WO2022022240A1

WO2022022240A1 - Projection module and assembly method therefor, and near-eye display apparatus comprising projection module

Info

Publication number: WO2022022240A1
Application number: PCT/CN2021/104694
Authority: WO
Inventors: 卢超; 李泓; 杜佳玮
Original assignee: 宁波舜宇光电信息有限公司
Priority date: 2020-07-28
Filing date: 2021-07-06
Publication date: 2022-02-03
Also published as: CN114002898A; CN116157735A

Abstract

The present invention relates to a projection module and an assembly method therefor, and a near-eye display apparatus comprising the projection module. The projection module of the present invention comprises a projection display device and a projection lens, wherein the projection display device comprises a lighting assembly, and a display module which has a display chip; and the projection display device further comprises a rigid structural member, on which a light conversion element of the lighting assembly is fixedly mounted, with a gap being provided between the display module and the rigid structural member. The projection module of the present invention has a good optical axis consistency, and a projected image is not prone to distortion and is of good quality.

Description

Projection module and assembly method thereof, and near-eye display device including projection module

technical field

The invention belongs to the technical field of projection display, and in particular relates to a projection module, a method for assembling the projection module, and a near-eye display device including the projection module.

Background technique

Near-eye display devices have received more and more attention, and near-eye display devices can choose to use virtual reality (Virtual Reality, VR) technology and augmented reality (Augmented Reality, AR) technology to project imaging. Compared with VR, AR can build a virtual scene based on the realization of the physical environment, bringing users a new experience.

AR technology can use a waveguide sheet scheme (that is, using a light source, a projection lens and a waveguide sheet), or a traditional Birdbath scheme. The traditional Birdbath solution is difficult to be tolerated by consumers due to its large size, difficult to further improve the field of view, and relatively poor experience. Near-eye display devices have become smaller and more beautiful, and the user experience is also better. Therefore, near-eye display devices using the waveguide sheet scheme are increasingly accepted by users.

Near-eye display devices using the waveguide sheet solution mainly include projection modules (eg, opto-mechanical) and waveguide sheets. The projection module projects the image into the waveguide sheet, and the image is dilated in two dimensions through the waveguide sheet, and then enters the human eye.

SUMMARY OF THE INVENTION

According to a first aspect of the present invention, a projection module is provided, which includes a projection display device and a projection lens, the projection display device includes a lighting assembly and a display module with a display chip; it also includes a rigid structural member, the The light converting element of the lighting assembly is fixedly mounted on the rigid structural member, and there is a gap between the display module and the rigid structural member.

According to some additional or alternative embodiments, a connection medium is provided in the gap, and the connection medium fixes the display module on the rigid structural member.

According to some additional or alternative embodiments, a first window is opened on one side of the rigid structural member, the display module is fixed at the window corresponding to the first window, and the display module and the The light converting elements are respectively located on both sides of the first opening window.

According to some additional or alternative embodiments, the gap is in the range of 0.05 mm or more and 1 mm or less, or further in the range of 0.1 mm or more and 0.6 mm or less.

According to some additional or alternative embodiments, the gap is configured to determine the positioning of the display chip relative to the lighting assembly, so that the image projection image output by the projection lens meets a predetermined requirement under the determined positioning.

According to some additional or alternative embodiments, the projection image complies with the predetermined requirement comprises: the imaging sharpness of the projection image complies with the corresponding predetermined requirement, the luminance uniformity of the projection image complies with the corresponding predetermined requirement, and the projection image The virtual image conforms to corresponding predetermined requirements; or further includes: the projected image can enter the human eye in a substantially horizontal or substantially vertical orientation.

According to some additional or alternative embodiments, the display module is fixed on the rigid structural member by a cured connecting medium in the gap, so that the display chip is fixed on the projection mold based on the determined positioning in the group.

According to some additional or alternative embodiments, the lighting assembly includes a light source module;

Wherein, the light diverting element is used to at least partially turn the light emitted by the light source module to the display chip, and/or at least partially turn the light returned from the display chip to the projection of the projection module lens.

According to some additional or alternative embodiments, the first fenestration is configured to enable the display module to be positioned and mounted at the fenestration corresponding to the first fenestration from the outside of the rigid structural member.

According to some additional or alternative embodiments, the display module includes a substrate for attaching the display chip;

Wherein, between the edge portion of the substrate and the step corresponding to the first opening for supporting and positioning the substrate, a connection medium for fixing the display module on the rigid structural member is provided.

According to some additional or alternative embodiments, the thickness of the connecting medium is in the range of 0.05 mm or more and 1 mm or less, or further in the range of 0.1 mm or more and 0.6 mm or less.

According to some additional or alternative embodiments, the connecting medium is configured to seal the gap.

According to some additional or alternative embodiments, the connecting medium has a thickness arrangement of non-uniform thickness such that the display module is positioned obliquely with respect to the rigid structure.

According to some additional or alternative embodiments, the projection module further includes a support plate;

Wherein, the support plate is provided with a drawing glue groove and a limit structure, the drawing glue groove is provided with a connecting medium for fixing and installing the rigid structural member, and the limiting structure is set corresponding to the rigid structural member and used The rigid structure is limitedly mounted on the support plate.

According to some additional or alternative embodiments, the outer wall of the rigid structural member is further provided with a second window facing the light source module and a third window facing the projection lens;

Wherein, the projection lens is positioned and installed on the third opening, so that the projection lens is positioned and installed relative to the projection display device.

According to some additional or alternative embodiments, the projection lens may be positioned and mounted on the On the third window.

According to a second aspect of the present invention, there is provided a near-eye display device, comprising: a waveguide sheet, any one of the projection modules described above, and a bracket;

Wherein, the waveguide sheet and the projection module are positioned and installed on the bracket so that the center of the light projected by the projection module falls at the center of the coupling region of the waveguide sheet.

According to some additional or alternative embodiments, the support is provided with a receiving structure for at least partially receiving the waveguide sheet;

Wherein, under the condition that the positioning of the waveguide sheet relative to the bracket is adjusted, the waveguide sheet is positioned and installed on the bracket through the connection medium in the receiving structure, so that the projection module is projected onto the bracket. The center of the ray falls on the center of the coupling region of the waveguide sheet.

According to some additional or alternative embodiments, the connection medium is arranged on both sides corresponding to the glue area of the waveguide sheet and is located between the waveguide sheet and the inner wall of the receiving structure; or the connection medium is opposite to the waveguide. The glue area of the sheet is unilaterally arranged and located between the waveguide sheet and the inner wall of the receiving structure.

According to some additional or alternative embodiments, the inner wall of the receiving structure is provided with protrusions for increasing the surface area of the connecting medium in contact with the inner wall.

According to some additional or alternative embodiments, a glue overflow groove is provided on the inner wall of the receiving structure.

According to some additional or alternative embodiments, the one-sided gap between the waveguide sheet and the inner wall of the receiving structure is in the range of greater than or equal to 0.25 mm and less than or equal to 1 mm.

According to some additional or alternative embodiments, a plurality of glue injection holes are provided in the bracket corresponding to the receiving structure and the glue drawing area of the waveguide sheet.

According to some additional or alternative embodiments, the projection module is located substantially on the out-coupling side of the waveguide sheet, or the projection module is located substantially on the opposite side of the out-coupling side of the waveguide sheet.

According to some additional or alternative embodiments, the projection module is positioned and mounted on the bracket substantially vertically aligned with the coupling region of the waveguide sheet.

According to some additional or alternative embodiments, the projection module is positioned and mounted on the bracket substantially parallel to the coupling-in region of the waveguide sheet, and is disposed between the projection module and the coupling-in region of the waveguide sheet There is a refracting prism, the refracting prism is positioned and installed relative to the bracket so that the center of the light projected by the projection module falls at the center of the coupling-in area of the waveguide sheet after being refracted by the prism.

According to some additional or alternative embodiments, the bracket is provided with an escape opening for avoiding the light projected by the projection module at a position corresponding to the coupling-in area of the waveguide sheet.

According to some additional or alternative embodiments, the support includes a main support and a sub support, wherein the main support and the sub support are removably fixedly connected together and form a receiving structure for at least partially receiving the waveguide sheet, The waveguide sheet is positioned and installed in the receiving structure between the main support and the auxiliary support, and the projection module is positioned and installed on the left and right sides of the main support.

According to some additional or alternative embodiments, the sub-support is fixedly disposed relative to the main support in a positioning manner that avoids the coupling-in area of the waveguide sheet.

According to some additional or alternative embodiments, marking points are provided on the support, which are used to directly position and install the waveguide sheet relative to the support through machine vision technology.

According to a third aspect of the present invention, a method for assembling a projection module is provided, comprising the steps of:

Assembling the lighting assembly of the projection module, wherein the light converting element of the lighting assembly is fixedly mounted on the rigid structural member;

disposing the display module with the display chip at the preset position of the projection module, so that an initial gap is left between the display module and the rigid structural member;

On the basis of the preset position, the positioning of the display module relative to the lighting assembly is adjusted until the projected image output by the projection lens of the projection module meets the predetermined requirements, and accordingly, the initial gap is adjusted Determined as the adjusted gap; and

The display module is fixed relative to the lighting assembly in the adjusted position.

According to some additional or alternative embodiments, in the adjustment step, the positioning of the display chip relative to the assembled lighting assembly is calibrated in an active manner, or the display chip is adjusted relative to the assembled lighting assembly using machine vision technology. Positioning of assembled lighting assemblies.

According to some additional or alternative embodiments, the projection image complies with the predetermined requirement comprises: the imaging sharpness of the projection image complies with the corresponding predetermined requirement, the luminance uniformity of the projection image complies with the corresponding predetermined requirement, and the projection image The virtual image distance meets the corresponding predetermined requirements; or further includes: the projected image can enter the human eye in a substantially horizontal or substantially vertical orientation.

