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Elliptically polarizing plate and method of producing the same

A technology of ellipsoidal polarization and polarizer, which is applied in the field of manufacture of the elliptical polarizer, can solve the problems of reduced output, reduced productivity, difficulty in high precision, etc., and achieves the effects of reduced thickness, good production efficiency and good yield

Inactive Publication Date: 2007-06-06
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a process of connecting oblique cutting sheets, thereby not increasing the production capacity, and lowering the yield due to the low precision of the angle control when laminating with the compensation film, resulting in a great increase in cost
Also, for example, the use of tape at the point where it will be bonded may cause problems such as loss of the point in the product, step height caused by the tape at the bonding point, failure of the connection of the linear polarizer, etc.
However, this method requires oblique stretching of the PVA film
Oblique-stretching makes it difficult to stretch at a specific angle with high precision compared to vertical uniaxial stretching or horizontal uniaxial stretching, resulting in decreased productivity and increased cost
[0016] As mentioned above, it is currently difficult to manufacture elliptically polarizers by a roll-to-roll lamination process while satisfying all aspects of continuity of the lamination process, increased yield, reduced material loss and reduced cost

Method used

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  • Elliptically polarizing plate and method of producing the same
  • Elliptically polarizing plate and method of producing the same
  • Elliptically polarizing plate and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (a) Rolled 1 / 4 wave plate

[0077] A photo-alignment layer is used to directionally polymerize the liquid crystal compound along one side of a roll-shaped substrate that is obtained by saponifying a triacetyl cellulose film with a thickness of 80 μm ("Fujitac TF80UL", available from Fuji Photo Film Co. , Ltd.) and produced a roll-shaped quarter-wave plate having a slow axis in a direction inclined at an angle of 45°C in the film plane relative to the longitudinal direction of the roll-shaped transparent substrate .

[0078] (b) Rolled linear polarizing film

[0079] Using a dry method, a rolled polyvinyl alcohol film with a thickness of 75 μm, an average degree of polymerization of about 2,400 and a degree of saponification of 99.9 mol% or more is uniaxially stretched at a stretching magnification of 5 times, and then the strain is maintained while , Immerse in an aqueous solution of iodine / potassium iodide / water with a weight ratio of 0.05 / 5 / 100 at 28°C for 60 seconds. The...

Embodiment 2

[0085] When the rolled elliptically polarizing plate (width 100 mm × length 5 m, the longitudinal direction is parallel to the absorption axis of the linear polarizing plate) obtained in Example 1, the sheet-shaped elliptical polarizing plate (length 100 mm × width 50 mm) is cut so that the length direction is in the linear polarization In the direction of the absorption axis of the sheet, 100 elliptically polarizing sheets without joints can be cut out. In this embodiment, the extraction efficiency R calculated by the above formula (1) is 100%.

Embodiment 3

[0087] When the rolled elliptically polarizing plate (width 100 mm × length 5 m, the longitudinal direction is parallel to the absorption axis of the linear polarizing plate) obtained in Example 1, the sheet-shaped elliptical polarizing plate (length 50 mm × width 50 mm) is cut so that the length direction is in the linear polarization In the direction of the absorption axis of the sheet, 200 elliptically polarizing sheets without joints can be cut out. In this embodiment, the extraction efficiency R calculated by the above formula (1) is 100%.

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Abstract

A rolled elliptically polarizing plate that is made by laminating a compensation film 13 having a coated layer made by a coating agent performing a compensation function on the surface of a rolled linear polarizing plate, the compensation film being a rolled film formed by application of a coating agent performing a compensation function to the surface of a transparent substrate, the linear polarizing plate and the compensation film being laminated by means of roll to roll processing by making the respective longitudinal directions approximately in parallel, or the above compensation film being formed by application of a coating agent performing a compensation function to the surface of the rolled linear polarizing plate.

Description

Technical field [0001] The present invention relates to an elliptical polarizer used in displays such as liquid crystal displays and organic electronic light emitting displays. The elliptical polarizer has good production efficiency and yield, and is suitable for reducing the thickness of devices. The present invention also relates to a method of manufacturing the elliptically polarizing plate. The present invention also relates to displays using the elliptically polarizing plate, such as liquid crystal displays, organic electronic light emitting displays, touch panels and the like. Background technique [0002] An elliptically polarizing plate used for a display such as a liquid crystal display is generally constructed by laminating a linear polarizing plate and a compensation film. In other words, the linear polarizer and the compensation film are laminated by an adhesive or the like so that the absorption axis of the linear polarizer and the retardation axis of the compensatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/10G02B1/04G02F1/1335G02F1/133
CPCG02B5/3016Y10T428/1041C09K2323/031G02B5/30
Inventor 林秀树松冈祥树
Owner SUMITOMO CHEM CO LTD
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