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Samsung unveils the Galaxy S4, with a 5" Full-HD (441 PPI) Super AMOLED display

March 15, 2013, 12:58 am
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Samsung unveiled their new flagship smartphone, the Galaxy S4. As expected, it sports a 4.99" Full-HD (1920x1080, 441 PPI) Super AMOLED display behind a Corning Gorilla Glass 3. This phone will launch towards the end of April worldwide (on 327 carriers in 155 countries). The S4 seems to be more of an upgrade to the S3 than a revolutionary new handset.

According to previous reports, Samsung Display started producing these 5" Full-HD AMOLED panels in February at a rate of 3 million units per moth (this will grow to almost 10 million monthly units in coming months). The S3 is Samsung's best selling and fastest selling smartphone, and obviously the company hopes that the S4 will sell even better.

There are two interesting questions regarding the OLED display. According to reports, Samsung finally started using green PHOLED materials, which will increase the efficiency by 25%. I thought they will actually brand this display differently to make sure everybody know how efficient the display is (Motorola for example is using some Samsung made OLEDs with green PHOLEDs and they call these display Super AMOLED Advanced).

It'll be difficult to know this just by comparing the S4 to the S3. The battery on the S4 is larger by 23% compared to the S3 battery (2,600mAh compared to 2,100mAh), the display is larger (5" vs 4.8") and the CPU is different. If Samsung won't tell us directly, we'll know when Universal Display reports their next financial results and break down green PHOLED shipments.

The second question is what is the sub-pixel design. According our sources, Samsung has adopted diamond pixels in these new displays. A Chinese blog posted the following photo (comparing the S4, S3 and Note II) even before the official announcement, but it does seem legit. When Samsung announced the Note II they did not discuss the unique subpixel matrix, so I'm guessing we won't hear anything from Samsung on the S4. When the phone launches I'm sure someone will photo the subpixels and we'll know for sure.

Just to round up the S4 specs - it uses an Octacore 1.6Ghz Exynos CPU (some models use a Quadcore 1.9Ghz Qualcomm CPU), 2GB of memory, 13 mp camera and a 2,600mAh battery. The S4 is actually a bit smaller (8% thinner) and lighter than the S3, despite having a larger display and a larger battery (2,600mAh compared to 2,100mAh). As was with the S3, it seems that Samsung's main focus is in the software features, and the S4 includes all sorts of new software features and options.

Sources and more info: Engadget (1, 2), Android Authority

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Diamond Pixel: the unique GS4 sub pixel arrangement

April 28, 2013, 10:53 am
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When Samsung launched the GS4, they said the Super AMOLED display uses PenTile. Back in January, it was reported that Samsung will adopt a new subpixel scheme that uses diamond sub-pixels, but up until now we didn't hear anything official from Samsung. Today the company finally did acknowledge the new design, and published two closeup photos of the GS4 display.

Diamond Pixel, as Samsung's calls their new design, is a PenTile subpixel scheme, in which there are twice as many green subpixels as there are blue and red ones. The green subpixels are oval and small while the red and blue ones are diamond-shaped and larger (the blue subpixel is slightly larger than the red one). DisplayMate says that this is because green is the most efficient (and long lasting) OLED emitter while the blue has the shortest lifetime.

According to DisplayMate, the diamond shapes were chosen to maximize the sub-pixel packing and achieve the highest possible PPI (the GS4's OLED has 441 PPI). The greens are oval because they are squeezed between the larger red and blue ones. In any case, reviews of this display has been terrific, so this design seems to be a very good one.

Source: Displaymate

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Samsung's KN55S9C sub-pixel design

September 1, 2013, 3:50 am
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French site Lesnumeriques posted an article on Samsung's KN55S9C curved OLED TV, in which they include a macro-photo showing the TV's sub pixels up close:

As you can see, the blue subpixels are bigger than the red and green ones (about twice as large). This was designed this way because the blue OLED has the lowest lifetime - if it is bigger then you can lower the brightness and so conserve lifetime. We've seen many OLED displays with differently-sized subpixels - including PenTile ones and the rather unique display used in the Note 2.

