Abstract: An ocular optical system includes a light guiding prism that guides image light from a display element and an emission portion that emits the image light guided by the light guiding prism. The light guiding prism includes a plurality of sides arranged to surround a light path of the image light, and a reflection surface off which the image light is reflected to the emission portion. The plurality of sides include a first side that is arranged on an opposite side of a first plane including first and second optical axes and that is situated between the emission portion and the reflection surface, wherein the first optical axis is a portion of the image light before the image light is reflected off the reflection surface, and the second optical axis is a portion of the image light after the image light is reflected off the reflection surface.

Abstract: An attachable image display device includes a light guiding prism that guides image light from a display element, and an eyepiece that emits the image light guided by the light guiding prism, wherein the light guiding prism includes an outer peripheral surface, and a reflection surface off which the image light is reflected to the eyepiece; and a portion of or the entirety of an intersection line of the outer peripheral surface and a plane including an optical axis of the image light before the image light is reflected off the reflection surface has a negative inclination angle to the optical axis in a direction downstream of the light path, and a tangential inclination angle of the portion of or the entirety of the intersection line becomes gradually larger from an upstream side to a downstream side of the light path.

Abstract: An attachable image display device includes a light guiding prism that guides image light from a display element, and an eyepiece that emits the image light guided by the light guiding prism, wherein the light guiding prism includes an outer peripheral surface, and a reflection surface off which the image light is reflected to the eyepiece; and a portion of or the entirety of an intersection line of the outer peripheral surface and a plane including an optical axis of the image light before the image light is reflected off the reflection surface has a negative inclination angle to the optical axis in a direction downstream of the light path, and a tangential inclination angle of the portion of or the entirety of the intersection line becomes gradually larger from an upstream side to a downstream side of the light path.

Abstract: An ocular optical system includes a light guiding prism that guides image light from a display element and an emission portion that emits the image light guided by the light guiding prism. The light guiding prism includes a plurality of sides arranged to surround a light path of the image light, and a reflection surface off which the image light is reflected to the emission portion. The plurality of sides include a first side that is arranged on an opposite side of a first plane including first and second optical axes and that is situated between the emission portion and the reflection surface, wherein the first optical axis is a portion of the image light before the image light is reflected off the reflection surface, and the second optical axis is a portion of the image light after the image light is reflected off the reflection surface.

Abstract: Various embodiments of a head-mountable display system can be adapted to allow users to see through or above or below the display assembly. Such range of vision can be achieved by positioning the display assembly into display pods housed in clear plastic; forming the frame into an “S”-shape positioned on the bridge of the nose so as to allow the user to see over it; positioning retractable display pods into a hard support frame, or other means. Various parts of the head-mountable display system, such as temple arms, ear phones, display assembly, and the head band, can be modified so as to achieve ergonomically optimal solution.