3-DIMENSIONAL SIMULATION OF MULTI-DOMAIN VERTICALLY ALIGNED LIQUID CRYSTAL DISPLAYS WITH DIELECTRIC RIBS

초록

In this paper, we performed 3-dimensional simulation of multi-domain vertically aligned liquid crystal displays (MVA-LCDs) with dielectric ribs and analyzed the effects of various design and material parameters on the electro-optical characteristics. The cell used in the calculation is composed of 4 domains divided by dielectric ribs vertically formed on the upper and lower substrates. Because the ribs have half the thickness of a cell gap, the intersections of the ribs serve even as spacers to maintain the cell gap. Moreover, to describe realistic situation more precisely, data and gate bus lines are considered in the simulation. To obtain the dynamic motion of the 3-dimensional director distribution of liquid crystals, we used Ericksen-Leslie equation and strain energy density represented by tensorial form for anisotropic elastic constants. In summary, it is theoretically clarified that 4 domains are formed by the fringe fields established along the dielectric ribs crossing each other on the center of a pixel. To obtain wide viewing angle and fast response time, and high contrast ratio, we also present the optimum conditions for designing the MVA-LCDs with dielectric ribs.