Optical structure, display device, and optical system

Abstract

The invention provides an optical structure, a display device and an optical system, and relates to the technical field of optics. The liquid crystal wave plate is positioned on one side of the light-emitting surface of the display screen; the light splitting film is positioned on one side of the liquid crystal wave plate away from the display screen; the quarter-wave plate is located on the side, away from the display screen, of the light splitting film; the reflection polaroid is located on the side, away from the display screen, of the quarter-wave plate. Based on the scheme, display of two focal planes can be realized through one display screen, and the position of the virtual image plane perceived by human eyes can be adjusted, so that the virtual image plane moves between the two focal planes, and visual fatigue caused by focusing convergence of the human eyes is weakened.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and more specifically, to an optical structure, a display device, and an optical system. Background Art

[0002] As an advanced driver assistance system, head-up display (HUD) has been widely used in the market in recent years. However, in HUD, since the image is usually projected at a fixed distance in front of the driver's line of sight, and when the driver tries to view objects at different distances, the eyeball will try to adjust the focal length and convergence angle, but the fixed focal plane of HUD makes this adjustment inconsistent with the actual object, thus causing focus and convergence conflicts.

[0003] The above problem also exists in virtual reality (VR) or augmented reality (AR) glasses. The user's left and right eyes receive images with parallax respectively, and the image parallax is interpreted by the brain as depth information, thereby constructing the perception of three-dimensional space. However, when the user tries to view objects of different depths in the virtual world, although the brain processes the parallax information to perceive the depth, the lens of the eye cannot adjust the focal length accordingly, and although the brain perceives the distance of the virtual object through the parallax information, the human eye is actually converging on the screen at a fixed distance, resulting in inconsistency between the convergence angle and the actual distance of the virtual object, thus causing focus and convergence conflict. Summary of the invention

[0004] The present application provides an optical structure, a display device and an optical system, which can realize the display of two focal planes through one 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 the visual fatigue caused by the focusing convergence of the human eye.

[0005] In a first aspect, an optical structure is provided, which is arranged on a display screen, and the optical structure includes: a liquid crystal wave plate, located on one side of the light-emitting surface of the display screen; a dichroic film, located on the side of the liquid crystal wave plate away from the display screen; a quarter wave plate, located on the side of the dichroic film 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 combination with the first aspect, in certain implementations of the first aspect, when the light emitted by the display screen is non-polarized light, the optical structure further includes: a polarizer located between the liquid crystal wave plate and the display screen.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the liquid crystal wave plate is used to modulate linearly polarized light into elliptically polarized light, wherein the elliptically polarized light includes a first linearly polarized light and a 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 dichroic film is used to transmit a first part of the elliptically polarized light and reflect a second part of the elliptically polarized light; the quarter wave plate is used to convert linearly polarized light into circularly polarized light; and the reflective polarizer is used to reflect the first linearly polarized light and transmit the second linearly polarized light, or to reflect the second linearly polarized light and project the first linearly polarized light.

[0008] In combination with the first aspect, in certain implementations of the first aspect, 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 beam splitter film, and / or between the beam splitter film and the quarter wave plate, and / or between the quarter wave plate and the reflective polarizer.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the optical structure is used to generate a first image and a second image, the first image is imaged on a first focal plane, the second image is imaged on a second focal plane, and the distance between the first focal plane and the second focal plane is equal to the distance between the reflective polarizer and the dichroic film.

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

[0011] In combination with the first aspect, in certain implementations of the first aspect, the optical structure further includes: a voltage controller, the voltage controller is connected to the liquid crystal wave plate, and the voltage controller is used to send a voltage signal to the liquid crystal wave plate.

[0012] In combination with the first aspect, in some implementations of the first aspect, the voltage controller includes: an adjustment control, which is used to adjust the voltage signal.

