Influence of Nationstar led on full color LED display screen quality.

LED lamp Nationstar led, as the most expensive and most consumed components of LED display, play a leading role in the quality of LED display. Today, we will introduce why led beads are the most important part of LED display screen. How to distinguish the advntages and disadvantages of LED beads?

The most important part of full color LED display is led beads.

There are three reasons for nbsp; &nbsp

First, LED is the most important device with the most full color screen, with thousands of LEDs per square meter.

Másodszor, LED is the main body that determines the optical display performance of the whole display screen, which directly affects the audience’s evaluation of the display.

Moreover, led accounts for the largest proportion of the total cost of display, ranging from 30% to 70%.

How to identify the quality of LED display lamp beads

First, look at the solder joints. The LED strip produced by the regular LED strip manufacturer is SMT patch process, which is produced by solder paste and reflow welding process

Second, look at the quality of FPC. FPC copper and calendered copper are two types. The copper plate on the copper foil is protruding, and it can be seen more carefully from the welding pad and FPC joint

Third, look at the cleanliness of the LED strip surface. If the LED strip is produced by SMT process, the surface cleanliness is very good, and no impurities and stains will be seen

If you aging some equipment manufacturers have a huge amount of regular aging for 24 hours or longer, you can measure the brightness of LED again. It is the best to see the attenuation of LED luminous intensity and the minimum damping quality.

What is the effect of LED beads on LED display

1. Perspective

The view of the LED display depends on the angle of view of the LED beads. Currently, most outdoor displays have a horizontal view of 100 °. , the vertical angle is 50 °; the horizontal vertical of the elliptical led and indoor display is 120 °. It’s patched. Because of its particularity, the display screen on highway is generally 30 °; circular led with angle of view is enough. Some high-rise buildings require more vertical view. The angle of view and brightness are contradictory, and the large angle of view will inevitably reduce the brightness. The choice of perspective depends on a specific purpose.

2. Fényerősség

LED brightness is an important factor to determine the brightness of the display. The higher the brightness of LED, the greater the residual of current, it is conducive to saving power consumption and maintaining the stability of LED. LED has different angle values. When the brightness of the chip is set, the smaller the angle is, the brighter the LED is, but the smaller the angle of view of the display screen is. Általában, 100 degree LED is selected to ensure that the display screen has enough view angle. For screens of different distances and different views, there should be a balance between brightness, angle and price.

3. Inefficiency

Because the full color LED display is composed of tens of thousands or even hundreds of thousands of pixels red, green and blue LED, the failure of any color LED will affect the visual effect of the whole display. Általában véve, according to industry experience, the failure rate of LED display before assembly shall not exceed 3/10000, and aging 72 hours before delivery (refers to the failure caused by LED lamp bead itself)

4. Antistatic capacity

LED is a semiconductor device, sensitive to static electricity and easy to cause static electricity failure. Ebből adódóan, the antistatic ability is very important for the life of the display screen. Általában véve, the fault voltage of LED body electrostatic mode test shall not be less than 2000V.

5. Life

The theoretical life of LED device is 100000 órák, which is far beyond the working life of other parts of LED display. Ebből adódóan, as long as the quality of LED devices, the working current is appropriate, the PCB heat dissipation design is reasonable, the production process of the display screen is rigorous, LED devices will be one of the most durable parts of the display screen.

LED equipment accounts for 70% of the price of LED display, so LED equipment can determine the quality of LED display. China is the world’s leading LED device manufacturing country, and also the gathering place of LED display. The high-tech requirements for LED display are the future development trend. The high quality requirements of LED display screen not only relate to the development trend of LED display manufacturers, but also to the development of LED display equipment manufacturers. From LED devices, China has been promoted to transform from leading LED display manufacturers to leading LED display manufacturers.

6. Attenuation characteristics

LED display will appear brightness drop and display color inconsistency after long-term operation, mainly due to the brightness attenuation of LED equipment. The attenuation of LED brightness will reduce the brightness of the entire display. The inconsistency of brightness attenuation amplitude of red, green and blue LED will lead to the inconsistency of LED display color, which is the phenomenon that we often call display cost. High quality LED devices can control brightness attenuation. According to the standard of 20mA 1000 hours lighting at room temperature, the red attenuation is less than 2%, and the attenuation of blue and green is less than 10%. Ebből adódóan, the blue green LED should not use 20mA current when designing the display screen, and it is better to use only 70% to 80% of the rated current.

In addition to the characteristics of red, green and blue LED, the attenuation characteristics are affected by current, PCB heat dissipation design and display screen environment temperature.

7. Dimensions

The size of LED device affects the pixel distance of LED display screen, that is, the resolution. 5mm oval lamp is mainly used for outdoor display screen above p16; 3mm oval lamp is mainly used for outdoor display screen of p12.5, p12 and P10; 3528 SMD LED is mainly used for P6 and P8 indoor display; 2020 SMD LED is mainly used for P2, P3 and other indoor display screens. On the premise of the same point spacing, the increase of LED device size can increase the display area and reduce the graininess. azonban, due to the decrease of black area area, the contrast will be reduced; ellenkezőleg, the LED size decreases, the display area is reduced, the graininess sense is increased, and the black area area is increased, which increases the contrast.

Due to the different angles of LED, the full-color LED display also has the angle direction, 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 red, green and blue LEDs in different angles, strict scientific design must be carried out in the design of packaging lenses and the selection of raw materials, which depends on the technical level of packaging suppliers. If the LED angle consistency is not good, the white balance effect of the whole screen at different angles will be very poor. Led angle comprehensive tester can measure the angle consistency of LED lamp bead, which is especially important for medium and high-grade display screen