JP-2026076016-A - Head-mounted displays and light field displays

JP2026076016AJP 2026076016 AJP2026076016 AJP 2026076016AJP-2026076016-A

Abstract

[Solution] A light field display of the flat panel type comprising a flat panel display, a lens array, and an aperture array arranged in one direction, wherein the flat panel display has a plurality of pixels arranged in two dimensions, the lens array has a plurality of lenses arranged in two dimensions, each of which images light rays emitted from a group of pixels consisting of a plurality of pixels arranged adjacent to each other in the flat panel display, and the aperture array is arranged adjacent to the lens array and has a plurality of apertures arranged in two dimensions so as to correspond one-to-one with the plurality of lenses, and each of the plurality of apertures includes at least one aperture of any shape that is a circle, an ellipse, or a polygon, having an area smaller than the area of the corresponding lens among the plurality of lenses in a planar view. [Selection Diagram] Figure 1

Inventors

高木康博

Assignees

国立大学法人東京農工大学

Dates

Publication Date: 20260511
Application Date: 20241023

Claims (17)

A flat-panel type light field display comprising a flat panel display, a lens array, and an aperture array arranged in one direction, The flat panel display has a plurality of pixels arranged in two dimensions, The lens array has a plurality of lenses arranged in two dimensions, and each of the plurality of lenses images a light ray emitted from a group of pixels consisting of a plurality of pixels arranged adjacent to each other in the flat panel display. The aperture array is positioned adjacent to the lens array and has a plurality of apertures arranged two-dimensionally to correspond one-to-one with the plurality of lenses, and each of the plurality of apertures includes at least one aperture of a circular, elliptical, or polygonal shape having an area smaller than the area of the corresponding lens among the plurality of lenses in a plan view. Light field display.
The aperture array is a transmissive display in which the shape of at least one of the apertures is electronically controllable. The light field display according to claim 1.
The transparent display changes the shape of at least one of the openings in each of the openings over time. The light field display according to claim 2.
The transmissive display alternately displays, in each of the apertures, a circular annular aperture whose center coincides with the optical axis of the corresponding lens and whose center is shielded from light, and a circular small-diameter aperture whose center coincides with the optical axis of the corresponding lens and whose area in a plan view is less than half the area of the corresponding lens. The light field display according to claim 3.
The transparent display makes the shape of at least one of the openings of each opening different depending on its position in the two-dimensional plane in which the plurality of openings are arranged. The light field display according to claim 2.
The transmissive display displays, depending on the position of each opening in the plane, a circular annular opening whose center coincides with the optical axis of the corresponding lens and whose center is shielded from light, or a circular small-diameter opening whose center coincides with the optical axis of the corresponding lens and whose area in a plan view is less than or equal to half the area of the corresponding lens. The light field display according to claim 5.
The plurality of pixels of the flat panel display are arranged in one direction closer to the lens array than the focal plane of the lens array, thereby displaying a virtual three-dimensional image in the air. The light field display according to claim 1.
A head-mounted display comprising the light field display described in claim 7.
A head-mounted display comprising a light field display as described in claim 7, and a lens that further forms a virtual image of the virtual image thereof.
In a plan view, the area of at least one of the openings is 80% or less of the area of the corresponding lens. The light field display according to claim 1.
Each of the aforementioned openings includes a circular annular opening whose center coincides with the optical axis of the corresponding lens and whose center is shielded from light. The light field display according to claim 1.
Each of the aforementioned openings includes four small circular apertures, which, in a plan view, are positioned at equal intervals from each other around the optical axis of the corresponding lens and each has a radius of no more than 1/(1+√2) times the radius of the corresponding lens. The light field display according to claim 1.
Each of the aforementioned openings includes a single circular small-diameter opening whose center coincides with the optical axis of the corresponding lens and whose area in a plan view is less than or equal to half the area of the corresponding lens. The light field display according to claim 1.
The flat panel display, the aperture array, and the lens array are arranged in this order in the aforementioned one direction. The light field display according to claim 1.
The flat panel display, the lens array, and the aperture array are arranged in this order in the aforementioned one direction. The light field display according to claim 1.
The plurality of lenses in the lens array and the plurality of apertures in the aperture array are arranged orthogonally in two dimensions. The light field display according to claim 1.
The plurality of lenses in the lens array and the plurality of apertures in the aperture array are arranged in a honeycomb pattern in two dimensions. The light field display according to claim 1.

