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The first famous OLED Smartphone was the Google Nexus One, launched in January 2010, which included a Samsung early generation OLED display. But by far the most successful series of OLED Smartphones has been Samsung’s own Galaxy S series that launched in mid 2010 – Galaxy S I with a 4.0 inch screen in June 2010, Galaxy S II with a 4.5 inch screen in June 2011, and the just released Galaxy S III with a 4.8 inch screen in June 2012. All are called “Super AMOLED” – some are Plus and others are PenTile – we’ll explain the differences below.
Not surprisingly, all new display technologies initially start near the back of the pack in performance compared to the established and more refined products – IPS LCDs in this particular case. Not surprisingly, the Google Nexus One came in last place in our Smartphone Display Shoot-Out. But six months later the Samsung Galaxy S I did a lot better and we gave it a DisplayMate Best Video Hardware Award for the Best New Display Technology. In this Shoot-Out we will examine in-depth the display performance of the three Galaxy S generations to see how OLEDs have been evolving and improving over time. This article will be a combination of objective praise and critical analysis of OLED displays.
OLED versus LCD and LED
Most Smartphones, Tablets, Laptops, Computer Monitors, and HDTVs currently use LCD display technology, which is a transmissive technology that requires a Backlight to produce the light for the image. That Backlight is being made increasingly with LEDs. Many manufacturers advertise their LCD displays and HDTVs that have LED Backlights as LED displays and HDTVs, but that is very misleading because the LEDs are just the Backlight for the LCD. There are actually no consumer LED displays or HDTVs. On the other hand, OLED displays are emissive devices that don’t require a Backlight because every pixel and sub-pixel gives off its own colored light to produce the image. That lack of a Backlight and its optics means that OLEDs are a lot thinner than LCDs and is also the reason why OLEDs will eventually become a lot cheaper to manufacture than LCDs.
OLED, PenTile AMOLED, Super AMOLED, Super AMOLED Plus, and HD Super AMOLED
The marketing terminology and puffery for displays varies among manufacturers and is confusing… The Google Nexus One was listed as having an “AMOLED” display. The AM stands for Active Matrix, but that prefix is unnecessary because all current LCD and OLED Smartphones, Tablets, Laptops, and HDTVs use an Active Matrix. All subsequent generations of Samsung OLEDs are called “Super AMOLED” in the same way that you’ll often see “Super LCD” advertised as well. Not all manufacturers use the “Super” terminology so it’s best just to ignore it as advertising puffery. “HD AMOLED” means that the pixel resolution of the display is High Definition 1280 x 720 pixels or higher. But here is where it gets complicated and confusing – if you see “Plus” that means that the display has the traditional 3 Red, Green and Blue sub-pixel arrangement that is found in almost all display technologies. If you don’t see “Plus” on Samsung devices that means that the display has only 2 sub-pixels per pixel (a Minus) – half of the pixels have Green and Red sub-pixels and the other half have Green and Blue sub-pixels, so Red and Blue are always shared by two adjacent pixels. This technology is called “PenTile.” PenTile screens have only half the total number of Red and Blue sub-pixels as the traditional 3 sub-pixel displays, so they aren’t as sharp as traditional displays with the same pixel resolution and their highly advertised screen PPIs are not comparable. This is especially noticeable with colored text and graphics. PenTile uses Sub-pixel Rendering and Anti-Aliasing that partially compensates for this shortfall. PenTile displays have some advantages: they are easier to manufacture and therefore cost less, and for OLEDs the Red, Green and Blue sub-pixels are sized differently and that improves Blue aging somewhat (see below). For now, OLED displays over 250 PPI use PenTile technology. It’s expected that the next generation of OLEDs will be called “HD Super AMOLED Plus” and they will have the standard 3 sub-pixels per pixel.
The Shoot-Out
To compare the performance of the Galaxy S series of OLEDs we ran our in-depth series of Display Technology Shoot-Out tests on the Galaxy S I, Galaxy S II, and Galaxy S III. We take display quality very seriously and provide in-depth objective analysis side-by-side comparisons based on detailed laboratory measurements and extensive viewing tests with both test patterns and test images. For additional background, context, and comparisons see our in-depth new iPad Display Shoot-Out and the previous generation Smartphone
Results Highlights
In this Results section we provide Highlights of the comprehensive lab measurements and extensive side-by-side visual comparisons using test photos, test images and test patterns that are presented in later sections. The next section below provides OLED Power Saving and Aging Advice. The Comparison Table in the following section summarizes the lab measurements in the following categories: Screen Reflections, Brightness and Contrast, Colors and Intensities, Viewing Angles, Display Power Consumption, Running Time on Battery.
