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Liquid crystal display apparatus

A technology of liquid crystal display device and liquid crystal layer, which is applied in the direction of instruments, polarizing elements, optics, etc., to achieve the effect of improving the viewing angle characteristics

Active Publication Date: 2019-05-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in conventional liquid crystal display devices, control of viewing angle characteristics is substantially only performed symmetrically with respect to the front direction ((φ, θ)=(0°, 0°)).

Method used

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  • Liquid crystal display apparatus

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Embodiment Construction

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

[0020] (Definition of terms and symbols)

[0021] Definitions of terms and symbols used in this specification are as follows.

[0022] (1) Refractive index (nx, ny, nz)

[0023] "nx" is the refractive index in the direction in which the in-plane refractive index becomes the largest (that is, the slow axis direction), "ny" is the refractive index in the in-plane direction perpendicular to the slow axis (that is, the fast axis direction), and "nz" is the refractive index in the thickness direction.

[0024] (2) In-plane retardation (Re)

[0025] "Re(λ)" is an in-plane retardation measured by light having a wavelength of λnm at 23°C. When the thickness of the layer (thin film) is set to d (nm), Re(λ) is obtained by the formula Re=(nx-ny)×d. For example, "Re(550)" is an in-plane retardation measured by ligh...

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Abstract

Provided is a liquid crystal display apparatus having improved viewing-angle characteristics in a region which is vertically asymmetrical with respect to the front horizontal direction. This liquid crystal display apparatus is provided with: a liquid crystal cell that is provided with a liquid crystal layer including liquid crystal molecules oriented in a homogeneous arrangement in a state where no electric field exists; a first polarizer that is disposed on the viewing side of the liquid crystal cell; a second polarizer that is disposed on the backside of the liquid crystal cell; a first optical compensation layer that is disposed between the liquid crystal cell and the first polarizer; and a second optical compensation layer that is disposed between the liquid crystal cell and the firstoptical compensation layer. The refractive index nz1 in the thickness direction of the first optical compensation layer is less than 1.5187, and the refractive index nz2 in the thickness direction ofthe second optical compensation layer is less than 1.5340.

Description

technical field [0001] The present invention relates to a liquid crystal display device. Background technique [0002] Liquid crystal display devices are used as display units for various instruments, navigation systems, and the like that are arranged on the sub-dashboard of automobiles. Such a vehicle-mounted liquid crystal display device is mainly visually recognized by the driver, so it is displaced to the four corners of a predetermined area on the upper side compared with the front direction (for example, (angle of view φ in the vertical direction, angle of view θ in the horizontal direction) = (+20°, +50°), (+20°, -50°), (-20°, +50°) and (-20°, -50°)) display characteristics (such as contrast and color tone) change important. However, in the conventional liquid crystal display device, substantially only the control of the viewing angle characteristic is performed symmetrically with respect to the front direction ((φ, θ)=(0°, 0°)). Therefore, a liquid crystal display...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363G02B5/30
CPCG02B5/30G02F1/13363G02F1/133634G02F2413/02G02F2413/06G02F2413/12G02F1/133528G02F2413/08G02F1/133538G02F1/133562G02F1/133567
Inventor 河村亮渊田岳仁高田胜则北村吉绍
Owner NITTO DENKO CORP
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