CN108363206A - A kind of Waveguide display of wide viewing angle - Google Patents

Abstract

This application involves a kind of Waveguide displays of wide viewing angle, which is characterized in that multiple input coupler, multiple output couplers and optical waveguide；The multiple input coupler is identical with the quantity of multiple output couplers, and the multiple input coupler and the multiple output coupler are one group of input/output coupler two-by-two；The field angle of the corresponding image source of the multigroup input/output coupler is different.Wide viewing angle Waveguide display disclosed in the present application, pass through the setting of multigroup input/output coupler, the field angle of the corresponding image source of the multigroup input/output coupler is different, the output image convergence superposition of different visual angles constitutes total visual angle of human eye viewing image at output coupler, to realize the purpose for increasing field angle.

Description

A waveguide display with wide viewing angle

technical field

The present application relates to the field of display technology, in particular to a waveguide display with a wide viewing angle.

Background technique

Near-eye display means that the observer can watch the image or data superimposed in the real environment while viewing the real objects outside. Therefore, it is widely used in various fields, especially in the military and consumer fields.

At present, the existing near-eye display technologies include the coaxial side-view prism method, the arrayed semi-permeable film waveguide method, the free-form surface method, the geometric waveguide method, and the holographic grating waveguide method.

However, the coaxial side-viewing prism method has many disadvantages such as small field of view, low resolution, high thickness, and low light energy utilization rate; the array type semi-permeable film waveguide method has serious ghost images, even if it can be achieved through angle selectivity. However, the process of this method is complicated and the cost is extremely high; the disadvantage of the free-form surface method is that it is large in size, difficult to process, and difficult to solve the problem of dispersion; the geometric waveguide method is complex in design, difficult in processing, and the system is comparatively Bulky; the holographic grating waveguide method abandons the complex optical system and can effectively reduce the size and quality of the system, but the field of view is limited.

In view of the limited field of view of holographic grating waveguide display technology, there are currently angle multiplexing methods, waveguide layering methods, etc., but different methods have certain defects.

Contents of the invention

The present application provides a waveguide display with a wide viewing angle, which at least solves at least one problem existing in the prior art.

In order to solve the above problems, in the first aspect, an embodiment of the present application provides a waveguide display with a wide viewing angle, including: multiple input couplers, multiple output couplers, and an optical waveguide;

The number of the plurality of input couplers and the plurality of output couplers is the same, and the plurality of input couplers and the plurality of output couplers form a group of input and output couplers;

The image sources corresponding to multiple sets of input-output couplers have different viewing angles.

Further, the waveguide display further includes a microdisplay, and multiple sets of the input-output couplers are arranged in sequence, and the microdisplay is used to sequentially input image sources of different viewing angles of the same image into the corresponding input couplers .

Further, the multiple sets of images corresponding to the field angles of the input-output couplers are continuous.

Further, the optical waveguide includes a curved optical waveguide.

Further, the curved optical waveguide is any one of a free-form optical waveguide, a cylindrical optical waveguide, and a spherical optical waveguide.

Further, the input coupler is any one of ordinary diffractive optical elements, holographic optical elements, and curved optical elements, and the output coupler is any one of ordinary diffractive optical elements and holographic optical elements.

Further, there are at least three sets of input-output couplers.

Further, the positions of the microdisplay and the plurality of input couplers satisfy that the total reflection angles of the light entering the optical waveguide are the same.

Further, the number of the micro-displays is the same as the number of the input-output couplers.

In the waveguide display with a wide viewing angle disclosed in the embodiment of the present application, through the setting of multiple sets of input and output couplers, the angles of view of the image sources corresponding to multiple sets of input and output couplers are different, and the output images of different viewing angles at the output couplers Convergence and superposition constitute the total viewing angle of the human eye watching the image, so as to achieve the purpose of increasing the viewing angle.

Description of drawings

The features and advantages of the present application will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the application in any way. In the accompanying drawings:

FIG. 1 is a schematic structural diagram of a waveguide display according to Embodiment 1 of the present application;

FIG. 2 is a schematic diagram of light propagation in a waveguide display according to Embodiment 1 of the present application;

FIG. 3 is a schematic structural diagram of a waveguide display according to Embodiment 2 of the present application;

FIG. 4 is a schematic diagram of light propagation in a waveguide display according to Embodiment 2 of the present application;

FIG. 5 is a schematic diagram of light convergence in Embodiment 2 of the present application.

Detailed ways

In order to better understand the above-mentioned purpose, features and advantages of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the application, but the application can also be implemented in other ways different from those described here, therefore, the protection scope of the application is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

Embodiment one

Embodiment 1 of the present application discloses a waveguide display with a wide viewing angle, as shown in FIG.

The input coupler is any one of ordinary diffractive optical elements, holographic optical elements, and curved optical elements, and the output coupler is any one of ordinary diffractive optical elements and holographic optical elements. Of course, other optical elements that meet the embodiments of the present disclosure may also be used, which is not limited here.