New Issues for a New Technology: OLED is a very different new display technology and so both manufacturers and consumers will have to learn about its particular performance requirements and idiosyncrasies. The new issues for OLEDS are just as challenging and significant as when we shifted from CRTs to LCDs. An excellent source of information about OLEDS is www.oled-info.com. As the discussion below shows, manufacturers still have a lot to learn…
OLED Engineering versus Galaxy Marketing: This is actually a combined Shoot-Out – we are looking at an OLED display implemented within Samsung Galaxy Marketing goals and requirements. One of the most important is to make the Smartphone as thin and light as possible. Unfortunately, the battery is a major contributor to both thickness and weight so it bears the brunt of this limitation. OLED displays still require more power on the average than comparable LCDs. And unfortunately, the Galaxy S I,II,III battery runtimes (below) are shorter than most other Smartphones that we have tested. As a result, Power Management is the single biggest issue confronting OLED displays. The power constraints on all of the Galaxy S Smartphones have significantly impacted many display performance issues, particularly on the Galaxy S III. This is undoubtedly a strategic marketing decision, but it would be nice if the Galaxy S III were also available in a slightly thicker and heavier version with a bigger battery. In particular, that would help its OLED display really shine if there were fewer imposed power constraints that affect its calibration and performance…
OLED Progress Report: Based on our Lab tests and measurements below there has been a rapid and significant improvement in OLED performance within the Galaxy S I,II,III series, particularly the power efficiency, which is extremely important. The OLED displays themselves are excellent, but their overall performance has been compromised by the calibration and implementation choices that have been made for the Galaxy S series, which are discussed in detail throughout this article.
OLED Aging: All display technologies age to varying degrees. The current generation of Blue OLEDs age much faster than the Red and Green OLEDs. The current 50 percent aging Brightness for Blue is specified by the manufacturers at 20,000 hours while Red and Green are both over 200,000 hours. People generally don’t hold onto their Smartphones for very long: for example, 2 years at 4 hours per day is about 3,000 hours. That would actually be enough time for the Blue aging to become visually noticeable, but there is also some built-in automatic aging compensation that adjusts the drive levels to help counteract the aging effects. In the past users have documented OLED aging with screen shots, but there have been continuing improvements, so it’s hard to say how large the visual aging effects are for the current generation of OLEDs. We include some advice on reducing aging effects and improving the power efficiency of OLEDs below.
Comparison with the Best LCDs: The premium IPS LCDs used in many top performing Smartphones and Tablets (including the iPhone 4s and iPads) are the benchmark competition for these OLED displays. IPS LCDs remain significantly brighter and still have a higher overall power efficiency, but typically have a smaller Color Gamut, a higher Black Level, a larger Brightness decrease with Viewing Angle, and some Motion Blur. OLEDs are still more expensive than LCDs, although that will change over the next several years. While LCDs are not very power efficient, they are still more power efficient than OLEDs for producing bright images (although the public perception is the reverse – that’s why OLED displays are dimmer and why you don’t see any large OLED Tablets). There has been quite a significant improvement within the Galaxy S I,II,III series and this will undoubtedly continue until OLEDs eventually become more efficient than LCDs. For comparison with LCDs see our in-depth new iPad Display Shoot-Out.
Screen Brightness: The Maximum and Peak Brightness for the Galaxy S III are significantly lower than the S II and S I, and they are in turn lower than most LCDs. Fortunately, the Screen Reflectance of the Galaxy S series is among the lowest we have ever measured and that helps overcome much of the Brightness shortfall. A more troubling issue with current OLEDs is the variation in Brightness that occurs with image content, called the Average Picture Level, APL. Bright images with high APL have their screen Brightness reduced by up to 30 percent, which introduces undesirable Brightness variations with content. Another side effect is that the Brightness of images can change significantly in shifting between Portrait and Landscape modes. On the Google Galaxy Nexus, a close cousin of the Galaxy S III, the effect is so large for high APL that the Brightness (Luminance) of Green is greater than White, which is very wrong.
