What are the characteristics and limitations of touch screens.

Capacitive, resistive, infrared ...... Although readers may have used to draw their fingers on the screen, I was surprised to know that there was such a screen that could be operated by touch?

Now, let's take a look at the characteristics of various touch screens, and what limitations exist at the same time.

The Representative Models of the resistive touch screen are Samsung Messager touch and HTC Touch diamond. This screen is made up of Multilayer Materials. When the surface of the touch screen is under pressure, the top layer and the bottom layer are in contact with each other to generate an electrical signal to change the current. The position is determined by computation and corresponding operations are completed.

Capacitive touch screens are the first iPhone, HTC hero, and blackberry storm models. When the fingers touch the screen, the electric field of the human body leads to a coupling capacitor between the fingers and the screen. The current flows out from the electrodes at the four corners of the screen, and the position is obtained through precise calculation.

Samsung u600 adopts infrared touch screen, which is divided into two types: thermal and optical. When using a thermal screen, you need to use an object with a certain temperature to touch the screen. The optical touch screen uses sensors to divide the screen into several small grids through invisible beam, and calculates the touch position based on the horizontal and vertical axes.

In terms of cost, the most expensive is obviously the infrared touch screen, and the first two are cheaper.

The resistance screen must be made of multi-layer materials. The capacitive screen and the red screen are generally made of glass, which means that the glass screen and the red screen are good in durability, the durability of the resistive screen is relatively poor.

The input conditions of the Resistance screen and the red screen are relatively loose. Fingers, gloves, and pens are acceptable. The Thermal Screen requires warm fingers. This is a bit dull. Is it swollen in winter? The capacitive screen can only be touched by fingers. Even if the screen is scratched by a pen, the system will not respond a little.

The visual effect of the Resistance screen is poor outdoors, and the latter two are relatively good, but for the optical screen, the outdoor glare will affect the screen accuracy.

The resistive screen does not support multi-point touch, and the latter two are supported.

After the above analysis, I have a general understanding of several screens. I also need to give this article to my mom so that the old man would not always use a pen to shoot at the screen and ask me why the screen is broken, why can't I use your dad's cell phone? Oh, you are using a capacitive screen!