On September 15th at the Pudong Marriott Hotel, Shanghai, China, Seoul Semiconductor, a global leader in LED technology (www.seoulsemicon.com) announced a new product, based on the new concept of WICOP LEDs. This technology does not need processes such as die bonding or wire bonding which are necessary for conventional LED package production nor does it contain major LED package component parts such as lead-frame, or gold wire.

WICOP (Wafer Level Integrated Chip on PCB) is a totally new concept for an LED product which has overcome the limits posed by the existing CSP (Chip Scale Package) solutions. Seoul Semiconductor succeeded in developing and producing the product for the first time worldwide in 2012. As it is designed to directly connect the chip to PCB, there is no need for packaging processes, such as die bonding or wire bonding. In addition, as there is no intermediate substrate, the size of the chip and package is the same. It is characterized by the super small size and high efficiency. It is also good for the high luminance and thermal conductivity.

In the case of the widely available product TOP LED, a variety of equipment is required for the production such as die bonding machines to attach the chip to the lead frame, wire bonding machines to connect electrodes to the gold wire, as well as material in the product itself, such as lead frame, gold wire, and adhesives required in each process. Due to this packaging process a conventional LED results in a package size larger than the actual chip size, and so is space limited as the size of the chip could not be made smaller to meet specification requirements.
 
CSP (Chip Scale Package) technology, derived from silicon, is a technology developed to minimize the size of semiconductor parts (package) to the size of a chip. Generally, when the size of the package does not exceed more than 1.2 times the chip, it is classified as CSP. This technology was applied to the LED industry and other companies announced products using this technology in 2012. However, as products using this technology need die bonding equipment, intermediate substrate or ceramic and silicon material to attach the chip to the PCB, it is difficult to see the technology as a complete CSP. 

Comparison of LED production process – General LED, CSP, WICOP

General LED Package

CSP: Use of intermediate substrate between Chip and PCB

WICOP: Direct connection between Chip and PCB

Seoul Semiconductor were the first to introduce a complete concept of WICOP products in which the size of the package (PKG) is the same as that of chip, and does not use other costly materials by directly attaching the chip to the PCB. It started to mass produce relevant products and supply them to client companies, thus firmly establishing its position as the leading company in the industry. Also, it secured global patents in respect to WICOP and succeeded in constructing a technological entry barrier.
 
Since 2013, WICOP has been supplied to main customers for use in LCD backlights and camera flashes, as well as in head lamps of vehicles. With the release of an LED package WICOP2 for use for lighting applications, Seoul Semiconductor has been able to possess a WICOP product portfolio applicable to all fields of the LED industry. Seoul Semiconductor plans to actively target an LED lighting-source market made up of luminaires, vehicle, and IT products that is currently estimated to be approximately $20.000.000.000 with this WICOP technology.