With the continuous advancement of LED display technology and the increasing demand for viewing, surface mount packaging products are beginning to go outdoor applications, and outdoor surface mount LED displays are becoming more popular. However, this trend has caused people's heated discussion because of many quality events. In the end, whether the surface mount package product can replace the direct insertion lamp for outdoor LED display, what technical problems need to be solved, this article will provide an answer for the reader, if there are any deficiencies, please correct me.
In the past few years, outdoor in-line LED displays almost all use in-line elliptical red, green, and blue LED devices. In recent years, outdoor full-color LED displays with pixel pitches ranging from 8mm to 16mm are gradually being used. Rise and gain widespread use.
First, a wide range of perspectives. The outdoor surface mount full color screen not only has a wide viewing angle of 110 degrees or more in the horizontal direction, but also has a wide viewing angle of 110 degrees or more in the vertical direction, which is particularly advantageous in some application places, such as a building screen, an outdoor LED display suspended at a high altitude. A broader perspective is needed to show better advertising results.
Second, the light distribution is good. Red, green, and blue elliptical in-line LEDs match the consistency of three brightnesses at different angles, which is a very difficult indicator, while the full-color SMD has three-in-one structure, three chips of red, green and blue. All in one bracket cup, so the matching consistency of red, green and blue brightness at different angles is highly consistent, which makes the outdoor full-color surface-mounted LED display have good brightness at any angle. Achieve better color vividness.
Third, the light is good. Because the design structure is three-in-one, the three chips are very close, and the light is mixed in the same bracket cup instead of three discrete elliptical LEDs, so the red, green and blue mixed light effect is better than the straight elliptical LED. Screen, especially suitable for close-up viewing.
Fourth, high contrast. Due to the three-in-one design structure, the full-color SMD is small in size, so the light-emitting area is small, and the black area is large, which improves the contrast of the LED display.
Fifth, automated production. Surface-mount LEDs can be automated with a fully automatic placement machine for high productivity. The outdoor surface mount LED display module's circuit design can realize the combination of the light board and the drive board, which reduces the cost, improves the reliability and improves the production efficiency. In addition, automated patch production can improve the vertical accuracy of SMD on the board, overcoming the vertical accuracy of the in-line elliptical LED on the board, thus ensuring better optical effects.
Sixth, the cabinet is light in weight. The design of the aluminum alloy material box structure is very light; and the appearance is not easy to be deformed and assembled conveniently and evenly. Suitable for rental companies, car screens, mobile media; column installation or wall installation to reduce the pressure on the steel structure of the screen.
Seven, free of glue. The colloid filled in the module of the traditional outdoor screen will gradually age under the sun, rain and ultraviolet radiation, and the characteristics of the colloid will crack and fall off, causing the circuit board and the LED to lose the protective layer, even after a long time. After the heat rises and shrinks, the waterproof effect is not achieved, and the glue enters the screen through the gap, which has a corrosive effect on the PCB, affecting the life and stability of the whole screen; if it is a three-in-one outdoor glue filling process, Because the lamp foot is too short, the glue is too thin, and the consequences are more serious.
In the past, because the brightness of surface-mount LEDs was low, and the functions of waterproof, moisture-proof, and ultraviolet-proof were not able to meet the requirements of outdoor harsh environments, outdoor full-color displays are generally the world of LEDs. The surface-mounted full-color LED display can only be used in large quantities indoors. Recently, with the advancement of LED chip technology and LED packaging technology, SMD's brightness and protection level have been able to meet the needs of outdoor applications, and have achieved faster application.