Display device

Abstract

The display device includes an optical engine, the optical engine including a lens assembly and a display assembly, the display assembly including a display, the lens assembly including a lens set, a lens barrel having a positioning groove, a focus ring fitted onto the outside of the lens barrel, and a holder, the lens barrel being fitted onto the outside of the holder, the holder including a convex portion housed in the positioning groove and connected to the focus ring, and when focusing, the lens set does not move, the focus ring drives the holder to move linearly, and the holder drives the display to move linearly relative to the lens set.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to display devices.

Background Art

[0002] As the demand for improving display technologies in consumer electronics products is increasing, attention has been focused on virtual reality / augmented reality display technologies. Virtual Reality (VR) has a better sense of immersion and is being supported by consumers. VR devices generally include two symmetrically installed VR optical engines. To reduce the size of the VR device, the display of the VR optical engine is generally close to the human eye, so it is necessary to install optical elements (such as lenses) between the display and the human eye. Through the refraction or reflection of the optical elements, the image of the display generates an enlarged image in the distance and shows the enlarged image to the human eye, thereby realizing an immersive visual field.

[0003] To accommodate users with different eyesights, the position of the display is generally fixed, and the adjustment of the focal length (zoom) is realized by adjusting the distance between the optical elements or the distance between the light source element and the display. In the method of adjusting the focal length in this way, since the position of the optical display element changes, the overall optical length of the VR optical engine becomes longer, which is disadvantageous for the miniaturization of the VR device.

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a common cathode is formed by full-surface evaporation, a short circuit occurs between the common cathode and the anode of the micro LED, which causes a failure of the device.

Means for Solving the Problems

[0005] Therefore, the present invention provides a display device that is advantageous for miniaturization.

[0006] To solve the above problems, the present invention provides the following technical means.

[0007] A display device including two symmetrically arranged optical engines, each of the optical engines including a lens assembly and a display assembly, the display assembly including a display, Each of the lens assemblies includes A lens set facing the display, A lens barrel including at least one positioning groove for accommodating the lens set, A focus ring externally fitted on the outside of the lens barrel, A holder for fixing the display, the lens barrel being externally fitted on the outside of the holder, the holder including at least one convex portion, one of the convex portions being accommodated in one of the positioning grooves and connected to the focus ring, and a holder. During focusing, the lens set does not move, the focus ring drives the holder to linearly move relative to the lens set within the lens barrel, and the holder drives the display to linearly move relative to the lens set within the lens barrel. A display device.

[0008] In any embodiment of the present invention, the convex portion has a first male thread, the focus ring has a female thread, and the first male thread is screwed into the female thread.

[0009] In any embodiment of the present invention, the shape of the cross-section of the display facing the lens set is a centrally symmetric polygon.

[0010] In any embodiment of the present invention, the display includes an array substrate and a bonding terminal electrically connected to the array substrate. The array substrate includes a first surface facing the lens set, a second surface facing away from one of the first surfaces, and a side surface connecting at least one of the first surfaces and the second surfaces. The bonding terminal is formed on the side surface or the second surface.

[0011] In any embodiment of the present invention, the display assembly further includes a COF (Chip On Film), a driver integrated circuit, and a flexible circuit board. The COF is electrically connected to the bonding terminal and the flexible circuit board. The driver integrated circuit is formed on the COF. The orthographic projections of the flexible circuit board and the driver integrated circuit on the display are both on the display or outside the display.

[0012] In any embodiment of the present invention, the length of the positioning groove is greater than the length of the convex portion, the width of the positioning groove is smaller than the width of the convex portion, the length direction of the positioning groove is the moving direction of the display, and the width direction of the positioning groove is perpendicular to the length of the positioning groove.

[0013] In any embodiment of the present invention, the holder has a first opening and a first accommodating groove communicating with the first opening. The display is accommodated in the first accommodating groove, and a part of the display is exposed from the first opening. The display assembly further includes a cover plate located on the side of the display away from the first opening. The cover plate is a centrally symmetric polygon. The size of the cover plate is larger than the size of the display. The cover plate is fixed to the support member.

