Optical structures, display devices and optical systems

Abstract

This application provides an optical structure, display device, and optical system, relating to the field of optical technology. The optical structure includes: a display screen; a liquid crystal waveplate located on one side of the display screen's emitting surface; a beam splitter located on the side of the liquid crystal waveplate away from the display screen; a quarter-wave plate located on the side of the beam splitter located away from the display screen; and a reflective polarizer located on the side of the quarter-wave plate away from the display screen. Based on this scheme, two focal planes can be displayed using a single display screen, and the position of the virtual image plane perceived by the human eye can be adjusted, allowing the virtual image plane to move between the two focal planes, thereby reducing visual fatigue caused by focal convergence of the human eye.

Description

Technical Field

[0001] This application relates to the field of optical technology, and more specifically, to optical structures, display devices, and optical systems. Background Technology

[0002] Head-up displays (HUDs), as an advanced driver assistance system, have been widely used in the market in recent years. However, in HUDs, because the image is usually projected at a fixed distance in front of the driver's line of sight, and because the driver's eyes try to adjust their focus and convergence angle when trying to view objects at different distances, the fixed focal plane of the HUD makes it impossible for this adjustment to be consistent with the actual object, thus causing focusing and convergence conflict.

[0003] The same problem exists in virtual reality (VR) or augmented reality (AR) glasses. The user's left and right eyes receive images with parallax, which the brain interprets as depth information to construct a perception of three-dimensional space. However, when a user attempts to view objects at different depths in the virtual world, although the brain processes parallax information to perceive depth, the eye's lens cannot adjust its focus accordingly. Furthermore, while the brain perceives the distance of virtual objects through parallax information, the human eye is actually converging with a screen at a fixed distance, leading to a discrepancy between the convergence angle and the actual distance to the virtual object, thus causing focusing and convergence conflict. Summary of the Invention

[0004] This application provides an optical structure, display device, and optical system that can display two focal planes through a single display screen and can adjust the position of the virtual image plane perceived by the human eye, allowing the virtual image plane to move between the two focal planes, thereby reducing visual fatigue caused by the focal convergence of the human eye.

[0005] In a first aspect, an optical structure is provided, disposed on a display screen, the optical structure comprising: a liquid crystal waveplate located on one side of the light-emitting surface of the display screen; a beam splitter located on the side of the liquid crystal waveplate away from the display screen; a quarter-wave plate located on the side of the beam splitter located away from the display screen; and a reflective polarizer located on the side of the quarter-wave plate away from the display screen.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, when the light emitted by the display screen is unpolarized light, the optical structure further includes a polarizer located between the liquid crystal waveplate and the display screen.

[0007] In conjunction with the first aspect, in certain implementations of the first aspect, the aforementioned liquid crystal waveplate is used to modulate linearly polarized light into elliptically polarized light, the elliptically polarized light including a first linearly polarized light and a second linearly polarized light, the polarization directions of the first linearly polarized light and the second linearly polarized light being perpendicular to each other, and the light amounts of the first linearly polarized light and the second linearly polarized light being different; the aforementioned beam-splitting film is used to transmit a first portion of the elliptically polarized light and reflect a second portion of the elliptically polarized light; the aforementioned quarter-wave plate is used to convert linearly polarized light into circularly polarized light; the aforementioned reflective polarizer is used to reflect the first linearly polarized light and transmit the second linearly polarized light, or reflect the second linearly polarized light and project the first linearly polarized light.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, a glass substrate is disposed between the display screen and the liquid crystal waveplate, and / or, between the liquid crystal waveplate and the beam splitter, and / or, between the beam splitter and the quarter-wave plate, and / or, between the quarter-wave plate and the reflective polarizer.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, an optical structure is used to generate a first image and a second image, the first image being imaged on a first focal plane and the second image being imaged on a second focal plane, the distance between the first focal plane and the second focal plane being equal to the distance between the reflective polarizer and the beam splitter.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the liquid crystal waveplate is configured to: adjust the amount of light of the first linearly polarized light and the amount of light of the second linearly polarized light in elliptically polarized light based on the received voltage signal.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the optical structure further includes: a voltage controller connected to the liquid crystal waveplate, the voltage controller being used to send a voltage signal to the liquid crystal waveplate.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the voltage controller includes: an adjustment control for regulating the voltage signal.

