A near-eye display device

Abstract

This invention discloses a near-eye display device, comprising: a display screen including a central display area and multiple peripheral display areas; a light guide element located on the light-emitting side of the display screen; the light guide element including a light guide element body and multiple light guide structures, the multiple light guide structures being located within the light guide element body, and the multiple light guide structures being arranged one-to-one with the multiple peripheral display areas; the light guide structures are used to guide the light emitted from the corresponding peripheral display areas to the light-emitting area of ​​the central display area for emission, thereby allowing the display images of the peripheral display areas to be superimposed on the area where the display images of the central display area are located, thereby increasing the number of display pixels in the light-emitting area of ​​the central display area and improving the resolution of the display image.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a near-eye display device. Background Technology

[0002] Near-eye displays, also known as head-mounted displays or wearable displays, are technologies that create virtual scenes in front of a person's eyes by placing a display device at a distance from the human eye that is not within direct visual range. They include types such as augmented reality (AR), virtual reality (VR), and mixed reality (MR).

[0003] Near-eye display devices consist of a display screen and imaging optics. Light emitted from the display screen, which is close to the eyes, is imaged at a distance where the human eye can comfortably focus through the imaging optics. Because the human eye's ability to resolve images varies across different viewing angles, with stronger resolution in the central viewing angle range (e.g., less than 3° to 5°), a higher resolution is required from the display screen within this range. However, current technological limitations make it difficult for displays to achieve the required resolution, leading to a screen-door effect that negatively impacts visual experience. Summary of the Invention

[0004] The present invention provides a near-eye display device to improve the resolution of the image displayed in the central area of ​​the near-eye display device, so as to adapt to the resolution capability of the human eye.

[0005] This invention provides a near-eye display device, comprising: a display screen, the display screen including a central display area and a plurality of peripheral display areas;

[0006] A light guide element is located on the light-emitting side of the display screen. The light guide element includes a light guide element body and multiple light guide structures. The multiple light guide structures are located inside the light guide element body, and the multiple light guide structures are arranged in a one-to-one correspondence with the multiple peripheral display areas. The light guide structures are used to guide the light emitted from the corresponding peripheral display areas to the light-emitting area of ​​the central display area for emission.

[0007] In some embodiments of the present invention, the light guide element body includes a light incident surface and a light emitting surface that are parallel to each other;

[0008] The light guide structure includes a first polarization selection layer and a second polarization selection layer. Both the first polarization selection layer and the second polarization selection layer are used to reflect light in a first polarization state and transmit light in a second polarization state. The polarization directions of the light in the first polarization state and the light in the second polarization state are orthogonal.

[0009] The light guide structure is configured such that light emitted from the peripheral display area is incident on the first polarization selection layer and reflected, undergoes multiple total internal reflections between the light incident surface and the light emitting surface, and is then incident on the second polarization selection layer, and is reflected out of the light guide element body by the second polarization selection layer.

[0010] In some embodiments of the present invention, the second polarization selection layers of the plurality of light guide structures are arranged adjacently, and the orthographic projection of each second polarization selection layer on the display screen falls into the central display area.

[0011] In some embodiments of the present invention, the light guide element body includes a plurality of side surfaces, the side surfaces being used to connect the light incident surface and the light emitting surface;

[0012] The first polarization selection layer in each of the light guide structures is disposed near one of the side surfaces of the light guide element body, and the orthographic projection of the first polarization selection layer on the display screen falls into the corresponding peripheral display area.

[0013] In some embodiments of the present invention, there is an angle between adjacent side surfaces, and the first polarization selection layer in each light guide structure is located within one of the angles.

[0014] In some embodiments of the present invention, the plurality of side surfaces include a first side surface and a second side surface disposed opposite to each other, and a third side surface and a fourth side surface disposed opposite to each other; the first side surface and the second side surface are symmetrical about a first axis, and the third side surface and the fourth side surface are symmetrical about a second axis;

[0015] The first polarization selection layer corresponding to the first side surface and the second side surface is located on the second axis, and the first polarization selection layer corresponding to the third side surface and the fourth side surface is located on the first axis.

