CN218886315U - Optical modules and head-mounted display devices - Google Patents

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 modules and head-mounted display devices

technical field

The utility model relates to the technical field of near-eye display, and more specifically, the utility model relates to an optical module and a head-mounted display device.

Background technique

Existing virtual reality (referred to as VR) equipment usually needs to have a larger field of view (Field of View, FOV) in order to enable users to obtain a good sense of immersion during use. The larger the FOV, the more immersive the experience will be. At present, the field of view of virtual reality equipment is distributed around 100 degrees.

The resolution is reflected in the virtual reality device as PPD (pixel per degree), that is, the number of pixels contained in every 1° angle in the field of view FOV, also known as angular resolution. Since the resolution of the display screen is fixed, when the field of view FOV is larger, the angular resolution PPD is smaller. At present, the angular resolution PPD of most virtual reality devices is about 30, and the human eye will feel obvious graininess when watching the display screen. The two parameters of field of view FOV and angular resolution PPD will conflict in the design of virtual reality equipment. In other words, for VR devices, if you want to maintain a larger field of view FOV, the angular resolution PPD will be smaller, and users will not be able to obtain images with higher resolution during immersive experience.

Utility model content

The purpose of the utility model is to provide a new technical solution for an optical module and a head-mounted display device.

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

The first display screen is used to emit the first light;

The second display screen is used to emit a second light, and the second light forms a first set angle with the first light;

A beam combining mirror, the beam combining mirror is arranged on at least part of the propagation path of the first light and the second light, and the beam combining mirror is configured to reflect the second light along the first emitting in one direction, and emitting at least part of the first light along the first direction in a transmission manner;

The lens assembly, the lens assembly is arranged opposite to the first display screen in the first direction, and is located on the optical path of the first light and the second light emitted by the beam combiner, It is used for superimposing the first light and the second light to form an image.

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

Optionally, both the second display screen and the beam combiner are located between the first display screen and the lens assembly, and the beam combiner and the second display screen form a second setting clip angle, the second light enters the beam combiner, is reflected by the beam combiner and enters the lens assembly.

Optionally, the second set included angle is B, and B satisfies: 0°<B<90°.

Optionally, the second display screen and the beam combiner are located between the first display screen and the lens assembly, the second display screen is arranged horizontally, and the beam combiner is relative to the The second display screen is arranged obliquely to form a second set angle, and the second set angle is 45 degrees.

Optionally, the first set included angle is A, and A satisfies: 0°<A≦90°.

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

The first light emitted from the central area of the first display screen passes through the beam combiner and enters the lens assembly, and the first light emitted from the edge area of the first display screen directly enters the lens assembly.

Optionally, the resolution of the first display screen is greater than that 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 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 includes at least one lens, and the at least one lens is configured to reflect the first light and the second light multiple times to form a folded light path.

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

casing; and

As for the above optical module, the optical module is arranged inside the housing.

The beneficial effects of the utility model are:

The embodiment of the utility model provides an optical module, which belongs to the near-eye display optical system. By adding a display screen (that is, the second display screen) and a beam combining mirror in the entire optical path, the display The light emitted from the screen (that is, the first display screen) and the light emitted from the added display screen are imaged in the human eye, so that the effect of improving the angular resolution of the optical module can be achieved. Such a design can enhance the user's visual experience when using the optical module. Especially when viewing the image formed by the optical module, there is no obvious graininess.

Other features and advantages of the present invention will become clear through the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

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

Fig. 1 is the structural representation of the optical module of the utility model embodiment;

Fig. 2 is a schematic diagram of the principle of improving the angular resolution of the optical module according to the embodiment of the present invention.

Explanation of reference signs:

10. First display screen; 20. Second display screen; 30. Beam combiner; 40. Lens assembly; 01. Human eye; 02. First ray; 03. Second ray.