Color of White for OLEDs: Providing an accurate White is very important for getting accurate colors in images, particularly photos and videos. The Standard White for digital photography and essentially all consumer content is called D6500, which is the color of Daylight and corresponds to a Color Temperature of 6,500 degrees Kelvin. Whites with a higher Color Temperature appear too blue and lower too yellow. White for the Galaxy S series ranges from 10,200 Kelvin for the S I down to 7,900 Kelvin for the S III, among the bluest Whites we have ever measured. This gives all images something of a cold bluish cast. But what is positively shocking about increasing the Blue content of all images is that Blue OLEDs have only about one tenth the power efficiency of Red and Green OLEDs (see below), so the additional Blue produces a significant waste of precious power that has very little effect on the total screen Brightness. Perhaps even more shocking is that the Blue OLEDs age at a much faster rate than the Red and Green OLEDs, so the higher Color Temperature accelerates the aging process – a very bad idea. Using the Standard D6500 White would improve color accuracy, improve battery run time, and reduce aging…
Color Saturation and Accuracy: OLEDs have a large native Color Gamut, much bigger than LCDs, but bigger isn’t always better. In order to accurately reproduce the colors in photos, videos and other images the display needs to match the Standard sRGB / Rec.709 Color Gamut that is used to generate most consumer content. The Color Gamut of the Galaxy S I,II,III is 138 percent of the Standard, which produces oversaturated colors that can appear comic book like and gaudy in some instances. Photos appear with way too much color. It’s similar to turning the Color Control way up on your HDTV. Unfortunately, none of the Galaxy S Smartphones have a similar Color Saturation control that would allow users to correct this or adjust it to their satisfaction, so you’re stuck unless there is a software update that corrects this. An accurate factory color calibration would fix it – but the exaggerated images sometimes make these Smartphones standout in a crowd, so it undoubtedly helps boost retail store sales. But eventually when you want to see accurate renderings of your photos and images, you’re out of luck. Note that Apple is emphasizing very high color accuracy in their latest displays – hopefully Samsung will follow the lead…
Irregular Color Gamut and Power Implications: Not only is the Galaxy S I,II,III Color Gamut set way too large, but it is also very irregular – Green is much more saturated compared with either Red or Blue, as shown in Figure 2. This imbalance has a tendency to give images a Green accent and color cast. But correcting the Gamut so that it matches the Standard has power efficiency implications because Green is significantly more power efficient than either Red or Blue, and they must be added as calibration color mixtures for the Color Gamut adjustments, so the power consumption for a calibrated OLED display will be higher. See below.
Viewing Angle Performance: In principle, OLEDs shouldn’t have any variation in Brightness or Color with Viewing Angle. But they do – they are still better than LCDs but show significantly larger Brightness and Color Shifts than might be expected. The Color Shifts are actually about double that for IPS LCDs, but are still satisfactory. This is due primarily to the anti-reflection layer, although the touch screen and cover glass also affect Viewing Angle performance. The root cause is the greater optical path absorption at larger Viewing Angles. It’s still satisfactory, but larger than expected. However, at very large Viewing Angles (greater than 45 degrees) the screens on the Galaxy S I,II,III take on a distinctly strong blue color shift and cast.
OLED Power Efficiency: While LCDs are not very power efficient, they are still currently more power efficient than OLEDs for producing bright high Average Picture Level APL images. For dark low APL images OLEDs are very efficient and LCDs very inefficient. So OLED Power Efficiency and Power Management strategies become very important for bright images because they are using lots of battery power (and generating heat). By far the most significant issue is that Green OLEDs are 12 times more power efficient than Blue OLEDs and 1.8 times more efficient than Red OLEDs at producing visible light (Luminance) for a given amount of display power (Watts). In fact, Blue OLEDs consume more power than Green OLEDs but generate only 9 percent of Green OLED Brightness (Luminance). This tremendous imbalance means that images with lots of Green content are much more power efficient. It also means that color mixtures all come with an power penalty. In fact, color calibration of an OLED display so that it matches the sRGB / Rec.709 Standard would require complex color mixtures that will have noticeably higher power demands, which may make OLED calibration challenging in the near future for mobile displays until the OLED efficiencies (or battery power) increase significantly.
Galaxy S I, Galaxy S II, and Galaxy S III Power Efficiency Comparisons: From our Luminance, Power, and screen Area measurements we can compare the relative display power efficiencies of the three Galaxy S generations. In going from the S I to the S II there was a 29 percent improvement in display power efficiency, and in going from the S II to the S III there was a 43 percent improvement in display power efficiency. From S I to S III there was a total of 59 percent improvement in display power efficiency – that’s in just 2 years – very impressive!
