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Liquid crystal display device

一种液晶显示装置、液晶层的技术，应用在非线性光学、仪器、光学等方向，能够解决没有改善正向对比度等问题，达到防止正面对比度的降低的效果

Inactive Publication Date: 2014-06-18
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the optical compensation method of Patent Document 2, compared with the optical compensation method of Patent Document 1, the oblique contrast is improved, but the front contrast is not improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] Although the present invention is described based on examples, the present invention is not limited to the following examples. In addition, each measured value of the examples was measured by the following method.

[0083] [Measurement methods]

[0084] (Delay of Optical Compensation Element)

[0085] Measurement was performed with light having a wavelength of 590 nm at 23°C using a phase difference meter based on the parallel Nicol rotation method (product name 'KOBRA-WPR' manufactured by Oji Scientific Instruments). Measure the retardation when the film is tilted 40° in the front (normal) direction and the slow axis direction as the rotation axis, and calculate the direction of the maximum in-plane refractive index, the direction perpendicular to it, and the Respective refractive indices nx, ny, nz in the thickness direction. From these values ​​and the thickness of the film measured using a direct-reading thickness gauge, in-plane retardation Re=(nx-ny)×d and thic...

manufacture example 1

[0093] (Production of backlight A)

[0094] Such as Figure 8 As shown schematically, a projection lens 2 and a dotted slit 3 (10mmφ) are set in front of a 100W metal halide lamp light source 1, and a mirror aluminum reflector 3 is set at the position where the light projected from there is reflected. An acrylic Fresnel lens 5 (diagonal 20 inches, focal length 40 cm) was arranged at the position where light was transmitted. In addition, a diffusion sheet 6 (haze 20%, half-diffusion angle 5°) was laminated on the front of the Fresnel lens 5 in order to hide the edge pattern of the above-mentioned Fresnel lens and eliminate uneven brightness in the plane. The backlight thus obtained is referred to as "backlight A". The half brightness angle of the backlight source A is 5°.

manufacture example 2

[0096] (Production of backlight B)

[0097] In Production Example 1 above, except that a sheet having a haze of 40% and a half-diffusion angle of 10° was used as the diffusion sheet 6 , a concentrating backlight was produced in the same manner as in Production Example 1. Let this backlight be "backlight B". The half brightness angle of the backlight B is 9°.

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Abstract

An object of the invention is to provide a liquid crystal display having good contrast not only in oblique directions but also in the normal direction. The liquid crystal display of the invention includes at least a first polarizer 21, a liquid crystal cell 10 having a liquid crystal layer 13 between a first substrate 11 and a second substrate 12, a compensation element 30, a second polarizer 22, and a light-condensing backlight 80, which are arranged in this order from a viewer side. The liquid crystal display preferably includes a diffusion element on the viewer side of the first polarizer. The light-condensing backlight 80 preferably has a half-brightness angle of 3 DEG to 30 DEG .

Description

[0001] This application is an international application with the filing date of July 1, 2009 and the application number PCT / JP2009 / 062030 entering the national phase of the State Intellectual Property Office of China (the national application number is 2009801006695), and the invention name is "liquid crystal display device" Divisional application of the application. technical field [0002] The invention relates to a liquid crystal display device. More specifically, it relates to a liquid crystal display device excellent in both frontal contrast ratio and oblique contrast ratio. Background technique [0003] A liquid crystal display device generally includes a light source such as a backlight on a liquid crystal panel formed by sandwiching a liquid crystal cell between two polarizing plates, and the liquid crystal cell has a structure in which a liquid crystal layer is sandwiched between a pair of substrates including electrodes. The alignment state of the liquid crystal l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363G02F1/1335G02F1/13357
CPCG02F1/133606G02F1/13363G02F2001/133562G02F1/133504G02F1/133562
Inventor 武本博之渊田岳仁
Owner NITTO DENKO CORP