CN211577479U

CN211577479U - Hexagonal columnar structure for diffraction optical waveguide

Info

Publication number: CN211577479U
Application number: CN202020061075.1U
Authority: CN
Inventors: 宋强; 许恒深; 黄浩; 马国斌; 汪涛
Original assignee: Long Optoelectronics Co Ltd
Current assignee: Long Optoelectronics Co Ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2020-09-25
Anticipated expiration: 2030-01-10

Abstract

The utility model discloses a hexagonal columnar structure for diffraction optical waveguide, including the micro-projection ray apparatus that is used for sending image light, the waveguide base plate that is used for forming the diffraction grating, the coupling grating that is used for receiving and conducting the micro-projection ray apparatus and sends image light and the coupling grating, the coupling grating is located the light inlet of waveguide base plate, and the coupling grating is located the light outlet of waveguide base plate, and the coupling grating is provided with a plurality of regular hexagonal prisms that are used for diffraction image light; the adjacent spacing distance of the regular hexagonal prism partitions is gradually reduced and is in axial symmetry distribution. The beneficial effects are that: the utility model provides an outcoupled grating is through the regular hexagonal prism of a plurality of partitions of design, and the regular hexagonal prism of a plurality of partitions is 60 contained angle array and arranges, fine solution the whole diffraction waveguide's of diffraction grating inefficiency and inhomogeneous, the problem that the projected image effect that the user saw is not good enough.

Description

Hexagonal columnar structure for diffraction optical waveguide

Technical Field

The utility model relates to a display device technical field, concretely relates to a hexagon columnar structure for diffraction optical waveguide.

Background

With the development of virtual reality and augmented reality technologies, near-to-eye display devices have been rapidly developed, such as google glass by google and Hololens by microsoft. Near-to-eye display of augmented reality is a technique that images a light field in real space and can simultaneously compromise virtual and real operations. The use of conventional optical waveguide components to couple image light into the human eye has been employed, including the use of prisms, mirrors, transflective optical waveguides, holograms and diffraction gratings. The optical waveguide display system realizes light wave transmission by utilizing a total reflection principle, realizes directional transmission of light by combining a diffraction element, and further guides image light to human eyes, so that a user can see a projected image.

For small-volume near-to-eye glasses, the main mode of light transmission is waveguide, and the waveguide mode is divided into: geometric array waveguide, diffraction grating waveguide and holographic waveguide, the diffraction grating waveguide is more and more emphasized due to the convenience of nano-imprinting processing and the high degree of freedom of the diffraction grating design, and the diffraction grating acts as a thin film in the array waveguide and mainly changes the propagation direction of light. However, the efficiency of the whole diffraction waveguide of the existing diffraction grating is low and uneven, and the definition of a projection image seen by a user is not high enough, which is a problem to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hexagon columnar structure for diffraction optical waveguide to solve the inefficiency and inhomogeneous of current diffraction grating's whole diffraction waveguide, the not good problem of projection image effect that the user saw.

In order to solve the technical problem, the utility model discloses a technical scheme does: the utility model provides a hexagon columnar structure for diffraction optical waveguide, is including the little projection ray apparatus that is used for sending image light, the waveguide base plate that is used for the transfer image light, the coupling grating and the coupling grating that are used for receiving and conduct little projection ray apparatus and send image light, coupling grating locates the light inlet department of waveguide base plate, coupling grating locates the light outlet department of waveguide base plate, coupling grating is provided with a plurality of regular hexagonal prism that are used for diffraction image light, a plurality of regular hexagonal prism arrange and form a plurality of partitions from the direction of coupling grating to coupling grating, and adjacent spacing distance between the partition reduces gradually and is axisymmetric distribution, the length of side and the high homoenergetic of regular hexagonal prism in the partition equal.

As the preferred scheme of the utility model, the image source model in the micro-projection ray apparatus is LCOS, DMD, OLED or MEMS.

As a preferable aspect of the present invention, the incoupling grating is a one-dimensional tilted grating or a one-dimensional blazed grating.

As the preferred scheme of the utility model, a plurality of regular hexagonal prism are 60 contained angle array and arrange.

As the preferred scheme of the utility model, the height of regular hexagonal prism is 20-200nm, and the length of side of the top surface and the bottom surface of regular hexagonal prism is 50nm-200 nm.

The beneficial effect of adopting above-mentioned technical scheme is: the utility model provides an outcoupling grating is through a plurality of regular hexagonal prism that are 60 contained angle array and arrange of design, the unequal interval subregion has been done to the coupling grating region, from the coupling grating to the direction of coupling grating, spacing distance between the adjacent subregion reduces gradually and is axisymmetric distribution for the image light who jets out from the coupling grating is even, fine solution the whole diffraction waveguide's of diffraction grating inefficiency and inhomogeneous, the projection image definition that the user saw is high problem inadequately.

