5 ms·

This video camera is powered by light

82 points by praba230890 12y ago

dang 12y ago
URL changed from http://www.engadget.com/2015/04/15/self-powered-camera/ http://www.engadget.com/2015/04/15/self-powered-camera/, which points to this.
Globz 12y ago
This is very interesting! "it could lead to a fully self-powered solid-state image sensor that produces a useful resolution and framerate" In this case would it be able to output colors?
- danbruc 12y ago
  Color just means putting red, green and red filters in front of the pixels in some pattern and so it is definitely not a principle problem but you will lose a large part of the light spectrum for every pixel and therefore harvest a lot less energy.
  - indrax 12y ago
    In theory, you could put the filters on for just a fraction of the time to measure the colors, and spend most of the time collecting all the light. I'm not sure how to do that and stay low power. You could have separate smaller color sensing pixels, using only a fraction of the surface area. ETA: There are also transparent solar panels which only absorb UV. If that were tuned for visible colors, you could have three transparent layers over an ordinary panel, and maybe not lose anything.
  - sounds 12y ago
    Use a lens and prism to gather incoming photons, split by wavelength, then harvest and record their intensity.
ctdonath 12y ago
As we go increasingly wireless, we become keenly aware of recharging batteries. Consequence is greater interest in "ambient power harvesting". A device powered by its own sensor's energy input is insightful. What next? keyboards powered by typing? trackpad/mouse by clicking & movement? Screens with an extra sub-pixel for light collection? Smart watch "self-winding"?
- pjc50 12y ago
  Backlit screens and backlit watches are never going to be self-powered. It's more feasible that a passive e-paper like display could be self-powered.
  - ctdonath 12y ago
    They can at least reduce total power, and perhaps store power when not in use.
  - mfisher87 12y ago
    Depends on how you define the phrase "self-powered." Today, an "electric-powered" car may not necessarily mean to the exclusion of gasoline as an additional power source. If a backlit device harvests the unused light from its own backlight, it would surely be powered by itself. Not _purely_, but it would be harvesting its own outputs for energy.
    - MrBra 12y ago
      Unused light? What did you mean by that? Fueling an electric car with gasoline has has nothing to do with self powered ambient harvesting machines. It looks like you're just trying to stretch concepts to suit your initial arguments.
      - mfisher87 11y ago
        I apologize for not responding sooner. LCD displays operate by partially blocking or completely blocking the backlight to produce an image. The blocked backlight photons are not used to generate the image. As opposed to a CRT or OLED display, which generate light to produce an image. What original argument? This is my only comment on this thread. My point was that "X-powered" does not mean "powered-solely-by-X."
amelius 12y ago
Can it also be used to power other electronics attached to it, such as a CPU?
grogenaut 12y ago
That's the elegant solution I love about welding equipment. They realized hrm super bright light source.... lets use solar cells. Need just enough power in battery form to keep the micro alive. Been doing it since way back in the '90s.
njharman 12y ago
Combine this with the recent millimeter scale computer motes http://robotics.eecs.berkeley.edu/~pister/SmartDust/ http://robotics.eecs.berkeley.edu/~pister/SmartDust/ and we get real close to several sci-fi themes such as optical camouflage and universal panopticon.
- abecedarius 12y ago
  What happened to make http://robotics.eecs.berkeley.edu/~pister/SmartDust/in2010 http://robotics.eecs.berkeley.edu/~pister/SmartDust/in2010 so wildly off? Did those projections seem realistic 10 years before? Is it just taking a little longer?

82 points by praba230890 12y ago

dang 12y ago

URL changed from http://www.engadget.com/2015/04/15/self-powered-camera/ http://www.engadget.com/2015/04/15/self-powered-camera/, which points to this.

Globz 12y ago

This is very interesting! "it could lead to a fully self-powered solid-state image sensor that produces a useful resolution and framerate" In this case would it be able to output colors?

danbruc 12y ago
Color just means putting red, green and red filters in front of the pixels in some pattern and so it is definitely not a principle problem but you will lose a large part of the light spectrum for every pixel and therefore harvest a lot less energy.
- indrax 12y ago
  In theory, you could put the filters on for just a fraction of the time to measure the colors, and spend most of the time collecting all the light. I'm not sure how to do that and stay low power. You could have separate smaller color sensing pixels, using only a fraction of the surface area. ETA: There are also transparent solar panels which only absorb UV. If that were tuned for visible colors, you could have three transparent layers over an ordinary panel, and maybe not lose anything.
- sounds 12y ago
  Use a lens and prism to gather incoming photons, split by wavelength, then harvest and record their intensity.

ctdonath 12y ago

As we go increasingly wireless, we become keenly aware of recharging batteries. Consequence is greater interest in "ambient power harvesting". A device powered by its own sensor's energy input is insightful. What next? keyboards powered by typing? trackpad/mouse by clicking & movement? Screens with an extra sub-pixel for light collection? Smart watch "self-winding"?

pjc50 12y ago
Backlit screens and backlit watches are never going to be self-powered. It's more feasible that a passive e-paper like display could be self-powered.
- ctdonath 12y ago
  They can at least reduce total power, and perhaps store power when not in use.
- mfisher87 12y ago
  Depends on how you define the phrase "self-powered." Today, an "electric-powered" car may not necessarily mean to the exclusion of gasoline as an additional power source. If a backlit device harvests the unused light from its own backlight, it would surely be powered by itself. Not _purely_, but it would be harvesting its own outputs for energy.
  - MrBra 12y ago
    Unused light? What did you mean by that? Fueling an electric car with gasoline has has nothing to do with self powered ambient harvesting machines. It looks like you're just trying to stretch concepts to suit your initial arguments.
    - mfisher87 11y ago
      I apologize for not responding sooner. LCD displays operate by partially blocking or completely blocking the backlight to produce an image. The blocked backlight photons are not used to generate the image. As opposed to a CRT or OLED display, which generate light to produce an image. What original argument? This is my only comment on this thread. My point was that "X-powered" does not mean "powered-solely-by-X."

amelius 12y ago

Can it also be used to power other electronics attached to it, such as a CPU?

grogenaut 12y ago

That's the elegant solution I love about welding equipment. They realized hrm super bright light source.... lets use solar cells. Need just enough power in battery form to keep the micro alive. Been doing it since way back in the '90s.

njharman 12y ago

Combine this with the recent millimeter scale computer motes http://robotics.eecs.berkeley.edu/~pister/SmartDust/ http://robotics.eecs.berkeley.edu/~pister/SmartDust/ and we get real close to several sci-fi themes such as optical camouflage and universal panopticon.

abecedarius 12y ago
What happened to make http://robotics.eecs.berkeley.edu/~pister/SmartDust/in2010 http://robotics.eecs.berkeley.edu/~pister/SmartDust/in2010 so wildly off? Did those projections seem realistic 10 years before? Is it just taking a little longer?