Detailed ways

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

The following description of at least one exemplary embodiment is merely illustrative in nature, and in no way serves as any limitation of the invention and its application or use.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

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

According to an embodiment of the present invention, an optical module is provided, which is a near-eye display optical system, for example, it can be applied to various forms of head-mounted display devices such as VR devices, including VR Smart glasses or VR helmets, 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 combining mirror 30 and a lens assembly 40;

The first display screen 10 is used to emit the first light 02; the second display 20 is used to emit the second light 03, and the second light 03 forms a first set angle with the first light 02 ;

The beam combiner 30 is disposed on at least part of the propagation path of the first light 02 and the second light 03, and the beam combiner 30 is configured to reflect the second light 03 along the emitting in a first direction, and emitting at least part of the first light ray 02 along the first direction in a transmission manner;

The lens assembly 40 is disposed opposite to the first display screen 10 in the first direction, and is located on the optical path of the first light 02 and the second light 03 emitted by the beam combiner 30 , It is used for superimposing the first ray 02 and the second ray 03 to form an image.

In the optical module of the embodiment of the present invention, by adding a display screen (that is, introducing the second display screen 20) and at least one beam combining mirror 30 in the entire optical path, the display screen (the display screen (ie, introducing the second display screen 20)) and at least one beam combining mirror 30 in the optical module group can be integrated. That is, the light emitted by the first display screen 10) and the light emitted by the added display screen are imaged together in the human eye 01, so that the effect of improving the angular resolution of the optical module can be achieved. Such a design can enhance the user's visual experience when using the optical module. Especially when viewing the image formed by the optical module, there is no obvious graininess.

In the optical module of the embodiment of the present utility model, the first display screen 10 and the second display screen 20 can be used to emit imaging rays respectively, thus forming two imaging rays, and the imaging rays used for imaging 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 by the first display screen 10 and the second light 03 emitted by the second display 20 , and finally the first light 02 and the second light 03 are both magnified. Together into the human eye 01 to achieve imaging, the image that the user finally sees is actually the target display image.

The target display image is a virtual image formed by the first light rays 02 and the second light rays 03 together, so that the number of display pixels included in the target display image can be increased. That is to say, the number of display pixels contained in the target display image is the sum of each display pixel T0 of the first display screen 10 and each display pixel T1 of the second display screen 20, as shown in FIG. Show. Compared with the traditional optical solution of a single display screen including a plurality of display pixels T0 , this solution significantly increases the number of display pixels in the formed target display image, which is beneficial to improve the imaging quality.

In the optical module of the embodiment of the present invention, the beam combiner 30 can not only transmit part of the first light 02, but also reflect the second light 03, so that the first light 02 and the The second light 03 can combine light and allow a large amount of light to enter the lens assembly 40 , which is beneficial to improve the resolution of the imaging, thereby improving the angular resolution of the entire optical module.

It should be noted that the first display screen 10 can be designed, for example, as the main display screen in the entire optical module, which can be used to emit the main imaging light (i.e. the first light ray 02); The screen 20 can be a secondary display screen (or secondary display screen) in the entire optical module, and the second light 03 emitted by it is mainly used to cooperate with the first light 02 emitted by the first display screen 10 to increase Refer to FIG. 2 for the number of display pixels of the final target display image.

The optical module of the embodiment of the present invention belongs to the near-eye display optical module and can be applied to, for example, VR equipment. Wherein, the lens assembly 40 can be designed, for example, as a folded optical path structure, which is beneficial to reducing the size and weight of the optical module. When the optical module is applied inside the head-mounted display device, the size and weight of the head-mounted display device can be reduced, and the comfort of the user when wearing the head-mounted display device can be improved.

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

In the optical module of the embodiment of the present utility model, 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 used to combine the first light 02 and the second light 03 before entering the lens assembly 40, in order to make the first light 02 and the second light 03 As much as possible smoothly enters the lens assembly 40, so 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 utility model, the second display screen 20 and the beam combiner 30 are located between the first display screen 10 and the lens assembly 40, and the beam combiner 30 and the beam combiner The second display screen 20 forms 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 .

In the optical module of the embodiment of the present utility model, the first display screen 10 may be a display screen of the optical module itself, which is used to emit imaging light, and the lens assembly 40 is used for imaging, which is The design is located on one side of the first display screen 10 and has a set distance from the lens assembly 40 . In this way, a certain accommodation space is formed between the lens assembly 40 and the first display screen 10 .

The above-mentioned accommodating space is utilized in the light scheme of the present invention. Specifically, between the first display screen 10 and the lens assembly 40, the second display screen 20 and the beam combiner 30 are arranged using the space between the two, so that the optical module The arrangement of the optical elements in the middle is relatively reasonable, which will not cause the lateral size of the optical module to be too large.

