Multi domain vertical alignment liquid display and a substrate thereof

A lower substrate of a multi-domain vertical alignment LCD, adapted to be placed beneath an upper substrate and assembled with the upper substrate, while with liquid crystal sandwiched therebetween, the upper substrate comprising an upper electrode and a color filter layer, the color filter layer being disposed with a first color dyestuff and a second color dyestuff, the first color dyestuff and the second color dyestuff being selected from an optional combination of red, green and blue dyestuffs, the lower substrate comprising:

• a plurality of gate lines;
• a plurality of source lines;
• a plurality of coupling electrode lines, a voltage being applied respectively thereon;
• and
• a plurality of pixels, each of the pixels comprising a first large sub-pixel, a first small sub-pixel, a second large sub-pixel and a second small sub-pixel, in which the first large sub-pixel and the first small sub-pixel correspond to the first color dyestuff, and the second large sub-pixel and the second small sub-pixel correspond to the second color dyestuff, and in which the first small sub-pixel is adjacent to the first large sub-pixel and the second small sub-pixel is adjacent to the second large sub-pixel, the first large sub-pixel comprising a first switch element, a first coupling electrode and a first large pixel electrode, in which the first coupling electrode is electrically connected to the first large pixel electrode, the first small sub-pixel comprising a second switch element, a second coupling electrode and a first small pixel electrode, in which the second coupling electrode is electrically connected to the first small pixel electrode, the second large sub-pixel comprising a third switch element, a third coupling electrode and a second large pixel electrode, in which the third coupling electrode is electrically connected to the second large pixel electrode, the second small sub-pixel comprising a fourth switch element, a fourth coupling electrode and a second small pixel electrode, in which the fourth coupling electrode is electrically connected to the second small pixel electrode, the gate lines and the source lines being respectively connected to the switch elements, in which the first large sub-pixel is arranged to be aligned side by side with the second large sub-pixel and the first small sub-pixel is arranged to be aligned side by side with the second small sub-pixel,
• wherein the overlapping size of the first coupling electrode and the coupling electrode lines is unequal to the overlapping size of the third coupling electrode and the coupling electrode lines, and the overlapping size of the second coupling electrode and the coupling electrode lines is unequal to the overlapping size of the fourth coupling electrode and the coupling electrode lines.