Display device and head-mounted display apparatus

Abstract

A display device (100) and a head-mounted display apparatus. The display device (100) comprises: an image source (110), a polarizer, a first quarter-wave plate (121), a semi-transparent and semi-reflective face (122), a second quarter-wave plate (123) and a reflective polarizer (124), which are arranged in the direction from an image side to a human eye, wherein the image source (110) comprises a first display screen (111) and a second display screen (112), a display face of the first display screen (111) and a display face of the second display screen (112) are inclined relative to each other, and the second quarter-wave plate (123), the reflective polarizer (124), and the semi-transparent and semi-reflective face (122), which consists of a first outward convex surface (1221) and a second outward convex surface (1222), are all common parts.

Description

Display device and head-mounted display device

[0001] This application claims priority to a Chinese patent application filed with the Patent Office of China on December 11, 2023, with application number 202311696458.0 and application name “A display device and head-mounted display device,” all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optical technology, and in particular to a display device and a head-mounted display apparatus. Background Art

[0003] Virtual reality (VR) display devices can virtually display simulated environments to give people an immersive experience.

[0004] The optical module of a VR display device uses a lens system or a prism optical system to magnify the image on the display device and project it onto the human eye's retina, ultimately presenting the viewer with a large-screen image with a certain sense of distance. To provide a good user experience, a wide field of view, high image quality, and a small size are required.

[0005] However, existing VR display devices generally have problems such as a too small FoV (Field of view) or a large size of the VR device when the FoV is large, which limits the application of head-mounted display devices.

[0006] Summary of the Invention

[0007] The present application provides a display device and a head-mounted display device to improve the use effect of the display device.

[0008] The present application provides a display device, which includes:

[0009] An image source, a polarizing polarizer, a first quarter-wavelength phase plate, a partially transmissive and partially reflective surface, a second quarter-wavelength phase plate, and a reflective polarizer are arranged along the direction from the image side to the human eye; wherein,

[0010] The image source includes a first display screen and a second display screen; the first display screen and the second display screen each correspond to one of the first quarter-wavelength phase plates; wherein the display surface of the first display screen and the display surface of the second display screen are both oriented toward the same pupil of the user and are tilted relative to each other;

[0011] The partially transmissive and partially reflective surface includes a first convex surface corresponding to the first display screen and a second convex surface corresponding to the second display screen; wherein the convex direction of the first convex surface is toward the first display screen; the convex direction of the second convex surface is toward the second display screen;

[0012] The reflective polarizer can transmit polarized light in a first polarization direction and reflect polarized light in a second polarization direction; and the first polarization direction is perpendicular to the second polarization direction;

[0013] The light emitted by the first display screen passes through the first convex surface, the second quarter-wavelength phase plate, and the reflection and transmission folded light path of the reflective polarizer;

[0014] The light emitted by the second display screen passes through the second convex surface, the second quarter-wavelength phase plate and the reflection and transmission folded light path of the reflective polarizer.

[0015] In the above technical solution, the picture is displayed by two relatively inclined first and second display screens. The light emitted by the first and second display screens is folded by the polarization polarizer, the first quarter-wave phase plate, the partially transmissive and partially reflective surface, the second quarter-wave phase plate and the reflective polarizer to form a spliced ​​image, thereby providing a larger field of view, simplifying the structure of the display device, and facilitating miniaturization.

[0016] In a specific embodiment, the reflective polarizer is planar or aspherical.

[0017] In a specific embodiment, the reflective polarizer is an asymmetric free-form surface.

[0018] In a specific embodiment, a lens is further included; the lens is located between the first quarter-wavelength phase plate and the second quarter-wavelength phase plate; wherein,

[0019] The surface of the lens facing the first quarter-wavelength phase plate includes the first convex surface and the second convex surface;

[0020] The second quarter-wavelength phase plate is fixed to an end of the lens away from the first quarter-wavelength phase plate.

