What Is The Difference Between TFT Resistive Touchscreen And TFT Capacitive Touchscreen?

What is the difference between TFT resistive touchscreen and TFT capacitive touchscreen?

TFT resistive touch screen and TFT capacitive touch screen, their TFT is the mean the lcd tft display, so the different is the touch screen. one is capacitive touch screen ,and the other one is resistive touch screen.

Resistive touch screen: Resistive touch screen commonly known as soft touch screen,it is divided into three layers in structure.the inner layer is glass, the outer layer is thin film and the adjacent side of thin film and glass i coated with ITO( Indium Tin Metal Oxide).Resistive touch screen can be divided into 4 wire,5 wire,7 wire or 8 wire touch screen.but how does resistive touch screen panel work?Actually,the resisitive touch screen is a sensor.When the resistive touch screen is operated,two layers of film and glass will collide with each other, and the current will have an impact.The chip will evaluate which position of touch screen is under pressure based on the data between the calculated force for the current and react. It is also because the resistive touch screen is force touch, so it causes the resistive touch screen only just can support one touch only just can support one touch points.It is difficult to achieve multi touch points. And it also make resistive touch screen mostly used in harsh industrial environment where there is a lot of dust, large temperature differences and operation with gloves.

Capacitive touch screen: The capacitive touch screen is a four-layer composite glass screen. The inner surface and the inter layer of the glass screen are each coated with a layer of ITO. The outermost layer is a thin layer of silica glass protective layer. The inter layer ITO coating is used as the working surface, and the four corners are led out Four electrodes, the inner layer of ITO is a shielding layer to ensure a good working environment. When a finger touches the metal layer, due to the electric field of the human body, a coupling capacitor is formed between the user and the surface of the touch screen. For high-frequency current, the capacitor is a direct conductor, so the finger draws a small current from the contact point. This current flows from the electrodes on the four corners of the touch screen, and the current flowing through these 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 these four currents.