Eight effects of direct insertion of LED beads on LED display screens

Time:2018-12-26 Views:44

1, the Angle of view

The Angle of view of LED display screen depends on the Angle of view of direct plug LED lamp bead.Current level is chosen mostly outdoor display screen Angle 100 °, the vertical Angle of 50 ° elliptical LED, indoor display is choose horizontal vertical 120 ° of SMD leds.Display on the highway 30 ° Angle is generally selected due to its particularity of round LED is enough.Some tall buildings on the screen of the vertical Angle of view is higher, the Angle of view and brightness are contradictory to each other, the large Angle of view will inevitably reduce the brightness.The choice of perspective needs to be determined according to the specific purpose.

2, brightness

LED brightness is an important determinant of screen brightness.The higher the LED brightness is, the larger the use current margin is, which is good for saving power and maintaining LED stability.Leds have different Angle values. When the chip brightness is set, the smaller the Angle, the brighter the LED, but the smaller the view Angle of the display screen.Generally, a 100-degree LED should be selected to ensure sufficient viewing Angle of the display screen.For screens with different spacing and line-of-sight, strike a balance between brightness, Angle and price.

3. Failure efficiency

Eight influences of direct insertion LED beads on LED display screen: direct insertion LED beads

Because the full-color display screen is composed of tens of thousands or even hundreds of thousands of pixels composed of red, green and blue leds, the failure of any color LED will affect the overall visual effect of the display screen.Generally speaking, according to industry experience, the failure rate of LED display from assembly to aging 72 hours before shipment should not be higher than 3/10000 (refers to the failure caused by the direct insertion of LED beads themselves).

4. Anti-static ability

LED is a semiconductor device, sensitive to static electricity, easy to cause electrostatic failure, so the anti-static ability of the life of the screen is crucial.Generally speaking, the LED‘s human static mode test failure voltage should not be lower than 2000V.

5, life

The theoretical life of direct-inserted LED beads is 100,000 hours, much longer than the working life of other parts of LED display screen. Therefore, as long as the quality of direct-inserted LED beads is guaranteed, the working current is appropriate, the PCB heat dissipation design is reasonable, and the production process of the display screen is rigorous, the direct-inserted LED beads will be one of the most durable parts of the whole display screen machine.

Direct inserted LED beads account for 70% of the price of LED display screen, so it can determine the quality of LED display screen.China is not only a major manufacturer of LED beads, but also a gathering place of LED display screen manufacturing.The high technical requirements of LED display are the development trend in the future. The high quality requirements of LED display are not only related to the trend of LED display manufacturers, but also related to the development of LED display device manufacturers.From the direct plug LED bead gate, to promote China from the LED screen manufacturing power to the LED screen manufacturing power transformation.

6. Attenuation characteristics

After long working hours, LED screen brightness will decline and the color of the screen is inconsistent, which is mainly caused by the brightness attenuation of the direct plug LED beads.The attenuation of LED brightness will cause the brightness of the whole screen to decrease.Inconsistent brightness attenuation of red, green and blue leds will lead to inconsistent color of LED display screen, which is often referred to as the phenomenon of spent display screen.High quality direct plug LED beads can control the brightness attenuation.According to the standard of lighting 20mA at room temperature of 1000 hours, the red attenuation should be less than 2%, and the blue and green attenuation should be less than 10%. Therefore, the blue and green LED screen design should try not to use 20mA current, and it is best to use only 70% to 80% of the rated current.

In addition to the red, green and blue LED characteristics, attenuation characteristics are related to the use of current, PCB heat dissipation design, the use of environmental temperature display screen, etc., all have an impact on attenuation.

7, size

The size of the directly inserted LED bead affects the pixel distance of the LED display screen, that is, the resolution.The 5mm oval lamp is mainly used for outdoor display screens above P16, the 3mm oval lamp is mainly used for outdoor display screens of P12.5, P12 and P10, the 3528 patch LED is mainly used for indoor display screens of P6 and P8, and the 2020 patch LED is mainly used for indoor display screens such as P2 and P3.Under the premise of constant point spacing, the size of direct-inserted LED beads increases, which can increase the display area and reduce the particle sense. However, the contrast will be reduced due to the decrease of the black area.On the contrary, LED size decreases, reducing display area, increasing particle sense, increasing black area and increasing contrast.

8. Consistency

Full-color display screen is composed of countless red, green and blue LED pixels, each color LED brightness, wavelength consistency determines the brightness consistency of the whole display screen, white balance consistency, chromaticity consistency.Generally speaking, display manufacturers require device suppliers to provide 5nm wavelength range and 1:1.3 brightness range of LED, these indicators can be achieved by device suppliers through the classification of the separators.Voltage consistency is generally not required.

Since LED has Angle, full-color LED display screen also has Angle orientation, that is, when viewed from different angles, its brightness will increase or decrease.In this way, the Angle consistency of red, green and blue leds will seriously affect the consistency of white balance at different angles and directly affect the fidelity of video color on the display screen.In order to achieve the matching consistency of the brightness changes of red, green and blue leds at different angles, the packaging lens design and raw material selection need to be strictly scientific design, which depends on the packaging supplier‘s technical level.No matter how good the normal white balance is in the display screen, if the LED Angle consistency is not good, the white balance effect of different angles of the whole screen will be bad.The Angle consistency of the straight insert LED beads can be measured by the LED Angle comprehensive tester, which is especially important for medium and high-end display screens.