In bustling cities, we can see a variety of full-color LED displays, and even schools, hospitals and banks take advantage of them. It can be seen that the development trend of the full-color LED display industry is becoming more and more important. The better come. There are many LED display manufacturers or dealers on the market, so how do we judge the quality of full-color LED screens? Next, the editor will tell you some related techniques for testing the quality of full-color LED screens. I hope Can help everyone.

The quality of a full-color display screen can mainly be judged from the following aspects:

1. Flatness

The inspection method for full-color LED screens is to look at the screen body specifications, appearance, flatness, connections within the screen, etc. to see if there are any dead pixels after the screen is lit. ) Color difference consistency, whether the display text is normal, display screen pictures, etc. For full color, white, red, green, and blue should be printed on the whole screen.

2.Brightness and viewing angle

Viewing angle refers to the angle from which users can clearly observe all content on the screen from different directions. Viewing angle can also be understood as the maximum or minimum angle at which the screen can be seen clearly. And the viewing angle is a reference value. The viewing angle of the LED full-color display includes two indicators: horizontal and vertical.

Viewing angle: 140°/140°, which means the maximum viewing angle is 140°. The maximum horizontal and vertical viewing angles are 140°. After exceeding 140 degrees, the viewing effect will be poor or there will be a blind spot.

The brightness of the indoor full-color screen must be above 800cd/m2, and the brightness of the outdoor full-color screen must be above 1500cd/m2 to ensure the normal operation of the display. Otherwise, the displayed image will be unclear because the brightness is too low. The brightness is mainly determined by the quality of the LED tube.

3. Is the light uniform?

While observing the brightness, you should pay attention to whether the light of the lamp beads is uniform. When observing the white light, be sure to pay attention to whether there is any color difference (this is very important) - if you cover it with a thin white paper, you may not be able to see it, so Use a certain thickness of acrylic. The presence or absence of color difference is the most important part to distinguish the quality from bad, and it is also one of the main reasons for the price difference of full-color LED screens.

4. White balance effect

White balance effect is one of the most important indicators of the display screen. In terms of color science, pure white will appear when the ratio of the three primary colors of red, green and blue is 1:4.6:0.16. If the actual ratio deviates a little, there will be a deviation in the white balance. Generally, you should pay attention to whether the white color has a bluish or yellowish tinge. green phenomenon. The quality of white balance is mainly determined by the control system of the display screen, and the tube core also affects the color reproduction.

5. Color restoration

Color reproducibility refers to the display's reproducibility of color. Whether the color displayed on the screen is too different from the color projected, making the screen display more realistic.

5. Is there any mosaic or dead center phenomenon?

Mosaic refers to the small squares that appear on the display screen that are always bright or black. It is a phenomenon of module necrosis. The main reason is that the quality of the connectors used in the display screen is not up to standard.

The dead spot refers to a single point that appears on the display screen that is always bright or always black. The number of dead spots is mainly determined by the quality of the die.

6. Is there any color block?

Color block refers to the obvious color difference between adjacent modules. The color transition is based on the module. The color block phenomenon is mainly caused by poor control system, low gray scale and low scanning frequency.

7. Wire identification

High-quality wires have passed UL certification. These are not reliable according to the LED transparent screen manufacturers, so the most direct way is to peel off the outer sheath and count the number of wire cores inside! Use 15, 17, 19 cores or even more than 20 or 30 cores. The module of the wire should be no worse than the module of 14 and 11 cores, and vice versa.

In addition, the quality of LED light sources currently on the market varies greatly. Good-quality LED light sources not only have high brightness, small light attenuation, and strong anti-static capabilities, which determines their long service life, but their prices are lower than cheaper ones. LED light sources are several times higher. The only way out is to choose good quality LED light sources and take effective technical measures to ensure the quality of LED products.