Black characters are getting more air time on the small screen, but they continue to be relegated to sitcoms, a UCLA study found. "Despite the large number of African-Americans on television, they continue to be 'ghettoized,'" the study said. The situation for Hispanics, meanwhile, was far worse: They're the most underrepresented group in prime time, accounting for just 2 percent of all characters. Asian-Americans comprised about 3 percent, and American Indians were "invisible."