[0021] In a specific embodiment, the second quarter-wavelength phase plate is integrally formed with the lens; or

[0022] The second quarter-wavelength phase plate is bonded to the lens.

[0023] In a specific embodiment, the first convex surface is an aspherical surface; and the second convex surface is an asymmetric free-form surface.

[0024] In a specific embodiment, the first outer convex surface is an asymmetric free-form surface.

[0025] In a specific implementation manner, the first display screen and the second display screen are arranged along the direction of the user's eyes, and the second display screen is located on a side close to the user's auricle.

[0026] In a specific implementation manner, the display surface of the second display screen is tilted relative to the display surface of the first display screen and is tilted toward the user, and the angle between the display surface of the first display screen and the display surface of the second display screen is ≥5°.

[0027] In a second aspect, a near-eye display device is provided, comprising a frame and any one of the display devices described above; wherein,

[0028] The display device is fixed to the mirror frame.

[0029] In the above technical solution, the picture is displayed by two relatively inclined first and second display screens. The light emitted by the first and second display screens is folded by the polarization polarizer, the first quarter-wave phase plate, the partially transmissive and partially reflective surface, the second quarter-wave phase plate and the reflective polarizer to form a spliced ​​image, thereby providing a larger field of view, simplifying the structure of the display device, and facilitating miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic diagram of an application scenario of a display device provided in an embodiment of the present application;

[0031] FIG2 is a schematic structural diagram of a display device provided in an embodiment of the present application;

[0032] FIG3 is a schematic diagram of image stitching provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0035] To facilitate understanding of the display device provided by the embodiment of the present application, its application scenario is first described. The display device provided by the embodiment of the present application is applied to different near-eye display systems such as AR (Augmented Reality, enhanced display technology) or VR (Virtual Reality, virtual display technology) to realize virtual display. However, the current near-eye display system generally has a small field of view angle, or a large field of view angle, but the corresponding equipment is also relatively large. To this end, the embodiment of the present application provides a display device to improve the field of view effect and miniaturization of the display device. It is described in detail below with reference to specific drawings and embodiments.

[0036] First, let's explain the field of view (FOV). In optical engineering, the field of view (FOV) determines the visual range of an optical instrument. The FOV (Field of View) is related to the focal length as follows: Image height = EFL * tan(half FOV), where EFL is the focal length and FOV is the field of view.

[0037] Referring to Figure 1, Figure 1 shows a reference diagram of the use status of the display device 100 provided in an embodiment of the present application. In order to facilitate the description of the display device 100 in this application, some reference directions are defined. For example, the first direction is the arrangement direction of the human eyes. The center point of the line connecting the eye sockets of two human eyes is defined as the reference point O. When the display device 100 is applied to a head-mounted display device, each human eye corresponds to a display device 100. When the two display devices 100 are arranged, their arrangement direction is along the first direction, and they are symmetrically arranged along point O, so that each eye of the user can observe the displayed image through the corresponding display device 100. The structure of the above two display devices 100 is a symmetrical structure, so one of the display devices 100 is taken as an example for detailed description.

[0038] Referring to Figure 2, a schematic diagram of the specific structure of a display device is shown. The display device 100 provided in an embodiment of the present application includes an image source 110 and a folded optical path device 120. The image source 110 is used to provide light for display, while the folded optical path device 120 is used to fold the optical path to reduce the size of the display device 100. Furthermore, the folded optical path device 120 is also used to direct the light emitted by the image source 110 for displaying an image into the human eye. The specific structure of the display device 100 is described in detail below.

[0039] When specifically configuring the image source 110, the image source 110 provided in the embodiment of the present application includes two display screens, which, for ease of description, are named first display screen 111 and second display screen 112. Both first display screen 111 and second display screen 112 are used to display image information. For example, first display screen 111 and second display screen 112 can be different types of display screens, such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode).

