The Exilim EX-ZR400 supports a maximum video resolution of 1920 x 1080 pixels. That's over two times the video resolution of the most common video resolution of 1280 x 720 pixels. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
This camera's video resolution (1920 x 1080 pixels) is actually the best supported video resolution across all digital cameras that have been on the market for a comparable time to the Exilim EX-ZR400.
A 320 x 240 pixels video resolution is the worst supported video resolution amongst similar types of camera.