Wherein, the number of the plurality of input couplers and the plurality of output couplers is the same, and the preferred number in this embodiment is 3; and the number of the plurality of input couplers and the plurality of output couplers is A set of input and output couplers. Specifically, the input coupler 201 and the output coupler 301 are a set of input-output couplers, hereinafter referred to as the first input-output coupler, and the input coupler 202 and the output coupler 302 are a set of input-output couplers, hereinafter referred to as the second The input-output coupler, the input coupler 203 and the output coupler 303 are a group of input-output couplers, which are referred to as the third input-output coupler hereinafter.

The first input-output coupler, the second input-output coupler and the third input-output coupler are arranged in sequence, that is, the positions of the input coupler and the output coupler are arranged in sequence correspondingly.

The waveguide display in the embodiment of the present disclosure further includes a microdisplay, preferably, the microdisplay is used to sequentially input image sources of different viewing angles of the same image into the corresponding input couplers. Preferably, the number of the micro-displays is the same as the number of the input-output couplers, that is, the number of input-output couplers in this embodiment is 3, and the number of the micro-displays is also corresponding to 3.

The image sources corresponding to multiple sets of input-output couplers have different viewing angles.

Specifically, the first input-output coupler corresponds to the first viewing angle of the image source A, the second input-output coupler corresponds to the second viewing angle of the image source A, and the third input-output coupler corresponds to the third viewing angle of the image source A. The angle of view, the first angle of view, the second angle of view, and the third angle of view are different.

Preferably, the images corresponding to the first viewing angle, the second viewing angle and the third viewing angle are continuous, that is, the first viewing angle is the initial 30-degree viewing angle of the image source A, and the second viewing angle Angle is the middle 30-degree viewing angle of image source A, and the third viewing angle is the last 30-degree viewing angle of image source A. In this way, the final image observed by human eyes is the 90-degree viewing angle of image source A.

Preferably, the positions of the micro-display and the plurality of input-output couplers satisfy that the total reflection angles of the light entering the optical waveguide are the same. To facilitate a better understanding of the embodiments of the present disclosure, FIG. 2 shows a schematic diagram of light propagation inside a waveguide display.

In the waveguide display disclosed in the embodiment of the present application, through the setting of multiple sets of input and output couplers, the angles of view of the image sources corresponding to the multiple sets of input and output couplers are all different, and the output images of different viewing angles at the output couplers are converged and superimposed It constitutes the total viewing angle for the human eye to watch the image, so as to achieve the purpose of increasing the viewing angle.

Embodiment two

This embodiment discloses a waveguide display with a wide viewing angle, as shown in FIG. The optical waveguide 101 is a curved optical waveguide.

Optionally, the curved optical waveguide is any one of a free-form optical waveguide, a cylindrical optical waveguide, and a spherical optical waveguide. Of course, other curved optical waveguides that can satisfy this embodiment are also possible, which is not limited here.

The specific structural location relationship is as in Embodiment 1, which will not be repeated here.

To better understand the embodiments of the present disclosure, FIG. 4 shows a schematic diagram of light propagation inside a waveguide display.

After the image source enters the optical waveguide through the input coupler, it is totally reflected in the optical waveguide, and then output through the output coupler. The images output from multiple viewing angles are superimposed to form the total field of view of the image viewed by the human eye, as shown in Figure 5.

In the waveguide display disclosed in the embodiment of the present application, through the setting of multiple sets of input and output couplers, the angles of view of the image sources corresponding to the multiple sets of input and output couplers are all different, and the output images of different viewing angles at the output couplers are converged and superimposed It constitutes the total viewing angle for the human eye to watch the image, so as to achieve the purpose of increasing the viewing angle.

In this application, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (9)

1. A waveguide display with a wide viewing angle, comprising: a plurality of input couplers, a plurality of output couplers, and optical waveguides; The number of the plurality of input couplers and the plurality of output couplers is the same, and the plurality of input couplers and the plurality of output couplers form a group of input and output couplers; The image sources corresponding to multiple sets of input-output couplers have different viewing angles. 2. The waveguide display according to claim 1, said waveguide display further comprising a micro-display, wherein a plurality of sets of said input-output couplers are arranged in sequence, and said micro-display is used to display different viewing angles of the same image. The image source of the field angle is sequentially input into the corresponding input coupler. 3 . The waveguide display according to claim 2 , wherein the images corresponding to the viewing angles of the multiple sets of input-output couplers are continuous. 4 . 4. The waveguide display of claim 1, wherein the optical waveguide comprises a curved optical waveguide. 5 . The waveguide display according to claim 4 , wherein the curved optical waveguide is any one of a free-form optical waveguide, a cylindrical optical waveguide, and a spherical optical waveguide. 6. The waveguide display according to claim 1, wherein the input coupler is any one of ordinary diffractive optical elements, holographic optical elements, and curved surface optical elements, and the output coupler is ordinary diffractive optical elements, holographic optical elements any type of component. 7. The waveguide display according to claim 1, wherein there are at least three sets of input and output couplers. 8 . The waveguide display according to claim 1 , wherein the positions of the microdisplay and the plurality of input couplers satisfy that the total reflection angles of light entering the optical waveguide are the same. 9. The waveguide display according to claim 2, wherein the number of the micro-displays is the same as the number of the input-output couplers.