How to distinguish the quality of LED display

For a "layman" how to distinguish the quality of LED display screen, he does not fully understand the LED display screen. In general, it is difficult for the user to be convinced by the salesperson's Self Justification sometimes. In the following days, there are several simple ways to identify the quality of full color display screen, hoping to be helpful when you buy full color display screen.

 

The quality of an LED display can be mainly determined from the following aspects:

 

1. flatness

 

The surface flatness of the display screen shall be within ± 1mm, so as to ensure that the display image will not be distorted, and local bulge or concave will lead to dead angle of the visual angle of the display screen. The gap between the box and the box, between the module and the module shall be within 1mm. If the gap is too large, the boundary of the display screen will be obvious and the vision will not be harmonious. The flatness is mainly determined by the production process.

 

2. Brightness and visual angle

 

The brightness of indoor full-color screen shall be more than 800cd / m2, and that of outdoor full-color screen shall be more than 5000cd / m2, so as to ensure the normal operation of the display screen. Otherwise, the displayed image may not be seen clearly due to the low brightness. The brightness of the display is not the better, it should match the brightness of the LED package. Blindly increasing the current and increasing the brightness will cause the led to decrease too fast and the life of the display screen to decline rapidly. The manufacturer can be required to provide parameter report for confirmation. The brightness of the screen is mainly determined by the quality of the LED core.

 

The visual angle refers to the maximum angle between the two sides of the screen that you can see the content of the whole screen. The size of the visual angle directly determines the number of the screen audience, so the larger the better. The viewing angle should be more than 150 degrees. The size of the viewing angle is mainly determined by the encapsulation of the core.

 

Some tricks to teach "layman" how to distinguish the quality of LED display

 

3. White balance effect

 

White balance effect is one of the most important indicators of display screen. In chromatics, when the proportion of red, green and blue primary colors is 1:4.6:0.16, pure white will be displayed. If there is a little deviation in the actual proportion, the deviation of white balance will appear. Generally, it is necessary to pay attention to whether there is blue bias and yellow green bias in white. When it is monochromatic, the smaller the brightness difference and wavelength difference between LEDs, the better the consistency. Stand on the side of the screen to see no color difference or color deviation. The quality of white balance is mainly determined by the brightness wavelength ratio of LED core and the control system of display screen, and the core also has an impact on the color reducibility.

 

4. Color reducibility

 

Color reducibility refers to the reducibility of the display screen to the color. The color displayed on the display screen should be highly consistent with the color of the playback source, so as to ensure the authenticity of the image.

 

5. Whether there are mosaics and dead spots

 

Mosaic refers to the small four squares that are usually bright or black on the display screen, namely the module necrosis phenomenon. The main reason is that the quality of IC or connector used in the display screen is not up to standard Dead point refers to a single point that is always bright or always black on the display screen. The number of dead points is mainly determined by the quality of the tube core and whether the anti-static measures of the manufacturer are perfect.

 

6. Color block or not

 

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

 

7. Display stability

 

Stability refers to the reliable quality of LED display screen in the aging stage after it is finished. It can be determined by aging records from the manufacturer to get the condition of the screen during aging.

 

8. security

 

LED display screen is composed of several boxes. Each box must be provided with external passenger grounding protection, and the grounding resistance shall be less than 0. 1 euro. It can withstand high voltage, 1500V for 1min without breakdown. Warning signs and slogans shall be provided at the high-voltage input terminal and the high-voltage wiring of the power supply.

 

9. Packaging and transportation

 

LED display is a kind of valuable goods, which is very heavy. The packaging method used by manufacturers is very important. Generally, it is packed according to a single box, and each side of the box must be provided with a protective object for buffering, and the internal space of the box is not large during transportation. The outer packing box shall be clearly marked.