At the same time, the layout in the above example can only use one beam combiner 30 to match the two display screens (i.e. the first display screen 10 and the second display screen 20), so that the two display screens The light rays respectively emitted from the screen can smoothly enter the lens assembly 40 on one side. In this way, during imaging, the display pixels included in the two display screens can be used for superimposition, so as to achieve the purpose of increasing the resolution. That is to say, the layout in the above example can introduce fewer optical elements into the optical module, but can achieve a very good effect of improving the angular resolution of the optical module.

In the above example, the second set included angle is B, and B satisfies: 0°<B<90°.

It should be noted that the second set angle B is as described in the above example, which is the angle formed by the beam combiner 30 and the second display screen 20 . In fact, as long as the second light 03 emitted by the second display screen 20 can enter the beam combining mirror 30 as much as possible, and the beam combining mirror 30 can reflect the second light 03 to all The above-mentioned lens assembly 40 is enough. The above technical effect can be achieved when the second set angle B formed by the beam combiner 30 and the second display screen 20 takes any value from the above-mentioned 0-90 degrees.

More preferably, the second set 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 are arranged in such a way that The space occupied by the two display screens 20 when they are arranged is relatively small, which will not cause the gap between the first display screen 10 and the lens assembly 40 to be too large. The size of the direction is advantageous. Moreover, in this preferred embodiment, the second light 03 emitted by the second display screen 20 can also enter the beam combiner 30 as much as possible, which is beneficial to increase the second light ray entering the lens assembly 40 . Ray 03, which is good for the final imaging.

In a specific example of the present utility model, 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, and the second display The screen 20 is arranged horizontally, and the beam combiner 30 is arranged obliquely relative to the second display screen 20 to form a second set angle, and the second set angle is 45 degrees.

In the layout shown in the above specific example, the second display screen 20 less shields the first display screen 10, so that the first light 02 emitted by the first display screen 10 can enter the first display screen 10 as much as possible. Lens assembly 40. Moreover, this layout method is also relatively simple, and it is easy to adjust the inclination angle of the beam combiner 30, that is, it is easy to arrange the beam combiner 30, which is beneficial to the production and processing of the optical module and can reduce the difficulty of assembling the optical module. .

In some examples of the present invention, the first set included angle is A, and A satisfies: 0°<A≦90°.

Wherein, the first set angle A is the angle formed between the second light 03 and the first light 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 angle A can also be understood as the The included angle formed by the first display screen 10 and the second display screen 20.

In the embodiment of the present utility model, the first light 02 emitted by the first display screen 10 and the second light 03 emitted by the second display screen 20 need to be combined at the beam combiner 30 , so , the two should be able to intersect, so there should be a certain inclination angle between them.

When the first set angle formed between the second ray 03 and the first ray 02 is within the range of the above examples, it can be ensured that the first ray 02 and the second ray 03 are within The light combined at the beam combiner 30 is well combined and then enters the lens assembly 40 for amplification, finally forming a target display image 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 utility model, the beam combiner 30 is also located on the optical path of the first light 02 emitted from the central area of the first display screen 10; The first light ray 02 passes 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 .

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

In an embodiment of the present utility model, the first display screen 10 is, for example, the main display screen, which can be designed to have a higher resolution, and the screen size can be larger; the second display screen 20 is a secondary display screen. Screen, in order to reduce costs, can be designed with a slightly lower resolution. In this way, the resolution of the center of the field of view of the optical module can be improved, the resolution of the center of the human eye 01 is the highest, and the perception of resolution degradation in the surrounding area is not obvious, 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 entire optical module.

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

The beam combiner 30 has a reflected light path and a transmitted light path. The first light 02 emitted by the first display screen 10 can pass through the beam combiner 30, while the second light 03 emitted by the second display screen 20 can be reflected on the beam combiner 30, and passes through the beam combiner 30. The beam combiner 30 can combine the first light 02 and the second light 03 and then enter the lens assembly 40, and the incident light is magnified by the lens assembly 40 and enters the human eye 01 Imaging.

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

Of course, the reflectivity of the half-mirror can also be flexibly adjusted according to needs, for example, the reflectivity can be reduced, and the transmittance can be appropriately increased, so that the first light 02 emitted by the first display screen 10 as the main display screen can A large amount is injected into the lens assembly 40 .