[0016] In some embodiments of the present invention, both the first polarization selection layer and the second polarization selection layer include reflective polarizers.

[0017] In some embodiments of the present invention, the first polarization selection layer includes a diffraction grating, and the second polarization selection layer includes a reflective polarizer;

[0018] Alternatively, the first polarization selection layer may include a reflective polarizer, and the second polarization selection layer may include a diffraction grating.

[0019] In some embodiments of the present invention, both the first polarization selection layer and the second polarization selection layer include a diffraction grating.

[0020] In some embodiments of the present invention, the near-eye display device further includes: a plurality of first linear polarizers located between the display screen and the light guide element;

[0021] The plurality of first linear polarizers are configured one-to-one with the plurality of peripheral display areas, and the first linear polarizers are used to transmit light in the first polarization state.

[0022] In some embodiments of the present invention, the near-eye display device further includes: a second linear polarizer located between the display screen and the light guide element, wherein the direction of the transmission axis of the second linear polarizer is perpendicular to the direction of the transmission axis of the first linear polarizer;

[0023] The second linear polarizer is disposed at least corresponding to the central display area, and the second linear polarizer is used to transmit light in the second polarization state.

[0024] In some embodiments of the present invention, the near-eye display device further includes:

[0025] A first phase delay layer is located between the display screen and the light guide element;

[0026] The second phase delay layer is located on the light-emitting side of the light guide element;

[0027] A partially reflective and partially transmissive layer is located between the first phase retardation layer and the second phase retardation layer;

[0028] A reflective polarizer is located on the light-emitting side of the second phase retardation layer.

[0029] In some embodiments of the present invention, both the first phase delay layer and the second phase delay layer are quarter-wave plates.

[0030] In some embodiments of the present invention, the near-eye display device further includes: a lens group, the lens group including at least one lens;

[0031] The lens group is located on the light-emitting side of the light guide element, or the light guide element is located inside one of the lenses in the lens group, or the lens group includes multiple lenses and the light guide element is located between two adjacent lenses in the lens group.

[0032] In some embodiments of the present invention, the near-eye display device further includes an eye-tracking module and a control module, wherein the eye-tracking module and the light guide structure are respectively connected to the control module;

[0033] The eye-tracking module is used to collect the movement information of the human eye and send it to the control module. The control module is used to control the movement of the light guide structure according to the movement information of the human eye.

[0034] The beneficial effects of this invention are as follows:

[0035] The near-eye display device provided by the present invention includes: a display screen, the display screen including a central display area and multiple peripheral display areas; a light guide element located on the light-emitting side of the display screen; the light guide element includes a light guide element body and multiple light guide structures, the multiple light guide structures being located within the light guide element body, and the multiple light guide structures being arranged one-to-one with the multiple peripheral display areas; the light guide structures are used to guide the light emitted from the corresponding peripheral display areas to the light-emitting area of ​​the central display area for emission, so that the display images of the peripheral display areas can be superimposed on the area where the display images of the central display area are located, thereby increasing the number of display pixels in the light-emitting area of ​​the central display area and improving the resolution of the display image. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is one of the structural schematic diagrams of the near-eye display device provided in an embodiment of the present invention;

[0038] Figure 2 This is one of the structural schematic diagrams of the display screen provided in the embodiment of the present invention;

[0039] Figure 3 This is one of the structural schematic diagrams of the light guide element provided in the embodiments of the present invention;

[0040] Figure 4 This is a second schematic diagram of the structure of the display screen provided in an embodiment of the present invention;

[0041] Figure 5 This is a second schematic diagram of the structure of the light guide element provided in an embodiment of the present invention;

