LED chip are the core part of LED lamps. There are two main types of LED chip used in car headlights: COB LED chip and CSP LED chip. COB LED chip are the earliest lamp holders mentioned earlier. CSP LED chip are the mainstream on the market now. They are smaller in area, closer to the position of the halogen filament, and better matched with the reflective bowl.
Today we will discuss the advantages and disadvantages of CSP LED chip and COB LED chip.
What is LED?
LED is the abbreviation of "Light Emitting Diode" in English and is a new type of semiconductor light source. Compared with traditional light sources, LED LED chip have the advantages of low energy consumption, long life, high brightness, and low heat. The light-emitting area of LED LED chip is small, and the power of a single lamp bead is low, so the spacing between LED chip can be smaller, making the light more uniform. The LED LED chip have a larger luminous angle and can achieve a wider irradiation range.
What is COB?
COB is the abbreviation of "Chip On Board" in English and is a new type of integrated light source. COB LED chip use multiple LED chips packaged on the same substrate to form an overall light source. Compared with traditional LED LED chip, COB LED chip have a larger light-emitting area and a single lamp bead has higher power, so a larger lighting area can be achieved. The light-emitting angle of COB LED chip is smaller, which can achieve a more concentrated illumination effect.
Advantages of COB LED chip
1. Low cost:
COB technology is relatively low cost.
2. Easy maintenance:
Since COB does not have a shell or substrate, it is easier to maintain.
3. High stability:
COB's welding method can increase stability and avoid loosening and contact problems.
4. Concentrated lighting:
The light emitting angle of COB LED chip is smaller and the light is more concentrated, which can achieve better lighting effects.
Disadvantages of COB LED chip:
1. High power consumption:
COB LED chip have high power and relatively high energy consumption, requiring larger power supply support.
2. Short life:
The life of COB LED chip is relatively short, generally only about 20,000 hours.
What is CSP?
CSP, its full English name is Chip Scale Package, which refers to an LED package whose size is the size of an LED chip or no more than 20%. CSP products feature integrated components that require no wire connections, resulting in lower thermal resistance, fewer heat transfer paths, and fewer possible points of failure.
CSP LED chip are a new type of LED LED chip that use packaging technology similar to COB LED chip, but are more sophisticated in chip packaging.
The characteristics and advantages of CSP LED chip are as follows:
1. High integration:
The CSP process can shrink components to the micron level and only takes up about half of the original surface area.
2. Good electric heating properties:
CSP uses high-quality packaging materials to provide better heat dissipation and anti-static capabilities.
3. Stable performance:
Because CSP uses shorter, finer lines to connect the chip to the printed circuit board, it can provide faster and larger capacity data transmission capabilities.
4. Long life:
CSP LED chip have a long life, which can generally reach more than 50,000 hours, reducing the frequency and cost of replacing LED chip.
5.The popular flip technology Withstand high current
Flip chip (also known as direct chip attach) is the process whereby a semiconductor die is attached bond pad side down to a substrate or carrier. The electrical connection is made by means of a conductive bump on the die bond pad.
6. Eutectic welding
7. High density light
A high-density CSP LED can provide more lumens than cob led chip.
Comparative features of CSP and COB LED chip:
1. Lighting effect:
Compared with the previous generation SMD, COB is smaller in size and more integrated. COB LED chip have a smaller luminous angle and more concentrated light, which can achieve better lighting effects; while CSP LED chip use "flip chip and chip-level technology", which encapsulates multiple small-size LED chips to achieve more uniformity. luminous effect.
The cost of CSP packaging is much lower than the cost of traditional packaging technology, which can save labor costs and packaging costs to the greatest extent, and is highly cost-effective.
2. High light color accuracy and different light color consistency
Traditional COB uses a dot powder process, and the mixed light color is impure. The color is difficult to control during light mixing. Good color consistency can only be achieved by sacrificing the yield rate.
The LED chip of CSP are arranged more densely, and the light is split before packaging. The light-emitting angle is larger. The light color accuracy of CSP is relatively high. In terms of color consistency of mixed light, CSP has obvious advantages over traditional COB.
3. Super flexibility
COB has average flexibility. If handled improperly, the COB package will fall off.
Since CSP does not have fragile links such as brackets and gold wires, it uses glue to protect the LED chip, making it safe and reliable. The chip is smaller in size, can be made lighter and thinner, has a smaller bending force angle, and has stronger flexibility.
4. Heat dissipation effect:
COB LED chip have higher power and generate more heat, but the chips are densely arranged, which can achieve better heat dissipation effect; while CSP LED chip use high thermal conductivity materials, which can achieve better heat dissipation effect.
5. Lifespan:
The life of COB LED chip is relatively short, generally only reaching about 20,000 hours; while the life of CSP LED chip is long, generally reaching more than 50,000 hours.
In conclusion
COB LED chip and CSP LED chip each have their own advantages and disadvantages. COB LED headlight bulbs are currently not very powerful, and the products are more economical. CSP LED headlight bulbs have more advantages in brightness and size, and the product price is higher than COB lamp bead products. Of course, CSP LED chip are also currently developing, and in the future, five-sided LED chip will also be used in LED headlight bulbs.