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

[0014] In a third aspect, an optical system is provided, including a display screen, an optical structure in any possible implementation of the optical structure design of the first aspect, a lens, and a reflector group, wherein the reflector group is used to reflect light from the optical structure to the lens. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 is a light transmission schematic diagram of an optical structure 100 proposed in an embodiment of the present application;

[0017] Figure 3 is a schematic diagram of an optical structure forming two focal planes proposed in an embodiment of the present application;

[0018] Figure 4 is a principle diagram of an optical structure forming a virtual image surface proposed in an embodiment of the present application;

[0019] Figure 5 is a schematic diagram of another optical structure 100 proposed in an embodiment of the present application;

[0020] Figure 6 is a schematic diagram of another optical structure 100 proposed in an embodiment of the present application;

[0021] Figure 7 It is a schematic diagram of the architecture of an optical system 200 proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0023] The embodiments of the present application will present various aspects, embodiments or features around a system including multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all devices, components, modules, etc. discussed in conjunction with the figures. In addition, combinations of these schemes may also be used.

[0024] In addition, in the embodiments of the present application, words such as "exemplary" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0025] The business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the evolution of technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0026] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0027] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can be represented by: including the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers 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 be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0028] In the description of the embodiments of the present application, the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "inside", "outside", "vertical" and "horizontal" are defined relative to the directions or positions of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, rather than indicating or implying that the device or component referred to must have a specific direction, or be constructed and operated in a specific direction. They may change accordingly according to changes in the directions of the components placed in the drawings, and therefore cannot be understood as limitations on the present application.

[0029] In the embodiments of the present application, the same reference numerals are used to represent the same components or parts. For the same parts in the embodiments of the present application, only one of the parts or parts may be marked with a reference numeral in the figure. It should be understood that the reference numerals are also applicable to other identical parts or parts. In addition, the various parts in the drawings are not drawn to scale, and the sizes and dimensions of the parts shown in the drawings are only exemplary and should not be understood as limiting the present application.

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

[0031] As for HUD, HUD is usually used in the cockpit display system of the vehicle, but HUD usually has only one focal plane. This design feature will cause focusing and convergence conflicts during human eye use. The reasons are as follows:

[0032] In order to see objects clearly, the human eye needs to adjust the shape of the lens so that the light can be accurately focused on the retina. This process is called "focusing" or "accommodation". In the process of the human eye naturally viewing the surrounding environment, when viewing objects at different distances, the lens of the eye will automatically adjust the focal length to adapt to the distance of the object. However, in HUD, since the image is usually projected at a fixed distance in front of the driver's line of sight (that is, the single focal plane mentioned above), no matter how the actual road conditions change, the lens of the driver's eye needs to maintain the same focal length, resulting in a focusing conflict, that is, the driver's eyes try to adjust the focal length to adapt to the distance of the virtual image, but in fact this distance is fixed and does not match the actual road conditions.

[0033] In addition, convergence refers to the angle at which both eyes turn inward in order to focus on the same object. When the human eye naturally views the surrounding environment, the eyes will automatically adjust the convergence angle according to the distance of the object to ensure that the eyes' line of sight converge on the object, thereby avoiding ghosting. However, in HUD, since the virtual image is at a fixed distance, the convergence angle of the eyes also needs to be maintained at this distance. However, when the driver views the real road conditions, the human eye will also automatically adjust the convergence angle according to the distance of the actual object, resulting in a convergence conflict, that is, the driver's eyes try to adjust the convergence angle to adapt to the real road conditions, but at the same time keep focusing on the HUD image.

[0034] In order to solve the above problems, although it is possible to use two sets of optical machines or two screen displays in the HUD, such a design will greatly increase the size of the HUD and increase the manufacturing cost, making it difficult to popularize and promote.