[0042] Figure 6 A parameter relationship diagram of the display screen and the light guide element provided in an embodiment of the present invention;

[0043] Figure 7 A second schematic diagram of the structure of a light guide element is provided for an embodiment of the present invention;

[0044] Figure 8 This is a schematic diagram of the structure of a diffraction grating provided in an embodiment of the present invention;

[0045] Figure 9 The third schematic diagram of the structure of the light guide element provided in this embodiment of the invention;

[0046] Figure 10 Fourth schematic diagram of the structure of the light guide element provided in the embodiments of the present invention;

[0047] Figure 11 This is a second schematic diagram of the near-eye display device provided in an embodiment of the present invention;

[0048] Figure 12 This is the third schematic diagram of the near-eye display device provided in the embodiments of the present invention;

[0049] Figure 13 Fourth schematic diagram of the near-eye display device provided in the embodiments of the present invention;

[0050] Figure 14 Fifth schematic diagram of the near-eye display device provided in the embodiments of the present invention;

[0051] Figure 15 This is the sixth schematic diagram of the near-eye display device provided in the embodiments of the present invention;

[0052] Figure 16 This is the seventh schematic diagram of the near-eye display device provided in the embodiments of the present invention;

[0053] Figure 17 This is the eighth schematic diagram of the near-eye display device provided in the embodiments of the present invention;

[0054] Figure 18 This is the ninth schematic diagram of the near-eye display device provided in the embodiment of the present invention;

[0055] Explanation of reference numerals in the attached figures:

[0056] Display screen 1, central display area 11, peripheral display area 12, other display areas 13, light guide element 2, light guide element body 21, light incident surface 211, light emitting surface 212, first side surface 213, second side surface 214, third side surface 215, fourth side surface 216, first axis S1, second axis S2, light guide structure 22, first polarization selection layer 221, second polarization selection layer 222, first linear polarizer 3, second linear polarizer 4, lens group 5, first phase retardation layer 6, second phase retardation layer 7, partially reflective and partially transmissive layer 8, reflective polarizer 9, infrared light-emitting device T, camera R. Detailed Implementation

[0057] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction in the present invention are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of the present invention. The accompanying drawings of the present invention are for illustrative purposes only and do not represent actual proportions.

[0058] Because the distribution of visual cells in the human eye is uneven, the human eye's ability to perceive images varies in different visual ranges. In particular, the distribution of visual cells is more dense in the visual range of less than 3° to 5°, and the human eye's ability to distinguish images is strongest in this range. As the visual range increases, the human eye's ability to distinguish images gradually decreases.

[0059] Near-eye display devices consist of a display screen and imaging optics. Light emitted from the display screen is imaged at a distance where the human eye can comfortably focus through the imaging optics. In related near-eye display devices, the resolution of the displayed image is consistent across all viewing angles. To match the image resolution to the human eye's resolving power within the central viewing angle, the overall resolution of the display screen needs to be increased. However, limitations in display screen manufacturing processes make this difficult to achieve, resulting in insufficient visual data perceptible to the human eye within the central viewing angle, leading to the screen-door effect and affecting visual quality.

[0060] In view of this, the present invention provides a near-eye display device that can improve the resolution of the central display area of ​​the near-eye display device, adapt to the human eye's resolution ability, and improve the viewing effect.

[0061] Figure 1 This is one of the structural schematic diagrams of the near-eye display device provided in an embodiment of the present invention.