[0014] In any embodiment of the present invention, the cover plate has a second opening, and a part of the COF or the flexible circuit board protrudes from the second opening.

[0015] In any embodiment of the present invention, the outer wall of the holder has an annular second accommodating groove, a part of the lens barrel is accommodated in the second accommodating groove, and the positioning groove communicates with the second accommodating groove.

[0016] In any embodiment of the present invention, the lens assembly further includes a clamping ring, the clamping ring is fixed to one end of the lens barrel away from the display, the clamping ring partially covers the lens set and has one light transmission hole, and a part of the lens set is exposed from the light transmission hole.

[0017] In any embodiment of the present invention, the display device further includes a support body portion, the support body portion has a first storage groove and a second storage groove installed adjacent to each other, and the two optical engines are respectively accommodated in the first storage groove and the second storage groove.

[0018] In any embodiment of the present invention, the display device further includes an interpupillary distance adjustment portion, the interpupillary distance adjustment portion and the optical engine are both installed on the support body portion, the interpupillary distance adjustment portion is respectively connected to the two optical engines, and the two optical engines can be linearly moved in opposite directions or in opposite directions in the first storage groove and the second storage groove respectively.

[0019] In any embodiment of the present invention, the lens barrel includes a first positioning portion, the first positioning portion is close to the display and away from the holder body portion. When the focus ring drives the display to the farthest position from the lens set, one end of the focus ring hits the first positioning portion.

[0020] In any embodiment of the present invention, the clamping ring includes a second positioning portion, the second positioning portion faces the focus ring. When the focus ring drives the display to the closest position to the lens set, one end of the focus ring hits the second positioning portion.

Advantages of the Invention

[0021] In the display device of the present invention, a holder for supporting a display is installed inside the lens barrel. The holder includes at least one of the convex portions, and at least one positioning groove is provided at a position corresponding to the convex portion of the lens barrel. One of the convex portions protrudes from within one of the positioning grooves and is connected to the focus ring. When focusing, the lens set does not move, and the focus ring drives the convex portion to linearly move with respect to the lens set within the positioning groove. The convex portion drives the holder to linearly move with respect to the lens set within the lens barrel, and the holder drives the display to linearly move with respect to the lens set within the lens barrel. In this way, the holder drives the display to linearly move within the lens barrel, eliminating the need to increase the size of the lens assembly (particularly the lens barrel) of the optical engine, which is advantageous for miniaturizing the display device.

Brief Description of the Drawings

[0022] To more clearly explain the technical means in the embodiments of the present invention, the drawings necessary for use in the description of the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0023]

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Embodiments for Carrying Out the Invention

[0024] Hereinafter, the technical means in the embodiments of the present invention will be clearly and completely described with reference to the drawings related to the embodiments of the present invention. The following embodiments are only a part of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts are included in the protection scope of the present invention.

[0025] In the description of the present application, the directions or positional relationships indicated by terms such as "upper" and "lower" are based on the directions or positional relationships shown in the drawings, and are merely for facilitating the description of the present application and simplifying the description, and do not indicate or imply that the shown device or component must have a specific direction and be configured and operate in a specific direction. Therefore, it should not be understood as limiting the present application. Also, the terms "first" and "second" are for the purpose of description only, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features limited by "first" and "second" may explicitly or implicitly include one or more of the above features. In the description of the present application, "a plurality" means two or more unless there is a clear and specific limitation.

[0026] In different examples of the present application, reference numerals and / or reference alphabets can be repeatedly used. Such repetition is for the purpose of simplification and clarification and does not itself indicate the relationship between various embodiments and / or installations under consideration.

[0027] Hereinafter, the display device of the present invention will be described in detail with reference to specific examples.