According to some additional or alternative embodiments, the step of assembling the lighting assembly of the projection module includes:

Fixing and installing the light converting element and the light source module of the lighting assembly inside the first rigid structural member and the second rigid structural member respectively; and

The first rigid structure member and the second rigid structure member are fixedly mounted on the support plate.

According to some additional or alternative embodiments, the step of assembling the lighting assembly of the projection module further includes:

Before the first rigid structure member and the second rigid structure member are fixedly mounted on the support plate, the first rigid structure member and the second rigid structure member are positioned and connected to each other by means of snap connection.

According to some additional or alternative embodiments, the preset position is located outside the rigid structural member on which the light converting element is fixedly mounted;

In the adjusting step, the positioning of the display module with the display chip relative to the rigid structural member is adjusted from the outside of the rigid structural member, so as to adjust the position of the display chip relative to the lighting assembly. position.

According to some additional or alternative embodiments, the tuning includes one or more of the following:

Adjust the inclination angle of the display module relative to the rigid structural member, until the imaging clarity of the projection image output by the projection lens of the projection module meets the corresponding predetermined requirements;

The display module is translated relative to the rigid structural member in an xoy plane, until the brightness uniformity of the projected image meets the corresponding predetermined requirements, wherein the xoy plane is based on perpendicular to the light diverting element from the lighting assembly the direction of the light directed towards the display chip;

Translate the display module relative to the rigid structural member along the z direction until the virtual image distance of the projected image meets the corresponding predetermined requirement, wherein the z direction is directed from the light converting element of the lighting assembly to the display The direction of the light from the chip;

The display module is rotated relative to the rigid structure on the xoy plane until the projected image can enter the human eye in a substantially horizontal or substantially vertical orientation.

According to some additional or alternative embodiments, in the fixing step, the substrate to which the display chip is attached is fixed relative to the rigid structural member of the lighting assembly on which the light converting element is fixedly mounted through a connecting medium.

According to some additional or alternative implementations, in the adjustment step, by adjusting the positioning of the display chip relative to the assembled lighting assembly, the adjustment and determination of the distance between the display module and the rigid structural member is performed. An initial gap is obtained to obtain the adjusted gap; wherein the connecting medium is placed in the adjusted gap.

According to a fourth aspect of the present invention, a method for assembling a projection module is provided, comprising the steps of:

assembling the projection display device of the projection module;

setting the projection lens of the projection module at a preset position of the projection module;

On the basis of the preset position, adjust the position of the projection lens relative to the projection display device until the projection image output by the projection lens of the projection module meets the predetermined requirements; and

The projection lens is fixed relative to the projection display device under the adjusted position.

According to some additional or alternative embodiments, in the adjusting step, the positioning of the projection lens relative to the assembled projection display device is calibrated in an active manner, or the relative position of the projection lens is adjusted using machine vision technology Positioning of the assembled projection display device.

According to some additional or alternative embodiments, the projection image complies with the predetermined requirement comprises: the imaging sharpness of the projection image complies with the corresponding predetermined requirement, the luminance uniformity of the projection image complies with the corresponding predetermined requirement, and the projection image The virtual image meets the corresponding predetermined requirements.

According to some additional or alternative embodiments, the step of assembling the projection display device of the projection module includes:

Fixing and installing the light converting element and the light source module of the lighting assembly inside the first rigid structural member and the second rigid structural member respectively;

fixing the rigid structural member and the second rigid structural member on the support plate; and

The display chip is fixedly mounted on the first rigid structure.

According to some additional or alternative embodiments, the step of assembling the projection display device of the projection module further includes:

Before the rigid structural member and the second rigid structural member are fixedly mounted on the support plate, the rigid structural member and the second rigid structural member are positioned and connected to each other by means of snap connection.

In the adjusting step, the positioning of the projection lens relative to the rigid structural member is adjusted from the outside of the rigid structural member, so as to adjust the positioning of the projection lens relative to the projection display device.

Adjusting the inclination angle of the projection lens relative to the rigid structural member on which the light converting element is fixedly installed, until the imaging clarity of the projection image output by the projection lens meets the corresponding predetermined requirements;

Translate the projection lens relative to the rigid structural member in an xoy plane until the brightness uniformity of the projected image meets the corresponding predetermined requirements, wherein the xoy plane is based on a light-reversing element perpendicular to the light-transmitting element from the lighting assembly the direction of the light directed towards the display chip;

Translate the projection lens relative to the rigid structural member along the z direction until the virtual image of the projected image meets the corresponding predetermined requirements, wherein the z direction is from the light converting element of the lighting assembly to the display chip the direction of the light.

According to some additional or alternative embodiments, in the fixing step, the projection lens is fixed relative to the rigid structural member of the lighting assembly on which the light converting element is fixedly mounted by means of a connecting medium.

According to some additional or alternative embodiments, in the adjustment step, by adjusting the positioning of the projection lens relative to the assembled projection display device, the projection lens and the rigid structural member fixedly installed with the light conversion element are determined. The gap between; wherein, the connecting medium is placed in the gap.

According to a fifth aspect of the present invention, a method for assembling a near-eye display device is provided, comprising the steps of:

Position and install the projection module on the bracket;

adjusting the positioning of the waveguide sheet relative to the bracket until the center of the light projected by the projection module falls on the center of the coupling region of the waveguide sheet; and

The waveguide sheet is fixed relative to the bracket under the adjusted position.

The above features, operations and advantages of the present invention will become more apparent from the following description and accompanying drawings.

Description of drawings

The above and other objects and advantages of the present invention will be more fully apparent from the following detailed description taken in conjunction with the accompanying drawings, wherein the same or similar elements are designated by the same reference numerals.

FIG. 1 is a schematic diagram of a basic structure of a projection module according to an embodiment of the present invention, which shows a receiving camera used in the adjustment process of the projection module.

FIG. 2 is a schematic diagram showing the basic structure of the projection module of the embodiment of FIG. 1 from another perspective.

FIG. 3 is a schematic structural diagram of the first rigid structure of the projection module of the embodiment shown in FIG. 1 , the light converting element and the projection lens fixedly mounted thereon.

FIG. 4 is a schematic structural diagram of the first rigid structure of the projection module of the embodiment shown in FIG. 1 , the light converting element, the projection lens and the display module fixedly mounted thereon.

FIG. 5 is a schematic diagram of an optical path principle of the projection module of the embodiment shown in FIG. 1 .

FIG. 6 is a schematic diagram of another optical path principle of the projection module of the embodiment shown in FIG. 1 .

FIG. 7 is a schematic diagram of a light path principle of a projection module according to another embodiment of the present invention.

FIG. 8 is a flowchart of a method for assembling a projection module according to an embodiment of the present invention.

FIG. 9 is a flowchart of a method for assembling a projection module according to another embodiment of the present invention.

FIG. 10 is a schematic structural diagram of a near-eye display device according to the first embodiment of the present invention.

FIG. 11 is a schematic structural diagram of the near-eye display device of the embodiment shown in FIG. 10 from another perspective.

FIG. 12 is a top view of the near-eye display device of the embodiment shown in FIG. 10 , wherein an enlarged view of a partial area A of the receiving structure is also shown.

13 is a schematic structural diagram of a waveguide sheet used in the near-eye display device according to the first embodiment of the present invention, wherein FIG. 13( a ) and FIG. 13( b ) respectively show the waveguide sheet from different perspectives.

FIG. 14 is a schematic structural diagram of a near-eye display device according to a second embodiment of the present invention.

FIG. 15 is a schematic structural diagram of the near-eye display device of the embodiment shown in FIG. 14 from another perspective.

FIG. 16 is a top view of the near-eye display device of the embodiment shown in FIG. 14 , wherein an enlarged view of a partial area B of the receiving structure is also shown.

FIG. 17 is a schematic diagram of positioning and installing the projection module of the near-eye display device of the embodiment shown in FIG. 14 .

18 is a schematic structural diagram of a waveguide sheet used in a near-eye display device according to a second embodiment of the present invention, wherein FIG. 18( a ) and FIG. 18( b ) respectively show the waveguide sheet from different perspectives.

19 to 21 are schematic structural diagrams of a near-eye display device according to a third embodiment of the present invention.

FIG. 22 is a schematic structural diagram of a near-eye display device according to a fourth embodiment of the present invention.

23 is a flowchart of a method of assembling a near-eye display device according to an embodiment of the present invention.

detailed description

The present invention is described more fully hereinafter by referring to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. However, the present invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. The above-described embodiments are given to make the disclosure herein complete and complete, so as to make the understanding of the protection scope of the present invention more comprehensive and accurate.

In the following description, for the sake of clarity and conciseness, not all of the various components shown in the figures are described. The various components shown in the drawings provide those of ordinary skill in the art with a fully enabled disclosure of the present invention. The operation of many components will be familiar and obvious to those skilled in the art in light of this disclosure.

Herein, the orientation terms of "upper", "lower", "left", "right", "front" and "rear" are relative to the orientation of the projection module/near-eye display device in the accompanying drawings after installation and use or relative It is defined by the orientation shown in the drawings, and it should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, which may vary according to the orientation in which the opening and closing device is placed. change accordingly.

The applicant also noted that a projection module usually includes a display device and a projection lens, and the relative positions of the display device and the projection lens directly determine the quality of the projected image. Tolerance, so that the image projected by the projection module will appear distorted when it reaches the human eye. In addition, assembly tolerances inevitably exist in the assembly process of multiple components of the display device (such as light source modules, display chips, and optical elements for light splitting and light combining), which easily lead to distortion of the projected image of the projection module.

