CN115079416A

CN115079416A - Augmented reality glasses

Info

Publication number: CN115079416A
Application number: CN202210827910.1A
Authority: CN
Inventors: 廖仁伟
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2022-04-20
Filing date: 2022-07-14
Publication date: 2022-09-20
Anticipated expiration: 2042-07-14
Also published as: TW202343074A; TWI803293B; CN115079416B

Abstract

The invention discloses augmented reality glasses which are worn in front of two eyes of a user. The image source is used for emitting an image beam. The collimating structure is disposed on a transmission path of the image beam to convert the image beam into a collimated beam. The lens group is arranged on a transmission path of the collimated light beam. The collimated light beams are converged at the focus of the ocular lens by the lens group, converted into parallel light beams by the ocular lens and transmitted to the eyes of a user.

Description

Augmented reality glasses

Technical Field

The present invention relates to an optical device, and more particularly, to augmented reality glasses.

Background

With the progress of display technology, augmented reality (augmented reality) display technology has become popular, and is widely applied to aspects of people's life, such as entertainment, medical surgery, and the like. The augmented reality technology allows a user to see not only a virtual image generated by the image light but also an actual object, and the virtual image can interact with the actual object.

However, since the pupil of the eye has a certain size, and the distances and angles of different positions on the pupil relative to the object or image it is gazing on are different, the image cannot be faithfully imaged on the eye, further causing other visual problems, such as convergence accommodation conflict.

Disclosure of Invention

The invention provides augmented reality glasses, which faithfully present images of an image source and avoid the problems of image distortion, convergence regulation conflict (VAC) and the like.

According to an embodiment of the present invention, an augmented reality glasses is provided for wearing in front of two eyes of a user, and the augmented reality glasses includes an image source, a collimating structure, a lens set and an eyepiece. The image source is used for emitting an image light beam. The collimating structure is disposed on a transmission path of the image beam to convert the image beam into a collimated beam. The lens group is arranged on a transmission path of the collimated light beam. The collimated light beam is converged at an object focus of the ocular lens by the lens group, is converted into a parallel light beam by the ocular lens and is transmitted to at least one of the two eyes.

Wherein the lens group is a field lens.

Wherein, the focal length of the eyepiece is larger than that of the field lens.

Wherein, the clear aperture of the eyepiece is larger than that of the field lens.

The collimating structure comprises a light blocking layer and a plurality of light holes, wherein the light holes are arranged on the light blocking layer in an array form.

Wherein, the ratio of the height to the width of each light hole is more than 20.

The image source comprises a display panel, and the width of each light hole is smaller than the minimum width of each sub-pixel of the display panel.

The image source comprises a display panel, and the ratio of the height of each light hole to the minimum width of each sub-pixel of the display panel is greater than 20.

The image source comprises a display panel, and the minimum distance between every two adjacent light holes is smaller than the minimum width of each sub-pixel of the display panel.

Wherein the object focus of the eyepiece overlaps a focal plane of the lens group.

Based on the above, the augmented reality glasses provided by the embodiments of the present invention convert the image beam into the collimated beam by using the collimating structure, and then focus the collimated beam on the object focus of the eyepiece by using the field lens to generate the parallel light incident on the eye, thereby avoiding the situation that the image cannot be faithfully imaged on the eye due to the different distances and angles between the different positions on the eye pupil and the image source. Since the image can be faithfully transferred to the eyes, visual problems such as convergence accommodation conflict, which often occur in augmented reality glasses, are avoided.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram of augmented reality glasses according to an embodiment of the invention.

Fig. 2A and 2B are schematic diagrams of a collimating structure according to an embodiment of the invention.

Wherein, the reference numbers:

100 augmented reality glasses

101 image source

102 collimating Structure

103 lens group

104 ocular lens

BL light-blocking layer

CL collimated light beam

D1, D2, D3 Direction

EY eye

F1, F2 focal length

H1 height

IL image beam

P1 focal plane

PL parallel light Beam

TH light hole

W1 width

W2 distance

Detailed Description

Refer to fig. 1, 2A and 2B. FIG. 1 shows augmented reality glasses according to an embodiment of the invention. FIG. 2A is a plan view of an alignment structure according to an embodiment of the invention, and FIG. 2B is a cross-sectional view of the alignment structure along line AA' shown in FIG. 2A. Augmented reality glasses 100 include an image source 101, a collimating structure 102, a lens group 103, and an eyepiece 104.

The image source 101 is used for emitting an image beam IL, and can be implemented by a micro-display. The microdisplay can be, for example, a self-illuminated or non-self-illuminated display such as a micro-led panel, a liquid crystal display, a liquid crystal on silicon display, or the like.

The collimating structure 102 is disposed on a transmission path of the image beam IL to convert the image beam IL into a collimated beam CL. The collimating structure 102 comprises a light blocking layer BL disposed on a plane formed by the second direction D2 and the third direction D3. The light blocking layer BL is made of black light absorption material and is provided with a plurality of light holes TH, a retaining wall is arranged between every two adjacent light holes TH, and the light holes TH are arranged on the light blocking layer BL in an array form. The image beam IL from the image source 101 is formed into a collimated beam CL after passing through the collimating structure 102, and the collimated beam CL is a plane wave and travels in a direction parallel to the first direction D1. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other.

