Display optical engine and head-mounted display device

Abstract

The present invention discloses a display optical engine and a head-mounted display device, relating to the technical field of head-mounted display devices. Among them, the display optical engine includes a display module, a fixed lens, a movable lens, and a driving member. The display module has a display area. The fixed lens is disposed corresponding to the display area and is relatively fixed to the display module. The movable lens is disposed corresponding to the display area and can move relative to the display module. The driving member is used to drive the movable lens to move. At least one of the fixed lens and the movable lens is a convex lens. The technical solution provided by the present invention aims to ensure the miniaturization of the head-mounted display device, thereby ensuring the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of head-mounted display devices, and particularly to a display optical engine and a head-mounted display device. Background Art

[0002] When users with vision problems use head-mounted display devices such as virtual reality head-mounted devices, augmented reality head-mounted devices, and mixed reality head-mounted devices, they need to rely on vision correction clips to make the diopter of the lens module match the user's vision condition. However, adding vision correction clips will increase the volume of the device and affect the user experience. Summary of the Invention

[0003] The main object of the present invention is to provide a display optical engine and a head-mounted display device, aiming to ensure the miniaturization of the head-mounted display device and thus ensure the user experience.

[0004] To achieve the above object, the display optical engine proposed by the present invention includes:

[0005] A display module having a display area;

[0006] A fixed lens corresponding to the display area and fixedly arranged relative to the display module;

[0007] A movable lens corresponding to the display area and movable relative to the display module; and

[0008] A driving member for driving the movable lens to move;

[0009] Wherein, at least one of the fixed lens and the movable lens is a convex lens.

[0010] In one embodiment, the display optical engine further includes a fixed bracket and a movable bracket. The fixed lens is installed on the fixed bracket, the movable lens is installed on the movable bracket, the movable bracket and the fixed bracket are rotatably and axially movably connected, and the driving member is configured as a knob and is fixedly arranged relative to the movable bracket.

[0011] In one embodiment, the movable bracket is connected to the fixed bracket by a threaded connection.

[0012] In one embodiment, the movable bracket is further installed with a plano lens.

[0013] In one embodiment, one end of the movable bracket is inserted into the fixed bracket, the driving member is sleeved on the other end of the movable bracket and sleeved on the outer peripheral side of the fixed bracket, and a positioning and matching structure is provided between the driving member and the fixed bracket.

[0014] In one embodiment, between the inner peripheral side of the driving member and the outer peripheral side of the fixed bracket, a positioning straight groove extending axially is provided on one of them, and a positioning convex portion is protruded on the other. At least one of the positioning straight groove and the positioning convex portion is circumferentially distributed with a plurality of them, and one positioning convex portion is correspondingly engaged with one positioning straight groove.

[0015] In one embodiment, the driving member has an elastic portion, and the positioning convex portion is provided on the elastic portion.

[0016] In one embodiment, corresponding to one elastic portion, the driving member is provided with two through grooves extending axially, and the through grooves penetrate through the end side of the driving member facing the display area, and the elastic portion is formed between the two through grooves.

[0017] In one embodiment, a plurality of the positioning straight grooves are circumferentially and evenly spaced on the outer peripheral side of the fixed bracket, and two positioning convex portions are oppositely arranged radially on the inner peripheral side of the driving member.

[0018] In one embodiment, a fixing convex portion is protruded on the outer periphery of the movable bracket, and the driving member is correspondingly provided with a mounting groove, and the fixing convex portion is fixed in the mounting groove.

[0019] The present invention also provides a head-mounted display device, including the aforementioned display optical engine.

[0020] In the technical solution of the present invention, at least one of the fixed lens and the movable lens is set as a convex lens, which can converge the light emitted from the display area downstream of the optical path of the display area, facilitating the human eye to receive the outgoing light of the display optical engine. The present invention can drive the movable lens to move relative to the display module through the driving member. Since the fixed lens and the display module are relatively fixed, the movable lens can also move relative to the fixed lens, thereby changing the diopter of the lens group composed of the fixed lens and the movable lens. Therefore, by adjusting the distance between the movable lens and the fixed lens, the diopter of the lens group can be changed to match the vision condition of the user. Without increasing the volume of the device, the requirements of users with different vision conditions for diopter can be met, which is beneficial to ensuring the miniaturization of the head-mounted display device and further ensuring the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0022] Figure 1Schematic structural diagram of an embodiment of the display optical engine provided by the present invention;

[0023] Figure 2 is Figure 1 Cross-sectional view of the display optical engine in [reference] along the A-A direction;

[0024] Figure 3 is Figure 1 Cross-sectional view of the display optical engine in [reference] along the B-B direction;

[0025] Figure 4 Exploded structural diagram of an embodiment of the display optical engine provided by the present invention;

[0026] Figure 5 Schematic structural diagram of an embodiment of the driving member of the display optical engine provided by the present invention.

