Resin sheet, liquid crystal cell substrate, liquid crystal display device, substrate for an electroluminescence display device, electroluminescence display device, and a substrate for a solar cell

Abstract

There is provided a resin sheet that achieves improvement in lightweight, low-profile and high impact characteristics, suppresses thermal shrinkage and expansion and is excellent in light transparency so as to prevent the display quality or the like of a display device from being deteriorated, as well as a substrate for a display device, a display device and a substrate for a solar cell, each having the aforesaid resin sheet. A resin sheet includes a cured resin layer containing a glass fiber cloth-like material and an overcoat layer laminated on the cured resin layer to have a surface roughness Rt of 200 nm or less, and is structured to have a haze value of 10% or lower.

Description

FIELD OF THE INVENTION [0001] The present invention relates mainly to a resin sheet suitable for use in a display device, as well as a substrate for a display device, a display device and a substrate for a solar cell, each including the resin sheet. BACKGROUND OF THE INVENTION [0002] For liquid crystal display devices, electroluminescence display devices and the like, it is proposed to use plastic substrates in place of conventional glass substrates for progress in making displays lightweight, low-profile and high impact. Whilst substrates of the above type are required to have a low coefficient of thermal expansion, plastic substrates may pose a problem of causing misalignment when forming, for example, electrodes or color filters, due to thermal shrinkage and expansion, since plastic has a higher coefficient of linear expansion than glass. [0003] Although those of various active matrix driving types are recently used especially in the field of liquid crystal display devices thanks...

AI Technical Summary

Benefits of technology

[0013] With the resin sheet of the present invention, the cured resin layer containing the glass fiber cloth-like material as provided can realize lightweight, low-profile, and improvement in impact resistance, and suppress thermal shrinkage and expansion. Therefore, it is possible to prevent misalignment of an electrode, a color filter or the like as mentioned above when used as a liquid crystal cell substrate for forming a liquid crystal panel.

[0014] In the resin sheet of the present invention, an overcoat layer is laminated on the cured resin layer to have a surface roughness of 200 nm or less, thereby eliminating unevenness due to the glass fiber cloth-like material; and the resin sheet is structured to have a haze value of 10% or lower, thereby achieving reduced light diffusion and thus providing a resin sheet that is remarkably excellent in light transparency. Therefore, when used as a liquid crystal cell substrate, a substrate for an electroluminescence display device or the like, the display quality of a display device becomes excellent. Furthermore, a substrate for a solar cell including the resin sheet may contribute to the improvement in power generating efficiency of the solar cell.

Problems solved by technology

Whilst substrates of the above type are required to have a low coefficient of thermal expansion, plastic substrates may pose a problem of causing misalignment when forming, for example, electrodes or color filters, due to thermal shrinkage and expansion, since plastic has a higher coefficient of linear expansion than glass.

Although those of various active matrix driving types are recently used especially in the field of liquid crystal display devices thanks to the excellent display quality compared with passive matrix driving types, the above problem is more significant in the liquid crystal display devices of the active matrix driving types because they are required to have a lower coefficient of thermal expansion than the passive matrix driving types.

Another problem associated with plastic substrates is that the mechanical strength thereof is relatively low.

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