Liquid crystal display device

US20130016314A1Inactive Publication Date: 2013-01-17JAPAN DISPLAY INC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2013-01-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A liquid crystal display device having a second substrate and a first substrate that is placed so as to face the above-described second substrate with pixel regions aligned in a matrix is provided with: protrusions that are formed on pixel boarders and protrude from the second substrate on the liquid crystal side; first electrodes made of sidewall electrodes formed on sidewalls of protrusions and a lower end side electrode extending from the sidewall electrodes on the bottom side; and second electrodes made of a first linear electrode formed within a pixel region and a second linear electrode that is formed on the second substrate and faces the first linear electrode.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] The present application claims priority over Japanese Patent Application JP2011-154440 filed on Jul. 13, 2011, the contents of which are hereby incorporated into this application by reference.BACKGROUND OF THE INVENTION

[0002] (1) Field of the Invention

[0003] The present invention relates to a liquid crystal display device, and in particular, to an in-plane switching mode liquid crystal display device where an electrical field is applied parallel to the surface of the substrates.

[0004] (2) Description of the Related Art

[0005] In in-plane switching (IPS) mode liquid crystal display devices, liquid crystal molecules are aligned parallel to the surface of the panel and an electrical field (lateral electrical field) is applied parallel to the surface of the panel so that the liquid crystal molecules rotate by 90° in the plane. In such IPS mode liquid crystal display devices, a common electrode is formed on the first substrate where video signal lin...

Examples

first embodiment

Entire Structure

[0068]FIG. 1 is a diagram for illustrating the entire structure of the liquid crystal display device according to the first embodiment of the present invention. In the following, the entire structure of the liquid crystal display device according to the first embodiment is described in reference to FIG. 1. In the present specification, the transmittance, excluding the effects of absorption by color filters CF, polarizing plates POL1, POL2 and the like and the effects of the aperture ratio, is regarded as the efficiency in the display mode. Accordingly, the efficiency in the display mode is 100% in the case where the direction of the oscillation of linearly polarized light emitted from the polarizing plate POL1 on the backlight unit side is rotated by 90° when it enters into the polarizing plate POL2 on the display side.

[0069]As shown in FIG. 1, the liquid crystal display device according to the first embodiment has a liquid crystal display panel PNL that is formed of...

second embodiment

[0111]FIG. 11 is a cross-sectional diagram for schematically illustrating the structure of the liquid crystal display panel in the liquid crystal display device according to the second embodiment of the present invention. In the following, the liquid crystal display device according to the second embodiment is described in reference to FIG. 11. Here, the liquid crystal display panel according to the second embodiment has the same structure as in the first embodiment, except the structure of the regions between a pair of wall pixel electrodes SE, that is to say, the portions of the liquid crystal layer LC to which an electrical field is applied. Accordingly, in the following, the structure of the regions between the wall pixel electrodes SE is described in detail. Though the description of the structure of the pixels according to the second embodiment refers to a case of a so-called multi-domain structure where the angles at which the wall pixel electrodes SE are inclined are differe...

third embodiment

[0132]FIG. 18 is a cross-sectional diagram for illustrating the structure of a pixel in the liquid crystal display device according to the third embodiment of the present invention. The liquid crystal display device according to the third embodiment has the same structure as the liquid crystal display device according to the second embodiment, except the structure of the fifth insulating film IL5 formed between wall pixel electrodes SE that are placed in periphery portions of the pixel so as to face each other. Accordingly, in the following, the fifth insulating film IL5 is described in detail.

[0133]As shown in FIG. 18, in the liquid crystal display device according to the third embodiment, the first substrate SU1 has the same structure as that in the first embodiment. The second substrate SU2 has a first insulating film ILL drain lines DL, a second insulating film IL2, wall bases WL and wall pixel electrodes SE formed in this order on the surface on the liquid crystal side. Here, i...