In recent years, the 3D full-color LED display that has been popular in recent years has made people see the progress and development of technology. While amazed, they also want to make such a 3D full-color LED display to attract traffic. Therefore, often Some people have questions about how to choose a 3D full-color LED display? Let’s take a look.
3D full color display LED selection
In the 3D full-color LED display, the most critical component is the LED lamp bead. There are three main reasons:
First, LED lamp beads are the key components used in a large number of LED full-color display screens. Thousands to tens of thousands of LED lamp beads are used per square meter, so the quality of LED lamp beads is important for the entire display screen. say it is important;
Second, LED lamp beads are also the main body that determines the optical display performance of the entire screen, which directly affects the audience’s evaluation of the display screen. The color displayed by the poor quality LED lamp beads is inconsistent, which will seriously affect the viewing experience;
Third, the proportion of LED lamp beads in the overall cost of the display varies from 30% to 70%.
From the above points, we can know that the LED lamp bead is the key component of the full-color LED display, which is equivalent to the display of the computer. A simple analogy is that in a powerful computer configuration, if the quality of the screen is not good enough, it will not be able to exert the strong effect of the computer configuration, and the same is true for the LED display.
The choice of LED lamp beads determines more than 50% of the quality of the entire display. If you fail to choose a good LED lamp bead, no matter how good the other components of the display screen are, it cannot make up for the defects in the quality of the display screen.
Whether the LED lamp bead is good or bad, we can see it from the following points:
1. 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 of LED display should not be higher than 3/10,000 (referring to the failure caused by the LED device itself) before the LED display is assembled and aged for 72 hours before shipment.
2. Antistatic ability
LED is a semiconductor device, which is sensitive to static electricity and can easily lead to static electricity failure. Therefore, the anti-static ability is very important to the life of the display screen. Generally speaking, the failure voltage of LED human body electrostatic mode test should not be lower than 2000V.
3. Attenuation characteristics
Red, green and blue LEDs all have the characteristic of brightness decay with the increase of working time. The quality of LED chips, the quality of auxiliary materials and the level of packaging technology determine the decay speed of LEDs. Generally speaking, after 1000 hours, 20 mA normal temperature lighting test, the attenuation of red LED should be less than 10%, and the attenuation of blue and green LED should be less than 15%. The accuracy of red, green and blue attenuation has a great impact on the white balance of the full-color LED display in the future, which in turn affects the display fidelity of the display.
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.
The full-color display screen is composed of pixels composed of numerous red, green, and blue LEDs. The consistency of the brightness and wavelength of each color LED determines the brightness consistency, white balance consistency, and chromaticity consistency of the entire display screen. sex. Generally speaking, display manufacturers require device suppliers to provide LEDs 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 spectroscopic color separation machine. The consistency of voltage is generally not required.
Because the LED is angled, the LED full-color LED display also has angular directionality, that is, its brightness will increase or decrease when viewed from different angles. In this way, the angle accuracy 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 on the display.
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 design of the packaging lens and the selection of raw materials, which depends on the technical level of the packaging supplier.
No matter how good the normal direction white balance is, if the LED angle consistency is not good, the white balance effect of different angles of the whole screen will be bad. The angle characteristics of LED devices can be measured by LED angle comprehensive tester, which is especially important for middle and display screens.