Method for realizing large view field by optical equipment and optical equipment

Abstract

The embodiment of the invention provides a method for realizing a large view field of optical equipment and the optical equipment. The optical equipment comprises a light guide device, a first projection light machine and a second projection light machine. The light guide device comprises a waveguide substrate and a coupling area arranged on the waveguide substrate. The method for realizing the large view field by the optical equipment comprises the following steps: acquiring a first angle, wherein the first angle is an included angle formed between the optical axis direction of a first projection light machine and the normal direction of a waveguide substrate; a second angle is obtained, the second angle is an included angle formed between the optical axis direction of the second projection light machine and the normal direction of the waveguide substrate, and the first projection light machine and the second projection light machine are located on the different sides of the normal direction of the waveguide substrate; controlling the first projection light machine and the second projection light machine to form a spliced picture in the coupling-in area; and determining a diagonal view field angle of the spliced picture according to the first angle, the second angle, the vertical view field angle of the first projection light machine and the vertical view field angle of the second projection light machine.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical imaging technology. More specifically, the embodiments of the present application relate to a method for an optical device to achieve a large field of view and an optical device. Background Art

[0002] Augmented reality (AR) technology cleverly blends virtual information with real-world scenes. Using a series of optical elements, it overlays virtual information onto real-world scenes and has garnered widespread attention in recent years. AR displays are key to implementing AR technology. AR displays are typically worn over the user's eyes, such as in the form of glasses or head-mounted displays. Through the AR display, the user can simultaneously observe the augmented content projected by the system and the actual real-world scenery.

[0003] The field of view of a typical AR diffractive waveguide device primarily depends on the light engine's field of view. The waveguide simply amplifies the image pixels displayed by the light engine but does not alter the field of view. The field of view (FOV) represents the size of the field of view produced by the display system and is a key metric for evaluating the optical properties of AR optical engines. It directly affects the field of view produced by the diffractive waveguide. Existing diffractive waveguides paired with single AR optical engines produce a relatively narrow field of view, limiting the field of view produced by the diffractive waveguide.

[0004] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Invention

[0005] The purpose of this application is to provide a method for an optical device to achieve a large field of view and a new technical solution for the optical device.

[0006] In a first aspect, the present application provides a method for achieving a large field of view in an optical device. The optical device includes a light guide device, a first projection light engine, and a second projection light engine. The light guide device includes a waveguide substrate and an incoupling region disposed on the waveguide substrate.

[0007] The method for achieving a large field of view of the optical device includes:

[0008] Acquire a first angle, wherein the first angle is an angle formed between an optical axis direction of the first optical projection machine and a normal direction of the waveguide substrate;

[0009] Acquire a second angle, wherein the second angle is an angle formed between an optical axis direction of the second optical projection engine and a normal direction of the waveguide substrate, and the first optical projection engine and the second optical projection engine are located on opposite sides of the normal direction of the waveguide substrate;

[0010] Controlling the first optical projector and the second optical projector to form a spliced ​​image in the coupling-in area;

[0011] The diagonal viewing angle of the spliced ​​image is determined according to the first angle, the second angle, the vertical viewing angle of the first projector, and the vertical viewing angle of the second projector.

[0012] Optionally, determining the diagonal viewing angle of the spliced ​​image according to the first angle, the second angle, the vertical viewing angle of the first projector, and the vertical viewing angle of the second projector specifically includes:

[0013] Determining a vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector, and the vertical field angle of the second projector;

[0014] Acquire the horizontal field angle of the spliced ​​image according to the horizontal field angle of the first projector and the horizontal field angle of the second projector;

[0015] The diagonal viewing angle of the spliced ​​picture is determined according to the vertical viewing angle of the spliced ​​picture and the vertical viewing angle of the spliced ​​picture.

[0016] Optionally, determining the vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector, and the vertical field angle of the second projector specifically includes:

[0017] When the vertical field angle of the first projector is equal to the vertical field angle of the second projector, the vertical field angle of the spliced ​​image β=α1+α2+F, where α1 is the first angle, α2 is the second angle, and F is the vertical field angle of the first projector and the vertical field angle of the second projector.

