Display device and virtual display equipment

Abstract

The utility model relates to the technical field of display equipment, in particular to a display device and virtual display equipment. The display device comprises a first image source, a folding and amplifying light path assembly, a second image source and a deflection light path assembly. When the optical system is applied, the field angle of the first image light at the viewing position is effectively increased by folding and amplifying the light path assembly, and the size of the optical system is not large. And the deflecting optical path assembly redirects the second image light to the viewing position and splices the field of view of the second image light on the edge of the field of view of the first image light, so that the field of view of the viewing position is further increased. The composite film assembly realizes polarization state conversion of the first image light and a folded light path through a series of polarization state conversion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, in particular to a display device and a virtual display device. BACKGROUND

[0002] In the field of virtual reality (VR) display technology, the design of the optical system is crucial as it directly affects the user's sense of immersion and quality of experience. An excellent virtual display optical system needs to achieve a balance in multiple aspects: a large pupil diameter to accommodate different user interpupillary distances, a short focal length to reduce device volume, thinness to improve wearing comfort, and a large field of view angle to enhance the sense of immersion. However, these requirements often conflict with each other.

[0003] Increasing the field of view angle of the final display image of the virtual display system is a core problem because it is directly related to the extent of the user's field of view. The larger the field of view angle, the wider the virtual environment that the user can perceive, thereby providing a more realistic immersive experience. However, as the field of view angle increases, the difficulty of designing the optical system also increases. In summary, how to increase the field of view angle within the limited design space is a technical problem that needs to be solved in the field. UTILITY MODEL CONTENT

[0004] Therefore, the present application provides a display device and a virtual display device that can increase the field of view angle within the limited design space.

[0005] In a first aspect, the present application provides a display device, comprising: a first image source configured to emit first image light; a folded and magnified light path assembly disposed between the first image source and a viewing position, the folded and magnified light path assembly being configured to magnify the field of view angle of the first image light; a second image source configured to emit second image light, the position of the second image source being different from the position of the first image source; and a deflection light path assembly disposed on the light exit path of the second image source, the deflection light path assembly being connected to the folded and magnified light path assembly, the deflection light path assembly being configured to redirect the second image light to the viewing position and to splice the field of view of the second image light on the edge of the field of view of the first image light; wherein a first central optical axis of the light exit path of the deflection light path assembly and a second central optical axis of the light exit path of the folded and magnified light path assembly form a first predetermined included angle.

[0006] With reference to the first aspect, in a possible implementation manner, the folded magnifying optical path assembly comprises a composite film assembly and a plurality of lenses; the composite film assembly comprises, in sequence along a first direction, a polarizing element, a first selective light-transmitting film, a second polarization conversion film, and a second selective light-transmitting film, the first direction being a direction in which the first image source is directed towards the viewing position; at least one of the plurality of lenses has a positive refractive power, and at least part of the composite film assembly is attached to an optical surface of one or more of the lenses; the polarizing element converts a polarization state of the first image light into a first circular polarization, the first selective light-transmitting film transmits the first image light in the first circular polarization, the second polarization conversion film converts the polarization state of the first image light in the first circular polarization into a second linear polarization, the second selective light-transmitting film reflects the first image light in the second linear polarization, the second polarization conversion film converts the polarization state of the reflected first image light in the second linear polarization into a second circular polarization, the first selective light-transmitting film reflects the first image light in the second circular polarization, the second polarization conversion film converts the polarization state of the reflected first image light in the second circular polarization into a first linear polarization, and the second selective light-transmitting film transmits the first image light in the first linear polarization to the viewing position.

[0007] With reference to the first aspect, in a possible implementation manner, the first image source emits the first image light in a first linear polarization; the polarizing element comprises a first polarization conversion film attached to an optical surface of the first image source, and the first polarization conversion film converts the polarization state of the first image light in the first linear polarization into the first circular polarization.

[0008] With reference to the first aspect, in a possible implementation manner, the polarizing element comprises a linear polarization film arranged in a light-emitting direction of the first image source, the linear polarization film being configured to convert the polarization state of the first image light into the first linear polarization; and a third polarization conversion film arranged on a side of the linear polarization film away from the first image source, the third polarization conversion film being configured to convert the polarization state of the first image light in the first linear polarization into the first circular polarization.