[0062] like Figure 1As shown, the near-eye display device provided in this embodiment of the invention includes a display screen 1 and a light guide element 2, with the light guide element 2 located on the light-emitting side of the display screen 1. The display screen 1 includes a central display area 11 and multiple peripheral display areas 12. The light-emitting area of ​​the central display area 11 corresponds to the central viewing angle of the human eye. The light guide element 2 includes a light guide element body 21 and multiple light guide structures 22. The multiple light guide structures 22 are located within the light guide element body 21, and each of the multiple light guide structures 22 corresponds to one of the multiple peripheral display areas 12. The light guide structures 22 can be used to guide the light emitted from the corresponding peripheral display area 12 to the light-emitting area of ​​the central display area 11 for emission. This allows the images displayed in the multiple peripheral display areas 12 to be superimposed on the image displayed in the central display area 11, increasing the number of pixels displayed in the light-emitting area of ​​the central display area 11. This increases the number of pixels observable by the human eye within the central viewing angle, matching the display resolution of the near-eye display device with the resolving power of the human eye, which helps eliminate the screen-door effect and improves the viewing experience.

[0063] Specifically, the light guide element body 21 includes a light-incident surface 211 and a light-exit surface 212 that are parallel to each other. The light guide structure 22 includes a first polarization selection layer 221 and a second polarization selection layer 222. Both the first polarization selection layer 221 and the second polarization selection layer 222 are used to reflect light in a first polarization state and transmit light in a second polarization state. The polarization directions of the light in the first polarization state and the light in the second polarization state are orthogonal. For example, the light in the first polarization state is P-light and the light in the second polarization state is S-light.

[0064] Reference Figure 1 A first linear polarizer 3 can be provided on the light-emitting side of the peripheral display area 12 of the display screen 1. The first linear polarizer 3 is used to transmit light in a first polarization state. A second linear polarizer 4 can be provided on the light-emitting side of the central display area 11 of the display screen 1. The second linear polarizer 4 is used to transmit light in a second polarization state, so that the light emitted from the peripheral display area 12 can be reflected by the first polarization selection layer 221 and the second polarization selection layer 222, and the light emitted from the central display area 11 can be transmitted by the second polarization selection layer 222, thus avoiding light loss.

[0065] like Figure 1The light propagation path in the near-eye display device shown is as follows: Light B1, in a second polarization state, emitted from the central display area 11 of the display screen 1, enters through the light-incident surface 211 of the light guide element body 21, is transmitted through the light guide element body 21 or the second polarization selection layer 222, and exits through the light-exit surface 212 of the light guide element 2. Light B2, in a first polarization state, emitted from the peripheral display area 12 of the display screen 1, enters through the light-incident surface 211 into the interior of the light guide element body 21, is reflected by the first polarization selection layer 221, undergoes multiple total internal reflections between the light-incident surface 211 and the light-exit surface 212 of the light guide element body 21, and then enters through the second polarization selection layer 222, where it is reflected again to the light-exit surface 212 of the light guide element body 21 before exiting. Light B3 emitted from other display areas 13 of the display screen 1 is directly transmitted through the light guide element 2.

[0066] In this embodiment of the invention, by adjusting the structure and setting angle of the first polarization selection layer 221 and the second selection layer, the light-emitting area of ​​the light B2 reflected by the light guide structure 22 can be made consistent with the light-emitting area of ​​the light B1 transmitted by the light guide element body 21 or the second polarization selection layer 222. This achieves the superposition of the display image of the peripheral display area 12 and the display image of the central display area 11, increases the number of pixels displayed within the central viewing angle, and improves the display effect.

[0067] In this embodiment of the invention, to avoid disrupting the integrity of the image in other display areas 13 of the display screen 1, the peripheral display area 12 can be located near the side of the display screen 1. Correspondingly, the light guide element body 21 includes multiple side surfaces, which are connected to the light-incident surface 211 and the light-emitting surface 212. The first polarization selection layer 221 in each light guide structure 22 is correspondingly located near one side surface of the light guide element body 21. The orthographic projection of the first polarization selection layer 221 on the display screen 1 falls into the corresponding peripheral display area 12, so that the light emitted from the peripheral display area 12 is incident on the corresponding first polarization selection layer 221.

[0068] Figure 2 This is one of the structural schematic diagrams of the display screen provided in the embodiment of the present invention; Figure 3 This is one of the structural schematic diagrams of the light guide element provided in the embodiments of the present invention.