[0013] In a second aspect, a display device is provided, including a display screen and an optical structure in any possible implementation of the optical structure design of the first aspect described above.

[0014] Thirdly, an optical system is provided, including a display screen, an optical structure as described in any possible implementation of the optical structure design of the first aspect above, a lens, and a mirror assembly for reflecting light from the optical structure to the lens. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an optical structure 100 proposed in an embodiment of this application;

[0016] Figure 2 This is a schematic diagram of light transmission in an optical structure 100 according to an embodiment of this application;

[0017] Figure 3 This is a schematic diagram illustrating the principle of an optical structure forming two focal planes according to an embodiment of this application.

[0018] Figure 4 This is a schematic diagram illustrating the principle of an optical structure for forming a virtual image surface according to an embodiment of this application;

[0019] Figure 5 This is a schematic diagram of another optical structure 100 proposed in the embodiments of this application;

[0020] Figure 6 This is a schematic diagram of another optical structure 100 proposed in the embodiments of this application;

[0021] Figure 7 This is a schematic diagram of the architecture of an optical system 200 proposed in an embodiment of this application. Detailed Implementation

[0022] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0023] This application will present various aspects, embodiments, or features relating to a system comprising multiple devices, components, modules, etc. It should be understood and appreciated that individual systems may include additional devices, components, modules, etc., and / or may not include all the devices, components, modules, etc. discussed in conjunction with the accompanying drawings. Furthermore, combinations of these approaches are also possible.

[0024] Furthermore, in the embodiments of this application, the words "exemplary," "for example," etc., are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" in the embodiments of this application should not be construed as being better or more advantageous than other embodiments or design schemes. Specifically, the use of the term "exemplary" is intended to present the concept in a concrete manner.

[0025] The business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0026] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0027] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0028] In the description of the embodiments of this application, the terms "upper," "lower," "left," "right," "inner," "outer," "vertical," and "horizontal," etc., indicate the orientation or positional relationship relative to the orientation or position of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and not to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They can change accordingly depending on the orientation of the components in the accompanying drawings, and therefore should not be construed as limiting this application.

[0029] In the embodiments of this application, the same reference numerals are used to denote the same component or part. For the same part in the embodiments of this application, only one part or component may be labeled with reference numerals in the figures. It should be understood that the reference numerals also apply to other identical parts or components. In addition, the various parts in the figures are not drawn to scale, and the dimensions and sizes of the parts shown in the figures are only exemplary and should not be construed as limiting this application.

[0030] With the development of optical technology, various new display devices have been proposed, such as HUDs, AR devices, and VR devices. However, these devices all have some problems.

[0031] HUDs are typically used in vehicle cockpit display systems. However, HUDs usually have only one focal plane. This design feature can cause focusing and convergence conflict during human eye use, for the following reasons:

[0032] In order to see objects clearly, the human eye needs to adjust the shape of the lens so that light can be accurately focused on the retina. This process is called "focusing" or "accommodation." When the human eye naturally views its surroundings, the lens automatically adjusts its focus to adapt to the distance of objects viewed at different distances. However, in a HUD (Head-Up Display), because the image is typically projected at a fixed distance in front of the driver's line of sight (i.e., the aforementioned single focal plane), the driver's lens needs to maintain the same focal length regardless of changes in actual road conditions. This leads to a focusing conflict; that is, the driver's eye attempts to adjust its focus to adapt to the distance of the virtual image, but in reality, this distance is fixed and does not match the actual road conditions.

[0033] Furthermore, convergence refers to the inward rotation of the eyes in order to focus on the same object. When the human eye naturally views its surroundings, it automatically adjusts the convergence angle based on the distance of objects to ensure that the eyes' lines of sight converge on the object, thus avoiding ghosting. However, in a HUD, because the virtual image is located at a fixed distance, the convergence angle of the eyes also needs to remain at this distance. However, when the driver views the real road conditions, the human eye also automatically adjusts the convergence angle based on the distance of actual objects, leading to convergence conflict. That is, the driver's eyes attempt to adjust the convergence angle to adapt to the real road conditions while simultaneously maintaining focus on the HUD image.

