LED device packaging has been four decades, in recent years, with the LED industry developing rapidly, LED’s expanding use of LED devices and the performance of the package form a higher and more special requirements. LED applications to adapt to a variety of different requirements of the LED packaging companies introduced a variety of advanced performance and reliable LED utensil to meet the requirements of the application side, but also promoted the LED packaging technology.

Frontier areas of concern of the LED package devices

1. high brightness, low attenuation and perfect with light red, green, blue-line oval LED for outdoor large-size, high brightness, dynamic, weather displays, LED displays is undoubtedly the only option. In recent years, with the cost increase, full-color LED display single color display has been replaced by the mainstream products for outdoor display, outdoor advertising, information display, stage background, building decoration, outdoor signs and other fields shine . 2008 Beijing Olympics, high-tech LED display products to the world is more aware of the advantages of the LED display.

The current color LED display outdoor display of large pieces of 90% red, green, blue-line oval LED. As per square meter outdoor LED display that contains the 10,000 LED devices, each hundreds of square blocks of color display includes the millions of LED, it uses the display of such a high-end LED Oval LED field, must possess the following main outstanding features: ① High brightness; ② high anti-static; ③ consistency (wavelength, brightness, angle); ④ Low attenuation; ⑤ low failure rate; ⑥ red, green and blue with light consistency.

Is well known that the LED device in this field for some time been dominated by foreign brands. Fortunately, the past two years, the domestic packaging technology has been great progress in these five areas may have been catching up.

2. high protection class of Outdoor SMD

SMD-type LED for short SMD, is a new type of LED devices, especially at the top of TOP-based SMD LED with small size, ultra-thin, high brightness, wide-angle and so on. But such devices are often used for indoor and outdoor protection do not have the performance. SMD devices in recent years as demand increased for outdoor use, especially outdoor full color display and outdoor lighting needs of buildings and high protection class of Outdoor SMD emerged.

SMD for outdoor full-color SMD display, with ultra-small pixel pitch, high efficiency, horizontal and vertical angle, color mixing effect, the advantages of higher contrast, with the increased brightness SMD has been able to satisfy the distance between 20mm outdoor display 5000 nits screen brightness requirements.

Outdoor SMD high level of protection required to meet the high temperature, high humidity resistance, resistance to harsh UV conditions, so the metal bracket and adhesive properties of PPA materials, outside the anti-UV properties of sealing glue, PPA anti-UV properties of materials, glue and outer seal PPA’s adhesive properties, permeability of outer seal glue on the key elements required to fully through selection, testing process and control to solve.

High level of protection currently available technology companies Outdoor SMD much. SMD is expected to launch this type will greatly promote the SMD in the outdoor display lighting applications, reduce the previous installation of waterproof design because of the additional costs incurred, and can simplify the design.

3. wide color gamut, low attenuation and high color temperature stability of the white SMD

In the next five years, LED devices is an important application field will be large-size LCD backlight, especially large-size LCD TVs. LCD CCFL backlight as a traditional non-environmentally friendly, energy consumption, high color gamut narrow, short life of the shortcomings, is being phased out. It is reported that due to a long life LED backlight, low power consumption, wide color gamut of advantages, in July 2009 shipments of notebook computers in the LCD backlight, LED backlight accounts for more than 40% share.

Although the LCD backlight in addition to white SMD LED solutions, there are RGB color mixing solutions, but economic and technical reasons, this program has been basically out of the market, white SMD LED backlit LCD to become the mainstream of the current program.

For large-size LCD backlight, white SMD requires the following properties: ① high photosynthetic efficiency; ② low attenuation; ③ wide color gamut; ④ high color temperature stability.

SMD present wide gamut of white light more effectively leading to the level of average 50lm 60lm per watt, LED chips of different sizes, different packages, different phosphors have different ratios of light effect. Wide color gamut white SMD light effects and non-wide gamut of white SMD light effect there is a large gap, the former only about 60%, this aspect needs to be further improved to reduce energy consumption.

Wide color gamut white SMD attenuation level is an important indicator, in addition to conventional white SMD-related attenuation factors, but also wide gamut phosphors mainly related to the stability required to select good stability and wide gamut phosphors matching high-performance fluorescent plastic.

White SMD color gamut determined degree of large-size LCD display colorful and fidelity. Thus a need to select the peak with the production of three RGB phosphors to achieve high efficiency. Now commonly RG phosphors with blue chip program.

White SMD wide gamut color gamut stability will affect the entire LCD screen color consistency and stability, because the LCD backlight module is usually composed of hundreds of pieces SMD, SMD color temperature of this a few hundred long-term stability and consistency to directly affect the stability of color LCD display performance.

With the large-size LED backlight LCD display strong growth in demand, wide color gamut SMD packaging technologies will become better and progress.

China is a big country LED package is the application of LED power. Strong demand for LED applications, LED packaging technology will promote China’s development and progress, the Chinese LED packaging companies are expected to gradually occupy the high-end packaging technology.

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