kung hindi supported 720p or 1080p then that could mean the resolution the tv uses is 720x480 (default DVD resolution). talagang pangit ang resolution na makikita mo, gx660 full HD resolution nyan diba (1920x1080)
kung bibili ka naman ng computer monitor make sure na supported ang resolution na 1920x1080 (although most 22 inches computer monitor should be able to output to 1920x1080). tingnan mo rin ang connectivity options ng monitor. make sure merong HDMI kung HDMI ang gagamitin mo (if memory serves right ang nasa gx660 is VGA and HDMI)