[0009] With reference to the first aspect, in a possible implementation manner, the plurality of lenses of the folded magnifying optical path assembly comprises, in sequence along the first direction, an aspherical lens, a first lens, and a second lens.

[0010] With reference to the first aspect, in a possible implementation manner, the first selective light-transmitting film is attached to a first optical surface of the first lens facing the aspherical lens, the second polarization conversion film is attached to a second optical surface of the first lens facing the second lens, and the second selective light-transmitting film is attached to a third optical surface of the second lens facing the first lens.

[0011] In a possible implementation manner of the first aspect, the deflection optical path assembly comprises a free-form surface prism including a first curved surface, a second curved surface and a third curved surface, the first curved surface is connected with the second curved surface, one edge of the second curved surface is connected on a side of the folded magnification optical path assembly, the third curved surface is connected with the first curved surface, and one edge of the third curved surface is connected on an optical surface of the folded magnification optical path assembly facing the viewing position; a central optical axis of the first curved surface and a central optical axis of the second curved surface form a second preset included angle, the central optical axis of the second curved surface and a central optical axis of the third curved surface form a third preset included angle, and the central optical axis of the first curved surface and the central optical axis of the third curved surface form a fourth preset included angle.

[0012] In a possible implementation manner of the first aspect, the first curved surface and the second curved surface are jointly configured to adjust the incident angle θ of the second image light on the second curved surface to satisfy θ>arcsin(1 / n), where n is the refractive index of the free-form surface prism.

[0013] In a possible implementation manner of the first aspect, the first preset included angle is any value in a range from 10° to 80°, the second preset included angle is any value in a range from 20° to 60°, the third preset included angle is any value in a range from 20° to 60°, and the fourth preset included angle is any value in a range from 65° to 105°.

[0014] In a second aspect, the present application provides a virtual display device, comprising the display device in any of the preceding aspects.

[0015] In application, the present application effectively increases the field of view of the first image light at the viewing position by the folded magnification optical path assembly, without causing a large optical system volume. The deflection optical path assembly redirects the second image light to the viewing position and splices the field of view of the second image light on the edge of the field of view of the first image light, further increasing the field of view of the viewing position. The composite film assembly realizes the polarization state conversion of the first image light and the folded optical path through a series of polarization state conversions. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 shows a light path schematic diagram of a display device according to an embodiment of the present application.

[0017] Figure 2 Fig. 2 shows a folded optical path schematic diagram of first image source exit linearly polarized light according to an embodiment of the present application.

[0018] Figure 3 Fig. 3 shows a folded optical path schematic diagram of first image light polarized by a linear polarizing film according to another embodiment of the present application.

[0019] Explanation of reference numerals in the attached figures: 1-First image source, 2-Aspherical lens, 3-First lens, 4-Second lens, 8-Viewing position, 9-Second image source, 10-First curved surface, 11-Second curved surface, 12-Third curved surface, 201-Linear polarizing film, 2021-First polarization conversion film, 2022-Third polarization conversion film, 203-First selective light transmission film, 204-Second polarization conversion film, 205-Second selective light transmission film. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] This application provides a display device, in one embodiment, such as... Figure 1 As shown, the display device includes: a first image source 1, a folding magnification optical path assembly, a second image source 9, and a deflection optical path assembly. The first image source 1 emits first image light. The folding magnification optical path assembly is disposed between the first image source 1 and a viewing position 8, and is configured to magnify the field of view of the first image light. The second image source 9 emits second image light, and its position is different from that of the first image source 1. The deflection optical path assembly is disposed on the output light path of the second image source 9, and is interconnected with the folding magnification optical path assembly. The deflection optical path assembly is configured to redirect the second image light to the viewing position 8 and splice the field of view of the second image light onto the edge of the field of view of the first image light. In this embodiment, the first central optical axis of the output light path of the deflection optical path assembly forms a first preset angle with the second central optical axis of the output light path of the folding magnification optical path assembly.