[0040] It should be understood that the first display screen 111 and the second display screen 112 are used to display partial information of the desired image information, and the complete image information is formed by splicing the images displayed on the first display screen 111 and the second display screen 112. In actual applications, the image information displayed on the first display screen 111 and the second display screen 112 has some overlap. This overlapping portion is the splicing area when the first display screen 111 and the second display screen 112 are displayed, so as to ensure that the first display screen 111 and the second display screen 112 can form the complete image information.

[0041] When specifically arranging the first display screen 111 and the second display screen 112, they are arranged along a first direction, with the display surfaces of the first display screen 111 and the second display screen 112 both facing the same pupil of the user. Furthermore, the display surfaces of the first display screen 111 and the second display screen 112 are tilted relative to each other, so that the display surfaces of the first display screen 111 and the second display screen 112 both face the user's pupil, making viewing easier for the user. As shown in FIG3 , the area displayed on the first display screen 111 is the primary image area 10, and the area displayed on the second display screen 112 is the secondary image area 30. An image overlap area 20 exists between the primary image area 10 and the secondary image area 30, allowing them to be spliced ​​together to form a complete image.

[0042] When light emitted from the first display screen 111 and the second display screen 112 is transmitted to the human eye, the light propagation is achieved through the folded optical path device 120. In the embodiment of the present application, the folded optical path device 120 includes at least: a polarizing polarizer, a first quarter-wavelength phase plate 121, a partially transmissive and partially reflective surface 122, a second quarter-wavelength phase plate 123, and a reflective polarizer 124. These components are arranged in sequence along the direction of light propagation to transmit light to the user's eyes for image display.

[0043] It should be understood that the quarter-wavelength phase plate provided in the embodiment of the present application refers to a phase plate in which, when light of a certain wavelength is incident vertically, the phase difference between the outgoing ordinary light and the extraordinary light is 1 / 4 wavelength or approximately 1 / 4 wavelength, which meets the requirements of the present application. In the partially transmissive and partially reflective surface, the ratio of transmitted light to reflected light is between 3:7 and 7:3. For example, if the transmitted light is 30%, the reflected light is 70%; or, the transmitted light is 50% and the reflected light is 50%; or, the transmitted light is 70% and the reflected light is 30%.

[0044] For ease of understanding, let's first explain the role of each component in light propagation. The polarization polarizer is used to convert light emitted from the display screen (first display screen 111 or second display screen 112) into linearly polarized light. The first quarter-wavelength phase plate 121 is used to convert linearly polarized light into elliptically polarized light. The second quarter-wavelength phase plate 123 is used to convert linearly polarized light into elliptically polarized light, or vice versa. The reflective polarizer 124 transmits linearly polarized light in a first polarization direction and reflects polarized light in a second polarization direction. The first polarization direction is perpendicular to the second polarization direction.

[0045] During the light propagation process, the light emitted by the display screen is first converted into linearly polarized light by the polarization polarizer, and then converted into elliptically polarized light by the first quarter-wave phase plate 121. The elliptically polarized light propagates to the second quarter-wave phase plate 123 through the partially transmissive and partially reflective surface 122, and is converted from elliptically polarized light to linearly polarized light (polarization direction is the first polarization direction) after passing through the second quarter-wave phase plate 123. The linearly polarized light is then reflected to the second quarter-wave phase plate 123 by the reflective polarizer 124, and is converted from linearly polarized light to elliptically polarized light after passing through the second quarter-wave phase plate 123. After being reflected by the partially transmissive and partially reflective surface 122, the elliptically polarized light passes through the second quarter-wave phase plate 123 again, and is converted from elliptically polarized light to linearly polarized light (second polarization direction) again. The linearly polarized light propagates through the reflective polarizer 124 into the human eye for image display. Among them, the partially transmissive and partially reflective surface 122 also has the function of converging light, so that the image displayed on the display screen is displayed in the human eye.