The lens assembly 103 includes at least one lens, and is disposed on a transmission path of the collimated light beam CL (fig. 1 only shows the lens assembly 103 as one lens for illustration, but the lens assembly 103 may include a plurality of lenses). In the present embodiment, the lens group 103 is a field lens (field lens) provided to expand a field of view. The image information of the image source 101 is Fourier-transformed (Fourier Transform) by the lens unit 103, and a Fourier Transform plane is formed on the focal plane P1 of the lens unit 103. Since the collimated light beam CL is a plane wave, it is transmitted through the lens group 103 and then converged to the focal plane P1 of the lens group 103.

Eyepiece 104 is positioned to perform an inverse fourier transform on collimated beam CL. The object focus of eyepiece 104 is set to overlap with focal plane P1 of lens group 103 so that collimated light beam CL converging to focal plane P1 is allowed to exit from the object focus of eyepiece 104. Therefore, the collimated light beam CL is converted into a parallel light beam PL after being transmitted through the eyepiece lens 104, and the parallel light beam PL is incident on the eye EY.

It should be noted that the augmented reality glasses 100 according to the embodiment of the present invention utilizes the above-mentioned fourier transform and inverse fourier transform processes to faithfully transmit the image information of the image source 101 to the eye EY. Since the light beam incident on the eye EY is the parallel light beam PL, the situation that the image cannot be faithfully imaged on the eye EY due to different distances and angles between different positions on the eye pupil and the image source 101 is avoided.

Referring also to fig. 1, in the present embodiment, focal length F2 of eyepiece 104 is also set to be greater than focal length F1 of lens group 103, and Clear aperture (Clear aperture) of eyepiece 104 is greater than that of lens group 103 to expand image beam IL into parallel beam PL, increasing the visible range, expanding Eye box (Eye box). Specifically, in the conventional augmented reality glasses, since the size of the transparent plate (for example, lens) is fixed, the field of view is smaller as the visible range is larger. The smaller the visible range, the larger the field of view. In contrast, in the augmented reality glasses 100 provided by the present invention, the field of view is optimized by the field lens, and the visible range is optimized by the beam expanding process. That is, the augmented reality glasses 100 provided by the present invention can optimize both the field of view and the visual range.

Referring to fig. 2A and 2B, in an embodiment of the invention, a ratio of the height H1 of the light-transmitting hole TH to the width W1 is greater than 20, so as to effectively block the image beam IL traveling in the direction D1 away from the first direction and retain the image beam IL traveling in the direction D1, such that the image beam IL (i.e., the collimated beam CL) after passing through the collimating structure 102 has high collimation.

In some embodiments of the present invention, the image source 101 is a display panel. Also, the width W1 of the light transmission hole TH of the collimating structure 102 is smaller than the minimum width of the sub-pixel of the display panel to ensure that the collimated light beam CL has high collimation degree. In some embodiments, the ratio of the height H1 of the light transmission hole TH to the minimum width of the sub-pixel of the display panel is greater than 20. In some embodiments, the minimum distance W2 between every two adjacent light holes TH is smaller than the minimum width of each sub-pixel of the display panel, so as to ensure that the light holes TH are closely arranged, and improve the light transmittance of the collimating structure 102.

In summary, the augmented reality glasses provided in the embodiments of the present invention utilize the collimating structure to convert the image beam into the collimated beam, and then utilize the field lens to focus the collimated beam on the object focus of the eyepiece, so as to generate the parallel light incident on the eye, thereby avoiding the situation that the image cannot be faithfully imaged on the eye due to different positions on the eye pupil and different distances and angles from the image source. Since the image can be faithfully transmitted to the eyes, visual problems such as convergence accommodation conflict, which often occur in augmented reality glasses, are avoided.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. Augmented reality glasses for wearing in front of both eyes of a user, the augmented reality glasses comprising:

an image source for emitting an image beam;

the collimation structure is arranged on the transmission path of the image light beam so as to convert the image light beam into a collimated light beam;

a lens group arranged on the transmission path of the collimated light beam; and

the collimating light beam is converged at the object focus of the eyepiece by the lens group, converted into parallel light beams by the eyepiece and transmitted to at least one of the two eyes.

2. The augmented reality glasses of claim 1 wherein the lens group is a field lens.

3. The augmented reality glasses of claim 2 wherein the focal length of the eyepiece is greater than the focal length of the field lens.

4. The augmented reality glasses of claim 2 wherein the clear aperture of the eyepiece is larger than the clear aperture of the field lens.

5. The augmented reality glasses of claim 1 wherein the collimating structure comprises a light blocking layer having a plurality of light holes, and the light holes are arranged in an array on the light blocking layer.

6. The augmented reality eyewear of claim 5 wherein the ratio of the height to the width of each light-transmissive aperture is greater than 20.

7. The augmented reality glasses of claim 5 wherein the image source comprises a display panel and the width of each light hole is less than the minimum width of each sub-pixel of the display panel.

8. The augmented reality glasses of claim 5 wherein the image source comprises a display panel and a ratio of a height of each light hole to a minimum width of each sub-pixel of the display panel is greater than 20.

9. The augmented reality glasses of claim 5 wherein the image source comprises a display panel and the minimum distance between two adjacent light holes is less than the minimum width of each sub-pixel of the display panel.

10. The augmented reality glasses of claim 1 wherein the object focus of the eyepiece overlaps the focal plane of the lens set.