In order to facilitate understanding and explanation, in the relevant figures of the projection module 10, the x-direction, the y-direction and the z-direction are defined based on the orientation of the projection module, wherein the x-direction corresponds to the direction of the light emitted from the light-changing element to the projection lens. The z-direction corresponds to the direction of light emitted from the light converting element to the display chip, and the y-direction is substantially perpendicular to the xoz plane.

The projection module 10 according to an embodiment of the present invention is described below with reference to FIGS. 1 to 4 . The projection module 10 of the following example can be actively adjusted and then assembled before being installed on a near-eye display device (eg, the near-eye display device 200 in FIG. 8 ), so as to overcome the problems caused by the projection module 10 , for example, generated during the assembly process. Assembly tolerances, etc., make the projected image output by the projection module 10 (which can be projected onto the waveguide sheet) have good image quality (eg, less distortion).

1 and 2 , the projection module 10 according to the embodiment of the present invention includes a projection display device 11 and a projection lens 13 . The projection display device 11 may include an illumination assembly 111 and a display module 113 with a display chip 1130 . The projection module 10 or the lighting assembly 111 may further include a first rigid structural member 121 . For ease of understanding, FIGS. 1 to 4 illustrate the display module 113 separated from the first rigid structural member 121. It will be understood that after the projection module 10 is assembled, the display module 113 is positioned and fixed on the first rigid structure 121. on the rigid structural member 121 .

The lighting assembly 111 may include a light source module 1110 and at least one light converting element 1112, and the light converting element 1112 may at least partially redirect the light emitted by the light source module 1110 to the display chip 1130 (see FIG. 5 , the S light of the light emitted by the light source module 1110). is deflected and reflected to the LCOS chip), or the light returned by the display chip 1130 can be deflected at least partially to the projection lens 13 (see FIG. 6, the S light used to form the projected image is deflected and reflected to the projection lens 13) , therefore, the light converting element 1112 can have the function of light splitting, which can be specifically, but not limited to, the PBS (Polarization Beam Splitter, polarization beam splitter) prism exemplified in FIGS. 5 and 6 , which can also be, for example, as shown in FIG. 7 . out TIR (Total Internal Reflection) prism. For example, the light source module 1110 may include a light source, etc., and a light homogenizing element (such as a collimating mirror) may also be provided corresponding to the light source, and the light emitted by the light source enters the light converting element 1112 after passing through the light homogenizing element; further, the light source may also be set to two One or three (for example, red light source, blue light source, color filter light source), three corresponding light source devices can be arranged in one structural member, and then combined by color combination optical elements to form RGB light source. It will be appreciated that the specific arrangement of the light source module 1110 is not limiting.

The display chip 1130 of the display module 113 may be a passive light emitting display, for example, it may specifically be an LCOS (Liquid Crystal on Silicon) chip (as shown in FIGS. 5 and 6 ) or a DLP (Digital Light Processing, digital optical processing) chip (as shown in FIG. 7 ), etc., the display module 113 further includes a substrate 1131 for mounting the display chip 1130 , wherein the display chip 1130 can be pre-mounted on the inner side of the substrate 1131 . During the assembly process, the display chip 1130 and the substrate 1131 The positioning relative to eg the first rigid structure 121 can be adjusted together.

Continuing as shown in FIGS. 1 to 4 , the projection module 10 or the lighting assembly 111 further includes a second rigid structural member 122 , and a support plate 123 is provided corresponding to the first rigid structural member 121 . The two rigid structural members 122 and the support plate 123 are used for positioning and installing each optical element of the lighting assembly 111 so that the light path of the lighting assembly 111 is fixed after the lighting assembly 111 is assembled.

The first rigid structural member 121 and the second rigid structural member 122 may be fixedly mounted on the support plate 123; the first rigid structural member 121 may be substantially configured as a hexahedron, and the inner cavity of the first rigid structural member 121 may accommodate at least And fixed with the light converting element 1112 (see FIG. 3 and FIG. 4 ). In one embodiment, the first rigid structure 121 may also be used to position and install the display module 113 and/or the projection lens 13 ; the second rigid structure 122 may be substantially configured as a hexahedron, and the inner cavity of the second rigid structure 122 The light source module 1110 can be accommodated and fixed, for example, the light source, collimating mirror, etc. of the light source module 1110 are fixedly installed in the inner cavity of the second rigid structural member 122 .

It will be understood that the first rigid structural member 121 and the second rigid structural member 122 are separated from each other before assembly, and they are positioned and installed with each other; in other embodiments, the first rigid structural member 121 and the second rigid structural member 122 may also be set in one piece.

FIG. 5 shows a schematic diagram of an optical path principle of the projection module of the embodiment of FIG. 1 . 5, the LCOS chip represents the display chip 1130, which can modulate the light source to form an image, the PBS prism represents the light converting element 1112, the light source and the collimator mirror represent the light source module 1110; in this embodiment, the LCOS chip, the PBS prism and the projection lens 13 to form a straight optical path, which can be formed by fixing their positions during assembly so that they are arranged in a substantially straight line. In the process of projection imaging, the light emitted by the light source enters the PBS prism through the collimator lens, and the S light of the light can be refracted and reflected to the LCOS chip through the PBS prism, and the LCOS chip will proportionally controllable the S light received by its different pixels Converted to P light for forming a projected image, the P light passes straight through the PBS prism and is directed toward the projection lens 13 . Therefore, the projection lens 13 can form, for example, a color projection image to be projected out.

FIG. 6 shows a schematic diagram of another optical path principle of the projection module in the embodiment of FIG. 1 . Referring to FIG. 6 , the LCOS chip represents the display chip 1130, which can modulate the light source to form an image, the PBS prism represents the light converting element 1112, the light source and the collimating mirror represent the light source module 1110, and it is also shown that the light source module 1110 is not specifically shown in FIG. 1. In this embodiment, the LCOS chip, the PBS prism, and the projection lens 13 form a straight optical path, and the described can be formed by fixing their positions during assembly so that they are arranged in a substantially straight line. straight light path. In the projection imaging process, the light emitted by the light source enters the PBS prism through the collimating mirror, and the S light of the light is substantially completely reflected by the PBS prism to the wave plate (which is not shown) and the total reflection mirror, and the wave plate will The S light is converted into P light, and then the P light is reflected by the total reflection mirror to the PBS prism, and the P light passes through the PBS prism and is projected to the LCOS chip, which The S light of the projected image and the S light used to form the projected image are deflected and reflected to the projection lens 13 by the PBS prism. Therefore, the projection lens 13 can form, for example, a color projection image to be projected out.

As can be seen from the optical path shown in FIG. 5 or FIG. 6 , the optical path of the projection module 10 is complex and there are many internal components. Apart from the precision errors in the manufacture of various components themselves, errors will inevitably occur in the assembly process of many components. More importantly, the display chip 113 modulates the incident light to form an image, so its assembly accuracy is easily directly related to the quality of the projection pattern, and the display chip 113 itself has high requirements for the angle of the incident light, which needs to be within a certain range, otherwise it will cause Projected images are prone to negative effects (such as aberrations or chromatic aberrations, etc.).

In order to overcome problems such as image distortion caused by assembly errors, in one embodiment, there is a gap (not shown in the figure) between the display module 113 and the first rigid structural member 121 , and the gap reflects the relative relationship between the display chip 1130 and the lighting assembly. Positioning of 111 ; in the assembled projection module 10 , a connection medium (eg, cured colloid) is provided in the gap, and the connection medium fixes the display module 113 on the first rigid structural member 121 .

It will be understood that before setting the connecting medium (eg, before painting the glue), the gap is movable to allow adjustment of the positioning of the display module 113 relative to the first rigid structure 121, and after setting the connecting medium (eg, after the glue is cured), the The gap is determined and fixed, and the positioning of the display module 113 relative to the first rigid structural member 121 is fixed, that is, the positioning of the display chip 1130 relative to the lighting assembly 111 is fixed. Therefore, the existence of this gap will allow the positioning of the display module 113/display chip 1130 to be actively adjusted after the lighting assembly 111 has been substantially assembled, until the adjustment is made until the projected image output by the projection lens 13 meets the predetermined requirements; and , the gap reflecting the better positioning of the display module 113 is easily fixed by a connecting medium such as colloid, so that the adjusted positioning of the display module 113/display chip 1130 is always reflected in the projection module 10 and used. Therefore, the projection module 10 with this gap can easily overcome the unavoidable internal tolerances inside the lighting assembly 111 to realize that the optical axes between the projection lens 13 and the display chip 1130 are basically consistent, and even realize the projection lens 13 and the light converting element. 1112. The optical axes between the display chips 1130 are basically the same.

The gap between the display module 113 and the first rigid structural member 121 can be determined and fixed by, for example, the following method (ie, the first method): actively adjusting the overall positioning of the display module 113 relative to the first rigid structural member 121, and then using, for example, a glue The display module 113 is fixedly mounted on the first rigid structural member 121 .

In other embodiments, there is a gap (not shown in the figure) between the projection lens 13 and the first rigid structural member 121, and the gap reflects the positioning of the projection lens 13 relative to the projection display device 11; in the assembled projection module 10 Among them, a connection medium (eg, cured colloid) is provided in the gap, and the connection medium fixes the projection lens 13 on the first rigid structural member 121 . It will be understood that before setting the connection medium (eg, before applying the glue), the gap is movable to allow adjustment of the positioning of the projection lens 13 relative to the first rigid structure 121, and after setting the connection medium (eg, after the glue is cured), The gap is determined and fixed, and the positioning of the projection lens 13 relative to the first rigid structural member 121 is fixed, that is, the positioning of the projection lens 13 relative to the assembled projection display device 11 is fixed. Therefore, the existence of this gap will allow the positioning of the projection lens 13 to be actively adjusted after the projection display device 11 has been basically assembled, until the adjustment is made until the projected image output by the projection lens 13 meets the predetermined requirements; and, the reflection display The better positioning gap of the module 113 is easily fixed by a connecting medium such as colloid, so that the adjusted positioning of the projection lens 13 is always reflected in the projection module 10 and used. Therefore, the projection module 10 with this gap can easily overcome the unavoidable internal tolerance (including the installation tolerance of the display module 113 ) inside the projection display device 11 to realize that the optical axes between the projection lens 13 and the display chip 1130 are basically consistent, It is even achieved that the optical axes between the projection lens 13 , the light converting element 1112 and the display chip 1130 are basically the same.

