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Smartphone display acronyms can be a little overwhelming, but if you want to know what all the numbers and abbreviations associated with smartphone screens mean, we've got you covered. Want to know what each screen type is best for and what the differences in screen resolution mean? PANEL TYPES In recent years, smartphone displays have developed far more acronyms than ever before with each different one featuring a different kind of technology. AMOLED, LCD, LED, IPS, TFT, PLS, LTPS, LTPO...the list continues to grow. As if the different available technologies weren't enough, component and smartphone manufacturers adopt more and more glorified names like "Super Retina XDR" and "Dynamic AMOLED", which ends up increasing the potential for confusion among consumers. So let's take a look at some of these terms used in smartphone specification sheets and decipher them. There are many display types used in smartphones: LCD, OLED, AMOLED, Super AMOLED, TFT, IPS and a few others that are less frequently found on smartphones nowadays, like TFT-LCD. One of the most frequently found on mid-to-high range phones now is IPS-LCD. But what do these all mean? In short, there are two kinds of technologies available in the market for smartphone displays: LCD and OLED. Each of them has several variations and generations, which gives rise to more acronyms, similar to televisions and their different ranges such as LED, QLED, miniLED - which are all actually variations of LCD technology. What is an LCD display? LCD means Liquid Crystal Display, and its name refers to the array of liquid crystals illuminated by a backlight, and their ubiquity and relatively low-cost makes them a popular choice for smartphones and many other devices. LCDs also tend to perform quite well in direct sunlight, as the entire display is illuminated from behind, but does suffer from potentially less accurate colour representation than displays that don't require a backlight. Within smartphones, you have both TFT and IPS displays. TFT stands for Thin Film Transistor, an advanced version of LCD that uses an active matrix (like the AM in AMOLED). Active matrix means that each pixel is attached to a transistor and capacitor individually. The main advantage of TFT is its relatively low production cost and increased contrast when compared to traditional LCDs. The disadvantage of TFT LCDs is higher energy demands than some other LCDs, less impressive viewing angles and colour reproduction. It's for these reasons, and falling costs of alternative options, that TFTs are not commonly used in smartphones anymore. IPS displays IPS technology (In-Plane Switching) solves the problem that first generation of LCD displays experience, which adopt the TN (Twisted Nematic) technique: where colour distortion occurs when you view the display from the side - an effect that continues to crop up on cheaper smartphones and tablets. In IPS panels, the liquid crystals are aligned to the display, resulting in superior viewing angles - usually listed at 178º on TVs, which is another characteristic of IPS displays. Another characteristic of IPS displays in relation to other LCD technologies is superior colour reproduction, which explains the use of such panels in monitors that are meant for image editing jobs. PLS LCD displays The PLS (Plane to Line Switching) standard uses an acronym that is very similar to that of IPS, and is it any wonder that its basic operation is also similar in nature? The technology, developed by Samsung Display, has the same characteristics as IPS displays - good colour reproduction and viewing angles, but a lower contrast level compared to OLED and LCD/VA displays. According to Samsung Display, PLS panels have a lower production cost, higher brightness rates, and even superior viewing angles when compared to their rival, LG Display's IPS panels. Ultimately, whether a PLS or IPS panel is used, it boils down to the choice of the component supplier. Is the display LED or LCD? This is a very common question after "LED" TVs launched, with the short answer simply being LCD. The technology used in a LED display is liquid crystal, the difference being LEDs generating the backlight. LEDs have the advantage of consuming very little power - which explains the emphasis given by marketing departments in highlighting the term in TVs, but not so much when it comes to smartphones with their reduced display size. On the other hand, backlight operation makes it difficult for LCD/LED displays to offer a level of contrast that is competitive with OLED displays since the lighting control is not performed by each individual pixel, but by regions on the display. AMOLED displays AMOLED stands for Active Matrix Organic Light-Emitting Diode. While this may sound complicated it actually isn't. We already encountered the active matrix in TFT LCD technology, and OLED is simply a term for another thin-film display