[0046] It can be seen from the above description that during the propagation of light, the light path is folded by the cooperation of the first quarter-wave phase plate 121, the partially transmissive and partially reflective surface 122, the second quarter-wave phase plate 123 and the reflective polarizer 124, thereby reducing the size of the entire display device 100.

[0047] To further reduce the size of the display device 100, some of the above components are used solely by the first display screen 111 and the second display screen 112, and some are shared by the first display screen 111 and the second display screen 112. This will be described in detail below with reference to the accompanying drawings.

[0048] Continuing with reference to FIG. 2 , when polarizing polarizers are provided, they correspond one-to-one with the display screens. For example, the display surface of the first display screen 111 is provided with a polarizing polarizer for converting light emitted from the first display screen 111 into linearly polarized light. Similarly, the display surface of the second display screen 112 is also provided with a polarizer for converting light emitted from the second display screen 112 into linearly polarized light. It should be understood that when the display surfaces of the first display screen 111 and the second display screen 112 are arranged at an angle relative to each other, the two polarizing polarizers corresponding to the first display screen 111 and the second display screen 112 are also arranged at an angle relative to each other.

[0049] The first quarter-wavelength phase plate 121 is also provided in a one-to-one correspondence with the display screen. For example, the display surface of the first display screen 111 is further provided with a first quarter-wavelength phase plate 121. The first quarter-wavelength phase plate 121 and the polarizing polarizer are aligned along the propagation direction of light. Linearly polarized light converted by the polarizing polarizer is then converted into elliptically polarized light after passing through the first quarter-wavelength phase plate 121.

[0050] Similarly, the display surface of the second display screen 112 is also provided with a first quarter-wave phase plate 121. The first quarter-wave phase plate 121 is also arranged along the propagation direction of the polarization polarizer and converts the linearly polarized light converted by the polarization polarizer into elliptically polarized light.

[0051] It should be understood that when the display surfaces of the first display screen 111 and the second display screen 112 are relatively tilted, the two first quarter-wavelength phase plates 121 corresponding to the first display screen 111 and the second display screen 112 are also relatively tilted.

[0052] The partially transmissive and partially reflective surface 122 is a shared component that works with the reflective polarizer 124 to fold the light path. When the partially transmissive and partially reflective surface 122 is shared, it has two different surfaces corresponding to the first display screen 111 and the second display screen 112, respectively, and transmits light emitted from the first display screen 111 and the second display screen 112 through the two different surfaces.

[0053] Specifically, the partially transmissive and partially reflective surface 122 includes a first convex surface 1221 and a second convex surface 1222. The first convex surface 1221 corresponds to the first display screen 111, while the second convex surface 1222 corresponds to the second display screen 112. When the first convex surface 1221 and the second convex surface 1222 are specifically arranged, the convex direction of the first convex surface 1221 is toward the first display screen 111, and the convex direction of the second convex surface 1222 is toward the second display screen 112. This allows the sides of the first convex surface 1221 and the second convex surface 1222 facing away from the first display screen 111 and the second display screen 112 to form a concave surface, thereby converging the reflected light.

[0054] As an optional solution, the specific configuration of the first convex surface 1221 and the second convex surface 1222 can be achieved in various ways. For example, the folded optical path device 120 further includes a lens 125 positioned between the first quarter-wavelength phase plate 121 and the second quarter-wavelength phase plate 123. The surface of the lens 125 facing the first quarter-wavelength phase plate 121 includes the first convex surface 1221 and the second convex surface 1222.

[0055] As shown in FIG2 , the side of the lens 125 facing the two first quarter-wavelength phase plates 121 has an arc-shaped convex structure that protrudes outward toward the two first quarter-wavelength phase plates 121. The surfaces of the two arc-shaped convex structures are respectively a first convex surface 1221 and a second convex surface 1222. The first convex surface 1221 and the second convex surface 1222 are both semi-transmissive and semi-reflective surfaces, so that light emitted from the first display screen 111 and the second display screen 112 can pass through the first convex surface 1221 and the second convex surface 1222, respectively, and light reflected back from the reflective polarizer 124 can be reflected back to the reflective polarizer 124 through the first convex surface 1221 and the second convex surface 1222, thereby achieving light folding.

