The cob lamp is a COB (chiponboard) chip package, which is a kind of lamp fabricated by bare chip mounting technology. The semiconductor chip is placed on the printed circuit board, and the electrical connection between the chip and the substrate is realized by a wire stitching method. The electrical connection of the substrate is achieved by a wire stitching method and covered with a resin to ensure reliability.
A COB luminaire is a spotlight that uses a COB source as a source of illumination. The traditional spotlight source adopts halogen lamp and high-power LED. The halogen lamp has low luminous efficiency, relatively low power consumption, and the temperature of the irradiated environment rises, and the service life is short. However, the high-power led partial light effect is too strong, the spot is uneven, and there is darkness. Where. COB lamps are far superior to traditional lighting products in terms of lighting principle, energy saving and environmental protection. Moreover, the unidirectionality of the illumination of the COB luminaires forms the perfect support for the light distribution of the spotlights.
1. Energy saving: COB lamps of the same power consume only 10% of incandescent lamps, and are more energy efficient than fluorescent lamps.
2, long life: COB lamp beads can work 50,000 hours, longer than fluorescent lamps and incandescent lamps.
3, dimmable: the previous dimmer has been for incandescent lamps, incandescent lamps dim when the light is red; it is difficult to see the fluorescent dimmer, which is the main reason why dimming technology has not developed for many years; COB The luminaire can be dimmed again, and both the bright and the dark light are the same color (the color temperature is basically the same), which is obviously better than the dimming of the incandescent lamp.
4, can be frequently switched: the life of the COB lamp is calculated according to the lighting, even if the switch is switched thousands of times per second does not affect the LED life, in the occasion of decoration and other occasions need to frequently light up, COB lamp has an absolute advantage.
5, rich in color: There are various colors such as white light, white light, red, green, blue, etc., whether it is the small lanterns or neon lights used for embellishment beside the headlights in the living room, they are very bright.
6, low heat: like spotlights, many 220V spotlights are not broken in a few days because of fever. Although the 12V halogen spotlight has a lower heat than the 220V spotlight, it has a brightness that does not reach the nominal value due to insufficient power of the transformer. With COB lamps, you can work for a long time without a transformer.
7. Low maintenance costs. The cob lamp has a long service life, and the luminous flux half life is more than 50,000 hours. It is generally used for more than 30 years. It has strong impact resistance and shock resistance. There are no vulnerable parts such as tungsten wire and glass bulb. The possibility of abnormal “disposal†is very small.
COB lamps are now more popular lamps, which are safer and have a longer service life than ordinary incandescent lamps. At the same time, due to the different principles, the COB lamps emit light that is softer and more comfortable to use. With the development of society, there will definitely be more products like COB lamps entering our lives. We need to know more and use them.
The application of COB package has been applied in the field of lighting for many years. It has many advantages in various aspects, so it has been favored by many lighting companies. So what kind of spark will COB packaging technology be applied to the display screen? Will there be some levels of acclimatization? Let's analyze the advantages and disadvantages of COB packaging. It is understood that COB packaging technology is applied to the display screen, which has the incomparable advantages of traditional packaging technology.
1. Ultra-thin: According to the actual needs of customers, PCB board with thickness from 0.4-1.2mm can be used to reduce the weight to 1/3 of the original traditional products, which can significantly reduce the structural, transportation and engineering costs for customers.
2. Anti-collision and compression: The COB product directly encapsulates the LED chip in the concave lamp position of the PCB board, and then is cured by epoxy resin. The surface of the lamp point is convex into a spherical surface, which is smooth and hard, and is resistant to collision and wear.
3. Large viewing angle: The COB package uses shallow well spherical illumination, the viewing angle is greater than 175 degrees, close to 180 degrees, and has a better optical diffuse color dimming effect.
4. Bendable: Bendability is a unique feature of COB packages. PCB bending does not cause damage to packaged LED chips. Therefore, LED arc screens, circular screens, and wavy screens can be easily fabricated using COB modules. . It is an ideal substrate for personalized screens in bars and nightclubs. It can be seamlessly spliced, the production structure is simple, and the price is far lower than the LED shaped screen made by the flexible circuit board and the traditional display module.
5. Strong heat dissipation: COB products are packaged on the PCB board, and the heat of the wick is quickly transmitted through the copper foil on the PCB board. The thickness of the copper foil of the PCB board has strict technical requirements, plus the immersion gold process. Hardly causing severe light attenuation. Therefore, there are very few dead lights, which greatly extend the life.
6, wear-resistant, easy to clean: the surface of the lamp point is convex into a spherical surface, smooth and hard, collision-resistant and wear-resistant; there are dead spots, you can repair point by point; no mask, dust can be cleaned with water or cloth.
7, all-weather excellent characteristics: the use of triple protection treatment, waterproof, moisture, corrosion, dust, static electricity, oxidation, UV effect is outstanding; to meet all-weather working conditions, the temperature difference of minus 30 degrees to zero 80 degrees can still be used normally.
To put it bluntly, the advantages of the COB display package are really quite a lot, especially when compared with the traditional package form, the contrast effect is more obvious. Since there are many advantages, why not get a large-scale application in the early development of LED display? What are the inadequacies of COB packaging? Hu Zhijun, deputy general manager of Shenzhen Weiqiaoshun Optoelectronics Co., Ltd. said: "The only shortcoming of COB packaging is that the screen ink color is not well controlled, that is, when the lamp is not lit, the surface ink color is inconsistent." Shenzhen Aolida Technology Co., Ltd. Yang Rui, the company's marketing director, said frankly: "The scarcity of the COB display package is that the surface consistency is not enough. If this problem is not solved, it will be difficult to get the customer's approval."
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