[0034] To address the aforementioned issues, while a solution could be implemented using two optical engines or two display screens in the HUD, such a design would significantly increase the size of the HUD and raise manufacturing costs, making it difficult to popularize and promote.

[0035] For AR or VR devices, the common approach is to provide images with parallax to the left and right eyes to generate 3D vision. The parallax of the images can be interpreted by the human brain as depth information, thereby constructing a perception of three-dimensional space. To achieve this, the glasses in AR or VR devices are usually equipped with two independent displays or lens systems that project different images to the left and right eyes respectively.

[0036] However, in VR or AR glasses, because images are typically projected onto a display screen close to the eyes, the eye's lens is forced to maintain a fixed focal length for extended periods to adapt to the virtual image on the screen. When users attempt to view objects at different depths in the virtual world, although the brain perceives depth based on parallax information, the eye's lens cannot adjust its focal length accordingly. This results in a mismatch between visual information and the actual state of the eye muscles, leading to focusing conflict.

[0037] Furthermore, in VR or AR glasses, although the user's brain perceives the distance of virtual objects through parallax information, the eyes are actually converging on a display screen at a fixed distance. This leads to a discrepancy between the convergence angle and the actual distance to the virtual object, thus causing convergence conflict.

[0038] When the aforementioned focusing conflict and convergence conflict work together on the human visual system, it can lead to visual discomfort and fatigue, affecting the user's experience of using the corresponding products.

[0039] In view of this, this application proposes an optical structure that can display two focal planes through a single display screen, and can adjust the position of the virtual image plane perceived by the human eye, so that the virtual image plane moves between the two focal planes, thereby reducing visual fatigue caused by the focal convergence of the human eye.

[0040] Figure 1 This is a schematic diagram of an optical structure 100 proposed in an embodiment of this application.

[0041] refer to Figure 1 As shown, the optical structure 100 is disposed on the display screen 110, and the optical structure 100 includes:

[0042] The liquid crystal wave plate 120 is located on one side of the light-emitting surface of the display screen 110;

[0043] The beam splitter 130 is located on the side of the liquid crystal waveplate 120 away from the display screen 110;

[0044] A quarter-wave plate 140 is located on the side of the beam splitter 130 away from the display screen 110;

[0045] The reflective polarizer 150 is located on the side of the quarter-wave plate 140 away from the display screen 110.

[0046] In some possible embodiments, the display screen 110 may be a display screen capable of emitting polarized light or a display screen capable of emitting unpolarized light.

[0047] Among them, displays capable of emitting polarized light can be: digital light processing (DLP) displays, liquid crystal on silicon (LCOS) displays, organic light-emitting diode (OLED) displays, or micro light-emitting diode (micro-LED) displays, etc.; displays capable of emitting unpolarized light can be: liquid crystal displays (LCDs), etc.

[0048] In some possible embodiments, when the light emitted by the display screen 110 is unpolarized light, the optical structure 100 may further include a polarizer 160 located between the liquid crystal waveplate 120 and the display screen 110.

[0049] Based on the above design of the display screen 110, and the combination design of the display screen 110 and the polarizer 160, the liquid crystal waveplate 120 can receive polarized light and thus perform corresponding actions on the polarized light.

[0050] In some possible embodiments, the liquid crystal waveplate 120 is used to modulate linearly polarized light into elliptically polarized light, which includes first linearly polarized light and second linearly polarized light, wherein the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other, and the light amounts of the first linearly polarized light and the second linearly polarized light are different; the beam splitter 130 is used to transmit the first part of the elliptically polarized light and reflect the second part of the elliptically polarized light; the quarter-wave plate 140 is used to convert linearly polarized light into circularly polarized light; the reflective polarizer 150 is used to reflect the first linearly polarized light and transmit the second linearly polarized light, or reflect the second linearly polarized light and project the first linearly polarized light.

