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 Know How to Work Touch Screen

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naveen chand



Posts: 29
Join date: 2010-09-11
Age: 30
Location: NEPAL (Nawalparasi)

PostSubject: Know How to Work Touch Screen   Sat Nov 13, 2010 2:56 pm

Know How to Work Touch Screen

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

1. Screen Resistive

Resistive system screen 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 deliver an electrical signal, whereas the resistive layer is a layer that holds an electrical current.

Both layers are separated by a transparent divider spots, so this layer must be separated from each other under normal circumstances. Conductive layer on the flow of electric current also served as the reference flow.

When it happens to touch the two layers will be forced to directly contact each other physically. Because of the contact between the conductive layer and resistive then there will be interference with the electric current reference.

The effects of this disruption on the conductive layer is going to happen changes in electrical currents in response to a touch event. Change the value of the reference current is then reported to controllernya to be processed further.

Contact information was processed mathematically by the controller so as to produce an accurate coordinates and positions of these 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 vulnerable and weak to touch objects rather sharply.

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. Very suitable for industrial purposes in the world such as in factories, laboratories, and 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 weakness for this screen is if 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
Example: HP who use resistive screens are Samsung Star, Sony W950 erricsin device. Siri-characterized with a stylus in the package included his cell phone. Select a container that uses a flip model, so the screen can be protected from the pressure. Contrast is not recommended to use HP's container pouch model.

2. Capacitive Screen

Capacitive system has a coating that is key to the way it works, ie packaging that is capasitive on the entire surface. Touchscreen panel is equipped with a coating made from indium tinoxide which could continue for the electric current is continuous, 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 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 is changed because there are electrical currents that changed the entrance to the sensor. Information from this incident in the form of electrical current will be received by sensors that will be forwarded to a controller. Position calculation process will be started here.

This calculation uses the position of the four points sudur on touchscreen panel as 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 points will be integrated with other programs to run an application.

Capasitive new touchscreen can work if it touches aimed at him from conductive objects such as fingers. Display screen has the clarity to about 90%, making it suitable for use in various purposes of interaction 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 existing electrical charge our body. This capacitive touch screen models have almost no significant weakness, because this screen is the latest development to replace the resistive screen.

Indoor: very good
Outdoors: very good
Superiority: This type of screen not affected by pressure, so even if HP put dikantong not a problem. The use of container pouch model could be categorized as safe. Its characters are not included stylus in his cell phone package.
Example: HP that use capacitive screens are Samsung Corby Touchscreen, iPhone.

3. Surface Acoustic Wave System

Touchscreen technology utilizes ultrasonic waves to detect events at the surface of the screen. Inside there are two touchscreen monitor transducer, transmitter 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 this transducer is installed in all four sides, two vertical and two horizontal. When he touched the touchscreen panel, there is a part of the wave is absorbed by touch, such as hindered by the hand, stylus, keyboard, and more. His touch had been making changes in the emitted waveform.

Changes in ultrasonic wave that occurred subsequently accepted by the receiver and translated into the form of electrical pulses. Further information had been turned into a form of touch data will be forwarded to the controller for further processing.

Data generated from this touch of course is 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, therefore be a touchscreen device that you can use.

This technology does not use a metallic coating materials but a layer of glass, the touchscreen display of this type could carry up to 90 percent of light, so much clearer and brighter than the Resistive touchscreen.
Without the coating also makes the touchscreen type of sensor has 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 disrupted by elements such as dust, water, and other solid objects. There just a little dust or other objects stuck on it then touchsreen can detect it as a touch.
Touchscreen this type suitable for use in the computer training room, the room needs to display information in a very clear and sharp, and during a 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 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 positions and move the position of objects on the screen like photos or games.
Multi touch screen is usually used in cell phones, computers, MP3 players, and so forth.[b][u]
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