Films that increase transmittance

Abstract

A transmittance improving film in which a low refractive index layer is directly laminated on the surface of a transparent base film, said low refractive index layer having a lower refractive index than the transparent base film. The low refractive index layer is composed of hollow silica fine particles, an active energy ray-curable resin that does not contain a fluorine atom, a photopolymerization initiator and alumina fine particles. Relative to 100 wt% of the total of the above-described components, 28.0-69.0 wt% of the hollow silica fine particles, 27.0-69.0 wt% of the active energy ray-curable resin that does not contain a fluorine atom, 1.0-9.0 wt% of the photopolymerization initiator and 0.1-0.9 wt% of the alumina fine particles are contained. An overcoat layer may optionally be laminated on the back surface of the transparent base film.

Description

technical field [0001] The present invention relates to a transmittance-enhancing film applied to, for example, the back surface of a positioning device (position input device) constituting a touch panel. Background technique [0002] Touch panels that perform input operations based on on-screen instructions are widely used because they are intuitive, easy to understand, and easy to operate. This kind of touch screen has two functions of display and input, and its structure is usually a combination of a display device such as a liquid crystal panel and a positioning device such as a touch panel. However, since the positioning device is interposed between the user and the display device, there are problems of low total light transmittance and poor visibility of the touch screen. For this reason, a method of affixing a transmissivity-enhancing film to the back of the positioning device with double-sided tape to improve visibility is generally employed. [0003] Conventionall...

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