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

[0036] However, in VR glasses or AR glasses, since the images are usually projected on a display screen close to the eyes, the lens of the eye is forced to maintain a fixed focal length for a long time to adapt to the virtual image on the display screen. When the user tries to view objects of different depths in the virtual world, although the brain perceives the depth based on the parallax information, the lens of the eye cannot adjust the focal length accordingly, resulting in a mismatch between the visual information and the actual state of the eye muscles, resulting in a focusing conflict.

[0037] In addition, in VR glasses 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 inconsistency between the convergence angle and the actual distance of the virtual object, thus causing convergence conflict.

[0038] When the above-mentioned focusing conflict and convergence conflict act together on the human visual system, it will cause visual discomfort and fatigue, affecting the user's experience of using the corresponding product.

[0039] In view of this, an embodiment of the present application proposes an optical structure that can realize the display of two focal planes through one 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 the visual fatigue caused by the focusing convergence of the human eye.

[0040] Figure 1 It is a schematic diagram of an optical structure 100 proposed in an embodiment of the present application.

[0041] refer to Figure 1 As shown, the optical structure 100 is disposed on a 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 light splitting film 130 is located on a side of the liquid crystal wave plate 120 away from the display screen 110;

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

[0045] The reflective polarizer 150 is located on a 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 may be a display screen capable of emitting non-polarized light.

[0047] Among them, the display screen that can emit polarized light can be: a digital light processing (DLP) display screen, a liquid crystal on silicon (LCOS) display screen, an organic light-emitting diode (OLED) display screen or a micro light-emitting diode (micro-LED) display screen, etc.; the display screen that can emit non-polarized light can be: a liquid crystal display (LCD), etc.

[0048] In some possible embodiments, when the light emitted by the display screen 110 is non-polarized light, the optical structure 100 may further include: a polarizer 160 , wherein the polarizer 160 is located between the liquid crystal wave plate 120 and the display screen 110 .

[0049] Based on the above-mentioned design of the display screen 110 and the combined design of the display screen 110 and the polarizing plate 160 , the liquid crystal wave plate 120 can receive polarized light and thus perform corresponding actions on the polarized light.

[0050] In some possible embodiments, the liquid crystal wave plate 120 is used to modulate linearly polarized light into elliptically polarized light, which elliptically polarized light includes a first linearly polarized light and a 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 a first part of the elliptically polarized light and reflect a 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, in the same optical structure 100, the function of the reflective polarizer 150 can be one of the two functions proposed in the above embodiments, that is, when the reflective polarizer 150 can reflect the first linear polarized light, it can only transmit the second polarized light; when the reflective polarizer 150 can project the first linear polarized light, it can only reflect the second polarized light. The above polarization characteristics of the reflective polarizer 150 are related to the patch direction of the reflective polarizer 150.

[0052] For example, the first linear polarized light may be understood as parallel (P) linear polarized light, and the second linear polarized light may be understood as perpendicular (S) linear polarized light.

[0053] It should be understood that when light penetrates 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 vibration direction of the electric vector of the light wave) is located in the plane defined by the incident light and the reflected light (or refracted light), then this polarized light is called P linear polarized light and can be used as the first linear polarized light mentioned above; in contrast to P linear polarized light, if the polarization vector of the light is perpendicular to the above-defined plane, then this polarized light is called S linear polarized light and can be used as the second linear polarized light mentioned above.

[0054] It should be noted that the difference between the above-mentioned splitter film 130 and the reflective polarizer 150 is that the reflection and transmission of the splitter film 130 does not distinguish between the first linear polarized light and the second linear polarized light. When the elliptically polarized light including the above-mentioned first linear polarized light and the second linear polarized light is incident on the splitter film 130, it does not only transmit the first linear polarized light and reflect the second linear polarized light, or only transmit the second linear polarized light and reflect the first linear polarized light, but transmits a part of the first linear polarized light and a part of the second linear polarized light, and reflects another part of the first linear polarized light and another part of the linear polarized light.

