Advantages and differences between surface mount (SMD) and DIP display

         In recent years, the market size of full-color surface mount (SMD) outdoor LED displays has increased rapidly, and more and more applications in outdoor advertising screens, outdoor light box screens, car screens, stadiums and other fields. Recently, all manufacturers are striving to introduce ultra-high-cost outdoor surface-mount products, so what are the benefits of outdoor surface-mount products? Today, we will announce them one by one.

    Outdoor surface mount products adopt outdoor surface mount lamp beads, and the proportion of light mixing is strictly controlled. The screens produced in a certain period of time can keep the batch consistent, and can be used for splicing and preparing the library to solve the problem of inconsistency of different batches of screens. Its wide viewing angle of 140° is larger than that of the in-line product of 55°, which more satisfies the needs of outdoor applications.

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    The outdoor surface mount adopts a three-in-one package design structure, in which the SMD2727 lamp bead is taken as an example, the area of ​​each pixel is 2.7×2.7=7.29 mm2, and the area of ​​each pixel of the popular DIP346 is π×1.5×2. ×3 = 28.26 mm2. Obviously, the duty cycle of the lamp bead is far lower than the duty cycle of the in-line, so the contrast of the surface-mount products is higher, the screen display effect is better, and the advertising efficiency is greatly improved. At the same time, due to the large duty cycle of the module and sufficient space, the maintenance time of the module is greatly shortened.

    2.jpeg

    As shown above, compared with DIP, SMD red, green and blue chips are all in one bracket cup, the distance is close, so the matching heights of red, green and blue are different at different angles, and the light mixing effect is better. The color reproduction is more realistic, making the outdoor LED display more vivid.

    3.png

    IC and lamp foot on the same side are prone to interference

    The lamp pins of the DIP lamp directly pass through the PCB board, and the lamp foot bends on the back side of the PCB board, which results in a small back space of the PCB board, and the IC is difficult to lay out. Since the DIP product IC is usually placed on the front side of the PCB board, EMC interference is easily generated. The SMD lamp is usually placed on the front side of the PCB, and the IC is placed on the back. The IC has a wider layout space in the process. The interference between the IC and the IC is reduced, there is no possibility of contact with the lamp pin, the interference is reduced, and the product is improved. stability.

    In summary, the outdoor surface mount LED display has many advantages such as "wide viewing angle, good light distribution, good light mixing, high contrast", and is more favored by customers than direct insertion.

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