When most people see the THX logo, they think sound. And understandably so, given that said logo is in pretty much every theater and stamped onto a slew of higher-end audio products. But, contrary to popular belief, THX can also relate to video, though apparently getting certification for your HDTV costs a pretty penny. After posting stellar results for its most recent quarter, LG Electronics has introduced its first-ever THX-Certified display in the US market, and none of the three are anywhere close to “cheap.”The