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      "body": "Hello Steemians!!\nWelcome to this post about smartphone displays.This post will tell you how and what exactly happens underneath those dazzling displays that we all have in our smartphones.\n\nBefore I begin there is a particular term which will be used all throughout this post which is **'capacitance'**-.So what exactly is **'capacitance'**? \n**Capacitance is defined as the ability of anything to hold a “charge”.**\n**When we shuffle your feet across a carpet then touch a metal object and experience a static shock, that’s our body experiencing capacitance. Our body was acting as a capacitor, and storing the static electric energy picked up from the carpet.** \n\nNow lets get to the type of touchscreens which are most popular  \n-**Resistive.**\n-**Capacitive.**\n\n![resistive-touchscreen.png](https://steemitimages.com/DQmbhPaMyt8Ma3ghCKupkjf3XKkNzfwPM5XbxHXhrEYtiCS/resistive-touchscreen.png)\n**image-courtesy:www.makeuseof.com**\n\nThe above image shows how the resistive touchscreen works.\n\nA resistive touchscreen is made out of two thin layers separated by a thin gap. These are not the only layers in the resistive touchscreen, but we’ll focus on them for simplicity. \n\nWhen we touch or rather press the surface of a resistive touchscreen then the upper glass material bend due to the pressure of our fingers and touches the underlying layers and as a result of this touch a voltage is passed and a touch is registered.\nResistive touchscreens are not very popular for smartphone use anymore but they are still used in ATMS,car GPS screens.As in the initial smartphone days I have used quite a few resistive touchscreens and my observation was they are not very fluid to work with  and they require some amount of pressure to register a touch.\n\n-----------------------------------\n**Capacitive** touchscreens are what almost all the smartphone manufacturers use for their mobile devices .\n**Let me first tell you the screen you observe on  a smartphone is not just glass but a highly engineered material.**\nYou might have heard about **Corning's gorilla glass** which claims to be resistant to scratches. That is a chemically hardened material .\n\n![touch1-e1477423747988.png](https://steemitimages.com/DQmRaBFcUyC7pctjhEgzmseND6prRqMtWVfmT8Y11ch7KPV/touch1-e1477423747988.png)\n**image-courtesy:www.ubreakifix.com**\n\nIf you look at the image above you will get an idea of what the capacitive touchscreen comprises of.\nA capacitive touchscreen consists of conductive grid made up of horizontal conductors and vertical conductors (as shown in the figure).These are obviously transparent and does not obstruct our view of the display lying underneath.\n\nThe grid lines are etched on opposite sides of a thin plastic insulating sheet that is glued to the back of the glass lens.\nThese lines intersect each other and each form a tiny capacitors(ie.they can hold charges).Remember this is all happening at a very minute level and your smartphone screen consists of a million capacitors like this.\n\nThe grid is energized when the display is on, i.e when a voltage passes through it.\nNow these grid lines act like a type of coordinate system or like a map.\n\n**So how does the screen know where you have touched on the screen??**\n\nWhen you touch the screen the  **capacitance of the capacitors on that particular position changes.From there the internal circuitry will determine the contact points.**\n\nHence our phone knows where we have touched on the screen and what we want.\n\nSo that is all for today in this post .Still a big thank you if you have read it till this far.\nIf you haven't seen the previous posts of this series here are the  links to them\nhttps://steemit.com/technology/@devroy/know-your-smartphone-1-soc-system-on-a-chip-simplified-and-explained\n\nhttps://steemit.com/technology/@devroy/know-your-smartphone-2-memory-and-storage-explained\n\nPlease leave your comments if you want to discuss something or point out a flaw.",
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      "body": "Hi there !!!\n\nWelcome to the second blog of the  **Know Your Smartphone** series .\n\nToday's post is  about those memory and storage which runs  all the apps and media you throw at your smartphone and keeps you entertained  and helps you get through your day .\n![smartphone-storage3.jpg](https://steemitimages.com/DQmZdVCoF7ugNtUKsp2LiP7Y2NtESMeeyw6tDeaBWJHxiWV/smartphone-storage3.jpg)\n(img- courtesy :http://clark.com)\n\nWell first of all,  lets get one thing clear , **memory** and **storage** are two different things. \n\nSo **memory** in case of a smartphone is primarily **RAM**  .Lets take an example here .Suppose in your smartphone you have some apps running.Now these apps cannot run if the data or the piece of information specific to each of them is not executed properly.This execution of the relevant piece of information  is done by the **RAM(Random Access Memory).