Pixel Qi announced the Display Solutions d-screen-Qi10:

Display Solutions AG has devel­oped the d-screen-HYBRID dri­ver board which has been com­bined with the low power, sun­light read­able Pixel Qi 10” screen. This mod­ule can be plugged into a lap­top (or even some phones) via USB for easy access to a sec­ond screen. Even bet­ter, you can skip the cables com­pletely and use this sec­ond screen via wireless-USB: mean­ing the data is sent to the screen wire­lessly and the screen runs on bat­ter­ies alone.

The specs on the 10.1-inch LCD: LED back­light, 1024×600, 262K col­ors, pure reflec­tive mode (64-level grayscale, 3072×600 pixel for­mat). That last bit I don’t get: each sub-pixel is used as a sin­gle pixel?

The wire­less option is based on DisplayLink tech­nol­ogy. There’s also the option of con­nect­ing the Pixel Qi dis­play using Ethernet, which I think is really cool. The USB con­nec­tion draws just 1.5W so no bat­tery or power adapter is required. It would cer­tainly be a cool fea­ture to have tablets be able to con­nect to note­book PCs and be used as extra dis­plays. Not as ver­sa­tile as Pixel Qi / Display Solutions, but Air Display, an app for the iPad and iPhone, allows the two gad­gets to be used as extra dis­plays. Air Display uses WiFi so any­thing other than sta­tic infor­ma­tion will be push­ing it.