Take a look at this remarkable video demonstrating the new OLED display from Panasonic that doubles as a completely transparent window.
(Transparent OLED TV By Panasonic)
Panasonic has shown off a transparent TV before, but the company has since improved the image quality to the extent that the idea of a television built into your furniture's glass panes is not only possible -- it's right here. The OLED screen is made from a fine mesh, embedded into the glass sliding door. While the TV image is visible even with the backlighting on, once it's dimmed the image is clear and bright enough to be almost indistinguishable from existing televisions. (The last model was a bit too dim, and required under-shelf lighting to boost the image.) Turn the TV panel off, however, and it's hard to tell it was ever there to begin with.
Take of a look at the screen capture below from Wells' prophetic 1936 film Things to Come. In the film created by Wells, technologically advanced societies of the future will make use of widescreen transparent flat panel technology (see more pictures).