[0051] In some possible embodiments, within the same optical structure 100, the reflective polarizer 150 may function as one of the two functions described in the above embodiments: when the reflective polarizer 150 can reflect the first linearly polarized light, it can only transmit the second polarized light; when the reflective polarizer 150 can project the first linearly polarized light, it can only reflect the second polarized light. The polarization characteristics of the reflective polarizer 150 are related to its mounting orientation.

[0052] For example, the first linearly polarized light mentioned above can be understood as parallel (P) linearly polarized light, and the second linearly polarized light mentioned above can be understood as perpendicular (S) linearly polarized light.

[0053] It should be understood that when light passes through an optical element (such as a beam splitter, polarizer, etc.) at a non-perpendicular angle, if the polarization vector of the light (i.e., the direction of vibration of the electric vector of the light wave) lies in the plane defined by the incident ray and the reflected ray (or refracted ray), then this polarized light is called P-polarized light and can be used as the first type of linearly polarized light mentioned above. In contrast to P-polarized light, if the polarization vector of the light is perpendicular to the plane defined above, then this polarized light is called S-polarized light and can be used as the second type of linearly polarized light mentioned above.

[0054] It should be noted that the difference between the aforementioned beam splitter 130 and the reflective polarizer 150 is that the beam splitter 130 does not distinguish between the first linearly polarized light and the second linearly polarized light in its reflection and transmission. When elliptically polarized light, including the aforementioned first linearly polarized light and the second linearly polarized light, is incident on the beam splitter 130, it will not only transmit the first linearly polarized light and reflect the second linearly polarized light, or only transmit the second linearly polarized light and reflect the first linearly polarized light. Instead, it will transmit a portion of the first linearly polarized light and a portion of the second linearly polarized light, and reflect another portion of the first linearly polarized light and another portion of the linearly polarized light.

[0055] In some possible embodiments, the liquid crystal waveplate 120 is configured to: adjust the amount of light of the first linearly polarized light and the amount of light of the second linearly polarized light in elliptically polarized light based on the received voltage signal, thereby realizing the acquisition of multiple virtual image surfaces.

[0056] Based on the above technical solution, by arranging the linear polarizer, liquid crystal glass, beam splitter, quarter-wave plate, and reflective polarizer in a specific order, the resulting optical structure can convert the light emitted by the display screen into two light rays with different optical paths, thereby forming two focal planes with different focal lengths. Furthermore, by driving and controlling the liquid crystal wave plate, the brightness of the image on the two focal planes can be adjusted, thereby adjusting the virtual image distance between the two focal planes. This allows the virtual image plane to move between the two focal planes, thus reducing visual fatigue caused by the focal convergence of the human eye.

[0057] To facilitate understanding, the principle by which the above optical structure 100 can form two focal planes is explained below:

[0058] Figure 2 This is a schematic diagram of light transmission in an optical structure 100 according to an embodiment of this application.

[0059] refer to Figure 2 As shown, the display screen 110 of the optical structure 100 is an LCD, so a polarizer 160 is provided in the optical structure 100.

[0060] The light emitted from the display screen 110 is converted into linearly polarized light (in this example, it is assumed that the linearly polarized light is P-polarized light) after passing through the polarizer 160. The P-polarized light then passes through the liquid crystal waveplate 120 and is converted into elliptically polarized light. This elliptically polarized light then passes sequentially through the beam splitter 130 and the quarter-wave plate 140 before being incident on the reflective polarizer 150. At this point, based on the effect of the reflective polarizer 150 on the elliptically polarized light, the P-polarized light within the elliptically polarized light is transmitted (this portion of the light...). Figure 2 (denoted as ray1), and reflects the S-polarized light in the elliptically polarized light (this part of the light is in Figure 2 (referred to as ray2 in Chinese);

[0061] The reflected S-polarized light passes through the quarter-wave plate 140 again, and this part of the S-polarized light is converted into circularly polarized light (assuming that the quarter-wave plate 140 in this embodiment can convert this part of the S-polarized light into right-hand circularly polarized light). After the circularly polarized light passes through the beam splitter 130, part of the circularly polarized light is reflected, and the reflected part of the circularly polarized light becomes left-hand circularly polarized light.