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Speculation on the Galaxy Note 3 sub-pixel arrangement

September 10, 2013, 4:47 am
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When Samsung unveiled the Galaxy Note 3 they said it's got a 5.7" Full-HD Super AMOLED display (386 PPI) - but they didn't reveal what is the sub-pixel arrangement. Some sites say it is a Pentile display while other say it not.

Galaxy Note 3 display up close

According to Chinese site RBMen, the Note 3 uses a Diamond Pixel architecture - similarly to the Galaxy S4. Diamond Pixel is indeed a PenTile subpixel scheme, and there are twice as many green subpixels as there are blue and red ones. The green subpixels are oval and small while the red and blue ones are diamond-shaped and larger. So perhaps both reports are right: it is indeed a PenTile display, but not a regular one...

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DisplayMate: the Galaxy Note 3 has the best performing OLED display ever, beats LCDs across the board

October 1, 2013, 5:59 am
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DisplayMate, the display testing, measurement and calibration experts just got their hands on a pre-release Galaxy Note 3 production unit, with its 5.7" Full-HD Super AMOLED display (386 PPI, PenTile). They put the unit to extensive testing (and also compared it to the Note 2). The conclusion? This is the best performing OLED display ever and it beats LCDs across the board!

The most notable advancement in this new panel is the high brightness. It can achieve 660 cd/m2 in high ambient light. It's not just 55% brighter than the Note 2, it's actually the brightest display ever tested at DisplayMate. A very notable achievement for Samsung's OLEDs, which were lagging behind LCDs in brightness.

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Will Oculus Rift adopt an OLED display for their consumer HMD?

November 14, 2013, 3:01 am
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The Oculus Rift is a VR HMD being developed by Oculus VR. The high profile company raised $16 million (partly by crowdfunding) and already offer "development kits" HMDs. Their consumer version (Oculus CV) will hopefully be released in 2014 and will feature improved components, for example a Full-HD display. The current versions use LCD displays (7" in size, although early prototypes used 5.6").

Oculus VR development edition

Yesterday, at Oculus' development forums, a new discussion suggests that Oculus aims to adopt an OLED display in the Oculus CV. They quote Oculus CEO Brandon Iribe as saying that the need a much faster display than the current one, and that OLED was the technology that could achieve that.

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Visionox's new Z-Type AMOLED RGB sub-pixel arrangement reaches 570 PPI

April 21, 2014, 6:24 am
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Visionox developed a new RGB pixel arrangement for OLED technologies that allowed them to reach 570 PPI. The company refers to this new technology as Z-Type arrangement and it includes 3 sub-pixels (RGB) per pixel (unlike Samsung's Pentile displays). The sub-pixels are densely packed (the aperture ratio seems very high) in a way that does not suffer from jagged edges.

Visionox told me that they cannot yet say when such displays can be commercialized, as there are still manufacturing challenges to overcome. In the meanwhile the company applied for both Chinese and international patents.

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The GS5 Diamond Pixel architecture is not the same as the GS4

April 25, 2014, 6:31 am
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When Samsung first released the GS5, we thought the 5.1" FHD Super AMOLED display is pretty similar to the 4.99" FHD one used in the GS4. But DisplayMate found out that this is a much superior display in many aspects, one of them being that it is 27% more efficient.

GS5 subpixelsGS4 subpixels

Samsung told DisplayMate that the improvement mostly came from more efficient OLED materials. They also incorporated new display electronics and optics and that helped as well. But now Chipworks posted a teardown of the GS5, and they published a macro image of the display's sub pixels. It turns out that it's a different architecture than the GS4, and this may explains some of the performance boost, too.

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DisplayMate: the OLED displays in Samsung's new tablets are the best tablet displays ever tested

June 24, 2014, 10:25 am
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DisplayMate posted yet another interesting display shoot-out, this one testing Samsung's new QHD (2560x1600) Super AMOLED displays used in the upcoming Galaxy Tab S (8.4 and 10.5) tablets. As these displays are very similar to the GS5 display, it's not surprising that DisplayMate found those tablets to offer the best performing displays ever. This is yet another testimony to how great OLED displays are - and the rate of improvement in OLEDs is very rapid.

As DisplayMate found out, the Galaxy Tab S establishes new records for best Tablet display performance in: Highest Color Accuracy, Infinite Contrast Ratio, Lowest Screen Reflectance, and smallest Brightness Variation with Viewing Angle. These are also the highest resolution tablets at QHD.

