Optical member and liquid crystal display device

A technology of optical components and protective covers, applied in optical elements, optics, nonlinear optics, etc., can solve problems such as uneven rainbow and reduced brightness, and achieve low cost and suppress the reduction of visibility

Pending Publication Date: 2019-03-01
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the polymer film used in the visibility improvement method of Patent Document 1 is applied to a liquid crystal display device for a car navigation system, the luminance may decrease due to the influence of the optical characteristics of the protective cover, or rainbow unevenness may occur. etc.

Method used

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  • Optical member and liquid crystal display device
  • Optical member and liquid crystal display device
  • Optical member and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1. Fabrication of polarizers

[0060] A polyvinyl alcohol film with a thickness of 80 μm was stretched 3 times while being dyed in a 0.3% iodine solution at 30° C. for 1 minute between rolls having different speed ratios. Thereafter, it was stretched to a total draw ratio of 6 times while being immersed in an aqueous solution containing 4% boric acid and 10% potassium iodide at 60° C. for 0.5 minutes. Next, after washing|cleaning by immersing in the aqueous solution containing the potassium iodide of 1.5% density|concentration at 30 degreeC for 10 second, it dried at 50 degreeC for 4 minutes, and obtained the polarizer. A saponified triacetyl cellulose film having a thickness of 80 μm was bonded to both surfaces of the polarizer with a polyvinyl alcohol-based adhesive to prepare a polarizing plate (polarizing film).

[0061] 2. Fabrication of optical components

[0062] As the protective cover, a plastic cover (manufactured by Mitsubishi Gas Chemical Co., Ltd., produc...

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Abstract

Provided is an optical member which makes it possible, at low cost, to prevent reductions to visibility that occur when a liquid crystal display device having a protective cover is viewed through polarized sunglasses. The optical member is provided with a polarizing film and a protective cover. The in-plane retardation of the protective cover is at least 1000 nm, and the angle formed by the slow axis of the protective cover and the absorption axis of the polarizing film is 40 degrees to 50 degrees.

Description

technical field [0001] The invention relates to an optical component and a liquid crystal display device with the optical component. Background technique [0002] To reduce glare in sunny environments, use sunglasses with polarizing properties (polarized sunglasses). However, when viewing a liquid crystal display device while wearing polarized sunglasses, the display light of the liquid crystal display device may be absorbed by the polarized sunglasses depending on the observer's posture, and visibility may be reduced. [0003] Patent Document 1 describes a method for improving visibility, which uses a white light-emitting diode as a backlight for a liquid crystal display device, and the angle formed by the absorption axis of the polarizer and the slow axis of the polymer film is approximately 45°. In the embodiment, a polymer film having a retardation of 3000 to 30000 nm is disposed on the observer side of the polarizer and used. According to the visibility improvement me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335G02F1/13363
CPCG02F1/1335G02F1/13363G02B5/3083G02B1/14G02B5/30G02B5/3025G02F1/133528C09K2323/035
Inventor 渊田岳仁麓弘明高田胜则北村吉绍
Owner NITTO DENKO CORP
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