[0027] Explanation of the reference numerals in the drawings:

[0028] 100, display module; 110, display area;

[0029] 210, fixed lens; 220, fixed bracket; 221, positioning straight groove;

[0030] 310, movable lens; 320, movable bracket; 321, fixed convex part; 330, plano-convex lens;

[0031] 400, driving member; 410, elastic part; 411, positioning convex part; 420, through groove; 430, avoidance opening; 440, mounting groove.

[0032] The realization, functional features and advantages of the objectives of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The present invention provides a display optical engine. Among them, the display optical engine can be a VR (Virtual Reality) display optical engine or an AR (Augmented Reality) display optical engine.

[0037] Please refer to Figures 1 to 4 , in an embodiment of the present invention, the display optical engine includes:

[0038] A display module 100 having a display area 110;

[0039] A fixed lens 210 disposed corresponding to the display area 110 and relatively fixed to the display module 100;

[0040] A movable lens 310 disposed corresponding to the display area 110 and movable relative to the display module 100; and

[0041] A driving member 400 for driving the movable lens 310 to move;

[0042] Among them, at least one of the fixed lens 210 and the movable lens 310 is a convex lens.

[0043] In the technical solution of the present invention, at least one of the fixed lens 210 and the movable lens 310 is set as a convex lens, which can converge the light emitted from the display area 110 downstream of the optical path of the display area 110, facilitating the human eye to receive the outgoing light of the display optical engine. The present invention can drive the movable lens 310 to move relative to the display module 100 through the driving member 400. Since the fixed lens 210 and the display module 100 are relatively fixed, the movable lens 310 can also move relative to the fixed lens 210, thereby changing the diopter of the lens group composed of the fixed lens 210 and the movable lens 310. Therefore, by adjusting the distance between the movable lens 310 and the fixed lens 210, the diopter of the lens group can be changed to match the user's vision condition. Without increasing the volume of the device, the requirements for diopter of users with different vision conditions can be met, which is beneficial to ensuring the miniaturization of the head-mounted display device and further ensuring the user experience.

[0044] Without loss of generality, one or more fixed lenses 210 and movable lenses 310 can be provided. Taking the case where one fixed lens 210 and one movable lens 310 are provided as an example, the diopter of the lens group formed by the fixed lens 210 and the movable lens 310 and the diopter of the fixed lens 210 , the diopter of the movable lens 310 , and the distance between the fixed lens 210 and the movable lens 310 satisfy the following relationship:

[0045]

[0046] If both the fixed lens 210 and the movable lens 310 are convex lenses, their diopters are both positive. Taking the matched by a user with normal vision as a reference, increasing the distance will cause to decrease, adapting to myopic people; decreasing the distance will cause to increase, adapting to hyperopic people.

[0047] If one of the fixed lens 210 and the movable lens 310 is a convex lens and the other is a concave lens, their diopters are one positive and one negative, and the product of their diopters is negative. Taking the matched by a user with normal vision as a reference, increasing the distance will cause to increase, adapting to hyperopic people; decreasing the distance will cause . To decrease, adapting to myopic people.

[0048] In an embodiment, please refer to Figures 1 to 4, the display optical engine further includes a fixed bracket 220 and a movable bracket 320. The fixed lens 210 is mounted on the fixed bracket 220, and the movable lens 310 is mounted on the movable bracket 320. The movable bracket 320 and the fixed bracket 220 are rotatably and axially movably connected. The driving member 400 is configured as a knob and is relatively fixed to the movable bracket 320. In this way, the driving member 400 can drive the movable bracket 320 to rotate and axially move relative to the fixed bracket 220, changing the distance between the fixed lens 210 and the movable lens 310, thereby adjusting the diopter of the lens group formed by the two to adapt to the user's vision condition. Specifically, by rotating the driving member 400, while driving the movable bracket 320 to rotate relative to the fixed bracket 220, the movable bracket 320 can axially move relative to the fixed bracket 220, thereby changing the axial distance between the fixed lens 210 and the movable lens 310. Of course, in other embodiments, it may also be that both the fixed lens 210 and the movable lens 310 are mounted on the same bracket, and the driving member 400 directly drives the movable lens 310 to axially move.

