Assembly method of light combination assembly, light combination assembly and head-mounted display device

Abstract

The invention provides an assembling method of a light combination assembly, which comprises the steps that an optical waveguide assembly and a plurality of displays are provided, the optical waveguide assembly comprises a waveguide, a coupling-out grating and a plurality of coupling-in gratings, the waveguide comprises a first surface and a second surface which are oppositely arranged, and the coupling-out grating and the coupling-in grating are arranged on the first surface at intervals; placing a first camera on one side, far away from the second surface, of the first surface, and placing a collimator on one side, far away from the first surface, of the second surface; adjusting the photosensitive surface of the first camera to be parallel to the first surface through the collimator; and sequentially adjusting the relative position relationship between the plurality of displays and the waveguide, so that images generated after the first camera detects the image light emitted by the plurality of displays coincide and the brightness uniformity of the images is greater than or equal to 35%. The invention also provides a light combination assembly and a head-mounted display device.

Description

Technical Field

[0001] The present application relates to an assembling method of a light combining component, a light combining component, and a head mounted display device including the light combining component. Background Art

[0002] Display devices that use augmented reality (AR) technology (AR display devices for short) combine virtual images with real scenes, allowing users to interact with digital content naturally. The display device includes a light-combining prism, which is used to combine multiple colors of light and then transmit them to the human eye to present a color image. However, the light-combining prism takes up a lot of space. Summary of the invention

[0003] Based on this, in order to reduce the volume of the display device, it is necessary to provide an assembly method of a light combining component to solve the above problems.

[0004] A first aspect of the present application provides a method for assembling a light combining assembly, comprising: Provide an optical waveguide assembly and a plurality of displays, wherein the optical waveguide assembly comprises a waveguide, an outcoupling grating and a plurality of incoupling gratings, wherein the waveguide comprises a first surface and a second surface arranged opposite to each other, and the outcoupling grating and the incoupling grating are arranged on the first surface at intervals; placing a first camera on a side of the first surface away from the second surface, and placing a collimator on a side of the second surface away from the first surface; Adjusting the photosensitive surface of the first camera to be parallel to the first surface by using the collimator; and The relative positional relationship between the multiple displays and the waveguide is adjusted in sequence so that the images generated after the first camera detects the image light emitted by the multiple displays overlap and the brightness uniformity of the images is greater than or equal to 35%.

[0005] The light combining assembly is manufactured by the above-mentioned light combining assembly method, so that the image light emitted by each display is directly coupled into the waveguide through the coupling grating, and then coupled out from the coupling grating after being combined and transmitted through the waveguide to be received by the user's eyes. Compared with the prior art that combines the image light emitted by multiple displays through a light combining prism and then transmits it to the waveguide, in the light combining assembly manufactured by the present application, the image light does not need to pass through the light combining prism before entering the waveguide, which is beneficial to reduce the loss of the image light during the transmission process. When the light combining assembly is applied to a head-mounted display device, it is beneficial to reduce the volume of the head-mounted display device and improve the light effect and brightness of the head-mounted display device when displaying images.

[0006] A second aspect of the present application provides a light combining component, comprising: a waveguide, a plurality of coupling-in gratings, a coupling-out grating, and a plurality of displays, wherein the waveguide comprises a first surface and a second surface spaced apart from each other, the coupling-out grating and the coupling-in grating are spaced apart and arranged on the first surface, and the plurality of displays are located on a side of the first surface away from the second surface; Each of the displays is used to emit image light, and each of the coupling-in gratings is located on an optical path of the image light; Each of the coupling-in gratings is used to couple the image light into the waveguide and transmit the image light in the waveguide toward the direction close to the coupling-out grating, and the coupling-out grating is used to couple the image light out of the waveguide; The light combining component satisfies the relationship: Wherein, λ is the wavelength of the image light, Λ is the grating period of the coupling-in grating, θ is the incident angle of the image light when it is incident on the coupling-in grating, n is the diffraction order, and φ is the diffraction angle.

[0007] The above-mentioned light combining assembly is manufactured by the above-mentioned light combining assembly method, and all the beneficial effects of the above-mentioned light combining assembly can be achieved.

[0008] A third aspect of the present application provides a head mounted display device, comprising: A frame having a mounting position; In the light combining assembly as described above, the waveguide is fixedly disposed in the installation position, and the multiple displays are embedded in the frame.

