Knockr is a new (and free) Android application that enables lock-screen gestures. The idea is that you can setup your phone so that a certain gesture opens a specific application. Knockr only works on devices with OLED screens - because it actually does not turns-off the display on the lock screen, it simply turns it black. On an LCD display, there will be a significant battery drain...

As more and more phones adopt OLED displays, we can expect software to take advantage of the OLED features. In the past few weeks we've seen two interesting patents (here and here) that detail innovative ways to save power on OLED displays.

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Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs