LED lamp beads are the largest number of components in LED display screens. For example, small-pitch LED display screens have as many as 360,000 LED lamp beads per square meter. Various performance indicators directly affect the performance and display effect of LED display screens. .

1. Perspective

     The viewing angle of the LED display depends on the viewing angle of the LED lamp beads. At present, most outdoor display screens use elliptical LEDs with a horizontal viewing angle of 100°; and a vertical viewing angle of 50°; and indoor display screens use SMD LEDs with both horizontal and vertical angles of 120°. The display screen on the highway generally chooses 30° due to its particularity; the circular LED with the viewing angle is enough.

2. Brightness

    LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the greater the margin of the current used, which is good for saving power consumption 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 viewing distances, a balance point 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 pixels composed of three types 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 should not be higher than 3/10,000 when the LED display starts to be assembled and aged for 72 hours before shipment.