The digital era, cell phones are updated faster and faster, it is absolutely necessary to understand the knowledge of cell phone touch screen before buying a smart touch screen cell phone, here are two kinds of cell phone touch screen principle, so that you can do when you buy, to avoid being cheated.

We are the lcd manufacturersfor small size displays such as 1.8inch 128x160, 2.0inch 176x220, 2.0inch 240x320 IPS, 2.8inch 240x320, 3.5inch 320x240 and 3.5inch 320x480 IPS ect.

Cell phone touch screen is generally divided into two types: resistive screen and capacitive screen, the most common touch screen on the market is mainly what we call "lens" screen, that is, flat resistive screen and mirror capacitive screen, the difference between the two is that the resistive touch screen is commonly called "soft screen", while the capacitive touch screen is known to most people as "hard screen".

The basic principle of touch screen: the functional part of a typical touch screen is usually composed of three parts, two transparent layers of resistive conductor, two layers of conductors between the insulating layer, the electrodes. The resistive conductive layer is selected from resistive materials, such as indium tin oxide (ITO) applied to the substrate, the top layer of the substrate with plastic, the bottom layer of the substrate with glass. The insulating layer is a viscous liquid insulating material, such as mylar film. The electrodes are made of materials with excellent conductivity (for example, silver powder ink), and their conductivity is about 1000 times higher than that of ITO.

When we touch the screen with a finger or other similar object, the two conductive layers installed inside the resistive touch screen instantly come into contact and a series of changes in resistance values occur, while the controller at the other end is able to detect these subtle changes, thus determining the coordinates of the contact point according to certain measurement methods. The disadvantage of a resistive touch screen is that it can only operate once and quickly in response to a touch point, and with too many touch points, the response will be slow. Therefore, based on the characteristics of the resistive screen, we can easily think that the resistive touch screen is only suitable for clicks, swipes and other actions, and in the sun will have some impact on the line of sight.

The working principle of the cell phone capacitive screen: the capacitive screen of the cell phone applies the working principle of human thermal induction, generally can only be touched by fingers and other thermally induced objects. From the physical structure point of view, it has four layers of composite glass screen, the inner surface of the glass screen and the middle layer are covered with a thin layer of ITO, the outermost layer is a protective layer of silicon glass which is hardly seen, and the inner layer of ITO is the screen layer, which ensures the stability of the whole working environment of the capacitive screen. When the touch screen is not touched, the potential of the four display electrodes is the same. However, once the capacitive touch screen is pressed with a finger, a coupling capacitance will be generated between the human electric field, the fingertip and the conductive layer, and the four corner electrodes will radiate current one by one and flow evenly to the contact. The importance of capacitive touchscreens at this level of multi-touch completely exceeds the limits of what resistive displays can do and allows complex movements to be judged effectively.

After reading this article, I think you have a clear understanding of the principle of cell phone touch screen, then when buying a cell phone, or think about which touch screen you need, after all, for us, the phone is inseparable from the hand, so it is better to choose the right for you!