Optical modules, image sources for Pancake optical systems, and VR devices

Abstract

The present application provides an optical module, an image source for a Pancake optical system, and a VR device. When in use, the image light emitted from the display screen can be first converted into light in two polarization states, and the polarization selection plate allows the light in the second polarization state to be transmitted. Through the folded optical path formed by the polarizing plate and the polarization selection plate, part of the light in the first polarization state is continuously converted into light in the second polarization state and emitted from the polarization selection plate. Therefore, the present application can convert image light into polarized light and reduce the light loss in the polarization state conversion process, thereby ensuring that the optical module can provide high-brightness polarized image light. Among them, the first sub-units separated from each other can individually convert the polarization state of the image light emitted by each pixel unit, avoiding the image light of different pixel units from entering the non-corresponding first sub-unit, thereby avoiding the image light of different pixel units from overlapping each other and causing blur when viewing.

Description

Technical Field

[0001] The present application relates to the field of optical display technology, and in particular to an optical module, an image source for a Pancake optical system, and a VR device. Background Art

[0002] The display used in VR devices using the Pancake short-focus solution generally requires a high-resolution OLED display. When used, the image light emitted by the OLED display needs to be converted into polarized light. Since the OLED display is a self-luminous screen and does not require a backlight when working, the light emitted by the OLED display has no polarization characteristics. And because VR devices using the Pancake short-focus solution must use polarized light, it is necessary to add a polarizer to the OLED display to change the polarization state of the light beam emitted by the screen. However, adding a polarizer will cause the brightness to be attenuated by half, resulting in a huge waste of light energy. Therefore, how to provide polarized image light with lower light loss is a technical problem that needs to be solved in this field. Summary of the invention

[0003] In view of this, the present application provides an optical module, an image source for a Pancake optical system, and a VR device, which can provide polarized image light with lower light loss.

[0004] In a first aspect, the present application provides an optical module, comprising: a display screen, comprising a plurality of pixel units arranged in an array; a polarizing plate attached to a light-emitting surface of the display screen, the polarizing plate being configured to convert a polarization state of transmitted light into a first polarization state and a second polarization state; the polarizing plate being divided into a plurality of mutually independent first sub-units arranged in an array, the plurality of the first sub-units being arranged in a one-to-one correspondence with the plurality of the pixel units; a polarization selection plate attached to a surface of the polarizing plate away from the display screen, the polarization selection plate being configured to reflect light in the first polarization state and transmit light in the second polarization state; and a first partition component being arranged in the polarizing plate, the first partition component being configured to separate any two of the first sub-units from each other.

[0005] When in use, this aspect can first convert the image light emitted from the display screen into light in two polarization states, and the polarization selection plate allows the light in the second polarization state to be transmitted. Through the folded light path formed by the polarizing plate and the polarization selection plate, part of the light in the first polarization state is continuously converted into light in the second polarization state and emitted from the polarization selection plate. Therefore, this aspect can convert image light into polarized light and reduce the light loss in the polarization state conversion process, thereby ensuring that the optical module can provide high-brightness polarized image light. Among them, the first sub-units separated from each other can individually convert the polarization state of the image light emitted by each pixel unit, avoiding the image light of different pixel units from entering the non-corresponding first sub-unit, thereby avoiding the image light of different pixel units from overlapping each other and causing blur when viewing.

[0006] In combination with the first aspect, in a possible implementation, the first partition assembly includes: a plurality of first reflective plates, the plurality of first reflective plates are respectively disposed between two adjacent first sub-units, and the first reflective plates are configured to reflect light.

[0007] In combination with the first aspect, in a possible implementation manner, the first reflective plate is provided on each side wall of the first subunit facing the adjacent first subunit.

[0008] In combination with the first aspect, in a possible implementation manner, the first reflector is made of a silver film layer.

[0009] In combination with the first aspect, in a possible implementation, the polarization selection plate is divided into a plurality of independent second sub-units arranged in an array, and the plurality of second sub-units are arranged in a one-to-one correspondence with the plurality of first sub-units; wherein the optical module further includes: a second separation component, which is arranged in the polarization selection plate, and the second separation component is constructed to separate any two of the second sub-units from each other.

