Solar led street lamp quality
How to control and improve the quality of full color LED display? What is the important indicator reflecting the quality of the full color LED display LED? The first LED devices as the most critical components of the full-color LED display for three reasons:
solar led street lamp and quality
First, LED full color machine used in the largest number of devices per square meter will be used only a few thousand to tens of thousands of led lights;
Secondly, LED is to determine the main body of the optical display performance of the entire screen, a direct impact on the evaluation of the audience on the screen;
Again, LED display the overall cost of the proportion of the largest, ranging from 30% to 70%. LED choice determines the quality of more than 50% of the entire display. If not other parts of the good LED, display, even the best can not make up the display quality defects.
Reflect the quality of the full color LED display LED indicators are:
First, the failure rate
The full-color display by the tens of thousands or even hundreds of thousands of clusters of red, green, composed of blue LED pixel composition of any one color of LED failure will affect the display of the overall visual effect. In general, industry experience in the LED display assembly to the aging failure rate in the 72 hours before shipping should be no higher than three ten thousandths (LED device itself causes the failure).
Second, the antistatic ability
LEDs are semiconductor devices sensitive to static electricity can easily cause static failure, antistatic ability is critical to the life of the display. In general, LED¡¯s body static mode test failure voltage should not be less than 2000V.
Third, the attenuation characteristics
Red, green, blue LED bulbs With the increase in working hours, the light attenuation characteristics. The pros and cons of the LED chip, The quality of the auxiliary materials and packaging technology standards determines the level of the decay rate of the LED. In general, the light test of 1000 hours, 20 mA at room temperature, the attenuation of the red LED should be less than 10%, blue, green LED attenuation should be less than 15%. Consistent attenuation of red, green, blue, full-color LED display white balance impact, thereby affecting the display fidelity.
Fourth, the brightness
LED brightness is an important determinant of the brightness of the display. LED brightness higher the margin the greater the current, on the saving power, to keep the LED stability is good. The LED has a different value of the angle, the case of chip brightness has been set, the smaller the angle, LED is more bright, but the smaller the viewing angle. 100 degree LED general should be chosen in order to ensure a sufficient display of perspective. Different spacing and different line of sight of the display brightness, angle, and the price to find a balance.
Full-color display is composed of numerous red, green, blue LED pixel blocks, the brightness of the LED panel of each color, the consistency of the wavelength determines the brightness of the display consistency, white balance, consistency, chroma consistency. In general, the display manufacturers require device suppliers to 5nm in the wavelength range and 1:1.3 brightness range of LEDs, these indicators reach by the device supplier through the color separation machine grading. Voltage consistency is generally not required.