[0069] like Figure 2 As shown, the peripheral display areas 12 of the display screen 1 can be located at the four corners of the display screen 1, and the image formed by stitching together the images displayed in the four peripheral display areas 12 is the same as the image displayed in the central display area 11. Correspondingly, as... Figure 3 As shown, there is an angle between adjacent side surfaces of the light guide element 2, and the first polarization selection layer 221 in each light guide structure 22 is located within an angle.

[0070] Figure 4 This is a second schematic diagram of the structure of the display screen provided in an embodiment of the present invention; Figure 5 This is a second schematic diagram of the structure of the light guide element provided in an embodiment of the present invention.

[0071] like Figure 4 As shown, the peripheral display areas 12 of the display screen 1 can be located at the center of the four sides of the display screen 1, and the image formed by stitching together the images displayed in the four peripheral display areas 12 is the same as the image displayed in the central display area 11. Correspondingly, the multiple side surfaces of the light guide element 2 include a first side surface 213 and a second side surface 214 arranged opposite to each other, and a third side surface 215 and a fourth side surface 216 arranged opposite to each other. The first side surface 213 and the second side surface 214 are symmetrical about the first axis S1, and the third side surface 215 and the fourth side surface 216 are symmetrical about the second axis S2. The first polarization selection layer 221 corresponding to the first side surface 213 and the second side surface 214 is located on the second axis S2, and the first polarization selection layer 221 corresponding to the third side surface 215 and the fourth side surface 216 is located on the first axis S1.

[0072] Reference Figure 3 and Figure 5 In this embodiment of the invention, the second polarization selection layers 222 of the plurality of light guide structures 22 can be arranged adjacently, and the orthographic projection of each second polarization selection layer 222 on the display screen 1 falls into the central display area 11 so that the emitted light from the central display area 11 can pass through.

[0073] Understandable, Figures 2-5 The diagram illustrates two possible implementations of the arrangement of the peripheral display area 12 of the display screen 1 with the light guide structure 22. In specific implementations, the positions of the peripheral display area 12 and its corresponding light guide structure 22 can be designed according to requirements. By adjusting the structure and setting angle of the first polarization selection layer 221 and the second polarization selection layer 222, the superposition of the image in the peripheral display area 12 and the image in the central display area 11 can be achieved.

[0074] Figure 6 A parameter relationship diagram of the display screen and the light guide element provided for an embodiment of the present invention.

[0075] like Figure 6 As shown, the display screen 1 and the light guide element 2 satisfy the following relationship:

[0076]

[0077] L2 = L1 + L4 + L3 * simθ

[0078] Wherein, L1 represents the sum of the widths of the central display area 11 and other display areas 13 of the display screen 1, L2 represents the width of the light guide element 2, L3 represents the distance between the display screen 1 and the light guide element 2, L4 represents the width of the peripheral display area 12 of the display screen 1, θ represents half of the central viewing angle, n represents the refractive index of the light guide element body 21, and β represents the angle between the first polarization selection layer 221 and the light emitting surface 212 and the angle between the second polarization selection layer 222 and the light incident surface 211.

[0079] By designing the display screen 1 and the light guide element 2 using the above parameter relationships, each pixel of the image in the peripheral display area 12 can fill the gap between the pixels of the image in the central display area 11. The images in the peripheral display area 12 and the central display area 11 are complementary and superimposed, thereby increasing the number of pixels that can be seen from the central viewing angle, improving the resolution of the central viewing angle of the near-eye display device, and improving the display effect.

[0080] In this embodiment of the invention, the first polarization selection layer 221 and the second polarization selection layer 222 may employ, but are not limited to, reflective polarizers and diffraction gratings. (Refer to...) Figure 1 and Figure 6 The first polarization selection layer 221 and the second polarization selection layer 222 can both be reflective polarizers, and the first polarization selection layer 221 and the second polarization selection layer 222 can be arranged in parallel, and their design parameters satisfy the above relationship.

