COB LED Assembled Circuit Board

 

COB LED, Chip On Board LED boards represent a category of high-power LED light sources. These boards possess the capacity to encapsulate multiple LED chips on a singular aluminum substrate. The configuration of the COB LED board entails the connection of multiple LED chips in parallel, with a side-by-side arrangement. The light is emitted and focused by sharing the same optical lens. COB LED boards are used in applications where high light efficiency and brightness are very important, such as outdoor lighting, automotive lighting, and backlighting. Additionally, COB LED boards find application in ultra-high definition display solutions, particularly in small micro-pitch LED displays, where they contribute to enhancing the viewing experience and safety.

How to Design a COB LED PCB?

1. Substrate Selection

Substrates are typically composed of materials that facilitate effective heat conduction and reflect light. Metal substrates are relatively cost-effective, while ceramic substrates are particularly effective in dissipating heat.

2. Packaging

Coating: It is very important to protect LED chips and solder joints with a special layer, like an organic adhesive or resin. This layer functions to shield against damage from external environmental factors.

Lens design: According to the stipulated application requirements, the integration of lenses onto the surface of the LED PCB is a viable solution to enhance light distribution and optimize the lighting effect.

3. Thermal Design

Heat dissipation structure: the dissipation of thermal energy from the COB LED board is mostly influenced by the substrate, which highlights the importance of using a high-quality substrate. Using extra heat-dissipation methods, like heat sinks and heat pipes, can make the heat dissipation even better.

Chip Arrangement: Adequate chip spacing is crucial to prevent over-dense chips from causing heat accumulation.

4. Optical Design

Color temperature and color rendering index: The particular application scenario will determine which color temperature and color rendering index is best.

Light mixing design: To achieve good light mixing efficiency in multi-color COB LED boards, it is required to design the arrangement and driving mechanism of LED chips of different hues reasonably.

5. Circuit Design

Driving circuit: The driving circuit should be designed to ensure stable operation and optimal electrical performance of the LED chips.

Intelligent control: In scenarios that demand intelligent control, the integration of an intelligent dimming system enables the adjustment of lighting brightness according to actual usage.

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