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Liquid crystal display

一种液晶显示装置、液晶层的技术，应用在光学、仪器、非线性光学等方向，能够解决灰度反转、显示对比度降低、显示颜色改变等问题

Inactive Publication Date: 2009-02-11
NIPPON OIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the aforementioned methods cannot solve the above-mentioned problems with respect to the viewing angle, such as a decrease in display contrast, a change in display color, and inversion of gray scales, which occur when a liquid crystal display device is viewed obliquely.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0132] (Preparation of third optically anisotropic layer 13)

[0133] With 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2'-bis(trifluoromethyl)-4,4'-diphenyldiamine ( TFMB) synthesized a polyimide having a weight average molecular weight (Mw) of 70000 and Δn of about 0.04. A twenty-five percent (by mass) solution of polyimide prepared with cyclohexanone as a solvent was coated on an 80 μm thick triacetate fiber. The coated triacetate was heated at a temperature of 150° C. for 5 minutes to produce a completely transparent smooth film 13 . The film has in-plane retardation Re=1nm, thickness direction retardation Rth=-100nm, and .

Embodiment 1

[0135] will refer to Figure 4 with 5 The structure and axis arrangement of the liquid crystal display device of Example 1 are described.

[0136] A transparent electrode 3 formed of a highly transmissive material such as ITO is arranged on the substrate 1 , and a counter electrode 4 formed of a highly transmissive material such as ITO is arranged on the substrate 2 . A liquid crystal layer 5 formed of a liquid crystal material exhibiting positive dielectric constant anisotropy is sandwiched between the transparent electrode 3 and the counter electrode 4 . The fourth optically anisotropic layer 9, the first optically anisotropic layer 10, and the polarizer 7 are arranged on the substrate 2 side (opposite to the side where the counter electrode 4 is formed), while the third optically anisotropic layer 13, the first optically anisotropic layer The second optically anisotropic layer 11, the first optically anisotropic layer 12, and the polarizer 8 are arranged on one side of th...

Embodiment 2

[0145] will refer to Figure 7 with 8 The structure and axis arrangement of the liquid crystal display device of Example 2 are described.

[0146] The liquid crystal cell 6 of Example 1 was used. On the side of the substrate 2 opposite to the side where the counter electrode 4 is formed, the third optically anisotropic layer 13 , the fourth optically anisotropic layer 15 , the first optically anisotropic layer 16 and the polarizer 7 are arranged. On the side of the substrate 1 opposite to the side where the transparent electrode 3 is formed, the second optically anisotropic layer 11 , the first optically anisotropic layer 17 and the polarizer 8 are arranged. A backlight 14 is arranged behind the polarizer 8 .

[0147] Polarizers 7 , 8 , second optically anisotropic layer 11 , and third optically anisotropic layer 13 are the same as those used in Embodiment 1.

[0148] A polarizer 7 is provided on the viewer's side of the liquid crystal cell 6 ( Figure 7 the upper part of...

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Abstract

The present invention provides a liquid crystal display device comprising at least: a backlight; a polarizer; a first optically anisotropic layer with a retardation of 210 to 300 nm at a wavelength of 550 nm; a second optically anisotropic layer with a retardation of 50 to 140 nm at a wavelength of 550 nm; a third optically anisotropic layer with negative optical anisotropy; a liquid crystal cell comprising upper and lower substrates facing each other and a liquid crystal layer sandwiched between the upper and lower substrates; a fourth optically anisotropic layer with a retardation of 50 to 140 nm at a wavelength of 550 nm; a first optically anisotropic layer with a retardation of 210 to 300 nm at a wavelength of 550 nm; ; and a polarizer, arranged in piles in this order from the backlight, the second optically anisotropic layer comprising at least a liquid crystal film with a fixed nematic hybrid liquid crystal orientation structure. The liquid crystal display device provides bright images and is high in contrast and less in viewing angle dependency.

Description

【Technical field】 [0001] The present invention relates to liquid crystal display devices for office automation (OA) equipment such as word processors and personal computers, mobile information terminals such as personal digital assistants and mobile phones, or camcorders equipped with liquid crystal monitors or having reflective A transflective liquid crystal display device of both mode and transmissive mode. 【Background technique】 [0002] Liquid crystal display devices are broadly classified into liquid crystal display devices capable of displaying images in a reflective mode, liquid crystal display devices capable of displaying images in a transmissive mode, liquid crystal display devices capable of displaying images in both reflective and transmissive modes, and have been It is widely used as a display device for laptop computers and televisions because of its light weight. In particular, a transflective liquid crystal display device uses a display mode capable of displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363G02B5/30G02F1/1335
CPCG02F1/133528G02F1/133634G02F1/133632G02F2413/105G02F1/13363G02F1/1335
Inventor 上坂哲也池田哲
Owner NIPPON OIL CO LTD
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