The gap between the projection module 10 and the first rigid structural member 121 can be determined and fixed by, for example, the following method (ie, the second method): actively adjusting the overall positioning of the projection lens 13 relative to the first rigid structural member 121 and then by, for example, The colloid fixes the projection lens 13 on the first rigid structural member 121 .

Since in the assembled projection module 10, the optical axis consistency between the projection lens 13 and the display chip 1130 is good, it will be beneficial to form a high-quality projection image, for example, to form a projection image that meets predetermined requirements.

During the above positioning process of the display chip 1130 or the projection lens 13, the receiving camera 91 as shown in FIG. 1 can be used to help determine the positioning; the receiving camera 91 can be fixedly arranged at the light output position of the projection module 10 to receive Projection image: With the received projection image, the relative position of the display chip 113 and the lighting assembly 111 can be adjusted in real time (when the display chip 113 is fixedly installed), or the relative position of the projection lens 13 and the projection display device 11 can be adjusted in real time.

It will be understood that the predetermined requirements for the projected image can be determined in advance, for example, in a projection module with good assembly accuracy and good optical axis consistency between the projection lens 13 and the display chip 1130; the predetermined requirements are determined in advance in the projection lens 13 When the output projection image (the quality of which can be determined and acquired by the receiving camera 91 ) meets the predetermined requirements, the optical axis between the projection lens 13 and the display chip 1130 is determined to be substantially consistent. Specifically, that the projected image meets the predetermined requirements includes: the imaging clarity of the projected image meets the corresponding predetermined requirements, the brightness uniformity of the projected image meets the corresponding predetermined requirements, and the virtual image distance of the projected image meets the corresponding predetermined requirements; or further includes: The projected image can enter the human eye in a substantially horizontal or substantially vertical orientation (in the case where, for example, the display module 113 can be rotated relative to the first rigid structure 121 in the xoy plane).

As shown in FIG. 1 to FIG. 4 , the first rigid structural member 121 may have a hexahedral structure as a whole, wherein at least three sides have windows, and the side facing the light source module 1110 is opened with a second window 126 (ie, the light incident window). ), the side facing the projection lens 13 is provided with a third window 127 (ie, a light exit window, which outputs the outgoing light to the projection lens), and the side facing the display module 113 is provided with a first window 124 ( display window). Both the light incident window and the light exit window are arranged along the x-direction, and the display window may open toward the z-direction.

The outer side of the first opening 124 may be provided with a step 1212 (see FIG. 4 ). The step 1212 is used to support and position the display module 113. After the display module 113 is actively adjusted, its relative position to the lighting assembly 111 can be determined ( The gap between the display module 113 and the first rigid structural member 121 is determined), and can be fixed at the opening of the first opening 124 of the first rigid structural member 121 by glue, wherein the glue is arranged on the step 1212, The glue firmly connects the steps of the first rigid structure 121 and the substrate 1131 of the display module 113 , so that the gap between the display module 113 and the first rigid structure 121 described above can be formed. The display module 113 and the light converting element 1112 are respectively located on the upper and lower sides of the first window 124, for example.

The substrate 1131 may be, but not limited to, a ceramic or metal substrate, which has relatively high strength and heat dissipation performance. In the process of adjusting the positioning of the display module 113, the display module 113 can be fixed on an external adjustment mechanism by clamping or suction, and the ceramic or metal substrate with greater strength can make it clamped by the adjustment mechanism. Or it is not easy to deform when sucking. Optionally, the substrate 1131 further includes a layer of circuit board, and the display chip 1130 (eg, an LCOS chip) is electrically connected to the circuit board.

The fixed gap between the display module 113 and the first rigid structural member 121 is in the range of 0.05 mm or more and 1 mm or less; or, when the optical axes of the optical components of the lighting assembly 111 are highly consistent, The fixed gap between the display module 113 and the first rigid structural member 121 is in the range of greater than or equal to 0.1 mm and less than or equal to 0.6 mm. Correspondingly, the thickness of the connecting medium (eg, colloid) disposed on the step 1212 is in the range of 0.05 mm or more and 1 mm or less, or, further, the optical axis consistency of each optical component in the lighting assembly 111 is relatively high In the case of , the thickness of the connection medium (eg, colloid) provided on the step 1212 is in the range of greater than or equal to 0.1 mm and less than or equal to 0.6 mm.

It will be understood that the thickness of the connection medium (eg, glue) or the fixed gap between the display module 113 and the first rigid structure 121 may be arranged unequally within the above range to ensure that the display module 113 is relatively opposite to the first rigid structure 121 of various oblique positioning.

In one embodiment, the shape of the colloid between the substrate 1131 and the first rigid structural member 121 is configured to be able to seal all the gaps between the substrate 1131 and the first opening 124; for example, the colloid can be arranged in a ring shape , so that the inner space of the first rigid structural member 121 can be sealed. In this way, unwanted stray light and dust can be prevented from entering the inside of the first rigid structural member 121 .

Further, at least a mounting wall is provided on the third opening 127 for mounting the projection lens 13 . In the above-mentioned first method, the projection lens 13 can be fixed on the third opening 127 through a connecting medium such as colloid before the display module 113 , and the display module 113 can be positioned and installed on the first opening from the outside of the first rigid structure 121 . On the window 124 (for example, on the step 1212 exposed on the outer path of the first rigid structural member 121 ), so as to achieve precise positioning and installation of the display chip 1130 relative to the lighting assembly 111 .

It should be noted that, in the miniature projection module 10, not only the display chip 1130 and other optical components are small in size, but their installation space is also small, so it is generally difficult to perform internal adjustment to achieve high optical axis consistency; the above embodiments The projection module 10 can fix the display module 113 on the outside of the first rigid structural member 121 and the light converting element 1112 on the inside of the first rigid structural member 121 . Carrying out active adjustment is beneficial to facilitate adjustment and obtain accurate positioning results or gaps, and it is also convenient to perform fixed installation after the positioning is adjusted (for example, to fix the gap between the display module 113 and the first rigid structural member 121 ); Therefore, it is beneficial to obtain better optical axis consistency and improve the quality of the projected image.

Continuing to refer to FIG. 1 and FIG. 2 , the side of the second rigid structural member 122 facing the light converting element 1112 is also provided with a window for the incident light emitted by the light source. Before the first rigid structure 121 is installed on the support plate 123, the first rigid structure 121 and the second rigid structure 122 can be positioned and connected to each other. The installation accuracy of a rigid structural member 121 improves the optical axis consistency of the light source, collimating mirror, PBS prism and other optical elements at the same time.

In one embodiment, the second rigid structural member 122 and/or the first rigid structural member 121 may be provided with chamfers or steps in the contact area of the two structural members to form the glue-painting area 233, and the glue in the glue-painting area 233 may The second rigid structure 122 and the first rigid structure 121 are connected to each other before they are mounted on the support plate 123 . Further, referring to FIG. 1 and FIG. 2 , the first rigid structural member 121 and the second rigid structural member 122 may also be connected together by a snap connection. Specifically, two side walls of the second rigid structural member 122 are provided with a pair of protruding portions 124a, and the protruding portions 124a are disposed protruding toward the first rigid structural member 121 along the x-direction. Correspondingly, the first rigid structural member 121; A pair of concave parts 124b are provided on the side walls, and the concave parts 124b are concave inwards to receive the protruding parts 124a; by configuring the shapes of the protruding parts 124a and the concave parts 124b, they can be formed into a snap-fit structure 124; the second rigid structure 122 and the The first rigid structural member 121 is positioned and connected through the clip structure 124 , so as to improve the positioning accuracy and connection strength between the second rigid structural member 122 and the first rigid structural member 121 . It will be understood that, after the second rigid structure member 122 and the first rigid structure member 121 are snapped together, they may be further fixedly connected by, for example, glue.

It will be understood that in the case where the second rigid structure 122 and the first rigid structure 121 are connected to each other, the support plate 123 mainly serves the functions of fixation and reinforcement. In other embodiments, the second rigid structure member 122 and the first rigid structure member 121 may be fixedly connected to each other during the process of installing the second rigid structure member 122 and the first rigid structure member 121 to the support plate 123, and the support plate 123 may also function as a positioning connection.

In one embodiment, as shown in FIG. 2 , the support plate 123 is provided with a drawing glue groove 1231 and a limiting structure 1232; the drawing glue groove 1231 can be a through structure, and a connecting medium such as colloid can be set in the drawing glue groove 1231. The colloid can be used to fixedly install the second rigid structural member 122 and/or the first rigid structural member 121; the limiting structure 1232 is mainly provided corresponding to the first rigid structural member 121, and is used to limit and install the first rigid structural member 121 on the on the support plate 123 . The limiting structure 1232 may specifically include one or more pairs of limiting holes, and correspondingly, corresponding limiting structures including one or more pairs of limiting posts 1212 may be correspondingly disposed at the bottom of the first rigid structural member 121 . In other embodiments, the limiting structure 1232 may also be provided corresponding to the second rigid structural member 122 (for example, a corresponding limiting column may also be provided on the second rigid structural member 122 ). The lighting assembly 111 (including the first rigid structural member 121 and the second rigid structural member 122 ) is integrally positioned and mounted on the support plate 123 in a limited manner through the limiting structure of the above embodiment.

