CN218886315U

CN218886315U - Optical module and head-mounted display equipment

Info

Publication number: CN218886315U
Application number: CN202222519502.8U
Authority: CN
Inventors: 刘德安
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2023-04-18
Anticipated expiration: 2032-09-22

Abstract

The utility model discloses an optical module and a head-mounted display device; the optical module comprises a first display screen, a second display screen, a beam combiner and a lens assembly; the first display screen is used for emitting first light rays, the second display screen is used for emitting second light rays, and the second light rays and the first light rays form a first set included angle; the beam combining mirror is arranged on the propagation paths of at least part of the first light and the second light, and is configured to emit the second light along the first direction in a reflection mode and emit at least part of the first light along the first direction in a transmission mode; the lens assembly is arranged opposite to the first display screen in the first direction, is positioned on the light path of the first light and the second light emitted by the beam combining mirror, and is used for imaging after the first light and the second light are superposed. The utility model discloses a higher angular resolution of optical module utensil can improve user's visual experience and feel, especially can not feel obvious granular sensation when people's eye watches the image.

Description

Optical module and head-mounted display equipment

Technical Field

The utility model relates to a nearly eye shows technical field, more specifically, the utility model relates to an optical module and wear display device.

Background

Existing Virtual Reality (VR) devices typically need to have a large Field of View (FOV) in order to enable a user to get a good sense of immersion in use. The larger the FOV the more the immersive experience can be increased. At present, the field angle of the virtual reality device is distributed around 100 degrees.

The resolution is embodied as PPD (pixel per degree) in the virtual reality device, that is, the number of pixels contained in each 1 ° included angle in the field angle FOV, which is also called angular resolution. Since the resolution of the display screen is fixed, the angular resolution PPD is smaller when the field angle FOV is larger. At present, most of virtual reality devices have an angular resolution PPD of about 30, and the human eyes can feel obvious graininess when watching a display screen. The two parameters, field angle FOV and angular resolution PPD, may conflict in the design of the virtual reality device. That is, for VR devices, trying to maintain a large field angle FOV results in a small angular resolution PPD, and the user cannot obtain a higher resolution image while performing the immersion experience.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pair of optical module and new technical scheme who wears display device.

In a first aspect, an embodiment of the present invention provides an optical module. The optical module includes:

the first display screen is used for emitting first light rays;

the second display screen is used for emitting second light rays, and the second light rays and the first light rays form a first set included angle;

the beam combining mirror is arranged on the propagation paths of at least part of the first light and the second light, and is configured to emit the second light in a first direction in a reflection mode and emit at least part of the first light in the first direction in a transmission mode;

the lens assembly is arranged opposite to the first display screen in the first direction, is positioned on the light path of the first light and the second light emitted by the beam combining mirror, and is used for imaging after the first light and the second light are superposed.

Optionally, the first direction is parallel to an optical axis of the lens assembly.

Optionally, the second display screen and the beam combiner are both located between the first display screen and the lens assembly, the beam combiner and the second display screen form a second set included angle, and the second light enters the beam combiner and enters the lens assembly after being reflected by the beam combiner.

Optionally, the second set included angle is B, where B satisfies: b is more than 0 degree and less than 90 degrees.

Optionally, the second display screen reaches the beam combiner is located between the first display screen and the lens subassembly, the second display screen is the level setting, the beam combiner for the second display screen is the slope setting and forms the second and sets for the contained angle, the second sets for the contained angle and is 45 degrees.

Optionally, the first set included angle is a, and a satisfies: a is more than 0 degree and less than or equal to 90 degrees.

Optionally, the beam combiner is further located on a light path of the first light emitted from the middle area of the first display screen;

the first light rays emitted from the middle area of the first display screen penetrate through the beam combining mirror and then enter the lens assembly, and the first light rays emitted from the edge area of the first display screen directly enter the lens assembly.

Optionally, the resolution of the first display screen is greater than the resolution of the second display screen, and the size of the first display screen is greater than the size of the second display screen.

Optionally, the beam combiner is a half-reflecting and half-transmitting mirror.

Optionally, the field angle of the optical module is greater than or equal to 100 °, and the angular resolution PPD of the optical module is greater than 60 °.

