A: Resistance technology touch screen
The main part of the resistive touch screen is a resistive film screen that is very compatible with the surface of the display. It is a multi-layer composite film with a layer of glass or hard plastic as the base layer. The surface has a transparent oxidized metal (ITO indium oxide). , transparent conductive resistor) conductive layer, covered with a layer of external surface hardened, smooth anti-scratch plastic layer, its inner surface is also coated with an ITO coating, there are many small between them (less than 1 A 1000 inch) transparent isolation point separates the two conductive layers from each other. When the finger touches the screen, the two conductive layers have contact at the touch point position, and the controller detects the contact and calculates the position of (X, Y), and then operates according to the simulated mouse. This is the most basic principle of the resistive touch screen.
Since the resistance screen entered the market, it has occupied a large market with stable quality, high quality and high adaptability to the environment. Especially in the field of industrial control, due to the high requirements of its environment and conditions, it shows the uniqueness of the resistive screen, making its products account for 90% of the market in similar touch products, and has become the mainstream product in the market. Its biggest feature is not afraid of oil, dust, water.
G-Touch's latest fourth-generation resistive technology touch screen differs from other resistive screen products in that it uses a glass-based board to provide higher light transmittance and a reflective refractive index that is more suitable for the user. At the same time, uniformly coating the conductive layer on the bottom layer of the glass plate to unload the electrostatic particles adsorbed on the touch screen through the ground wire, thereby ensuring that the touch positioning is more accurate and sensitive, completely eliminating the drift phenomenon caused by excessive charged particles, and the positioning is not accurate. The reaction rate is slow, it makes it last longer (physical measurement can be used continuously for more than 15 years), and it has the maintenance-free ability and the scratch resistance is greatly improved. It is indeed a product of excellent quality and reasonable price.
B: Capacitive technology touch screen
Work with the body's current sensing. When the user touches the screen, due to the human body electric field, the user and the surface of the touch screen form a coupling capacitor. For high-frequency current, the capacitor is a direct conductor, so the finger sucks a small current from the contact point. This current is discharged from the electrodes on the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the position of the touch point by accurately calculating the ratio of the four currents.