[0009] For the above-mentioned head-mounted display device, the above-mentioned light-combining component is integrated, and all the beneficial effects of the above-mentioned light-combining component can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the planar structure of the light combining component of an embodiment of the present application.

[0011] Figure 2 for Figure 1 Schematic diagram of the planar structure of the waveguide.

[0012] Figure 3 It is a schematic diagram of the process of assembling the light combining component according to the embodiment of the present application.

[0013] Figure 4 For execution Figure 3 Schematic diagram of the structure of the device and light-combining components during the mid-process.

[0014] Figure 5 Schematic diagram of the positional relationship between the light spot formed by the collimated light emitted by the collimator and the light spot formed by the reflected collimated light.

[0015] Figure 6 Schematic diagram of the positional relationship between the first projection image and the second projection image.

[0016] Figure 7 A schematic diagram of a first image displayed by a first camera.

[0017] Figure 8 This is a schematic diagram of the three-dimensional structure of a head-mounted display device according to an embodiment of the present application.

[0018] Main component symbols Head mounted display device: 1 Light combining components: 100 Waveguide: 10 First surface: 101 Second surface: 102 Incoupling grating: 20 Outcoupling grating: 30 Display: 40 Frame: 300 First camera: 2 Photosensitive surface: 21 Second camera: 3 First projected image: 31 First geometric center: 311 Second projected image: 32 Second geometric center: 322 Collimator: 4 Light spot: 41, 42 Collimated light: L1 Image light: L2 The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0020] It should be noted that when a component is referred to as being "fixed to" or "mounted on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. The term "and / or" used herein includes all and any combinations of one or more related listed items. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0021] In order to further explain the technical means and effects adopted by the present application to achieve the intended purpose, the present application is described in detail below in conjunction with the accompanying drawings and preferred implementation methods.

[0022] Please also read Figure 1 and Figure 2 The embodiment of the present application provides a light combining component 100, including a waveguide 10, a plurality of coupling-in gratings 20, a coupling-out grating 30 and a plurality of displays 40, wherein the plurality of displays 40 are arranged in a one-to-one correspondence with the plurality of coupling-in gratings 20. The material of the waveguide 10 may be glass or plastic. The waveguide 10 includes a first surface 101 and a second surface 102 spaced apart from each other, and the first surface 101 and the second surface 102 are parallel to each other. The coupling-out grating 30 and the coupling-in grating 20 are spaced apart from each other on the first surface 101, and the plurality of displays 40 are located on a side of the first surface 101 away from the second surface 102.

[0023] Each display 40 is used to emit image light L2, and each coupling grating 20 is located on the optical path of the image light L2. Each coupling grating 20 is used to couple the image light L2 into the waveguide 10. The image light L2 emitted by each display 40 is transmitted in the waveguide 10 toward the direction where the coupling grating 30 is located. The coupling grating 30 is used to couple the image light L2 out of the waveguide 10.

[0024] In some embodiments, the light combining component 100 includes three displays 40, each display 40 is used to emit a monochromatic image light, and the three displays 40 are respectively used to emit image lights of different colors. The three displays 40 can be used to emit red image light, blue image light, and green image light, for example. The present application does not limit the number of displays and the number of coupling gratings. The combined light of various monochromatic lights emitted from the coupling grating 30 can present a color image in the eye box.

[0025] In order to improve the image quality, it is expected that the various colors of light in the combined light emitted from the coupling grating 30 are evenly distributed, so that the color of the combined light is uniform on the one hand, and the brightness of the combined light is uniform on the other hand. In some existing schemes, a light-combining prism is arranged between the display and the optical waveguide component to combine the various colors of light, so that the color and brightness of the combined light emitted by the coupling grating 30 are uniform. In order to reduce the overall volume of the light-combining component 100, the present application omits the light-combining prism and realizes the light-combining function through the waveguide 10. In order to enable the waveguide 10 to also achieve a better light-combining effect and meet the requirements of uniform light-combining color and uniform brightness, the present application also provides an assembly method of the light-combining component 100, and through a precise assembly method, the geometric center of the projection contour of the display 40 on the first surface 101 in the assembled light-combining component 100 coincides with the geometric center of the projection contour of the corresponding coupling grating 20 on the first surface 101. When the light combining assembly 100 meets the above structural requirements, the assembly efficiency of the light combining assembly 100 can be improved, while also ensuring the brightness uniformity and chromaticity uniformity of the image formed by the combined light coupled out from the out-coupling grating 20.