It should be noted that, the display chip 1130 described in the above example can be positioned and installed relative to the lighting assembly 111, or the projection lens 13 can be positioned and installed relative to the projection display device 11. The first rigid structural member 121 and the second rigid structural member 122 can be integrally installed on the support plate. 123 and after, so that by actively adjusting the positioning of the display chip 1130 relative to, for example, the first rigid structural member 121/actively adjusting the positioning of the projection lens 13 relative to, for example, the first rigid structural member 121, the lighting assembly 111 that has been basically assembled / The installation error of various components inside the display device 11 will be considered in the active adjustment process, and the problem of poor optical axis consistency between the projection lens 13 and the display chip 1130 caused by the error can be effectively overcome.

FIG. 7 is a schematic diagram showing the principle of an optical path of a projection module according to another embodiment of the present invention. In the projection module of this embodiment, the display chip 1130 may be a DMD chip, and the light converting element 1112 is correspondingly configured as a TIR prism.

The following describes a specific assembling method of the projection module 10 according to an embodiment of the present invention with reference to FIG. 8 .

First, in step S801 , the lighting assembly 111 of the projection module 10 is assembled, especially, the light converting element 1112 of the lighting assembly 111 is fixedly installed on the rigid structural member 121 .

In this step, the optical devices and the like of the lighting assembly 111 may be assembled using the first rigid structural member 121, the second rigid structural member 122, and the like. First, provide the various components required for assembly, such as the first rigid structure 121, the second rigid structure 122, the support plate 123, the light source, the collimating mirror, the light converting element 1112, etc.; further, paste the light source and the collimating mirror Attached to the inner cavity of the second rigid structure 122, and the light converting element 1112 is attached to the inner cavity of the first rigid structure 121; optionally, the projection lens 13 can also be attached to the first rigid structure 121 , wherein, the projection lens 13 can be set at the light exit position of the light converting element 1112 , for example, at the opening of the third opening 127 positioned and installed on the first rigid structural member 121 . Then, the second rigid structural member 122 and the first rigid structural member 121 can be positioned and connected to each other in a snap-fit manner through the snap-fit structure 124, and fixed by a connecting medium such as glue.

In step S801, the first rigid structural member 121 and the second rigid structural member 122 that are fixedly connected together can be further positioned and installed on the support plate 123 as a whole. The rigid structural member 121 and the second rigid structural member 122 are integrally positioned and mounted on the support plate 123 .

It should be noted that in this step S801, two separate structural members (ie, the first rigid structural member 121 and the second rigid structural member 122) are used, and the light source module 1110 and the light converting element 1112 can be respectively arranged in two separate structural members. Therefore, the corresponding parts of the lighting assembly 111 can be accurately attached to the corresponding structural members using machine vision technology, which is beneficial to improve the assembly accuracy of the lighting assembly 111, and also improves the relationship between the various optical elements inside the lighting assembly 111. optical axis consistency.

Further, in step S802 , the display module 113 with the display chip 1130 is set at a preset position of the projection module 10 , so that an initial gap is left between the display module 113 and the rigid structural member 121 .

It should be noted that the preset position can realize the rough positioning of the display module 113 relative to the first rigid structural member 121, and the preset position does not take into account the assembly tolerance generated in step S801, for example, when the display module 113 is placed in the preset position , the projection image generated by the projection module 10 is easily distorted, for example.

The preset position can be located outside the first rigid structural member 121; for multiple projection modules 10, the preset position of the display module 113 can be uniformly determined relative to the first rigid structural member 121; external equipment can be used to control the The components of the external device to which the display module 113 is adsorbed are moved to place the display module 113 in the preset position.

Further, in step S803, on the basis of the preset position, the positioning of the display module 113 relative to the basically assembled lighting assembly 111 is adjusted until the projected image output by the projection lens 13 of the projection module 10 meets the predetermined requirements, so Accordingly, the initial gap is adjusted and determined to be the adjusted gap.

In this step S803, the display chip 1130 is pre-fixed on the substrate 1131, so the positioning of the display chip 1130 can be adjusted through the adjustment of the positioning of the display module 113 relative to the lighting assembly 111 (eg, the first rigid structure 121). to realise.

In this step S803, the corresponding assembly system can be used to continuously debug the positioning of the display module 113 relative to the lighting assembly 111 (eg, the first rigid structural member 121) until the projection image received by the receiving camera 91 meets the predetermined requirements.

In one embodiment, the assembly system may include a six-axis platform, and the display module 113 is fixed to the six-axis platform by clamping jaws or suction nozzles. The orientation of 1112 is convenient for automatic adjustment.

During the adjustment process, the projection module 10 is powered on to project a specific pattern, and the relative positional relationship between the display module 113 and the lighting assembly 111 is adjusted in real time according to the image information received by the receiving camera 91. The adjustment direction may include six-axis adjustment ( For example, the translation in the x/y/z direction, the rotation around the z/y/z direction, the plane perpendicular to the central ray of the display chip 1130 is defined as the xoy plane), until the image received by the receiving camera 91 conforms to the predetermined According to the standard, the relative position between the display module 113 and the lighting assembly 111 at this time is determined. Wherein, when judging whether the image received by the receiving camera 91 conforms to the standard, the image aberration calculated by the computer can be used to obtain the direction, scale, angle, etc. that need to be adjusted for the display chip 1130; The resolution data of the series of images can obtain parameters such as the relative inclination angle, translation amount and distance between the display chip 1130 and the light converting element 1112 (or the projection lens 13 ); and then the six-axis platform can adjust the display chip 1130 and the light converting element based on these parameters. The relative position between 1112.

During the calibration process, the positioning adjustment of the display module 113 may include the following actions:

Adjust the inclination angle of the display module 13 relative to the first rigid structural member 121 until the imaging clarity of the projection image output by the projection lens 13 of the projection module 10 meets the corresponding predetermined requirements;

The displayed module 113 is translated relative to the first rigid structural member 121 in the xoy plane until the brightness uniformity of the projected image meets the corresponding predetermined requirements, wherein the xoy plane is based on a direction perpendicular to the light passing from the light diverting element 1112 of the lighting assembly 111. the direction of the light toward the display chip 1130 (as shown in FIG. 1 );

Translate the display module 113 relative to the first rigid structural member 121 in the z direction until the virtual image distance of the projected image meets the corresponding predetermined requirements, wherein the z direction is from the light converting element 1112 of the lighting assembly 111 to the display chip 1130 The direction of the light (as shown in Figure 1);

The display module 113 is rotated relative to the first rigid structure 121 in the xoy plane until the projected image can enter, for example, the human eye or the receiving camera 91 in a substantially horizontal or substantially vertical orientation.

It will be understood that since the light converting element 1112 has been fixed in the first rigid structural member 121, adjusting the positioning of the display module 113/display chip 1130 relative to the first rigid structural member 121 also means adjusting the relative positioning of the display module 113/display chip 1130 relative to the first rigid structural member 121. Positioning of the light converting element 1112.

In this step S803, the positioning of the display module 113 with the display chip 1130 relative to the first rigid structural member 121 can be adjusted from the outside of the first rigid structural member 121 by means of, for example, a six-axis platform, which is beneficial to facilitate adjustment and obtain accurate The positioning result is also convenient for fixed installation after the positioning is adjusted; thus, it is beneficial to obtain better optical axis consistency and improve the quality of the projected image.

In step S803, the positioning of the display chip 1130 relative to the substantially assembled lighting assembly 111 may be calibrated in an active manner, or the position of the display chip 1130 relative to the substantially assembled lighting assembly 111 may be adjusted using machine vision technology.

Through the adjustment process in step S803 , the display module 113 is further accurately positioned relative to the first rigid structural member 121 , that is, the display chip 1130 is further accurately positioned relative to the light converting element 1112 , the projection lens 13 , etc. fixed on the first rigid structural member 121 . , which overcomes the problems caused by the assembly error of the lighting assembly 111 and the tolerance of the component itself, so that the optical axis consistency among the display chip 1130 , the light converting element 1112 , and the projection lens 13 is good.

Further, in step S804, the display module 113 is fixed relative to the lighting assembly 111 under the adjusted positioning.

It will be understood that the adjusted positioning in step S803 can be determined or recorded, and the adjusted positioning can specifically represent that, under this positioning condition, the imaging clarity of the projected image meets the corresponding predetermined requirements, and the brightness uniformity of the projected image The corresponding predetermined requirements are met, the virtual image distance of the projected image meets the corresponding predetermined requirements, and the projected image can enter the human eye in a substantially horizontal or substantially vertical orientation. Under the adjusted positioning, the adjusted gap between the display module 113 and the first rigid structural member 121 is determined.

In this step S804 , the substrate 1131 to which the display chip 1130 is attached can be fixed relative to the first rigid structural member 121 through a connecting medium such as glue, and the glue is placed in the gap between the display module 113 and the first rigid structural member 121 For example, glue is applied and cured on step 1212 , sealing first fenestration 124 .

The assembly method of the above embodiment can form the projection module 10 of an embodiment of the present invention after the assembly is completed. Through the active adjustment process of step S803, the assembly error or the lighting assembly element generated in the assembly process of step S801 can be overcome. Due to its own tolerance, the optical axes between the display chip 1130, the light converting element 1112 and the projection lens 13 are basically consistent, which greatly improves the quality of the projected image.

The following describes a specific assembling method of the projection module 10 according to another embodiment of the present invention with reference to FIG. 9 .

First, in step S901, the projection display device 11 of the projection module 10 is assembled.

It should be noted that this step S901 is similar to the step S801 of the embodiment shown in FIG. 8 ; however, relative to the step S801, the step S901 also fixedly installs the display module 113 on the first rigidity based on, for example, the preset position of the step S802. At the opening of the first opening 124 of the structural member 121, it is difficult to achieve the precise positioning in the above step S803 by such fixed installation.