[0028] Referring to FIG. 1, a preferred embodiment of the present invention provides a display device 100, the display device 100 includes a support main body part 110, two symmetrically installed optical engines 120, and an interpupillary distance adjustment part (not shown), and the interpupillary distance adjustment part and the optical engine 120 are both installed on the support main body part 110. Specifically, the support main body part 110 has a first storage groove 1101 and a second storage groove 1102 installed adjacent to each other, the two optical engines 120 are respectively accommodated in the first storage groove 1101 and the second storage groove 1102, the interpupillary distance adjustment part is respectively connected to the two optical engines 120, and can linearly move the two optical engines 120 in opposite directions or in opposite directions in the first storage groove 1101 and the second storage groove 1102 respectively.

[0029] Specifically, referring to FIG. 2, each of the optical engines 120 includes a display assembly 1201 and a lens assembly 1202, and the display assembly 1201 is fixed within the lens assembly 1202.

[0030] Specifically, referring to FIGS. 2 to 11, the display assembly 1201 includes a display 11, a COF (Chip On Film) 12, a flexible circuit board 13, and a driver integrated circuit 14. The flexible circuit board 13 is electrically connected to the display 11 via the COF 12, and the driver integrated circuit 14 is formed on and electrically connected to the COF 12. The display 11 further includes an array substrate 103, a color filter substrate 104, and liquid crystal (not shown). The array substrate 103 is disposed opposite to the color filter substrate 104, and the liquid crystal is located between the array substrate 103 and the color filter substrate 104. The array substrate 103 includes a first surface 113 facing one of the color filter substrates 104, a second surface 114 facing away from one of the first surfaces 113, and side surfaces 111 connecting at least one of the first surface 113 and the second surface 114. The color filter substrate 104 faces the first surface 113. The display 11 further includes bonding terminals 112, which are formed on and electrically connected to the side surfaces 111 or the second surface 114 of the array substrate 103, and the COF 12 is electrically connected to the bonding terminals 112 and the flexible circuit board 13.

[0031] The orthographic projections of the flexible circuit board 13 and the driver integrated circuit 14 on the display 11 are both on the display 11 or outside the display 11.

[0032] The display 11 further includes a backplane 105, which is formed on the surface of the array substrate 103 away from the color filter substrate 104.

[0033] Specifically, referring to FIG. 3, in any embodiment of the present invention, the bonding terminal 112 is formed on the side surface 111 of the array substrate 103. One end of a part of the COF 12 is electrically connected to the bonding terminal 112, and the other end is bent and extends to the side away from the color filter substrate 104 of the display 11. Specifically, the orthographic projection of a part of the COF 12 on the display 11 is all on the surface of the backplane 105 away from the array substrate 103, and the orthographic projections of the driver integrated circuit 14 and the flexible circuit board 13 on the display 11 are both on the surface of the backplane 105 away from the array substrate 103.

[0034] Specifically, referring to FIG. 4, in another arbitrary embodiment of the present invention, the bonding terminal 112 is formed on the first surface 113 of the array substrate 103 and is located at one end of the color filter substrate 104. One end of a part of the COF 12 is electrically connected to the bonding terminal 112, and the other end is bent and extends to the side away from the color filter substrate 104 of the display 11. Specifically, the orthographic projection of a part of the COF 12 on the display 11 is all on the surface of the backplane 105 away from the array substrate 103, and the orthographic projections of the driver integrated circuit 14 and the flexible circuit board 13 on the display 11 are both on the surface of the backplane 105 away from the array substrate 103. Further, the display 11 may further include a light-shielding layer 106, the light-shielding layer 106 is formed on the surface of the color filter substrate 104 away from the array substrate 103, the light-shielding layer 106 has a third opening 1061, and a part of the color filter substrate 104 is exposed from the third opening 1061.

[0035] Specifically, referring to FIG. 5, in yet another optional embodiment of the present invention, the bonding terminal 112 is formed on the second surface 114 of the array substrate 103 and is located at one end of the backplane 105. One end of some of the COF 12 is electrically connected to the bonding terminal 112, and the other end is bent and extends to the side away from the color filter substrate 104 of the display 11. Specifically, the orthographic projection of some of the COF 12 on the display 11 is all on the surface of the backplane 105 away from the array substrate 103, and the orthographic projection of the driver integrated circuit 14 and the flexible circuit board 13 on the display 11 is both on the surface of the backplane 105 away from the array substrate 103.