[0018] Optionally, determining the vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector, and the vertical field angle of the second projector specifically includes:

[0019] In the case where the vertical viewing angle of the first projector is not equal to the vertical viewing angle of the second projector, the vertical viewing angle of the spliced ​​image is Wherein α1 is the first angle, α2 is the second angle, F1 is the vertical field angle of the first projection light machine, and F2 is the vertical field angle of the second projection light machine.

[0020] Optionally, obtaining the horizontal field angle of the spliced ​​image based on the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine specifically includes: when the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine are not equal, the horizontal field angle of the spliced ​​image is the minimum value of the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine.

[0021] Optionally, obtaining the horizontal field angle of the spliced ​​image based on the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine specifically includes: when the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine are equal, the horizontal field angle of the spliced ​​image is equal to the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine.

[0022] Optionally, determining the diagonal field angle of the spliced ​​picture according to the vertical field angle of the spliced ​​picture and the horizontal field angle of the spliced ​​picture specifically includes: a relationship between the diagonal field angle of the spliced ​​picture, the horizontal field angle of the spliced ​​picture, and the vertical field angle of the spliced ​​picture is: Where DFOV is the diagonal field of view of the stitched image, HFOV is the horizontal field of view of the stitched image, and VFOV is the vertical field of view of the stitched image.

[0023] Optionally, the method for achieving a large field of view of an optical device further includes: adjusting the setting positions of the first projector and the second projector so that the first projector and the second projector form a splicing intersection, and the splicing intersection has a first distance from the coupling-in area.

[0024] Optionally, the first distance is determined according to the length of the coupling-in area and the vertical viewing angle of the spliced ​​image.

[0025] Optionally, the first angle and the second angle are equal.

[0026] In a second aspect, an embodiment of the present application further provides an optical device. The optical device includes a light guide device, a first projection light engine, and a second projection light engine, wherein the light guide device includes a waveguide substrate and an incoupling region disposed on the waveguide substrate;

[0027] The first optical projection machine is disposed at a first position, and a first angle is formed between an optical axis direction of the first optical projection machine and a normal direction of the waveguide substrate;

[0028] The second optical projection machine is disposed at a second position, and a second angle is formed between an optical axis direction of the second optical projection machine and a normal direction of the waveguide substrate.

[0029] According to an embodiment of the present application, a method for an optical device to achieve a large field of view is provided, wherein two projector light machines and a light guide device realize a splicing architecture, and the two projector light machines form a spliced ​​screen in the coupling-in area of ​​the light guide device. The diagonal field of view angle of the spliced ​​screen is determined by a first angle between the optical axis direction of the first projector light machine and the normal direction of the waveguide substrate, a second angle between the optical axis direction of the second projector light machine and the normal direction of the waveguide substrate, and a vertical field of view angle between the first projector light machine and the second projector light machine, so that the diagonal field of view angle of the spliced ​​screen is greater than the diagonal field of view angle of the first projector light machine and the diagonal field of view angle of the spliced ​​screen is greater than the diagonal field of view angle of the second projector light machine, thereby enabling the light guide device to produce a larger field of view, accommodate more information, and achieve a better product display effect.

[0030] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0032] Figure 1 Shown is a schematic diagram of the optical device structure provided in an embodiment of the present application.

[0033] Figure 2 The figure shows a schematic diagram of the field of view angle splicing of the first projection light machine and the second projection light machine provided in an embodiment of the present application.

