Hitachi-lg Data Storage, Inc.

Takuma Kuno

Toshiteru Nakamura

Ryuji Ukai

Takahiro Mouri

Masahito Uchiyama

Satoshi Ouchi

Takeru Utsugi

Masataka Sugita

According to the invention, a light guide plate-type video display device and a video display system that are capable of displaying a video with less color deviation and less video distortion are provided. A video display deviceconfigured to display a video includes a video projection unitconfigured to project video light, a video deflection unit, and a light guide portion. The video deflection unitdeflects video light emitted by the video projection unitand causes the video light to propagate to the light guide portion, and the light guide portioncauses the entered video light to propagate therein and outputs the video light. Here, the video deflection unitor the light guide portionis configured to reduce color dispersion of the video light outputted from the light guide portion

Video display device and video display system

A head-mounted display achieves both miniaturization and high efficiency of an optical system and expansion of an eye box. In order to achieve the above-described object, a head-mounted display that displays an image within a visual field of a user is provided. The head-mounted display includes: an image display unit that generates an image to be displayed; a projection unit that projects image light from the image display unit; an image rotation and replication unit that expands an eye box of projection light from the projection unit; and a waveguide unit that transmits image light from the image rotation and replication unit to a pupil of the user. The image rotation and replication unit includes an incidence surface, an emission surface, and at least two reflection surfaces, and an angle formed by the incidence surface and the emission surface is greater than 90°.

Head-mounted display

The head-mounted display includes: an image display unit that generates an image to be displayed; and a first light guide plate and a second light guide plate which duplicate image light from the image display unit. Each of the first light guide plate and the second light guide plate includes a set of parallel main surfaces confining the image light with internal reflection, the first light guide plate includes an incident plane that reflects the image light to an inner side, and two or more emission/reflection planes from which the image light is emitted to the second light guide plate, the second light guide plate includes an input part that couples the image light transmitted from the first light guide plate to the inner side, and an output part from which the image light is emitted to a user's pupil.

A head mounted display displays an image in a user's view field and includes a projection unit projecting image light from an image display unit; and a first and second light guide plates that duplicate the image light from the projection unit. The first and second light guide plates each include a set of parallel main surfaces confining the image light by internal reflection. The first light guide plate includes an incident surface reflecting the image light inward, and two or more emission reflective surfaces emitting the image light to the second light guide plate. The incident and emission reflective surfaces are parallel to each other at an angle different from the main surface, and the second light guide plate includes an input unit coupling the image light from the first light guide plate inward, and an output unit emitting the image light to the user's pupil.

Head mounted display

A virtual image projection device that generates image light includes a light source that emits light; a microlens array that emits the light, which is emitted from the light source, as light having a predetermined angle distribution; an imaging lens that concentrates the light from the microlens array; a display unit that is irradiated with the light, which is concentrated by the imaging lens, to generate an image; and a projection unit that projects the image, which is generated by the display unit, as image light. The microlens array is disposed such that short side directions of lens cells do not line up straight.

Virtual image projection device

An image display device projecting an image to a user includes: an image generation unit that generates image light; a projection optical unit that projects the image light generated by the image generation unit; an image light duplication unit that duplicates and emits the image light projected by the projection optical unit; and a light-guiding unit that projects the image light duplicated by the image light duplication unit to a user, in which the projection optical unit includes at least one projection lens, and in which an interval at which the image light duplication unit duplicates the image light is smaller than an outer diameter of the projection lens.

Image display device and head mounted display using the same

To provide a wide eye box and are capable of displaying a video having uniform luminance, it is provided a video display apparatus comprising: a video projection unit configured to project video light; a video light replication unit configured to replicate the video light; and a light guiding unit configured to transmit the video light through an inside of the light guiding unit, wherein the video light replication unit is configured to transmit the video light emitted from the video projection unit to the light guiding unit, wherein the light guiding unit is configured to transmit the video light that has entered through the inside to output the video light, and wherein the video light replication unit is configured to replicate the video light that has entered the video light replication unit so that a luminance distribution of the video light output from the light guiding unit is uniform.

Video display apparatus and video display system

A light guide plate includes: first and second internal reflective surfaces that are approximately parallel and propagate incoming image light while totally reflecting the image light; a partially reflective surface array that has a plurality of partially reflective surfaces arranged in a direction of propagating image light, the partially reflective surfaces being inclined at a predetermined angle and partially reflecting the image light; and a uniforming element that uniforms intensity distribution of image light which is reflected by the partially reflective surface array to be projected from the light guide plate. As the uniforming element, the partially reflective surface array is divided into a plurality of segments along a direction of propagating image light, and the inter-surface spacing of the partially reflective surfaces or the reflectivity of the partially reflective surfaces is configured to vary from segment to segment.

Light guide plate and image display apparatus

A head mounted display has a display unit to generate a displayed image, an illumination unit to emit illumination light to the display unit, a projection unit to project image light from the display unit, and a light guide unit to transmit image light from the projection unit to pupils of a user. Here, the illumination unit has light source units, a microlens array that is illuminated by light emitted from the light source units and becomes a virtual secondary light source, a condensing optical member to focus light from the microlens array on the display unit, and a diffusion plate to diffuse light from the microlens array, and the diffusion plate is arranged closer to the condensing optical member than to the microlens array. As a result, a conjugate image is inhibited from being generated with the adoption of a microlens array.

Growing community of inventors

Tokyo, Japan

Takuma Kuno