[0062] The aforementioned left-handed circularly polarized light, after passing through a quarter-wave plate 140, is converted back into P-polarized light. This P-polarized light then passes through a reflecting polarizer 150 and is directly transmitted (this portion of the light...). Figure 2 (referred to as ray3 in Chinese).

[0063] Figure 3 This is a schematic diagram illustrating the principle of an optical structure forming two focal planes according to an embodiment of this application.

[0064] According to the optical Gaussian formula: It can be seen that l′ is used to represent the image distance, that is, the vertical distance from the image to the lens, l is used to represent the object distance, that is, the vertical distance from the display screen 110 to the lens, and f′ is used to represent the focal length of the lens. The focal length f′ of the lens is fixed, so changing the object distance l can change the image distance l′. Since the image is formed on the focal plane, based on this principle, two focal planes corresponding to different image distances can be obtained.

[0065] It can also be seen that the optical structure 100 proposed in this application embodiment is used to generate a first image and a second image. The first image is imaged on a first focal plane 01, and the second image is imaged on a second focal plane 02. The distance between the first focal plane 01 and the second focal plane 02 is equal to the distance between the reflective polarizer 150 and the beam splitter 130.

[0066] Wherein, the first focal plane 01 can be the far focal plane proposed in the above embodiment, and the second focal plane 02 can be the near focal plane proposed in the above embodiment.

[0067] In some possible embodiments, considering that the optical devices mentioned in the embodiments of this application are all relatively thin, and even the thickness of some devices can be ignored, the distance between the reflective polarizer 150 and the beam splitter 130 can refer to the distance from the lower surface of the reflective polarizer 150 to the upper surface of the beam splitter 130, or the distance from the lower surface of the reflective polarizer 150 to the lower surface of the beam splitter 130, or the distance from the upper surface of the reflective polarizer 150 to the upper surface of the beam splitter 130, or the distance from the upper surface of the reflective polarizer 150 to the lower surface of the beam splitter 130.

[0068] refer to Figure 3 As shown, ray1 and ray3 are sequentially incident on the lens group of an optical system, such as the lens group or mirror group of a HUD, or the lens group or mirror group of a VR or AR device. Because ray1 and ray3 have different optical path lengths, the virtual image distances of the images generated based on ray1 and ray3 are different, corresponding to two focal planes. Figure 3 In the diagram, these two focal planes are denoted as the near focal plane and the far focal plane, respectively. The near focal plane corresponds to ray3, and the far focal plane corresponds to ray1.

[0069] The virtual image distance refers to the distance between the virtual image and the observer's eye. For the near-focal plane, forming the image on the near-focal plane is equivalent to moving the display screen 110 towards... Figure 3 The right side shown is pulled back, and the position pulled back to can be understood as an equivalent position of the display screen 110. In fact, both ray1 and ray3 are emitted by the display screen 110 located at the actual position.

[0070] Furthermore, for the two focal planes formed by the optical structure 100 proposed in this application embodiment, based on the brightness of the images presented by these two focal planes, multiple virtual image planes that can be perceived by the human eye can be obtained, as follows:

[0071] Figure 4 This is a schematic diagram illustrating the principle of an optical structure forming a virtual image plane according to an embodiment of this application.

[0072] refer to Figure 4 As shown in (a), since the two images formed in front of a person are imaged on the near focal plane and the far focal plane respectively, the two images are superimposed by the human visual system to form a new virtual image. This virtual image is processed by the visual system and imaged on a virtual image plane between the two focal planes.

[0073] The virtual image plane is generally located between the two focal planes, but the specific location of the virtual image plane is related to the image brightness of the near focal plane and the image brightness of the far focal plane. In other words, it is related to the amount of light in ray1 and ray3.

