There are black spots on the screen. Is the internal screen broken?

If there are black spots on the screen, it is most likely that the internal screen is broken. The way to judge is to press the black spot with your hand and check whether there is liquid crystal flow. If there is, the screen is damaged; this situation is generally The screen is squeezed, causing the LED circuit inside the screen to be damaged and unable to work properly. It is recommended to go to after-sales service for inspection and repair.

The operating environment of this tutorial: MIUI12.5 system, Xiaomi 11 mobile phone.

There are black spots on the screen. Is the internal screen broken?

It is very likely caused by screen leakage.

First press the black spot with your hand to see if there is liquid crystal flow. If so, the screen is damaged;

In this case, the screen is generally squeezed, resulting in luminescence inside the screen. The triode (transistor) tube circuit is damaged and cannot work properly. It is recommended to go to the after-sales service for inspection and repair. If it is judged to be artificial or not within the warranty period, go to the repair shop to replace a screen yourself or buy a screen module from an online store and replace it yourself. .It is more expensive to replace it. The original one costs several hundred, and the most common one costs more than 100.

LCD is a flat, ultra-thin display device. It consists of a certain number of color or black and white pixels and is placed in front of a light source or reflective surface. LCD displays consume very little power, making them popular among engineers for use in electronic devices that run on batteries. Its main principle is to use current to stimulate liquid crystal molecules to produce points, lines, and surfaces that match the light tube on the back to form a picture.

Disadvantages of LCD monitors

Small viewing angle

The visual deflection angle of early LCD monitors was only 90 degrees, which could only be viewed from the front, and would appear when viewed from the side. Larger brightness and color distortion. The visible deflection angle of LCD monitors currently on the market is generally around 140 degrees, which is enough for personal use, but if several people watch it at the same time, the problem of distortion becomes apparent.

The response time is too slow

The response time is a special indicator of the LCD monitor. The response time of an LCD monitor refers to the speed at which each pixel of the monitor responds to an input signal. If the response time is short, image smearing will not occur when displaying moving images. This is very important when playing games and watching fast-action images. A fast enough response time can ensure the continuity of the picture. At present, the response time of ordinary LCD monitors on the market has made a big breakthrough compared with before, which is generally about 40ms.

Low brightness and contrast

Do you want a flashlight? This joke is about the brightness and contrast of LCD monitors. Since liquid crystal molecules cannot emit light by themselves, LCD displays need to rely on external light sources to assist in emitting light. Generally speaking, 140 lumens per square meter is enough. There is still a gap between the parameter standards of some manufacturers and the actual standards. One thing to note here is that some small-sized LCD monitors were mainly used in notebook computers in the past and used two lights to adjust, so their brightness and contrast were not very good.

Maintenance Problem

LCD "dead pixel" problem. LCD screens are generally made of glass, which is easily broken. In addition, each pixel is very small, which often causes individual pixels to break, commonly known as "bad pixels". This cannot be repaired, and the only option is to replace the entire display. screens, and replacement is often very expensive.

The launch of a new product has its own characteristics that are superior to old products. The advantage of LCD monitor is that it is lightweight, simple and environmentally friendly and eye-friendly. However, because the current LCD products have the above-mentioned defects, they are still unable to meet all the needs of consumers. Under the premise of such product technology, we call on consumers not to blindly follow fashion trends, but to recognize their own needs and product characteristics, and make the most objective and practical choices.

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