US 12,147,124 B2
Liquid crystal display device having an improved contrast ratio
Shinichi Terashita, Kameyama (JP); Kouichi Watanabe, Kameyama (JP); and Fumikazu Shimoshikiryoh, Kameyama (JP)
Assigned to Sharp Display Technology Corporation, Kameyama (JP)
Filed by Sharp Display Technology Corporation, Kameyama (JP)
Filed on Oct. 11, 2023, as Appl. No. 18/378,841.
Claims priority of application No. 2022-185662 (JP), filed on Nov. 21, 2022.
Prior Publication US 2024/0168339 A1, May 23, 2024
Int. Cl. G02F 1/13363 (2006.01); G02F 1/1333 (2006.01); G02F 1/1335 (2006.01); G02F 1/1337 (2006.01); G02F 1/1343 (2006.01); G02F 1/139 (2006.01); G02F 1/137 (2006.01)
CPC G02F 1/133638 (2021.01) [G02F 1/13338 (2013.01); G02F 1/133531 (2021.01); G02F 1/133553 (2013.01); G02F 1/133636 (2013.01); G02F 1/133738 (2021.01); G02F 1/134372 (2021.01); G02F 1/13439 (2013.01); G02F 1/1398 (2021.01); G02F 1/133528 (2013.01); G02F 1/13706 (2021.01); G02F 1/13712 (2021.01); G02F 2203/02 (2013.01); G02F 2203/09 (2013.01); G02F 2203/64 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A liquid crystal display device, comprising:
a first substrate;
a second substrate disposed on a viewer side relative to the first substrate;
a liquid crystal layer provided between the first substrate and the second substrate;
a polarizer disposed on a viewer side relative to the liquid crystal layer;
a phase difference layer disposed between the polarizer and the liquid crystal layer; and
a plurality of pixels arrayed in a matrix shape,
wherein the first substrate includes:
a reflective layer configured to reflect light,
a first electrode and a second electrode capable of generating a transverse electrical field in the liquid crystal layer, and
a first horizontal alignment film in contact with the liquid crystal layer,
the second substrate includes a second horizontal alignment film in contact with the liquid crystal layer,
the liquid crystal layer takes a twist alignment when no voltage is applied,
the liquid crystal layer contains a liquid crystal material of positive-type,
the phase difference layer includes a λ/2 plate, and
an angle θ3, formed by a slow axis of the λ/2 plate with an orientation direction of a liquid crystal molecule defined by the first horizontal alignment film in a twist direction of the liquid crystal layer, is in a range from 132.4° to 143.6°.