[0026] In order to improve the coupling efficiency of the coupling grating 20 in the light combining component 100, the grating period of the coupling grating 20 can be designed according to the wavelength of the image light L2 emitted by the display 40 corresponding to the coupling grating 20, so that the wavelength of the image light L2 and the grating period of the coupling grating 20 satisfy the relationship: Wherein, λ is the wavelength of the image light L2, Λ is the grating period of the coupling-in grating 20, θ is the incident angle of the image light L2 when it is incident on the coupling-in grating 20, n is the diffraction order, and φ is the diffraction angle of the image light L2 when the diffraction order is n after the image light L2 is diffracted by the coupling-in grating 20.

[0027] By designing the grating periods of multiple coupling gratings 20, the relationship between the wavelength of the image light L2 emitted by each display 40 and the corresponding grating period of the coupling grating 20 satisfies the above formula, which is beneficial to improving the coupling efficiency of the coupling grating 20 in coupling the image light L2 into the waveguide 10.

[0028] Please also read Figure 3 and Figure 4 The assembly method of the light combining assembly 100 of the embodiment of the present application comprises the following steps: S1, provide an optical waveguide component and multiple displays 40, the optical waveguide component includes a waveguide 10, an outcoupling grating 30 and multiple incoupling gratings 20, the waveguide 20 includes a first surface 101 and a second surface 102 arranged opposite to each other, the outcoupling grating 101 and the incoupling grating 102 are arranged on the first surface 101 with an interval.

[0029] S2 , placing a first camera 2 on a side of the first surface 101 away from the second surface 102 , and placing a collimator 4 on a side of the second surface 102 away from the first surface 101 .

[0030] S3 , adjusting the photosensitive surface 21 of the first camera 2 to be parallel to the first surface 101 through the collimator 4 .

[0031] S4, sequentially adjusting the relative positional relationship between the multiple displays 40 and the waveguide 10 so that the brightness uniformity of the image generated after the first camera 2 detects the image light L2 emitted by the multiple displays 40 is greater than or equal to 35%.

[0032] In step S1 , an out-coupling grating 30 and a plurality of in-coupling gratings 20 are formed on a first surface of the waveguide 10 by etching or nano-imprinting technology.

[0033] The plurality of coupling-in gratings 20 are disposed on the first surface 101 at intervals. In other embodiments, the plurality of coupling-in gratings 20 are disposed on the first surface 101 in series.

[0034] In the provided optical waveguide assembly, each coupling-in grating 20 satisfies the relationship: Wherein, λ is the wavelength of the image light L2 emitted by the display 40, Λ is the grating period of the coupling-in grating 20, θ is the incident angle of the image light L2 when it is incident on the coupling-in grating 20, n is the diffraction order, and φ is the diffraction angle of the image light L2 when the diffraction order is n after the image light L2 is diffracted by the coupling-in grating 20.

[0035] When the coupling-in grating 20 is formed on the first surface 101 , the grating period of the coupling-in grating 20 is designed according to the wavelength of the image light L2 received by the coupling-in grating 20 , which is beneficial to improving the coupling-in efficiency of the coupling-in grating 20 .

[0036] In step S2 , in some embodiments, before the step of adjusting the photosensitive surface 21 of the first camera 2 to be parallel to the first surface by the collimator 4 , the step further includes: placing a plurality of displays 40 on a side of the first surface 101 away from the second surface 102 .

[0037] The first camera 2 is placed on the optical path of the collimated light L1 emitted by the collimator 4. When the light combining component 100 is applied to a display device for viewing displayed images by the user's eyes, the first camera 2 may be a human eye-simulating camera. When the light combining component 100 is applied to a device for mechanical alignment, the first camera 2 may be an industrial camera.

[0038] In step S3, the step of adjusting the photosensitive surface 21 of the first camera 2 to be parallel to the first surface 101 by the collimator 4 includes: S31, emitting collimated light L1 through the collimator 4, so that part of the collimated light L1 is received by the collimator 4 after being reflected by the second surface 102, and another part of the collimated light L1 is received by the first camera 2 after being coupled out of the coupling grating 30 through the waveguide 10; S32, adjusting the placement angle of the entire optical waveguide assembly so that the first surface 101 is perpendicular to the optical path of the collimated light L1; S33 , adjusting the first camera 2 so that the light-sensing surface 21 of the first camera 2 is parallel to the first surface 101 .

