How to dim a computer screen... without anything that interacts with the device!

The answer to the riddle in the title will be obvious but I thought it would be a good example of this physical property. Which property? I'm sure someone will find out. If not I'll modify this description at a later date to give the answer....

Category:

Science & Technology

Tags:

• LCD screen. shutdown
• polarisation

[xtmedia]

How do you think it was done? Try to guess in the comments here!

The answer will come in about a month or two.

[jlrya]

CPL?

[ODLoutzenheiser]

I say you are using an ambient light sensor, where all you need to do to dim the screen is mover your hand in front of it, without actually touching it.

K.