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Elliptic polarizing plate and image display device using the same

An elliptical polarizer and polarizer technology, applied in optics, optical components, polarizing components, etc., can solve problems such as difficulty in adjustment, and achieve the effect of reduced thickness and excellent heat resistance

Inactive Publication Date: 2007-02-28
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this approach is that it is difficult to adjust

Method used

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  • Elliptic polarizing plate and image display device using the same
  • Elliptic polarizing plate and image display device using the same
  • Elliptic polarizing plate and image display device using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0186] I. Alignment treatment of transparent protective film (preparation of alignment substrate)

[0187] The transparent protective film (T) is subjected to an alignment treatment to prepare an alignment substrate (finally the protective layer 12).

[0188] Substrates (1) to (8): A PVA film (0.1 μm in thickness) was formed on the surface of the TAC film (40 μm in thickness). Subsequently, the surface of the PVA film was rubbed with a rubbing cloth at the rubbing angles shown in the table below, thereby forming each alignment substrate.

[0189] Substrates (9) and (10): Each alignment substrate was formed by rubbing the TAC film (thickness: 40 μm) at the rubbing angle shown in the table below with a rubbing cloth.

[0190] serial number

Substrate

friction angle

(angle α)

Phase difference in thickness direction

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

TAC+PVA

TAC+PVA

TAC+PVA

TAC+PVA

TAC+PVA...

Embodiment 2

[0210] The ellipsoidal polarizer A09 was overlaid to measure the contrast. For this elliptical polarizer, when the contrast ratio is 10, the minimum angle is 40° in all directions, the maximum angle is 50°, and the difference between the maximum and minimum angles is 10°. In actual use, when the contrast ratio in all directions is 10, the minimum angle of 40° is the preferred level. Moreover, the difference between the maximum and minimum angles is only 10°, which is also a very preferable level in practical use, so the elliptical polarizer has balanced visual characteristics.

Embodiment 3

[0212] The elliptically polarizing plate A01 was overlaid to measure the contrast. For this elliptical polarizer, when the contrast ratio is 10, the minimum angle in all directions is 40°, the maximum angle is 60°, and the difference between the maximum and minimum angles is 20°. In actual use, when the contrast ratio in all directions is 10, the minimum angle of 40° is the preferred level.

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Abstract

An extremely thin wideband elliptic polarizing plate having a wide view angle and its convenient production method, and an image display employing the elliptic polarizing plate. The elliptic polarizing plate comprises a polarizer, a protective layer formed on one side of the polarizer, a first double refraction layer functioning as a ramda / 2 plate, and a second double refraction layer functioning as a ramda / 4 plate, all arranged in this order, wherein the angle a between the absorption axis of the polarizer and the phase lag axis of the first double refraction layer is 10 DEG to 20 DEG or -10 DEG to -20 DEG , and the angle ss between the absorption axis of the polarizer and the phase lag axis of the second double refraction layer is 65 DEG to 85 DEG or 5 DEG to 25 DEG .

Description

technical field [0001] The invention relates to an elliptically polarized plate and an image display device using the elliptically polarized plate. More specifically, the present invention relates to a very thin elliptically polarizing plate having a wide frequency band and a wide viewing angle, and an image display device using the elliptically polarizing plate. Background technique [0002] Various optical films, each having a combined polarizing film and retardation plate, are generally used in various image display devices, such as liquid crystal display devices and electroluminescent displays (EL), to obtain optical compensation. [0003] Generally, a circular polarizing plate which is one of the above-mentioned optical films can be manufactured by combining a polarizing film and a λ / 4 plate. However, the λ / 4 plate has the characteristic that the shorter the wavelength, the larger the retardation value it provides, which is the so-called "positive wavelength dispersion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/13363
CPCG02F2413/08G02B5/3016G02F1/13363G02F2413/13G02B5/305G02F2413/04G02F2413/12G02F2001/133638G02F1/133638
Inventor 川本育郎梅本清司
Owner NITTO DENKO CORP