[0010] In combination with the first aspect, in a possible implementation manner, the second partition assembly includes: a plurality of second reflective plates, the second reflective plates are arranged between two adjacent second sub-units, and the second reflective plates are configured to reflect light.

[0011] In combination with the first aspect, in a possible implementation manner, the second reflective plate is provided on each side wall of the second subunit facing the adjacent second subunit.

[0012] In combination with the first aspect, in a possible implementation manner, the second reflector is a silver film layer.

[0013] In combination with the first aspect, in a possible implementation manner, the plurality of pixel units include a red light pixel unit, a green light pixel unit, and a blue light pixel unit.

[0014] In combination with the first aspect, in a possible implementation manner, the polarizing plate is a scattering plate.

[0015] In a second aspect, the present application provides an image source for a Pancake optical system, comprising: the aforementioned optical module.

[0016] The second aspect includes the entire structure of the first aspect, and the technical effects of the second aspect will not be repeated here.

[0017] In a third aspect, the present application provides a Pancake short-focus VR device, including: the aforementioned optical module.

[0018] The third aspect includes the entire structure of the first aspect, and the technical effects of the third aspect will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic structural diagram of an optical module provided in one embodiment of the present application.

[0020] Figure 2 Shown is a structural schematic diagram of an optical module provided in another embodiment of the present application.

[0021] Figure 3 Shown is a schematic diagram of a rough optical path of a partial structure provided in an embodiment of the present application.

[0022] Figure 4 Shown is a cross-sectional schematic diagram of a polarizing plate or a polarization selection plate provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The following description is given to enable those skilled in the art to implement and use the invention and incorporate it into a specific application context. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Thus, the present invention is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0025] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the practice of the present invention need not be limited to these specific details. In other words, known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0026] The reader is reminded of all documents and literature filed simultaneously with this specification and open to public inspection, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) can be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0027] Note that, where used, the symbols left, right, front, back, top, bottom, forward, reverse, clockwise and counterclockwise are used only for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or direction between the various parts of the object. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Note that, in the case of use, further, preferably, further and more preferably are simple beginnings for explaining another embodiment based on the previous embodiment, and the content of further, preferably, further or more preferably followed by the above embodiment is combined with the previous embodiment as a complete composition of another embodiment. Several further, preferably, further or more preferably settings followed by the same embodiment can be arbitrarily combined to form another embodiment.

[0030] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0031] The display used in VR devices using the Pancake short-focus solution generally requires a high-resolution OLED display. When used, the image light emitted by the OLED display needs to be converted into polarized light. Since the OLED display is a self-luminous screen and does not require a backlight when working, the light emitted by the OLED display has no polarization characteristics. And because VR devices using the Pancake short-focus solution must use polarized light, it is necessary to add a polarizer to the OLED display to change the polarization state of the light beam emitted by the screen. However, adding a polarizer will cause the brightness to be attenuated by half, resulting in a huge waste of light energy. Therefore, how to provide polarized image light with lower light loss is a technical problem that needs to be solved in this field.

[0032] Based on this, the present application provides an optical module, an image source for a Pancake optical system, and a VR device.

[0033] Exemplary Optical Modules

[0034] The present application provides an optical module. Figure 1 Shown is a schematic structural diagram of an optical module provided in one embodiment of the present application. Figure 4 FIG. 1 is a cross-sectional schematic diagram of a polarizing plate or a polarization selection plate provided in one embodiment of the present application. Figure 1 As shown, the optical module includes: a display screen 1, a polarizing plate 2, a polarization selection plate 3 and a first separation component 4.

[0035] The display screen 1 includes a plurality of pixel units 101 arranged in an array.

[0036] The polarizing plate 2 is attached to the light emitting surface of the display screen 1 , and the polarizing plate 2 is configured to convert the polarization state of the transmitted light into a first polarization state and a second polarization state.

[0037] Reference Figure 4 The polarizing plate 2 is divided into a plurality of mutually independent first sub-units 201 arranged in an array, and the plurality of first sub-units 201 are arranged in one-to-one correspondence with the plurality of pixel units 101 .

[0038] The polarization selection plate 3 is attached to the surface of the polarizing plate 2 away from the display screen 1 , and the polarization selection plate 3 is configured to reflect light of a first polarization state and transmit light of a second polarization state.