[0036] Specifically, referring to FIG. 6, in yet another optional embodiment of the present invention, the bonding terminal 112 is formed on the second surface 114 of the array substrate 103 and is located at one end of the backplane 105. One end of some of the COF 12 is electrically connected to the bonding terminal 112, and the other end is bent and extends in a direction away from the backplane 105. Specifically, the orthographic projection of some of the COF 12 on the display 11 is all outside the display 11, and the orthographic projection of the driver integrated circuit 14 and the flexible circuit board 13 on the display 11 is both outside the display 11.

[0037] Referring to FIGS. 7 and 8, the shape of the cross-section of the display 11 in a direction perpendicular to the stacking direction of the array substrate 103 and the color film substrate 104 is a centrally symmetric polygon, that is, the shape of the projection of the display 11 on a holder 20 (described later) is a centrally symmetric polygon. For example, a hexagon, an octagon, a dodecagon, etc. Specifically, the display 11 includes a display area 101 and a non-display area 102 surrounding the display area 101. The shape of the display area 101 is generally circular, and the edge portion of the non-display area 102 away from the display area 101 is a centrally symmetric polygon such as a hexagon, an octagon, a dodecagon, etc. Since the field of view of the optical engine 120 is circular, correspondingly, the effective utilization area (display area) of the display is circular. By designing the appearance of the display 11 as a centrally symmetric polygon (for example, a hexagon or an octagon, etc.), the size of the display can be reduced. Furthermore, by reducing the size of the display, the appearance of the display 11 is designed as a centrally symmetric polygon (for example, a hexagon or an octagon, etc.), so that the display can be utilized to the maximum extent.

[0038] Referring again to FIGS. 2, 9 to 12, each lens assembly 1202 includes a holder 20, a lens barrel 30, a focus ring 40, a clamping ring 50, a cover plate 60, and a lens set 70. The focus ring 40 is externally fitted on the outside of the lens barrel 30. The lens barrel 30 is externally fitted on the outside of the holder 20. The clamping ring 50 is fixed to one end of the lens barrel 30. The lens set 70 is fixed to one end of the lens barrel 30 and is close to the clamping ring 50. The cover plate 60 is fixed to one end of the holder 20 away from the lens set 70. The display 11 is placed at one end of the holder 20 away from the lens set 70 and is fixed between the cover plate 60 and the holder 20 by the cover plate 60.

[0039] The holder 20 includes a holder main body portion 21, a first support portion 22, a second support portion 23, and a plurality of convex portions 24. The first support portion 22 and the second support portion 23 form a support member. The holder main body portion 21 is annular, the first support portion 22 is in the shape of a hollow sheet, the first support portion 22 is fixed to one end of the holder main body portion 21, the second support portion 23 is fixed to the surface of the first support portion 22 away from the holder main body portion 21, the first support portion 22 has a first opening 221, and between the first support portion 22 and the second support portion 23, a first accommodation groove 231 communicating with the first opening 221 is arranged in a surrounding manner, and the display 11 is accommodated in the first accommodation groove 231. A part of the display 11 is exposed from the first opening 221. The cover plate 60 is located on the side of the display 11 away from the first opening 221 so as to fix the display 11 in the first accommodation groove 231, and is fixed to the second support portion 23.

[0040] Specifically, referring to FIG. 9, in this embodiment, the appearance of the cover plate 60 is also a polygon with central symmetry, and the dimensions of the cover plate 60 are larger than those of the display 11.

[0041] One end of the first support portion 22 away from the first opening 221 protrudes from the holder main body portion 21. The convex portion 24 is fixed to one end of the holder main body portion 21 away from the first support portion 22 and is formed on the outer wall facing the focus ring 40 of the holder main body portion 21. The convex portion 24 and the portion of the first support portion 22 protruding from the holder main body portion 21 form an annular second accommodation groove 211, and a part of the lens barrel 30 is accommodated in the second accommodation groove 211.