Optionally, the lens assembly comprises at least one lens configured to reflect the first and second light rays multiple times to form a folded light path.

In a second aspect, an embodiment of the present invention provides a head-mounted display device. The head mounted display device includes:

a housing; and

the optical module is disposed in the housing.

The beneficial effects of the utility model reside in that:

the embodiment of the utility model provides an optical module belongs to near-to-eye display optical system, through increase a display screen (second display screen promptly) and beam combiner in whole light path, can image together the light that the display screen (first display screen promptly) that itself has jetted out and the display screen that increases jets out in the optical module in the people's eye to can reach the effect that improves optical module angular resolution. The design can improve the visual experience when the user uses the optical module. Particularly, no noticeable graininess is perceived when viewing an image formed by the optical module.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

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

Fig. 1 is a schematic structural diagram of an optical module according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating the principle of angular resolution enhancement of an optical module according to an embodiment of the present invention.

Description of reference numerals:

10. a first display screen; 20. a second display screen; 30. a beam combining mirror; 40. a lens assembly; 01. the human eye; 02. a first light ray; 03. the second light ray.

Detailed Description

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

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

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The optical module and the head-mounted display device provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

According to the utility model discloses an embodiment provides an optical module, optical module is a near-to-eye display optical system, for example can be in wearing display device like the VR equipment in multiple form, including VR intelligent glasses or VR helmet etc..

The optical module of the embodiment of the present invention, as shown in fig. 1, includes a first display screen 10, a second display screen 20, a beam combiner 30 and a lens assembly 40;

the first display screen 10 is used for emitting a first light 02; the second display screen 20 is configured to emit a second light ray 03, and the second light ray 03 and the first light ray 02 form a first set included angle;

the beam combining mirror 30 is disposed on a propagation path of at least a portion of the first light 02 and the second light 03, and the beam combining mirror 30 is configured to reflect the second light 03 in a first direction and transmit at least a portion of the first light 02 in the first direction;

the lens assembly 40 is disposed opposite to the first display screen 10 in the first direction, is located on the light path of the first light 02 and the second light 03 emitted from the beam combiner 30, and is configured to superimpose the first light 02 and the second light 03 for imaging.

The utility model discloses in the optical module, through increase a display screen (introducing second display screen 20 promptly) and at least one beam combiner 30 in whole light path, can image the light of the display screen (being first display screen 10) outgoing that itself has in the optical module and the light of the display screen outgoing that increases together in people's eye 01 to can reach the effect that improves optical module angular resolution. The design can improve the visual experience when the user uses the optical module. Particularly, no noticeable graininess is perceived when viewing an image formed by the optical module.

In the embodiment of the present invention, in the optical module, the first display screen 10 and the second display screen 20 are respectively used for emitting the light of the image, so as to form two kinds of imaging light, and the lens assembly 40 is designed to be located on the propagation path of each imaging light. The lens assembly 40 can amplify both the first light 02 emitted from the first display screen 10 and the second light 03 emitted from the second display screen 20, and finally, the first light 02 and the second light 03 are uniformly emitted into human eyes 01 to realize imaging, so that an image finally viewed by a user is actually a target display image.

The target display image is a virtual image formed by the first light ray 02 and the second light ray 03 together, so that the number of display pixels included in the target display image can be increased. That is, the number of display pixels included in the target display image is the sum of the display pixels T0 of the first display panel 10 and the display pixels T1 of the second display panel 20, as shown in fig. 2. Compared with the optical scheme of a single display screen only comprising a plurality of display pixels T0 in the traditional scheme, the scheme has the advantages that the number of the display pixels in the formed target display image is obviously increased, and the imaging quality is favorably improved.

The utility model discloses in the optical module, the beam combining mirror 30 not only can transmit the part first light 02 can also reflect simultaneously second light 03 makes first light 02 reaches second light 03 can close the light to make a large amount of light can get into lens subassembly 40, this resolution ratio that does benefit to the promotion formation of image to do benefit to the angular resolution who promotes whole optical module.

It should be noted that the first display screen 10 can be designed as a main display screen in the whole optical module, for example, and can be used for emitting the main imaging light (i.e. the first light 02); the second display screen 20 may be a secondary display screen (or a secondary display screen) in the whole optical module, and the second light 03 emitted by the second display screen is mainly used for matching with the first light 02 emitted by the first display screen 10 to increase the number of display pixels of the finally formed target display image, as shown in fig. 2.

