The difference between resistive screen and capacitive screen

The difference between resistive screens and capacitive screens

The emergence of resistive screens was a hit among domestic large-screen copycat phones. It can be said to be the standard configuration of copycat phones at that time. With the emergence of high-end capacitive screen products such as Apple's iPhone, resistive screens have lost their competitiveness and are gradually being left out of favor. Let’s introduce the difference between resistive screen and capacitive screen. And by the way, I will introduce some knowledge about resistive screens and capacitive screens.

1. From a technical perspective, capacitive screen technology was applied later than resistive screens. Capacitive screen technology is relatively high-end. In layman's terms, capacitive screens are more expensive than resistive screens. So this is the first difference between them. Many times I see tablets with amazing prices ranging from a few hundred to a few thousand, but the configurations are not much different. Part of the problem is caused by the screen difference. Below is the circuit diagram of the resistive screen.

　2. There are differences in the operation methods. It is common for people to tell jokes that a stylus fell out after buying an iPhone. The connotation is that the stylus is a resistive screen. The resistive screen is a pressure-sensitive operation method. As long as any object causes bending on the screen surface, it can be sensed. The working principle of the capacitive screen is different. When the user touches the capacitive screen, the human body electric field of the user's finger and the working surface form a coupling capacitor. Because the working surface is connected to a high-frequency signal, the finger absorbs a very small current, and the current flows separately. It flows out from the electrodes at the four corners of the screen, and theoretically the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position through precise calculation of the ratio of the four currents. Therefore, the capacitive screen is operated by human touch and does not require pressing. The picture below shows the working principle of capacitive screen.

3. Surface hardness. Because the surface of the resistive screen has a low hardness, it feels soft when painted, while the outermost layer of the capacitive screen is usually smooth and hard. Difference.

4. Then there are surface scratches. In fact, for high-quality capacitive screens, the film is just to prevent fingerprints from being imprinted on it, and the film does not need to be filmed during use. But resistive screens are generally Film protection is required because the screen itself is relatively fragile and will easily break and get scratched without film protection.

　5. Response speed. I have tried cutting fruit with a copycat machine or a tablet with a resistive screen. Friends, you must know that the response speed is a bit slow. The response speed of high-end capacitive screens is only a few milliseconds. 6. Multi-point control, although not all capacitive screens are multi-point control. There is also a conclusion that not all single-electronic controls are resistive screens., but multi-point control is basically a capacitive screen. Multi-point control technology makes the operation of the capacitive screen more convenient and casual. This is also one of the great advantages.

7. Finally, let’s compare the universality of applications. Resistive screens were once very popular on copycat phones. With the disappearance of copycat phones, resistive screens are now only used in low-end tablet computers. Capacitive screens are divided into different grades and are used on mobile phones and tablets of all grades. So now capacitive screens are more mainstream.