The sensor receives three times as much light as normal

University of Utah engineers invented a new type of filter that is very small in size but has the potential to increase the amount of light passing three times the normal filter. When using this type of filter with the camera of the phone, the image sensor will receive more light, higher sharpness, better color reproduction in low light conditions.

Newly developed filter adopts 3x normal light

Most image sensors now use a Bayer arrangement with alternating green, blue, and red dots. Light before entering the sensor will be a layer of filter "divided" three colors in order for the sensor can handle. As this filter reduces the amount of light entering the sensor to only 60-70%, Professor Rajesh Menon of the University of Utah has created a new, thinner, more transparent glass that gives more light. quality and quantity.

This filter is a few micrometers thin (100 times thinner than human hair) and is etched on one surface with precision and purpose (see illustration). Thanks to this thinness, combined with low diffraction, this glass gives three times the amount of light passing through the lens. With special texture engraved on one side, instead of dividing the light into 3 colors like a traditional filter, this new filter gives 25 new colors, or more passes. About two-thirds of the spectrum is absorbed to reproduce three more exact colors, so that the final image will have more accurate colors.

Although this type of filter can be applied on any digital camera, Menon is still concentrating on developing this type of filter for the camera phone, which is lacking in brightness due to physical limitations. In addition, this filter will also be used in other industries such as security cameras, control planes, robots, etc. Mr. Menon said it would take at least another three years, the product This is new in the market.