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Quantum film image sensing ppt
 

Quantum film image sensing ppt

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Quantum Film Image sensing is new technology comimng in new SLR cameras

Quantum Film Image sensing is new technology comimng in new SLR cameras

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    Quantum film image sensing ppt Quantum film image sensing ppt Presentation Transcript

    • Submitted by: Saket Saurav B.Tech (ECE) 8th sem. 4th yr.
    • Introduction  InVisage Technologies, Inc , California in 2010 revolutionize new way light is captured – and announced Quantum Film.  Quantum Film image sensors are the world’s first commercial quantum dot-based image sensors, replacing silicon delivering professional camera features not yet found in mobile image sensors.
    • What is quantum film ?  Quantum film is made from materials similar to conventional film - a polymer with embedded particles.  Here the embedded particles used are quantum dots which are photo sensitive in nature.
    • Present time cameras.. what are we using ? At present , the image sensing in Digital cameras, video recorder and in some DSLRs are done with CCD or CMOS techniques. These technologies brought a revolution in digital imaging since after 1982 , when they were available to consumers.
    • CCD image sensor is an analog device. When light strikes the chip. It generates as a small electrical charge in each photo sensor which then are converted to voltage and they are read from the chip.
    •  CMOS imaging chip is a type of Active Pixel Sensor made using the CMOS semiconductor process.  They contain array of image pixels in horizontal and vertical manner, which senses light when it falls on them.  Additional circuitry in the camera converts the voltage into digital information.
    • Improvement is required .. .  CMOS based image sensors record images sequentially from top to bottom, line by line. As a result, different parts of a picture are taken at different times.  It is called “Rolling Shutter Effect” ,due to which sometimes a tilted form of image is obtained.  Even long term exposure of CMOS image sensors reduces its lifecycle and image quality.
    • Rolling shutter effect : CMOS Image Sensor Quantum Film Image Sensor
    • Quantum film ---Future requirement  Quantum films can sense scenes and images at much higher pixel resolutions.  They prove to be four times more sensitive than the finest grained photographic film.  Quantum Film was designed to absorb 100% of the light we see with our own eyes.
    • How it all work ?? Losses 50% during detection F2x light detection 2x better efficiency
    • Traditional image sensors In Traditional image sensors, incident light is absorbed by the silicon chip after passing through many metal layers. Due to lower based structure ,only fraction of incident light is received at the silicon chip.  Losses almost 50% of incident light , hence efficiency decreases.  Image resolution is affected.
    • Quantum film image sensors  100% of the area of each digital pixel is covered in strongly– light–absorbing film.  And, at the same time, 100% of each pixel is also available to the silicon beneath for converting it into Digital image with much high resolution.
    •  Quantum Film image sensors enable more compact lenses because of its top surface architecture.  This means shorter lenses can be used without any degradation in performance.  Instant Shutter ,built for quantum films ,allows the entire image to be exposed at precisely the same time, leading to distortion-free stills and video.
    • Moving on to thinner phones  Traditional Silicon based image sensors, making the camera thinner by reducing the lens height produces crosstalk between pixels.  Quantum Film is a highly absorptive and an extremely thin layer of material. The lens height continues to be reduced the electrons are still captured in the correct pixel even as the lens height is continuously decreased.
    • Conclusion  Quantum Film is ideal for a wide range of image- sensing technologies including security cameras, automotive cameras and military applications.  The first Quantum Film image sensors, targeting high-end mobile handsets and smart phones.  The first target market for Quantum Film is mobile handsets, where there is the greatest demand for small, high performance image sensors.