[0034] Figure 3 Shown is a flow chart of a method for achieving a large field of view using an optical device according to an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 1. First projection optical engine; 2. Second projection optical engine; 3. Light guide device. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0039] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] The embodiment of the present application provides a method for an optical device to achieve a large field of view. Figure 1 , the method for optical equipment to achieve a large field of view is to realize a splicing architecture through two projection light machines and a light guide device 3. The two projection light machines form a spliced ​​picture in the coupling area of ​​the light guide device 3, which can obtain a larger field of view angle than a single light machine, so that the light guide device 3 has a larger field of view range, can accommodate more information, and achieve a better product display effect. The projection light machine is an AR light machine. The AR light machine can be a self-luminous active device (such as a Micro OLED light machine and a Micro LED light machine), or a liquid crystal display screen that requires external light source illumination (such as an L cos light machine), and a digital micromirror array based on MEMS technology (such as a DLP light machine) and an LBS light machine with laser beam scanning technology. The light guide device 3 can be a diffraction light waveguide. The optical device is an AR display device. The light guide device 3 may include a waveguide substrate and a coupling area arranged on the waveguide substrate.

[0043] In the method for achieving a large field of view using an optical device provided in an embodiment of the present application, a splicing architecture is achieved by using two optical projectors and a light guide device 3. The specifications of the two optical projectors can be different, for example, one optical projector is a monochrome optical projector and the other is a full-color optical projector. Alternatively, the specifications of the two optical projectors can be the same, for example, both optical projectors are monochrome optical projects or both optical projectors are full-color projects.

[0044] In the method for achieving a large field of view in an optical device provided in an embodiment of the present application, when two projectors are selected and spliced ​​with the light guide device 3, the horizontal field of view angle, vertical field of view angle, and diagonal field of view angle of each projector are determined. The horizontal field of view angles of the two projectors can be the same or different, the vertical field of view angles of the two projectors can be the same or different, and the diagonal field of view angles of the two projectors can be the same or different.

[0045] Specifically, refer to Figure 3 , the method for achieving a large field of view of the optical device includes:

[0046] S101: Acquire a first angle, wherein the first angle is the angle formed between the optical axis direction of the first optical projection engine 1 and the normal direction of the waveguide substrate;

[0047] S102: Acquire a second angle, wherein the second angle is the angle formed between the optical axis direction of the second optical projector 2 and the normal direction of the waveguide substrate, and the first optical projector 1 and the second optical projector 2 are located on opposite sides of the normal direction of the waveguide substrate;

[0048] S103: Control the first optical projector 1 and the second optical projector 2 to form a spliced ​​image in the coupling-in area;

[0049] S104 : Determine the diagonal viewing angle of the spliced ​​image according to the first angle, the second angle, the vertical viewing angle of the first projector 1 , and the vertical viewing angle of the second projector 2 .

[0050] In step S101, the first projector 1 is set at a first position. When the first projector 1 is at the first position, an angle is formed between the optical axis direction of the first projector 1 and the normal direction of the waveguide substrate. The angle is detected by an angle measuring instrument or other equipment to obtain a first angle.

[0051] The optical axis direction of the first optical projector 1 is: the direction in which the optical axis of the first optical projector 1 is located.

[0052] The normal direction of the waveguide substrate is the direction of the normal line of a surface of the waveguide substrate of the light guide device 3 .

[0053] When the first light projector 1 is located at the first position, the light emitted by the first light projector 1 can be transmitted to the coupling-in area of ​​the light guide device 3 .

[0054] In step S102, the second projector 2 is set at a second position. When the second projector 2 is at the second position, an angle is formed between the optical axis direction of the second projector 2 and the normal direction of the waveguide substrate. The angle is detected by an angle measuring instrument or other equipment to obtain the second angle.

[0055] The optical axis direction of the second optical projection machine 2 is: the direction where the optical axis of the second optical projection machine 2 is located.

[0056] The normal direction of the waveguide substrate is the direction of the normal to a surface of the waveguide substrate of the light guide device 3. The first optical projection engine 1 and the second optical projection engine 2 are arranged at an angle relative to the normal direction of the same surface of the waveguide substrate. When the first optical projection engine 1 and the second optical projection engine 2 are arranged at an angle relative to the normal direction of the same surface of the waveguide substrate, the angles of inclination of the two optical projection engines relative to the normal direction of the waveguide substrate can be the same or different, that is, the first angle and the second angle can be the same or different.

