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Liquid crystal display device

A technology of liquid crystal display device and liquid crystal layer, which is applied in the directions of instruments, nonlinear optics, optics, etc., can solve problems such as insufficient viewing angle compensation

Active Publication Date: 2020-01-03
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when a self-organized photo-alignment film with a larger optical path difference than the rubbing alignment film is used, in the above design, the viewing angle compensation may not be sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0165] The liquid crystal display device of the present embodiment is a liquid crystal display device of a transverse electric field system, and has a display area for displaying an image (screen), and the display area is composed of a plurality of pixels arranged in a matrix.

[0166] figure 1 It is a schematic perspective view of the liquid crystal display device of the first embodiment. figure 2 (a) and (b) are schematic diagrams showing the arrangement (axial direction) of the optical axis of each layer in plan view in the liquid crystal display device of Embodiment 1, showing the case where the dielectric constant anisotropy of the liquid crystal layer is positive . image 3 (a) and (b) are schematic diagrams showing the arrangement (axial direction) of the optical axis of each layer in planar view in the liquid crystal display device of Embodiment 1, showing the case where the dielectric constant anisotropy of the liquid crystal layer is negative .

[0167] Such as ...

Embodiment approach 2

[0232] Embodiment 2 is substantially the same as Embodiment 1 except that the optical properties of the second protective layer and the design conditions of the optical axis are different. In this embodiment, the second protective layer is optically isotropic. The description of the contents overlapping with the present embodiment and the first embodiment will be omitted.

[0233] Figure 8 It is a schematic perspective view of a liquid crystal display device according to Embodiment 2. FIG. Figure 9 (a) and (b) are schematic diagrams showing the arrangement (axial direction) of the optical axis of each layer in plan view in the liquid crystal display device of Embodiment 2, showing the case where the dielectric constant anisotropy of the liquid crystal layer is positive . Figure 10 (a) and (b) are schematic diagrams showing the arrangement (axial direction) of the optical axes of each layer in plan view in the liquid crystal display device of Embodiment 2, showing the cas...

Embodiment approach 3

[0247] Embodiment 3 is substantially the same as Embodiment 1 except that the optical properties of the first protective layer and the design conditions of the optical axis are different. In this embodiment, the first protective layer is optically isotropic. The description of the contents overlapping with the present embodiment and the first embodiment will be omitted.

[0248] Figure 11 It is a schematic perspective view of a liquid crystal display device according to Embodiment 3. FIG. Figure 12 It is a schematic diagram showing the arrangement (axial direction) of the optical axes of each layer in plan view in the liquid crystal display device of Embodiment 3, and shows a case where the dielectric constant anisotropy of the liquid crystal layer is positive. Figure 13 It is a schematic diagram showing the arrangement (axial direction) of the optical axes of each layer in plan view in the liquid crystal display device of Embodiment 3, and shows a case where the dielectr...

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Abstract

The present invention is a liquid crystal display device of FFS mode, which sequentially has a first polarizer (2), a second protective layer (3a), a first substrate (10), a first photo-alignment film (11), a liquid crystal molecule-containing The liquid crystal layer (12) of the horizontal alignment type, the second photo-alignment film (13), the second substrate (14) comprising the signal electrode and the opposite electrode opposite to the signal electrode, the second protective layer (5a), the second polarization sheet (6) and backlight source (7), the first and second protective layers satisfy the relationship of nx=ny≥nz, the optical path difference in the plane of the first and the second photo-alignment film is more than 1nm, when the second The optical path difference in the thickness direction of the first and second protective layers is set as R 1 , the in-plane retardation of the first and second photo-alignment films is set as R 2 When, R 1 and R 2 Meet R 1 ≤0.047R 2 2 -2.1R 2 +44.3, the liquid crystal layer has a positive dielectric constant anisotropy, and the transmission axis of the second polarizer is perpendicular to the initial alignment direction of the liquid crystal molecules.

Description

technical field [0001] The present invention relates to a liquid crystal display device. Specifically, the present invention relates to a lateral electric field type liquid crystal display device excellent in viewing angle characteristics. Background technique [0002] Since liquid crystal display devices have advantages such as light weight, thin profile, and low power consumption, they are actively being developed. In recent years, liquid crystal display devices widely used in portable electronic devices such as smartphones and tablet PCs have been known to adopt horizontal display devices such as the IPS (InPlane Switching; in-plane switching) method and the FFS (Fringe Field Switching; fringe field switching) method. An electric field type liquid crystal display device. [0003] An IPS type liquid crystal display device discloses, for example, a liquid crystal display device in which a first polarizing film, a first retardation region and a second retardation region, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13363G02F1/1337
CPCG02F1/133634G02F1/133784G02F1/133788G02F1/134363G02F2201/50G02F2202/40G02F2413/02G02F2413/05G02F2413/13G02F1/133635G02F1/133749G02F1/134372G02F1/1337G02F1/133345G02F1/133528G02F1/133602G02F1/1343
Inventor 川平雄一三宅敢
Owner SHARP KK