Patent ID: 7894028
Filing Date: 2011-02-22
Classification: G02F

Abstract:
1. A liquid crystal display device that compensates residual retardation of a liquid crystal layer, comprising: (a) a first substrate; (b) a second substrate spaced away from and facing said first substrate; and (c) a twist-oriented liquid crystal layer sandwiched between said first and second substrates, said first substrate being comprised of: (a1) a first transparent substrate having a first area through which a light is allowed to pass and a second area in which a light is reflected; (a2) first to N-th 1st retardation plates arranged on said first transparent substrate at the opposite side of said liquid crystal layer, wherein N is an integer equal to or greater than 1, the first to N-th 1st retardation plates arranged in order, with the first being nearest the first transparent substrate, and the N-th being most distant from the first transparent substrate; and (a3) a first polarizer arranged on said N-th 1st retardation plate, said second substrate being comprised of: (b1) a second transparent substrate; (b2) first to N-th 2nd retardation plates arranged on said second transparent substrate at the opposite side of said liquid crystal layer, wherein N is an integer equal to or greater than 1, the first to N-th 2nd retardation plates arranged in order, with the first being nearest the second transparent substrate, and the N-th being most distant from the second transparent substrate; and (b3) a second polarizer arranged on said N-th 2nd retardation plate, wherein the liquid crystal in said liquid crystal layer is horizontally oriented relative to said first and second transparent substrates when no electric field is applied to the liquid crystal layer, and further twistingly oriented between said first and second substrates, at least one of said first 1st retardation plate arranged closest to said first transparent substrate of said first to N-th 1st retardation plates is arranged in an almost 90-degree direction, and an associated 2nd retardation plate arranged closest to said second transparent substrate is arranged in an almost 0-degree direction, wherein said 90-degree direction is defined as a direction in which liquid crystal molecules existing at a center in a thickness-wise direction of said liquid crystal layer are directed.