[0055] In some possible embodiments, the liquid crystal wave plate 120 is configured to adjust the light amount of the first linear polarized light and the light amount of the second linear polarized light in the elliptically polarized light based on the received voltage signal, so as to achieve the acquisition of multiple virtual image planes.

[0056] Based on the above technical solution, by arranging the linear polarizer, liquid crystal glass, dichroic film, quarter wave plate, and reflective polarizer in a specific order, the obtained 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, and by driving and controlling the liquid crystal wave plate, the image brightness on the two focal planes can be adjusted, and then the virtual image distance can be adjusted between the two focal planes, that is, the virtual image plane is moved between the two focal planes, thereby reducing the visual fatigue caused by the focusing convergence of the human eye.

[0057] For ease of understanding, the principle by which the optical structure 100 can form two focal planes is described below:

[0058] Figure 2 It is a schematic diagram of light transmission of an optical structure 100 proposed in an embodiment of the present application.

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

[0060] After the light from the display screen 110 passes through the polarizer 160, it is converted into linear polarized light (in this example, it is assumed that the linear polarized light is P linear polarized light). After the P linear polarized light passes through the liquid crystal wave plate 120, it is converted into elliptically polarized light. After the elliptically polarized light passes through the beam splitter 130 and the quarter wave plate 140 in sequence, it is incident on the reflective polarizer 150. At this time, based on the effect of the reflective polarizer 150 on the elliptically polarized light, the P linear polarized light in the elliptically polarized light is transmitted (this part of the light is in the Figure 2 In the figure, it is denoted as ray1), and the S linear polarized light in the elliptically polarized light is reflected (this part of the light is in Figure 2 In Chinese, it is written as ray2);

[0061] After the reflected part of the S linear polarized light passes through the quarter wave plate 140 again, this part of the S linear 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 linear polarized light into right-handed circularly polarized light). After the circularly polarized light passes through the beam splitting film 130, part of the circularly polarized light is reflected, and the reflected part of the circularly polarized light becomes left-handed circularly polarized light.

[0062] The left-handed circularly polarized light is converted into P linearly polarized light after passing through the quarter wave plate 140. At this time, the P linearly polarized light is directly transmitted after passing through the reflective polarizer 150 (this part of the light is Figure 2 (denoted as ray3).

[0063] Figure 3 This is a schematic diagram of an optical structure proposed in an embodiment of the present application to form two focal planes.

[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, wherein the focal length f′ of the lens is fixed, so changing the object distance l can change the image distance l′, and the image is imaged 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 the embodiment of the present application is used to generate a first image and a second image, the first image is imaged on the first focal plane 01, the second image is imaged on the second focal plane 02, and 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 splitter film 130.

[0066] The first focal plane 01 may be the far focal plane proposed in the above embodiment, and the second focal plane 02 may 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 the present application are relatively thin, and even the thickness of some devices can be ignored, the distance between the above-mentioned reflective polarizer 150 and the splitter film 130 may refer to the distance from the lower surface of the reflective polarizer 150 to the upper surface of the splitter film 130, or the distance from the lower surface of the reflective polarizer 150 to the lower surface of the splitter film 130, or the distance from the upper surface of the reflective polarizer 150 to the upper surface of the splitter film 130, or the distance from the upper surface of the reflective polarizer 150 to the upper surface of the splitter film 130, or the distance from the upper surface of the reflective polarizer 150 to the lower surface of the splitter film 130.

[0068] refer to Figure 3 As shown, the ray1 and the ray3 are incident on the lens group of the optical system in sequence, such as the lens group or the reflector group of the HUD, the lens group or the reflector group of the VR device or the AR device. Since the optical paths of ray1 and ray3 are different, the virtual image distances of the images generated based on ray1 and ray3 are different, corresponding to the two focal planes. Figure 3 In the figure, the two focal planes are respectively recorded as the near focal plane and the far focal plane, where 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 eyes. As for the near focal plane, if the image is formed on the near focal plane, it is equivalent to moving the display screen 110 toward Figure 3 The right side is zoomed out as shown, and the zoomed-out position can be understood as an equivalent position of the display screen 110, but in fact, ray1 and ray3 are both emitted by the display screen 110 at the actual position.