OLED Galaxy S III and iPhone LCD Power Efficiency Comparisons: Typical full screen text applications (on a white background) have an Average Picture Level APL of 90 percent or more, so we expect LCDs to do better. On the other hand, typical full screen video and photographic images have an APL of 20 percent or less, so we expect OLEDs to do better there. From our Luminance, Power, and screen Area measurements we can determine exactly who is better, when, and by how much. Comparing the Galaxy S III and the iPhone 4, images with less than 28 percent APL are more power efficient on the Galaxy S III, and greater than 28 percent are more efficient on the iPhone 4 – so the Galaxy S III is somewhat more efficient for videos and significantly less efficient for text applications. But the iPhone 4 uses an LCD with Low Temperature Poly Silicon that is significantly more efficient than typical LCDs with amorphous Silicon, such as the iPhone 3GS – where the crossover is a lot higher at 69 percent APL, so it’s a split decision there depending on the application mix…
Aggressive Power Management: The smaller battery and bigger power needs of the larger OLED screens requires aggressive display power management. The Galaxy S I has the least Power Management and the Galaxy S III has the most. First of all, the Maximum and Peak Brightness for the Galaxy S III are set significantly lower than the S II and S I, and they are in turn lower than most LCDs. Fortunately, the Screen Reflectance of the Galaxy S series is among the lowest we have ever measured and that helps overcome much of the Brightness shortfall. Also to save power, images with a high Average Picture Level APL are automatically dimmed by up to 30 percent. An Automatic Brightness control based on the Ambient Light level is also important for display power management, but it is implemented poorly (see below). These issues combined with the Power Efficiency effects discussed above could all be better implemented with a Display Power Management Slider – set it low and the display receives aggressive power management – set it high and the display delivers optimum performance.
Significantly Improved Battery Running Times: The large improvement in OLED power efficiency and the much more aggressive Power Management has produced a 75 percent increase in Battery Running Time for the Galaxy S I to II to III, from a poor 3.2 hours to a very good 5.6 hours. For comparison, note that the iPhone 4 has a running time of 7.8 hours with a screen Brightness of 541 cd/m2 while the Galaxy S III has a running time of 5.6 hours with a screen Brightness of 224 cd/m2. The running times are based on a full brightness all white screen with no running applications. As the Average Picture Level APL decreases the Battery Running Times for OLEDs will increase.
Screen Reflectance: Ambient light reflecting off the screen washes out the image, its contrast and colors. Increasing the screen brightness is one way to overcome this problem but it uses precious battery power (and speeds up the OLED aging process). A much better method is to lower the screen Reflectance. Because of the way the LCD optics works they already have some built-in anti-reflection – not so for OLEDs, so they have a much more difficult Reflectance problem. Fortunately, Samsung has risen to the challenge because the Galaxy S OLED displays all have Reflectance of 5 percent or less – among the lowest we have ever measured. The Nokia Lumina 900 is the only other Smartphone to come in under 5 percent Reflectance. This is quite impressive – it’s done by using advanced optics, a Quarter Wave Plate under the cover glass suppresses the reflections. This is super important for OLEDs because of the brightness, power, and aging issues discussed above. Samsung has done an excellent job here. However, the Lab measurements indicate that the Reflectance is getting slightly worse from I to II to III, rather than better…
Automatic Brightness: It is particularly important for Smartphones to accurately and automatically adjust their screen brightness according to the current highly variable Ambient Lighting conditions. This maintains screen visibility while minimizing the battery power needed to do so. Because OLEDs have significant power management issues this is especially important for them. Unfortunately, the Galaxy S Smartphones all perform poorly here (as do almost all Android devices – Apple does slightly better but still poorly). The Galaxy S I,II,III results are similar to the results in our Automatic Brightness Shoot-Out. An innovative application for the OLED’s large native Color Gamut and high Color Saturation is to (only) fully use it when there is High Ambient Light, which will help compensate for the washed out image colors and will even allow lower screen Brightness to be used under those conditions – but before that happens Automatic Brightness and Color Calibration will need to be properly implemented.
Polarized Sunglasses: Most LCDs and some OLED displays can have screen viewing interference problems with polarized sunglasses – the image can become invisible Black at some screen orientations and angles. The Galaxy S I, Galaxy S II, and Galaxy Nexus have Quarter Wave Plate optics that result in a screen extinction at a 45 degree orientation, so their screens can be read in both Landscape and Portrait orientations, which is good. However, the Galaxy S III screen shows multi-colored circular rings with polarized sunglasses, which are quite pronounced at large Viewing Angles, so the Galaxy S III is not good with polarized sunglasses.