[0057] In step S103, with the first projector 1 at the first position and the second projector 2 at the second position, the first projector 1 is controlled to project its outgoing light onto the incoupling area, and the second projector 2 is controlled to project its outgoing light onto the incoupling area. When both the first projector 1 and the second projector 2 project their outgoing light onto the incoupling area, a spliced ​​image is formed in the incoupling area.

[0058] In step S104, when the first projector 1 and the second projector 2 both emit light and project it onto the coupling-in area, a spliced ​​image is formed in the coupling-in area of ​​the light guide device 3. The diagonal field angle of the spliced ​​image is determined based on the first angle, the second angle, the vertical field angle of the first projector 1, and the vertical field angle of the second projector 2, wherein the diagonal field angle of the spliced ​​image is greater than the diagonal field angle of the first projector 1, and the diagonal field angle of the spliced ​​image is greater than the diagonal field angle of the second projector 2.

[0059] Therefore, in an embodiment of the present application, a method for an optical device to achieve a large field of view is provided, wherein a splicing architecture is realized by two projector light machines and a light guide device 3, and the two projector light machines form a spliced ​​screen in the coupling area of ​​the light guide device 3. The diagonal field of view angle of the spliced ​​screen is determined by the first angle between the optical axis direction of the first projector light machine 1 and the normal direction of the waveguide substrate, the second angle between the optical axis direction of the second projector light machine 2 and the normal direction of the waveguide substrate, and the vertical field of view angle of the first projector light machine 1 and the second projector light machine 2, so that the diagonal field of view angle of the spliced ​​screen is greater than the diagonal field of view angle of the first projector light machine 1 and the diagonal field of view angle of the spliced ​​screen is greater than the diagonal field of view angle of the second projector light machine 2, thereby enabling the light guide device 3 to produce a larger field of view, accommodate more information, and achieve a better product display effect.

[0060] In a specific embodiment, referring to Figure 2 The first optical projector 1, the second optical projector 2 and the light guide device 3 form a splicing structure. The optical axis direction of the first optical projector 1 is tilted upward relative to the normal direction of the waveguide substrate. The angle formed between the optical axis direction of the first optical projector 1 and the normal direction of the waveguide substrate is a first angle α1, wherein the vertical field angle of the first optical projector 1 is F1, and the range of the vertical field angle is as follows: Figure 2Indicated by the black solid line.

[0061] The optical axis direction of the second optical projection machine 2 is tilted downward relative to the normal direction of the waveguide substrate. The angle formed between the optical axis direction of the first optical projection machine 1 and the normal direction of the waveguide substrate is a second angle α2, wherein the vertical field angle of the second optical projection machine 2 is F2, and the range of the vertical field angle is as follows: Figure 2 The first projection light machine 1 and the second projection light machine 2 form a spliced ​​image at the coupling region of the light guide device 3, as shown in FIG. Figure 2 The dotted line shows the size h of the spliced ​​image.

[0062] Reference Figure 2 , the vertical field angle of the spliced ​​image is β (the vertical field angle of the spliced ​​image is the opening angle of the spliced ​​image). According to the geometric relationship, the diagonal field angle of the spliced ​​image can be determined according to the first angle, the second angle, the vertical field angle F1 of the first projector light machine 1, and the vertical field angle F2 of the second projector light machine 2.

[0063] Determining the diagonal viewing angle of the spliced ​​image according to the first angle, the second angle, the vertical viewing angle of the first projector 1, and the vertical viewing angle of the second projector 2 specifically includes:

[0064] S1041: Determine the vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector 1, and the vertical field angle of the second projector 2;

[0065] S1042: Acquire the horizontal field angle of the spliced ​​image according to the horizontal field angle of the first projector 1 and the horizontal field angle of the second projector 2;

[0066] S1043: Determine a diagonal viewing angle of the spliced ​​picture according to the vertical viewing angle of the spliced ​​picture and the vertical viewing angle of the spliced ​​picture.