[0022] In this embodiment, the folded magnifying optical path assembly amplifies the field of view of the first image light, thereby effectively increasing the field of view of the image corresponding to the first image light at viewing position 8, and the folded magnifying optical path does not result in a large optical system volume. The deflecting optical path assembly redirects the second image light to illuminate the viewing position 8, and splices the field of view of the image corresponding to the second image light onto the edge of the field of view of the image corresponding to the first image light, thereby further increasing the field of view at viewing position 8.

[0023] Specifically, the field of view edges of the second image light-corresponding image are connected to the field of view edges of the first image light-corresponding image, thereby increasing the field of view; or, a portion of the field of view of the second image light-corresponding image overlaps with a portion of the field of view of the first image light-corresponding image, thereby increasing the field of view.

[0024] In one embodiment, the folded amplifying optical path assembly includes a composite film assembly and multiple lenses. (See reference...) Figure 2 As shown, the composite film assembly includes a polarizer, a first selective light-transmitting film 203, a second polarization conversion film 204, and a second selective light-transmitting film 205 arranged sequentially along a first direction, where the first direction is the direction from the first image source 1 to the viewing position 8. At least one of the multiple lenses has a positive optical power, and at least a portion of the composite film assembly is attached to the optical surface of one or more lenses. In some embodiments, the first image source 1 emits first image light with a first linear polarization state, meaning the first image source 1 directly emits linearly polarized light without the need for linear polarization. The polarizer includes a first polarization conversion film 2021, which is covered on the light-emitting surface of the first image source 1. The first polarization conversion film 2021 converts the polarization state of the first linearly polarized first image light into a first circular polarization state. In application, this embodiment... Figure 2 The removal of the linear polarization film 201 in the middle can save on components.

[0025] In some embodiments, such as Figure 3 As shown, the polarizing element includes a linear polarizing film 201 and a third polarization conversion film 2022. The linear polarizing film 201 is disposed in the light emission direction of the first image source 1, and is used to convert the polarization state of the first image light into a first linear polarization. The third polarization conversion film 2022 is disposed on the side of the linear polarizing film 201 away from the first image source 1, and converts the polarization state of the first image light with the first linear polarization into a first circular polarization. The polarizing element converts the polarization state of the first image light into a first circular polarization. The first selective light-transmitting film 203 transmits the first image light with the first circular polarization. The second polarization conversion film 204 converts the polarization state of the first image light with the first circular polarization into a second linear polarization. The second selective light-transmitting film 205 reflects the first image light with the second linear polarization. The second polarization conversion film 204 converts the polarization state of the reflected first image light with the second linear polarization into a second circular polarization. The first selective light-transmitting film 203 reflects the first image light with the second circular polarization. The second polarization conversion film 204 converts the polarization state of the reflected first image light with the second circular polarization into a first linear polarization. The second selective light-transmitting film 205 transmits the first image light with the first linear polarization to the viewing position 8.

[0026] In some embodiments, the first linear polarization is a linear polarization state in a first direction, the first circular polarization is a right-handed polarization state, the second linear polarization is a linear polarization state in a second direction, the second circular polarization is a left-handed polarization state, and the first direction and the second direction are orthogonal.

[0027] In some embodiments, the first linear polarization is a linear polarization state in the second direction, the first circular polarization is a left-handed polarization state, the second linear polarization is a linear polarization state in the first direction, the second circular polarization is a right-handed polarization state, and the first direction and the second direction are orthogonal.

[0028] Specifically, the first polarization conversion film 2021, the third polarization conversion film 2022 and the second polarization conversion film 204 are all 1 / 4 phase retardation films, the first selective light transmission film 203 is a circularly polarized light semi-transmissive semi-reflective film, which can transmit right-handed polarized light and reflect left-handed polarized light, or which can transmit left-handed polarized light and reflect left-handed polarized light. The second selective light transmission film 205 is a linearly polarized light semi-transmissive semi-reflective film, which can transmit linearly polarized light of a first direction and reflect linearly polarized light of a second direction, or which can transmit linearly polarized light of the second direction and reflect linearly polarized light of the first direction.

