LIQUID CRYSTAL DISPLAY DEVICE

• US 20160170263A1
• Filed: 02/25/2016
• Published: 06/16/2016
• Est. Priority Date: 08/28/2013
• Status: Active Grant

• Current Assignee: Harvest Croo, Llc
• Original Assignee: Ortus Technology Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: KOBAYASHI, Kunpei, MIZUSAKO, Ryota, ARAI, Norihiro
• Granted Patent: US 10,025,137 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/133742 for homeotropic alignment
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
• CPC Class Codes: G02F 1/13706 the liquid crystal having positive dielectric anisotropy

Abstract

A liquid crystal display device includes: a first substrate and a second substrate; a liquid crystal layer sandwiched between the first substrate and the second substrate, containing P-type liquid crystal molecules, and configured to be perpendicularly aligned when no electric field is applied; a pixel including a reflecting region and a transmitting region, cell gaps of the reflecting region and the transmitting region being the same; one pixel electrode formed into a line on the first electrode; a first common electrode provided on the first substrate to sandwich the pixel electrode; a second common electrode provided on the second substrate; and a reflecting film provided in the reflecting region to overlap a portion of the pixel electrode, and comprising a conductive material.

Claims

1. A liquid crystal display device comprising:

a first substrate and a second substrate opposing each other;

a liquid crystal layer sandwiched between the first substrate and the second substrate, containing P-type liquid crystal molecules, and configured to be perpendicularly aligned when no electric field is applied;

a pixel including a reflecting region and a transmitting region, cell gaps of the reflecting region and the transmitting region being the same;

one pixel electrode formed into a line on the first electrode;

a first common electrode provided on the first substrate to sandwich the pixel electrode;

a second common electrode provided on the second substrate; and

a reflecting film provided in the reflecting region to overlap a portion of the pixel electrode, and comprising a conductive material.

2. The liquid crystal display device of claim 1, wherein the same voltage as that of the first common electrode is applied to the reflecting film.

3. The liquid crystal display device of claim 1, wherein

in a first display mode, a common voltage is applied to the pixel electrode, the first common electrode, the second common electrode, and the reflecting film, and

in a second display mode, a voltage higher than the common voltage is applied to the pixel electrode, and the common voltage is applied to the first common electrode, the second common electrode, and the reflecting film.

4. The liquid crystal display device of claim 1, further comprising a dielectric film provided between the second common electrode and the liquid crystal layer.

5. The liquid crystal display device of claim 1, wherein the first common electrode surrounds the pixel electrode.

6. The liquid crystal display device of claim 1, further comprising an interconnection configured to supply a voltage to the pixel electrode,

wherein the first common electrode is arranged to overlap the interconnection.

7. The liquid crystal display device of claim 1, further comprising:

a first retardation plate provided on the first substrate; and

a second retardation plate provided on the second substrate,

wherein a phase difference of the first retardation plate and the second retardation plate is λ

/4.