So, if you read more you're less likely to be depressed. It seems more like a correlation between TV and unhappiness rather than causation, but I'm open to the idea that TV can make you unhappy. My wife thinks the blitz of images and advertising on TV can cause people to want things and lifestyles that are unrealistic and often unobtainable. I'm not so sure about that, but it is something to think about.
Another, more science focused source: Unhappy People Watch Lots More TV
BTW, I don't really watch TV at all. I did see the Presidential debates this year because I thought this election was very important, but otherwise I haven't seen a general TV shows since 1997. I've seen bits of TV when I'm in a room with other people who are watching, but I don't turn the TV when I'm alone and don't know anything about the current dramas or series out there.