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The full-color LED display is a kind of LED display screen with clear picture, uniform color and high brightness. The LED with ultra-high brightness is clearly visible from a long distance. The quality of a full-color display can be mainly signed from the following aspects:
Flatness
The flatness of the surface of the LED display should be within ±1mm to ensure that the display image does not distort, and the local bulge or indentation can cause a blind angle in the viewing angle of the display. The flatness is mainly determined by the production process.
2. Brightness and viewing angle
The brightness of indoor full-color screen should be above 800cd/m2, and the brightness of outdoor full-color screen should be above 1500cd/m2 to ensure the normal operation of the display screen. Otherwise, the displayed image could not be seen because the brightness is too low. The brightness is mainly determined by the quality of the LED lamp beads.
The size of the viewing angle directly determines the number of LED display audiences, so the bigger the better. The size of the viewing angle is mainly determined by the packaging method of the die.
3. White balance effect
White balance effect is one of the most important indicators of LED display. In color science, when the ratio of the three primary colors of red, green, and blue is 1:4.6:0.16, pure white color will be displayed. If the actual proportion is slightly different, there will be a white balance deviation. Generally, it should be noted whether the white color is bluish or yellowish. Green phenomenon. The quality of the white balance is mainly determined by the control system of the LED display, and the lamp beads also affect the reproducibility of the color.
4. Reducibility of color
The reduction of color refers to the reduction of the color of the LED display screen, and the color of the display screen of the LED display must be highly consistent with the color of the playback source, so as to ensure the realism of the image. [1]
5. Product design
There are various kinds of full-color LED displays, indoor and outdoor energy-saving highlighting, high refreshing portable products, and so on. All industries have different requirements for LED display screens. Therefore, buyers distinguish LED display screens and select LED display screens. To collect their own needs, manufacturers LED display products can meet their needs to the maximum extent.
6. Material Control
The selection of materials plays a decisive role in the quality of the products. The selection of high-quality raw materials controls the quality of the LED display at the source. So for the buyer as a focus of investigation.
1, LED lights high-grade on behalf of Japan Kerui (chip packaging) mid-range wafer light Lei Silan (chips), LED lights related to the LED industry chain, in particular, involves more packaging industry in the country, the same crystal Silan The quality of the LED chips due to the different packaging manufacturers is unclear, and the middle and high product LED lamp packaging tubes are represented by Yiguang (Taiwan) National Star Lehman.
2. LED Driver IC: As the leading manufacturer of LED drivers worldwide, Accumulation Technology has been the world's number one LED display driver for many years, and has achieved 60% of domestic LED display screens and 50% of global market share. 5024 is the choice of high-end LED display products.
3, power seat (reinforced): power supply is to accept the power line and PCB board connected to the main device, although not the main aspect of determining the quality of LED display, but
Its robustness, electrical conductivity, etc. also affect the life and protection level of the display screen.
4, row needle (with simple horns): row pin is connected to the control system and PCB board control circuit through the main components of the main components, preferably with horns pin, not only make
Screen to prevent the re-work caused by reversal of the cable, but also can effectively prevent the pin exposed screen and maintenance personnel.
5, resistors, capacitors and other components: As the saying goes, there is no limit, because the LED display often switch, the quality of the capacitor also affects the switch when the display
Screen body protection, resistance is the main component of the control of the display screen current, there are preferred Dachang brand products.
6, LED module mask and bottom shell: The main material is plastic. Import high-quality materials, anti-deformation, strong ability to withstand the environment.
7. Production process
LED display belongs to the application industry, unlike the chip LED lamp belongs to the upper and middle reaches of the industry requires a lot of advanced equipment and high-demand production environment, so the production process mainly inspects its production environment, equipment types and brands and other details (do not think the more equipment More is better.)