What is the difference between capacitive touch screen and resistive touch screen?
Before the capacitive touch screen came out, that is, before 2010, the resistive touch screen was the most used sensing screen at that time, also known as: pressure sensitive or analog resistive film type touch panel. At that time, this touch technology was widely used, and now resistive touch screens are still in use in the industrial field. From a technical point of view, the application time of capacitive screen technology is later than that of resistive screen. Capacitive screen technology is relatively high-end. In popular words, capacitive screens are more expensive than resistive screens. So this is the first difference between them. So what is the difference between them, let us find out today.
Resistive screen: The full name is resistive touch screen, commonly known as "soft screen".Resistive touch screens are more likely to damage the touch parts of the screen due to scratches. It is divided into three layers in structure. The inner layer is glass and the outer layer is a thin film. The adjacent sides of the thin film and the glass are coated with ITO (Indium Tin Metal Oxide). Resistive screens can be divided into four-wire, five-wire, seven-wire or eight-wire touch screens. The difference between these categories is the difference in the bias voltage of the screen. The application of the resistive touch screen in the touch all-in-one machine, due to its one-point touch technology principle, makes the machine touch more accurate. At the same time, in the pixel configuration, it can support HDMI 4K video and video transcoding, and the display effect is more high-definition.
Working principle: Simply put, the resistive screen is actually a kind of sensor. When the resistive screen is operated, when the two layers of film and glass collide with each other, the current will have an impact. The chip evaluates which position of the screen is pressed and reacts based on the data between the calculated force and the current. It is also because the resistive screen is a force touch, so this principle causes the resistive screen to only touch one point, and it is difficult to achieve multi-point touch. This principle also makes resistive screens mostly used in harsh industrial use scenes where there is a lot of dust, large temperature differences, and operation with gloves.
Capacitive screen: The full name is capacitive touch screen, commonly known as "hard screen". It is a four-layer composite glass screen. The first layer is ITO to ensure the working environment, the second layer is glass, and the third layer is also ITO coating. Used as a working surface; the fourth layer is a protective layer of silica glass. Many well-known, the main feature of the capacitive touch screen is that it can realize multi-point touch.
Working principle: Capacitive screens actually use human body current sensing to work, which can be understood as the need to touch the medium with bioelectricity to touch. In other words, the capacitive screen uses the lower layer to transmit signals to the upper layer. When the upper layer is contacted by the conductor, the lower layer can quickly receive the information and make calculations. Determine where the finger touches and react. It is precisely because of this that the capacitive screen can not only support multiple points at the same time, but also greatly improves the sensitivity of hand touch.
Advantages of capacitive screen：
1. The capacitive touch screen only needs touch, not pressure to generate signals.
2. The capacitive touch screen only needs one time or no calibration at all after production, while the resistive technology requires regular calibration.
3. The life of the capacitive solution will be longer, because the components in the capacitive touch screen do not need any movement. In resistive touch screens, the upper ITO film needs to be thin enough to be flexible so that it can bend downward to contact the lower ITO film.
4. Capacitance technology is superior to resistance technology in terms of light loss and system power consumption.
5. The choice between capacitive technology or resistive technology mainly depends on the object that touches the screen. If it is touched by a finger, a capacitive touch screen is a better choice. In addition, the industrial capacitive touch screen supports touch with water (waterproof), touch with gloves, touch with thick cover (explosion-proof), etc. If you need a stylus, whether it is plastic or metal, a resistive touch screen can do the job. The capacitive touch screen can also use a stylus, but it needs a special stylus to cooperate.
6. Surface capacitive (infrared screen) can be used for large-size touch screens, and the cost is low, but it cannot support gesture recognition nowadays:Projected capacitive touch screen is mainly used for small and medium-sized touch screens, and can support gesture recognition (the maximum size supports 100 inches , Low production volume and high price).
7. Capacitive technology is wear-resistant, has a long life, and has low maintenance costs when users use it. Therefore, the overall operating cost of the manufacturer can be further reduced.
8. Capacitive touch screens can support multi-touch technology, and unlike resistive touch screens, the response is slow and not easy to wear.
