Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9612486-B2
Application number	US-201314409185-A
Country	US
Kind code	B2
Filing date	Jun 6, 2013
Priority date	Jun 21, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A liquid crystal display device is provided that has favorable display characteristics in a display mode using a vertical electric field and a horizontal electric field. This liquid crystal display device includes a first substrate and a second substrate arranged facing each other, and a liquid crystal layer sandwiched between the first substrate and the second substrate. The liquid crystal layer has liquid crystal molecules having a negative dielectric anisotropy, and the first substrate has a plate-shaped first common electrode and a pixel electrode formed in a separate layer from the first common electrode with an insulating film therebetween. The pixel electrode has a comb-shaped structure, and the second substrate has a second common electrode with a liquid crystal orientation structure that is linear in a plan view.

First claim

What is claimed is:

1. A liquid crystal display device, comprising:
a first substrate having a plate-shaped first common electrode, and a pixel electrode that is provided in a separate layer from the first common electrode with an insulating film therebetween;
a second substrate facing the first substrate; and
a liquid crystal layer sandwiched between the first substrate and the second substrate, said liquid crystal layer comprising liquid crystal molecules that have a negative dielectric anisotropy,
wherein the second substrate has a second common electrode having a comb-shaped structure as a liquid crystal orientation control structure that is linear in a plan view, the comb-shaped structure having comb fingers extending in a first direction and receiving a same electrical potential so as to restrict tilting directions of the liquid crystal molecules to the first direction,
wherein the pixel electrode has a comb-shaped structure having comb fingers extending at an angle relative to the first direction,
wherein the liquid crystal molecules are initially oriented vertically and are titled to said first direction that is parallel to the first and second substrates in response to a potential differential applied between the pixel electrode and the second common electrode, and
wherein the first substrate further includes a third common electrode having a comb-shaped structure, comb fingers of the third common electrode and the comb fingers of the pixel electrode being in parallel with each other and being interlocked with each other, and receiving mutually different electrical potentials so as to cause the liquid crystal molecules that have been tilted to said first direction to rotate horizontally.

2. The liquid crystal display device according to claim 1 , wherein said angle at which the comb fingers of the pixel electrode extend relative to the first direction is within 0±20° or within 90±20°.

3. The liquid crystal display device according to claim 1 , wherein spacing between the comb fingers of the second common electrode is 2 to 5 μm.

4. The liquid crystal display device according to claim 1 , wherein a width of the comb fingers of the second common electrode is 2 to 5 μm.

5. The liquid crystal display device according to claim 1 , wherein a lengthwise direction of slits defined by the comb fingers of the second common electrode is at a 90±20° angle to a lengthwise direction of slits defined by the comb fingers of the comb-shaped structure of the pixel electrode.

Assignees

• Sharp Kk

Inventors

• Yoshida Hidefumi
• Iwata Yosuke
• Murata Mitsuhiro
• Nasu Yasuhiro
• Miyachi Koichi
• Kamata Tsuyoshi

Classifications

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title

• G02F1/1336

  Illuminating devices · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02F2001/13712

  Physics · mapped topic