[0029] In an embodiment, as shown in FIG. 1, the plurality of lenses of the folded magnifying optical path assembly comprises a non-spherical lens 2, a first lens 3 and a second lens 4 arranged in sequence along a first direction, and at least one of the three lenses has positive optical power, so as to increase the field of view angle of the first image light. Figure 1

[0030] In an embodiment, a polarizer is coated on the non-spherical lens 2, the first selective light transmission film 203 is coated on the first optical surface of the first lens 3 facing the non-spherical lens 2, the second polarization conversion film 204 is coated on the second optical surface of the first lens 3 facing the second lens 4, and the second selective light transmission film 205 is coated on the third optical surface of the second lens 4 facing the first lens 3, so as to form a folded magnifying optical path. The respective film layers are coated on the optical surfaces of the lenses, so that there is no air layer between the film layers and the optical surfaces, which can effectively reduce stray light.

[0031] In the embodiment, since at least one of the non-spherical lens 2, the first lens 3 and the second lens 4 has positive optical power, based on the working principle of the composite film assembly described above, the light passes through one or more of the non-spherical lens 2, the first lens 3 and the second lens 4 multiple times in the process of reflection back and forth, so as to be increased in field of view angle by the optical surface with positive optical power multiple times, and the folded magnification can be realized under the same volume.

[0032] In an embodiment, as shown in FIG. 1, the plurality of lenses of the folded magnifying optical path assembly comprises a non-spherical lens 2, a first lens 3 and a second lens 4 arranged in sequence along a first direction, and at least one of the three lenses has positive optical power, so as to increase the field of view angle of the first image light. Figure 1 ​As shown, the deflection optical path assembly includes a free-form surface prism, the free-form surface prism includes a first curved surface 10, a second curved surface 11 and a third curved surface 12, the first curved surface 10 is connected with the second curved surface 11, one edge of the second curved surface 11 is connected on the side of the folded magnification optical path assembly, the third curved surface 12 is connected with the first curved surface 10, one edge of the third curved surface 12 is connected on the optical surface of the folded magnification optical path assembly facing the viewing position 8. The second image light is refracted after passing through the first curved surface 10 and then irradiates on the second curved surface 11, the second curved surface 11 reflects the second image light to the third curved surface 12, and the third curved surface 12 refracts the second image light to irradiate at the viewing position 8. The positions of the first curved surface 10, the second curved surface 11 and the third curved surface 12 are pre-configured, so that the first field of view of the first image light at the viewing position 8 and the second field of view of the second image light at the viewing position 8 are spliced with each other to obtain a larger spliced field of view.

[0033] The central optical axis of the first curved surface 10 and the central optical axis of the second curved surface 11 form a second preset included angle, the central optical axis of the second curved surface 11 and the central optical axis of the third curved surface 12 form a third preset included angle, and the central optical axis of the first curved surface 10 and the central optical axis of the third curved surface 12 form a fourth preset included angle. The first preset included angle is any value in 10° to 80°, the second preset included angle is any value in 20° to 60°, the third preset included angle is any value in 20° to 60°, and the fourth preset included angle is any value in 65° to 105°.

[0034] In an embodiment, the first curved surface 10 and the second curved surface 11 are jointly configured to adjust the incident angle θ of the second image light on the second curved surface 11 to satisfy: θ>arcsin(1 / n), n is the refractive index of the free-form surface prism, so that the second image light irradiated on the second curved surface 11 can be totally reflected, reducing the loss of the second image light.

[0035] The application also provides a virtual display device, which comprises the display device of any one of the preceding.

[0036] The basic principles of the application are described above in combination with specific embodiments, but it should be pointed out that the advantages, advantages, effects and the like mentioned in the application are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the must-have of each embodiment of the application. In addition, the above specific details are only for the purpose of example and for the purpose of understanding, and the above details do not limit the application to the must-use of the above specific details to realize.

[0037] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply that the connection, arrangement, configuration must be as shown in the block diagrams. As those skilled in the art will recognize, the devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have", and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably, unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0038] It should also be noted that in the devices, apparatuses and methods of the present application, each component or step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalents of the present application.

