Learn more: Twenty useful terms you should know about tablets (tablet usage terms)

Learn more: Twenty useful terms you should know about tablets (tablet usage terms)

Learn more: Twenty useful terms you should know about tablets (tablet usage terms)

Nowadays, we find smart and portable gadgets around us everywhere. They combine elegance, beauty and convenience of carrying with extensive features and answer a large part of our processing needs. In the meantime, tablets have a special place. This is because, on the one hand, they have inherited many features from smartphones, and on the other hand, they have overcome the major weakness of smartphones, which is their small screen. (if we ignore the fair seller and valid warranty!) First, the variety of manufacturing companies, and then various hardware and software features. This article tries to accompany the reader in a smarter purchase by taking a closer look at the specification category in tablets. Many topics are not related to tablets and can be used for mobile phones as well.

1- Image resolution and pixel density

Image resolution (Resolution) means the number of pixels arranged together in the length and width of the display. For example, iPad Air has a resolution of 1536 x 2048 pixels. This number does not mean the physical dimensions of the screen, and alone it will not be a suitable parameter to measure the quality of the image we see. Pixel density is what we need and it means the number of pixels per unit length (here inches) and is expressed in terms of pixels per inch (ppi) or dots per inch (dpi) (both units are the same and have the same meaning ). There are different opinions regarding the appropriate pixel density for portable devices. In fact, this issue largely depends on the dimensions of the screen and its distance from the user’s eyes. For example, the pixel density of iPhone 5S is 326 and Samsung Galaxy S4 and LG G2 are 441 and 424 pixels per inch, respectively. In general, the higher the pixel density, the clearer and sharper the text and images are.


Mostly tablets like laptops They use liquid crystal display (LCD) and TFT or thin-film transistor technology. TFT technology has an active-matrix feature, which means using one transistor per pixel. Compared to the old passive-matrix technology, where we saw the transistors only in the length and width of the display panel, by placing a separate transistor in each pixel, we see a lower response time and a higher contrast in the formed images. IPS displays are a special type of TFT family in which liquid crystal molecules are placed parallel to the surface of the panel (compared to the previous vertical state). This feature, along with the presence of two transistors per pixel, enables IPS displays to achieve wider viewing angles and more uniform colors.

Most of the high-end products of Samsung, such as the Galaxy S 5 or Galaxy Tab S tablets use a special technology called Super AMOLED for their displays. The word Super means that the touch-sensitive layer is built into the screen, and the word AMOLED or “Active Matrix Organic Light-Emitting Diode” refers to a small organic structure inside the pixels that emits light when electricity passes through it. Unlike LCDs, this feature eliminates the need for a light source in the background of AMOLED displays and brings lower energy consumption, higher contrast and viewing angles with more vivid colors.

Capacitive touch technology

Capacitive touch is the most common technology used in tablet displays. The performance of this technology is such that the electric field spreads on the surface of a conductive and transparent layer. Then, by establishing contact between the finger (electrical conductor) and this conductive layer, the electric field changes and the location of the contact is determined. Capacitive touch, compared to the previous technology of pressure touch, in which the place of contact was determined by applying pressure and making contact between the two layers, has the ability to detect multiple touches at the same time or multi-touch.

4- font; Passive and active

Some tablets are accompanied by a special pen. This pen, which is known as Stylus, is offered in two types, Passive and Active. The passive type is a conductive pen and the capacitive display does not distinguish between it and the finger. On the other hand, the active type has a battery and an electric circuit inside, which gives it two special features: pressure sensitivity and wiper. Capacitive display can detect the amount of pressure applied by the active stylus and show appropriate reactions such as drawing thicker lines in graphic programs. Similarly, the eraser is a feature that is placed at the end of some active models, like a real eraser, and it is enough for the user to drag the end of the pen on the design or text to erase everything.

5- str Phablet

Let’s say we’re a mobile device manufacturer and we want to make a smartphone that’s close to a tablet, but not so big that it’s a nightmare to carry around. If we combine the word “phone” with “tablet” to name this new product, the combination of “phablet” will be a possible result. Phablets have a screen between 5 and 7 inches, and while offering all the features of a smartphone, they benefit from the legacy of tablets, which is the large screen.


Tablets have a large screen that makes them pleasant to work with, especially when the user wants to watch his video and photo collection. Of course, this pleasure will not be as much when the screen is as big as an HDTV! This is where the micro-HDMI port comes in. A miniature port that provides a connection between a tablet and an HDTV with a simple cable. For this purpose and to communicate, it is necessary for the tablet to have a micro-HDMI port on it. Of course, in between, there are two other solutions called MHL (Mobile High-Definition Link) and SlimPort, which are common among some small tablets or smartphones due to their limited dimensions. By using one of these two functions, the tablet can be connected to the HDMI port of the TV with a special adapter and through the micro-USB port and transfer audio and video. In the meantime, fans of Apple products have another solution and must use a Lightning adapter or C-pin AV adapter to connect to the HDMI port.

