How to judge the quality of LED lamp / bulbs beads?
Full-color LED display as a display device is widely used in different occasions to display information. Such as railway stations, airports, movie theaters, shopping malls, etc. where lives are everywhere a variety of full-color LED screen, rolling broadcast a variety of text, images, animations, quotes, etc. information. Widely used not only depend on the LED screen information display itself, but also because of its own advantages. Compared to the current large variety of display devices, high-brightness LED screen, low voltage, low power consumption, large-scale, long life, impact resistance and stable performance, with a broader development prospects.
In the display module LED display, LED lamp beads as the most critical component, the quality is good or bad quality LED display plays a decisive role. There are three reasons: First, LED lights use up to the number of beads in the LED display, per square meter may have thousands or even tens of thousands of LED lights beads; Second, LED lamp beads directly determines the performance of LED display and color saturation, sharpness; three, LED lamp beads in the overall cost of the entire LED display a larger proportion of its quality directly affects the quality of the display.
Thus, LED lamp beads for the whole of the importance of full-color display. How to determine the quality of LED lamp beads, you can refer to the following aspects:
LED lamp beads directly determines the brightness of the LED display brightness. General LED lamp brightness is higher, the greater its current work, we require certain work under the current conditions, the brightness of the light, the brighter the better beads.
Since the LED display is made of thousands or even hundreds of thousands of groups of red, green, and blue LED lamp beads. Failure of any one lamp beads will affect the entire display screen. General industry experience, LED display assembly to begin the aging 72 hours before shipment failure rate should not be higher than ten thousandths.
With increasing brightness LED lamp usage time will slowly decay. Decay rate and the LED chip, auxiliary materials, packaging technology brightness LED lamp beads have a certain relevance. In general, 1000 hours, 20 mA at room temperature after lighting tests, the red LED lamp beads attenuation should be less than 7%, blue, green LED lamp beads attenuation should be less than 10%. Red, green, blue attenuation consistency full-color LED display great balance affect the future, and thus influence the display of the display fidelity.
Four, LED display antistatic ability
Since LED lamp beads are semiconductor devices sensitive to static electricity, static electricity can easily lead to failure, it is essential antistatic ability of the LED display life. LED lamp beads antistatic ability is stronger, the longer its life. Generally speaking, LED lamp beads body static test failure mode voltage should not fall below 2000V.