Back in 1982, Sony came out with the 'Watchman', a flat panel black and white TV that was 7 inches by 3 inches, with a 1 3/4 inch screen and weighed about 22 ounces. It hit the US two years later, in 1984. It was amazing for its time.
Sony also had the 'Walkman' portable music player that you could carry with you. It came out in 1979.
Apple just took those concepts a few steps further with it's iPad, which combines TV, music, and computer technology in roughly the same size package. It just took 30 years for smaller, faster technology to catch up. I can hardly wait for the next 10 years, when all of this technology will be placed in a pair of glasses, and voice controlled.