The utility model discloses optical module, it belongs to near-to-eye display optical module, can be in for example VR equipment. The lens assembly 40 may be designed to have a folded optical path structure, for example, which is advantageous for reducing the size and weight of the optical module. Inside optical module was applied to head mounted display device, just can reduce head mounted display device's size and alleviate head mounted display device's weight, travelling comfort when can improve the user and wear head mounted display device.

In some examples of the present invention, referring to fig. 1, the first direction is parallel to an optical axis of the lens assembly 40.

In the optical module according to the embodiment of the present invention, the lens assembly 40 includes at least one lens, and each lens in the lens assembly 40 should be designed to be located on the same optical axis. The beam combiner 30 can be configured to combine the first light beam 02 and the second light beam 03 and then inject the combined light beam into the lens assembly 40, and in order to make the first light beam 02 and the second light beam 03 smoothly enter the lens assembly 40 as much as possible, the first direction is designed to be parallel to the optical axis.

In addition, it should be noted that the first display screen 10 and the lens assembly 40 are located on the same optical axis.

In some examples of the present invention, the second display screen 20 reaches the beam combining mirror 30 is located between the first display screen 10 and the lens assembly 40, the beam combining mirror 30 forms the second setting included angle with the second display screen 20, the second light 03 enters the beam combining mirror 30, through the beam combining mirror 30 reflects into the lens assembly 40.

In the embodiment of the present invention, the first display screen 10 can be a display screen that the optical module itself has, and is used for emitting imaging light, and the lens assembly 40 is used for imaging, and is designed to be located on one side of the first display screen 10, and has a set interval between the lens assemblies 40. Thus, a certain accommodation space is formed between the lens assembly 40 and the first display screen 10.

The light scheme of the present invention utilizes the above-mentioned accommodating space. Specifically, the second display screen 20 and the beam combiner 30 are arranged between the first display screen 10 and the lens assembly 40 by using the interval therebetween, so that the arrangement of the optical elements in the optical module is reasonable, and the transverse size of the optical module is not too large.

Meanwhile, in the layout manner in the above example, only one beam combiner 30 can be used to match two display screens (i.e., the first display screen 10 and the second display screen 20), so that the light beams respectively emitted from the two display screens can smoothly go into the lens assembly 40 on one side. Therefore, display pixels contained in the two display screens can be overlapped during imaging, and the purpose of improving the resolution is achieved. That is, the layout method in the above example can introduce fewer optical elements into the optical module, but can achieve a very good effect of increasing the angular resolution of the optical module.

In the above example, the second set angle is B, and B satisfies: b is more than 0 degree and less than 90 degrees.

It should be noted that the second set included angle B is an included angle formed by the beam combiner 30 and the second display screen 20, as described in the above example. In fact, it is only necessary that the second light 03 emitted from the second display panel 20 can be emitted into the beam combining mirror 30 as much as possible, and the beam combining mirror 30 can reflect the second light 03 to the lens assembly 40. When the second set included angle B formed by the beam combiner 30 and the second display screen 20 is set to any degree of the above-mentioned 0-90 degrees, the above-mentioned technical effect can be achieved.

Preferably, the second set included angle B formed by the beam combiner 30 and the second display screen 20 is set to 45 degrees, so that the beam combiner 30 and the second display screen 20 occupy a smaller space when being arranged, which does not result in an excessively large space between the first display screen 10 and the lens assembly 40, which is advantageous for reducing the size of the optical module in the optical axis direction. Moreover, in the preferred embodiment, the second light 03 emitted from the second display screen 20 can be incident on the beam combiner 30 as much as possible, which is beneficial to increase the second light 03 entering the lens assembly 40, which is beneficial for the final imaging.

In a specific example of the present invention, referring to fig. 1, the second display screen 20 and the beam combiner 30 are located between the first display screen 10 and the lens assembly 40, the second display screen 20 is horizontally disposed, the beam combiner 30 is inclined to the second display screen 20 to form a second set included angle, and the second set included angle is 45 degrees.

