Polarizing plate, image display device, and improvement method of photopic contrast in image display device

An image display device and polarizer technology, applied in polarizing elements, optics, instruments, etc., can solve the problems of darkening of displayed images, decreased visibility, and difficulty in seeing, etc., to improve light transmittance, improve contrast in bright places, The effect of ensuring visibility

Inactive Publication Date: 2015-04-15
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Outdoors, observers sometimes wear polarized sunglasses. When the observer watches the display image of the liquid crystal display device through the polarized sunglasses, the angle formed by the absorption axis of the upper polarizer and the absorption axis of the polarized sunglasses may make the display image Dim to hard to see, reduced visibility

Method used

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  • Polarizing plate, image display device, and improvement method of photopic contrast in image display device
  • Polarizing plate, image display device, and improvement method of photopic contrast in image display device
  • Polarizing plate, image display device, and improvement method of photopic contrast in image display device

Examples

Experimental program
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Effect test

Embodiment 1

[0145] (Production of light-transmitting film)

[0146] The polyethylene terephthalate material is melted at 290°C, extruded in sheet form through a film-forming die, and then cooled in close contact with a water-cooled rotating quenching drum to produce an unstretched film. This unstretched film was preheated at 120°C for 1 minute using a biaxial tensile tester (manufactured by Toyo Seiki), and then uniaxially stretched 4.0 times at 120°C to obtain birefringence in the plane. transparent film. The refractive index n of the light-transmitting film at a wavelength of 550nm x =1.701, n y =1.6015, Δn=0.0995. The film thickness of this translucent film was 75 micrometers, and Re=7500 nm.

[0147] (production of polarizer)

[0148] A polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm was immersed in pure water at 30°C, and then immersed in pure water at 30°C with a weight rati...

Embodiment 2

[0151] The polarizing plate of Example 2 was produced in the same manner as in Example 1 except that the angle formed by the absorption axis of the polarizing element and the fast axis of the translucent film was 10 degrees.

Embodiment 3

[0153] The polarizing plate of Example 3 was produced in the same manner as in Example 1 except that the angle formed by the absorption axis of the polarizing element and the fast axis of the translucent film was 15 degrees.

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Abstract

The invention provides a polarizing plate, an image display device, and improvement method of photopic contrast in the image display device. When a viewer watches images displayed on a liquid crystal display device through polarized sunglasses, a certain degree of visibility under an orthogonal Nicole state can be ensured. Compared with the condition that a transparent film having birefringence disposed in a surface according to the angle being 45 DEG of a fast axis direction with respect to the absorption axis direction of a polarization element, the transmittance under a parallel Nicole state suitable for common observation can be improved, and the photopic contract when a viewer watches the image display device with eyes without wearing the polarized sunglasses can be improved.

Description

technical field [0001] The present invention relates to a polarizing plate, an image display device and a method for improving bright contrast of the image display device. Background technique [0002] In a liquid crystal display device, a polarizing plate (upper polarizing plate) is usually disposed on the image display surface side of the liquid crystal cell. The upper polarizer is usually composed of a polarizing element, such as a polyvinyl alcohol film dyed with iodine and stretched, and a protective film attached to one side of the polarizing element to protect the polarizing element. [0003] Conventionally, a film composed of cellulose ester represented by triacetyl cellulose has been used as a protective film. This is based on the following advantages: Since cellulose ester is excellent in transparency and optical isotropy, and has moderate water permeability, the moisture remaining in the polarizing element can be passed through the cellulose ester film when the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/305G02B5/3083G02B1/04G02B27/36G02F1/133502G02B1/14G02F1/133638
Inventor 黑田刚志
Owner DAI NIPPON PRINTING CO LTD
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