The study of bent-core biaxial nematic phase predicted with D2h symmetry has been focused recently. The biaxial nematic phase was revealed by x-ray diffraction patterns(1 and was proved by H NMR spectroscopy(2 method in the previous studies. In this paper, we have applied for different techniques to show the biaxiality using the same liquid crystal (LC) mesogens shown in the references, 4,4'(1,3,4-oxadiazole-2,5-diyl)-di-p-heptylbenzoate (ODBP-O-C7), which has been re-synthesized by our group. The optical and simulation results such as viewing angle and contrast ratio obtained from various LC modes will give a clue of biaxiality. We will explain our results to show the biaxiality. We will also discuss electro-optical results obtained from in-plane switching (IPS) and pattern vertical alignment (PVA) modes. We think that a kind of biaxial nematic LC will be best candidate in LCs for future LCD application needed fast response time and color reappearance. This research was supported by a grant(F0004130) from Information Display R&D Center, one of the 21st Century Frontier R&D Program funded by the Ministry of Commerce, Industry and Energy of Korean government and by the Brain Korea 21 Project in 2006.

Reference 1) S. Kumar et al., Phys. Rev. Lett. 92, 145506 (2004). 2) E. T. Samulski et al., Phys. Rev. Lett. 92, 145505 (2004).