What should I do if the touch screen of the smartphone is out of order?

There are resistive and capacitive touch screens, which are introduced separately.

A resistive touch screen is a sensor that converts the physical position of a touch point (x,y) in a rectangular area into a voltage that represents the x and y coordinates. Many LCD modules use resistive touch screens that can be used with four, five, seven, or eight wires to generate the screen bias voltage and read back the voltage of the touch point. The resistive touch screen is basically a thin film and glass structure, and the adjacent side of the film and glass is coated with ITO (nano-indium tin metal oxide) coating, and ITO has good conductivity and transparency.

When the touch operation, the ITO of the lower layer of the film will contact the ITO of the upper layer of the glass, and the corresponding electrical signal will be transmitted through the sensor, which will be sent to the processor through the conversion circuit, and converted into the X and Y values on the screen through calculation, and the selected action will be completed and presented on the screen.

A capacitive touch screen is a layer of transparent special metal conductive substance attached to the surface of glass. When a finger touches a metal layer, the capacitance of the contact changes, causing the frequency of the oscillator connected to it to change to change, and information can be obtained by measuring the frequency change to determine the touch position.

Now the resistive type is gradually eliminated, and it is basically capacitive, and the positioning is accurate.

Capacitive touch screens are plated with narrow electrodes on all four sides of the touch screen to form a low-voltage alternating current field in the conductive body. When touching the screen, due to the electric field of the human body, a coupling capacitance will be formed between the finger and the conductor layer, and the current emitted by the four electrodes will flow to the contact, and the current strength is proportional to the distance from the finger to the electrode, and the controller behind the touch screen will calculate the proportion and strength of the current to accurately calculate the position of the touch point. The double glass of the capacitive touch screen not only protects the conductor and sensor, but also prevents external environmental factors from affecting the touch screen, even if the screen is stained with dirt, dust or oil, the capacitive touch screen can still accurately calculate the touch position.

If you are using a Huawei phone and the touch screen is out of order, you can troubleshoot it by following the following steps:

1.If the screen has a film, it may be due to the protective film being too thick, which affects the touch sensitivity of the screen. We recommend that you replace a thinner third-party protective film or go to a Huawei Customer Service Center to replace an official protective film.

2.If your phone's screen is dirty or has water stains, it may affect the screen touch sensitivity. It is recommended that you try it after wiping your screen clean.

3.If your device is in normal use, if you suddenly have no response or freeze when clicking on part or the entire screen, please press the power button and volume up button at the same time to start the screen recording function, and then click the screen operation, if there is a white point on the screen moving with your fingers, it means that the touch screen is working normally.

4.If the screen does not respond, please press and hold the "power button" for more than 10s, and try to force restart the device.

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Causes

1. If the touch screen of the screen just changed is not working, it is very likely that the screen has not been replaced, and you can find the professional who changed the screen before to detect it again;

2. If the screen is used for a period of time after replacing the screen, it is likely that the screen accidentally fell and caused the screen cable to loosen, so it should be sent to the after-sales service for testing;

Classification

According to the material of the screen, the mainstream screens of smartphones can be divided into two categories, one is LCD (abbreviation of Liquid Crystal Display), that is, liquid crystal displays, such as TFT and SLCD screens.

The other is OLED (Organic Light-Emitting Diode), that is, organic light-emitting diodes, such as AMOLED series screens. The most fundamental difference between LCD and OLED is that OLED is self-illuminating, while LCD needs to be illuminated by a backlight plate to display.

According to the display technology driving mode of the screen, it can be divided into two categories: passive matrix and active matrix. The difference between passive matrices and active matrices is the way the current is driven.

When the external current is outdated, the arrangement of the liquid crystal will change, and after the current stops, if the liquid crystal arrangement remains in place (with memory), it is called the active matrix; Once the current disappears, it returns to its original position and must be charged again to be arranged, which is called a passive matrix.

First, the system of restarting the old mobile phone in the early years is written inside the mobile phone, which is very different from the current smart phone, and the biggest difference between the old mobile phone and the smart phone is that the smart phone will crash.

If you find that the touch screen of the smartphone is out of order, the phone has not been dropped and there is no water, and the screen of the mobile phone is intact, it is not necessarily that the touch screen is damaged, it may be that the smartphone is dead, press and hold the power off button for 3 5 seconds, the phone will be forced to power on, and the touch screen will automatically recover after turning on.

Second, hardware problems, the mobile phone has been heavy before, squeezing, or water and other man-made damage, most of the touch screen problems, many Huawei mobile phones, Xiaomi mobile phones, Apple hand Sun chain bird machine touch does not work or all of the failure, you need to go to a professional maintenance point to replace the touch screen can be solved, of course, there are some water inlet machine is a problem on the motherboard, such as touch IC problems, you can take it to a professional maintenance point to let the master check it for you.

3. Wiring problemIf the mobile phone has been injured before the touch screen has a problem, it may be that the mobile phone has been injured and the wiring of the touch screen is not in good contact.

Although the internal parts of the mobile phone are relatively compact, and the internal injuries are not visible on the appearance of the mobile phone, there is still a chance that the cable will loosen due to falls and vibrations.

If the touch screen of the phone is still not working after trying to restart the phone and reinstall the cable, you can only find a professional mobile phone repair shop to test it and ask it to help repair it.

In the event of mobile phone screen failure, first of all, we need to clean the mobile phone screen, and the static electricity of the mobile phone screen may also cause the touch screen to fail, so you only need to gently wipe the entire screen with your hands. Or you can try to remove the protective film to clean the screen.

After finding that the phone's touch screen is not working, we can also try to press the lock screen button back and forth a few more times. In many cases, the phone's touch screen fails because of a slow response caused by software conflicts or incompatibilities, so it is possible to recover by pressing the lock screen button back and forth a few times.

For more serious cases, you can try by turning off the phone, then waiting for a few minutes before turning it on. Or remove all the memory cards and ** cards of the mobile phone, wait for a few minutes and then install them before trying.

In addition, there is a situation that is encountered by friends who often use beautification, this situation may be caused by the incompatibility of various beautification software and the system, and the solution is also very simple, generally uninstalling beautification software similar to the theme can be solved.

If you can't troubleshoot the problem through the above, you will have to restore it to factory settings. First, use a PC suite to back up the contents on your phone. Before paying attention to the soft grid, take out the memory card first, otherwise it will be formatted together, and the contents of the card will be completely deleted!

If this persists, try flashing your device again.

After flashing, if such a situation still exists, it is a hardware failure, and then you need to find after-sales service, or return to the factory for maintenance.

It is not normal, and the possibilities are mainly the following.

1.If the system firmware is faulty, it is recommended to reflash the system to rule out software factors.

2.The touch screen itself is faulty, and this needs to be sent for repair.

3.The cable connection between the touch screen and the motherboard is not in good contact, you can do it yourself, if the hands-on ability is not strong, you can only send it for repair.

Occasionally it's normal.,If it's not normal often.,Maybe there's something wrong with the system or hardware.,Change a touch screen 15 30 yuan,

The capacitive screen will also fail if there are too many water stains on the screen.