Liquid crystal display panel, and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9372371-B2
Application number	US-201214126455-A
Country	US
Kind code	B2
Filing date	May 31, 2012
Priority date	Jun 27, 2011
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

The present invention provides a liquid crystal display panel which is capable of providing a sufficiently high response speed and an excellent transmittance, and a liquid crystal display device. The liquid crystal display panel of the present invention includes a first substrate, a second substrate, and a liquid crystal layer disposed between the substrates. The first substrate and the second substrate have electrodes. The electrodes of the second substrate include a pair of comb-shaped electrodes and a slit-formed electrode.

First claim

The invention claimed is:

1. A liquid crystal display panel, comprising
a first substrate, a second substrate, and a liquid crystal layer disposed between the substrates,
the first substrate and the second substrate comprising electrodes,
the electrodes of the second substrate including a pair of comb-shaped electrodes and a slit-formed electrode, and
the slit-formed electrode of the second substrate being disposed below the pair of comb-shaped electrodes with an insulating layer interposed therebetween and being driven independently of the pair of comb-shaped electrodes,
wherein the slit-formed electrode does not overlap the pair of comb-shaped electrodes in a plan view of the main surfaces of the substrates,
wherein portions of the slit-formed electrode of the second substrate are electrically connected in a pixel line, and
wherein the slit-formed electrode of the second substrate includes commonly connected portions corresponding to even-numbered lines and commonly connected portions corresponding to odd-numbered lines, and is driven to invert electric potential changes of the portions corresponding to even-numbered lines and the portions corresponding to odd-numbered lines in response to application of a voltage.

2. The liquid crystal display panel according to claim 1 ,
wherein at least part of an edge of the slit-formed electrode does not overlap the pair of comb-shaped electrodes in a plan view of the main surfaces of the substrates.

3. The liquid crystal display panel according to claim 2 ,
wherein the at least part of an edge of the slit-formed electrode is apart from the pair of comb-shaped electrodes by 0.5 μm or greater but 0.7S μm or smaller in a plan view of the main surfaces of the substrates, where S (μm) is a width of a gap between tooth portions of the pair of comb-shaped electrodes.

4. The liquid crystal display panel according to claim 1 ,
wherein the slit-formed electrode exists on a layer different from the layer on which the pair of comb-shaped electrodes exists.

5. The liquid crystal display panel according to claim 1 ,
wherein the liquid crystal layer includes liquid crystal molecules which are aligned in the orthogonal direction to main surfaces of the substrates with a voltage lower than a threshold voltage.

6. The liquid crystal display panel according to claim 1 ,
wherein the electrode of the first substrate is a planar electrode.

7. The liquid crystal display panel according to claim 1 ,
wherein the liquid crystal layer includes liquid crystal molecules with positive anisotropy of dielectric constant.

8. The liquid crystal display panel according to claim 1 ,
wherein at least one of the first substrate and the second substrate comprises a thin film transistor element, and
the thin film transistor element comprises an oxide semiconductor.

9. A liquid crystal display device, comprising
the liquid crystal display panel according to claim 1 .

10. The liquid crystal display panel according to claim 1 ,
wherein the second substrate is provided with thin-film transistors, and gate bus lines and source bus lines which are separately connected to respective ones of the thin-film transistors, and
pixels defined by the gate bus lines and the source bus lines are driven independently.

Assignees

• Yoshioka Takatomo
• Aoyama Iori
• Imaoku Takao
• Iyama Yuichi
• Tsuda Kazuhiko
• Sharp Kk

Inventors

• Yoshioka Takatomo
• Aoyama Iori
• Imaoku Takao
• Iyama Yuichi
• Tsuda Kazuhiko

Classifications

• G02F1/133707

  Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes · CPC title

• G02F2001/134372

  Physics · mapped topic

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F2001/134381

  Physics · mapped topic

• G02F1/134372

  for fringe field switching [FFS] where the common electrode is not patterned · CPC title