7-  Miracast, AirPlay and WiDi

Today and compared to the past, cables play a smaller role in electronic communication, and with the passage of time, this role becomes even less. In today’s world, there is an array of wireless technologies that want to connect our portable devices to HDTVs. Technologies that compete with each other and often do not work together. Miracast is one of these technologies that has been able to fit into Android (version 4.2) and Windows Phone (version 8.1). Many famous manufacturers such as Samsung and LG support Miracast in their audio and video products. In the meantime, Intel has its own solution called WiDi. WiDi is compatible with Miracast and can be found in some Intel chipset-based tablets and laptops, as well as some high-end HDTVs, or even as a separate adapter. In the meantime, Apple uses its special AirPlay system and only serves its own products. Many audio devices such as portable speakers support AirPlay, but there is not much choice in the field of video, and if you plan to connect your iPhone or iPad to HDTV, Apple’s special hardware, AppleTV, will be the best choice.

8- eMMC

tablets have two types of storage space or memory on them; One is temporary memory or RAM, which usually has a volume between 1 and 3 GB and is used to run the operating system and applications, the other is permanent storage space with a volume between 4 and 128 GB, which is a place to store installed programs, music, photos, videos and others. User data and operating system are used. The most common format for the second type of memory is eMMC or Embedded MultiMedia Card, which is a special type of flash memory that is installed on the tablet’s motherboard. eMMCs are different from SSD drives that we see in some high-end systems and are slower, but they meet the needs of tablets.

9- microSD

Tablets have space They have limited dazzle and the main reason is their high price. As mentioned in the previous article, 128 GB is the most common size among today’s tablets, which, of course, is not a bad amount, but it is not very common. In this situation and if you need more storage volume, the only way to use external storage cards and of course the most common type is microSD. The microSD family has a great variety in speed and capacity, and in a similar way, tablets also support different capacities. Manufacturing companies always mention the maximum resolution supported by their product in its specifications, and the user can buy the right microSD card considering their needs and expectations.

App Store

App or application is a program that is installed and run on a mobile operating system such as Android or iOS. Some of these programs come with the tablet by default (native program) and others can be obtained from special online stores. These stores are called “App Store” and at least half of the pleasure of having a tablet is in installing and using applications from these stores, and of course, free samples are also found in large numbers. Apple product users have the Apple App Store for their operating system, while Android users use the Google Play Store.

11- iOS

Apple Corporation for Mobile products use a special operating system called iOS. The latest version of iOS at the time of writing is version 7.1 and version 8 is scheduled to be released in the fall of 2014. Operating systems have two main tasks: at the same time as they provide a suitable platform for installing and running applications, they provide a wide set of facilities and tools to the user. Apple does not charge for iOS updates and users can easily update their operating system by connecting their iPad or iPhone to Wi-Fi or by connecting to a PC or Mac with the help of the iTunes program. The only problem that remains in between is the lack of Apple support for some old products. For example, iOS version 7.1 is only compatible with the 3rd generation iPad (released in 2012) and later generations, and older iPads will have to go with their old version!

12-  Android (Android)

“Android” is Google’s operating system for portable devices such as tablets and phones. While Apple limited iOS to itself and its products, Android is an “open source” and free operating system, which means that any manufacturer can change it at will, install it on their products, and sell it. Of course, Google receives an amount as a usage right for some Android apps such as Google Maps and Google Play Store from the manufacturers. Android is regularly updated and Google’s routine is to put the name of a delicious food on its new and major update every time! Android KitKat (version 4.4 and the latest Android to date), Android Jelly Bean (version 4.1 to 4.3) or Popsicle (version 4.0) are some of the ones we have come across recently. The annoying thing about these updates is the long delay by the manufacturers in releasing them for their products. This issue goes so far that sometimes no updates are provided for them! As a result, there are many tablets (or phones) in the market, for which old versions of Android are the only choice. Of course, in the meantime, there is a special series called “Nexus” which is designed by Google and along with special editions of popular products of phone and tablet manufacturers (Play Store edition), they allow users to benefit from the pure and unaltered version of Android. In this way, users can install it on their device and enjoy the added features at the same time as the new update is released.

13- Windows RT

Microsoft Windows RT in Q 2011 to support ARM processors that dominated the market of portable devices (and of course they still are!). While one of Windows RT’s standout features is the bundled version of Microsoft Office, this software strength is also its weakness. The story is like a chicken and egg story. Many users do not move to Windows RT because many developers do not release their applications for it. On the flip side, many developers shy away from creating apps for Windows because users are few and far between! Regarding tablets, Microsoft has changed its strategy to a great extent for some time and has moved towards using Intel processors along with Windows 8.1 (such as the Surface Pro family).

14- System on Chip (SoC)

As we know, the brain of any processing system is its CPU or central processing unit. Many portable systems today, such as tablets and phones, use SOCs as central processing units. SoC is a type of chipset in which the processing cores along with the graphics processing unit, network controller and memory and some other parts are all placed on a piece of silicon. Such a solution allows manufacturers to provide cheaper tablets with lower energy consumption to eager users. In the latest generation of iPhone and iPad, Apple uses the powerful A7 SoC, while Android tablets are equipped with a wide range of chips from Qualcomm (Snapdragon family), Samsung (Exynos series), Nvidia (Tegra series) and MediaTek. has covered. Intel has opened its foot to the Android market with the latest series of Atom family processors.

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