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Tianma shows a 5.5" Full-HD AMOLED prototype

April 15, 2015, 4:37 am
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The OLED Association reports that Shanghai Tianma demonstrated a new 5.5" Full-HD (400 PPI) AMOLED prototype. This is the highest-resolution display ever shown by the Chinese display maker, and reportedly they have adopted a subpixel scheme not unlike Samsung's Pentile technology. To achieve the high resolution, Tianma developed a dual-FMM technology in-house.

Tianma 5.5'' FHD AMOLED prototype photo

Tianma has been developing LTPS AMOLED technology for quite a while, and according to our information they are getting ready to release the first panels in 2016. Tianma has plans for three separate OLED production lines.

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eMagin reports their financial results for Q3 2015, updates on direct-emission displays and AR/VR efforts

November 12, 2015, 11:40 pm
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eMagin, the OLED microdisplay maker, reported their financial results for Q3 2015. Revenues were $5.4 million - down from $7 million in Q2 2015 due to a decrease in both product sales and R&D contract revenue. Net loss was $2.2 million, and eMagin currently has $5.1 million in cash and equivalents.

eMagin SXGA OLED-XL microdisplay photoAn eMagin OLED microdisplay

eMagin decreased its revenue guidance for 2015 and now anticipates annual revenues of $24 million or above. A couple of months ago eMagin has entered into an agreement with Craig-Hallum Capital Group that will allow them to raise up to $4.5 million.

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SDC developed a 806 PPI OLED display for VR applications

June 5, 2016, 11:36 pm
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Samsung Display developed a new high-resolution OLED display, specifically for VR applications. The 5.5" panel, on display at SID DisplayWeek, sported a 3840x2160 resolution - or 806 PPI. The panel offered a brightness of 350 nits and a color gamut of 97% adobe RGB.

SDC 806 PPI VR OLED at SID 2016

This is the highest resolution mobile phone sized OLED ever demonstrated, and it exactly matches the highest resolution LCD - Sharp's 5.5" 806 PPI IGZO panel unveiled in 2015. Samsung's display probably uses some sort of PenTile architecture, though, so actual sub-pixel count is smaller.

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Nouvoyance explains why PenTile OLEDs last longer

August 5, 2012, 12:06 am
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A few months ago Samsung said that the new Galaxy S3 has a Pentile display (a 4.8" 1280x720 HD Super AMOLED one to be exact) because PenTile increased the lifetime of OLED panels. I have discussed this with Joel Pollack, an Executive VP at Nouvoyance (Samsung's company that developed the PenTile matrix scheme), and he explains this claim further.

An OLED display is made from colored (RGB) sub pixels. A blue OLED has the lowest luminous efficiency (lower then red and green) and so needs to be driven at higher current - which means a lower lifetime.

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Samsung announces the Galaxy Note II: 5.5" glass-based Super AMOLED HD (1280x720) display

August 30, 2012, 11:16 pm
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Samsung announced the successor to the popular "Phablet"Galaxy Note, the Note 2 - with a 5.5"HD Super AMOLED display (1280x720, non-Pentile). Yes - this is a 'regular' glass based AMOLED panel, and not a plastic-based flexible YOUM panel as earlier rumors suggested. I guess we'll have to wait some more for Samsung's first flexible-OLED device, due in 2012 (it'll probably have a much smaller panel).

Galaxy Note II

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The Galaxy Note 2 uses a non-pentile OLED display at 267 PPI

September 5, 2012, 12:27 am
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When Samsung announced the Galaxy Note 2, with its 5.5" 1280x720 HD Super AMOLED display, I assumed it was a Pentile display. But it seems that the Note 2 actually uses an RGB matrix in a unique arrangement (see the photo below). Samsung calls this new matrix S-Stripe. This is rather confusing on several accounts - mostly because up till now Samsung used the brand Super AMOLED Plus for non-pentile OLEDs.

Samsung S-Stripe Matrix

Just a few weeks ago we explained that Pentile OLED displays enable higher lifetime, and we were told that for an RGB OLED with over 230 PPI, lifetime becomes too low for Samsung and they choose Pentile in those displays. But the Note II has a PPI of 267 - the highest PPI non-Pentile OLED. This means it has a lower lifetime compared to a Pentile display (but the advantage is that there's no visible Pentile pattern of course).

