maemo.org - Talk - View Single Post - The Epic Android Thread

	Capt'n Corrupt	2011-04-14 , 23:15
	Posts: 3,524 \| Thanked: 2,958 times \| Joined on Oct 2007 @ Delta Quadrant	#2906

Originally Posted by danramos

Just remember, LCD becomes dark when power is APPLIED (however little power it takes, it's still power), and clear in the absence of power. The electricity causes the crystals to align (blocking light), and when power goes away the crystals float around in any orientation, allowing light to stream through. I'm not sure I'd want my car to use up MORE power when it's turned off.

Conventionally yes, this is true. However, what actually happens is that when power is applied, the liquid crystals twist the polarity of the light (from an initially polarized bottom polarizer) such that the light and the top polarized layer have a different polarity and light is blocked from being transmitted through. It should be feasible to allow the transmission of light when power is applied by simply changing the configuration of the top polarizer (yawing it 90deg relative to the polarizer beneath the LCD)!
A great vid: http://www.youtube.com/watch?v=jiejNAUwcQ8

Even a MEMS or 'e-ink' esque solution should be possible requiring power only on a shift. Again, it's a play on polarity of light with multiple layers.

My only concern would be a loss of visibility if there was a crack in the glass!

Quote & Reply |

The Following 2 Users Say Thank You to Capt'n Corrupt For This Useful Post:
danramos, Rebski