Specifically, step S901 includes: fixing the light converting element 1112 and the light source module 1110 of the lighting assembly 111 inside the first rigid structural member 121 and the second rigid structural member 122, respectively; The rigid structural members 122 are positioned and connected to each other by snap connection; the first rigid structural member 121 and the second rigid structural member 122 are fixedly installed on the support plate 123 ; the display chip 1130 is fixedly installed on the first rigid structural member 121 .

Step S902 , setting the projection lens 13 of the projection module 10 at a preset position of the projection module 10 . It should be noted that the preset position can realize the rough positioning of the projection module 10 relative to the first rigid structural member 121, the preset position does not take into account the assembly tolerance generated in step S901, for example, the projection lens 13 is placed in the preset position At this time, the projection image generated by the projection module 10 is easily distorted, for example.

Step S903, adjust the positioning of the projection lens 13 of the projection module 10 relative to the basically assembled projection display device 11 until the projected image output by the projection lens 13 of the projection module 10 meets the predetermined requirements.

It should be noted that the adjustment principle and assembly system used in this step S903 can be respectively similar to the adjustment principle and assembly system for the display module 113 in step S803 of the embodiment shown in FIG. 8 , except for the position of the adjustment process. The movable element is transformed into the projection lens 13 by the display module 113 .

In the process of adjusting the positioning of the projection lens 13, the positioning adjustment of the projection lens 13 may include the following actions:

Adjust the inclination angle of the projection lens 13 relative to the first rigid structural member 121 until the imaging clarity of the projection image output by the projection lens 13 meets the corresponding predetermined requirements;

Translate the projection lens 13 relative to the first rigid structural member 121 in the xoy plane until the brightness uniformity of the projected image meets the corresponding predetermined requirements; and

The projection lens 13 is translated relative to the first rigid structure member 121 along the z direction until the virtual image distance of the projected image meets the corresponding predetermined requirement.

Correspondingly, when the projected image output by the projection lens 13 of the projection module 10 meets the predetermined requirements, the optical axis between the projection lens 13 and the display chip 1130 is determined to be substantially consistent; the projected image meeting the predetermined requirements includes: the projected image The imaging clarity of the projection image meets the corresponding predetermined requirements, the brightness uniformity of the projected image meets the corresponding predetermined requirements, and the virtual image distance of the projected image meets the corresponding predetermined requirements.

It will be understood that since the light converting element 1112 and the display chip 1130 have been fixed in the first rigid structure 121, adjusting the positioning of the projection lens 13 relative to the first rigid structure 121 also means adjusting the projection lens 13 relative to the light converting element 1112 and display the positioning of the chip 1130.

Step S904, the projection lens 13 is fixedly installed relative to the projection display device 11 that has been basically assembled under the adjusted positioning. It will be understood that the adjusted positioning in step S903 can be determined or recorded, and the adjusted positioning can specifically represent that, under this positioning condition, the imaging clarity of the projected image meets the corresponding predetermined requirements, and the brightness uniformity of the projected image The corresponding predetermined requirements are met, and the virtual image distance of the projected image meets the corresponding predetermined requirements. Under the adjusted positioning, the gap between the projection lens 13 and the first rigid structural member 121 is determined.

Specifically, the projection lens 13 is fixed relative to the first rigid structural member 121 through a connecting medium such as colloid, and the colloid is placed in the gap between the projection lens 13 and the first rigid structural member 121 .

After the assembly method of the above embodiment is completed, the projection module 10 of the embodiment shown in FIG. 1 can be obtained. Through the active adjustment in step S903, the assembly error that has been generated in the assembly process in step S901 can be overcome, and the display chip can be 1130. The optical axes between the light converting element 1112 and the projection lens 13 are basically consistent, and the consistency of the optical axes is improved, which is beneficial to improve the quality of the projected image.

The applicant noticed that the quality of the image projected by the projection module directly determines the quality of the image received by the human eye from the near-eye display device, and the two-dimensional pupil dilation of the image by the waveguide sheet of the near-eye display device also has angular requirements for the received light, That is, the incident light of the waveguide sheet needs to be within an angle range, so that the light can be transmitted and expanded in the waveguide sheet; therefore, the light rays of different angles of each field of view emitted by the projection module must meet the corresponding angle requirements. The relative positional relationship (such as angle and distance) between the group and the waveguide sheet also has corresponding precision requirements.

The following further examples illustrate the near-eye display device and the assembling method thereof according to the embodiments of the present invention. For the convenience of understanding and description, the X direction, the Y direction and the Z direction are defined based on the orientation of the near-eye display device, wherein the Y direction is a substantially horizontal direction, which is parallel to the direction in which the eyes of the human eye are located, and the Z direction corresponds to the near-eye display. In the height direction of the device, the X direction is substantially perpendicular to the YOZ plane and is substantially parallel to the outcoupling direction of the waveguide sheet, wherein the positive direction of the X direction is opposite to the coupling out direction of the waveguide sheet.

Referring to FIGS. 10-13, a near-eye display device 200 of an embodiment is shown. The near-eye display device 200 mainly includes the projection module 10 , the waveguide sheet 230 and the bracket 210 . The projection module 10 can use the projection module of any of the above embodiments, and the projection image projected by the projection module 10 has little distortion and good quality. The bracket 210 is used for carrying and positioning the projection module 10 and the waveguide sheet 230; the waveguide sheet 230 and the projection module 10 are positioned and installed on the bracket 210, so that the center of the light projected by the projection module 10 roughly falls on the waveguide sheet 230 at the center of the coupling region 232 .

As shown in FIG. 10 and FIG. 11 , in one embodiment, the two projection modules 10 on the left and right sides corresponding to the eyes can be fixedly installed on the bracket 210 along the X direction, so that each projection module 10 is substantially vertical It is positioned and installed on the bracket 210 in alignment with the coupling region 232 of the waveguide sheet 230; specifically, during the assembly process between each projection module 10 and the bracket 210, the position can be determined by the limiting structure first, and then painted with glue. The relative positions of the two are fixed by means of exposure, so that each projection module 10 is fixedly installed on the bracket 210 , for example, on the support plate 213 of the fixed installation bracket 210 . It should be noted that the support plate 213 can replace the support plate 123 of the projection module 10 (see FIG. 1 ), or can be integrally provided with the support plate 123 of the projection module 10 .

As shown in FIG. 13 , the waveguide sheet 230 has an in-coupling area 232 , an out-coupling area 231 and a glue-painting area 233 ; the coupling-in area 232 is used to receive the light projected by the projection module 10 and transmit it in the waveguide sheet and two-dimensional pupil dilation, the final image light is output from the coupling-out area 231 and observed by the human eye; the glue-painting area 233 reserved on the waveguide sheet 230 is not subjected to grating engraving.

It will be understood that the specific position of the coupling region 232 on the waveguide sheet 230 can be set according to the installation orientation of the projection module 10 on the bracket 210 , so as to facilitate the projection image of the projection module 10 to enter the coupling region 232 .

When the incident light is coupled in the coupling region 232, the angle between the light and the surface of the waveguide sheet 230 will affect the transmission efficiency of the waveguide sheet, and an unsuitable coupling angle will also cause distortion of the finally observed image; therefore, for the waveguide sheet 230 Perform real-time active adjustments for optimal image quality. It is worth noting that since there are always errors in the grating engraving on the waveguide sheet 230, active adjustment of the waveguide sheet 230 can also compensate for the influence of this part of the error on the output image. In addition, by actively adjusting the position of the waveguide sheet 230 relative to the projection module 10, the light center of the projection module 10 just falls in the center of the coupling region 232 of the waveguide sheet, which ensures that the projected image is not distorted, and reduces the amount of light. can lose.

Continuing to refer to FIGS. 10 and 11 , the two projection modules 10 are approximately located on the outcoupling side of the waveguide sheet 230 (ie, the side corresponding to the human eye), so that the projection modules 10 can be coupled from the outcoupling side to the waveguide sheet Coupling region 232 of 230 projects a projected image. In other embodiments, the projection module 10 can also be located approximately on the opposite side of the out-coupling side of the waveguide sheet 230 , so that the projection module 10 can project the projection from the opposite side of the out-coupling side to the coupling-in region 232 of the waveguide sheet 230 image.

In one embodiment, receiving structures 220 are formed on the support 210, for example, two left and right receiving structures 220 corresponding to the two waveguide sheets 230 respectively; the receiving structures 220 at least partially receive the waveguide sheets 230; the waveguide sheet 230 is opposite to the support When the positioning of 210 is adjusted, the waveguide sheet 230 can be positioned and installed on the bracket 210 through the colloid 221 in the receiving structure 220, so that the center of the light projected by the projection module 10 roughly falls on the waveguide sheet 230. the center of the coupling region 232 .

It should be noted that the colloid 221 in the receiving structure 220 may be arranged on both sides corresponding to the glue area 233 of the waveguide sheet 230 (see FIG. 12 ), and the colloid 221 on each side is located between the waveguide sheet 230 and the inner wall of the receiving structure 220 In yet another embodiment, the colloid 221 may be arranged on one side relative to the glue area 233 of the waveguide sheet 230 (see FIG. 21 ), and the colloid 221 arranged on one side is located between the waveguide sheet 230 and the inner wall of the receiving structure 220 . It will be understood that arranging the glue 221 on both sides (ie, double-sided painting glue) can effectively balance the effect of the deformation caused by the curing of the glue on the waveguide sheet 230 .