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Does the Galaxy Note 2 use Ignis' AdMo-p technology?

September 6, 2012, 6:19 am
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Yesterday I posted about the Galaxy Note 2 subpixl scheme, with the 5.5" 1280x720 HD Super AMOLED display featuring 267 ppi (with three subpixels per pixel). Our readers pointed out that the new scheme used in the Note 2 looks very much like Ingis Innovations' patented HR pixel structure (as part of their AdMo-p technology). This may explain how Samsung managed to get good enough lifetime at such a high PPI without PenTile.

Just as a reminder, here's how the Note 2 pixels are arranged. It's not exaclty the same as in the HR structure as the red and green sub-pixels have the same size. In any case:

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DisplayMate - the iPhone 5 LCD display is superior to the S3 AMOLED

September 25, 2012, 2:55 am
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Update: I just talked to DisplayMate's Raymond Soneira, and he says that the power-consumption test was done on an all-white screen. This is the worst-case scenario for an OLED, and so real-world results will be better (depending on your typical phone usage of course). 

DisplayMate posted an interesting and comprehensive comparison between the iphone 5 IPS-LCD and the Super AMOLED HD display used in the Galaxy S3. They say that the iPhone's display is superior - its a very accurate display, and it's the best Smartphone display they have ever seen. It's actually quite an improvement over the display used in the iPhone 4S.

Apple iPhone 5Samsung Galaxy S3

DisplayMate says that the OLED display on the S3 is not as bright as the LCD, it is less readable in high ambient lighting, it has saturated green and distorted and exaggerated colors. They still complain about Samsung not calibrating the color gamut. On the other hand, they say that OLED is a new technology and hasn't been refined to the same degree as LCDs yet. They still say OLEDs have a very promising future.

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The Galaxy Note 2 launches in Korea, will soon launch worldwide

September 26, 2012, 7:51 am
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Samsung announced today that the Galaxy Note 2 has launched in South Korea. It will soon launch worldwide in 128 countries via 260 mobile carriers. The Note II is the successor to the popular "Phablet"Galaxy Note. This large phone/tablet has a 5.5"HD Super AMOLED display (1280x720, non-Pentile), a quad-core 1.6Ghz processor and a large 3,100mAh battery. The Note II is only 9.4mm thick.

The Note 2 uses a unique RGB sub-pixel scheme (@267 PPI) - not Pentile, but also not a classic RGB strip. It may be that the Note 2 uses Ignis' AdMo-p technology.

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Will Samsung use diamond or hexagonal sub pixels in their new AMOLEDs?

January 23, 2013, 1:42 am
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According to Digitimes, Samsung's upcoming "next-gen" AMOLED panels will use a new pixel layout. Reportedly, Samsung are developing hexagon and diamond shaped pixels. This means that Samsung will increase the resolution but the picture will suffer due to jagged pixel artifacts and blurring. It's probably that at such high pixel density this won't actually be noticed, but still.

In the Galaxy Note II Samsung introduced a new sub-pixel scheme, an RGB matrix in which the blue subpixel is twice as large as the red and green ones - which achieved 267 PPI. Obviously the new 4.99" Full-HD displays have a much higher PPI (440). I assumed Samsung will use the same PenTile arrangement used in most of their AMOLED displays.

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Samsung unveils the Galaxy S4, with a 5" Full-HD (441 PPI) Super AMOLED display

March 15, 2013, 12:58 am
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Samsung unveiled their new flagship smartphone, the Galaxy S4. As expected, it sports a 4.99" Full-HD (1920x1080, 441 PPI) Super AMOLED display behind a Corning Gorilla Glass 3. This phone will launch towards the end of April worldwide (on 327 carriers in 155 countries). The S4 seems to be more of an upgrade to the S3 than a revolutionary new handset.

According to previous reports, Samsung Display started producing these 5" Full-HD AMOLED panels in February at a rate of 3 million units per moth (this will grow to almost 10 million monthly units in coming months). The S3 is Samsung's best selling and fastest selling smartphone, and obviously the company hopes that the S4 will sell even better.

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