Description

This invention relates to a head-mounted display and a light field display. Patent Document 1 states, "In order to make the width of the magnified image of one pixel 1a smaller than the lens pitch p, and to make the magnified images of multiple pixels 1a visible through one lens 2a, and to eliminate crosstalk between light rays and enable blur-free stereoscopic display, an aperture array 3 is introduced and the width of the aperture 3a is made to match the width of the magnified image of pixel 1a, so that one pixel 1a is visible through one lens 2a" (0038). [Prior art documents] [Patent Documents] [Patent Document 1] Japanese Patent Application Publication No. 2021-165790 In a first embodiment of the present invention, a flat-panel light field display is provided, comprising a flat panel display, a lens array, and an aperture array arranged in one direction. In the light field display, the flat panel display has a plurality of pixels arranged in two dimensions; the lens array has a plurality of lenses arranged in two dimensions, each of which images light rays emitted from a group of pixels adjacent to each other in the flat panel display; and the aperture array is arranged adjacent to the lens array and has a plurality of apertures arranged in two dimensions in a one-to-one correspondence with the plurality of lenses, each of which includes at least one aperture of a circular, elliptical, or polygonal shape having an area smaller than the area of the corresponding lens among the plurality of lenses in a plan view. In the light field display described above, the aperture array may be a transmissive display capable of electronically controlling the shape of at least one of the apertures. In any of the above-described light field displays, the transmissive display may change the shape of at least one of the apertures in each of the apertures over time. In any of the above-described light field displays, the transmissive display may alternately display, at each of the apertures, a circular annular aperture whose center coincides with the optical axis of the corresponding lens and whose center is shielded from light, and a circular small-diameter aperture whose center coincides with the optical axis of the corresponding lens and whose area in a plan view is less than or equal to half the area of the corresponding lens. In any of the light field displays described above, the transmissive display may vary the shape of at least one of the apertures in each of the apertures according to their position in the two-dimensional plane in which the plurality of apertures are arranged. In any of the above-described light field displays, the transmissive display may, depending on the position of each opening in the plane, display either a circular annular opening whose center coincides with the optical axis of the corresponding lens and whose center is shielded, or a circular small-diameter opening whose center coincides with the optical axis of the corresponding lens and whose area in a plan view is less than or equal to half the area of the corresponding lens. In any of the above-described light field displays, the plurality of pixels of the flat panel display are arranged in one direction closer to the lens array than the focal plane of the lens array, thereby allowing a virtual three-dimensional image to be displayed in mid-air. In a second embodiment of the present invention, a head-mounted display is provided. The head-mounted display comprises any of the light field displays described above. In a third aspect of the present invention, a head-mounted display is provided. The head-mounted display comprises one of the above-described light field displays and a lens that further forms a virtual image of the virtual image. In any of the above-described light field displays, in a plan view, the area of at least one of the apertures may be 80% or less of the area of the corresponding lens. In any of the light field displays described above, each of the apertures may include a single circular annular aperture whose center coincides with the optical axis of the corresponding lens and whose center is shielded from light. In any of the above light field displays, each aperture may include four small circular apertures, each positioned equally apart from the others around the optical axis of the corresponding lens in a plan view, and each having a radius no more than 1/(1+√2) times the radius of the corresponding lens. In any of the above light field displays, each of the apertures may include a single circular small-diameter aperture whose center coincides with the optical axis of the corresponding lens and whose area in a plan view is less than or equal to half the area of the corresponding lens. In any of the above-described light field displays, the flat panel display, the aperture array, and the lens array may be arranged in this order in the aforementioned one-way direction. In any of the above-described light field displ