LED display evaluation, mainly pay attention to the following aspects:
Flatness
The surface flatness of the display should be within ±1mm to ensure that the displayed image is not distorted. Local bumps or recesses may cause a blind angle in the viewing angle of the display. The quality of the flatness is mainly determined by the production process.
2. Brightness and viewing angle
The brightness of the indoor full-color screen should be above 800cd/m2, and the brightness of the outdoor full-color screen should be above 1500 cd/m2 to ensure the normal operation of the display. Otherwise, the displayed image will not be seen because the brightness is too low. The brightness is mainly determined by the quality of the LED die.
The size of the viewing angle directly determines the number of display audiences, so the bigger the better. The size of the viewing angle is primarily determined by the way the die is packaged.
3. White balance effect
The white balance effect is one of the most important indicators of the display. In color theory, when the ratio of the three primary colors of red, green and blue is 1:4.6:0.16, pure white will be displayed. If there is a slight deviation in the actual ratio, the deviation of white balance will occur. Generally, it should be noted whether white is blue or yellow. Green phenomenon. The quality of the white balance is mainly determined by the control system of the display, and the die also has an effect on the color reproduction.
4. Color reduction
The reproducibility of color refers to the reducibility of the display, and the color displayed on the display should be consistent with the color of the source to ensure the realism of the image.
5. Whether there is mosaic or dead point
Mosaic refers to the always-on or often black small four-squares appearing on the display screen. The module is necrotic. The main reason is that the quality of the connectors used in the display is not good.
The dead point refers to a single point that is always bright or often black on the display. The number of dead points is mainly determined by the quality of the die.
6. There are no color blocks
The color block refers to the obvious color difference between adjacent modules, and the color transition is in units of modules. The phenomenon of color block is mainly caused by poor control system, low gray level and low scanning frequency.
Spin Motor,Mini Spin Motor,Washing Machine Spin Motor,Automatic Wash Motor
WUJIANG JINLONG ELECTRIC APPLIANCE CO., LTD , https://www.jinlongmotor.com