Google Galaxy Nexus: The Google Galaxy Nexus is also made by Samsung and has an OLED display that is very similar to the Galaxy S III. However, its Brightness is set much higher than the S III, but it then has a much higher variation in Brightness with the APL of image content as discussed above – it is more than a 2:1 variation, which is way too large. In fact, the effect on the Galaxy Nexus is so large that for high APL the Brightness (Luminance) of Green is greater than White, which is very wrong. Hopefully, Google will correct that with an Android software update…
OLED Power Saving and Aging Advice
There is a lot that individual users can do to reduce the power consumption of OLEDs and also reduce potential aging effects:
The obvious recommendation for all display technologies is to appropriately adjust the screen Brightness for the current level of Ambient Light – that should be done by the Automatic Brightness control, but as indicated above it is poorly implemented and close to useless on virtually all Smartphones including the Galaxy S series. Hopefully that will be corrected in future versions of Android. When adjusting screen Brightness also take into account that applications like reading require higher visual acuity and need more Brightness than when looking at photo and video content.
Unlike LCDs, display power on OLEDs depends entirely on the image content – brighter images use more power. In particular, wallpapers and screen backgrounds can have a considerable impact on OLED power consumption.
Because of differential aging, setting your wallpaper to all Black is most likely a bad idea because the fixed arrangement of Home Screen icons may eventually affect screen uniformity, so ghost images of the icons might become noticeable.
For all text based reading applications it is a really good idea to set the standard Black text on a White background to Reverse Video, White text on a Black background. Not only does that use a lot less power but it improves screen viewability in bright Ambient Lighting. Start by setting Google’s search page to a Black background. Do the same for Email and other Apps and websites wherever possible.
Setting your wallpaper to a bright beach scene will use a lot more power than a subdued indoor photo. A more subtle but more important issue is that color has a major impact on display power consumption because the Green OLEDs provide 10 times more Brightness per watt than Blue OLEDs. In fact, Blue OLEDs consume more power than Green OLEDs but deliver only about one tenth of the Brightness. So give preference to images and wallpapers with Greens and try to avoid images with lots of Blue.
Conclusion: Great OLED Displays… But Compromised by Galaxy Marketing Constraints…
All of the Galaxy S OLEDs performed very well in our Lab Tests and Measurements. The results indicate that there has been a rapid and significant 2:1 improvement in OLED performance, particularly the power efficiency within the Galaxy S I,II,III series in just 2 years, which is very impressive. LCDs like the iPhone 4 are still considerably more power efficient than the latest OLEDs for bright image content with white backgrounds, which includes most text based and web applications. On the other hand, OLEDs are much more power efficient for full screen videos and photos, which generally have low Average Picture Levels.
The OLED displays themselves are excellent, but their overall performance has been compromised by the implementation choices that have been made in marketing the Galaxy S series. In particular, the power constraints have significantly compromised many display performance issues, particularly in the Galaxy S III, in order to deliver a very thin and light phone with very good battery running times. This is undoubtedly a strategic marketing decision, but it would be nice if the Galaxy S III were also available in a slightly thicker and heavier version with a bigger battery. That would help its OLED display really shine, particularly if there were fewer imposed power constraints that affect its display performance. In addition, OLED displays all currently suffer from a lack of accurate Color Calibration, something that LCDs have gotten very good at, particularly the new iPad, which is almost accurate enough to be used as a professional studio reference monitor, so its photos, videos, and image content appear beautiful and accurate. Hopefully, the same will happen for OLED displays in the near future…
Even with these compromises and performance issues the latest Galaxy S III has an impressive OLED display. If and when Samsung and Google implement the suggestions that we have made it will turn into an outstanding display. That and future models indicate a very promising and exciting future for OLEDs…
Lots of Room for Improvement by Samsung and all of the other OLED Smartphone and Tablet Manufacturers:
While Samsung has zeroed in on OLED power efficiency and done an excellent job of it, there are still plenty of other very important display issues that need to be addressed by all of the OLED Smartphone and Tablet manufacturers. Here are just a few: 1. Variable Display Power Management: The Power Efficiency effects discussed above could all be better implemented with a Display Power Management Slider – set it low and the display receives aggressive power management – set it high and the display delivers optimum performance. 2. Accurate Color Calibration: The OLED Color Gamut is not only substantially larger than the sRGB/ Rec.709 Standard, but it is also very irregular – Green is much more saturated compared with either Red or Blue, as shown in Figure 2. This imbalance has a tendency to give images a Green accent and color cast. The display also needs a Standard D6500 White Point – using D6500 would improve color accuracy, improve Battery Running Time, and reduce Blue aging. Note that Apple is emphasizing very high color accuracy in their latest displays – hopefully Samsung and other manufacturers will follow the lead. 3. Screen Reflectance: Samsung has done an excellent job here, but the Lab measurements indicate that the Reflectance is getting slightly worse from Galaxy S I to II to III – it definitely needs to get better. The typically large screen reflections can make the screen much harder to read even in moderate ambient light levels, requiring ever higher brightness settings that waste precious battery power. Manufacturers need to significantly reduce the mirror reflections with anti-reflection coatings and haze surface finishes. This article shows how Smartphone and Tablet screens degrade as the Ambient Light increases from 0 to 40,000 lux. 4. Ambient Light Sensor: The forward facing Ambient Light Sensor on virtually all Smartphones and Tablets measures the brightness of your face instead of the surrounding Ambient Light, which is what is needed to accurately set the screen’s Automatic Brightness. 5. Automatic Brightness: The Automatic Brightness controls on all Smartphones and Tablets that we have measured are positively awful and close to functionally useless. As a result they often get turned off, which reduces battery run time and increases eye strain. This article explains how to do it properly. 6. Display User Interface: The User Interface for most Smartphone and Tablet displays consists of a Brightness slider and an Automatic Brightness checkbox. People have very different visual preferences that should be accommodated with a display Pizzazz control that is similar to the functionality provided by the audio Equalizers found on most Smartphones and Tablets.