[0067] In step S1041, there are two methods for calculating the vertical field angle of the spliced ​​image. The first method is to calculate that the vertical field angle of the first projector 1 and the vertical field angle of the second projector 2 are equal, and the second method is to calculate that the vertical field angle of the first projector 1 and the vertical field angle of the second projector 2 are not equal.

[0068] When the vertical field angle of the first projector 1 and the vertical field angle of the second projector 2 are equal, determining the vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector 1, and the vertical field angle of the second projector 2 specifically includes:

[0069] The vertical viewing angle β of the spliced ​​image is α1+α2+F, where α1 is the first angle, α2 is the second angle, and F is the vertical viewing angle of the first projector 1 and the vertical viewing angle of the second projector 2 .

[0070] It can be seen that the vertical viewing angle β of the spliced ​​image is greater than the vertical viewing angle F of the first projector 1 , and the vertical viewing angle β of the spliced ​​image is greater than the vertical viewing angle F of the second projector 2 .

[0071] In addition, when the vertical field angle of the first projector 1 and the vertical field angle of the second projector 2 are not equal, the vertical field angle of the spliced ​​image is determined according to the first angle, the second angle, the vertical field angle of the first projector 1 and the vertical field angle of the second projector 2, specifically including: the vertical field angle of the spliced ​​image Wherein α1 is the first angle, α2 is the second angle, F1 is the vertical field angle of the first projector 1 , and F2 is the vertical field angle of the second projector 2 .

[0072] It can be seen that the vertical viewing angle β of the spliced ​​image is greater than the vertical viewing angle F of the first projector 1 , and the vertical viewing angle β of the spliced ​​image is greater than the vertical viewing angle F of the second projector 2 .

[0073] In step S1042, there are two ways to calculate the horizontal field of view angle of the spliced ​​image based on the horizontal field of view angle of the first projector 1 and the horizontal field of view angle of the second projector 2. The first method is to calculate the horizontal field of view angle of the first projector 1 and the horizontal field of view angle of the second projector 2 if they are equal, and the second method is to calculate the horizontal field of view angle of the first projector 1 and the horizontal field of view angle of the second projector 2 if they are not equal.

[0074] In one embodiment, when the horizontal field angle of the first projector 1 and the horizontal field angle of the second projector 2 are not equal, the horizontal field angle of the spliced ​​image is the minimum value of the horizontal field angle of the first projector 1 and the horizontal field angle of the second projector 2.

[0075] In addition, when the horizontal viewing angles of the first projector 1 and the second projector 2 are equal, the horizontal viewing angles of the spliced ​​image are equal to the horizontal viewing angles of the first projector 1 and the second projector 2.

[0076] In step S1043, determining the diagonal viewing angle of the stitched picture according to the vertical viewing angle of the stitched picture and the vertical viewing angle of the stitched picture specifically includes:

[0077] The relationship between the diagonal field of view DFOV, the horizontal field of view HFOV and the vertical field of view VFOV of the stitched image is:： The diagonal field of view DFOV of the stitched image can be calculated by obtaining the horizontal field of view HFOV and the vertical field of view VFOV of the stitched image.

[0078] According to calculations, the first angle between the optical axis direction of the first projector light machine 1 and the normal direction of the waveguide substrate, the second angle between the optical axis direction of the second projector light machine 2 and the normal direction of the waveguide substrate, and the diagonal field angle of the spliced ​​image can be determined according to the vertical field angles of the first projector light machine 1 and the second projector light machine 2, so that the diagonal field angle of the spliced ​​image is greater than the diagonal field angle of the first projector light machine 1 and the diagonal field angle of the spliced ​​image is greater than the diagonal field angle of the second projector light machine 2, ultimately allowing the light guide device 3 to produce a larger field of view, accommodate more information, and achieve a better product display effect.

