LED Will Subvert Traditional Outdoor Advertising, Second And Third Tier Cities And Great Potential

LED display

Currently LED display rapid development in China, have gradually replaced the traditional static outdoor advertising, which is a very good thing for social progress. We can see that the new airport in Shenzhen large-scale outdoor advertising light boxes have been replaced with LED display,I believe that the future of both the highway there will be more figure LED display, LED display can be said to have revolutionized the appearance traditional outdoor advertising.


Currently the application of LED display domestic cities have become saturated, second and third tier cities and even county, township enterprises in the coming years will be needed to break the market.Manufacturers are doing the brand should also focus on the future development potential of second and third tier cities,ahead of the layout in order to seize the market.

LED's characteristics and LED's manufacturing method

LED has a long life, low power consumption, high luminous efficiency advantages, lighting and LED TV backlighting

LED lamp

applications more common. 

There are a variety of white LED manufacturing method, one for the blue LED chip coated with yellow phosphor, two on the blue LED chip coated with green and red phosphors, the three, the use of red, yellow and green tricolor LED chip mixed to form white light, four in the violet or ultraviolet LED chip coated or more of three primary color phosphors. 

Used for general lighting white LED, is the principle of high-brightness blue wavelength of 445 ~ 475 nm LED excitation YAG yellow phosphor, blue and yellow are complementary use of shade, mixing a high-brightness white light, while the production of white LED; another There the wavelength 430 ~ 350 nm UV excitation of red, green, and blue phosphors to generate white light LED approach.年 2008 LED lights around the proportion of the global lighting market is only about 2%, to 2012, the global market size of the global LED lighting market will reach 4% -5%. 

LED to replace CCFL LCD backlight is the trend, coupled with a drastic fall in LED and backlight using fluorescent powder blue + RG approach than in the past to use RGB color white hybrid approach greatly reduces the cost to drive LED TV to grow, according to Displaysearch analysis, 2009 LED LCD TV market penetration of about 3% to over 10% penetration rate in 2010, the future penetration will rise year by year. 

2010 Sapphire stock prices caused by the reasons is that the permeability NB, TV, monitor backlight quickly pulled up, and almost all with blue backlight LED plus phosphor grains as white backlight, resulting in blue rising demand for LED applications. 

Upstream LED Chip Equipment in The Field

Market competition gradually to performance, technology competition transition from price competition

LED chip

in the past, and for businesses, new technology and differentiated positioning devices will become a major trend in the field of market differentiation equipment. 

Domestic equipment to compete, not only reflected its strengths from the price, the technology and quality of products must be competitive. Currently, the North has become one of the high-end microelectronic device manufacturers to China one of the few able to achieve profitability. 

ICP etcher, ITO-SPUTTER sputtering equipment and other high-end epitaxy and LED chip equipment is becoming the breakout point of domestic equipment, from leading-edge technology enables continuous tracking, to constantly introduce new products, to achieve profitability and to achieve sustainable development .

Sapphire and LED

LED sapphire refers to a substrate sheet for the processing of synthetic sapphire

( single crystal alumina ) . Synthetic sapphire ( single crystal alumina ) may be used in decorative applications ( such as jewelry , sheet glass , etc. ) , industrial materials and the semiconductor substrate such as windows , dedicated to the LED sapphire substrates require special orientation and low dislocation density, etc. Therefore, synthetic sapphire belongs to the high-end products.

LED sapphire

The first low fabricating a gallium nitride liner (GaN) -based epitaxial wafer , this process mainly in the metal organic chemical vapor deposition epitaxy furnace complete. Ready to produce GaN-based epitaxial wafer and a variety of source materials required purity of the gases , follow the step by step process requirements of the wafer can be done. The substrates used are sapphire, silicon carbide and silicon substrate , as well as GaAs, AlN, ZnO and other materials. MOCVD is the use of gaseous reactants ( precursors ) and the organometallic group Ⅲ and Ⅴ family reaction of NH3 on the surface of the substrate , the desired product is deposited on the substrate surface. By controlling the temperature, pressure, reactant concentrations and type of scale , thereby controlling the coating composition , the crystal quality of the same . MOCVD epitaxial furnace production of LED epitaxial wafers is the most commonly used devices. Next is a LED PN junction of the two electrodes for processing , the electrode processing is the key process of production of LED chips , including washing , evaporation , yellow, chemical etching , fusing , grinding ; then dicing the LED MAO , tested and sorting , you can get the desired LED chips. If the wafer cleaning is not clean enough , evaporation system is not normal , it will lead to deposition of the metal layer ( refer etched electrode ) will fall off, the appearance of discolored metal layer , gold foam and other abnormalities. Deposition process is sometimes required collet fixing chips, it will produce clamp marks ( in addition to visual inspection must pick ) . Yellow operations include baking, the photoresist , photographic exposure, development , etc., if the developer does not have holes in the mask will be full and luminous area residues more metals. Wafer manufacturing process in the preceding paragraph , the system Cheng Ruqing wash , evaporation , yellow, chemical etching , fusing , grinding and other operations must use the forceps and baskets , vehicles and so on, so there will be grain electrode scratching things from happening .

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