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Polarizing plate with optical compensating layer, and image display using the same

A technology of optical compensation layer and polarizing plate, which is applied in the field of polarizing plate, can solve problems that have not been solved, and achieve the effects of improving light leakage, reducing thickness, and reducing thickness

Active Publication Date: 2007-01-31
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in conventional VA-mode reflective or transflective liquid crystal display devices, the problems of light leakage and contrast reduction during black display have not been solved for a long time.

Method used

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  • Polarizing plate with optical compensating layer, and image display using the same
  • Polarizing plate with optical compensating layer, and image display using the same
  • Polarizing plate with optical compensating layer, and image display using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0189] (production of polarizers)

[0190] A commercially available polyvinyl alcohol (PVA) film (purchased from Kuraray Co., Ltd.) was dyed in an iodine-containing aqueous solution and uniaxially stretched between rollers with different speed ratios to about 6 in an aqueous solution containing boric acid. times the length to obtain a continuous polarizer. A commercially available TAC film (purchased from Fuji Photo Film Co., Ltd.) was adhered to both sides of the polarizer with a PVA-based adhesive to obtain a polarizer (protective film / polarizer / protective film) with a total thickness of 100 μm. membrane). This polarizing plate was punched out to a length of 20 cm x a width of 30 cm, and the absorption axis of the polarizing plate was set in the longitudinal direction.

[0191] (production of the first optical compensation layer)

[0192] At 140°C, a continuous norbornene-based resin film (trade name, Zeonoa, purchased from Zeon Corporation, with a thickness of 60 μm and ...

Embodiment 2

[0205] A polarizing plate, a first optical compensation layer, and a second optical compensation layer were produced in the same manner as in Example 1.

[0206] (production of third optical compensation layer)

[0207] A continuous norbornene-based resin film (trade name, Arton, purchased from JSR Corporation, with a thickness of 100 μm and a photoelastic coefficient of 5.00×10 -12 m 2 / N) was longitudinally stretched to 1.27 times the length at 175°C, and then transversely stretched to about 1.37 times at 176°C to prepare a continuous film (thickness 65 μm) for the third optical compensation layer. The film was punched out to a length of 20 cm x a width of 30 cm, thereby forming a third optical compensation layer. The in-plane retardation Re of the third optical compensation layer 3 0nm, thickness direction retardation Rth 3 110nm.

[0208] (Production of polarizing plates equipped with optical compensation layers)

[0209] Except that the second optical compensation l...

Embodiment 3

[0211] A polarizing plate, a first optical compensation layer, and a second optical compensation layer were produced in the same manner as in Example 1.

[0212] Use the liquid crystal coating solution prepared in the same manner as in Example 1 to coat the substrate (biaxially stretched PET film), heat-treat it at 80° C. for 3 minutes, and irradiate the liquid crystal coating solution with ultraviolet light to carry out polymerization treatment, Thus, a cholesteric alignment-fixed layer (thickness: 2 µm) was formed. Subsequently, an isocyanate-based curable adhesive (5 μm in thickness) was applied to the cholesteric alignment-fixed layer, and a plastic film (TAC film, 40 μm in thickness) was adhered thereto through the adhesive, thereby forming the first Three optical compensation layers. The third optical compensation layer was punched out to a length of 20 cm x a width of 30 cm. The thickness of the third optical compensation layer is 47 μm, the in-plane retardation Re 3...

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Abstract

A polarizing plate with an optical compensation layer capable of appropriately preventing leakage of light in black display while preventing thermal unevenness and contributing to reduction in thickness, and an image display employing it. The polarizing plate with an optical compensation layer comprises a polarizer, a first optical compensation layer, a second optical compensation layer, and a third optical compensation layer arranged in this order. The first, second and third optical compensation layers respectively have a predetermined absolute value of photoelastic coefficient, refractive index distribution, in-plane phase difference and / or phase difference in the thickness direction, respectively. The angle between the absorption axis of the polarizer and the lag axis of the first optical compensation layer is 10-30 DEG, the angle between the absorption axis of the polarizer and the lag axis of the second optical compensation layer is 70-95 DEG, and the angle between the absorption axis of the polarizer and the lag axis of the third optical compensation layer is 70-95 DEG.

Description

technical field [0001] The present invention relates to a polarizing plate provided with an optical compensation layer, and an image display device using the polarizing plate. Specifically, the present invention relates to a polarizing plate provided with an optical compensation layer that can contribute to thickness reduction and prevent uneven display due to heat, and can well prevent light leakage during black display, and an image display using the polarizing plate. device. Background technique [0002] Among the VA mode liquid crystal display devices, besides the transmissive liquid crystal display device and the reflective liquid crystal display device, a transflective liquid crystal display device has also been proposed (for example, see JP11-242226A and JP2001-209065A). A transflective liquid crystal display device utilizes external light like a reflective liquid crystal display device in a bright place, and allows a display to be recognized with an internal light s...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/13363G02F1/1335
Inventor 千叶刚冈田裕之北村吉绍首藤俊介
Owner NITTO DENKO CORP
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