How about a TV or computer screens that channels daylight via mirrors to the screen so it is used as the primary source of light? The technology required would have to darken / allow more light through for each pixel and somehow filter the light with colour depending on the colour of the pixel. Very extravagant and probably very expensive but something that could be fitted into new homes if it was workable. At dusk / night obviously artificial light sources would have to kick in. Maybe way too much effort for its worth with OLED screens coming along, but you cant beat natural daylight huh?
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Edit: Probably something more suited to cinemas if it could work!
this could easily be done with lcd screens, an lcd panel is basically just a filter for the white light panel behind it, so if you opened up an lct tv, and put the screen in front of a window, it would probably work fine, but i doubt you would benefit at all, the light is less controlled, you would save very little power, and as you said you would still need a light source to use at night, not to mention that your idea of using a channel of mirrors, i assume from a skylight or such, would make the tv a permanent, and rather large structure, taking you back, basically, to the bulky crt screen.
When I first designed outdoor kiosks, we used 'transflective' LCD displays, which would only have a brightness of 40 foot lamberts by themselves, but the light from outside would go through them and bounce off the reflector to add to the useable light output.
unfortunatley, they were nearly impossible to read in dawn and dusk hours. Night was good.
If you could somehow do this daylight bit with one of those solar tubes and not have to aim it at the sun, you could probably get away with it. But just like my transflective display, like you said, you'd still need a light source. Maybe way too much effort to save a few watts.
Reminds me of the ending of the movie "Legend."