I still remember that the mobile phone of the 1980s was the big brother, but with the development of technology, we now have a smart touch -screen mobile phone. In recent years, the development of mobile phone technology can be described as changing with each other, and the touch screen mobile phone seems to be “high -tech”. So, how does touch -screen phones develop this way now?
In 1994, IBM launched the Simo Personal Communicator, which uses a black and white screen of pressure sensing to replace physical buttons. This phone is equipped with a touch pen, which can be used to record text. This phone can even send fax. Later, touch technology began to make great ways to the mobile phone market, and touch -screen phones have become the focus of competition in major manufacturers.
The early touch screen mobile phone screen was a resistance touch screen. This touch screen was used as a layer of glass or organic glass as the grassroots. The surface was coated with a transparent conductive layer (OTI, oxidation), and a layer of external surface hardening treatment was smooth. The scraping, the inner surface is also coated with a layer of OTI plastic layer. A two -layer OTI conductive layer appears a contact point to convert the touch into XY coordinates. The resistance touch screen is not affected by dust water pollution, but it is easily damaged by sharp objects, and because it is often touched, the surface OTI will occur small cracks and even variable after a certain period of time, which eventually leads to touch failure.
In addition, this touch screen technology experience is poor. One of the reasons is that the touch screens at that time need to be touched. After that, manufacturers including Motorola, Sony Ericsson, HTC and LG were exploring better touch screen technology. The launch of the iPhone in 2007 became a milestone in the development of the touch industry, and at the same time, it also opened the journey of touch screen to the mainstream control interface.
The biggest change of iPhone as a touch screen phone is to replace the capacitance touch screen from the resistance touch screen. The capacitive touch screen uses the human body electric field. A coupling capacitor forms a coupling capacitor between the fingers and the conductor. The current emitted by the four -sided electrode will flow to the contact. The double glass of the capacitor touch screen can not only protect the conductor and sensor, but also effectively prevent external environmental factors from affecting the touch screen.
Nowadays, the more touch screen technology is developing slowly. In addition to resistive and capacitive touch screens, it is still
A new touch screen appears, that is, the pressure -sensitive touch screen
However, the pressure -sensitive touch screen is also divided into a pressure -sensitive capacitance screen and a voltage -sensitive electromagnetic screen, such as the difference between a capacitive touch screen and a resistance touch screen. The voltage -sensitive electromagnetic screen adds the electromagnetic screen pressure sensing technology, which can determine the size of the use of pressure, but the dedicated pen is required to accurately identify the pressure. If you do not use a special pen, it is just an ordinary capacitor screen, such as Samsung’s Note series. The mobile phones are all used by electromagnetic screen compression technology.
The pressure -sensitive capacitor screen can feel the pressure without a dedicated pen, but it does not recognize the size of the pressure. For example, Apple’s 3D Touch, compared with Samsung, the ability to judge the pressure is thousands of times.
The development of touch screen mobile phones has undergone a lot of changes. From the resistance screen to the capacitor screen to the voltage electromagnetic screen, our mobile phone has also changed dramatically, and we are more convenient in the process of using. In the future, we must have the technology of updating more, we can wait and see.
【The picture of this article comes from the Internet】