CL1B power distribution

James Cameron quozl at
Tue Apr 28 19:19:15 EDT 2009

On Tue, Apr 28, 2009 at 10:15:47AM -0400, C. Scott Ananian wrote:
> I wonder if one could easily support running an LED backwards as an
> ambient light monitor in Gen 1.5 - it seems that automatically
> powering off the backlight in bright sunlight would lead to a lot of
> power savings for most young users.

I agree that an ambient light detector and automatic adjustment of
backlight would save power.  It would happen transparently, magically.

But I don't think the LEDs are often specified in terms of their ambient
light detection properties.

Perhaps it would be better to use a photodiode, or light dependent

Then there's the spectrum of light being received.

Then there's reflection from the laptop display itself to consider.

I recall we also once had a discussion on whether the camera could be
used as an ambient light detector.

James Cameron    mailto:quozl at

More information about the Devel mailing list