Do you really understand the touch screen of your phone that you rub every day? Why does the touch control malfunction when the screen gets wet? Why does applying a film not affect phone touch, but wearing gloves can? What are the types of touch screens on mobile phones, and what are their principles?
In 1992, IBM unveiled the world’s first touchscreen phone, the Simon, at the World Computer Expo. On the basis of the original functions of mobile phones, it has added an intelligent data collection system, which can realize the functions of call machines, personal digital assistants, and fax machines, and also embedded a touch screen. So to some extent, this is still a smart touch screen phone, but its actual experience is quite poor. Two years after the press conference, this phone was officially launched and sold to 190 cities in the United States for $899. At that time, users who used the phone all stated that it was a rather difficult phone to use.
Its screen adopts the earliest resistive touch screen, which requires the use of a stylus or nails to operate. The resistive touch screen mainly consists of two parts, a sensing film and a piece of glass. The side between them is coated with a thin layer of metal oxide, which has good conductivity and is transparent when viewed on the screen. The coating on the glass is called the outer coating, and the coating on the sensing film is called the inner coating. There is a transparent isolation point between glass and thin film. When operating the touch screen, the upper and lower layers of coating will come into contact with each other, generating electrical signals. At this point, the sensor will transmit the horizontal and vertical coordinates of the contact point back to the phone processor, achieving touch screen interaction.
