With blue and white light emitting diodes (LED) in 1990 after a massive move towards the practical stage, whether it is conducted by the use of full color led street light wholesale, or in the community on energy issues in recent years exhibited a high degree of importance , LED the popularity of the smart phone, a personal computer (PC), TV backlight, lighting, white goods, such as traffic lights or a variety of product applications more widely. To meet market demand, the industry for a variety of products, including the ability to achieve high color rendering and high reliability lighting LED, as the representative of the product to PICOLED small thin LED, and car customization, such as color LED devoted considerable R & D resources.
By the world trends and energy-saving awareness Tohoku earthquake in Japan triggered by the rising Japanese market for white LED lighting with increased demand, prompting the LED lighting market value is constantly growing rapidly, however, to let the light source completely from the traditional incandescent bulbs lighting the way converted to LED lighting, still exist some problems to be solved on the product features, including the industry 's R & D focus in particular LED lamp with high color rendering and high reliability-based, the following will be employed for high Ra value luminous efficiency and make sharing technology.
The average CRI evaluation index (Ra) is the performance of an object or light source to reproduce the true color of an index, the index is higher, on behalf of the better color reproducibility (sunlight Ra = 100), forward lighting with white light on the market LED luminous efficiency can be both high and high CRI (Ra ≧ 80), but there are benefits they weigh (Trade-off) characteristics between the two luminous efficiency and Ra values. Because the market for a higher luminous efficiency requirements, so currently on the market are mostly Ra ≒ 70 high luminous efficiency LED.
Usually white LED package structure of the blue LED chip is mounted on the substrate, and the phosphor-containing resin encapsulation. In the light emission color (yellow, red or green, etc.) Mixing luminescent color (blue) LED element and the phosphor will form white light.
From the viewpoint of luminous efficiency, generally mostly blue + yellow to white light, red light, but this will result in poor reproducibility and is therefore not suitable for illumination purposes. Usually the solution is used to increase the red component, thereby improving the reproducibility of the red light, but this will not lead to the desired light emission efficiency problem.
To take into account the high luminous efficiency and high Ra value, the industry will have efficient phosphor inside the package configuration in order to best of both worlds as countermeasures technology, successfully developed Ra ≧ 80 and high luminous efficiency products. This series of products in terms of Ra or R9 (red) are very good performance of the Index, the Ra value of other brand products the same comparison, the higher the value of the products R9, red is also better reproducibility. With this breakthrough technology, LED lamps not only can reduce the color uneven, but also should be more careful because the chroma level.
In recent years, the market demand for reliability has become increasingly relevant high. Especially due to the high reflectivity of the LED package, the general approach they use silver-plated, but because silver sulfide (a phenomenon due to reaction with sulfur to produce darkening ) LED beam deterioration caused by the phenomenon caused by the outdoor LED lights serious problems, so various companies compete proposed countermeasures of various silver-plated solutions, but the problem is still not fully improved.
In view of this, the industry abandon silvered way, shift to nickel / gold plating way. After the LED package to silvered nickel / gold, although it will lead to increased costs and reduced reflectance due caused by poor luminous efficiency, but by improving the packaging structure, present these issues have been successfully overcome.
The new package structure both to maintain high luminous efficiency, but also to achieve high reliability LED light performance, the series even in curing experiments also show excellent performance, you can completely avoid beam degradation phenomena.
With the size and weight of a mobile device volume, year after year strong market demand for small pitch products, parts are also facing more to reduce the height and reduce the size of the request. In addition, since most of the outdoor full color display device using LED, in order to improve performance results, full-color type LED package also towards higher density development.
To make the package smaller and thinner, the internal components must also use LED thin compact size. Therefore, the industry from the light-emitting layer film on the wafer-to-wafer technology are used self-developed process technology, and finally succeeded in narrowing AlGaInP (AlGaInP) LED light-emitting element size to the corners 0.13 mm (mm), The thickness t = 50 micrometers (μm), the target stroke miniaturized.
To ensure the strength of the product, processing industry made of a resin for sealing the semiconductor element. Sealing resin molding processing system using Migration (TransferMold) method, but the mold cavity mold will become increasingly thin (thickness of 0.10 mm cavity) , so you must ensure that the flow of the resin. Furthermore, to ensure the optical characteristics of the LED, it will not add to the strength of the parts to ensure that the filler material, this way, the product will result in reduced mechanical strength, but to solve the above problems have switched current.
The LED chip production, must t = 0.10 mm in thickness sealing resin for LED element wire, so industry uses self-developed wire bonders, successfully reduced spacing and reduced loop.
Currently, the world's smallest ultra-small size LED volume is only 1006, the thickness of only 0.2 mm, this product is not set limitations of space, and the use of high-brightness LED components, LED light through, so that the light can be worn inside the mobile phone from the case through lighting.
Not only that, but also suitable for ultra-small LED dot matrix display. 1608 size products of traditional minimum spacing of 2 mm, while the ultra-compact LED spacing of 1.5 mm was able to minimize the high-density mounting, so they can show more detailed performance results.
In other characteristics, due to the extremely small package size of the program, it can be used on the seven-segment displays, dot matrix display modules, and omit the package directly on the wafer (COB) technology necessary for die attach (Die- bonding), wire, resin bonding (Bonding) and other processes.
With LED bulbs and lighting purposes rapid popularization of led street light wholesale car more than ever favored by the market. Use in the vehicle interior, whether main backlight Car Audio, Car navigation systems or air conditioning panels, almost fully uses LED light sources. Then, like a light bulb is still using the traditional indoor lights and warning lights, and the use of a cold cathode tube dashboard backlighting will gradually face the fate of replacement.
Installed outside the vehicle, in recent years, such as taillights, turn signals, lights and other traditional bulb positioning has gradually been retired, even by conventional halogen headlights are high-intensity discharge (HID) lamps are LED lights turn replaced. If identifiability from the environment point of view, the use of LED lights as DRL (Daytime Running Lamps, DRL) trend is even more noteworthy.
To meet the needs of a variety of automotive industry in the car with the LED technology research and development, R & D will focus on the following two.
In the automotive interior areas, such as air-conditioning panels, dashboard light mostly around the depot to specify the color. Industry has launched a component type AlGaInP LED products, relying on the advantages of home-made components, whether it is color, luminosity can be customized according to customer requirements of their own.
Others, such as the use of indium gallium nitride (InGaN) and phosphor-containing resin to create the success of white and pink LED series also offers color customization capabilities. Like backlit keys and other major keys to use higher frequencies can be subtle color differences highlight its adjacent keys of dissimilarity, thereby arousing the attention of the user. This AlGaInP epitaxial growth on the components used (Epitaxial Growth) stage wavelength differences suppression technology, so customers can meet strict specifications.
On the other hand, the market for uses outside the tail lights of the vehicle mounted LED light than heat resistance and maximum requirements for resistance to harsh weather, but the conventional led street light wholesale silver-plated lead frame material, and curing light prone deterioration of the problem, the current problems began to receive attention.
In view of this, the industry changed nickel / palladium / gold-plated lead frame material as successfully solve problems caused by the deterioration of the beam caused by vulcanization. In addition, the luminosity nickel / palladium / gold plated to reduce the disadvantage caused, industry Zheyi developed a new range of products, by increasing the output efficiency of the device itself to solve, showing favorably beam intensity silvered products. In the future, the industry will adopt a nickel / palladium / gold plated improvement measures as a package sulfide, and actively expand new products to meet the diverse needs of customers.
More info you can visit: http://www.lead-lighting.com/products/sid107-1.htm
No comments:
Post a Comment