[0081] Figure 7 The second schematic diagram of the structure of the light guide element provided in the embodiment of the present invention.

[0082] like Figure 7 As shown, both the first polarization selection layer 221 and the second polarization selection layer 222 can be diffraction gratings. The materials used for the diffraction gratings can include highly reflective metals such as aluminum. The metal is uniformly deposited on a glass plate or other transparent flat or curved surface, and then patterned to create metal wire grids distributed at certain intervals, with a spacing and depth of tens to hundreds of nanometers. For example, see reference... Figure 8 , Figure 8 This is a schematic diagram of the structure of a diffraction grating provided in an embodiment of the present invention. Figure 8 (a) and (b) in the figure represent two possible shapes and arrangements of the metal wire grid.

[0083] Two beams of light incident on the grating are reflected in the metal wire grid and diffracted and superimposed. When the spacing and depth of the metal wire grid are adjusted, the direction of the reflected light of a specific wavelength can be adjusted. Thus, the light emitted from the peripheral display area 12 of the display screen 1 can be transmitted to the light-emitting area of ​​the central display area 11 and emitted, realizing the complementary superposition of the image of the peripheral display area 12 and the image of the central display area 11, and improving the display resolution of the central viewing angle.

[0084] Figure 9 The third schematic diagram of the structure of the light guide element provided in this embodiment of the invention; Figure 10 The fourth schematic diagram of the structure of the light guide element provided in the embodiment of the present invention.

[0085] like Figure 9 As shown, the first polarization selection layer 221 can be a diffraction grating, and the second polarization selection layer 222 can be a reflective polarizer, or, as... Figure 10 As shown, the first polarization selection layer 221 can be a reflective polarizer, and the second polarization selection layer 222 can be a diffraction grating. By adapting the angle and structure of the reflective polarizer and the structure of the diffraction grating, complementary superposition of the image in the peripheral display area 12 and the image in the central display area 11 can also be achieved.

[0086] Reference Figure 1 The near-eye display device provided in this embodiment of the invention further includes a lens group 5, which can be disposed on the light-emitting side of the light guide element 2. The lens group 5 includes at least one lens, which is used to image the incident light so that the image is focused comfortably by the human eye, and can also correct aberrations and improve image quality. The surface parameters and arrangement of each lens in the lens group 5 can be designed according to specific needs, and this embodiment of the invention does not limit them.

[0087] Figure 11 This is a second schematic diagram of the near-eye display device provided in an embodiment of the present invention; Figure 12 This is the third schematic diagram of the near-eye display device provided in the embodiments of the present invention; Figure 13 The fourth schematic diagram of the near-eye display device provided in the embodiment of the present invention.

[0088] In this embodiment of the invention, the positions of the lens group 5 and the light guide element 2 can be set according to requirements, for example, such as Figure 11 As shown, the light guide element 2 can be located inside one of the lenses in the lens group 5. The lens and the light guide element 2 can be integrally formed or spliced ​​together. Or, as... Figure 12 As shown, lens group 5 can be located between display screen 1 and light guide element 2. Alternatively, as... Figure 13 As shown, the lens group 5 includes multiple lenses, and the light guide element 2 is located between two adjacent lenses in the lens group 5.

[0089] Figure 14 The fifth schematic diagram of the near-eye display device provided in the embodiment of the present invention.

