Liquid crystal display device

A liquid crystal display and device technology, applied in the field of liquid crystal display devices, can solve problems such as the difficulty of biaxial anisotropic optical sheets

Inactive Publication Date: 2004-04-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to manufacture biaxially anisotropic optical sheets with NZ less than 1.0 (i.e., nx > nz > ny) industrially

Method used

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  • Liquid crystal display device
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Embodiment Construction

[0031] Preferred embodiments of the present invention are described below with reference to the associated drawings.

[0032] refer to Figure 1A with 1B , to describe the configuration and function of the liquid crystal display devices 100A and 100B of the embodiment of the present invention.

[0033] The liquid crystal display devices 100A and 100B respectively include a liquid crystal layer 10 which exhibits a roughly vertically aligned state in a black display state. Figure 1A with 1B The liquid crystal layer 10 is shown in a black display state, in which the liquid crystal molecules 10a of the liquid crystal layer 10 are substantially vertically aligned with respect to the display plane (parallel to the surface of the liquid crystal layer).

[0034] The alignment state of the liquid crystal layer is controlled by applying a voltage between the electrodes 11a and 11b facing each other with the liquid crystal layer 10 in between. The liquid crystal layer 10 and the ele...

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Abstract

The liquid crystal display device of the invention includes: a liquid crystal layer taking on a roughly vertically aligned state in the black display state; first and second polarizing plates placed to face each other so that the transmission axes are orthogonal to each other; at least one first phase plate placed between the liquid crystal layer and the first polarizing plate and / or the second polarizing plate; at least one second phase plate placed between the first phase plate and the first or second polarizing plate whichever is farther from the first phase plate; and an illuminator for illuminating the liquid crystal layer with light via the first or second polarizing plate. The first phase plate has biaxial optical anisotropy and has functions of compensating part of thickness-direction retardation of the liquid crystal layer in the black display state and suppressing light leakage caused by deviation of the transmission axes of the first and second polarizing plates from the mutual orthogonal relationship in a tilted viewing angle direction. The second phase plate has negative uniaxial optical anisotropy and has a function of compensating the thickness-direction retardation of the liquid crystal layer in the black display state in cooperation with the first phase plate.

Description

field of invention [0001] The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device which exhibits a black display when its liquid crystal layer is in a roughly vertically aligned state. Background technique [0002] In recent years, thanks to the improvement of its display quality, liquid crystal display devices have been widely used. However, there are still strong expectations for further improvements in display quality. [0003] One display property of liquid crystal displays that requires further improvement is the reduction of the dependence of display quality on viewing angle. That is, it is desired to develop a liquid crystal display device that exhibits a display with a sufficiently high contrast ratio even when viewed in a direction oblique to the normal of the display plane (the direction is defined by the viewing angle). In other words, LCD displays are expected to have a wider viewing angle. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335G02F1/13363G02F1/139
CPCG02F1/133634G02F1/1393A63H1/20A63H1/02A63H29/24A63H31/00
Inventor 内田岁久宫地弘一久保真澄中井信彦大蔵英彦
Owner SHARP KK
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