[0056] The lens 125 is a one-piece lens, that is, two curved convex structures are formed on a single lens to form a first convex surface 1221 and a second convex surface 1222. Alternatively, the lens 125 is a single spliced ​​lens. For example, the lens 125 can be formed by splicing two lenses arranged along a first direction. One of the lenses has a curved convex structure to form the first convex surface 1221; the other lens has a curved convex structure to form the second convex surface 1222. After the two lenses 125 are spliced ​​and fixed, the shape of the lens 125 shown in Figure 2 is formed.

[0057] It should be understood that, in addition to using the surface of the lens 125 as the two convex surfaces (the first convex surface 1221 and the second convex surface 1222 ), convex surfaces may also be formed by other methods, which will not be described in detail in the embodiments of the present application.

[0058] The first convex surface 1221 and the second convex surface 1222 need to converge the light when processing it. Therefore, when providing the first convex surface 1221 and the second convex surface 1222, the first convex surface 1221 can be an aspherical surface to achieve a better imaging effect than a spherical surface.

[0059] Exemplarily, the first convex surface 1221 may be an asymmetric free-form surface. When an asymmetric free-form surface is used, a smaller spatial envelope can be achieved, making the lens lighter. In addition, geometric aberrations can be reduced, and optical performance (such as image quality, depth of field, field of view, etc.) can be better improved through balance and control. At the same time, when an asymmetric free-form surface is used, the number of lenses used can be reduced, thereby reducing the volume of the display device 100. Of course, in addition to the asymmetric free-form surfaces in the above examples, other aspherical surfaces can also be used as the first convex surface 1221. In the embodiments of the present application, it is not limited to the asymmetric free-form surfaces in the above examples.

[0060] The second convex surface 1222 also adopts an asymmetric free-form surface, which can also obtain better optical performance and reduce the volume of the display device 100. For details, please refer to the above description of the first convex surface 1221.

[0061] It should be understood that when the first convex surface 1221 and the second convex surface 1222 are specifically configured, the first convex surface 1221 and the second convex surface 1222 are also relatively inclined surfaces to correspond to the first display screen 111 and the second display screen 112. For example, when the first convex surface 1221 and the second convex surface 1222 are both asymmetric free-form surfaces, based on the user's head features, the asymmetric free-form surface of the first convex surface 1221 is inclined away from the ears, while the asymmetric free-form surface of the second convex surface 1222 is inclined toward the ears.

[0062] As an example, referring to Table 1, Table 1 illustrates specific parameter information of the first convex surface and the second convex surface.

[0063] Table 1

[0064] Among them, the formula The letters in represent: Z represents the height in the direction of the optical axis, c is the inverse of the surface radius, k is the conic surface coefficient, r is the diameter in the radial direction, and is the square root of the sum of the squares of the x and y coordinates. N is the total number of polynomial coefficients in the series, and Ai is the coefficient of the i-th expanded polynomial.

[0065] It should be understood that the above Table 1 is an example of a specific asymmetric free-form surface provided in the present application. The specific shapes of the first convex surface 1221 and the second convex surface 1222 provided in the embodiment of the present application are not limited to the examples in Table 1. Other asymmetric free-form surfaces can also be used, which will not be exemplified one by one in the embodiments of the present application.

[0066] The second quarter-wavelength phase plate 123 is a common component. Light emitted from the first display screen 111 and the second display screen 112 all pass through the second quarter-wavelength phase plate 123. The second quarter-wavelength phase plate 123 converts linearly polarized light into elliptically polarized light, or vice versa.

