Know how to work the touch screen (TOUCH SCREEN)

Recognize how to work the touch screen can help to maintain and differentiate the types of touch screens on today's mobile phones. There are 3 types, ie resistive, capacitive and surface acoustic wave system.

1. Resistive Screen

System resistive screen is coated by a thin metallic layer which is conductive and resistive to electrical signals. The purpose of which is conductive layer is a layer that is easy to deliver an electrical signal, whereas the resistive layer is a layer that holds the electric current.

Both layers are separated by a transparent divider spots, so this layer must be separated from each other under normal circumstances. On the conductive layer is also in charge of electric current flowing as a current reference.





When there is a touch of both of these layers will be forced to immediately come into contact with each other physically. Because of the contacts between layers of conductive and resistive it will be an interruption in electrical current reference.

The effects of this disorder on the conductive layer is a will there is a change electrical currents as a reaction from a touch event. Change the value of reference current is then reported to the controller for the process further.

Information last touches are mathematically processed by the controller so as to produce an accurate coordinates and the position of the touch. Then the information is integrated with other programs so that it becomes easy to use application.

Screen with this technology has the level of image clarity by 75% only, so that the monitor will seem less clear. Touch sensors of this type are very fragile and weak to touch objects that are somewhat sharp.

This technology will not be affected by other elements outside such as dust or water, but will respond to all touch about it, either using your fingers directly or using another object such as a stylus. It is used for industrial purposes in the world such as in factories, laboratories, and more.

Simplified definition:

The screen is how it works should be suppressed, can use a finger or any object which is emphasized in the display. Drawback to this is if the screen is placed dikantong (especially pants pocket), can be depressed, press and caused the screen to be easily damaged because it is often depressed.

Indoor: very good
Outdoors: less than optimal

Examples of HP that use resistive screen is the Samsung Star, Sony Erricson W950. Siri-character is with the included stylus in his cell phone package. Choose a container that uses a flip model, so the screen can be protected from pressure. Contrast is not recommended to use the HP model pouch container.


2. Capacitive Screen

Capacitive system has a wrapper layer that is the key to how it works, the packaging is capasitive on the entire surface. Touchscreen panel is equipped with a wrapping layer made from indium tinoxide which could continue electric current is continuous, for then directed to the sensor.




This layer can utilize capacitive nature of the hand or the human body, and therefore this layer was employed as a touch sensor in this type touchscreen. When the layer is in normal status (without any touch of the hand), the sensor will be given an electric current value which is used as a reference.

When your fingers touch the surface of this layer, then the reference value is changed because there are electric currents that changed the entrance to the sensor. Information from this event in the form of electrical current will be received by the sensors are forwarded to a controller. Position calculation process will begin here.

This calculation uses the position of the four-point sudur on touchscreen panel as a reference. When the calculation results obtained, the coordinates and the position of the last touch to the well-known. Finally, information from these points will be integrated with other programs to run an application.

Capasitive new touchscreen can work if the touches against him came from conductive objects such as fingers. Display screen has a clarity of up to about 90%, making it suitable for use in a variety of purposes interactions in the general public such as in restaurants, electronic kiosks, Point Of Sales location, etc..

Simplified definition:

Must be with the touch of a finger, can not use other objects (nails, stylus, etc.). Because these screens work by using electrical charges that exist in your body we. Capacitive touch screen model is almost no significant weakness, because this screen is the latest development to replace the resistive screen.

Indoor: very good
Outdoors: very good

Advantages: This type of screen is not affected to pressure, so even if HP put dikantong not a problem. The use of container pouch model can be considered safe. Its properties are not included stylus in his cell phone package. Examples of HP that use capacitive screens are Samsung Corby Touchscreen, iPhone.


3. Surface Acoustic Wave System

Touchscreen technology utilizes ultrasonic waves to detect events in the surface of the screen. In the touchscreen monitor We have two transducers, the sender and receiver of ultrasonic signals.

Also equipped with a reflector that serves as a deterrent for ultrasonic waves remain on the monitor screen area.

Both transducers are installed in all four sides, two vertical and two horizontal. When he touched the touchscreen panel, there are parts of the wave is absorbed by the touch, such as hindered by the hand, stylus, keys, and more. The touch had made changes in the form of waves emitted.

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Changes in ultrasonic waves that occur subsequently accepted by the receiver and translated into electrical pulses. Further information on the touch had been transformed into a form of data to be forwarded to the controller for further processing.

Data generated from this touch of course is the data about the position of your hand that touches the ultrasonic signal. If this is done continuously and there are many ultrasonic wave sensor that touches on the media, then be a touchscreen device that you can use.

This technology does not use a metallic coating material but a layer of glass, the touchscreen display of this type are able to continue lighting up to 90 percent, making it much clearer and brighter than the resistive touchscreen.

Without the sensor layer also makes the touchscreen of this type become stronger and more durable because there will be no layers that can be damaged when in touch, when exposed to water, oil, dust, and more.

The disadvantage is the performance of the touchscreen can be disturbed by elements such as dust, water, and other solid objects. Few there is dust or other objects attached on top of it then touchsreen can detect it as a touch.

Touchscreen this type suitable for use in computer training room, indoor use to display information with a very clear and sharp and the time of presentation in the room.

Multi Touchscreen

Multi touch screen is the development of touch screen technology that already exists. From the meaning of the word "multi" which means a lot, already seen that the benefits of touch screen can be touched by more than one finger. Multi-touch screen is capable of being touched by the finger of dozens of different people simultaneously.

Multi-touch screen can be used to raise, shrink, change position, and move the position of objects on the screen such as images or games.

Multi-touch screen is commonly used in mobile phones, computers, MP3 players, and so forth.
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