[0039] See also Figure 5 In step S31, the image formed by the projection of the collimated light L1 is in the shape of a cross. In other embodiments, the image formed by the projection of the collimated light L1 may be in other shapes, such as a cross or a checkerboard shape.

[0040] The collimator 4 includes a light source, a collimating lens and a data processing unit. The light source is used to emit light. The light needs to have good monochromaticity, which is conducive to reducing the influence of chromatic aberration on the shape of the light spot. And the divergence angle of the light needs to be less than 0.1 degrees to ensure that the light is approximately parallel and avoid the diffusion of the light spot. The collimating lens is used to convert the light into collimated light L1, and the data processing unit is used to receive the reflected collimated light L1 to determine whether the light spot formed by the emitted collimated light L1 coincides with the light spot formed by the reflected collimated light L1.

[0041] like Figure 5 As shown, the light spot 41 represents the light spot formed by the collimated light L1 emitted by the collimator 4 , and the light spot 42 represents the light spot formed by the collimated light L1 reflected back by the second surface 102 .

[0042] In step S32, by adjusting the overall placement angle of the optical waveguide component, the relative position between the second surface 102 and the collimator 4 is changed, so that the optical path of the collimated light L1 reflected back to the collimator 4 changes, and finally the position of the light spot 42 relative to the light spot 41 changes. When the light spot 42 coincides with the light spot 41, the first surface 101 is perpendicular to the optical path of the collimated light L1.

[0043] In step S33, the step of adjusting the first camera 2 includes: after the collimated light L1 passes through the waveguide 10 and is coupled out from the coupling grating 30, an image formed by the projection of the collimated light L1 is collected by the first camera 2; The first camera 2 is adjusted. When the center of the image captured by the first camera 2 is aligned with the calibration center of the first camera 2 and the lines of the image captured by the first camera 2 are uniform, the photosensitive surface 21 of the first camera 2 is parallel to the first surface 101 .

[0044] In step S4 , in some embodiments, after the step of adjusting the photosensitive surface 21 of the first camera 2 to be parallel to the first surface 101 by a collimator, the method further includes: placing a plurality of displays 40 on a side of the first surface 101 away from the second surface 102 .

[0045] The number of displays 40 is the same as the number of coupling-in gratings 20 .

[0046] Please also read Figure 4 and Figure 6 , before the step of sequentially adjusting the relative position relationship between the plurality of displays 40 and the waveguide 10, further comprising: S41, placing a second camera 3 on a side of the second surface 102 away from the first surface 101; S42, collecting images of a plurality of displays 40 and a plurality of coupling-in gratings 20 by means of a second camera 3, wherein the plurality of displays 40 correspond one to one to the coupling-in gratings 20; S43, adjusting the angles and / or positions of the multiple displays 40 until the geometric center of the outline of each display 40 in the image coincides with the geometric center of the outline of a corresponding coupling grating 20.

[0047] In step S41, the second camera 3 is a visual camera. A visual camera is a device that combines image acquisition with computer vision algorithms and can understand features such as objects, positions, and motions in a scene through image analysis.

[0048] In step S42, if Figure 6 As shown, the first projected image 31 represents an image of the coupling grating 20, and the second projected image 32 represents an image of the display 40. The first geometric center 311 represents the geometric center of the contour of the coupling grating 20, and the second geometric center 322 represents the geometric center of the contour of the display 40.

[0049] After the second camera 3 captures the first projection image 31 and the second projection image 32 , the second camera 3 analyzes the first projection image 31 and the second projection image 32 respectively to determine the first geometric center 311 and the second geometric center 322 .

[0050] In step S43 , after the first geometric center 311 and the second geometric center 322 are determined by the second camera 3 , the angle and / or position of the display 40 corresponding to the second geometric center 322 is adjusted so that the first geometric center 311 coincides with the second geometric center 322 .

[0051] In step S4, the step of sequentially adjusting the relative position relationship between the plurality of displays 40 and the waveguide 10 includes: Controlling the plurality of displays 40 to sequentially emit image light L2, and sequentially collecting the image light L2 emitted by each display 40 through the first camera 2 to sequentially generate a plurality of monochrome images; The angles and / or positions of the plurality of displays 40 are adjusted in sequence so that the brightness uniformity of each monochrome image is greater than or equal to 35%.