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 solution of the embodiment of the utility model can realize that VR products meet the requirements of large field of view FOV (greater than or equal to 100°) and high resolution synchronously, and human eyes will not feel obvious graininess when watching the display screen. While ensuring that users have a good sense of immersion, it is conducive to improving the user's visual experience.

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

Specifically, the lens assembly 40 includes at least one lens and a light-splitting element, a phase retarder, and a polarizing reflective element disposed in the lens assembly, wherein the phase retarder is located between the light-splitting element and the polarizing reflective element Between, 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 on the side close to the human eye 01 can be designed as a folded optical path structure, which can increase the propagation path of light while reducing the number of lenses , thereby improving the image quality. Specifically, the rational combination of the beam splitting element, the phase retarder and the polarizing reflective element and at least one lens can form a folded optical path, so that the light is folded between the beam splitting element and the polarizing reflective element, thereby facilitating imaging.

It should be noted that the number of lenses in the lens assembly 40 is not limited to one as shown in FIG. 1 , and may be two or more. The increase in the number of lenses is conducive to improving the optical imaging quality, but it will also increase the size and weight of the optical module, and will also increase the production cost. In the present invention, there is no limit to the number of lenses in the lens assembly 40 .

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

The embodiment of the utility model also provides a head-mounted display device. The head-mounted display device includes: a casing and the above-mentioned optical module, and the optical module is arranged in the casing.

The head-mounted display device is, for example, a VR device. The VR equipment includes VR smart glasses or VR smart helmets, etc., which are not limited in the present invention.

The specific implementation of the head-mounted display device in the embodiment of the present invention can refer to the above-mentioned embodiment of the image display method, so at least it has all the beneficial effects brought by the technical solution of the above-mentioned embodiment, and will not be repeated here.

The above-mentioned embodiments focus on the differences between the various embodiments. As long as the different optimization features of the various embodiments do not contradict each other, they can be combined to form a better embodiment. Considering the brevity of the text, no further repeat.

Although some specific embodiments of the present utility model have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, rather than limiting the scope of the present utility model. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (12)

1. An optical module, characterized in that, comprising: The first display screen (10), used to emit the first light (02); The second display screen (20), configured to emit a second light ray (03), the second light ray (03) forms a first set angle with the first light ray (02); A beam combining mirror (30), the beam combining mirror (30) is arranged on at least part of the propagation path of the first light (02) and the second light (03), the beam combining mirror (30) is configured to emit the second light (03) along the first direction through reflection, and emit at least part of the first light (02) along the first direction through transmission; A lens assembly (40), the lens assembly (40) is arranged opposite to the first display screen (10) in the first direction, and is positioned at the first light beam emitted by the beam combiner (30) (02) and the optical path of the second light (03), used for superimposing the first light (02) and the second light (03) to form an image. 2. The optical module according to claim 1, wherein the first direction is parallel to the 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 located between the first display screen (10) and the lens Between the components (40), the beam combiner (30) and the second display screen (20) form a second set angle, and the second light (03) enters the beam combiner (30) ), reflected by the beam combiner (30) into the lens assembly (40). 4. The optical module according to claim 3, wherein the second set included angle is B, and B satisfies: 0°<B<90°. 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 arranged horizontally, and the beam combiner (30) is arranged obliquely relative to the second display screen (20) to form a second set angle, so The second set included angle is 45 degrees. 6 . The optical module according to claim 1 , wherein the first set angle is A, and A satisfies: 0°<A≦90°. 7. The optical module according to claim 1, characterized in that, the beam combiner (30) is also located in the middle area of the first display screen (10) to emit light from the first light (02) on the road; The first light (02) emitted from the central area of the first display screen (10) passes through the beam combiner (30) and then enters the lens assembly (40), the first display screen (10 The first light (02) emitted from the edge region of ) directly enters the lens assembly (40). 8. The 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), and the first display screen ( 10) is larger than the size of the second display screen (20). 9. The optical module according to claim 1, characterized in that the beam combiner (30) is a half mirror. 10 . The optical module according to claim 1 , wherein 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. 11 . 11. The optical module according to claim 1, characterized in that, the lens assembly (40) comprises at least one lens, and the at least one lens is configured to convert the first light (02) and the The second light (03) is reflected multiple times to form a folded light path. 12. A head-mounted display device, comprising: casing; and The optical module according to any one of claims 1-11, wherein the optical module is arranged inside the casing.

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