The Sony DSC-TX20 supports a maximum video resolution of 1920 x 1080 pixels. That's over two times the video resolution of a 1280 x 720 pixels digital camera, which is the most common video resolution supported by digital cameras of a similar spec and age to the DSC-TX20. 1280 x 720 pixels is also supported by this Sony camera. In addition, this camera support a video resolution of 640 x 480 pixels and 1440 x 1080 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 amongst all digital cameras of this spec and age.
The worst supported video resolution across comparable types of camera is 320 x 240 pixels.