[0067] In a specific configuration, the side of the lens 125 facing away from the first quarter-wavelength phase plate 121 is a plane, and the second quarter-wavelength phase plate 123 is fixed to the end of the lens 125 facing away from the first quarter-wavelength phase plate 121, so as to support the second quarter-wavelength phase plate 123 through the lens 125. For example, the second quarter-wavelength phase plate 123 can be bonded to the lens 125, specifically to the end of the lens 125 facing away from the first quarter-wavelength phase plate 121. Alternatively, the second quarter-wavelength phase plate 123 can be fixed to the lens 125 facing away from the first quarter-wavelength phase plate 121 by other means. In addition, the second quarter-wavelength phase plate 123 can be integrally formed with the lens 125, that is, the lens 125 and the second quarter-wavelength phase plate 123 can be integrally manufactured, thereby making the components more compact.

[0068] When the above-described arrangement of the second quarter-wavelength retardation plate 123 is adopted, the lens 125 can be used as a supporting structure for the second quarter-wavelength retardation plate 123, so that the two components are assembled compactly, thereby reducing the volume of the display device 100. Of course, in addition to the above-described arrangement of the second quarter-wavelength retardation plate 123, other fixing methods can also be used to fix the second quarter-wavelength retardation plate 123, such as supporting the second quarter-wavelength retardation plate 123 with other supporting structures.

[0069] The reflective polarizer 124 is also a common component that can reflect and transmit light, thereby processing the light emitted by the first display screen 111 and the second display screen 112. The reflective polarizer 124 is a continuous polarizer, without the partitions (first convex surface 1221 and second convex surface 1222) found in the partially transmissive and partially reflective surface 122. This ensures the continuity of light emitted from the first display screen 111 and the second display screen 112 when it strikes the reflective polarizer 124, thereby reducing the difficulty of stitching the images displayed on the first display screen 111 and the second display screen 112.

[0070] When the reflective polarizer 124 is specifically configured, the reflective polarizer 124 can be a plane or an aspheric surface, that is, the reflective polarizer 124 is a continuous plane or a continuous aspheric surface. For example, when the reflective polarizer is a continuous plane, the reflective polarizer 124 is only used to reflect or transmit the light that passes through the second quarter-wavelength phase plate 123 and does not participate in focusing the light. As shown in FIG2 , when the reflective polarizer 124 is a continuous aspheric surface, when the light propagates between the reflective polarizer 124 and the partially transmissive and partially reflective surface 122, the light reflected by the reflective polarizer and the light reflected by the convex surface (the first convex surface 1221 or the second convex surface 1222) will converge, that is, the reflective polarizer 124 can also cooperate with the partially transmissive and partially reflective surface 122 to achieve focusing of the light.

[0071] As an optional solution, when the reflective polarizer 124 is an aspheric surface, it can be an asymmetric free-form surface. When the reflective polarizer 124 adopts an asymmetric free-form surface, a smaller spatial envelope can be achieved, making the lens lighter. In addition, geometric aberrations can be reduced, and optical performance (such as image quality, depth of field, field of view, etc.) can be better improved through balance and control. At the same time, when an asymmetric free-form surface is adopted, the number of lenses used can be reduced, thereby reducing the volume of the display device 100. Of course, in addition to the asymmetric free-form surfaces in the above examples, the reflective polarizer 124 can also adopt other aspheric surfaces, and the embodiments of the present application are not limited to the asymmetric free-form surfaces in the above examples.

[0072] As can be seen from the above example, the light emitted by the first display screen 111 passes through the polarization polarizer, the first quarter-wavelength phase plate 121, the first convex surface 1221, the second quarter-wavelength phase plate 123, and the reflective polarizer 124. The light emitted by the second display screen 112 passes through the polarization polarizer, the first quarter-wavelength phase plate 121, the second convex surface 1222, the second quarter-wavelength phase plate 123, and the reflective polarizer 124. The specific polarization conversion of the light during propagation can be referred to the description above and will not be repeated here. The second quarter-wavelength plate, the reflective polarizer 124, and the partially transmissive and partially reflective surface 122 composed of the first convex surface 1221 and the second convex surface 1222 are all shared components, simplifying the structure of the display device 100, thereby reducing the size of the display device 100 and facilitating miniaturization. Furthermore, the images provided by the first display screen 111 and the second display screen 112 provide a larger field of view. This results in a display device 100 with a larger field of view and a smaller size.

