product news ♦ LEDs
IR components can provide breathtaking 3D effects through the interaction of a backlit LED TV and shutter glasses.
Miniaturized projectors need laser or LED light sources to achieve high output and brilliant colors. Panel lights as style elements are setting new standards in room lighting. Osram Opto Semiconductors will be presenting all this and much more, providing a link between the systems that already exist today and the exciting possibilities that tomorrow will bring.
The entire booth will be illuminated by 200 LED spotlights each equipped with 44 of the latest high- power LEDs in the OSLON family from Osram Opto Semiconductors. There are 22 LEDs in cold white and 22 in warm white so the lighting mood can be changed to suit particular needs. Visitors can experiment to see how the light color and brightness can be individually controlled with the aid of light emitting diodes.
“The wide variety of applications from so many different walks of life clearly shows that LEDs with their numerous benefits such as energy efficiency, long life and eco-friendly design now offer excellent options in general illumination”, said Martina Opitz, Marcom Manager at Osram Opto Semiconductors, who is responsible for the innovative booth concept.
This also applies to street lighting – various luminaires at the booth demonstrate the variety of designs and the high output levels that LEDs can deliver. A particular highlight here is a luminaire that uses Osram.
The conference room at the booth is equipped with a wall of diffused light. The one meter by two meter plastic panels looks like a transparent glass wall when they are switched off but as soon as they are switched on around 7500 OSLON SSL 80 LEDs inject their white light into the plastic. Light is therefore more than just brightness, it is a design element.
With its booth concept, Osram Opto Semiconductors is continuing its successful cooperation with the architects and designers Bachmann-Kern & Partner, who designed the booth for electronica 2008. That booth won the Gold ADAM Award in 2009.
World’s First 6-Inch Full-Field Projection Exposure System for Manufacturing LED Chips
USHIO America, a provider of specialty and general illumination lighting solutions as a wholly owned subsidiary of USHIO Inc, today announced that the company has started marketing the world’s first 6-inch full-field projection exposure system for manufacturing LED chips in the US.
For manufacturing light-emitting diodes (LEDs), exposure equipment has been used to form electrodes, electrical circuitry, and a passivation layer on a sapphire wafer used as the substrate, in the same manner as for manufacturing semiconductor devices. In general, stepper systems (step & repeat projection exposure systems) or contact exposure systems used for manufacturing semiconductors have been also used for 2-inch or 4-inch sapphire wafers.
As applications of LEDs have increased, the demand has increased dramatically while the price has been lowered significantly. In order to meet the growing need, LED chip manufacturers have increased wafer sizes from 2-inch or 4-inch wafers to 6-inch wafers in order to enhance productivity and reduce manufacturing cost by increasing the number of chips produced from each wafer.
The increase in wafer size, however, has caused such problems as a warpage or distortion of wafers that cannot be eliminated by conventional stepper or contact exposure systems, thus lowering the yield due to deposition errors. In addition, these conventional exposure systems require changes in system settings and replacement of parts for wafer size conversion. This can cause additional cost and downtime, so that it has been a challenge in technology and cost to enhance productivity by increasing wafer size.
USHIO successfully developed its new exposure system — model UX4-LEDs —that allows full-field exposure of 6-inch wafers while preventing wafer warpage or distortion, achieving a throughput enhancement of 300% compared with conventional stepper systems. The UX4-LEDs exposure system is based on the same platform as USHIO’s field- proven UX series full-field projection exposure systems for semiconductors, FPDs, printed-circuit
November/December 2010
www.compoundsemiconductor.net 169
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