**\nSo  if you have two smartphones where RAM management has been done the same and one of them has 2GB RAM and another one 3rd GB  RAM , then apps being run by the one having 3GB RAM will run more smoothly and it can run more apps than the one with 2GB smartphone .\n\nNow lets get to **Storage**\n\nWell for starters Storage devices are devices that store electronic data for long/short term retainment. \nNow there is your phone's internal memory and extra memory you can add to your phone (external memory ).\n\n**Internal memory**  is the manufacturer-installed storage space, usually 16, 32 or 64GB, where the operating system, pre-installed apps and other system software is installed.\n\n**External memory**  is the memory you add externally to your smartphone through micro SD cards .These days some smartphones do not give you an external SD card slot .If thats the case then you are stuck with your phone's internal storage unless your smartphone manufacturer has given you  some kind of  access to **cloud storage**.\n\nTo overcome the problem of reduced internal storage space, several high-end smartphones are sold with **free cloud storage accounts**. This could be 10, 20 or even 50GB. Whilst this is a nice extra, bear in mind that not all data and files can be saved to cloud storage (apps for example). You will also be unable to access files stored in the cloud if you do not have a Wi-Fi or mobile data connection.\n\nSo that is all for today in this post .I am pretty sure most of you know what has been written in this post.Still a big thank you if you have read it till this far.\nIf you haven't seen the previous post of this series here is link to it \nhttps://steemit.com/technology/@devroy/know-your-smartphone-1-soc-system-on-a-chip-simplified-and-explained\n\nPlease leave your comments if you want to discuss something or point out a flaw.",
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      "body": "We all own a smartphone in today's world.In fact we can't even imagine a day without them.\n\nDue to all the tech geeks out there and a new smartphone coming out almost every week we all know about those geeky specifications (**Snapdragons,Apple Bionics,Mediateks** ) but do we really know what principle they are based upon?\nIf you do then this post won't be of much help to you.But if you don't and you have some time to kill then read on...\n\nFirst of all let me make this clear to you .Smartphones these days are as powerful as a PC and they definitely  can perform all the tasks that your PC can .But as we know PCs are bulky and space consuming, then how does a smartphone or a tablet achieve that in such a small form factor?\n\nThe reason is because of the  **SoC (System on a chip )** concept.\n\nSo what is this **System on a chip (SoC)** concept?\n\n**Below is a image which represents  a typical SoC .**![56fd3c539b570-Figure+1+-+complex+SoC.jpg](https://steemitimages.com/DQmWCRe7VKKn7hU9LXRcfGXA3tDNocQSpA5zdn62oYyHLpg/56fd3c539b570-Figure%2B1%2B-%2Bcomplex%2BSoC.jpg) **(img- courtesy :www.embedded-computers.com)**\n\n**A system-on-a-chip (SoC) is a microchip with all the necessary electronic circuits and parts for a  given system, such as a smartphone or wearable computer, on a single integrated circuit (IC).**\n\nIn other words a system on a chip as the name suggests is the complete system minus some peripherals built  on top a chip ,all the essential system  built into it integrated into one.\n\nIf you see the image above you will see there  is a section in the SoC labelled as  **CPU cores**.This is the place all the Snapdragons ,Intel,Apple's A11 bionics ,Mediateks go .\n\nThe SoC also has in it a GPU(Graphics Processing unit ), on-board memory ,peripherals,sensors,Signal Processing unit ,connectivity modules among others.\n\nOne advantage of having everything on board a single chip is that the space consumption is less(as you would have guessed ) and efficiency is also better.\n\nOne important difference between PC and a smartphone is that smartphone chips are manufactured using **ARM architecture** while PCs are not.\n\nThis is where the smartphone or a tablet differs from a PC .Majority of PC manufacturers these days still do not use the SoC concept .But work is being made in that direction. \n\nThat is all for this post !!.\nThis post just gives a basic idea about an **SoC** .It is no where near a complete and exhaustive explanations of it.\n\nI had some help from **wikipedia.com** and **Whalts.com**  while creating this content . \n\nPlease leave your comments if you want to discuss something or point out a flaw.",
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      "title": "Know Your Smartphone #1  : SoC(System on a chip ) simplified and explained !!!"
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