School of packaging

In modern lighting technology, COB light source and LED light source are two common types of light source. Although they both generate light from semiconductor materials, there are some significant differences in structure, properties, and applications. This article will introduce the definition, principle, characteristics and differences between COB light source and LED light source to help readers better understand and choose a suitable lighting scheme.

Definition and principle of COB light source

1.COB light source (Chip-on-Board) : COB light source is a package structure that integrates multiple LED chips, and multiple LED chips are directly installed on the same substrate to form an overall light source.

2. Principle: COB light source by connecting multiple LED chips in parallel, so that they are placed side by side on the same substrate, and the light is emitted and focused by sharing the same optical lens.

Definition and principle of LED light source

3.LED Light source (Light Emitting Diode) : LED light source is a semiconductor device. When the current is passed, the electrons in the semiconductor material and the holes are combined to release energy and produce light.

4. Principle: The LED light source uses the PN structure of semiconductor materials, and forms a binding area of electrons and holes by injecting different doped materials, thus producing light.

Three, the difference between COB light source and LED light source

5. Package structure: The COB light source is to install multiple LED chips directly on the same substrate to form an overall light source, while the LED light source is a separate chip package.

6. Light output: The COB light source uses a parallel connection of multiple chips, which can provide a larger light output with higher brightness and uniformity. The light output of the LED light source is relatively small, and it needs to be used in combination with multiple leds.

7. Color mild color presentation: COB light source is more uniform and accurate in color mild color presentation, and can provide more natural and more uniform light. The color temperature and color presentation of the LED light source are relatively less uniform and require more adjustment and control during design.

8. Heat dissipation performance: COB light source is relatively good due to the close arrangement of the chip. The LED light source needs to consider heat dissipation in the design due to its independent package structure.

9. Installation and integration: COB light source is relatively large, installation and integration is more complex, and requires more space. LED light source size is small, installation and integration is more flexible and convenient.

Application of COB light source and LED light source

10. Application of COB light source: Due to its large light output and uniform light characteristics, COB light source is often used in indoor lighting, commercial lighting, stage lighting and other scenes requiring high brightness and uniform light.

11. Application of LED light source: Due to its small size, low power consumption and flexibility, LED light source is widely used in various lighting fields such as indicators, backlights, handheld devices, car lights and so on.

COB light source is the abbreviation of chip-on-board, that is, Chip mount technology. It is to package multiple LED chips directly on a substrate, and then connect to the circuit board through a special connection technology to form an overall light source.

Compared with traditional LED light sources, COB light sources have the following differences:

1. Packaging: The COB light source packages multiple LED chips on the same substrate, while the traditional LED light source packages each LED chip separately.

2. Light output effect: COB light source because a number of LED chips are closely arranged together, can provide more uniform and continuous light output effect.

3. Thermal management: Multiple LED chips of the COB light source share a heat dissipation substrate, which can dissipate heat more effectively and improve heat dissipation efficiency.

4. Size and brightness: COB light sources are usually smaller than traditional LED light sources, but can provide higher brightness output.

In general, COB light sources are different from traditional LED light sources in terms of packaging, light output effect, thermal management and dimensional brightness, but they can provide reliable light source effects. The advantages of COB light source are mainly reflected in the following aspects:

1. Excellent light output effect: COB light source closely arranged multiple LED chips on a substrate, which can provide a more uniform and continuous light output effect. This means that it can provide better color uniformity and light distribution.

2. High brightness and high efficiency: Due to the integrated design of multiple LED chips, COB light source can provide higher brightness output. In addition, because multiple LED chips share the heat dissipation substrate, its heat dissipation efficiency is also higher, which can provide higher luminous efficiency.

3. Space saving: COB light sources are usually smaller than traditional single LED packages, which can save space and meet the application scenarios that require compact size.

4. Excellent thermal management: Multiple LED chips of the COB light source share a heat dissipation substrate, which can dissipate heat more effectively and improve heat dissipation efficiency. This helps to extend the service life of the light source and maintain the stability of the light source.

It is important to note that while COB light sources have many advantages, there are also some potential limitations. For example, because multiple LED chips are integrated on a single substrate, failure can cause the entire light source to fail. In addition, since the heat of multiple LED chips is concentrated on a cooling substrate, attention needs to be paid to thermal management measures to ensure the stability and life of the light source.

In summary, the COB light source has the advantages of excellent light output, high brightness and high efficiency, space saving and excellent thermal management, which is suitable for many lighting and display applications.

COB light source and LED light source are two common lighting sources. COB light source achieves high brightness and uniform light output through the parallel connection of multiple LED chips, which is suitable for indoor lighting, commercial lighting and other scenes. The LED light source is packaged by a separate chip, which has the characteristics of small size, low power consumption and flexibility, and is suitable for a variety of indicator and backlight applications. When choosing the right lighting scheme, factors such as light output, color temperature, color presentation, heat dissipation performance, and installation and integration need to be taken into account to meet specific lighting needs.