In order to facilitate glue injection, a plurality of glue injection holes 211 are provided at positions corresponding to the receiving structure 220 of the bracket 210 and the glue drawing area 233 of the waveguide sheet 230. When glue is drawn, the glue can be injected from the plurality of glue injection holes 211 to the receiving structure. 220 and contact with the drawing glue area 233, and then expose and cure the glue. In the case of arranging the colloids 221 on both sides, the main support 210b of the support 210 (which is located on the outcoupling side of the waveguide sheet 230 ) and the sub-support 210a (which is located on the opposite side of the outcoupling side of the waveguide sheet 230 ) may correspond respectively to A front glue injection hole 211b and a rear glue injection hole 211a are provided.

Optionally, a protrusion (not shown in the figure) is provided on the inner wall of the receiving structure 220, and the protrusion protrudes toward the waveguide sheet 230, and its shape may be but not limited to zigzag, rectangle, triangle, etc.; the protrusion may be used to increase the The surface area of the colloid 221 in contact with the inner wall of the receiving structure 220 increases the adhesive force.

Optionally, the inner wall of the receiving structure 220 is provided with a glue overflow groove 212 (see FIG. 12 ), the glue overflow groove 212 can be used to accommodate excess glue, and the edge of the bracket can also have a glue overflow prevention structure; the glue overflow groove 212 Specifically, it may be disposed at the corner of the inner wall of the receiving structure 220 . The edge of the bracket 210 may further be provided with an anti-overflow glue structure to prevent the glue before curing from overflowing and contaminating the optical area of the waveguide sheet 230 .

Referring to FIG. 12 , the receiving structure 220 may be a cavity structure surrounded by the main support 210b and the auxiliary support 210a, and each waveguide sheet 230 is positioned and installed in one receiving structure 220 between the main support 210b and the auxiliary support 210a; receiving The width of the structure 220 in the x-direction is greater than the thickness of the waveguide sheet 230. For example, the width of the receiving structure 220 can be set so that when the waveguide sheet 230 is received and fixed, there is a single gap between the waveguide sheet 230 and the inner wall of the receiving structure 220. The side gap 223 is in the range of 0.25 mm or more and 1 mm or less (eg, 0.5 mm, 0.8 mm, etc.); thus, the positioning of the waveguide sheet 230 in the receiving structure 220 before the waveguide sheet 230 is fixed to the receiving structure 220 It can be adjusted online, that is to say, the receiving structure 220 provides a redundant space for adjusting the positioning of the waveguide sheet 230 relative to the bracket 210 .

Optionally, the bracket 210 may be a split bracket, wherein the main bracket 210b and the sub bracket 210a are detachably and fixedly connected together to form the receiving structure 220. For example, the main bracket 210b and the sub bracket 210a may be fixedly connected to the receiving structure 220 by screws. Together. In other embodiments, the main bracket 210b and the sub bracket 210a may be bonded together by glue or the like to form the receiving structure 220 . Of course, in other embodiments, the bracket 210 can also be an integrated bracket.

In the case where the projection module 10 is positioned and installed on the support plate 213 and the display chip 1130 or the projection lens 13 needs to be actively adjusted (that is, the case where the active adjustment is performed on the main bracket 210 b ), considering that the receiving camera 91 To receive the request of the projected image of the projection module 10, before actively adjusting the display chip 1130 or the projection lens 13, the sub bracket 210a is not installed on the main bracket 210b, so as to prevent the sub bracket 210a from blocking the projection module 10 in its light exit. The extension direction is convenient to use the receiving camera 91 for active adjustment. After actively adjusting the display chip 1130 or the projection lens 13 on the main bracket 210b, the sub bracket 210a can be fixed on the main bracket 210b by screws or glue.

In other embodiments, the sub-support 210a may be fixedly disposed relative to the main support 210b in a positioning manner that avoids the coupling region 232 of the waveguide sheet 230 (not shown in the figure), so that the sub-support 210a will not substantially block the projection. The extension direction of the light output of the module 10 facilitates the active adjustment of the projection module 10 on the main bracket 210b.

It should be noted that, the positioning of the waveguide sheet 230 relative to the projection module 10 can be actively adjusted and determined before it is cured by the colloid 221 . The positioning of the waveguide sheet 230 relative to the projection module 10 will be described in the following assembly method illustrated in FIG. 23 .

14 to 18 illustrate a near-eye display device 300 according to a second embodiment of the present invention and a waveguide sheet 230 used therefor. The main difference between the near-eye display device 300 of the second embodiment and the near-eye display device 200 of the first embodiment is that the projection module 10 is positioned and installed on the bracket 210 substantially parallel to the coupling region 232 of the waveguide sheet 230 . , a refractive prism 340 is arranged between the projection module 10 and the coupling region 232 of the waveguide sheet 230 , and the refractive prism 340 is positioned and installed relative to the bracket 230 so that the center of the light projected by the projection module 10 falls after being refracted by the prism 340 At the center of the coupling region 232 of the waveguide sheet 230 .

Specifically, referring to FIGS. 14 to 18 , the projection modules 10 on the left and right sides are arranged opposite to each other along the Y axis, and the light projected by each projection module 10 is refracted by a refractive prism 340 and enters the coupling region 232 of the waveguide sheet 230 . , the projection module 10 and the bracket 210 can be pre-connected through the step bearing surface on the support plate 213, the limit structure such as the limit hole 1232, and then the glue is drawn in the glue groove 1231 and exposed, and the relative positions of the two are fixed ( See Figure 17). The refractive prism 340 and the bracket 210 can be pre-connected by limiting structures such as limiting posts 341, and then glue is drawn in the glue drawing groove 342 and exposed to fix their relative positions (see FIG. 17).

19 to 21 illustrate a near-eye display device 400 according to a third embodiment of the present invention. The main difference between the near-eye display device 400 of the third embodiment and the near-eye display device 200 of the first embodiment is that the bracket 210 does not include a bracket located outside the waveguide sheet 230 , that is, the bracket shown in FIG. 11 is omitted. The receiving structure 220 may be a semi-open cavity structure formed by the integrated support 210; the colloid 221 may be arranged on one side relative to the glue area 233 of the waveguide sheet 230 (see FIG. 21 ), one side The ground-arranged colloid 221 is located between the waveguide sheet 230 and the inner wall of the receiving structure 220 .

FIG. 22 is a schematic structural diagram of a near-eye display device according to a fourth embodiment of the present invention. The main difference between the near-eye display device 500 of the fourth embodiment and the near-eye display device 200 of the first embodiment is that the bracket 210 has an escape port 213 at a position corresponding to the coupling region 232 of the waveguide sheet 230 , and the escape port 213 It is used to avoid the light projected by the projection module 10). In this way, the sub-bracket 210 a basically does not block the extending direction of the projection module 10 in the light exiting direction, which facilitates the active adjustment of the projection module 10 on the bracket 210 . The escape ports 213 may be specifically arranged on the left and right sides of the sub-support 210a.

The following describes an assembling method of a near-eye display device according to an embodiment of the present invention with reference to the near-eye display device 200 of the first embodiment and FIG. 23 .

First, in step S2301, the projection module 10 is positioned and installed on the bracket 210;

In step S2302 , the positioning of the waveguide sheet 230 relative to the bracket 210 is adjusted until the center of the light projected by the projection module 10 falls on the center of the coupling region 232 of the waveguide sheet 230 .

Specifically, first insert the waveguide sheet 230 into the receiving structure 220 of the support 210, there is a gap between the waveguide sheet 230 and the support 210, the interval can be used to fine-tune the waveguide sheet 230, and the unilateral gap value is 0.25mm-1mm, For example, 0.55mm; it should be noted that if the gap is too small, the reserved adjustment space will be insufficient, causing interference between the waveguide sheet 230 and the bracket 210, and if the gap is too large, the colloid will be too much, making the colloid difficult to cure , The shrinkage of the colloid during curing is relatively large, which is easy to cause a decrease in reliability.

Since the angle between the incident light and the surface of the waveguide sheet 230 when the incident light is coupled in will affect the transmission efficiency of the waveguide sheet 230, and an inappropriate coupling angle will also cause distortion of the finally observed image, further real-time active calibration of the waveguide sheet 230 to Get the best image quality. It will be understood that since the grating engraving of the waveguide sheet 230 is prone to errors, the active calibration of the waveguide sheet 230 can also compensate for the influence of this part of the error on the output image. In addition, by actively calibrating the relative positions of the waveguide sheet 230 and the projection module 10, the center of the light of the projection module just falls on the center of the coupling region 232 of the waveguide sheet, which ensures the undistorted projection image and reduces the light energy. loss.

During the active calibration process, a specific image projected by the projection module 10 can be received by the receiving device (for example, the receiving camera 91 ) provided on the side of the human eye, and the waveguide sheet 230 can be positioned on the X-axis, Y-axis, Z-axis in real time by means of an external positioning system The axis, XOY plane, YOX plane, and XOZ plane are actively adjusted in the six degrees of freedom directions, and the optimal installation position of the waveguide sheet 230 can be determined by recognizing the received images.

In one embodiment, the distance between the receiving device and the waveguide sheet 230 can simulate the distance between the human eye and the waveguide sheet 230, for example, 1 cm-2 cm, and the projection module 10 can project a predetermined image such as a cross-hair image. The position of the received cross line is adjusted on the XOZ plane and the YOX plane. Specifically, a standard cross pattern can be set on the camera lens of the receiving device, and by judging the projection module 10 received by the receiving device. The positional relationship between the cross line and the standard cross pattern is used to determine the direction and/or size of the waveguide sheet 230 that needs to be adjusted; through the light and dark test of the image, the position of the waveguide sheet is adjusted on the X-axis, the Y-axis, and the X-axis to ensure the best brightness. uniformity. It will be understood that the cross pattern used in this method is only an exemplary pattern, for example, the cross pattern can be replaced with other patterns such as dot matrix; in addition to automatic active calibration using software, using a more intuitive cross pattern is also convenient for manual calibration. , when the adjustment range exceeds the upper limit set by the software, it can also be manually calibrated manually to reduce the defective rate of the product.