[0049] In one embodiment, please refer to Figures 2 to 4 , the movable bracket 320 is connected to the fixed bracket 220 by a threaded connection. In this way, the driving member 400 can rotate the movable bracket 320 to change the axial distance between the fixed lens 210 and the movable lens 310. Specifically, by driving the driving member 400 to drive the movable bracket 320 to rotate in the direction close to the display area 110, the axial distance between the fixed lens 210 and the movable lens 310 will be reduced. By driving the driving member 400 to drive the movable bracket 320 to rotate in the direction away from the display area 110, the axial distance between the fixed lens 210 and the movable lens 310 will be increased. Of course, in other embodiments, it may also be that one of the movable bracket 320 and the fixed bracket 220 is provided with a sliding convex portion, and the other is provided with a circumferentially extending and axially inclined chute. Through the cooperation of the sliding convex portion and the chute, when the driving member 400 drives the movable bracket 320 to rotate, the movable bracket 320 can axially move relative to the fixed bracket 220 at the same time.

[0050] Without loss of generality, please refer to Figures 2 to 4 , the fixed bracket 220 is provided with an internal thread portion on the side of the fixed lens 210 facing away from the display module, and the movable bracket 320 is correspondingly provided with an external thread portion. The movable bracket 320 extends into the fixed bracket 220 and is connected by the external thread portion and the internal thread portion. Of course, it may also be that the fixed bracket 220 is provided with an internal thread and the movable bracket 320 is provided with an external thread.

[0051] In one embodiment, please refer to Figures 1 to 4, one end of the movable bracket 320 is inserted into the fixed bracket 220, the driving member 400 is sleeved on the other end of the movable bracket 320 and sleeved on the outer peripheral side of the fixed bracket 220, and a positioning and matching structure is provided between the driving member 400 and the fixed bracket 220. In this way, when the driving member 400 is rotated, the driving member 400 can be positioned and matched with the fixed bracket 220 at different rotation angles, that is, a plurality of adjustment gears can be formed to facilitate the user's adjustment. After the adjustment is in place, the movable bracket 320 and the driving member 400 can also be maintained at the current gear through this positioning and matching structure, so as to ensure the adjustment reliability of the driving member 400.

[0052] In one embodiment, please refer to Figures 1 to 5 , between the inner peripheral side of the driving member 400 and the outer peripheral side of the fixed bracket 220, one is provided with a positioning straight groove 221 extending axially, and the other is convexly provided with a positioning convex portion 411. At least one of the positioning straight groove 221 and the positioning convex portion 411 is distributed with a plurality along the circumferential direction, and one positioning convex portion 411 is correspondingly engaged with one positioning straight groove 221. Taking the positioning straight groove 221 being provided with a plurality as an example, when the driving member 400 is rotated, since the movable bracket 320 will rotate and axially move relative to the fixed bracket 220 at the same time, after the positioning convex portion 411 slides from one positioning straight groove 221 into another positioning straight groove 221, the axial position of the positioning convex portion 411 relative to the positioning straight groove 221 can also change, ensuring that the driving member 400 can shift gears for the movable bracket 320. When the position of the movable bracket 320 is adjusted in place, the positioning convex portion 411 can be engaged with the current positioning straight groove 221, so that the movable bracket 320 can be stably in the current position. In addition, when the user rotates the driving member 400, the positioning convex portion 411 sliding into or out of the positioning straight groove 221 can give the user a certain tactile feedback, enabling the user to adjust conveniently and reliably. Of course, in other embodiments, it may also be to provide a plurality of spaced magnetic attraction portions, and the gear shift is realized by switching the cooperation of the magnetic attraction portions.

[0053] Specifically, please refer to Figures 3 to 5 , a plurality of the positioning straight grooves 221 are evenly spaced along the circumferential direction on the outer peripheral side of the fixed bracket 220, and two positioning convex portions 411 are oppositely arranged along the radial direction on the inner peripheral side of the driving member 400. In this way, at each gear position, there can be two positioning convex portions 411 and the positioning straight grooves 221 cooperating to play a positioning role, which can enhance the tactile feedback effect and improve the positioning reliability.

[0054] In one embodiment, please refer to Figures 3 to 5The driving member 400 has an elastic portion 410, and the positioning protrusion 411 is provided on the elastic portion 410. In this way, after the positioning protrusion 411 slides out of the positioning straight groove 221, the elastic portion 410 can be deformed to reduce the pressing force between the positioning protrusion 411 and the peripheral wall of the fixing bracket 220 outside the positioning straight groove 221, thereby reducing the friction that needs to be overcome when the driving member 400 rotates relative to the fixing bracket 220, allowing the user to rotate the driving member 400 more effortlessly and conveniently. After the positioning protrusion 411 slides back into the positioning straight groove 221, the elastic portion 410 can restore its deformation and maintain this state, so that the positioning protrusion 411 can be stably engaged with the positioning straight groove 221. Of course, in other embodiments, an arc groove can also be provided between adjacent positioning straight grooves 221 to guide and cooperate with the positioning protrusion 411.

