At present, the small-pitch LED display has a huge impact on us. It affects our daily life all the time, because we rely on it too much. Let me introduce you to the small-pitch LED display. Related introduction of the screen.

1. Impact on brightness The brightness of the small-pitch LED display depends on the current flowing into the LED lamp beads and the brightness performance of the LED lamp beads themselves. The higher the current used by the LED lamp beads, the greater the luminous brightness of the small-pitch LED display. The high-quality LED lamp beads have a good light conversion rate, and the very small use current can emit high-brightness light, which is useful for saving energy. It is beneficial to keep the small-pitch LED display stable.

2. Impact on the out-of-control rate Since the small-pitch LED display consists of tens of thousands or even hundreds of thousands of pixels consisting of three 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 of the LED display from the start of assembly to aging 72 hours before shipment should be no more than three ten thousandths (referring to the failure caused by the LED lamp beads itself), high-quality LED lamp beads The failure rate is very low. The out-of-control rate of the entire screen of the small-pitch LED display using high-quality LED lamp beads can be controlled below one hundred thousandth.

3. Impact on the service life The theoretical life of LED lamp beads is 200,000 hours, which is much longer than the working life of other parts of the small-pitch LED display. Therefore, as long as the quality of the LED lamp beads is guaranteed, the working current is appropriate, the PCB heat dissipation design is reasonable, and the display screen The production process is rigorous, and the LED lamp beads will be one of the most durable parts of the display machine. The small-pitch LED display using high-quality LED lamp beads has a service life of up to 100,000 hours and a mean time between failures (MTBF) as high as 50,000 hours.

4. Impact on the pixel pitch The size of the LED lamp beads affects the pixel pitch of the LED display and the resolution of the entire screen. SMD0707 type LED lamp beads are mainly used for small-pitch LED displays below P1.5, SMD1010 type LED lamp beads are mainly used for P1.6, P1.9, P2.0 small-pitch LED displays, and SMD2121 type LED lamp beads are mainly used It is suitable for P2.5, P3 small-pitch LED display. Under the premise that the dot pitch is unchanged, the size of the LED lamp beads can increase, which can increase the display area and reduce the graininess, but the reduction of the black area will reduce the contrast; on the contrary, the reduction of the LED lamp size reduces the display area. The graininess increases, the black area increases, and the contrast increases.

5. Impact on viewing angle The viewing angle of the small-pitch LED display is determined by the viewing angle of the LED lamp beads. At present, indoor display screens mostly use LED lamp beads with ultra-wide viewing angles both horizontally and vertically, so that the horizontal/vertical viewing angle of small-pitch LED displays can reach a viewing angle of 160 degrees.

6. The influence of anti-static ability LED lamp beads are semiconductor devices, which are sensitive to static electricity and can easily cause static failure. Therefore, anti-static ability is very important to the life of the display screen. High-quality LED lamp beads can withstand the test voltage of 60Hz, 3000V (effective value of alternating current) for 1 minute without insulation breakdown. 8. Impact on the attenuation characteristics of LED display screens after a long period of work, the brightness of the display will decrease and the color of the display will be inconsistent, which is mainly caused by the brightness attenuation of the LED lamp beads. The attenuation of the brightness of the LED lamp beads will cause the brightness of the entire screen to decrease. The inconsistency of the brightness attenuation of the red, green, and blue LEDs will cause the color of the LED display to be inconsistent, which is the phenomenon that we often say that the display is spent. High-quality LED lamp beads can well control the brightness attenuation range. According to the standard of 20mA lighting at room temperature for 1000 hours, the red attenuation should be less than 2%, and the blue and green attenuation should be less than 20%. Therefore, the blue and green LED should not use 20mA current when designing the display. It is best to use only 70% to 80 % Of rated current. The attenuation characteristics are not only related to the characteristics of the red, green, and blue LEDs, but also the current used, the heat dissipation design of the PCB board, and the ambient temperature of the display screen.

7. The impact on the consistency of brightness/chromaticity/white balance The small-pitch LED display is composed of countless red, green, and blue LEDs. The brightness and wavelength consistency of each color LED determines the entire The brightness consistency, white balance consistency, and chromaticity consistency of the display screen. Generally speaking, the display manufacturer requires the device supplier to provide LED lamp beads with a wavelength range of 5nm and a brightness range of 1:1.3. These indicators can be achieved by the device supplier through a spectroscopy machine. Since the LED lamp beads are angled, the small-pitch LED display also has angular directionality, that is, when viewed from different angles, its brightness will increase or decrease. In this way, the angle consistency of the red, green, and blue LEDs will seriously affect the consistency of the white balance at different angles, and directly affect the fidelity of the video color of the display screen. To achieve the matching consistency of the brightness changes of the red, green, and blue LEDs at different angles, it is necessary to strictly carry out scientific design in the packaging lens design and raw material selection, which depends on the technical level of the packaging supplier. No matter how good the white balance is in the normal direction, if the angle consistency of the LED lamp beads is not good, the white balance effect of the whole screen at different angles will be bad. The angle consistency characteristics of LED lamp beads can be measured with a comprehensive LED angle tester, which is particularly important for medium and high-end displays.