Drawings

FIG. 1 is a schematic view of the light beam propagation of the present invention;

fig. 2 is a schematic diagram of two configurations of the inventive incoupling grating;

fig. 3 is a schematic view of the light beam propagation of the image light on the coupling grating according to the present invention;

fig. 4 is a schematic diagram of the arrangement of a plurality of regular hexagonal prisms on the coupling grating according to the present invention;

fig. 5 is a schematic view of the light beam propagation in practical application of the present invention.

In the figure, 1, a micro projection optical machine; 2. coupling in a grating; 3. a waveguide substrate; 4. coupling out the grating; 5. the human eye; 6. tilting the grating; 7. blazed grating; 8. coupling into a grating region; 9. and (4) coupling out the grating area zone.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

According to fig. 1, the embodiment provides a hexagonal columnar structure for a diffractive optical waveguide, which includes a micro-projector 1 for emitting image light, a waveguide substrate 3 for forming a diffraction grating, an incoupling grating 2 for receiving and conducting the image light emitted by the micro-projector 1, and an outcoupling grating 4, wherein the incoupling grating 2 is disposed at an incident opening of the waveguide substrate 3, the outcoupling grating 4 is disposed at an emergent opening of the waveguide substrate 3, and the outcoupling grating 4 is provided with a plurality of regular hexagonal prisms for diffracting the image light. Preferably, the regular hexagonal prisms are arranged in an included angle array of 60 degrees. The regular hexagonal prisms are arranged in the direction from the coupling-in grating 2 to the coupling-out grating 4 to form a plurality of partitions, the spacing distance between the adjacent partitions is gradually reduced and is in axisymmetric distribution, and the geometric parameters such as the side length, the height and the like of the regular hexagonal prisms in the partitions are equal. So that the image light emitted from the outcoupling grating 4 is uniform; the hexagonal columnar structure is used in the two-dimensional grating waveguide, the efficiency of each diffraction order can be better controlled, so that the high efficiency and the high uniformity of the whole diffraction waveguide can be better realized, and the two parameters are important for the performance of the augmented reality glasses.

The image source model in the micro-projector light machine 1 is LCOS, DMD, OLED or MEMS. The utility model discloses an optimal LCOS of image source model, LCOS have and utilize light efficiency height, small, aperture ratio height, make characteristics such as the technique is more ripe, realization high resolution that it can be very easy and abundant color expression.

As shown in fig. 2, the incoupling grating 2 may be, but is not limited to, a one-dimensional tilted grating 6 or a one-dimensional blazed grating 7.

The height of the regular hexagonal prism is 20-200nm, and the side lengths of the top surface and the bottom surface of the regular hexagonal prism are 50-200 nm. Preferably, the height of the regular hexagonal prism is 80nm, and the side lengths of the top surface and the bottom surface of the regular hexagonal prism are both 100 nm.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. The utility model provides a hexagon columnar structure for diffraction optical waveguide, its characterized in that, including the micro-projection ray apparatus that is used for sending image light, the waveguide base plate that is used for the transfer image light, be used for receiving and conduct the coupled grating that micro-projection ray apparatus sent image light and couple out the grating, the light entrance department of waveguide base plate is located to the coupled grating, the light exit department of waveguide base plate is located to the coupled grating, the coupled grating is provided with a plurality of regular hexagonal prism that are used for diffraction image light, a plurality of regular hexagonal prism arrange and form a plurality of partitions from the direction of coupled grating to coupled grating, and adjacent spacing distance between the partition reduces gradually and is axisymmetric distribution, the length of side and the height homoenergetic of the regular hexagonal prism in the partition equal.

2. The hexagonal columnar structure for a diffractive optical waveguide according to claim 1, wherein an image source model in the micro-projector is LCOS, DMD, OLED or MEMS.

3. The hexagonal columnar structure for a diffractive optical waveguide according to claim 1, wherein the incoupling grating is a one-dimensional tilted grating or a one-dimensional blazed grating.

4. The hexagonal columnar structure for a diffractive optical waveguide of claim 1, wherein the plurality of regular hexagonal prisms are arranged in an angled array of 60 °.

5. The hexagonal columnar structure for a diffractive optical waveguide according to claim 1, wherein the height of the regular hexagonal prism is 20 to 200nm, and the side lengths of the top surface and the bottom surface of the regular hexagonal prism are each 50 to 200 nm.