[0079] In one embodiment, the method for achieving a large field of view of an optical device further includes: adjusting the setting positions of the first projector 1 and the second projector 2 so that the first projector 1 and the second projector 2 form a splicing intersection, and the splicing intersection has a first distance from the coupling-in area.

[0080] In this embodiment, adjusting the setting positions of the first projector 1 and the second projector 2 can also be understood as determining the placement positions of the two projectors and the setting distances between the two projectors and the light guide device 3 .

[0081] When adjusting the setting positions of the first projector 1 and the second projector 2, there are two ways to understand that the first projector 1 and the second projector 2 form a splicing intersection. The first way of understanding is that when the first projector 1 and the second projector 2 are spliced, the vertex of the housing of the first projector 1 and the vertex of the housing of the second projector 2 are in contact, and the contact position forms a splicing intersection.

[0082] The second way of understanding is: when the first projector light machine 1 and the second projector light machine 2 are spliced ​​together, the first projector light machine 1 and the second projector light machine 2 have no contact, the first projector light machine 1 is tilted relative to the normal direction of the waveguide substrate, and the second projector light machine 2 is tilted relative to the normal direction of the waveguide substrate, and the intersection of the line connecting the part of the housing of the first projector light machine 1 closest to the normal and the part of the housing of the second projector light machine 2 closest to the normal and the normal serves as the splicing intersection.

[0083] In this embodiment, there is a first distance between the splicing intersection and the coupling-in area, and the first distance is used to characterize the arrangement positions of the two projection light engines.

[0084] In one embodiment, the first distance is determined according to the length of the coupling-in area and the vertical viewing angle of the spliced ​​image.

[0085] In this embodiment, the first distance is calculated based on the length of the coupling region and the vertical field angle of the spliced ​​image. The length of the coupling region is equal to the size h of the spliced ​​image, that is, the spliced ​​image fills the coupling region of the light guide device 3. For example, if the coupling region is circular, the length of the coupling region is the diameter of the circle; if the coupling region is rectangular, the length of the coupling region is the length of the rectangle.

[0086] Reference Figure 2 According to the geometric relationship, the relationship between the first distance d, the length h of the coupling area, and the vertical viewing angle β of the spliced ​​image is:

[0087] In one embodiment, the first angle and the second angle are equal.

[0088] In this embodiment, the first angle and the second angle are equal, that is, the first projector 1 and the second projector 2 are symmetrically arranged relative to the normal direction of the waveguide substrate, which facilitates the calculation of the field of view angle of the spliced ​​image and the processing of the clamping tool (the clamping tool fixes the first projector 1 and the second projector 2).

[0089] In a preferred embodiment, the optical device includes a first projector light machine 1, a second projector light machine 2 and a light guide device 3, the horizontal field angle of the first projector light machine 1 is equal to the horizontal field angle of the second projector light machine 2, the vertical field angle of the first projector light machine 1 is equal to the vertical field angle of the second projector light machine 2, and the diagonal field angle of the first projector light machine 1 is equal to the diagonal field angle of the second projector light machine 2.

[0090] The first projection light machine 1 is tilted relative to the waveguide substrate, and a first angle is formed between the optical axis direction of the first projection light machine 1 and the normal direction of the waveguide substrate; the second projection light machine 2 is tilted relative to the waveguide substrate, and a second angle is formed between the optical axis direction of the first projection light machine 1 and the normal direction of the waveguide substrate. The first angle and the second angle are equal, that is, the first projection light machine 1 and the second projection light machine 2 are symmetrically arranged relative to the normal direction of the waveguide substrate.

[0091] When the vertical field angles of the first projector 1 and the second projector 2 are equal, the vertical field angle of the spliced ​​image is determined as β=α1+α2+F based on the first angle, the second angle, and the vertical field angles of the first projector 1 and the second projector 2, where α1 is the first angle, α2 is the second angle, and F is the vertical field angles of the first projector 1 and the second projector 2. When the horizontal field angles of the first projector 1 and the second projector 2 are equal, the horizontal field angle of the spliced ​​image is equal to the horizontal field angles of a single projector.