[0074] Linearly polarized light, after passing through the liquid crystal waveplate 120, can be transformed into elliptically polarized light with different amounts of light than the first and second linearly polarized light. This results in ray1 and ray3 with different energies (or light amounts). The phase of the liquid crystal waveplate 120 can be controlled by a voltage signal, thereby adjusting the energy of ray1 and ray3. This allows for brightness adjustment of the virtual image (or virtual image for short) generated based on ray1 and the virtual image generated based on ray3. At this point, the image position of the virtual image formed by the superposition of ray1 and ray3, perceived by the human eyes, is located between two focal planes (denoted as the near focal plane and the far focal plane, respectively). However, the specific position is determined by the brightness of the images corresponding to the two virtual images. In other words, there is a correspondence between the depth of field of the superimposed virtual image perceived by the human eye and the brightness of the two virtual images. This correspondence can be referenced... Figure 4 As shown in (b) above. Based on this, by controlling the ratio of P-polarized light to S-polarized light in the elliptically polarized light converted by the liquid crystal waveplate 120, the brightness of the virtual image presented on the two focal planes can be adjusted, thereby enabling the human eye to obtain virtual images of different depths, that is, the virtual image can be imaged on virtual image surfaces at different positions.

[0075] Figure 5 This is a schematic diagram of another optical structure 100 proposed in the embodiments of this application.

[0076] In some possible embodiments, in order to achieve the above-mentioned adjustment of the virtual image plane position, the optical structure 100 may further include:

[0077] A voltage controller 180 is connected to a liquid crystal waveplate 120 and is used to send voltage signals to the liquid crystal waveplate 120.

[0078] In some possible embodiments, the voltage controller 180 described above may include an adjustment control 181 for regulating the voltage signal.

[0079] In some possible embodiments, the aforementioned adjustment control 181 may be a physical control that is physically connected to the voltage controller 180, such as a knob, slider, or handle button for adjusting the resistance of a sliding rheostat.

[0080] In some possible embodiments, the aforementioned adjustment control 181 may also be a device wirelessly connected to the voltage controller 180, which drives the voltage controller 180 to output a voltage signal in response to the voltage value via a wireless signal.

[0081] Based on the above technical solution, voltage control of the liquid crystal waveplate 120 in the optical structure 100 can be achieved, enabling the liquid crystal waveplate 120 to process polarized light and obtain elliptically polarized light including first linearly polarized light and second linearly polarized light with different light amounts. Ultimately, it is possible to form virtual images of different brightness on the two focal planes. Combined with the mechanism of human visual system processing two virtual images of different brightness, the position of the virtual image plane can be adjusted.

[0082] In some possible embodiments, considering that the optical components in the optical structure 100 are relatively thin and prone to bending, a glass substrate 170 may be provided between the display screen 110 and the liquid crystal waveplate 120, and / or between the liquid crystal waveplate 120 and the beam splitter 130, and / or between the beam splitter 130 and the quarter-wave plate 140, and / or between the quarter-wave plate 140 and the reflective polarizer 150, to support the corresponding optical components and prevent bending.

[0083] In some possible embodiments, the glass substrate 170 may be bonded to the optical devices opposite to the upper and lower surfaces of the glass substrate 170, or there may be a certain gap between the glass substrate 170 and the optical devices opposite to the upper and / or lower surfaces of the glass substrate 170.

[0084] Figure 6 A schematic diagram of another optical structure 100 proposed in the embodiments of this application.

[0085] refer to Figure 6 As shown in (a), three glass substrates 170 are introduced into the optical structure 100, namely 170-1, 170-2 and 170-3. Among them, glass substrate 170-1 is located between the reflective polarizer 150 and the quarter-wave plate 140, and is closely attached to the reflective polarizer 150 and the quarter-wave plate 140; glass substrate 170-2 is located between the beam splitter 130 and the liquid crystal wave plate 120, and is closely attached to the beam splitter 130 and the liquid crystal wave plate 120; glass substrate 170-3 is located between the liquid crystal wave plate 120 and the polarizer 160, and is closely attached to the liquid crystal wave plate 120 and the polarizer 160.

[0086] refer to Figure 6As shown in (b), three glass substrates 170 are introduced into the optical structure 100, namely 170-4, 170-5 and 170-6. Among them, glass substrate 170-3 is located between the beam splitter 130 and the quarter-wave plate 140, and is closely attached to the beam splitter 130 and the quarter-wave plate 140; glass substrate 170-5 is located between the beam splitter 130 and the liquid crystal wave plate 120, and is closely attached only to the liquid crystal wave plate 120, with a certain gap between glass substrate 170-5 and the beam splitter 130; glass substrate 170-6 is located between the liquid crystal wave plate 120 and the polarizer 160, and is closely attached to the liquid crystal wave plate 120 and the polarizer 160.

