LED devices are the main component of the cost of LED displays, accounting for approximately 40% to 70% of the cost. The significant reduction in the cost of LED displays is due to the reduction in the cost of LED devices, and the quality of LED packaging has a particularly significant impact on the quality of LED displays. This article will delve into the current status of LED display SMD (surface mount package structure) packaging and the key technologies for realizing high-quality LED display devices.

Current status of LED display device packaging

SMD refers to surface mount package structure LED, which mainly includes PCB board structure LED (ChipLED) and PLCC structure LED (TOP LED). This article mainly studies TOP LED, which is a common SMD LED type. The main materials used in LED display device packaging include brackets, chips, die-bonding adhesives, bonding wires, and packaging adhesives. What is SMD led display What is DIP led display?

LED bracket

Function: PLCC bracket is the carrier of SMD LED devices and plays a vital role in the reliability and luminous performance of LEDs.
Production process: The production process of PLCC brackets includes metal strip punching, electroplating, PPA injection molding, bending, three-dimensional inkjet and other processes. Among them, electroplating, metal substrates, plastic materials, etc. are the main costs.

Structural improvement design: In order to improve the reliability of LED display devices, some packaging manufacturers have improved the structural design of the bracket, using advanced waterproof structural design, bending and stretching and other methods to extend the water vapor entry path of the bracket, and add waterproofing inside the bracket. Multiple waterproof measures such as sinks, waterproof steps, and drain holes are provided to improve the reliability of the product. What is the difference between SMD LED display and COB LED display?

chip

Function: The LED chip is the core of the LED device, and its reliability directly affects the life and luminous performance of the LED display. Here are LED Chips: Technology, Applications and Development. https://www.sostron.com/service/faq/7739

Packaging trends: As the size of LED chips continues to shrink, the reliability of LED devices is facing challenges. The reduction in size leads to a reduction in welding quality, and problems such as gold balls and electrodes may fall off, seriously affecting the performance and reliability of the LED. How does an LED chip emit light?

bonding wire

Function: Bonding wire realizes the electrical connection between the chip and the pin, and is one of the key materials for LED device packaging.

Commonly used materials: Common materials for bonding wires include gold wire, copper wire, palladium-plated copper wire, etc., each with its own advantages and disadvantages. In recent years, in order to prevent oxidation of copper wires, palladium-plated copper wires have gradually attracted attention from the packaging industry.

glue

Material selection: Commonly used glues for LED display device packaging include epoxy resin and silicone. Epoxy resin is easy to age and get wet, while silicone has better cost performance and insulation, but poor air tightness.

Discussion on key technologies

As LED displays develop towards the high-end market, the quality requirements for LED display devices are getting higher and higher. Key technologies to achieve high-quality LED display devices include:

Improvement of bracket structure design: By improving the structural design of the bracket, the path for water vapor to enter is extended, waterproofing measures are added, and the reliability of the product is improved.

Chip size control: Control the size of LED chips to avoid welding quality problems caused by too small sizes.

Bonding wire material selection: Select appropriate bonding wire materials, such as palladium-plated copper wire, to improve the reliability of the package. Here are the wireless LED display technology answers.

Glue application technology: Improve the stress of the glue while achieving a matte matte effect and improving the LED display effect.

Conclusion

LED display SMD packaging is one of the key links in realizing high-quality LED display devices. By optimizing the bracket structure, controlling the chip size, selecting appropriate bonding wire materials and glue application technology, the reliability and quality of LED display devices can be effectively improved to meet the growing high-end market demand and promote the progress and development of LED display technology.

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LED display SMD packaging: the key technology to create high-quality devices