US 12,487,487 B2
Transflective liquid crystal display device
Kouichi Watanabe, Kameyama (JP); and Shinichi Terashita, Kameyama (JP)
Assigned to Sharp Display Technology Corporation, Kameyama (JP)
Filed by Sharp Display Technology Corporation, Kameyama (JP)
Filed on Jul. 8, 2024, as Appl. No. 18/765,408.
Claims priority of application No. JP2023-130129 (JP), filed on Aug. 9, 2023.
Prior Publication US 2025/0076703 A1, Mar. 6, 2025
Int. Cl. G02F 1/1335 (2006.01); G02F 1/1333 (2006.01); G02F 1/13363 (2006.01); G02F 1/1343 (2006.01)
CPC G02F 1/133555 (2013.01) [G02F 1/133371 (2013.01); G02F 1/13338 (2013.01); G02F 1/133531 (2021.01); G02F 1/133638 (2021.01); G02F 1/134309 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A transflective liquid crystal display device comprising a liquid crystal display device provided with a plurality of pixels, the liquid crystal display device comprising:
a first polarizer; a first phase difference layer; a first substrate; a liquid crystal layer; a second substrate; a second phase difference layer; and a second polarizer in this order from a back face side toward an observation face side,
wherein the first substrate includes a reflective layer, a pair of electrodes configured to generate 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 first phase difference layer includes a first λ/2 plate and a first λ/4 plate that are arranged in this order from the back face side,
the second phase difference layer includes a second λ/2 plate, a first positive C plate, and a second λ/4 plate that are arranged in this order from the observation face side,
the liquid crystal layer includes a liquid crystal material having a negative-type anisotropy of dielectric constant and takes a twist alignment when no voltage is applied, and
each of the plurality of pixels includes a reflective region in which light from the observation face side is reflected by the reflective layer to perform display and a transmissive region in which light from the back face side is transmitted to perform display.