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LED lamp beads LED display as the highest cost, the largest amount of components, the level of quality LED display plays a decisive role. Today we will talk about why LED lamp beads are the most critical components of LED display, how to identify the advantages and disadvantages of LED lamp beads!
The most critical part of the full-color LED display is the LED lamp bead; there are three reasons:
First, the LED lamp bead is the most used key component in the whole color display, and thousands to tens of thousands of LED lamp beads are used per square meter;
Second, the LED lamp bead is the main body that determines the optical display performance of the whole screen, which directly affects the viewer's evaluation of the display screen;
Third, LED lamp beads account for the largest proportion of the overall cost of the display, ranging from 30% to 70%.
How to identify the advantages and disadvantages of LED display beads
1, solder joints. The LED strips produced by the regular LED strips are manufactured by SMT chip process using solder paste and reflow soldering process;
2, FPC quality. FPC is divided into copper and rolled copper. The copper foil of the copper plate is convex. If you look closely, you can see it from the connection between the pad and the FPC.
3, the cleanliness of the surface of the LED light strip. If the LED strip produced by the SMT process has a very clean surface, no impurities or stains can be seen.
4, LED chips and production process, with the eyes can not see the difference, to use aging equipment and testing equipment, if you put several manufacturers of LEDs on the aging instrument with high current aging for 24 hours or longer You then measure the LED brightness of several manufacturers to see which LED has the lowest attenuation of the luminous intensity, and the lowest attenuation is the best.
LED lamp beads on the LED display
1. Perspective
The viewing angle of the LED lamp bead determines the viewing angle of the LED display. At present, most of the outdoor display screens use elliptical LEDs with a horizontal viewing angle of 100° and a vertical viewing angle of 50°, and the indoor display screen uses a patch LED with a horizontal and vertical 120°. The display on the highway is usually a circular LED with a 30° viewing angle due to its particularity. Some high-rise buildings require a higher vertical viewing angle. The angle of view and the brightness are contradictory, and a large angle of view necessarily reduces the brightness. The choice of perspective needs to be determined based on the specific application.
2, brightness
Brightness is an important determinant of display brightness. The higher the brightness of the LED, the larger the margin of current used, which is beneficial for saving power and keeping the LED stable. LEDs have different angle values. In the case where 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 line of sight, a balance 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 red, green and blue LEDs, the failure of any color LED will affect the overall visual effect of the display. In general, according to industry experience, the failure rate before the LED display starts to assemble to aging 72 hours before shipment should be no more than three ten thousandth (refer to the failure caused by the LED lamp itself).
4, antistatic ability
LEDs are semiconductor devices that are sensitive to static electricity and are highly susceptible to electrostatic failure. Therefore, antistatic capability is critical to the life of the display. In general, the LED's human body static mode test failure voltage should not be lower than 2000V.
5, life
The theoretical life of LED devices is 100,000 hours, which is much larger than the working life of other components of LED display. Therefore, as long as the LED device quality is guaranteed, the working current is suitable, the PCB heat dissipation design is reasonable, and the display production process is rigorous, the LED device will be the display screen. One of the most durable parts in the machine.
LED devices account for 70% of the price of LED displays, so LED devices can determine the quality of LED displays. China is a big country in the production of LED devices, and it is also a gathering place for LED display. The high technical requirements of LED display is the future development trend. The high quality requirements of LED display are not only related to the trend of LED display manufacturers, but also the development of LED display device manufacturers. From the LED device check, promote China's transformation from a large LED display manufacturing country to a LED display manufacturing power.
6, attenuation characteristics
When the LED display is operated for a long time, the brightness will drop and the color of the display will be inconsistent, mainly due to the brightness degradation of the LED device. Attenuation of the LED brightness can cause the overall screen brightness of the display to decrease. Inconsistent brightness attenuation of red, green and blue LEDs will cause inconsistencies in the color of the LED display, which is what we often say about the display. High-quality LED devices provide excellent control of the brightness attenuation. According to 1000 hours of normal temperature lighting 20mA standard, red attenuation should be less than 2%, blue and green attenuation should be less than 10%, so blue and green LEDs should not use 20mA current in the display design, preferably only 70% to 80% % rated current.
In addition to the characteristics of the red, green and blue LEDs, the attenuation characteristics are affected by the current, the heat dissipation design of the PCB, and the ambient temperature of the display.
7, size
The size of the LED device affects the pixel point distance of the LED display, ie the resolution. The 5mm elliptical lamp is mainly used for outdoor display above P16, the 3mm elliptical lamp is mainly used for P12. 5, P12, P10 outdoor display, 3528 type patch LED is mainly used for P6, P8 indoor display. The 2020 SMD LED is mainly used for indoor displays such as P2 and P3. Under the premise of constant dot pitch, the LED device size increases, which can increase the display area and reduce the graininess. However, due to the reduction of the black area, the contrast will be reduced. On the contrary, the LED size is reduced, the display area is reduced, and the graininess is increased. The black area increases and the contrast is increased.
8, consistency
The full-color display is composed of countless red, green and blue LEDs. The brightness and wavelength consistency of each color LED determine the brightness consistency, white balance consistency and uniformity of the entire display. Sex. In general, display manufacturers require device vendors to provide LEDs with a wavelength range of 5 nm and a brightness range of 1:1. These specifications can be achieved by device suppliers through a spectral color separation machine. The consistency of the voltage is generally not required.
Since the LEDs are angled, the full-color LED display also has angular orientation, that is, the brightness is increased or decreased when viewed at different angles. In this way, the angular consistency of the red, green, and blue LEDs will seriously affect the consistency of white balance at different angles, directly affecting the fidelity of the display video color. In order to achieve the consistency of the brightness changes of the red, green and blue LEDs at different angles, it is necessary to strictly carry out scientific design on the packaging lens design and raw material selection, depending on the technical level of the packaging supplier. In the normal direction, the white balance is good. If the angle of the LED is not consistent, the white balance effect at different angles of the whole screen will be bad. The angle uniformity of the LED lamp bead can be measured by the LED angle comprehensive tester, which is especially important for medium and high-end displays.