[0042] A first male thread 241 is formed on the outer wall of the convex portion 24 facing the focus ring 40.

[0043] The lens barrel 30 includes a lens barrel main body 31, a first positioning portion 32, and a stepped portion 33. The stepped portion 33 and the first positioning portion 32 are respectively fixed to opposite ends of the lens barrel main body 31. The stepped portion 33 is close to the lens set 70, and the first positioning portion 32 is close to the display 11 and away from the holder main body portion 21. The focus ring 40 is externally fitted to the lens barrel main body 31 and can move linearly along the extending direction of the lens barrel main body 31. The moving range of the focus ring 40 is limited by the first positioning portion 32 and the tightening ring 50.

[0044] At least one positioning groove 311 is provided in the lens barrel main body 31. One convex portion 24 is accommodated in one positioning groove 311 and connected to the focus ring 40. The focus ring 40 can drive the holder 20 to move linearly within the lens barrel 30, and the holder 20 can drive the display 11 to move linearly within the lens barrel 30. The length of the positioning groove 311 is greater than the length of the convex portion 24 so as to drive and guide the convex portion 24 to move along the length direction of the positioning groove 311 within the positioning groove 311 in accordance with the focus ring 40 and under the drive of the focus ring 40. The width of the positioning groove 311 is smaller than the width of the convex portion 24 to limit the rotation between the holder 20 and the lens barrel 30. The length direction of the positioning groove 311 is the moving direction of the display 11, and the width direction of the positioning groove 311 is perpendicular to the length of the positioning groove 311.

[0045] One third accommodation groove 312 is provided in the lens barrel main body 31. The first support portion 22 is accommodated in the third accommodation groove 312, and the third accommodation groove 312 is further used to limit the moving range of the display 11 within the lens barrel 30.

[0046] The stepped portion 33 includes a first sub-stepped portion 331 and a second sub-stepped portion 332. The second sub-stepped portion 332 is fixed so as to be vertically connected to the first sub-stepped portion 331. The first sub-stepped portion 331 is fixed so as to be vertically connected to one end of the lens barrel main body portion 31 away from the display 11. The lens set 70 is accommodated in a cavity formed from the second sub-stepped portion 332 and fixed to the inner wall of the second sub-stepped portion 332.

[0047] Specifically, referring to FIGS. 2 and 10, the inner wall of the focus ring 40 facing the lens barrel 30 has a female thread 41, and the first male thread 241 is screwed into the female thread 41. In this way, when the focus ring 40 is rotated, the focus ring 40 drives the convex portion 24 to linearly move within the positioning groove 311, the convex portion 24 drives the holder 20 to linearly move within the lens barrel 30, and the holder 20 drives the display 11 to linearly move within the lens barrel 30. The positioning groove 311 is used to limit the linear movement distance of the display 11 within the lens barrel 30, that is, the positioning groove 311 is used to limit the focus adjustment range of the optical engine 120.

[0048] The tightening ring 50 is fixed to one end of the lens barrel 30 away from the display 11. The tightening ring 50 includes a tightening ring main body portion 51, a contact portion 52, and a second positioning portion 53. The contact portion 52 is fixed to the first sub-step portion 331, and the contact portion 52 is annular. The tightening ring main body portion 51 and the second positioning portion 53 are respectively fixed to one end of the contact portion 52 away from the first sub-step portion 331. The tightening ring main body portion 51 partially covers the lens set 70. The tightening ring main body portion 51 has a light transmission hole 54, and a part of the lens set 70 is exposed from the light transmission hole 54. The second positioning portion 53 faces the focus ring 40. When the focus ring 40 drives the display 11 to the closest position to the lens set 70, one end of the focus ring 40 hits the second positioning portion 53. When the focus ring 40 drives the display 11 to the farthest position from the lens set 70, one end of the focus ring 40 hits the first positioning portion 32.

[0049] The cover plate 60 further has a second opening 61, and a part of the COF 12 or the flexible circuit board 13 protrudes from the second opening 61.

