A few coups to identify the quality of LED display
For a "outer" how to distinguish the quality of the led display, he is not fully aware of the led display, in general, all the sales staff said that it is sometimes difficult to convince users, the following days to identify the full color The easy way to display the quality of the display, I hope to be helpful when you buy a full color display.
The quality of a led display can be signed from the following aspects:
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. Between the box and the box, the gap between the module and the module should be within 1mm. If the gap is too large, the boundary of the display will be obvious and the vision will be uncoordinated. 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 5000cd/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 of the display is not as bright as possible and should match the brightness of the LED package. Simply increasing the current and increasing the brightness will cause the LED to be reduced too quickly and the display life will drop rapidly. The manufacturer may be required to provide a parameter report to confirm. The brightness of the screen is mainly determined by the quality of the LED die.
The viewing angle refers to the maximum angle between the two screens that you can see from the screen. The size of the viewing angle directly determines the number of display audiences, so the bigger the better. The viewing angle should be above 150 degrees. The size of the viewing angle is primarily determined by the way the die is packaged.
A few wonderful tricks to teach "outsiders" how to distinguish the quality of led display
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. In monochrome, the difference between the brightness and the wavelength difference between LEDs is as small as possible. Standing on the side of the screen to observe no color difference or color cast, the consistency is better. The quality of the white balance is mainly determined by the brightness ratio of the LED die and the control system of the display. The die also has an effect on the color reproduction.
4. Color reduction
The reproducibility of color refers to the reducibility of the display screen. 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 small four-square block that appears on the display or is always black. The module is necrotic. The main reason is that the quality of the IC or connector 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 and whether the manufacturer's anti-static measures are perfect.
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.
7. Display stability
Stability refers to the reliable quality of the LED display screen in the aging stage after the finished product is finished. It can be determined by the manufacturer to aging records to determine the number of conditions that occur during the aging of the screen.
The led display is composed of multiple boxes, each of which must be protected by external grounding. The grounding resistance should be less than 0.1 ohm. And can withstand high pressure, 1500V 1min does not breakdown. Warning signs and slogans are required at the high voltage input and at the high voltage wiring of the power supply.
9. Packaging and transportation
The led display is a valuable cargo with a large weight and the packaging method used by the manufacturer is very important. Generally, it is packaged according to a single box. The sides of the box must have a protective material to cushion the space, and the internal space of the box is not large during transportation. The outer box must be clearly marked.
Contact Person: Mr. Anheer Melton
Tel: +86 18680320324