Tai-saw independent research and development of DPC technology, to meet the performance requirements of high brightness LED

Direct copper plating tai-saw independent research and development of DPC technology, is a combination of art and film plating process on ceramic substrate production, image transfer (PHOTOLITHOGRAPHY) made of the metal line, to form a ceramic circuit board with double metal plating layer. Due to the advantages of high heat dissipation, high reliability, high precision and low cost, DPC substrate has been widely used in high brightness LED heat sink. Now from the existing problems of similar products and technical characteristics of DPC and other aspects of the detailed interpretation of the advantages of DPC ceramic substrate products.

There is a, the existing products of the same type of problem

The past can only be used for LED status indicator era, the heat dissipation has never been in question, but in recent years due to the brightness of the LED, and began to actively promote all power, backlight and lighting applications for electronic packaging, the heat of LED has quietly emerged. In 2003, Lumileds Lighting's Roland Haits, on the basis of an empirical observation of science technology in the past the inference from the law, the first commercial LED since the beginning of 1965, in the 30 years of development, LED about every 18 months ~24 months the brightness can be doubled, while the next 10 years that is expected to further enhance the brightness can be 20 times, and the cost will be reduced to the existing 1/10, which is popular in recent years began to Haitz s law, which is regarded as the LED Moore s law ", as shown in figure 1.

Not only the brightness rising, LED cooling technology has also been improved, the thermal impedance in 1992 a LED (thermal resistance) 360 ~ C/W, then fell to 125 degrees C/W, 75 degrees C/W, 15 degrees C/W, now is to each 6~10 / C/W point, more simply, the previous LED each consumes 1 watts of power, the temperature will increase 360 ~ C, now is the same as 1 watts of electrical power consumption, temperature by only 6~10 ~ C. This shows the importance of heat dissipation. If the heat problem is not resolved, so that the heat of the LED can not be resolved, so that the operating temperature of the LED rise, the main impact of two: (1) reduced brightness, (2) service life decay. The effect of temperature on brightness is linear, but the effect on life is exponential. The Philips Lumileds Lighting Luxeon K2 as an example, when the operating current is 350mA, the same to the junction temperature as the standard, if the junction temperature can be kept in use below 120 DEG C, then LED has nearly 60000 hours of life, 130 degrees C is only 30000 hours, 150 ~ C in 10000 hours more than 150 degrees, C, or LED that is likely to burn. The rise in temperature, light from 120 degrees C to become a mere C of 10 degrees C, the service life is reduced from to 1/2 hours of the time of 30000 hours, it can be seen that the heat damage to the LED product is very large. Figure two is the relative diagram of Luxeon K2 in LED p-n junction temperature and its use time.

[1] [2] [3] [4] next page