[0070] In addition, for the two focal planes formed by the optical structure 100 proposed in the embodiment of the present application, based on the brightness of the images presented by the two focal planes, multiple virtual image planes that can be perceived by the human eye can be obtained. The principle is as follows:

[0071] Figure 4 This is a schematic diagram of a virtual image plane formed by an optical structure proposed in an embodiment of the present application.

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

[0073] The position of the virtual image plane is generally located between the two focal planes, but the specific corresponding position 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 light amount of ray1 and ray3.

[0074] After the linear polarized light passes through the liquid crystal wave plate 120, it can obtain elliptically polarized light with different light amounts of the first linear polarized light and the second linear polarized light, that is, ray1 and ray3 of different energies (or light amounts) will be obtained in the end, and the phase of the liquid crystal wave plate 120 can be controlled by a voltage signal, so that the energy of ray1 and ray3 can be adjusted, that is, the brightness of the virtual image (or simply virtual image) generated based on ray1 and the virtual image generated based on ray3 can be adjusted. At this time, the imaging position of the virtual image formed by the superposition of ray1 and ray3 perceived by both eyes is located between the two focal planes (respectively recorded as the near focal plane and the far focal plane), but the specific position is determined by the image brightness corresponding to the two virtual images, that is, there is a corresponding relationship between the depth of the depth of field of the superimposed virtual image perceived by the human eye and the brightness of the two virtual images. This corresponding relationship can be referred to Figure 4 Based on this, by controlling the light amount ratio of P linear polarized light to S linear polarized light in the elliptically polarized light converted by the liquid crystal wave plate 120, the image brightness of the virtual images presented on the two focal planes can be adjusted, so that the human eye can obtain virtual images of different depths, that is, the virtual images can be imaged on virtual image planes at different positions.

[0075] Figure 5 It is a schematic diagram of another optical structure 100 proposed in an embodiment of the present application.

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

[0077] The voltage controller 180 is connected to the liquid crystal wave plate 120 , and is used to send a voltage signal to the liquid crystal wave plate 120 .

[0078] In some possible embodiments, the voltage controller 180 may include: an adjustment control 181 , and the adjustment control 181 is used to adjust the voltage signal.

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

[0080] In some possible embodiments, the adjustment control 181 may also be a device wirelessly connected to the voltage controller 180 , and the device drives the voltage controller 180 to output a voltage signal corresponding to the voltage value through a wireless signal.

[0081] Based on the above technical solution, the voltage control of the liquid crystal wave plate 120 in the optical structure 100 can be achieved, so that the liquid crystal wave plate 120 can process the polarized light to obtain elliptically polarized light including the first linear polarized light and the second linear polarized light with different light amounts, and finally virtual images of different brightness can be formed on the two focal planes. Combined with the mechanism of the human visual system for 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 devices in the optical structure 100 are relatively thin and prone to bending, a glass substrate 170 may be provided in the optical structure 100 between the display screen 110 and the liquid crystal wave plate 120, and / or between the liquid crystal wave plate 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 devices and avoid bending.

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

[0084] Figure 6 A schematic diagram of another optical structure 100 proposed in an embodiment of the present application.

