Tag Archive: Touchscreen

Nokia Lumia 610

Nokia Finally Understands the Public demand for Smart Phones at a lesser price and brings down its series of Lumia ( Windows OS ) Phone to a cheaper price by releasing its new product LUMIA 610 which is priced at a much lower price than its   former Series phones….

As we all know that Nokia is facing a very tough competition from Android Smart Phones, It is more focusing to get smart phones at a cheaper price…. 

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Sony Xperia S

Sony has launched its new smart phone Xperia S with features like NFC and Xperia Smart Tags to provide consumers with a unique smartphone experience.Another interesting technology used in Xperia S is float touch navigation system .. The 4.3-inch LCD display outguns older Xperias with a bright and contrasty 1280 x 720 resolution. The display on the handset is undeniably gorgeous. It’s a 4.3in TFT touchscreen, boasting a resolution of 1280×720 with 16 million colours .

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Aakash Tablet vs Ubislate

Everyone was excited and pumped up when the Aakash tablet was launched. Dubbed as the cheapest tablet in the world, the Aakash tablet, is manufactured by a UK-based firm, Datawind. Its launch was aimed at equipping a tablet into the hands of every student in India. A Government initiative you can say. When it was launched, it didn’t disappoint. But neither did it satisfy everyone’s wish.

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In my last article we have gone through about the structure and properties of graphene. Now we are going to have a look at the futuristic screen which is transparent, flexible, and portable too. These new graphene screens are Indium free and developed through flexible electrodes Graphene screens are almost completely transparent, and are highly conductive and very strong.  



Researchers have created a flexible graphene sheet with silver electrodes printed on it (top) that can be used as a touch screen when connected to control software on a computer

Anyone with a smart phone or an iPad will tell you touch screens are the way of the future. But touch screens have some serious drawbacks, such as how expensive they are, not to mention easily breakable.

Graphene is a semi-metallic transistor. Simply put a transistor hold stateful information by switching from conductive to non-conductive. A one or a zero for example.


          Flexible, see-through video screens may be the “killer app” that finally puts graphene — the highly touted single-atom-thick form of carbon — into the commercial spotlight once and for all. And this research was reported in the online edition of ACS Nano.

          The lab’s hybrid graphene film is a strong candidate to replace indium tin oxide (ITO), a commercial product widely used as a transparent, conductive coating. It’s the essential element in virtually all flat-panel displays, including touch screens on smart phones and iPads, and is part of organic light-emitting diodes (OLEDs) and solar cells.

Main point to be noted here is these graphene screens are highly conductive and strong where as ITO screens are likely to be broken easily.

A hybrid material that combines a fine aluminum mesh with a single-atom-thick layer of graphene outperforms materials common to current touch screens and solar cells.


Using a roller, the graphene face can then be pressed against an adhesive polymer support and the copper etched away, leaving the graphene film attached to the polymer. The graphene can then be pressed against a final substrate – such as polyethylene terephthalate (PET) – again using rollers, and the polymer adhesive released by heating. Subsequent layers of graphene can then be added in a similar way.

The researchers used this technique to create a rectangular graphene film measuring 30 inches (76 cm) in the diagonal. The graphene was doped by treating with nitric acid and in this form the graphene sheet can act as a large, transparent electrode and was demonstrated to work in a touch screen device.

Typically, transparent electrodes used in such applications are made from indium tin oxides (ITO). The researchers say that the graphene electrode has better transparency and is tougher. ‘The price of indium has increased by a few times over the past decades and this will be more serious as markets for display and solar cells expand,’ says Ahn.’In addition, oxide materials like ITO are usually fragile and weak.’ Because of this, ITO-based touch screens have a finite life span, whereas, a graphene-based screen should last essentially forever.

Left: A transparent graphene film transferred on a 35-inch PET sheet. Right: A graphene-based touch screen panel connected to a computer.

Courtesy: science daily, new gadget, technology review, sciencemag, rsc.org

Posted by

Gopi Chand (MGIT ECE 4th year)

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Swype: Text Input Technology for Touch Phone

I find typing on QWERTY phones easier and faster than on touch phones that lack the classic tactile feel. But recently, I have been feeling strongly inclined towards the touch phones primarily because of the revolutionary technology called Swype.

Some of you might have been already using it without even knowing that it’s Swype at work. Just like iPhone has been declared a revolution, I would say Swype has every bit of chance to be declared a revolution soon. Okay, but what is it? You want to know, right?

What is Swype?

Swype is a new patented text input mechanism, introduced by Swype Inc., that allows you to input text in a easier and faster way while using the standard QWERTY keyboard layout of your touchscreen phone. In fact, it is so fast that you could possibly achieve typing speed of 40 words or more per minute which is simply phenomenal.