[0073] As an optional solution, when specifically setting up the first display screen 111 and the second display screen 112, one of the display screens can be used as the main display screen and the other as the secondary display screen. For example, the first display screen 111 can be used as the main display screen and the second display screen 112 can be used as the secondary display screen. When the first display screen 111 and the second display screen 112 are arranged along the user's binocular arrangement direction (first direction), the first display screen 111 is closer to the reference point O than the second display screen 112. That is, the first display screen 111 is relatively close to the user's nose bridge, while the second display screen 112 is located closer to the user's auricle. As a result, the first display screen 111, as the main display screen, is located in the middle area of ​​the user's field of view, while the second display screen 112 is relatively located at the edge area of ​​the user's field of view.

[0074] When specifically configuring the first display screen 111 and the second display screen 112, the display area of ​​the first display screen 111 is larger than that of the second display screen 112. That is, the first display screen 111 displays the majority of the image information, while the second display screen 112 displays the remaining image information. When using this method, the image is divided into a primary image and a secondary image, which are displayed on the primary display screen (the first display screen 111 displays the primary image) and the secondary display screen (the second display screen 112 displays the secondary image). This ensures that the majority of the central visual image area of ​​the human eye is concentrated on the first display screen 111, while some peripheral visual image areas are located on the second display screen 112. Furthermore, because the display area of ​​the first display screen 111 is larger than that of the second display screen 112, the junction between the primary and secondary images is not located in the center of the user's field of view, but rather offset to one side. This makes image defects at the junction less noticeable to the user, improving the user's sensory experience. Furthermore, the image resolutions of the first display screen 111 and the second display screen 112 satisfy the following requirements: the image resolution of the first display screen 111 is not less than that of the second display screen 112. That is, the image resolution of the first display screen 111 is greater than or equal to the image resolution of the second display screen 112. In one possible solution, the image resolution of the first display screen 111 is greater than the image resolution of the second display screen 112. When this image resolution setting is used, since the display image of the second display screen 112 is located at the edge of the user's field of vision, a lower resolution can be used to meet the requirements, thereby increasing the viewing angle range while reducing the power consumption of the entire device.

[0075] It should be understood that when the display area of ​​the first display screen 111 is larger than the display area of ​​the second display screen 112, the size of the corresponding first convex surface 1221 is also larger than the size of the second convex surface 1222, that is, on the side of the lens 125 facing the two display screens, a larger first convex surface 1221 and a smaller second convex surface 1222 are formed to match the light emitted by the first display screen 111 and the second display screen 112.

[0076] Continuing with reference to FIG2 , when the display surface of the first display screen 111 is tilted relative to the display surface of the second display screen 112, the tilt direction of the display surface of the second display screen 112 relative to the display surface of the first display screen 111 is toward the user, and the angle between the display surface of the first display screen 111 and the display surface of the second display screen 112 is ≥5°. Referring to the angle α illustrated in FIG2 , in the embodiment of the present application, the angle α is ≥d°, such as α=5°, 10°, 15°, 20°, 30°, and other different angles. However, it should be understood that the angle α is not infinite, and it should be sufficient to allow the light emitted by the first display screen 111 and the second display screen 112 to converge into the user's eyes for display.

[0077] Taking the first direction as a reference direction, the display surface of the first display screen 111 and the display surface of the second display screen 112 can both be tilted relative to the first direction, or the display surface of the first display screen 111 can be parallel to the first direction, while the display surface of the second display screen 112 can be tilted relative to the first direction.

