Tue, Mar 23, 2010 - Page 11 News List

Technology leap forecast for cameras in cellphones

SENSING DEVELOPMENT InVisage Technologies thinks its new semiconductor material will provide better light than today’s silicon and so provide better performance


Mobile photographers could soon have much better cameras on their cellphones, thanks to technology known as quantum dots.

InVisage Technologies, based in Menlo Park, California, has spent more than three years trying to build a proprietary film that coats the image sensors used in cellphones cameras and allows them to capture more light. The film stands as a rare commercial use of an exotic semiconductor material called a quantum dot.

Jess Lee, the chief executive of InVisage, said the firm’s lab tests had convinced him that within two years cellphones companies would be able to offer cameras that work about four times better than today’s cameras, particularly in low light.

The image sensors in cellphones cameras use silicon to capture light, which is then processed to create a picture. Companies making these sensors have run into problems as they keep shrinking and tweaking the innards of the devices so that they can absorb more light.

The limitations of cameras based on this technology often appear when people try to take photos in low light, resulting in a blurry image.

“With the current techniques, you might have technology that’s 10 percent better two years from now,” Lee said. “The big guys have hit a brick wall, and it will only get harder and more expensive for them to fight it.”

Rather than trying to refine the silicon technology, InVisage turned to quantum dots to build what it calls Quantum Film, a layer of semiconductor material that gathers light better than silicon, Lee said.

Researchers have spent years working on quantum dots with little success. They are essentially semiconductor particles about a nanometer — or a billionth of a meter — in size. Technologists want to control the physical properties of the quantum dots to make them behave a certain way.

Typically, researchers must build the quantum dots with exotic materials and then struggle to control their properties in a repeatable fashion.

Morry Marshall, the vice president for strategic technologies at the chip consulting firm Semico Research, said that if InVisage had figured out how to use quantum dots effectively, it could mean a huge leap in camera performance.

“I don’t know of any technology right now that is even close,” Marshall said.

Lee declined to reveal what materials InVisage had used to build its dot, calling it the company’s secret recipe. He did, however, show off vials of the quantum dots suspended in a liquid. The liquid is spread across the top of an image sensor. Lee expects that companies producing image sensor chips could use the film without substantial changes to their existing equipment.

Rather than licensing the film to companies like Sony, Toshiba or Aptina, InVisage plans to make its own sensors and sell them directly to cellphones companies.

“We expect to start production 18 months from now,” Lee said.

With such technology, the current 3-megapixel camera found in the Apple iPhone could be turned into a 12-megapixel camera that works better in varying light conditions, Lee said.

Ken Salsman, the director of new technologies at Aptina, a major manufacturer of image sensors for cellphones, said silicon-based sensors had proved tough to advance. But he said that Aptina had managed to improve its technology through some novel techniques, and that InVisage might be “in for a very rude surprise.”

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