How it works?

In contrast the way we use the QWERTY keyboard in touch phones, Swype allows you to type words without typing or pressing a single key. When using Swype, you simply need to trace a path across the screen keyboard and Swype does the rest. Is it that simple? Yes, it actually is. And you can use your finger or your phone’s stylus whatever your preference maybe.

The moment you trace a path across the keyboard, Swype’s patented algorithm analyzes the path pattern and immediately recognizes the word you intended to type. For example — if you were to type the word “quick”, you simply need to connect its letters by moving your finger over letter ‘q’ through ‘u’ then ‘i’ followed by ‘c’ and finally stopping at the letter ‘k’ on the keyboard; see a graphical representation of the same below.

At first, this may sound too time consuming but once you get used to it, it would take merely a second or less in fact. Check out a video demonstration below —

But why Swype?

  • Innovative, faster and easier way to type text using standard QWERTY layout
  • Offers word suggestions for corrections
  • Learns new words automatically
  • Easy switching to regular keyboard
  • Supports foreign languages
  • Inserts spaces automatically
  • 65,000 words database

Best of all, you don’t need to be accurate, Swype is quite forgiving and understands completely that to err is human

So next time when you go shopping for a new touch phone, look for Swype support for sure. Till then, happy typing.

Posted by

Sai Kiran( MGIT ECE 2nd year)

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Types of Touch Screens

Touch Screen Types

Touch screens appliances are selling like a hot cake now –a – days because of its easy use and availability in various sizes. Any display device with touch screen feature sell as it comes in the market. Although people appreciate and enjoy this amazing new feature yet most of them don’t know about different types of touch screen. Different types of technologies are used in the formation of touch screen. As technology experiments are going on to derive the best devices ever so is the case with touch screen.

Different types of touch screens have different feature, characteristics and differences. These differences are resulted in different qualities of touch screen; some are long life others are sensitive while some others are economic.

Resistive Touch screen

This type of touch screen is made up of three sheets;

  • conductive
  • resistive
  • protective layer

For making the touch screen conductive and resistive layer are place together with a space between. This space allows the current to pass through it when finger press the screen. This current receive the information is then processed into the desired action. The upper layer on the glass is protection layer so that it protects the screen from scratches in case of odd resistance.

Ex : Nokia 5800

Advantages of Resistive Touch Screen

  1. It has comparatively longer life.
  2. It is used in many different ways.
  3. It is a very common type of touch screen.
  4. It is cheap and so approachable.
  5. Due to their durability, they are widely used in commercial zone.

Disadvantages of Resistive Touch Screen

  1. It emits less light as 75 % so fails to give sharp image.
  2. Its appearance is bulky.

Capacitive Touch screen

As the name describe the type of this touch screen. A thin capacitor or electronically charge sheet is placed on the glass. In response to the finger touch some of the charge from the capacitive layer shifts to the finger.
An interesting myth works over here for the functionality of touch screen. You know that capacitor works with electricity then what is the reason it responses to the human touch. Do you remember that electric shock is given to the human heart at the time of heart failure? This is because many electrons are moving in the human cells. When we touch the capacitive screen some of the charge from the screen travel towards the finger and on sheet it decreases.  This reduction in charge sheet processes the application on touch screen.

Ex: Samsung Wave or Samsung Corby

Advantages of Capactive Touch Screen

  • It emits 90% of light ray to make screen clear.
  • It has long life because of the resistivity.
  • It wont get unnecessarily  touched by ur Shirt in your Pocket.

Disadvantages of Capactive Touch Screen

  • They are sensitive only for the fingers touch no other object like stylus can be sensed.

Surface acoustic Wave Touch screen

This is the more advanced types of touch screen. They are fast and have sharp image. In this touch screen three sheets are used to perform the action;

  • Sending transducer
  • Receiving transducer
  • Reflectors layer

Both transducers are used in making of screen and these transducers enable the screen to sense the outer touch and reflectors help in giving the proper response. This whole mechanism works through the wave transmission. When we touch the screen a wave produced and transfer from one transducer to the receiver where reflectors get the message. This wave travels back to the specific place and perform the action.

Advantages of surface acoustic wave touch screen

  • Because of this wave mechanism versatile action can be done.
  • Being no electric field created, it emits 100% light resultantly quality image received.

Disadvantages of surface acoustic wave touch screen

  • They tend to have very short life.
  • They are expensive so out of reach of a common man.
  • They can be easily damaged.


Posted by

Mahesh( MGIT ECE 3rd year)

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