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Polarizing elements and polarizers

A polarizing element and light source technology, applied in optical elements, polarizing elements, optics, etc., can solve the problems of narrow viewing angle, insufficient brightness, light leakage, etc., and achieve the effect of high polarizing performance

Active Publication Date: 2017-07-21
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the subject of research, there is a problem that light leakage occurs depending on the angle at which the image is viewed due to the alignment direction of the liquid crystal, making it difficult to see the image, that is, the viewing angle is narrow
[0023] Commonly known neutral gray iodine polarizers have high contrast in a wide wavelength region, but in the blue light source region where the maximum luminous output is 440nm to 470nm, which is used for fluorescent excitation color conversion displays, there is more light leakage and Can't get enough contrast, and the brightness is not enough
When used as a polarizer in a fluorescent excitation color conversion display, in order to obtain a maximum brightness of 240cd / m 2 And require Ep ≥ 30%, and in order to get 240cd / m 2 The maximum brightness and the screen contrast in the dark room above 200 require a polarizer contrast (Ep / Ec) of 6,000. So far, there is no polarizer that can meet the above requirements

Method used

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  • Polarizing elements and polarizers
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] A polyvinyl alcohol-based resin film (VF series manufactured by Kuraray Co., Ltd.) having a saponification degree of 99% or more with a film thickness of 75 μm was immersed in warm water at 40° C. for 3 minutes to perform swelling treatment. The film that has been swelled is immersed in a 45°C aqueous solution containing 0.04% by weight of C.I. Direct Orange 39, 0.1% by weight of sodium tripolyphosphate, and 0.1% by weight of Glauber's salt as a pigment of the dichroic dye (A) group. The dyeing treatment of the pigment allows the pigment to be adsorbed on the polyvinyl alcohol-based film. The dye-adsorbed membrane was washed with water, and after washing, boric acid treatment was performed for 1 minute with a 40° C. aqueous solution containing 2% by weight of boric acid. The film obtained after the boric acid treatment was stretched 5.0 times, and treated in a 55° C. aqueous solution containing 3% by weight of boric acid for 5 minutes. The film obtained after the boric...

Embodiment 2

[0131] As the pigment to be adsorbed, use 0.02% by weight of the dichroic dye (B), namely the pigment shown in formula (1), in formula (1), R 1 , R 2 It is a hydrogen atom, and the ratio of n measured by HPLC is: n=1 is 33%, n=2 is 65%, and n=3 is 2%. In addition, a polarizing plate is produced in the same manner as in Example 1, and as a measurement sample.

Embodiment 3

[0133] As the dye to be adsorbed, 0.018% by weight of C.I. Direct Orange 39 as a dye of the dichroic dye (A) group, and 0.015% by weight of the dye represented by the formula (1) as the dichroic dye (B) were used , in formula (1), R 1 , R 2 It is a hydrogen atom, and the ratio of n measured by HPLC is: n=1 is 33%, n=2 is 65%, and n=3 is 2%. In addition, a polarizing plate is produced in the same manner as in Example 1, and as a measurement sample.

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Abstract

The present invention relates to a polarizer, which is suitable for a fluorescence excitation color conversion display using a blue LED or a blue fluorescent tube with a maximum luminous output of 440nm to 470nm as a light source. The polarizer is characterized by high contrast and light leakage Less, high transmittance when light passes through. The polarizing elements and polarizers involved in the present invention are characterized in that Tp≥30% in the wavelength region of 440nm≤λ≤470nm, and CR≥8,000 in any continuous wavelength region between 20nm, and in the remaining wavelength regions CR≥5,000 and contain at least dichroic pigments.

Description

technical field [0001] The present invention relates to a polarizing element and a polarizing plate using the same. Background technique [0002] A polarizing element is generally manufactured by adsorbing an iodine complex as a dichroic dye or a dichroic dye on a polyvinyl alcohol-based resin film and aligning it. A protective film made of triacetyl cellulose or the like is bonded to at least one surface of the polarizing element through an adhesive layer to form a polarizing plate. Polarizing plates have light transmission / shielding functions, so they become the basic components of liquid crystals with optical switching functions and display devices such as liquid crystal displays (LCDs). The applicable field of LCD has also expanded from small machines such as calculators and clocks in the early days to a wide range of notebook computers, word processors, LCD projectors, LCD TVs, car navigation, mobile phones, and indoor and outdoor measuring equipment. Can be used unde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/305G02B2207/113G02B5/30G02F1/1335
Inventor 矢作悦幸田中兴一樱井弘
Owner NIPPON KAYAKU CO LTD
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