[0087] The quantity, location, and thickness of the glass substrates 170 can be adjusted according to different product application scenarios, and are detailed here.

[0088] Based on the above technical solution, by setting a glass substrate 170 between at least two optical devices in the optical structure 100, the flatness of the optical devices can be increased and bending of the optical devices can be avoided.

[0089] Furthermore, embodiments of this application also propose a display device, which includes a display screen and any of the optical structures 100 proposed in embodiments of this application.

[0090] In some possible embodiments, the display device described above may be a VR device or an AR device.

[0091] Figure 7 This is a schematic diagram of the architecture of an optical system 200 proposed in an embodiment of this application.

[0092] refer to Figure 7 As shown, the optical system 200 includes:

[0093] Display screen 110;

[0094] Any one of the optical structures 100 proposed in the embodiments of this application;

[0095] Lens 210;

[0096] Reflector group 220, the reflector group 220 is used to reflect light from optical structure 100 ( Figure 6 Ray1 and ray3 in the image are reflected to the lens so that the first image and the second image are respectively imaged on the first focal plane O1 and the second focal plane O2 located behind the lens.

[0097] In some possible embodiments, the optical system 200 described above may be a HUD, which is applied in a vehicle, and the lens 210 may be a vehicle window.

[0098] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0099] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0100] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical structure, characterized by, An optical structure is arranged on a display screen, the optical structure comprising: a liquid crystal wave plate arranged on one side of a light emitting surface of the display screen; a light splitting film arranged on a side of the liquid crystal wave plate away from the display screen; a quarter wave plate arranged on a side of the light splitting film away from the display screen; a reflective polarizer arranged on a side of the quarter wave plate away from the display screen; wherein the liquid crystal wave plate is configured to modulate linearly polarized light into elliptically polarized light, the elliptically polarized light comprising a first linearly polarized light and a second linearly polarized light, the first linearly polarized light and the second linearly polarized light being perpendicular to each other, the first linearly polarized light and the second linearly polarized light having different light quantities; the light splitting film is configured to transmit a first portion of the elliptically polarized light and reflect a second portion of the elliptically polarized light; the quarter wave plate is configured to convert linearly polarized light into circularly polarized light; and the reflective polarizer is configured to reflect the first linearly polarized light and transmit the second linearly polarized light, or reflect the second linearly polarized light and transmit the first linearly polarized light.

2. The optical structure of claim 1, wherein, In a case where the display screen emits non-polarized light, the optical structure further comprises: a polarizer arranged between the liquid crystal wave plate and the display screen.

3. The optical structure of claim 1 or 2, wherein, A glass substrate is arranged between the display screen and the liquid crystal wave plate, and / or between the liquid crystal wave plate and the light splitting film, and / or between the light splitting film and the quarter wave plate, and / or between the quarter wave plate and the reflective polarizer.

4. The optical structure of claim 1 or 2, wherein, The optical structure is configured to generate a first image and a second image, the first image being imaged on a first focal plane, and the second image being imaged on a second focal plane, a distance between the first focal plane and the second focal plane being equal to a distance between the reflective polarizer and the light splitting film.

5. The optical structure of claim 1 or 2, wherein, The liquid crystal wave plate is configured to adjust the light quantity of the first linearly polarized light and the light quantity of the second linearly polarized light in the elliptically polarized light based on a received voltage signal.

6. The optical structure of claim 5, wherein, The optical structure further comprises: a voltage controller connected to the liquid crystal wave plate, the voltage controller being configured to send the voltage signal to the liquid crystal wave plate.

7. The optical structure of claim 6, wherein, The voltage controller comprises: an adjustment control configured to adjust the voltage signal.

8. A display device, characterized by comprising: The optical structure comprises: a display screen; the optical structure according to any one of claims 1 to 7.

9. An optical system characterized by comprising: The optical structure comprises: a display screen; the optical structure according to any one of claims 1 to 7; a lens; a mirror group configured to reflect light from the optical structure to the lens.

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