[0078] When the display surfaces of the first display screen 111 and the second display screen 112 are both tilted relative to the first direction, the display surfaces of the first display screen 111 and the second display screen 112 satisfy the following relationship: the tilt angle of the display surface of the first display screen 111 is less than the tilt angle of the display surface of the second display screen 112. Referring to the tilt angle β of the display surface of the first display screen 111 and the tilt angle γ of the display surface of the second display screen 112 shown in FIG2 , β < γ. For example, β can be 0°, 1°, 3°, 5°, and other angles, while γ can be 10°, 20°, 30°, and other angles.

[0079] An embodiment of the present application further provides a near-eye display device, which includes a frame and any one of the display devices 100 described above; wherein the display device 100 is fixed to the frame.

[0080] In the above technical solution, the picture is displayed by two relatively inclined first display screens 111 and second display screens 112. The light emitted by the first display screen 111 and the second display screen 112 is folded by the polarization polarizer, the first quarter-wavelength phase plate 121, the partially transmissive and partially reflective surface 122, the second quarter-wavelength phase plate 123 and the reflective polarizer 124 to form a spliced ​​image, thereby providing a larger field of view and simplifying the structure of the display device 100, which is convenient for miniaturization.

[0081] The one or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included within the scope of protection of this disclosure.

[0082] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A display device, characterized in that: include: An image source, a polarization polarizer, a first quarter-wavelength phase plate, a partially transmissive and partially reflective surface, a second quarter-wavelength phase plate, and a reflective polarizer are arranged along the direction from the image side to the human eye; wherein, The image source includes a first display screen and a second display screen; the first display screen and the second display screen respectively correspond to one of the first quarter-wavelength phase plates; wherein the display surface of the first display screen and the display surface of the second display screen are both oriented toward the same pupil of the user and are relatively inclined; The partially transmissive and partially reflective surface comprises a first convex surface corresponding to the first display screen and a second convex surface corresponding to the second display screen; wherein the convex direction of the first convex surface faces the first display screen; and the convex direction of the second convex surface faces the second display screen; The reflective polarizer can transmit polarized light in a first polarization direction and reflect polarized light in a second polarization direction; and the first polarization direction is perpendicular to the second polarization direction; The light emitted by the first display screen passes through the first convex surface, the second quarter-wavelength phase plate, and the reflection and transmission folded light path of the reflective polarizer; The light emitted by the second display screen passes through the second convex surface, the second quarter-wave phase plate and the reflection and transmission folded light path of the reflective polarizer.

2. The display device according to claim 1, characterized in that The reflective polarizer is a plane or an aspherical surface.

3. The display device according to claim 2, characterized in that The reflective polarizer is an asymmetric free-form surface.

4. The display device according to claim 2, characterized in that It also includes a lens; the lens is located between the first quarter-wavelength phase plate and the second quarter-wavelength phase plate; wherein, The surface of the lens facing the first quarter-wavelength phase plate includes the first convex surface and the second convex surface; The second quarter-wavelength phase plate is fixed to an end of the lens away from the first quarter-wavelength phase plate.

5. The display device according to claim 4, characterized in that The second quarter-wavelength phase plate is integrally formed with the lens; or, The second quarter-wavelength phase plate is bonded to the lens.

6. The display device according to claim 5, characterized in that The first outer convex surface is an aspherical surface; the second outer convex surface is an asymmetric free-form surface.

7. The display device according to claim 6, characterized in that The first outer convex surface is an asymmetric free-form surface.

8. The display device according to any one of claims 1 to 7, characterized in that: The first display screen and the second display screen are arranged along the direction of the user's eyes, and the second display screen is located on a side close to the user's auricle.

9. The display device according to claim 8, characterized in that The display surface of the second display screen is inclined relative to the display surface of the first display screen in an inclination direction toward the user, and an included angle between the display surface of the first display screen and the display surface of the second display screen is ≥5°.

10. A head mounted display device, characterized in that: It comprises a frame and a display device as claimed in any one of claims 1 to 9; wherein: The display device is fixed to the mirror frame.

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