[0090] like Figure 14As shown, the near-eye display device may further include an eye-tracking module and a control module, with the eye-tracking module and the light guide structure 22 respectively connected to the control module. The eye-tracking module may include an infrared light-emitting device T and a camera R. Infrared light emitted from the infrared light-emitting device T illuminates the human eye and is reflected by the pupil and iris to the camera R. The camera R receives the reflected light to collect the movement information of the human eye and sends it to the control module. The control module may include devices for processing the human eye movement information, such as a central processing unit (CPU), and devices for controlling the movement of the light guide structure 22, such as a micro-motor. The control module can calculate the human eye movement information and control the movement of the light guide structure 22 based on this information, so that the light emitted from the peripheral display area 12 of the display screen 1 is superimposed on the central viewing angle after passing through the light guide structure 22, thereby improving the resolution of the image viewed by the human eye.

[0091] For example, the first polarization selection layer 221 and the second polarization selection layer 222 in the light guide structure 22 can be connected to a micro motor respectively and rotated under the control of the micro motor. A certain gap is designed between the light guide structure 22 and the light guide element body 21. Alternatively, the light guide element body 21 can be a liquid lens so that the light guide structure 22 can move therein.

[0092] Figure 15 This is the sixth schematic diagram of the near-eye display device provided in the embodiment of the present invention.

[0093] like Figure 15 As shown, the near-eye display device may further include: a first phase retardation layer 6, a second phase retardation layer 7, a partially reflective and partially transmissive layer 8, and a reflective polarizer 9. The first phase retardation layer 6 is located between the display screen 1 and the light guide element 2, and the second phase retardation layer 7 is located on the light-emitting side of the light guide element 2. For example, both the first phase retardation layer 6 and the second phase retardation layer 7 can be quarter-wave plates. The partially reflective and partially transmissive layer 8 is located between the first phase retardation layer 6 and the second phase retardation layer 7. The reflective polarizer 9 is located on the light-emitting side of the second phase retardation layer 7 and is used to reflect light of a first polarization state and transmit light of a second polarization state. In this case, a first linear polarizer 3 is provided on the light-emitting side of the peripheral display area 12 of the display screen 1, which is used to transmit light of the first polarization state. A second linear polarizer 4 is provided on the light-emitting side of the central display area 11 and other display areas 13 of the display screen 1, which is used to transmit light of the second polarization state.

[0094] like Figure 15The light propagation path in the near-eye display device shown is as follows: The light B1 emitted from the central display area 11 of the display screen 1 is converted into circularly polarized light through the first phase delay layer 6, and then transmitted through the light guide element body 21 or the second polarization selection layer 222 to exit the light guide element 2. It then enters the partially reflective and partially transmissive layer 8. The transmitted light is then entered through the lens group 5 and converted into light with the first polarization state through the second phase delay layer 7. It is then reflected by the reflective polarizer 9 and converted into circularly polarized light again through the second phase delay layer 7. The circularly polarized light enters through the lens group 5 and enters the partially reflective and partially transmissive layer 8. The light reflected by the partially reflective and partially transmissive layer 8 is converted into light with the second polarization state again through the lens group 5 and the second phase delay layer 7. Finally, it is transmitted through the reflective polarizer 9 and emitted towards the human eye.

[0095] The light B2 emitted from the peripheral display area 12 of the display screen 1 in the first polarization state is guided by the light guide element 2 to the partially reflective and partially transmissive layer 8. The light transmitted by the partially reflective and partially transmissive layer 8 is incident on the second phase delay layer 7 through the lens group 5. It is transmitted by the second phase delay layer 7 and the reflective polarizer 9 and emitted towards the human eye. Its light emission area is consistent with the light emission area emitted from the central display area 11.

[0096] The propagation process of the second polarized light B3 emitted from other display areas 13 of display screen 1 is the same as that of the light emitted from the central display area 11.

[0097] Figure 16 This is the seventh schematic diagram of the near-eye display device provided in the embodiments of the present invention; Figure 17 This is the eighth schematic diagram of the near-eye display device provided in the embodiments of the present invention; Figure 18 This is the ninth schematic diagram of the near-eye display device provided in an embodiment of the present invention.