In the layout manner shown in the above specific example, the second display panel 20 has less shielding effect on the first display panel 10, so that the first light 02 emitted from the first display panel 10 can enter the lens assembly 40 as much as possible. Moreover, the layout mode is simple, the inclination angle of the beam combiner 30 is easy to adjust, the beam combiner 30 is also easy to arrange, the production and the processing of the optical module are facilitated, and the assembly difficulty of the optical module can be reduced.

In some examples of the present invention, the first setting angle is a, and a satisfies: a is more than 0 degree and less than or equal to 90 degrees.

The first set included angle a is an included angle formed between the second light ray 03 and the first light ray 02. Since the second light 03 is emitted by the second display screen 20, and the first light 02 is emitted by the first display screen 10, the first set included angle a can also be understood as an included angle formed by the first display screen 10 and the second display screen 20.

In the embodiment of the present invention, the first light 02 emitted from the first display screen 10 and the second light 03 emitted from the second display screen 20 need to be combined at the beam combining mirror 30, and therefore, the two should be able to intersect, so that a certain inclination angle should be provided between the two.

When the first set angle formed between the second light ray 03 and the first light ray 02 is within the range of the above example, it can be ensured that the first light ray 02 and the second light ray 03 are well combined at the beam combiner 30 and then enter the lens assembly 40 for amplification, and finally, a target display image is formed in the human eye 01. The target display image includes display pixels of the first display screen 10 and display pixels of the second display screen 20.

In some examples of the present invention, the beam combiner 30 is further located on the light path of the first light 02 emitted from the middle region of the first display screen 10; the first light 02 emitted from the middle region of the first display screen 10 penetrates through the beam combining mirror 30 and then enters the lens assembly 40, and the first light 02 emitted from the edge region of the first display screen 10 directly enters the lens assembly 40.

Wherein, the resolution of the first display screen 10 is greater than the resolution of the second display screen 20, and the size of the first display screen 10 is greater than the size of the second display screen 20.

In the embodiment of the present invention, the first display screen 10 is, for example, a main display screen, which can be designed to have a higher resolution, and the screen size can be larger; the second display 20 is a secondary display, and the resolution may be designed to be slightly lower for cost reduction. Therefore, the resolution of the center of the visual field of the optical module can be improved, the resolution of the center position of the human eye 01 is highest, and the resolution of the peripheral area is reduced and is not obvious to sense, so that the human eye 01 can see clear images.

In addition, by reducing the size of the second display screen 20, it is beneficial to reduce the size and weight of the whole optical module.

In some examples of the present invention, the combiner 30 is a half-reflecting half-mirror.

The beam combiner 30 has a reflective optical path and a transmissive optical path. The first light 02 emitted from the first display screen 10 may transmit through the beam combiner 30, and the second light 03 emitted from the second display screen 20 may be reflected by the beam combiner 30, and the first light 02 and the second light 03 may be combined by the beam combiner 30 and then enter the lens assembly 40, and the entered light is amplified by the lens assembly 40 and then enters the human eye 01 for imaging.

Optionally, the reflectivity of the transflective mirror is 50%.

Of course, the reflectivity of the half mirror can be flexibly adjusted according to the requirement, for example, the reflectivity can be reduced, and the transmissivity can be appropriately increased, so that the first light 02 emitted from the first display screen 10 as the main display screen can be incident into the lens assembly 40 in a large amount.

In some examples of the present application, the field angle of the optical module is greater than or equal to 100 ° and the angular resolution PPD of the optical module is greater than 60.

The utility model discloses the scheme can realize that the VR product satisfies large field angle FOV (be greater than or equal to 100 °) and the synchronous requirement of high resolution, can not feel obvious granular sensation when the display screen is watched to the people's eye. The user is guaranteed to have good immersion feeling, and the visual experience feeling of the user is improved.

In some examples of the present application, the lens assembly 40 includes at least one lens configured to reflect the first light ray 02 and the second light ray 03 multiple times to form a folded optical path.

Specifically, the lens assembly 40 includes at least one lens, and a light splitting element, a phase retarder and a polarization reflecting element which are disposed in the lens assembly, wherein the phase retarder is located between the light splitting element and the polarization reflecting element, and the lens assembly 40 forms a folded optical path structure.