[0039] The first partition component 4 is disposed in the deflecting plate 2 , and the first partition component 4 is configured to separate any two first subunits 201 from each other.

[0040] When using this embodiment, refer to Figure 3As shown, the pixel unit 101 emits image light, and the image light emitted by each pixel unit 101 is polarized by the corresponding first subunit 201, and the image light emitted by the pixel unit 201 is converted into a first light of a first polarization state and a second light of a second polarization state. The first light of the second polarization state is transmitted through the polarization selection plate 3, and the first light of the first polarization state is reflected back to the first subunit 201, and the reflected first light of the first polarization state is reflected again at the interface between the pixel unit 101 and the first subunit 201. The first subunit 201 converts the reflected first light of the first polarization state into a second light of the first polarization state and a second light of the second polarization state, and the second light of the second polarization state is transmitted through the polarization selection plate 3, and the second light of the first polarization state is reflected back to the first subunit 201 again, and then the above process is repeated.

[0041] This embodiment can first convert the image light emitted from the display screen 1 into light of two polarization states, and the polarization selection plate 3 allows the light of the second polarization state to be transmitted. Specifically, the first polarization state can be an S polarization state, and the second polarization state is a P polarization state. Through the folded light path formed by the polarizing plate 2 and the polarization selection plate 3, part of the light of the first polarization state is continuously converted into light of the second polarization state and emitted from the polarization selection plate 3. Therefore, this embodiment can convert the image light into polarized light, and reduce the light loss in the polarization state conversion process, thereby ensuring that the optical module can provide high-brightness polarized image light. Among them, the first sub-units 201 separated from each other can individually convert the polarization state of the image light emitted by each pixel unit 101, avoiding the image light of different pixel units 101 from entering the non-corresponding first sub-unit 201, thereby avoiding the image light of different pixel units 101 from overlapping each other and causing blur when viewing.

[0042] In one embodiment, referring to Figure 3 and Figure 4 As shown, the first partition assembly includes a plurality of first reflective plates 401 , which are respectively disposed between two adjacent first subunits 201 , and the first reflective plates 401 are configured to reflect light.

[0043] In this embodiment, the light that tends to escape from the first subunit 201 can be reflected back by the first reflector 401, further preventing the image light of the pixel unit 101 from entering the non-corresponding first subunit 201, avoiding light energy loss and improving light energy utilization.

[0044] In one embodiment, a first reflector 401 is disposed on each side wall of the first subunit 201 facing the adjacent first subunit 201, which can further prevent the light in the first subunit 201 from being emitted from the side, thereby further improving the light energy utilization rate.

[0045] In one embodiment, the first reflective plate 401 is made of a silver film layer, which has a high reflectivity and can further reduce light energy loss.

[0046] Figure 2 FIG. 1 is a schematic diagram of the structure of an optical module provided by another embodiment of the present application. Figure 2 and Figure 4 As shown, the polarization selection plate 3 is divided into a plurality of second subunits 301 arranged in an array and independent of each other, and the plurality of second subunits 301 are arranged one-to-one with the plurality of first subunits 201. The optical module further includes a second separation component 5, which is arranged in the polarization selection plate 3, and the second separation component 5 is configured to separate any two second subunits 301 from each other.

[0047] In this embodiment, the second subunits 301 are separated by the second separation component 5. The separated second subunits 301 can individually select the polarization state of the image light emitted by each first subunit 201, thereby avoiding the image light in different second subunits 301 from overlapping and causing blur when viewed.

[0048] Figure 3 FIG. 1 is a schematic diagram of a general optical path of a part of the structure provided by an embodiment of the present application. Figure 3 The straight line with an arrow in the middle represents the approximate light path. Figure 3 and Figure 4 As shown, the second partition assembly includes a plurality of second reflective plates 501 , and the second reflective plates 501 are arranged between two adjacent second sub-units 301 .

[0049] In this embodiment, the light that tends to escape from the second subunit 301 can be reflected back through the reflection of the second reflection plate 501, further avoiding overlapping and crosstalk between image lights in different second subunits 301, avoiding light energy loss, and improving light energy utilization.

