Patent ID: 9104037
Filing Date: 2015-08-11
Classification: G02B,G02F

Abstract:
1. A liquid crystal display device, comprising: a first polarizer; a first λ/4 plate with an in-plane phase difference adjusted to λ/4; liquid crystal cells including a liquid crystal layer between a pair of opposing substrates; a second λ/4 plate with an in-plane phase difference adjusted to λ/4; and a second polarizer, in this order, wherein when an azimuth angle of an absorption axis of the second polarizer is defined as 0°, an in-plane slow axis of the second λ/4 plate forms an angle of approximately 45°, an in-plane slow axis of the first λ/4 plate forms an angle of approximately 135°, the absorption axis of the first polarizer forms an angle of approximately 90°, and wherein a display brightness is varied by changing an alignment state of liquid crystal molecules in the liquid crystal layer from a state where the liquid crystal molecules are approximately vertically aligned over a substrate surface, to a state where the liquid crystal molecules are tilted over the substrate surface; the liquid crystal layer includes a domain in which the liquid crystal molecules are tilted in an azimuth angle range of 12.5° to 32.5°, a domain in which the liquid crystal molecules are tilted in an azimuth angle range of 102.5° to 122.5°, and a domain in which the liquid crystal molecules are tilted in an azimuth angle range of 192.5° to 212.5°, and a domain in which the liquid crystal molecules are tilted in an azimuth angle range of 282.5° to 302.5°; the liquid crystal layer does not include a domain in which the liquid crystal molecules are tiled in an azimuth angle range of 45°, a domain in which the liquid crystal molecules are tilted in an azimuth angle range of 135°, a domain in which the liquid crystal molecules are tiled in an azimuth angle range of 225°, and a domain in which the liquid crystal molecules are tilted in an azimuth angle range of 315°; and wherein a birefringent layer satisfying nx>ny≧nz is defined as a first-type birefringent layer, and a birefringent layer satisfying nx<ny≦nz is defined as a second-type birefringent layer, the first and second λ/4 plates are first-type birefringent layers having approximately the same Nz-coefficients, and the second-type birefringent layer is provided between the second λ/4 plate and the second polarizer, one surface of the second-type birefringent layer is adjacent to the second λ/4 plate, another surface of the second-type birefringent layer is adjacent the second polarizer, and an in-plane fast axis of the second-type birefringent layer is approximately orthogonally crossing the absorption axis of the second polarizer.