Optical element and display device

Abstract

The invention provides an optical element and a display device capable of reducing leaks of image light to an opposite side of an observer after passes through a light guiding body. The optical element includes a plurality of partially reflecting mirrors provided in parallel to each other with an interval therebetween, and reflecting partial image light and external light and allowing the other part of the image light and external light to pass through, and a transmittance member interposed between adjacent two partially reflecting mirrors of the plurality of partially reflecting mirrors. Thetransmittance member has an incidence surface on which an image light and an external light are incident through a light guiding body, and an exit surface from which the image light and the external light are exited to an observer side. Each of the plurality of partially reflecting mirrors is disposed so as to be inclined with respect to the incidence surface and the exit surface, and a reflectance of light incident at a relatively small incidence angle with respect to surfaces of each partially reflecting mirror is lower than a reflectance of light incident at a relatively large incidence angle.

Description

technical field [0001] The present invention relates to an optical element and a display device. Background technique [0002] In recent years, as one of wearable information devices, an image display device of a type that is worn on the head of an observer and used, such as a head-mounted display, has been provided. Also known is a so-called see-through image display device that can simultaneously visually recognize both an image generated by a display element and an image of the outside world when the observer wears the image display device. [0003] Patent Document 1 below discloses a head-mounted display system including a substrate and a plurality of partial reflection surfaces provided inside the substrate. In this system, part of the light guided inside the substrate is reflected by the plurality of partially reflective surfaces and guided to the eyes of the observer. In Patent Document 1, as an example of the reflection characteristics of the partially reflecting s...

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Problems solved by technology

In Patent Document 2, as an example of the reflection characteristics of the selective reflection surface, it is described that the reflectance decreases as the incident angle of light increases.

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