Tuesday, November 23, 2010

Working of Touch Screen Mobiles

  • What is the working principle behind touchscreen mobiles?
  • How do they differ from ordinary mobiles?
  • What are their drawbacks?

This post is intended to answer these kind of questions that usually arises in user minds.Mobile phones may use two types of input devices. In regular mobile phones, a keypad type of device is used, which is mounted separately from the screen of the cellphone. Whereas in touchscreen cellphones, a touch screen is a cellphone display screen that also acts as an input device. The touchscreens are sensitive to pressure; a user interacts with the mobile applications by touching pictures or words on the screen.

Most mobile phone keyboards are basic in that they use a tactile surface you are accustomed to touching, and underneath is a basic rubber peg (black dot) which travels some depth until it encounters resistance in the form of the actual keyboard surface which is sometimes called a ‘bubble board.’ This is basically a semi-circle of aluminium shaped in the form of a dome and provides that springing effect of key and feedback on your finger when you press down and the button regains its at-rest shape and normal position.

Touchscreen technologies used in mobile phones include resistive, capacitive and surface-wave based system.

Resistive.
The resistive system consists of a normal glass panel that is covered with conductive and resistive metallic layers. These two layers are held apart by spacers, and a scratchresistant layer is placed on top of the whole setup. An electrical current runs through the two layers while the monitor is operational.

When a user touches the screen, the two layers make contact exactly at that spot. The change in the electrical field is noted and the coordinates of the point of contact are calculated by the processor. Once the coordinates are known, a special driver translates the touch into something that the operating system can understand, much as a computer mouse driver translates the movements of a mouse into a click or a drag. The change in the electrical current is registered as a touch event and sent to the controller for processing.

Capacitive. In the capacitive system, a layer of an electroconductive material (most often indium tin-oxide) that stores electrical charge is placed on the glass panel of the monitor. When a user touches the monitor with his finger, some of the charge is transferred to the user, so the charge on the capacitive layer decreases. This decrease is measured in circuits located at each corner of the monitor. The computer calculates, from the relative differences in charge at each corner, exactly where the touch event took place and then relays that information to the touchscreen driver software.

Resistive touchscreen panels are generally more affordable but offer only 75 per cent clarity and the layer can be damaged by sharp objects. Resistive touchscreen panels are not affected by outside elements such as dust or water.

One advantage of the capacitive system over the resistive system is that it transmits almost 92 per cent of the light emitted from the monitor, whereas the resistive system transmits only about 75 per cent. This gives the capacitive system a much clearer picture than the resistive system. Also, the capacitive system has a very long life (about 225 million clicks). The bad news is that this touchscreen type cannot be activated by contact with inanimate objects (e.g., the gloves that you might be wearing).

20 comments:

its.mark.henry said...

yup.. the transmitters service in touch screen mobiles is awesome as i am also using a touch screen one :)

Hp Laptop Repair said...

It is really master piece of advance technology, that we are working on touch screen, the touch screen concept is awesome...

pro series said...

I have an HTC Hero touch screen. Let me Tell you that's it feels amazing when you use a sensitive touch scree phone.

computer recycling said...

I have an iphone 4 and the touch screen is great. Even when im not 100% accruate the touch screen still manages to find the right keys = genius! Interesting to read about the tech behind it.

Toshiba Motherboard repair said...

Thanks for explaining the features as well as drawbacks of touch screen mobiles. It is an awesome advancement in technological field.

nvidia graphics card repair said...

It is a great set of mobiles, they have all the latest facilities in it. They are too reliable.

London Website Design said...

I am really impressed that there so much about this subject thats been uncovered and you did it so well. Thanks for sharing.

Learn to Run said...

This is very nice touch screen model the electronic company has been published on the site because in this mobile so fantastic and good features are available. And can be operate only touch the finger and can be run the mobile so very nice and good services.

chicken coops said...

It is very nice model has been launched. Because in this model has a good features and fantastic function that can be operate touch screen so very nice services.

Dallas Dj said...

It has been published the touch screen mobile. Mostly people are very like in this mobile because the mobile company has been published a new model design and fantastic features so that can be used with touch on the finger mobile can be operate also.

CD Replication said...

Very informative post. Thanks for taking the time to share your view with us.

stretch tents said...

Touch screen model is good working and interesting model in this model has nice features and more fantastic function in this model.

abbott.simth said...

Touch screen model is very good model because the manufacture company has been developed the new model published in the market because in this model has good features and more interesting function like digital sound .Mega pixel camera.

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abbott.simth said...

This is nice and more interesting model shared we can be know that and used in this features and nice function so that can be used it.


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abbott.simth said...

Charge is transfer to the user, consequently the charge on the capacitive layer decreases. This diminish and further function and imaginative also.


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abbott.simth said...

This decrease is measured in circuits located at each corner of the monitor. The computer calculates, from the relative differences in charge at each corner, exactly where the touch event took place and then relays that information to the touchscreen
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abbott.simth said...

Serve you as a type of little notebooks, in which you can write big texts and reminders easily. It is just like a little computer on your hand. Using a handset has never been as fast as it is today. With touch-screen cell phones, you type messages, use browsers at super fast speed.



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abbott.simth said...

It almost impossible for the reader to understand. There are so many new functionalities added which makes the touch screen cellular device the most wanted technology in the modern era.




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Stone Gold said...

What an awesome post many many thanks for this i hope you will share more post like this.
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amisha S said...

Amazing blog..Nice to hear about the working principle of touch screen mobiles..It will be definitely new to everyone..

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