[0050] In one embodiment, a second reflector 501 is disposed on each side wall of the second subunit 301 facing the adjacent second subunit 301 , which can further prevent the light in the second subunit 301 from being emitted from the side, thereby further improving the light energy utilization rate.

[0051] In one embodiment, the second reflective plate 501 is made of a silver film layer, which has a high reflectivity and can further reduce light energy loss.

[0052] In one embodiment, the plurality of pixel units include a red pixel unit, a green pixel unit and a blue pixel unit, and the pixel units of different colors all have corresponding first subunits. In this embodiment, the display screen may adopt an OLED display screen, which may provide a sufficiently high PPI (Pixels Per Inch).

[0053] In one embodiment, the polarizing plate is selected from a scattering plate, referring to Figure 3 As shown, the polarizing plate using the scattering plate can scatter the image light emitted by the pixel unit 101. In the scattering process of the scattering plate, the image light is also converted into two orthogonal polarization states.

[0054] Example image source for Pancake optical system

[0055] The present application also provides an image source for a Pancake optical system, which includes the aforementioned optical module.

[0056] In the Pancake optical system, polarized image light needs to be used. The aforementioned optical module can provide polarized image light and can ensure a high light energy utilization rate.

[0057] Exemplary VR Devices

[0058] The present application also provides a Pancake short-focus VR device, which includes the aforementioned optical module.

[0059] In the VR device of Pancake short-focus solution, polarized image light is required. The aforementioned optical module can provide polarized image light and can ensure a high light energy utilization rate.

[0060] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0061] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0062] It should also be noted that in the device and apparatus of the present application, each component can be decomposed and / or reassembled, and these decompositions and / or reassemblies should be regarded as equivalent solutions of the present application.

[0063] 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 general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features of the present invention.

[0064] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An optical module, It is characterized in that include: A display screen, comprising a plurality of pixel units arranged in an array; A polarizing plate, attached to the light-emitting surface of the display screen, wherein the polarizing plate is configured to convert the polarization state of the transmitted light into a first polarization state and a second polarization state; the polarizing plate is divided into a plurality of first sub-units arranged in an array and independent of each other, and the plurality of the first sub-units are arranged in a one-to-one correspondence with the plurality of the pixel units; a polarization selection plate, attached to a surface of the polarizing plate away from the display screen, wherein the polarization selection plate is configured to reflect light of the first polarization state and transmit light of the second polarization state; and The first partition component is arranged in the deflecting plate, and the first partition component is configured to separate any two of the first sub-units from each other.

2. The optical module according to claim 1, It is characterized in that The first partition assembly comprises: A plurality of first reflective plates are respectively arranged between two adjacent first sub-units, and the first reflective plates are configured to reflect light.

3. The optical module according to claim 2, It is characterized in that The first reflective plate is disposed on each side wall of the first subunit facing the adjacent first subunit.

4. The optical module according to claim 2, It is characterized in that The first reflector is a silver film layer.

5. The optical module according to claim 1, It is characterized in that The polarization selection plate is divided into a plurality of second sub-units arranged in an array and independent of each other, and the plurality of the second sub-units are arranged in a one-to-one correspondence with the plurality of the first sub-units; Wherein, the optical module further includes: The second separation component is arranged in the polarization selection plate, and the second separation component is configured to separate any two of the second sub-units from each other.

6. The optical module according to claim 5, It is characterized in that The second partition assembly comprises: A plurality of second reflective plates, wherein the second reflective plates are arranged between two adjacent second sub-units, and the second reflective plates are configured to reflect light.

7. The optical module according to claim 6, It is characterized in that The second reflective plate is disposed on each side wall of the second subunit facing the adjacent second subunit.

8. The optical module according to claim 6, It is characterized in that The second reflector is a silver film layer.

9. The optical module according to claim 1, It is characterized in that The plurality of pixel units include a red pixel unit, a green pixel unit and a blue pixel unit.

10. The optical module according to any one of claims 1 to 9, It is characterized in that The polarizing plate is a scattering plate.

11. An image source for a Pancake optical system, It is characterized in that include: An optical module as claimed in any one of claims 1 to 10.

12. A Pancake short-focus VR device, It is characterized in that include: An optical module as claimed in any one of claims 1 to 10.

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