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Phase difference plate, polarizing plate with optical compensation layer, image display device, and image display device with touch panel

A technology of image display device and optical compensation layer, applied in optics, identification device, polarizing element, etc., can solve problems such as coloring

Active Publication Date: 2022-04-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the conventional retardation film is used in a polarizing plate with an optical compensation layer, there is a problem that undesired coloring may occur in the hue in the oblique direction.

Method used

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  • Phase difference plate, polarizing plate with optical compensation layer, image display device, and image display device with touch panel
  • Phase difference plate, polarizing plate with optical compensation layer, image display device, and image display device with touch panel
  • Phase difference plate, polarizing plate with optical compensation layer, image display device, and image display device with touch panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] 1. Production of polycarbonate resin

[0089] Polymerization was carried out using a batch polymerization apparatus comprising two vertical reactors equipped with stirring blades and a reflux cooler controlled at 100°C. Add 29.60 parts by mass (0.046 moles) of bis[9-(2-phenoxycarbonylethyl)fluoren-9-yl]methane (compound 3), 29.21 parts by mass (0.200 moles) of ISB, 42.28 parts by mass (0.139 moles) of SPG ), DPC 63.77 parts by mass (0.298 moles), calcium acetate monohydrate 1.19×10 -2 Parts by mass (6.78×10 -5 Moore). After the inside of the reactor was replaced with nitrogen under reduced pressure, it was heated with a heat medium, and stirring was started when the internal temperature reached 100°C. 40 minutes after the start of the temperature rise, the internal temperature was controlled to be 220° C. to maintain the temperature. At the same time, the pressure was reduced, and it took 90 minutes after the temperature reached 220° C. to be 13.3 kPa. The phenol va...

Embodiment 2

[0113] In the preparation process of the phase difference plate, except having used the liquid crystal solidified layer formed by setting the thickness of the liquid crystal solidified layer to 1.1 micrometers, it carried out similarly to Example 1, and obtained the phase difference plate.

[0114] Re(550) of the liquid crystal solidified layer was 0 nm, Rth(550) was -55 nm, Rth(450) / Rth(550) was 0.80, and Rth(650) / Rth(550) was 1.03.

[0115] Re(450) of the obtained retardation plate was 120 nm, Re(550) was 141 nm, Re(650) was 150 nm, Nz(450) was 0.71, Nz(550) was 0.74, and Nz(650) was 0.76.

[0116] Except having used the said retardation plate, it carried out similarly to Example 1, and obtained the polarizing plate with an optical compensation layer, and an organic electroluminescent display device substitute.

Embodiment 3

[0118] In the preparation process of the phase difference plate, except having used the liquid crystal solidified layer formed by setting the thickness of the liquid crystal solidified layer to 1.3 micrometers, it carried out similarly to Example 1, and obtained the phase difference plate.

[0119] Re(550) of the liquid crystal solidified layer was 0 nm, Rth(550) was -65 nm, Rth(450) / Rth(550) was 0.80, and Rth(650) / Rth(550) was 1.03.

[0120] Re(450) of the obtained retardation plate was 120 nm, Re(550) was 141 nm, Re(650) was 150 nm, Nz(450) was 0.66, Nz(550) was 0.67, and Nz(650) was 0.70.

[0121] Except having used the said retardation plate, it carried out similarly to Example 1, and obtained the polarizing plate with an optical compensation layer, and an organic electroluminescent display device substitute.

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Abstract

The present invention provides a retardation plate for an image display device capable of realizing a neutral hue in an oblique direction. The in-plane phase difference Re of the phase difference plate of the present invention satisfies 100nm≤Re(550)≤160nm, Re(450) / Re(550)≤1 and Re(650) / Re(550)≥1, and the Nz coefficient satisfies Nz (550)<1, 0≤|Nz(450)-Nz(550)|≤0.1 and 0≤|Nz(650)-Nz(550)|≤0.1.

Description

technical field [0001] The invention relates to a phase difference plate, a polarizer with an optical compensation layer, an image display device and an image display device with a touch panel. Background technique [0002] In recent years, along with the popularization of thin displays, image display devices (organic EL display devices) equipped with organic EL panels have been proposed. The organic EL panel has a highly reflective metal layer, which is prone to problems such as reflection of external light or reflection of the background. Therefore, it is known to prevent these problems by arranging a polarizing plate (circular polarizing plate) with an optical compensation layer on the viewing side. In addition, it is known that a viewing angle can be improved by providing a polarizing plate with an optical compensation layer on the viewing side of a liquid crystal display panel. As a general polarizing plate with an optical compensation layer, a polarizing plate obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G09F9/00G09F9/30H01L27/32H01L51/50H05B33/02H05B33/28
CPCH05B33/02H05B33/28G02B5/30G06F3/041G06F3/044G09F9/00G09F9/30H10K59/00H10K50/00G02B5/3083G02B5/3025G02F1/133528H10K59/50
Inventor 高松秀行
Owner NITTO DENKO CORP