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SOURCE: DISPLAYMATE
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tritran18518 said:
I take no credit to post this information. They all belong to displaymate.com website
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Thanks for sharing. So green beats black? Or is it black > green > blue
Sent from my HTC VLE_U using xda premium
ickedmel said:
Thanks for sharing. So green beats black? Or is it black > green > blue
Sent from my HTC VLE_U using xda premium
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Green >Red> Blue. Amoled screen will save most of power when it display black, but at the same time, if you set black walpaper for your phone, it will reduces your screen's age.
P/S: Now i know why Iphones have very good battery life.
Written by an Apple fanboy by the look of it. Still, decent article.
djsubtronic said:
Written by an Apple fanboy by the look of it. Still, decent article.
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Agreed. Good article still. Always like new information I didn't know before.
Thanks for sharing the article, Tritran.
Galaxy S II had a 4.3" display, not 4.5", otherwise not a bad article.
EDIT: the picture of an SII in the article isn't the standard Galaxy S II but one of the other variants, perhaps that's why.
The One S has much better OLED display because HTC actually properly calibrated it for about 6500k white point and the color gamut is much more accurate. Only issue is auto brightness, but that is easily fixed with custom auto brightness values.
Sent from my Inspire 4G using xda app-developers app
Excellent.
Thanks a lot :good:
What would be exactly the codes (they are not hexadecimal, I think) for green, blue and red colours in the phone?
Would be wise to use some green screen filter?
https://play.google.com/store/apps/details?id=com.kovit.p.filteryourscreen
Awesome info!
very interesting!
thx for sharing!
Try an app called "screen adjuster" and set the blue to plus 3 or however you like. I think it looks pretty good
Sent from my HTC One S using xda app-developers app
I call tl;dr, so I'll shorten it a little bit (although I haven't read it, I'll use my knowledge of it)
AMOLED screens almost always have better battery life than standard TFT LCD screens. This is because the majority of them use Samsung's PenTile technology, which uses two colours per pixel instead of three. Like our phone, it has RG BG RG BG layout. This means that the resolution that the manufacturer claims the phone has is not always accurate
However, AMOLED+ screens have RGB RGB layout, meaning the phone has a true resolution. The downside of this is worse battery life.
AMOLED screens will ALWAYS have better contrast than TFT LCD screens. This is because when a pixel is meant to be black, it turns itself off, meaning it gives out zero light. Also, because each pixel has local dimming, it often gives out much more light than TFT LCD screens.
AMOLED screens also give better saturation of colours compared to TFT LCD screens. The best example of this is green. Get a plain green screen on a One X and a plain green screen on a One S, put the phones next to each-other and you will see the One S has a far richer green. Repeat it with all colours and the differences will be far less exaggerated, but the AMOLED screen will still be richer.
So, what's the downside? Screen burn. LCD screens are rather resistant to screen burn, while LED screens are as vulnerable as CRT screens (for people who don't know what CRT screens are, remember the televisions that had massive boxes on the back?). So, objects that are almost always on your screen, like the notification bar and the header bar, will usually get burned onto the screen.
Second downside, the phone will usually cost more than it would with a TFT LCD screen. This is because they cosy more to manufacture.
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Still tl;dr but not as long.
