A battery pack having an improved a coupling force between a battery cell and a connecting bar of a connecting structure. A lift height sensor assembly has a pulse generator and a sensor unit. At least a portion of the second ends of the plurality of nanostructures, in this embodiment, are bent toward one another to form two or more similarly configured clumps each including two or more nanostructures. Both of the liquid crystal molecules positioned in the first region and the second region are oriented either vertically or horizontally when the pair of substrates is viewed in the front direction, and are oriented obliquely with respect to the substrate surface and symmetrically of each other when the pair of substrates is viewed in the cross-sectional direction. At least one section from the plurality of sections including at least one policy preference. Accordingly, a main seal and dummy seals having the same thickness produce uniform liquid crystal cell gaps.