Seiko Epson Corporation

Hayato Matsuki

Takashi Takeda

Shohei Yoshida

Osamu Yokoyama

Masayuki Takagi

Akira Komatsu

Toshiaki Miyao

Takahiro Totani

A wavelength converting element according to the present disclosure includes: a wavelength converting body including an incident surface and an exit surface and configured to perform wavelength conversion on a primary light in a first wavelength band, entered from the incident surface, thereby generating a secondary light in a second wavelength band, which differs from the first wavelength band, the wavelength converting body emitting the secondary light from the exit surface; a metallic antenna group provided in a close vicinity of the wavelength converting body and including a plurality of metallic antennas disposed so as to be spaced apart from each other at a distance of substantially an optical wavelength of the secondary light in the wavelength converting body; and a dielectric antenna group including a plurality of dielectric antennas and provided so as to face the exit surface of the wavelength converting body.

Wavelength converting element, light source device, and display device

A light guide system includes a transparent light guide portion that guides light beams incident from one end side to a light-emitting portion. The light guide portion includes a plurality of partial reflection surfaces that are disposed between a first surface and a second surface which are parallel to each other and are inclined at the same angle such that a first end portion is positioned closer to the one end side than a second end portion is. Intervals between the partial reflection surfaces in a first direction are widened from the one end side toward another end side. In a state where the light guide portion is disposed in front of an eye of an observer, the light guide portion is inclined such that the another end side is further away from a face of the observer than the one end side is.

Display apparatus and light guide device

Light guide system includes transparent light guide section that leads light inputted through one end portion, to an output section. The light guide section includes a plurality of partial reflection planes, each inclined at a same angle such that a first end portion is located on the side of the one end portion, with respect to a second end portion, and aligned between a first plane and a second plane parallel to each other. Pitches among the partial reflection planes in a first direction are widened toward another end portion, from the side of the one end portion. From an eye of a viewer, a wide overlapping portion is non-existent between two partial reflection planes adjacent to each other on the side of the another end portion, and a wide gap is non-existent between two partial reflection planes adjacent to each other on the side of the one end portion.

Light guide device and display device

A light-guiding device according to an aspect of the invention includes an incident section configured to make light incident, a light guide configured to guide the light incident from the incident section, a bonding layer configured to bond the incident section and the light guide, and a reflection member provided on a side surface of the bonding layer.

Light-guiding device and display device

A display apparatus includes an image generation system that emits image light beams as non-parallel light beams, and a light guide system on which the image light beams emitted from the image generation system are incident without passing through a projection lens system. The light guide system includes a transparent light-incident portion that includes a light-incident surface on which the image light beams are incident and which is a curved surface, and a plurality of reflection surfaces which convert the image light beams incident from the light-incident surface into parallel light beams and are curved surfaces, and a transparent light guide portion of which one end side in a first direction is connected to the light-incident portion. In the light guide portion, the image light beams incident from the light-incident portion are reflected between a first surface and a second surface, and are guided to a light-emitting portion.

Display apparatus

A light guide device used in a display apparatus includes a transparent light guide portion that guides light beams incident from one end side to a light-emitting portion. The light guide portion includes a plurality of partial reflection surfaces between a first surface and a second surface which are parallel to each other, the plurality of partial reflection surfaces being inclined at the same angle from a normal direction with respect to the second surface toward the one end side. In the plurality of partial reflection surfaces, an appropriate incident angle range of the partial reflection surface positioned on the one end side is set to a larger angle than that of the partial reflection surface positioned on another end side.

Light guide device and display apparatus

A display device of the invention includes: an image generation part configured to generate image light; a light guide being configured to guide the image light; and an emitting part configured to cause the image light to emit from the light guide toward an exit pupil, in which the emitting part includes a plurality of half mirrors which are disposed parallel to one another at an interval, each of the plurality of half mirrors being configured to reflect a part of the image light and cause another part of the image light to pass through the half mirror, and in at least one half mirror of the plurality of half mirrors, when Bmax represents a maximum luminance, Bmin represents a minimum luminance, and a luminance ratio R (%) is defined as R=[(Bmax&#x2212;Bmin)/Bmax]&#xd7;100, R&#x2264;30 is satisfied.