Sent from my HTC One S using xda premium
http://reviews.cnet.com/8301-6452_7-57587774/screens-test-htc-one-vs-samsung-galaxy-s4/
They compare the LCD technology and the AMOLED technology from the HTC One and the Samsung Galaxy S4 respectively. They determined that color accuracy, image detail, contrast and blacks to be superior in the Galaxy flagship, while giving brightness and outdoor legibility in direct light to its competitor. The iPhone 5 is considered best in class for handheld mobile LCD technology when it comes to color reproduction, due to better screen calibration on a smaller panel.
This comparison finding is further supported by the reputable business "DisplayMate" conducting comparison tests on the iPhone 5 and Galaxy S4 only to determine that they're on par.
megagodx said:
http://reviews.cnet.com/8301-6452_7-57587774/screens-test-htc-one-vs-samsung-galaxy-s4/
They compare the LCD technology and the AMOLED technology from the HTC One and the Samsung Galaxy S4 respectively. They determined that color accuracy, image detail, contrast and blacks to be superior in the Galaxy flagship, while giving brightness and outdoor legibility in direct light to its competitor. The iPhone 5 is considered best in class for handheld mobile LCD technology when it comes to color reproduction, due to better screen calibration on a smaller panel.
This comparison finding is further supported by the reputable business "DisplayMate" conducting comparison tests on the iPhone 5 and Galaxy S4 only to determine that they're on par.
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"When you deselect the Adapt Display check box you can select from Dynamic, Standard, Professional Photo, or Movie. We measured them all, and Movie delivered the most accurate color. Its saturation error in particular is much lower than that of the other modes. Movie mode's advantage over the others isn't as strong as it was on the Note 2, however."
Movie is the best mode? Movie mode looks washed out, poor and boring close to Dynamic or Adapt Display.
I don't give a damn about synthetic color accuracy. That only makes sense if you are a professional that works with imaging and you NEED color accuracy. I don't care about that, since I don't work with that. I'm just a regular user that wants to enjoy my cell phone and I want rich, vivid images with images exploding with exaggerated color, because that's what makes me feel like having a great screen, and that´s what people tell me when they see my screen and say "wow, look at those colors".
I always thought that Galaxy S screens look much better then iPhone screens, and one of the reasons for that is the natural color boosting AMOLED screens do. Sure, they are not "accurate", but they look great. Accurate = boring. Vivid colors = awesome.
Yea. I switched to Movie Mode on my N2 and it looked horrible and faded.
Sent from my SPH-L900 using xda app-developers app
I much prefer saturated/richer colors, but I did wonder about color accuracy since reading other blogs/reviews/posts people have said the S4 is much less accurate than the HTC One/iPhone with regards to accuracy. I guess this sort of counterpoints those claims.
I am glad that we can chose what we want so... that's really good.
There is mode for everyone and it's great to be able to chose and have more options.
The point is. We all know OLED is not as color accurate as LCD. OLED boosts rich vivid colors that, although unaccurate, look awesome. Not to mention the perfect dark pitch and virtually infinite contrast ratio (unlike color accuracy, elevated contrast ratio is equally impressive both in theory and in practice).
Buying a OLED phone and trying to make it look like an LCD phone makes no sense to me. If I want a LCD-looking screen with LCD color accuracy, I´ll just buy an LCD phone.
^ Are you buying a phone based on the screen?
Point is that Amoled can be great on it's own but also can be good where LCDs are better and improve from generation to generation.
Suchomimus said:
I much prefer saturated/richer colors, but I did wonder about color accuracy since reading other blogs/reviews/posts people have said the S4 is much less accurate than the HTC One/iPhone with regards to accuracy. I guess this sort of counterpoints those claims.
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Blogs, pundits of tech sites and such aren't usually knowledgeable when it comes to all factors of determining a good display. I find that they more often than not base their knowledge off of general propaganda. Or they don't have the right type of technology to conduct an invasive and accurate test for gauging the quality of a display in comparison to another.
All the information supplemented in the OP comes from sources that work in the business as screen calibrate technicians; DisplayMate (http://displaymate.com/Galaxy_S4_ShootOut_1.htm) is among the most reputable you'll ever find when it comes to screen assessment, as they do calibration for a living and have the technology to properly asses. I'd rather take their word than some editorial pundit from PocketNow or Gizmodo.
I think they all have their pro's and con's, I suggest you choose what looks good with your eye's and not base on test results or peoples opinions.
richardbroder said:
The point is. We all know OLED is not as color accurate as LCD.
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OLEDs are perfectly capable to display absolute accurate colours and go beyond any other display technology in terms of output.