[0085] refer to Figure 6 As shown in (a) in the figure, three glass substrates 170 are introduced into the optical structure 100, namely 170-1, 170-2 and 170-3, wherein the glass substrate 170-1 is located between the reflective polarizer 150 and the quarter-wave plate 140, and is tightly attached to the reflective polarizer 150 and the quarter-wave plate 140; the glass substrate 170-2 is located between the spectroscopic film 130 and the liquid crystal wave plate 120, and is tightly attached to the spectroscopic film 130 and the liquid crystal wave plate 120; the glass substrate 170-3 is located between the liquid crystal wave plate 120 and the polarizer 160, and is tightly 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, wherein the glass substrate 170-3 is located between the beam splitter film 130 and the quarter wave plate 140, and is tightly attached to the beam splitter film 130 and the quarter wave plate 140; the glass substrate 170-5 is located between the beam splitter film 130 and the liquid crystal wave plate 120, and is only tightly attached to the liquid crystal wave plate 120, and a certain gap is set between the glass substrate 170-5 and the beam splitter film 130; the glass substrate 170-6 is located between the liquid crystal wave plate 120 and the polarizer 160, and is tightly attached to the liquid crystal wave plate 120 and the polarizer 160.

[0087] As for the number, location and thickness of the glass substrates 170 , they can be adaptively adjusted according to different product application scenarios, which are listed in detail here.

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

[0089] In addition, an embodiment of the present application further proposes a display device, which includes a display screen and any optical structure 100 proposed in the embodiment of the present application.

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

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

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

[0093] Display screen 110;

[0094] Any optical structure 100 proposed in the embodiments of the present application;

[0095] Lens 210;

[0096] The reflector assembly 220 is used to reflect the light from the optical structure 100 ( Figure 6 The first image and the second image are respectively imaged on the first focal plane 01 and the second focal plane 02 located behind the lens.

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

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

[0099] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0100] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical structure, characterized in that: Set on the display screen, the optical structure includes: A liquid crystal wave plate, located on one side of the light emitting surface of the display screen; A beam splitter film, located on a side of the liquid crystal wave plate away from the display screen; A quarter wave plate, located on a side of the beam splitter film away from the display screen; The reflective polarizer is located on a side of the quarter wave plate away from the display screen.

2. The optical structure according to claim 1, characterized in that: In the case where the light emitted by the display screen is non-polarized light, the optical structure further includes: A polarizing plate is located between the liquid crystal wave plate and the display screen.

3. The optical structure according to claim 1 or 2, characterized in that: The liquid crystal wave plate is used to modulate linear polarized light into elliptically polarized light, wherein the elliptically polarized light includes a first linear polarized light and a second linear polarized light, wherein the polarization directions of the first linear polarized light and the second linear polarized light are perpendicular to each other, and the light amounts of the first linear polarized light and the second linear polarized light are different; The beam splitter film 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 is used to convert linearly polarized light into circularly polarized light; The reflective polarizer is used to reflect the first linear polarized light and transmit the second linear polarized light, or reflect the second linear polarized light and project the first linear polarized light.

4. The optical structure according to any one of claims 1 to 3, characterized in that: 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 beam splitter film, and / or between the beam splitter film and the quarter wave plate, and / or between the quarter wave plate and the reflective polarizer.

5. The optical structure according to any one of claims 1 to 4, characterized in that: The optical structure is used to generate a first image and a second image, the first image is imaged on a first focal plane, the second image is imaged on a second focal plane, and the distance between the first focal plane and the second focal plane is equal to the distance between the reflective polarizer and the beam splitter film.

6. The optical structure according to any one of claims 3 to 5, characterized in that: The liquid crystal wave plate is configured to adjust the light amount of the first linear polarized light and the light amount of the second linear polarized light in the elliptically polarized light based on the received voltage signal.

7. The optical structure according to claim 6, characterized in that: The optical structure also includes: A voltage controller is connected to the liquid crystal wave plate, and is used to send the voltage signal to the liquid crystal wave plate.

8. The optical structure according to claim 7, characterized in that: The voltage controller comprises: An adjustment control is used to adjust the voltage signal.

9. A display device, characterized in that: include: Display screen; An optical structure as claimed in any one of claims 1 to 8.

10. An optical system, characterized in that: include: Display screen; The optical structure according to any one of claims 1 to 8; lens; A reflector group, wherein the reflector group is used to reflect the light from the optical structure to the lens.

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