Facts | Three types of touch screens. The principle of touchscreens




Facts | Three types of touch screens. The principle of touchscreens

First touch screens (touch screens) are extremely rare. They can be found mainly in only a few PDAs (PDA, PDA). As is known, these devices have not been widely adopted because they lacked the most important: the functionality of the phone. history of smartphones is closely related to the touchscreen. And so the modern man with a “smart phone” in the pocket of a touch screen can not be surprised. Touch screen is widely used in fashion and expensive device and even in the relatively cheap phones. But we will once again discuss the advantages and disadvantages of various phone models. In this regard, each user is able to define himself. Let’s talk about the principles of the three types of touch screens, which you can find in a modern device.

So, touch screens have ceased to be too expensive. In addition, touch screens have become much more “responsive” and touch by now recognize excellent. This paved the way for them broad masses of users. At present there are three main design touchscreens:

Resistive or simply “elastic» (Resistive)
Capacitive (Capacitive)
Wave (Surface acoustic wave)

About resistive touchscreen. The recent past

Резистивный тачскрин

The resistive system represents a normal glass, coated with a layer conductor of electricity and resilient metal “film” is also having conductive properties. Between these two layers by means of special spacers leave empty space. A screen surface is covered with material that protects it from scratches.

During operation, a user with a touchscreen, the electric charge passes through both layers. How did it all happen? The user touches the screen at a certain point, and the upper elastic layer comes into contact with the ductor bed. And it is at this point. The computer then determines the coordinates of the point has been touched.

When the coordinates of the device are known, a special driver translates the touch of a well-known operating system commands. Here draw an analogy with the driver conventional computer mouse. He has been the same: the operating system explains exactly what she wanted to tell the user pressing a button or moving the arm. On the screens of this type are most often used special stylus.

Resistance screens can be found in relatively elderly devices. It was such a touch screen was equipped with IBM Simon , the oldest of our civilization is conscious of smartphones.
The device is a capacitive screen. Digital now

Емкостный тачскрин

In this design, a touchscreen glass substrate coated with a layer, which acts as a repository of drive electric charge. His touch user releases the part of the electric charge at a certain point. This decrease is determined by the chips located in each corner of the screen. The computer calculates the difference in electrical potential between different parts of the screen, and the information about touching all the details immediately transferred into the program, the touchscreen driver.

An important advantage of the capacitive touchscreen is the ability of this type of screen to save nearly 90% of the original brightness of the display. In resistive screens is retained only about 75% of the original light. For this reason, the image on the capacitive screen looks much sharper than the resistive touchscreen design.
The wave touch screens. Bright Future

Волновой тачскрин

The ends of the axes X and Y grid glass screen located on the transducer. One transmitter and one receiver. On the glass substrate and the reflectors are “reflected” electrical signal from one transducer to another.

The converter receiver just “knows” held a press, and to what point is it happened because his touch user makes a break in the acoustic wave. Glass Wave display devoid of the metal coating that allows you to keep 100% of the original light. Because of its less pleasant features of the wave screen is the best choice for users who work in fine detail graphics. After all, the resistive and capacitive touch screens are not ideal in terms of picture clarity. Cover blocks the light and distorts the picture.
Some of the features of the different touchscreens

The cheapest and least clearly convey the picture are resistive touch screens. In addition, they are also the most vulnerable. Any sharp objects can damage the delicate resistive “plenochku.” The wave touchscreens are the most expensive of their kind. Resistive construction soon belong to the past, the wave – to the future, and the capacitive – to the present. Although no one knows the future and we can only assume that this or that technology has some prospects.

For the resistive system is of little consequence, the user has touched the screen with a rubber-tipped stylus or your finger. Enough that the two layers come in contact. The capacitive touch screen recognizes only conductive objects. Most often, users work with them through their fingers. In this regard, the construction of wave screens closer to resistive. Give her team can be almost any object, while avoiding too heavy and small objects. That is, the rod pen will not work.

Now, if the reader is not bored with the technical details and the details of the engineering, the presence of desire and free time, they can go on a visit to the creators of Xbox One – game console, which the creators of Windows managed to surprise the world.

According to the materials computer.howstuffworks.
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Tags: Display , Sensor Technology , Touch .

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