🚀 go-pugleaf

In article <PAUSCH.89Sep22174506@ra.cs.Virginia.EDU>, pausch@ra.cs.Virginia.EDU (Randy Pausch) writes:
> 
> A student is interested in looking at variable-intensity L.E.D displays for
> consumer electronics (i.e. your clock radio knows how bright to make itself,
> based on the ambient light in the room).  Does anyone know if
> 
> a) this is already marketed in a commercial project?

My clock radio has a day/night switch that reduces the intensity of the
display.  It does not sense the room light automatically, but this seems
like a logical next step.

> b) any R&D work has been done in this area?

I don't think there is anything particularly difficult about building
variable intensity LEDs.  Reducing the current (i.e. greater series resistance)
should do it.  Pulsing the display and varying the duty cycle is another
alternative that might lend itself better to a digital implementation.

-- 
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