A liquid crystal display module includes a liquid crystal panel, a bottom cover having a plurality of lamps installed thereabove, a reflection sheet for reflecting the light generated from the lamps and a main support having openings in which the lamps are inserted, an extension part extending from the openings, and a supporting member for supporting the liquid crystal panel. As such, the secondary reference equals a known, fixed portion of the primary reference, thereby minimizing distortion due to variations in voltage ratio. The membrane of the invention displays a significantly improved fracture toughness with virtually unchanged swelling behavior.