Touchscreen

Technology develops so quickly. Almost all the things that used to only be mere dreams had become reality. Including touchscreen technology. We have already developed touchscreen technology.
What is a touchscreen?
A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touching the display of the device with a finger or hand. Touchscreens can also sense other passive objects, such as a stylus. Touchscreen is common in devices such as all-in-one computers, tablet computers, and smartphones.

Some of the touchscreen technology which each has its own function and its usefulness in its application:
1. Resistive Touchscreen
Touch screens are included in this type of screen is a touch screen that is coated by a thin layer of metallic color that is conductive and resistive to electrical signals. The purpose of which is conductive layer is a layer that is easy to conduct electrical current, whereas the resistive layer is a layer that holds the electric current. Both layers are separated by a transparent divider spots. On the conductive layer is also in charge of electric current flowing as a current reference.
When there is a touch, the second layer 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 further processing.
Information last touches are mathematically processed by the controller so as to produce an accurate coordinates and the position of the touch. That information is then integrated with other programs so that it becomes easy to use application.
The drawback of this technology is the resulting screen only has a level of image clarity by 75% only.

2. Surface Wave Touchscreen
Touchscreen technology utilizes ultrasonic waves to detect events at the surface of the screen. In tuochscreen monitors 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.
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 on hand position 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 can be used.
Touchscreen type is claimed as the most advanced type of touch screen and has many advantages than the other two types of touchscreen. Because of not using 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 or thirsty when in touch, no coating will be damaged when exposed to water, oil, dust, and more.
But the touchscreen is also not without its weaknesses. Although physically immune to interference outside elements, the performance of the touchscreen can be harassed 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. Ultrasonicnya sensors will work properly. So it is a touchscreen of this type should be kept with extra care. Touchscreen type is very suitable for use in computer training room, indoor purposes to display information with a very clear and sharp, the presentation in the room, and more.

3. Capasitive Touchscreen
Touchscreen this type may work quite complicated, but very reliable in the durability and clarity. Capasitive touchscreen has a wrapper layer that is the key to how it works, ie packaging that is capasitive on the entire surface. Touchscreen panel is equipped with a wrapping layer made from indium tinoxide which could continue electric current is then directed to continue 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. Controller serves to forward the information to the position of interference pengalkulasi machine or touch. Position calculation process will begin here.
Capasitive touchscreen is very different from the previous two types of touchscreen. This type of new touchscreen can work if the touches against him comes from objects that are conductive such as your fingers. Unlike resistive or surface wave that can be touched with a finger or stylus, the touchscreen can only be operated by finger alone. But with the nature of this kind, the touchscreen is not easily affected by interference from other objects on it such as dust or water.