[0050] The lens set 70 includes at least one lens, and the lens is fixed to the inner wall of the second sub-step portion 332 of the lens barrel 30 away from the focus ring 40. The display 11 faces the lens set 70. Specifically, the color filter substrate 104 faces the lens set 70.

[0051] Referring to FIG. 12, when the diopter of the optical engine 120 is 0D, the display 11 is away from the lens set 70.

[0052] Referring to FIG. 13, when the diopter of the optical engine 120 is not 0D (for example, -5D or -8D, etc.), the display 11 approaches the lens set 70.

[0053] In the display device of the present invention, a holder for supporting a display is installed inside the lens barrel. The holder includes at least one of the convex portions. At least one positioning groove is provided at a position corresponding to the convex portion of the lens barrel. One of the convex portions protrudes from within one of the positioning grooves and is connected to the focus ring. When focusing, the lens set does not move, and the focus ring drives the convex portion to linearly move within the positioning groove with respect to the lens set. The convex portion drives the holder to linearly move within the lens barrel with respect to the lens set, and the holder drives the display to linearly move within the lens barrel with respect to the lens set. In this way, the holder drives the display to linearly move within the lens barrel, eliminating the need to increase the size of the lens assembly (especially the lens barrel) of the optical engine. Not only can focusing be realized, but it is also advantageous for miniaturization of the display device.

[0054] Also, since the field of view of the optical engine is circular, correspondingly, the effective utilization area (display area) of the display is circular. By designing the appearance of the display as a centrally symmetric polygon (such as a hexagon or an octagon, etc.), the size of the display can be reduced. Furthermore, due to the reduction in the size of the display, by designing the appearance of the display as a centrally symmetric polygon (such as a hexagon or an octagon, etc.), the display can be utilized to the maximum extent.

[0055] Also, by forming the COF and the driver integrated circuit on the side surface or the back surface of the display (array substrate), the bezel width of the display panel can be reduced, so that the screen-to-body ratio can be increased, the size of the display assembly can be reduced, which is advantageous for miniaturization of the display device.

[0056] In addition, by interlocking the holder of the present application with the lens barrel and the focus ring, the focusing structure can be simplified, the fixing and moving of the display become easy, the lifespan of the flexible circuit board of the display assembly is improved, and the noise during the adjustment of the focal length and the pupil distance is reduced.

[0057] In addition, in the present invention, compared with the prior art method of focusing by moving the lens set, the method of focusing by moving the display of the present invention can not only ensure that the visual field of the optical engine remains unchanged, but also reduce the overall optical length of the optical engine by 10% - 15%.

[0058] As described above, the present invention has disclosed preferred embodiments. However, the above-described preferred embodiments do not limit the present invention. Those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is based on the scope defined in the claims.

Explanation of Reference Numerals

[0059] 100: Display device 110: Support main body part 1101: First storage groove 1102: Second storage groove 120: Optical engine 1201: Display assembly 1202: Lens assembly 11: Display 12: COF 13: Flexible circuit board 14: Driver integrated circuit 101: Display area 102: Non-display area 103: Array substrate 104: Color filter substrate 105: Backplane 106: Light-shielding layer 1061: Third opening 111: Side surface 112: Bonding terminal 113: First surface 114: Second surface 20: Holder 21: Holder main body part 211: Second accommodation groove 22: First support part 221: First opening 23: Second support part 231: First accommodation groove 24: Protrusion 241: First male thread 30: Lens barrel 31: Lens barrel main body part 311: Positioning groove 312: Third accommodation groove 32: First positioning part 33: Step part 331: First sub-step part 332: Second sub-step part 40: Focus ring 41: Female thread 50: Clamping ring 51: Clamping ring main body part 52: Contact part 53: Second positioning part 54: Light transmission hole 60: Cover plate 61: Second opening 70: Lens set

Claims

1. A display device including two symmetrically mounted optical engines, each of the optical engines including a lens assembly and a display assembly, the display assembly including a display; Each of the lens assemblies comprises: a set of lenses facing the display; and a lens barrel including at least one positioning groove and configured to accommodate the lens set; a focus ring fitted onto the outside of the lens barrel; a holder to which the display is fixed, the lens barrel being fitted onto the outside of the holder, the holder including at least one protrusion, one of the protrusions being accommodated in one of the positioning grooves and connected to the focus ring; A display device in which, when focusing, the lens set does not move, the focus ring drives the holder to move linearly relative to the lens set within the lens barrel, and the holder drives the display to move linearly relative to the lens set within the lens barrel.