[0052] Among them, Figure 7 As shown, a monochrome image is an image including a plurality of "cross" shaped patterns. By observing the change in the brightness uniformity of the plurality of "cross" shaped patterns, the change in the brightness uniformity of the monochrome image can be determined. In other embodiments, the pattern in the monochrome image may include patterns of other shapes, such as a "rice" shape or a checkerboard shape.

[0053] The step of sequentially adjusting the angles and / or positions of the multiple displays 40 includes sequentially adjusting the tilt angles of the multiple displays 40 relative to the first surface 101, observing the changes of the monochrome image through the first camera 2, and optimizing the brightness uniformity of the monochrome image.

[0054] After the step of sequentially adjusting the angles and / or positions of the plurality of displays 40, the method further includes: Controlling two or more displays 40 to simultaneously emit image light L2, and simultaneously collecting the image light L2 emitted by the two or more displays 40 through the first camera 2 to sequentially generate a plurality of multi-color images; The angles and / or positions of two or more displays 40 are adjusted so that the brightness uniformity of each multi-color image is greater than or equal to 35%.

[0055] Each multi-color image is an image formed by superimposing two or more monochromatic images.

[0056] The step of adjusting two or more displays 40 includes: moving the positions of the two or more displays 40 in sequence in a direction parallel to the first surface 101, observing the changes of the multi-color image through the first camera 3, making two or more monochrome images in the multi-color image overlap, and making the brightness uniformity of the second image optimal.

[0057] After the step of sequentially adjusting the relative positional relationship between the plurality of displays 40 and the waveguide 10 , the method further includes: filling adhesive between the plurality of displays 40 and the plurality of coupling gratings 20 to fix the plurality of displays 40 and the optical waveguide assembly.

[0058] The distance between each display 40 and the coupling grating 20 is very small, so that adhesive can be filled between the display 40 and the coupling grating 20 to fix the display 40 and the optical waveguide component to prevent the relative position relationship between the display 40 and the optical waveguide component from changing.

[0059] The light combining component 100 is manufactured by the above-mentioned light combining component assembly method, so that the image light L2 emitted by each display 40 is directly coupled into the waveguide 10 through the coupling grating 20, and then coupled out from the coupling grating 40 after being combined and transmitted through the waveguide 10 to be received by the user's human eyes. Compared with the prior art that combines the image light L2 emitted by multiple displays 40 through a light combining prism and then transmits it into the waveguide 10, the assembly method of the light combining component 100 of the embodiment of the present application optically aligns the display 40 with the coupling grating 20 through a collimator, a first camera, and a second camera, so that the image light L2 emitted by multiple displays 40 is directly combined in the waveguide 10 and then coupled into the waveguide 10, which can effectively avoid processing and process errors caused by optically aligning the display 40 with the light combining prism and then combining the image light L2 emitted by multiple displays 40. The embodiment of the present application abandons the light combining prism and adopts the waveguide 10 for light combining, which has a small size and low cost, increases the diversity of the light combining device in the projection display module, and especially increases the selectivity of the light combining component 100 for certain environments that have special requirements on shape and volume and make the light combining prism unsuitable.

[0060] Furthermore, in the light combining component 100 produced in the embodiment of the present application, the image light L2 does not need to pass through the light combining prism before entering the waveguide 10, which is beneficial to reducing the loss of the image light L2 during the transmission process. When the light combining component 100 is applied to a head-mounted display device, it is beneficial to reduce the volume of the head-mounted display device and improve the light effect and brightness of the head-mounted display device when displaying images.

[0061] See also Figure 8 The embodiment of the present application also provides a head-mounted display device 1, including a frame 300 and a light combining component. The frame 300 is provided with a mounting position, in which the waveguide 10 is fixedly arranged in the mounting position, and a plurality of displays 40 are embedded in the frame 300. The image light L2 emitted by each display 40 directly enters the waveguide 10, and is transmitted to the human eye after light combining in the waveguide 10, which is beneficial to reduce the loss of the image light L2 caused during the transmission process, and reduces the volume of the head-mounted display device 1, which is beneficial to miniaturization and lightness of the head-mounted display device 1.

[0062] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A method for assembling a light combining component, characterized in that: include: Provide an optical waveguide assembly and a plurality of displays, wherein the optical waveguide assembly comprises a waveguide, an outcoupling grating and a plurality of incoupling gratings, wherein the waveguide comprises a first surface and a second surface arranged opposite to each other, and the outcoupling grating and the incoupling grating are arranged on the first surface at intervals; placing a first camera on a side of the first surface away from the second surface, and placing a collimator on a side of the second surface away from the first surface; Adjusting the photosensitive surface of the first camera to be parallel to the first surface by using the collimator; as well as The relative position relationship between the multiple displays and the waveguide is adjusted so that the images generated after the first camera detects the image light emitted by the multiple displays overlap and the brightness uniformity of the images is greater than or equal to 35%.