[0092] The diagonal field angle of the stitched image is determined according to the vertical field angle of the stitched image and the horizontal field angle of the stitched image. The diagonal field angle of the stitched image is:

[0093] In a specific embodiment, two projectors are selected, each with a known field of view. First projector 1 has a diagonal field of view (DFOV1) of 30°, a horizontal field of view (HFOV1) of 24°, and a vertical field of view (VFOV1) of 18°. Second projector 2 has a diagonal field of view (DFOV2) of 30°, a horizontal field of view (HFOV2) of 24°, and a vertical field of view (VFOV2) of 18°.

[0094] In order to facilitate parameter calculation and the processing of the clamping fixture, the two projection optical machines are placed symmetrically with respect to the normal direction of the waveguide base of the diffraction optical waveguide, that is, the first angle α1 and the second angle α2 are equal, that is, α1=α.

[0095] The light emitted by the first projector 1 is controlled to be projected onto the coupling region, and the light emitted by the second projector 2 is controlled to be projected onto the coupling region, so as to form a spliced ​​image in the coupling region, and the spliced ​​image fills the coupling region.

[0096] Based on the actual product specifications of the diffraction waveguide, the length of the coupling zone is 4 mm, and the size h of the spliced ​​image is the same as the length of the coupling zone.

[0097] Set the tilt angle α of the two projection light machines, through β = 2α + F and Calculate the vertical field angle of the spliced ​​image and the first distance d between the projection optical machine and the coupling area. The calculation results are shown in the following table.

[0098] The tilt angle α of the projection light machine Vertical field of view of the stitched image The first distance d Diagonal field of view of the spliced ​​image 3° 24° 9.41mm 33.46° 6° 30° 7.46mm 37.76° 9° 36° 6.16mm 42.44° 12° 42° 5.21mm 47.4° 15° 48° 4.49mm 52.52° 18° 54° 3.93mm 57.8°

[0099] It can be seen that the diagonal field of view of the spliced ​​image is greater than the diagonal field of view of a single optical machine, achieving the effect of a large field of view by splicing two optical machines.

[0100] The present application also provides an optical device. The optical device includes a light guide device 3, a first projection light engine 1, and a second projection light engine 2. The light guide device 3 includes a waveguide substrate and an incoupling region disposed on the waveguide substrate.

[0101] The first optical projection machine 1 is disposed at a first position, and a first angle is formed between an optical axis direction of the first optical projection machine 1 and a normal direction of the waveguide substrate;

[0102] The second optical projection machine 2 is disposed at a second position, and a second angle is formed between the optical axis direction of the second optical projection machine 2 and the normal direction of the waveguide substrate.

[0103] In an embodiment of the present application, an optical device is also provided, which includes a light guide device 3, a first projector light machine 1 and a second projector light machine 2. The light guide device 3, the first projector light machine 1 and the second projector light machine 2 are spliced ​​together to form a splicing structure, so that the optical device can achieve a large field of view effect.

[0104] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0105] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above examples may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for achieving a large field of view of an optical device, characterized in that: The optical device includes a light guide device, a first projection light engine and a second projection light engine, wherein the light guide device includes a waveguide substrate and a coupling-in region provided on the waveguide substrate; The method for achieving a large field of view of the optical device includes: Acquire a first angle, wherein the first angle is an angle formed between an optical axis direction of the first optical projection machine and a normal direction of the waveguide substrate; Acquire a second angle, wherein the second angle is an angle formed between an optical axis direction of the second optical projection engine and a normal direction of the waveguide substrate, and the first optical projection engine and the second optical projection engine are located on opposite sides of the normal direction of the waveguide substrate; Controlling the first light projector and the second light projector to form a spliced ​​image in the coupling-in area; The diagonal viewing angle of the spliced ​​image is determined according to the first angle, the second angle, the vertical viewing angle of the first projector, and the vertical viewing angle of the second projector.

