The surface flatness of LED display screen shall be within ± 1mm to ensure that the display image is not distorted, and local bulge or depression will cause dead angle of view angle of display screen.
The shape of the plate is mainly determined by the production process.
2. Brightness and viewing angle.
The brightness of indoor full-color screen shall be greater than 800cd / m2, and the brightness of outdoor full-color screen shall be greater than 1500cd / m2 to ensure the normal operation of the display screen, otherwise, because of the low brightness, the displayed image will not be clear.
The brightness is mainly determined by the quality of LED lamp beads.
The size of perspective directly determines the number of audiences of LED display, so the larger the better. The size of the viewing angle is mainly determined by the packing method of the tube core.
Three. White balance effect.
White balance effect is one of the important indexes of LED display.
In chromaticity, when the ratio of red, green and blue primary colors is 1:4.6:0.16, it shows pure white.
If there is a slight deviation in the actual proportion, there will be a white balance deviation.
Generally speaking, we should pay attention to whether white has blue bias and yellow green bias.
The quality of white balance is mainly determined by the control system of LED display, and the lamp beads will also have an impact on the color restoration.
Four. Color reducibility.
Color reducibility refers to the reducibility of LED display to color.
The color displayed on the LED display shall be highly consistent with that of the playback source to ensure the authenticity of the image.
5. Product design.
There are many kinds of full-color LED display, such as indoor and outdoor energy-saving, high brightness, high refresh, portable and other products,
All walks of life have different requirements for LED display,
So when the buyer distinguishes the quality of LED display and selects LED display,
They should collect their own needs and whether the manufacturer's LED display products can meet their own needs.
6. Material control.
The choice of materials plays a decisive role in the quality of LED display.
Select high quality raw materials to control the quality of LED display from the source.
Therefore, it is the focus of the buyer's inspection.
1) the high-end LED lamp represents the intermediate crystal lamp of Nichia Kerui (chip package).
LED lamps and lanterns are related to the intermediate industrial chain of LED, especially the domestic packaging industry.
Similarly, due to different packaging manufacturers, the quality of LED crystal light chip is not clear.
Yuguang (Taiwan) Guoxing Lehman is the middle and high-end product representative of high-end LED light packaging tube.
2) led driver IC: as the world's leading LED driver manufacturer, Jiji technology has been ranked first in the field of LED display driver for many years,
The share of LED display driver in China has exceeded 60%,
More than 50% of the global market share of 5024 is the first choice of high-end LED display products.
3) power base (reinforced): the power base is the main equipment connecting the power line and PCB board.
Although it is not the main aspect that determines the quality of LED display,
But its strong durability and conductivity also affect the service life and protection level of the display screen.
4) needle arrangement (with simple horn): needle arrangement is the main part of control system and PCB control circuit, which is connected by needle arrangement.
Priority should be given to needle arrangement with horn, which can not only prevent rework caused by reverse insertion of needle arrangement,
It can also effectively prevent the exposed damage to the screen and maintenance personnel.
5) resistance, capacitance and other components: as the saying goes, there is not too large or too small.
Because LED display often switches, the quality of capacitance will also affect the protection of display when switching.
Resistance is the main component to control the current of the display screen, and it has the first choice of large brand products.
6) led module mask and bottom shell: the main material is plastic.
Imported high quality materials, anti deformation, strong environmental protection.