US 12,405,498 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. 1, 2024, as Appl. No. 18/760,063.
Claims priority of application No. 2023-130128 (JP), filed on Aug. 9, 2023.
Prior Publication US 2025/0053044 A1, Feb. 13, 2025
Int. Cl. G02F 1/1335 (2006.01); G02F 1/1333 (2006.01); G02F 1/13363 (2006.01); G02F 1/1343 (2006.01); G02F 1/139 (2006.01)
CPC G02F 1/133555 (2013.01) [G02F 1/133371 (2013.01); G02F 1/133541 (2021.01); G02F 1/133638 (2021.01); G02F 1/134309 (2013.01); G02F 1/1396 (2013.01)] 16 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 an 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, a first λ/4 plate, a first positive C plate, and a second positive C plate,
the second phase difference layer includes a second λ/2 plate, a second λ/4 plate, a third positive C plate, and a fourth positive C plate,
the liquid crystal layer takes a twist alignment when no voltage is applied,
each of the plurality of pixels includes a reflective region in which light is reflected by the reflective layer to perform display and a transmissive region in which light is transmitted to perform display,
the first positive C plate is located between the first λ/2 plate and the first λ/4 plate, and the third positive C plate is located between the second λ/2 plate and the second λ/4 plate, and
the second positive C plate is located between the first λ/2 plate and the first polarizer, and the fourth positive C plate is located between the second λ/2 plate and the second polarizer.