Know the type of touch screen (touchsreen) can help the knowledge of touch screens on mobile phones and other equipment of today.
There are three types of touch screen (touchsreen), ie resistive, capacitive and surface acoustic wave system.
1. Resistive Screen
Resistive system screen is coated by a thin layer of colored metallic conductive and resistive to electrical signals. The purpose of the conductive layer is a layer that is easy to conduct electrical signals, while the resistive layer is a layer that holds the electrical current.
These two layers are separated by a separator transparent spots, so this layer must be separated from each other under normal circumstances. On the conductive layer is also in charge of electric current flowed as the reference flow.
When there is a touch of the second layer will be forced to directly contact each other physically. Because of the contact between the conductive layer and resistive it will be an interruption in electrical current reference.
The effects of these disorders on the conductive layer is going to change electrical currents in response to a touch event. Change the value of the 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 the application is easy to use.
Screen with this technology has the highest 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 many more.
Simplified definition:
The screen is how it works had to be suppressed, can use a finger or any object on the screen who emphasized. The downside 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
Outdoor: less than optimal
Examples of HP who use resistive screens are Samsung Star, Sony Erricson W950. Characteristics with the included stylus is within his cell phone package. Choose a container that uses a flip model, so the screen can be protected from pressure. By contrast container is not recommended to use the HP model pouch.
2. Capacitive Screen
Capacitive system has a wrapper layer that is the key to how it works, that is a wrapper which is capacitive in the entire surface. Touchscreen panel is equipped with a coating made from indium tinoxide which could continue electric current is continuous, for then directed into the sensor.
This layer can take advantage of the capacitive nature of the hand or the human body, and therefore this layer was employed as a touch sensor in this type of touchscreen. When the layer is in normal status (without any touch of the hand), the sensor will be given an electric current value is used as reference.
When your fingers touch the surface of this layer, then the reference value was changed because there are electrical currents that change coming into the sensor. Information from this incident in the form of electrical current will be received by the sensor to be transmitted to a controller. Position calculation process will start here.
This calculation uses the position of the four points sudur on touchscreen panel as a reference. When the results of the calculation is obtained, then the coordinates and the position of the touch can be designated in the know with the good. Finally, information from these positions will be integrated with other programs to run an application.
The new capacitive touchscreen can work if the touches put to him comes from objects that are conductive such as a finger. 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:
Should be with the touch of a finger, can not use other objects (nails, stylus, etc.). Because these screens work by using an electrical charge that is our body. Capacitive touch-screen model is almost no significant weakness, because this screen is the latest development to replace the resistive screen.
Indoor: very good
Outdoor: very good
Advantage: the display of this type are not affected to pressure, so even if HP put dikantong not a problem. The use of container pouch model can be considered safe. Characteristics are not included stylus in his cell phone package. Examples of HP who use capacitive screens are Samsung Corby touchscreen, the iPhone.
3. Surface Acoustic Wave System
Touchscreen technology utilizes ultrasonic waves to detect events at the surface of the screen. In the touchscreen monitor there are two transducers, the sender and receiver of ultrasonic signals.
Also equipped with a reflector that serves as a deterrent so that ultrasonic waves remain on the monitor screen area.
Both transducers are installed in all four sides, two vertical and two horizontal. When it touched the touchscreen panel, there is a part of the wave is absorbed by touch, such as hindered by the hand, stylus, keys, and more. The touch had made changes in the waveform emitted.
Changes in ultrasonic waves that occur subsequently accepted by the receiver and translated into electrical pulses. Further information had been transformed into a form of touch data will be forwarded to the controller for further processing.
Data generated from this touch of course is the data about the position of your hands that touch the ultrasonic signal. If this is carried out continuously and there are many ultrasonic wave sensor that touches on the media, then be a touchscreen device that you can not use this gunakan.Teknologi metallic coating material but a layer of glass, the touchscreen display of this type could carry light up 90 percent, making it clearer and brighter than Resistive touchscreen.
Without the coating also makes the touchscreen sensors of this type become more robust and 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 interrupted by elements such as dust, water, and other solid objects. There is very little dust or other objects in the top of the touchsreen can detect it as a touch.
Touchscreen type is suitable for use on computer training room, need the room to display information in a very clear and sharp and the presentation in the room.
4. 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 advantage of the 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 enlarge, shrink, change position, and move the position of objects on the screen such as images or games.
Multi-touch screen is commonly used in cell phones, computers, MP3 players, and so on.
