Image display device

Abstract

A thin image display device is provided which is free from display defects caused by the deformation of an image display part and can display high brightness and high contrast images. The image display device includes an image display part 2, a light-transmitting protective part 3 arranged on the image display part, and a cured resin layer 5 interposed between the image display part 2 and the protective part 3. The cured resin layer 5 has a light transmittance in the visible region of 90% or more and a refractive index (nD) of 1.45 or more and 1.55 or less.

Description

TECHNICAL FIELD[0001]The present invention relates to an image display device such as a liquid crystal display device (LCD) used, for example, in a cellular phone, and in particular to an image display device that includes a transparent protective part arranged on an image display part and a cured resin layer arranged between the image display part and the protective part.BACKGROUND ART[0002]One conventional example of such an image display device is a liquid crystal display device 101 shown in FIG. 4.[0003]This liquid crystal display device 101 includes a transparent protective part 103 made of, for example, glass or plastic on a liquid crystal display panel 102, as shown in FIG. 4.[0004]In this display device, to protect the surface of the liquid crystal display panel 102 and a polarizing plate (not shown), a spacer 104 is arranged between the liquid crystal display panel 102 and the protective part 103 to form a gap 105 between the liquid crystal display panel 102 and the protect...

AI Technical Summary

Benefits of technology

[0019]In the present invention, the cured resin layer arranged between the image display part and the protective part has a light transmittance of 90% or more and a refractive index (nD) of 1.45 or more and 1.55 or less and more preferably, for example, 1.51 or more and 1.52 or less. In this manner, as compared to the case in which air having a refractive index of 1.0 is arranged therebetween, the differences in refractive index at the interface of the image display part and the interface of the protective part are smaller, so that the scattering and attenuation of image light from the image display part can be reduced. Therefore, according to the present invention, the brightness and contrast of the displayed image can be increased, whereby the visibility can be improved.

[0020]In the present invention, the use of a resin composition having a curing shrinkage ratio of 5% or less and yielding a cured product having a storage modulus at 25° C. of 1.0×107 Pa or less can minimize the influence of the stress during cure shrinkage of the resin on the image display part and the protective part. Therefore, almost no distortion occurs in the image display part and the protective part.

[0021]Accordingly, a high brightness and high contrast image can be displayed without display defects.

[0022]In particular, when the image display part is a liquid crystal display panel, display defects such as irregularities in the orientation of the liquid crystal material can be reliably prevented, so that a high quality image can be displayed.

[0023]Moreover, in the present invention, the gap between the image display part and the protective part is filled with the cured resin. This provides high impact resistance.

[0024]In addition, an image display device thinner than the conventional example in which a gap is formed between the image display part and the protective part can be provided.

Problems solved by technology

In addition, the presence of the gap 105 also makes it difficult to produce thinner display panels.

However, the stress during cure shrinkage of the cured resin causes deformation of optical glass plates sandwiching the liquid crystal of the liquid crystal display panel.

This results in display defects such as irregularities in the orientation of the liquid crystal material.

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