TV and monitor maker ViewSonic on Tuesday introduced six new LCD HDTVs, ranging from a 20-inch set that can double as a computer monitor to a 42-inch HDTV. Starting from smallest to largest, the 20-inch VT2042 has a resolution of 1600x900, the 23-inch VT2342 gets a 1920x1080 screen while the VT2645 has 1366x768 pixels in its display.