Most recent flat screen LCD TV's come with an HDMI cable to ensure the viewer is able to hook up an HDTV cable box or TV attenae. Optional cords such as VGA cables generally cost extra
Yes, Sony most certainly produce and make flat lcd televisions. They come in an array of screen sizes. You can locate them at most electronic retail outlets such as Best Buy.
While there is some prestige value to owning a Sony over a Samsung flat lcd TV, as Sony flat lcd TV isn't a better TV. A Sony plasma TV is a better TV in some ways than flat lcd TVs, but the like...
Do a little research on google and yahoo under "flat screen tv history" and find the answer. Wikipedia states that it was developped since early 1930's.