technology. OLED is an organic material that, like the name implies, emits light when a current is passed through it. As opposed to LCD panels, which are back-lit, OLED displays are 'always off' unless the individual pixels are electrified. This means that OLED displays have much purer blacks and consume less energy when black or darker colours are displayed on-screen. However, lighter-coloured themes on AMOLED screens use considerably more power than an LCD using the same theme. OLED screens are also more expensive to produce than LCD. Because the black pixels are 'off' in an OLED display, the contrast ratios are also higher compared to LCD screens. AMOLED displays have a very fast refresh rate too, but on the downside are not quite as visible in direct sunlight as backlit LCDs. Screen burn-in and diode degradation (because they are organic) are other factors to consider. On the positive side, AMOLED screens can be made thinner than LCDs (because they don't require a backlit layer) and they can also be made flexible. What's the difference between OLED, AMOLED and Super AMOLED? OLED stands for Organic Light Emitting Diode. An OLED display is comprised of thin sheets of electroluminescent material, the main benefit of which is they produce their own light, and so don't require a backlight, cutting down on energy requirements. OLED displays are more commonly referred to as AMOLED displays when used on smartphones or TVs. As we've already covered, the AM part of AMOLED stands for Active Matrix, which is different from a Passive Matrix OLED (P-OLED), though these are less common in smartphones. Super AMOLED is the name given by Samsung to its displays that used to only be found in high- end models but have now trickled down to more modestly specced devices. Like IPS LCDs, Super AMOLED improves upon the basic AMOLED premise by integrating the touch response layer into the display itself, rather than as an extra layer on top. As a result, Super AMOLED displays handle sunlight better than AMOLED displays and also require less power. As the name implies, Super AMOLED is simply a better version of AMOLED. It's not all just marketing bluster either: Samsung's displays are regularly reviewed as some of the best around. The latest evolution of the technology has been christened "Dynamic AMOLED". Samsung didn't go into detail about what the term means, but highlighted that panels with such identification include HDR10+ certification that supports a wider range of contrast and colours, as well as blue light reduction for improved visual comfort. In the same vein, the term "Fluid AMOLED" used by OnePlus on its most advanced devices basically highlights the high refresh rates employed, which results in more fluid animations on the screen. Foldable and rollable displays Another advantage of OLED displays is this: by doing away with an illumination layer, the component can not only be thinner but is also more flexible. This feature already sees action in smartphones with bendable displays and is also employed in conceptual devices with a rollable display.The technology debuted with the obscure Royole FlexPai, equipped with an OLED panel supplied by China's BOE, and was then used in the Huawei Mate X (pictured above) and the Motorola Razr (2019), where both also sport BOE's panel - and the Galaxy Flip and Fold lines, using the component supplied by Samsung Display. Retina, Super Retina XDR: what are they? Speaking of pixel density, this was one of Apple's highlights back in 2010 during the launch of the iPhone 4. The company christened the LCD screen (LED, TFT, and IPS) used in the smartphone as "Retina Display", thanks to the high resolution of the panel used (960 by 640 pixels back then) in its 3.5-inch display. The name coined by Apple's marketing department is applied to screens which, according to the company, the human eye is unable to discern the individual pixels from a normal viewing distance. In the case of iPhones, the term was applied to displays with a pixel density that is greater than 300 ppi (dots per inch). Since then, other manufacturers have followed suit, adopting panels with increasingly higher resolutions. While the iPhone 12 mini offers 476 dpi, while models like Sony Xperia 1 boast a whopping 643 dpi. To differentiate itself, Apple launched the term "Super Retina", which basically defines the OLED screens used on the iPhone X onwards, or the high contrast rates and colour accuracy that Galaxy S smartphone owners enjoy, and was even spotted in even some earlier Nokias.With the iPhone 11 Pro, another term was introduced to the equation: "Super Retina XDR". Still using an OLED panel (that is supplied by Samsung Display or LG Display), the smartphone brings even higher specs in terms of contrast - with a 2,000,000:1 ratio and brightness level of 1,200 nits, which have been specially optimized for displaying content in HDR format.

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