2. The display device according to claim 1 , wherein the protrusion has a first male thread, the focus ring has a female thread, and the first male thread is screwed into the female thread.

3. The display device according to claim 1 , wherein the cross section of the display facing the lens set has a shape of a centrally symmetric polygon.

4. 2. The display device of claim 1, wherein the display includes an array substrate and a bonding terminal electrically connected to the array substrate, the array substrate includes a first surface facing the lens set, a second surface opposite to the first surface, and at least one side surface connecting the first surface and the second surface, and the bonding terminal is formed on the side surface or the second surface.

5. The display device of claim 4 , wherein the display assembly further comprises a COF, a driver integrated circuit, and a flexible circuit board, the COF being electrically connected to the bonding terminals and the flexible circuit board, and the driver integrated circuit being formed on the COF.

6. The display device of claim 5 , wherein orthogonal projections of the flexible circuit board and the driver integrated circuit on the display are both on the display.

7. The display device of claim 5 , wherein orthogonal projections of the flexible circuit board and the driver integrated circuit on the display are both outside the display.

8. The display device according to claim 1 , wherein the length of the positioning groove is greater than the length of the protrusion, and the length direction of the positioning groove is the movement direction of the display.

9. The display device according to claim 8 , wherein a width of the positioning groove is smaller than a width of the protrusion, and a width direction of the positioning groove is perpendicular to a length of the positioning groove.

10. The display device according to claim 5, wherein the holder has a first opening and a first accommodating groove communicating with the first opening, the display is accommodated in the first accommodating groove, and a portion of the display is exposed from the first opening.

11. The display device of claim 10 , wherein the display assembly further includes a cover plate located on a side of the display away from the first opening, the cover plate being secured to the holder.

12. The display device of claim 11 , wherein the dimensions of the cover plate are greater than the dimensions of the display.

13. The display device of claim 11 , wherein the cover plate is a centrally symmetric polygon.

14. The display device of claim 11 , wherein the cover plate has a second opening, and a portion of the COF or the flexible circuit board protrudes from the second opening.

15. The display device according to claim 1 , further comprising an annular second accommodating groove on an outer wall of the holder, a part of the lens barrel being accommodated in the second accommodating groove, and the positioning groove communicating with the second accommodating groove.

16. 2. The display device of claim 1, wherein the lens assembly further includes a clamping ring fixed to an end of the lens barrel away from the display, the clamping ring partially covering the lens set and having one light-transmitting hole, and a portion of the lens set is exposed from the light-transmitting hole.

17. 2. The display device according to claim 1, further comprising a support body having a first storage groove and a second storage groove arranged adjacent to each other, and the two optical engines are accommodated in the first storage groove and the second storage groove, respectively.

18. 18. The display device of claim 17, further comprising a pupil distance adjustment unit, the pupil distance adjustment unit and the optical engine are both installed on the support body, the pupil distance adjustment unit is connected to the two optical engines, and the two optical engines can be linearly moved in opposite directions or in opposite directions within the first storage groove and the second storage groove, respectively.

19. The lens barrel includes a first positioning portion, the first positioning portion being close to the display and away from a holder body portion of the holder; The display device according to claim 1 , wherein one end of the focus ring abuts on the first positioning portion when the focus ring drives the display to the farthest position from the lens set.

20. the clamping ring includes a second positioning portion, the second positioning portion facing the focus ring; The display device according to claim 16 , wherein one end of the focus ring abuts on the second positioning portion when the focus ring drives the display to a position closest to the lens set.

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