Display device

A light guide system (light guide device) includes a transparent light guide portion that guides light beams incident from one end side to a light-emitting portion. The light guide portion includes a first surface, a second surface which is parallel to the first surface, and a third surface which is positioned between the first surface and the second surface on another end side. A plurality of obliquely-inclined partial reflection surfaces are disposed between the first surface and the second surface, and the third surface is inclined in the same direction as that of the partial reflection surface. The third surface is configured with an anti-reflection surface for image light beams traveling through the light guide portion, and is covered by an anti-reflection film, a light absorption layer, a moth-eye type roughened surface, or the like. Therefore, occurrence of stray light due to reflection by the third surface can be suppressed.

An optical element includes partially reflecting mirrors provided in parallel to each other with an interval therebetween, reflect a part of image light and external light, and transmit another part of the image light and the external light; and a transmitting member interposed between adjacent two partially reflecting mirrors of the partially reflecting mirrors. The light-transmissive member includes an incidence surface on which the image light and the external light are incident and an exit surface from which the image light and the external light are exited. Each of the partially reflecting mirrors is disposed to be inclined with respect to the incidence surface and the exit surface. The partially reflecting mirrors include at least one first partially reflecting mirror and at least one second partially reflecting mirror having different reflectances with respect to predetermined polarized light components included in the image light and the external light.

Optical element and display device

An optical element includes a plurality of partially reflecting mirrors provided in parallel to each other with an interval therebetween, and a transmittance member interposed between adjacent two partially reflecting mirrors of the plurality of partially reflecting mirrors. The transmittance 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.

In an optical element, a first diffraction grating, a second diffraction grating, a third diffraction grating, and a fourth diffraction grating are formed in each of a first surface of a first substrate, a fourth surface of a second substrate, a fifth surface of a third substrate, and an eighth surface of a fourth substrate. Each substrate is fixed by (a first adhesive layer, second adhesive layer, and a third adhesive layer) adhesive layers including a gap material. A first filler with a refractive index equal to that of the first substrate and the second substrate is filled between the first substrate and the second substrate and a third filler formed of air or a medium with a refractive index equal to that of air is filled between the second substrate and the third substrate.

Optical element with spaced diffraction gratings, and display apparatus

There is provided a display apparatus including a light guide system that includes a light-incident portion including a light-incident curved surface on which image light beams as non-parallel light beams are incident and a light-reflective curved surface which reflects the image light beams such that the image light beams are converted into parallel light beams, and a light guide portion being a portion in which a plurality of partial reflection layers are disposed in parallel. The light guide portion is filled with a parallel light flux emitted from the light-incident portion. The light-incident portion is formed of a first transparent member, the portion in which the partial reflection layers are formed is formed of a second transparent member which is surface-bonded to the first transparent member via a bonding surface, and the bonding surface is inclined in the same direction as that of the partial reflection layer.

An optical element includes a plurality of partially reflecting surfaces which are provided in parallel to each other with intervals, reflect a portion of image light and external light, and transmit another portion of the image light or external light; and a light transmitting member which supports the plurality of partially reflecting surfaces, in which the light transmitting member includes an incident plane that enters the image light and the external light, and an emission plane that emits the image light and the external light, and each of the plurality of the partially reflecting surfaces is disposed so as to be inclined with respect to the incident plane and the emission plane, and has a plurality of regions having different reflectances in an inclination direction.

Optical element, display device, and manufacturing method for optical element

A light guide device includes an incident section, a parallel light guide body for light guide, and an emitting section. The emitting section includes a reflection unit formed by arraying a plurality of mirrors. The plurality of mirrors configuring the reflection unit are reflection elements having reflectance of P polarized light lower than reflectance of S polarized light. The plurality of mirrors configuring the reflection unit can be accompanied by wavelength plates to be adjacent to the mirrors.

Growing community of inventors

Suwa, Japan

Hayato Matsuki