SMS Notification on screen when screen is "off"

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I'm no developer so i have really no idea if this would work.

But, as this mobile is a AMOLED screen, each pixels are lighted up and so not much battery is drained on a black screen.

What if we could somehow make something when a new sms has not been read and screen turns of, a black screen like this appears

Is something like this possible?

pic example, could even be smaller or just 1 blinking pixel.

http://forum.xda-developers.com/showthread.php?t=706426

I think to display a message on screen the machine would need to be awake, so it would be using more power than with an led notification (afaik the device can normally go to sleep then).

Your idea would still save power over just showing the lock screen though because you are right that using fewer pixels would proportionally reduce power usage of the screen.

I guess the hardest part would be making the device appear off - It would need to ignore screen and button touches (except power).