2. The method for assembling a light combining assembly according to claim 1, wherein: The step of adjusting the photosensitive surface of the first camera to be parallel to the first surface by the collimator comprises: Emits collimated light through the collimator, so that part of the collimated light is received by the collimator after being reflected by the second surface, and another part of the collimated light passes through the waveguide and is coupled out from the outcoupling grating and is received by the first camera; Adjusting the placement angle of the entire optical waveguide assembly so that the first surface of the waveguide is perpendicular to the optical path of the collimated light; The first camera is adjusted so that the light-sensitive surface of the first camera is parallel to the first surface.

3. The method for assembling a light combining assembly according to claim 1, wherein: Before the step of adjusting the photosensitive surface of the first camera to be parallel to the first surface by the collimator, the method further includes: The plurality of displays are placed on a side of the first surface away from the second surface.

4. The method for assembling a light combining assembly according to claim 1, wherein: After the step of adjusting the photosensitive surface of the first camera to be parallel to the first surface by the collimator, the method further includes: The plurality of displays are placed on a side of the first surface away from the second surface.

5. The method for assembling a light combining assembly according to claim 3 or 4, characterized in that: Before the step of sequentially adjusting the relative positional relationship between the plurality of displays and the waveguide, the method further includes: placing a second camera on a side of the second surface away from the first surface; Acquiring images of the plurality of displays and the plurality of coupling-in gratings by the second camera, wherein the plurality of displays correspond to the plurality of coupling-in gratings one by one; The angles and / or positions of the multiple displays are adjusted until the geometric center of the outline of each of the displays in the image coincides with the geometric center of the outline of the corresponding one of the coupling-in gratings.

6. The method for assembling a light combining assembly according to claim 1, wherein: The step of adjusting the relative position relationship between the plurality of displays and the waveguide comprises: Controlling the multiple displays to emit image light in sequence, and sequentially collecting the image light emitted by each of the displays through the first camera to sequentially generate multiple monochrome images; The angles and / or positions of the multiple displays are adjusted in sequence so that the brightness uniformity of each of the monochrome images is greater than or equal to 35%.

7. The method for assembling a light combining assembly according to claim 6, wherein: After the step of sequentially adjusting the angles and / or positions of the plurality of displays, the step further includes: Controlling the two or more displays to emit image light simultaneously, and collecting the image light emitted by the two or more displays simultaneously through the first camera to sequentially generate a plurality of multi-color images; The angles and / or positions of two or more of the multiple displays are adjusted so that the brightness uniformity of each of the multi-color images is greater than or equal to 35%.

8. The method for assembling a light combining assembly according to claim 1, wherein: After the step of adjusting the relative positional relationship between the plurality of displays and the waveguide, the step further includes: Adhesive is filled between the plurality of displays and the plurality of coupling gratings to fixedly connect the plurality of displays and the optical waveguide component.

9. A light combining component, characterized in that: include: A waveguide, a plurality of in-coupling gratings, an out-coupling grating and a plurality of displays, wherein the waveguide comprises a first surface and a second surface spaced apart from each other, the out-coupling grating and the in-coupling grating are spaced apart and arranged on the first surface, and the plurality of displays are located on a side of the first surface away from the second surface; Each of the displays is used to emit image light, and each of the coupling-in gratings is located on an optical path of the image light; Each of the coupling-in gratings is used to couple the image light into the waveguide and transmit the image light in the waveguide toward the direction close to the coupling-out grating, and the coupling-out grating is used to couple the image light out of the waveguide; The light combining component satisfies the relationship: Wherein, λ is the wavelength of the image light, Λ is the grating period of the coupling-in grating, θ is the incident angle of the image light when it is incident on the coupling-in grating, n is the diffraction order, and φ is the diffraction angle of the image light when the diffraction order is n after the image light is diffracted by the coupling-in grating.

10. A head mounted display device, characterized in that: include: A frame having a mounting position; According to the light combining assembly as described in claim 9, the waveguide is fixedly disposed in the mounting position, and the plurality of displays are embedded in the frame.

Images