[0055] In one embodiment, see Figures 3 to 5 , corresponding to one of the elastic parts 410, the driving member 400 is provided with two through slots 420 extending in the axial direction, and the through slot 420 passes through the end side of the driving member 400 facing the display area 110, and the elastic part 410 is formed between the two through slots 420. That is, by providing two through slots 420, the wall between the two through slots 420 has the ability to deform, thereby forming an elastic part 410 similar to an elastic snap-fit structure. The positioning protrusion 411 is arranged near the end side through which the through slot 420 passes, and the elastic part 410 here has a greater deformation ability, so that the user can rotate the driving member 400 more effortlessly. Of course, in other embodiments, the positioning protrusion 411 and the inner peripheral wall of the driving member 400 may also be connected by a spring, and the spring is also the elastic part 410.

[0056] In one embodiment, see Figure 2 、 Figure 4 and Figure 5 The movable bracket 320 is provided with a fixed protrusion 321 on its outer periphery, and the driving member 400 is provided with a corresponding mounting groove 440, in which the fixed protrusion 321 is fixed. In this way, the movable bracket 320 and the driving member 400 are fixedly connected. The mounting groove 440 has a notch on the side facing the display module 100 to facilitate the engagement of the fixed protrusion 321 with the mounting groove 440. The fixed protrusion 321 can be fixed in the mounting groove 440 by means of glue injection or by means of wedge-type engagement. Of course, in other embodiments, the driving member 400 and the movable bracket 320 can also be fixed by screws.

[0057] In one embodiment, see Figures 1 to 4, a plano-convex lens 330 is further installed on the movable bracket 320. The plano-convex lens 330 can be used to fold the optical path, making the optical path more compact, which is beneficial to improving the miniaturization of the display optical engine. Moreover, it can also help correct certain types of aberrations, reduce chromatic aberration or other optical distortions, and improve the overall image quality. Specifically, the driving member 400 is provided with an avoidance opening 430. The plano-convex lens 330 is installed at the port of the movable bracket 320 away from the fixed bracket 220 and is located at the position of the avoidance opening 430. In this way, while protecting the lens group through the plano-convex lens 330, the plano-convex lens 330 will not block the optical path, that is, it will not affect the light emission of the display optical engine.

[0058] The present invention also provides a head-mounted display device, which includes a display optical engine. The specific structure of the display optical engine refers to the above embodiments. Since this head-mounted display device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0059] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A display optical engine, characterized in that, Comprising: A display module having a display area; A fixed lens, disposed corresponding to the display area and relatively fixed to the display module; A movable lens, disposed corresponding to the display area and movable relative to the display module; And A driving member for driving the movable lens to move; Wherein at least one of the fixed lens and the movable lens is a convex lens; The display optical engine further includes a fixed bracket and a movable bracket. The fixed lens is mounted on the fixed bracket, the movable lens is mounted on the movable bracket, the movable bracket and the fixed bracket are axially movably connected, and the driving member is configured as a knob and is relatively fixed to the movable bracket; The movable bracket is connected to the fixed bracket by means of a threaded connection; One end of the movable bracket is inserted into the fixed bracket, the driving member is sleeved on the other end of the movable bracket, and is sleeved on the outer peripheral side of the fixed bracket; Between the inner peripheral side of the driving member and the outer peripheral side of the fixed bracket, one is provided with a positioning straight groove extending axially, and the other is convexly provided with a positioning convex portion. At least one of the positioning straight groove and the positioning convex portion is circumferentially distributed with a plurality of them, and one positioning convex portion is correspondingly engaged with one positioning straight groove; When the driving member is rotated, the positioning convex portion can slide from one positioning straight groove to another positioning straight groove.

2. The display optical engine according to claim 1, wherein The movable bracket is further mounted with a plano lens.

3. The display optical machine according to claim 1, wherein The driving member has an elastic portion, and the positioning convex portion is provided on the elastic portion.

4. The display optical engine according to claim 3, characterized in that, Corresponding to one elastic portion, the driving member is provided with two axially extending through grooves, and the through grooves penetrate through the end side of the driving member facing the display area, and the elastic portion is formed between the two through grooves.

5. The display optical engine according to claim 1, characterized in that A plurality of the positioning straight grooves are circumferentially and evenly spaced on the outer peripheral side of the fixed bracket, and two positioning convex portions are radially oppositely arranged on the inner peripheral side of the driving member.

6. The display optical engine according to claim 1, wherein, The outer periphery of the movable bracket is convexly provided with a fixing convex portion, the driving member is correspondingly provided with a mounting groove, and the fixing convex portion is fixed in the mounting groove.

7. A head-mounted display device, characterized in that, Including the display optical engine according to any one of claims 1 to 6.

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