LED industry: the shining star of hope two

4.2 main advantages of LED light source

LED light-emitting principle is the use of electronic and hole in a semiconductor with a photon, different from the bulb needs high temperature above 3000 degrees under the operation, also need not like fluorescent lamp with the high voltage electron beam excitation, LED and electronic components generally the same, only need 2 to 4 volts (V) voltage you can, under normal temperature and normal movement, so its life is longer than the traditional light source, up to 100 thousand hours or more (currently the industrialization of foreign can reach 3~5 million hours).

The luminous efficiency of incandescent lamp is 8--15 lm/ W, common T-8 halogen fluorescent lamp efficiency can reach 40 lm/ W, T-5 efficient fluorescent lamp can reach 80 lm/ W, LED light efficiency can reach 200lm/w, LED and millisecond on-off time, this is also the general application of light source can not be achieved.

The color of LED is mainly determined by the energy released by the combination of electrons and holes, which is determined by the energy gap of the semiconductor material used. The wavelength of the same kind of material is very close, so each LED light color is very pure, and the traditional light source are mixed with a variety of colors, LED can be said to be a digital light source.

LED chip size can be used for arbitrary cutting, the size of the commonly used 0.3 ~ 1mm or so, compared with the traditional light bulbs or fluorescent lamps, the volume is much smaller. For ease of use, LED is usually used for resin packaging, a variety of shapes around 5mm, strong earthquake.

4.3 LED mobile phone market outlook

For the LED application on the mobile phone, which can be divided into four categories, the first category indicator for the call, about 1; the second category is the mobile phone with digital camera using a flash collocation, about third; for the screen backlight source about using 2-6, fourth is about the use of 6-10 backlight button so, add up to a total of at least about 10~12 LED, and the high order model could reach 19~20 LED, the contribution of the mobile phone visible to the LED industry.

From the perspective of global sales, in 2005 the mobile phone market accounted for up to 62%, from the volume point of view, the mobile phone market accounted for up to 18%, the mobile phone market is the first wave of the LED industry is well deserved. Although the mobile phone market is still growing, but growth has slowed; on the other hand, more and more new kinds of mobile phone has many additional functions of the mobile phone to mobile phone, high power consumption, energy-saving requirements increasingly strong, which will promote the OLED panel to lower energy consumption alternative to TFT LCD panel, OLED is self luminous, does not require a backlight the demand for LED decreased.

Overall, the main market is still in the LED mobile phone market at present, but the mobile phone market is on the decline, promote LED needs new application market growth, white LED general lighting is expected to enter the market after 2010 will really come, at this stage there are two "ready" big market potential - LCD and LCD TV, notebook backlight and backlight and automotive interior lamps before and after market.

4.4 LED NB and LCD TV Backlight Market Outlook

4.4.1 LED backlight technology leading edge

LED as the backlight of LCD, compared with the traditional backlight technology, in addition to the advantages of the color gamut range, there are many unique advantages, summed up in ten areas:

Energy saving. At present, the consumption of lighting accounts for about 20% of the total electricity consumption, the same lighting effect, the power consumption is incandescent lamp, fluorescent lamp 1/2 of the 1/8. The United States, Japan and other countries and Taiwan area to predict the LED lighting efficiency, fluorescent lamp and incandescent lamp 55% us 55% replaced by LED, annual electricity savings of 35 billion U. s.dollars, an annual reduction of 7.55 tons of carbon dioxide emissions; Japan 100% incandescent lamp replaced LED, can reduce 1 ~ 2 nuclear power plant generating capacity, annual savings 1 billion liters of crude oil consumption; fluorescent lamp and incandescent 100% 25% in the Taiwan area are white LED to replace, save 11 billion kwh per year.

LED backlight has better color gamut. Its color performance is stronger than the CCFL backlight, can display the lack of color LCD technology has a very good role in making up, color reduction good; LED service life can be up to 100 thousand hours. Even if the continuous use of 10 hours a day, can also be used for a continuous period of up to 27 years, greatly extended the life of LCD TV, access to the overwhelming superiority of plasma technology; brightness adjustment range. LED power control is easy to achieve, unlike the CCFL minimum brightness threshold. Therefore, it is easy for the user to adjust the brightness of the display device to the most pleasing state in the bright and dark room. The traditional CCFL lamp flicker frequency is low, the performance of the dynamic scene may produce picture jitter.

LED backlight can flexibly adjust the luminous frequency, and the frequency is much higher than CCFL, so it can be a perfect picture of the movement. The red green and blue 3 color light independently, easy to precisely control the color characteristics of the display; backlight can adjust the white balance, while ensuring the overall contrast. When the user's video source is switched between the computer and the DVD, the white balance can be easily adjusted between 9600K and 6500K, and the brightness and contrast can not be sacrificed. LED is a kind of planar light emitting light source, the basic unit is 3 ~ 5mm square package, easily grouped together into a given area surface light source, has good brightness uniformity, as if the LCD TV backlight, auxiliary optical components required to do is very simple. The screen brightness uniformity is more