Optionally, the bracket 210 may be provided with marking points, which are used to directly position and install the waveguide sheet 230 relative to the bracket 210 through machine vision technology; The position of the waveguide sheet 230 is adjusted on the plane, and further, the relative positions of the waveguide sheet 230 and the projection module 10 can also be aligned directly using the identification of the marking points.

It should be noted that the active adjustment process of the waveguide sheets 230 in the above example can be repeated for each waveguide sheet 230, although the waveguide sheets 230 may obtain different positioning results.

Step S2303, fixing the waveguide sheet 230 relative to the bracket 210 under the adjusted positioning.

Under the adjusted positioning, the position of the waveguide sheet 230 is determined, and glue is injected into the glue drawing area 233 of the waveguide sheet 230 through the glue injection holes 211 on both sides of the bracket 210, and the exposure is performed through the glue injection holes 211. and curing the colloid 211 , so that the waveguide sheet 230 is fixed relative to the bracket 210 .

In the assembly method of the above example, the relative positions of the waveguide sheet 230 and the projection module 10 can be adjusted in the five-degree-of-freedom direction by means of active calibration. After the image is identified, the relative position of the waveguide sheet 230 and the projection module 10 can be accurately determined; moreover, it can be fixed by gluing and exposure, and few mechanical structural parts are used, the assembly tolerance of the near-eye display device is low, and the assembly process is low. simpler. As a result, the assembling method of the above example obtains a near-eye display device and can provide images of high imaging quality.

While the invention has been described in conjunction with one or more implementations, substitutions and/or modifications may be made to the illustrated examples without departing from the spirit or scope of the appended claims. Furthermore, although a specific feature of the invention is disclosed in connection with only one of several implementations/embodiments, this feature may be combined with other implementations/embodiments as desired and advantageous for any given or specific function one or more of the other features in combination.

Claims

A projection module (10) comprising a projection display device (11) and a projection lens (13), the projection display device (11) comprising an illumination assembly (111) and a display module (1130) with a display chip (1130). 113), characterized in that it further comprises a rigid structural member (121), the light converting element (1112) of the lighting assembly (111) is fixedly mounted on the rigid structural member (121), and the display module (113) is connected to the There are gaps between the rigid structural members (121).
The projection module (10) according to claim 1, wherein a connection medium is provided in the gap, and the connection medium fixes the display module (113) on the rigid structural member (121) .
The projection module (10) according to claim 1 or 2, wherein a first window (124) is opened on one side of the rigid structural member (121), and the display module (113) is fixed on the Corresponding to the opening of the first opening (124), and the display module (113) and the light converting element (1112) are respectively located on both sides of the first opening (124).
The projection module (10) according to any one of claims 1 to 3, wherein the gap is in the range of 0.05 mm or more and 1 mm or less, or further in the range of 0.1 mm or more and less than or equal to 1 mm. is equal to the range of 0.6mm.
The projection module (10) according to any one of claims 1 to 4, wherein the gap is configured to: determine the positioning of the display chip (1130) relative to the lighting assembly (111), So that the image projection image output by the projection lens (13) under the determined positioning meets the predetermined requirements.
5. The projection module according to claim 5, wherein the projection image conforming to the predetermined requirement comprises: the imaging definition of the projected image conforms to the corresponding predetermined requirement, and the brightness uniformity of the projected image conforms to the corresponding predetermined requirement. The requirements, and the virtual image of the projected image meet corresponding predetermined requirements; or further comprise: the projected image can enter the human eye in a substantially horizontal or substantially vertical orientation.
The projection module (10) according to any one of claims 2 to 6, wherein the display module (113) is fixed to the rigid structural member (121) through a solidified connection medium in the gap ), so that the display chip (1130) is fixed in the projection module (10) based on the determined positioning.
The projection module (10) according to any one of claims 1 to 7, wherein the lighting assembly (111) comprises a light source module (1110);

Wherein, the light diverting element (1112) is used for at least partially diverting the light emitted by the light source module (1110) to the display chip (1130) and/or returning the light from the display chip (1130). At least partially turning to the projection lens (13) of the projection module (10).
The projection module (10) of any one of claims 3 to 8, wherein the first fenestration (124) is configured to enable the display module (113) to be removed from the rigid structure The outer side of the piece (121) is positioned and installed at the opening corresponding to the first opening (124).
The projection module (10) according to any one of claims 3 to 9, wherein the display module (113) comprises a substrate (1131) for attaching the display chip (1130);

Wherein, between the edge portion of the substrate (1131) and the step (1212) corresponding to the first opening (124) for supporting and positioning the substrate (1131), there is provided for the display module (113) A connecting medium fixed on the rigid structural member (121).
The projection module (10) of any one of claims 2 to 10, wherein the connecting medium is configured to seal the gap.
The projection module according to any one of claims 2 to 11, characterized in that, the connecting medium has an uneven thickness arrangement, so that the display module (113) is relatively opposite to the rigid structure (113). 121) Inclined positioning.
The projection module (10) according to any one of claims 1 to 12, wherein the projection module (10) further comprises a support plate (123);

Wherein, the support plate (123) is provided with a drawing glue groove (1231) and a limit structure (1232), and the drawing glue groove (1231) is provided with a connection for fixing and installing the rigid structural member (121) A medium, wherein the limiting structure (1232) is disposed corresponding to the rigid structural member (121) and used to limit the mounting of the rigid structural member (121) on the support plate (123).
The projection module (10) according to any one of claims 3 to 13, wherein the outer wall of the rigid structural member (121) is further provided with a second opening facing the light source module (1110). a window (126) and a third fenestration (127) towards the projection lens (13);

Wherein, the projection lens (13) is positioned and installed on the third opening window (127), so that the projection lens (13) is positioned and installed relative to the projection display device (11).
The projection module (10) according to claim 14, characterized in that, under the condition that the positioning of the projection lens (13) relative to the rigid structural member (121) is adjusted, the desired thickness arrangement and The projection lens (13) is positioned and installed on the third opening (127) with a connecting medium of/or shape.
A near-eye display device (200), characterized by comprising: a waveguide sheet (230), the projection module (10) according to any one of claims 1 to 15, and a bracket (210);

Wherein, the waveguide sheet (230) and the projection module (10) are positioned and installed on the bracket (210) so that the center of the light projected by the projection module (10) falls on the waveguide The center of the coupling region (232) of the sheet (230).
A method for assembling a projection module, comprising the steps of:

assembling the lighting assembly (111) of the projection module (10), wherein the light converting element (1112) of the lighting assembly (111) is fixedly mounted on the rigid structural member (121);

A display module (113) with a display chip (1130) is arranged at a preset position of the projection module (10), so that the gap between the display module (113) and the rigid structural member (121) is leave an initial gap;

On the basis of the preset position, the positioning of the display module (113) relative to the lighting assembly (111) is adjusted until the projected image output by the projection lens (13) of the projection module (10) conforms to the predetermined requirements, accordingly, the initial gap is adjusted and determined to be the adjusted gap; and

The display module (113) is fixed relative to the lighting assembly (111) under the adjusted position.
The assembling method according to claim 17, characterized in that, in the adjusting step, the positioning of the display chip (1130) relative to the assembled lighting assembly (111) is calibrated in an active manner, or The positioning of the display chip (1130) relative to the assembled lighting assembly (111) is adjusted using machine vision technology.
The assembling method according to claim 17 or 18, characterized in that, that the projected image meets the predetermined requirements comprises: the imaging definition of the projected image meets the corresponding predetermined requirements, and the brightness uniformity of the projected image meets the corresponding predetermined requirements. The predetermined requirement and the virtual image distance of the projected image meet the corresponding predetermined requirement; or the projected image can enter the human eye in a substantially horizontal or substantially vertical orientation.
The assembling method according to any one of claims 17 to 19, wherein the preset position is located outside the rigid structural member (121);

In the adjusting step, the positioning of the display module (113) with the display chip (1130) relative to the rigid structural member (121) is adjusted from the outside of the rigid structural member (121), thereby adjusting Correct the positioning of the display chip (1130) relative to the lighting assembly (111).
The assembly method according to any one of claims 17 to 20, wherein the adjustment comprises one or more of the following:

adjusting the inclination angle of the display module (113) relative to the rigid structural member (121) until the imaging clarity of the projection image output by the projection lens (13) of the projection module (10) meets corresponding predetermined requirements;

The display module (113) is translated relative to the rigid structural member (121) in an xoy plane, until the brightness uniformity of the projected image meets corresponding predetermined requirements, wherein the xoy plane is based on a perpendicular direction from the the direction of the light emitted by the light converting element (1112) of the lighting assembly (111) toward the display chip (1130);

Translate the display module (113) relative to the rigid structural member (121) along the z direction until the virtual image distance of the projected image meets corresponding predetermined requirements, wherein the z direction is from the lighting assembly (111) The direction of the light rays emitted by the light converting element (1112) to the display chip (1130);

The display module (113) is rotated relative to the rigid structural member (121) on the xoy plane until the projected image can enter the human eye in a substantially horizontal or substantially vertical orientation.
The assembling method according to any one of claims 17 to 21, characterized in that, in the fixing step, the substrate (1131) to which the display chip (1130) is attached is relative to the lighting assembly (1131) through a connection medium. 111) is fixed with the rigid structural member (121) on which the light converting element (1112) is installed.
The assembling method according to any one of claims 17 to 22, characterized in that, in the adjusting step, by adjusting the position of the display chip (1130) relative to the assembled lighting assembly (111) positioning, to adjust and determine the initial gap between the display module (113) and the rigid structural member (121) to obtain the adjusted gap; wherein, the connection medium is placed in the adjusted gap gap.