[0039] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0040] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A display device, characterized by comprising: The application relates to a display device, comprising: a first image source (1) for emitting first image light; a folded magnifying light path assembly arranged between the first image source (1) and a viewing position (8), the folded magnifying light path assembly being configured to magnify a field of view of the first image light; a second image source (9) for emitting second image light, the second image source (9) being arranged at a position different from that of the first image source (1); and a deflection light path assembly arranged on an outgoing light path of the second image source (9), the deflection light path assembly being connected to the folded magnifying light path assembly, the deflection light path assembly being configured to redirect the second image light to the viewing position (8) and to splice a field of view of the second image light on an edge of the field of view of the first image light; wherein a first central optical axis of an outgoing light path of the deflection light path assembly and a second central optical axis of an outgoing light path of the folded magnifying light path assembly form a first preset included angle. The folded magnifying light path assembly comprises a composite film assembly and a plurality of lenses; 2. The display device according to claim 1, wherein wherein the composite film assembly comprises, in sequence along a first direction, a polarizing element, a first selective light-transmitting film (203), a second polarization conversion film (204) and a second selective light-transmitting film (205), the first direction being a direction in which the first image source (1) points to the viewing position (8); at least one of the plurality of lenses has a positive refractive power, and at least part of the composite film assembly is attached to an optical surface of one or more of the lenses; the polarizing element converts a polarization state of the first image light into first circular polarization, the first selective light-transmitting film (203) transmits the first image light in the first circular polarization, the second polarization conversion film (204) converts the polarization state of the first image light in the first circular polarization into second linear polarization, the second selective light-transmitting film (205) reflects the first image light in the second linear polarization, the second polarization conversion film (204) converts the polarization state of the reflected first image light in the second linear polarization into second circular polarization, the first selective light-transmitting film (203) reflects the first image light in the second circular polarization, the second polarization conversion film (204) converts the polarization state of the reflected first image light in the second circular polarization into first linear polarization, and the second selective light-transmitting film (205) transmits the first image light in the first linear polarization to the viewing position (8). The first image source (1) emits the first image light in first linear polarization; 3. The display device according to claim 2, wherein wherein the polarizing element comprises: a first polarization conversion film (2021) attached to an outgoing light surface of the first image source (1), the first polarization conversion film (2021) converting the polarization state of the first image light in the first linear polarization into the first circular polarization. The polarizing element comprises:

4. The display device according to claim 2, wherein a linear polarization film (201) arranged in an outgoing light direction of the first image source (1), the linear polarization film (201) being configured to convert a polarization state of the first image light into the first linear polarization; and ​ A third polarization conversion film (2022) is arranged on the side of the linear polarization film (201) away from the first image source (1), and the third polarization conversion film (2022) converts the polarization state of the first linearly polarized first image light into the first circular polarization.

5. The display device according to claim 2, wherein The plurality of lenses of the folded magnification optical path assembly comprises, in sequence along the first direction, an aspherical lens (2), a first lens (3), and a second lens (4).

6. The display device of claim 5, wherein, The first selective light transmission film (203) is arranged on the first optical surface of the first lens (3) facing the aspherical lens (2), the second polarization conversion film (204) is arranged on the second optical surface of the first lens (3) facing the second lens (4), and the second selective light transmission film (205) is arranged on the third optical surface of the second lens (4) facing the first lens (3).

7. The display device according to claim 1, wherein The deflection optical path assembly comprises: The free-form surface prism comprises a first surface (10), a second surface (11), and a third surface (12), the first surface (10) is connected to the second surface (11), one edge of the second surface (11) is connected to the side of the folded magnification optical path assembly, the third surface (12) is connected to the first surface (10), and one edge of the third surface (12) is connected to the optical surface of the folded magnification optical path assembly facing the viewing position (8); The central optical axis of the first surface (10) and the central optical axis of the second surface (11) form a second preset angle, the central optical axis of the second surface (11) and the central optical axis of the third surface (12) form a third preset angle, and the central optical axis of the first surface (10) and the central optical axis of the third surface (12) form a fourth preset angle.

8. The display device of claim 7, wherein The first surface (10) and the second surface (11) are jointly configured to adjust the incident angle θ of the second image light on the second surface (11) to satisfy θ>arcsin(1 / n), where n is the refractive index of the free-form surface prism.

9. The display device of claim 7, wherein The first preset angle is any value in the range of 10° to 80°, the second preset angle is any value in the range of 20° to 60°, the third preset angle is any value in the range of 20° to 60°, and the fourth preset angle is any value in the range of 65° to 105°.

10. A virtual display device, comprising: The display device as claimed in any one of claims 1 to 9.

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