The present invention provides a liquid crystal display and pixel displaying structure thereof. The pixel displaying structure has a plurality of sub-pixel units. The sub-pixel units are arranged on a two-dimensional matrix arrangement and each of the sub-pixel units is divided into two rectangular partitions, and each of the partitions performs a bright mode or a dark mode, and then the bright mode and the dark mode are changed over to each other between consecutive frames of screen while two transversely-adjacent or longitudinally-adjacent partitions are a combination of a bright-mode partition and a dark-mode partition. Therefore, ladder-like bright-dark boundary line appearing during displaying oblique lines can be reduced based on the visual mixture of brightness interchanging.