differently and get different results because of it. It's more accurate to compare multiple devices on a single site than it is a single device across multiple sites. Assuming each site uses the same standardized tests a One X to SGS3 comparison on tweakers.net would be more relevant than a One X's performance off tweakers.net compared to a SGS3's peformance off GSMArena.

An important note about AMOLEDs is due here. As AMOLED units have the ability to completely switch off individual pixels, their black level readings are 0, which gives them an infinite contrast ratio under the testing conditions.

When we measure we take two readings off each device - first with the display brightness set to 50% and then with the brightness setting pushed all the way up. We test the handsets in complete darkness, because when ambient light is present, the luminance levels of the blacks displayed goes up, and affects the perceived contrast ratio.

Contrast ratio is very heavily influenced by the black levels of a display. While a brighter display would normally have an advantage, it will usually be unable to compensate for insufficiently deep blacks.

Our sunlight legibility test aims to show you how legible each screen remains in bright environments, where screen reflectivity matters as much as its natural contrast and brightness. We use fixed studio lighting to simulate sunlight falling on the phone screens and measure the contrast ratio of each of them, when faced with this powerful light source. We measure each display with brightness turned up to 100%.
 
jasahu
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Default Re: HTC screen reviews: HTC One comes with different display types

Gsmarena is Bulgarian, not American
SGSII 4.0.3, Nexus 4
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Here's a way to find the display type that doesn't require root.


1. Reboot the phone twice to get a clean "last_kmsg" file
2. Use any file manager that gets you to the root directory
3. Navigate to the /proc folder
4. Find "last_kmsg"

\

5. Open it on the device or send it to a PC and open it as a text file. Your looking for "panel_id" and "panel_vendor." It's a long ass file so you're better off using an editor with a search feature to search on "panel."



Since there aren't many vendors making 1080P panels I'll bet all One's use the same panel type and it's probably from Renasis (Sharp) like the XZ and DNA.

The AUO (Acer) display on the Teg3 One X is "0x4940014"
The Sharp display on the Teg3 One X is "0x294000f"
The Sony display on the One XL is"0x18103" (The One XL only uses the Sony panel)
The AUO (Acer) display on the One X+ is 0x944a03 (The One X+ only uses the AUO panel)
The DNA uses a Renasis (Sharp) panel (only) but I can't find the ID
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puremind
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Quote:
Originally Posted by jasahu View Post
Gsmarena is Bulgarian, not American
Thanks I was looking for that information yesterday but could not find it. Do you know if this is the parent or did the testers also receive a Bulgarian unit?
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Quote:
Originally Posted by BarryH_GEG View Post
Sites and reviewers test differently. I think if you look at the One X's performance you'll see it varied from site to site too.

Here's GSMArena's testing methodology. You can see how other sites might test differently and get different results because of it. It's more accurate to compare multiple devices on a single site than it is a single device across multiple sites. Assuming each site uses the same standardized tests a One X to SGS3 comparison on tweakers.net would be more relevant than a One X's performance off tweakers.net compared to a SGS3's peformance off GSMArena.
I agree with you with regards to black levels but not for brightness.
  • Brightness cannot move by more than 10% depending on measurement device or testing protocol
  • Calibration usually never reduces brightness either by more than 15%, except of course if you are calibrating an AMOLED to neutral color temperature.
The fact that there are several display types makes no doubt to me, as HTC like many others used that approach in the past and the brightness results are too different.
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puremind
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Quote:
Originally Posted by BarryH_GEG View Post
Here's a way to find the display type that doesn't require root.


1. Reboot the phone twice to get a clean "last_kmsg" file
2. Use any file manager that gets you to the root directory
3. Navigate to the /proc folder
4. Find "last_kmsg"

\

5. Open it on the device or send it to a PC and open it as a text file. Your looking for "panel_id" and "panel_vendor." It's a long ass file so you're better off using an editor with a search feature to search on "panel."

Since there aren't many vendors making 1080P panels I'll bet all One's use the same panel type and it's probably from Renasis (Sharp) like the XZ and DNA.

The AUO (Acer) display on the Teg3 One X is "0x4940014"
The Sharp display on the Teg3 One X is "0x294000f"
The Sony display on the One XL is"0x18103" (The One XL only uses the Sony panel)
The AUO (Acer) display on the One X+ is 0x944a03 (The One X+ only uses the AUO panel)
The DNA uses a Renasis (Sharp) panel (only) but I can't find the ID
Great stuff I will go to the shops and check it out. Why can't you find the ID on the DNA?
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Maedhros
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I made a thread about this earlier, but I only got troll responses.

Hope this thread receives actual input, this is kind of an important thing for me.
 
jonstatt
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Hate to throw a spanner in the works here, but it may also be that different firmwares are producing different default colour temperatures. With the One X there were indeed three manufacturers of screen. For the European models it was Acer and Sharp. Acer had been colour fidelity, but less uniform, and not as bright. The sharp was a light cannon, but very cool colour temperature, and better uniformity. However, HTC reduced the disparity through firmware updates!

Therefore, the only true way is if we can find a reliable way of finding the vendor code such as in the log file.

Also I can tell you that I had a Sony Xperia last year. Even though all the screens are made by Sony, there was a huge variance between two supposedly identical phones, as I found out when I compared to a friends.

---------- Post added at 01:35 PM ---------- Previous post was at 01:30 PM ----------

Quote:
Originally Posted by BarryH_GEG View Post

The AUO (Acer) display on the Teg3 One X is "0x4940014"
The Sharp display on the Teg3 One X is "0x294000f"
The Sony display on the One XL is"0x18103" (The One XL only uses the Sony panel)
The AUO (Acer) display on the One X+ is 0x944a03 (The One X+ only uses the AUO panel)
The DNA uses a Renasis (Sharp) panel (only) but I can't find the ID
Absolutely spot on accuracy here. I confirmed the One X+ my wife bought had an identical characteristic to the One X Acer screen I had before. However they seem to have improved the uniformity issues from my original One X.

I also have a suspicion that at least my One uses a Sharp panel and has a number of characteristics similar to the Sharp screen used on the One X. It has a colour temperature that is a bit on the cool side for sure. Although I haven't measured yet, I have a keen eye, and I would have said it was a little over 7000K. I also compared it to my wife's One X+ and it is a bit cooler, but not rediculous (nothing like the S3 which was wildly off). We may find a future firmware update corrects this if the variance between One's with sharp panels is not too severe.

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