The problem is Samsung's presets accuracy and lack of education.
Sadly because the US variant of the S2 and S3 lacked the hardware for the display modes, that AMOLED got this asinine reputation.
http://www.phonearena.com/news/UL-certifies-the-4.99-FHD-display-on-the-Samsung-Galaxy-S4_id43874
According to UL, the screen on the Samsung Galaxy S4 offers one of the best color reproductions in the mobile industry with the broadest color gamut of up to 97% for the Adobe RGB color space. The screen is said to have one of the best contrast ratios and can be better seen under bright sunlight than the display on many of the phone's rivals.
*Emix* said:
http://www.phonearena.com/news/UL-certifies-the-4.99-FHD-display-on-the-Samsung-Galaxy-S4_id43874
According to UL, the screen on the Samsung Galaxy S4 offers one of the best color reproductions in the mobile industry with the broadest color gamut of up to 97% for the Adobe RGB color space. The screen is said to have one of the best contrast ratios and can be better seen under bright sunlight than the display on many of the phone's rivals.
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I was thinking about linking that, too. AMOLED truly does seem like it's going to be the future for top-end displays. They really just have to improve energy efficiency with the panel, so it can push higher degrees of brightness, that should dethrone any practical advantageous aspect to an LCD. The panel from S III to S4 was a major leap forward in enhancement. Makes me eagerly curious to see what the Note III and moreover, the S5 will shape this technology into next.
I use Movie mode and find it the best for me beacause im not a big fan of saturated colors.
They just need to sort motion blur and burn in before they can get back to the top.
That article is all well and good, but doesn't take into account that side by side with a HTC One, the S4 screen is underwhelming in real world.
I have gone with Samsung since S2 as I loved that device to bits, but the screen on the S4 blew me away for all the wrong reasons, hence why I bought the HTC One.
Had to chime in as I love samsung phones, but feel they dropped the ball with this one. The S4 screen for me is not even as nice as the S3. I don't know why, maybe by trying to mimic LCD, they lost what was good about AMOLED in the first place. The "pop".
Highlights...
A new 3K Higher Resolution 2960 x 1440 display that fills almost the entire front face of the phone from edge-to-edge, resulting in a larger 5.8 inch display with a taller height to width Aspect Ratio of 18.5 : 9 = 2.05.
A new and accurate full 100% DCI-P3 Color Gamut that is also used for 4K TVs. Plus it is the first Smartphone to be certified by the UHD Alliance for Mobile HDR Premium, which allows it to play all of the latest content produced for 4K UHD Premium TVs.
The Native Color Gamut of the Galaxy S8 is even larger, the result of its new high saturation “Deep Red” OLED, resulting in a very impressive 113% of DCI-P3 and 142% of sRGB / Rec.709 Gamuts that also produces better on-screen Colors in High Ambient Light.
The Galaxy S8 has 5% to 19% Higher Screen Brightness, plus a record Peak Brightness of over 1,000 nits.
New front and back Dual Ambient Light Sensors for significantly improved Automatic Brightness settings.
Since 2013 the Display Power Efficiency of the Galaxy series of Smartphones has improved by a very impressive 56%. This year the new OLED materials on the Galaxy S8 have improved optical and power efficiency with its larger Native Color Gamut than on the Galaxy S7 (142% compared to 131% for sRGB / Rec.709).
Here's the link to the test....
http://displaymate.com/Galaxy_S8_ShootOut_01.htm
Love it, hopefully the battery will last long enough then!
Thanks for this, I didn't think they would have this review up already so I didn't check. That sounds fantastic, pretty much the most important aspect of a phone. It's what we look at and interactive with all the time. It will complement my HDR TV nicely, I can watch HDR Netflix etc on the go now. Great news. Now I'm waiting for the Dxomark camera review.
Wonder how this compares to the note 7? I still have mine. Preordered the black s8 plus also
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Sammy really should make an OLED TV with this screen, even though their QLED TV's are really good right now.
J-Hop2o6 said:
Sammy really should make an OLED TV with this screen, even though their QLED TV's are really good right now.
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Their QLEDs suck compared to OLED unless viewing HDR content mastered at 4000 nits, and even then, you are trading contrast for brightness and still dealing with poor viewing angles.
They tried OLED TVs and failed. They either couldn't make good yields or product life span with their RGB pixels and cut OLED TVs. LG uses patented white OLED pixels with RGB color filters which results in uniform pixel/panel wear and they have managed great yields on the panels. They are the sole manufacturer of all OLED TV panels today.