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Elaborate COB packaging, LED chips why it so important?
cob, tcob, mcob, led, tubes, lights, lamps, lighting, reviews: What is COB? Its full name is the chip-on-board, that is, chip on board package, is a distinguished SMD surface-mount technology, the new package, in particular the LED bare chip with a conductive or non-conductive adhesive attached to the PCB, and then wire bonding to achieve its electrical connections, and the use of plastic chips and bonding wires encapsulated.
Keywords: LED package, LED technology, led, light, cob, tcob, solution, technology, mcob
What is COB? Its full name is the chip-on-board, that is, chip on board package, is a distinguished SMD surface-mount technology, the new package, in particular the LED bare chip with a conductive or non-conductive adhesive attached to the PCB, and then wire bonding to achieve its electrical connections, and the use of plastic chips and bonding wires encapsulated.
This package does not do the package, but the integration of upstream and downstream businesses, the package from the LED chip to produce LED display module or display units are completed in a factory, consolidate and simplify the packaging companies and manufacturers display production processes, production process more easy to organize and control, product spacing can be smaller, reliability doubled, the cost is closer to ordinary people.
COB package early in the lighting application, and this application has become a trend, it is understood, COB package Bulb LED light bulbs have occupied about 40% of the market.
With the maturity of LED application market, users of the product stability, reliability increasingly high demand, especially under the same conditions, product requirements can achieve better energy efficiency targets, lower power consumption, as well as more competitive power prices. Based on this, compared with the traditional LEDSMD SMD package and high-power package, chip on board (COB) packaging technology to integrate multiple LED chips directly encapsulated in a metal base printed circuit board as a substrate by direct lighting module heat, not only can reduce the cost of the manufacturing process and its holder, but also has the advantage of reducing the thermal resistance of the heat, and therefore become a lighting package business owners push.
COB light source in addition to good heat dissipation performance, low cost costs, but also personalized design. But technically, COB package still bad light, short life, poor reliability shortcomings, if they can be resolved, the future direction will be one of the leading packaging development.
COB applications in lighting has become a trend and trends, then this packaging technology can apply it on the screen? On the package, companies have made a new attempt, and this attempt has also been verified, has been to promote the use in the market, in the meantime, has sparked widespread concern in the industry professionals. So, COB display Why do you get everyone’s attention? There must be a reason.
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A, COB package Advantages and Disadvantages
COB packaging applications in the field of lighting has been used for many years, there are many advantages in its various aspects, so get a lot of lighting companies favor, the COB packaging technology in the screen above, what will spark clashes? It will also have some level acclimatized phenomenon? Together to analyze the advantages and COB packaging deficiencies. It is understood, COB packaging technology applications in the display, traditional packaging technology has unparalleled advantages.
1. Ultra-thin: according to the actual needs of customers, with a thickness from 0.4-1.2mm thickness of the PCB, so that the weight is reduced to a minimum of 1/3 of the original traditional products, customers can significantly reduce the construction, transportation and engineering costs.
2. Compressive collision: COB LED chips directly to the product is packaged in the concave position of the PCB within the lamp, and then encapsulated with an epoxy adhesive cured, the surface light point spherically convex, smooth and hard, wear-resistant crashworthiness .
3. Large viewing angle: COB package uses a shallow spherical light emission angle greater than 175 degrees, close to 180 degrees, and has better optical diffuse muddy color light effect.
4. Bending: flexible capability is a unique feature of COB packaging, PCB bending without causing damage to the packaged LED chip, the use of COB LED modules can easily create curved screen, circular screen, wave shaped screen. It is the ideal base bars, nightclubs personalized styling screen. Seamless splicing can be achieved, making the structure simple, and the price is far less than traditional flexible circuit boards and display module produced LED shaped screen.
5. Cooling ability: COB packaging products are the lights on the PCB, the heat quickly spread through the wick copper PCB board, and copper thickness of the PCB, there are stringent process requirements, coupled with Immersion Gold craft, hardly serious light attenuation. So little dead lights, greatly extending the life of the LED display.
6, wear-resistant, easy to clean: light point projection into a spherical surface, smooth and hard, crashworthiness wear; a spot appears, point by point maintenance; no masks, dust, water or cloth to clean.
7, excellent all-weather properties: The triple protective treatment, waterproof, moisture, corrosion, dust, static electricity, oxidation, ultraviolet outstanding results; work around the clock to meet the conditions of minus 30 degrees to plus 80 degrees temperature difference can be used.
To say it, COB show the advantages of the package are quite a lot, especially with the traditional package a comparison, the contrast is even more pronounced. Since there are many advantages, why not in the early development of the LED display of large scale use of it? Deficiencies COB package has been reflected in where? Shenzhen Overseas Chinese Wei Shun Photoelectric Co., Ltd. Deputy General Manager Hu Zhijun expressed: “COB package only drawback is that good control screen ink, that is not lit when the ink surface inconsistency problem.” Science and Technology Co., Shenzhen Ao Leida Rui, director of marketing, admits: “COB show package flawed lies in the consistency of the surface is not enough, the problem is not resolved, it is difficult to obtain customer approval.
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