LED lamp bead is the largest number of components in LED display, such as small-pitch LED display, the number of 2835 lamp beads per square meter is as high as 360,000, and its performance indicators directly affect the performance and display effect of LED display. .

1, perspective

   The viewing angle of the LED display is determined by the viewing angle of the LED bead. At present, most of the outdoor display screens use a horizontal viewing angle of 100°; a vertical viewing angle of 50°; an elliptical LED, and an indoor display screen that uses a horizontal and vertical 120°; The display on the highway is generally 30° due to its particularity; a circular LED with a viewing angle is sufficient.

2, brightness

   LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the larger the margin of current used, which is beneficial for saving power and keeping the LED stable. LEDs have different angle values. When the brightness of the chip is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, a 100 degree LED should be selected to ensure a sufficient viewing angle of the display. For displays with different dot pitches and different line of sight, a balance should be found in brightness, angle and price.

3, failure rate

    Since the full-color display is composed of tens of thousands or even hundreds of thousands of red, green and blue LEDs, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate before the LED display starts to assemble to 72 hours of aging should be no more than three ten thousandths.

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4, antistatic ability

   LEDs are semiconductor devices that are sensitive to static electricity and can easily cause electrostatic failure. Therefore, antistatic capability is critical to the life of the display. In general, the LED's human body static mode test failure voltage should not be lower than 2000V.

5, life

  The theoretical life of the LED device is 100,000 hours, which is much larger than the working life of other components of the LED display. Therefore, as long as the LED device quality is guaranteed, the working current is suitable, the PCB heat dissipation design is reasonable, and the display production process is rigorous, the LED device will be the display screen. One of the most durable parts in the machine.

6, attenuation characteristics

  When the LED display is operated for a long time, the brightness will drop and the color of the display will be inconsistent, mainly due to the brightness decay of the LED device. Attenuation of the brightness of the LED will cause the brightness of the entire screen of the display to decrease. Inconsistent brightness attenuation of red, green and blue LEDs will cause inconsistencies in the color of the LED display, which is what we often say about the display. High quality LED devices provide excellent control of the brightness attenuation. According to 1000 hours of normal temperature lighting 20mA standard, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LEDs should not use 20mA current in the display design, preferably only 70% to 80% % rated current.