That is to say, in the optical module of the embodiment of the present invention, the lens assembly 40 near the human eye 01 can be designed into a folded optical path structure, so that the number of lenses can be reduced, and the propagation path of light can be increased, thereby improving the imaging quality. Particularly, the light splitting element, the phase retarder, the polarization reflecting element and the at least one lens are reasonably combined to form a folded light path, so that light rays are folded back between the light splitting element and the polarization reflecting element, and imaging is facilitated.

It should be noted that the number of lenses in the lens assembly 40 is not limited to one shown in fig. 1, and may be two or more. Do benefit to along with the increase of lens quantity and promote optical imaging quality, but also can increase optical module's size and weight, still can increase manufacturing cost simultaneously, the utility model discloses in to lens quantity among the lens subassembly 40 does not do the restriction.

Of course, the lens assembly 40 is not limited to a folded optical path structure.

The embodiment of the utility model provides a wear display device is still provided. The head mounted display device includes: the method comprises the following steps: the optical module is arranged in the shell.

The head mounted display device is, for example, a VR device. VR equipment includes VR intelligence glasses or VR intelligence helmet etc, the utility model discloses in do not limit to this.

The utility model discloses wear display device's concrete implementation can refer to above-mentioned image display method embodiment, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.

In the above embodiments, the differences between the embodiments are described with emphasis, and different optimization features between the embodiments may be combined to form a better embodiment as long as the differences are not contradictory, and in consideration of the brevity of the text, no further description is given here.

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

Claims

1. An optical module, comprising:

a first display screen (10) for emitting a first light (02);

the second display screen (20) is used for emitting second light rays (03), and the second light rays (03) and the first light rays (02) form a first set included angle;

a beam combiner (30), wherein the beam combiner (30) is disposed on a propagation path of at least a part of the first light (02) and the second light (03), and the beam combiner (30) is configured to reflect the second light (03) in a first direction and transmit at least a part of the first light (02) in the first direction;

the lens assembly (40) is arranged opposite to the first display screen (10) in the first direction, is positioned on the light path of the first light (02) and the second light (03) emitted by the beam combiner (30), and is used for imaging after the first light (02) and the second light (03) are superposed.

2. The optical module according to claim 1, wherein the first direction is parallel to an optical axis of the lens assembly (40).

3. The optical module according to claim 1, wherein the second display screen (20) and the beam combiner (30) are both located between the first display screen (10) and the lens assembly (40), the beam combiner (30) and the second display screen (20) form a second set included angle, and the second light ray (03) enters the beam combiner (30) and is reflected by the beam combiner (30) to enter the lens assembly (40).

4. The optical module of claim 3 wherein the second predetermined angle is B, and B satisfies: b is more than 0 degree and less than 90 degrees.

5. The optical module according to claim 1, wherein the second display screen (20) and the beam combiner (30) are located between the first display screen (10) and the lens assembly (40), the second display screen (20) is horizontally disposed, the beam combiner (30) is disposed in an inclined manner relative to the second display screen (20) to form a second set included angle, and the second set included angle is 45 degrees.

6. The optical module of claim 1, wherein the first predetermined angle is A, and A satisfies: a is more than 0 degree and less than or equal to 90 degrees.

7. An optical module according to claim 1, wherein the beam combiner (30) is further located on the optical path of the first light ray (02) emitted from the central region of the first display screen (10);

the first light (02) emitted from the middle area of the first display screen (10) penetrates through the beam combiner (30) and then enters the lens assembly (40), and the first light (02) emitted from the edge area of the first display screen (10) directly enters the lens assembly (40).

8. Optical module according to claim 1, characterized in that the resolution of the first display screen (10) is greater than the resolution of the second display screen (20), the size of the first display screen (10) being greater than the size of the second display screen (20).

9. An optical module according to claim 1, characterised in that the beam combiner (30) is a half-mirror.

10. The optical module of claim 1, wherein the optical module has a field angle greater than or equal to 100 ° and an angular resolution PPD greater than 60.

11. The optical module according to claim 1, wherein the lens assembly (40) comprises at least one lens configured for reflecting the first light ray (02) and the second light ray (03) multiple times to form a folded light path.

12. A head-mounted display device, comprising:

a housing; and

the optical module of any of claims 1-11 disposed within the housing.