2. 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.
3. 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.
4. 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.
5. 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.
6.
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.
7. 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.
9. 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.
10. How it all work ??
Losses
50%
during
detection
F2x light detection
2x
better efficiency
11. 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.
12. 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.
13. 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.
14. 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.
15. 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.