2. The method for achieving a large field of view of an optical device according to claim 1, wherein: Determining the diagonal viewing angle of the spliced ​​image according to the first angle, the second angle, the vertical viewing angle of the first projector, and the vertical viewing angle of the second projector specifically includes: Determining a vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector, and the vertical field angle of the second projector; Acquire the horizontal field angle of the spliced ​​image according to the horizontal field angle of the first projector and the horizontal field angle of the second projector; The diagonal viewing angle of the spliced ​​picture is determined according to the vertical viewing angle of the spliced ​​picture and the vertical viewing angle of the spliced ​​picture.

3. The method for achieving a large field of view of an optical device according to claim 2, wherein: Determining the vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector, and the vertical field angle of the second projector specifically includes: When the vertical field angle of the first projector is equal to the vertical field angle of the second projector, the vertical field angle of the spliced ​​image β=α1+α2+F, where α1 is the first angle, α2 is the second angle, and F is the vertical field angle of the first projector and the vertical field angle of the second projector.

4. The method for achieving a large field of view of an optical device according to claim 2, wherein: Determining the vertical field angle of the spliced ​​image according to the first angle, the second angle, the vertical field angle of the first projector, and the vertical field angle of the second projector specifically includes: In the case where the vertical viewing angle of the first projector is not equal to the vertical viewing angle of the second projector, the vertical viewing angle of the spliced ​​image is Wherein α1 is the first angle, α2 is the second angle, F1 is the vertical field angle of the first projection light machine, and F2 is the vertical field angle of the second projection light machine.

5. The method for achieving a large field of view of an optical device according to claim 2, wherein: Obtaining the horizontal field angle of the spliced ​​image based on the horizontal field angle of the first projector and the horizontal field angle of the second projector specifically includes: when the horizontal field angle of the first projector and the horizontal field angle of the second projector are not equal, the horizontal field angle of the spliced ​​image is the minimum value of the horizontal field angle of the first projector and the horizontal field angle of the second projector.

6. The method for achieving a large field of view of an optical device according to claim 2, wherein: Obtaining the horizontal field angle of the spliced ​​image according to the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine specifically includes: when the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine are equal, the horizontal field angle of the spliced ​​image is equal to the horizontal field angle of the first projector light machine and the horizontal field angle of the second projector light machine.

7. The method for achieving a large field of view of an optical device according to claim 2, wherein: Determining the diagonal viewing angle of the spliced ​​picture according to the vertical viewing angle of the spliced ​​picture and the horizontal viewing angle of the spliced ​​picture specifically includes: the relationship between the diagonal viewing angle of the spliced ​​picture, the horizontal viewing angle of the spliced ​​picture and the vertical viewing angle of the spliced ​​picture is: Where DFOV is the diagonal field of view of the stitched image, HFOV is the horizontal field of view of the stitched image, and VFOV is the vertical field of view of the stitched image.

8. The method for achieving a large field of view of an optical device according to claim 1, wherein: The method for achieving a large field of view of an optical device further includes: adjusting the setting positions of the first projector and the second projector so that the first projector and the second projector form a splicing intersection, and a first distance exists between the splicing intersection and the coupling-in area.

9. The method for achieving a large field of view of an optical device according to claim 8, wherein: The first distance is determined according to the length of the coupling-in area and the vertical viewing angle of the spliced ​​image.

10. The method for achieving a large field of view of an optical device according to claim 1, wherein: The first angle and the second angle are equal.

11. An optical device, characterized in that: The optical device comprises a light guide device, a first projection light engine and a second projection light engine, wherein the light guide device comprises a waveguide substrate and an incoupling region arranged on the waveguide substrate; The first optical projection machine is disposed at a first position, and a first angle is formed between an optical axis direction of the first optical projection machine and a normal direction of the waveguide substrate; The second optical projection machine is disposed at a second position, and a second angle is formed between an optical axis direction of the second optical projection machine and a normal direction of the waveguide substrate.

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