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Light diffusion plate, optical unit and liquid crystal display

A light-diffusing, liquid crystal polymer technology, applied in the field of light-diffusing plates, can solve problems such as difficult operation, difficult production, and lack of collimation, so as to reduce absorption loss, improve brightness, and highlight brightness and clarity Effect

Inactive Publication Date: 2002-08-28
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is hoped that using this method can solve the following conventional problems due to the large wavelength dependence of cholesteric liquid crystals in conventional type absorption loss reduction systems in which a cholesteric liquid crystal layer and a 1 / 4 wavelength plate are used , especially, the light transmitted from oblique directions is colored and these light diffusers cannot be applied to reflective liquid crystal displays etc.
However, in the above-mentioned conventional light-diffusing plate, there are problems such as difficulty in production, and difficulty in handling in actual use due to poor functional stability when applied to a liquid crystal display, etc.
However, in existing light-diffusing sheets, a birefringent film containing microdomains in a dispersed state is used, each of which is aligned in the stretching direction of the stretched film, and cannot be obtained in the same direction as the film. Aligned microdomains perpendicular to the direction of stretching

Method used

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  • Light diffusion plate, optical unit and liquid crystal display
  • Light diffusion plate, optical unit and liquid crystal display
  • Light diffusion plate, optical unit and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 100 parts of a 25% by weight toluene solution containing a norbornene series resin having hydrocarbons (trade name Zeonex, produced by Nihon Zeon Co., Ltd.) as a birefringent stretched film raw polymer and 6 parts by the following [molecular formula 5] (where n=35, which is the molecular weight % of the monomer unit, expressed as a block for convenience. Average molecular weight: 10000) The side chain type liquid crystal polymers represented were mixed together. By the casting method, the mixture was cast to form a thin film with a thickness of 100 μm. The formed film was stretched at 160° C. at a three-fold stretching ratio to obtain a light-diffusing plate comprising a birefringent stretched film comprising microparticles of the above-mentioned side chain type liquid crystal polymer in a dispersed state. Domain.

[0076] In the birefringent stretched film described above, the norbornene series resin forms a film in which the side chain type liquid crystal polymer i...

Embodiment 2

[0083] The light-diffusing plate obtained in Example 1, and a commercially available polarizing plate having a total light transmittance of 41% and a degree of polarization of transmitted light of 99% are adhered together by an acrylic resin series adhesive layer so that the The orientation of the extension axis and the transmission axis can be aligned and an optical element can be produced.

Embodiment 3

[0085] The polarizing plate, the TN liquid crystal cell, and the optical element obtained in Example 3 were bonded one by one on the diffuse reflection plate through an acrylic resin series adhesive layer, so that the polarizing plate can be formed on the side of the cell to obtain such Figure 4 The reflective LCD shown in. In addition, the polarizing plate is arranged so that the direction of the transmission axis can be consistent with each rubbing direction satisfying the requirements of the liquid crystal cell.

[0086] The luminance of the liquid crystal display obtained in Example 3 in the display state was measured with a luminance meter, and it was confirmed that the luminance was greatly improved compared with the case of using only the polarizing plate.

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Abstract

A light diffusing plate, which can anisotropically scatter linearly polarized light and has excellent diffusion properties in the scattering direction, and is suitable for improving the clarity and brightness of liquid crystal displays. The light diffusing plate includes a birefringent film and microdomains in a birefringent film having birefringence characteristics different from those of a birefringent film and existing in a dispersed state, the birefringent film comprising a birefringent stretched film, and the microdomains comprising a positive uniaxial liquid crystal polymer, wherein the microdomains are in The length in the direction of the stretching axis is longer than the length in the direction perpendicular to the stretching axis, and the liquid crystal polymer is aligned in the direction perpendicular to the stretching axis of the birefringent stretched film.

Description

field of invention [0001] The present invention relates to a light-diffusing plate, which can anisotropically scatter linearly polarized light and has excellent diffusion characteristics in the scattering direction, and is suitable for improving the clarity, brightness, etc. of liquid crystal displays, etc. . Furthermore, the present invention also relates to an optical element to which the light diffusing plate is applied. Background technique [0002] Conventionally, it is known to design a light-diffusing plate so as to anisotropically scatter linearly polarized light by forming domains in a dispersed state and having refractive index anisotropy in a raw material. Regarding the light-diffusing plate, there are already known (see USP No. 2123902 specification, WO87 / 01822 publication, JP-A 9-274108): a light-diffusing plate comprising a combination of a thermoplastic resin and a low-molecular-weight liquid crystal, a light-diffusing plate comprising a low-molecular-weight ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02B5/30G02F1/1335G02F1/13363
CPCG02B5/0236G02B5/0257G02B5/3016G02F1/133528G02B5/02
Inventor 中西贞裕宫武稔中野秀作望月周
Owner NITTO DENKO CORP
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