[0098] In this embodiment of the invention, the relative positions of the light guide element 2, the partially reflective and partially transmissive layer 8, and the lens group 5 between the first phase delay layer 6 and the second phase delay layer 7 can be set as needed. For example, Figure 15 As shown, in the direction from the first phase retardation layer 6 towards the second phase retardation layer 7, a light guide element 2, a partially reflective and partially transmissive layer 8, and a lens group 5 are sequentially arranged. Alternatively, as... Figure 16 As shown, in the direction from the first phase retardation layer 6 towards the second phase retardation layer 7, a partially reflective and partially transmissive layer 8, a light guide element 2, and a lens group 5 are sequentially arranged. Alternatively, as... Figure 17 As shown, in a direction gradually moving from the first phase retardation layer 6 towards the second phase retardation layer 7, a partially reflective and partially transmissive layer 8 and a lens group 5 are sequentially arranged, with the light guide element 2 located inside one of the lenses in the lens group 5. Alternatively, as... Figure 18As shown, in the direction from the first phase delay layer 6 to the second phase delay layer 7, a partially reflective and partially transmissive layer 8 and a lens group 5 are arranged in sequence, and the light guide element 2 is located between two adjacent lenses in the lens group 5.

[0099] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0100] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A near-eye display device, characterized in that, include: The display screen includes a central display area and multiple peripheral display areas; A light guide element is located on the light-emitting side of the display screen; The light guide element includes a light guide element body and multiple light guide structures. The multiple light guide structures are located within the light guide element body, and each of the multiple light guide structures is arranged in a one-to-one correspondence with a multiple peripheral display area. The light guide structure is used to guide the light emitted from the corresponding peripheral display area to the light emission area of ​​the central display area for emission. The main body of the light guide element includes a light-incident surface and a light-outceasing surface that are parallel to each other; The light guide structure includes a first polarization selection layer and a second polarization selection layer. Both the first polarization selection layer and the second polarization selection layer are used to reflect light in a first polarization state and transmit light in a second polarization state. The polarization directions of the light in the first polarization state and the light in the second polarization state are orthogonal. The light guide structure is configured to allow light emitted from the peripheral display area to be incident on the first polarization selection layer and reflected, undergoing multiple total internal reflections between the light incident surface and the light emitting surface and then incident on the second polarization selection layer, and then reflected out of the light guide element body by the second polarization selection layer. The second polarization selection layers of the multiple light guide structures are arranged adjacent to each other, and the orthographic projection of each second polarization selection layer on the display screen falls into the central display area; Multiple first linear polarizers are located between the display screen and the light guide element; The plurality of first linear polarizers are configured one-to-one with the plurality of peripheral display areas, and the first linear polarizers are used to transmit light in the first polarization state.

2. The near-eye display device as described in claim 1, characterized in that, The light guide element body includes multiple side surfaces, which are used to connect the light incident surface and the light emitting surface; The first polarization selection layer in each of the light guide structures is disposed near one of the side surfaces of the light guide element body, and the orthographic projection of the first polarization selection layer on the display screen falls into the corresponding peripheral display area.

3. The near-eye display device as described in claim 2, characterized in that, There is an angle between adjacent side surfaces, and the first polarization selection layer in each light guide structure is located within one of the angles.

4. The near-eye display device as described in claim 2, characterized in that, The plurality of side surfaces include a first side surface and a second side surface disposed opposite to each other, and a third side surface and a fourth side surface disposed opposite to each other; the first side surface and the second side surface are symmetrical about a first axis, and the third side surface and the fourth side surface are symmetrical about a second axis; The first polarization selection layer corresponding to the first side surface and the second side surface is located on the second axis, and the first polarization selection layer corresponding to the third side surface and the fourth side surface is located on the first axis.

5. The near-eye display device as described in claim 1, characterized in that, Both the first polarization selection layer and the second polarization selection layer include reflective polarizers.

6. The near-eye display device as claimed in claim 1, characterized in that, The first polarization selection layer includes a diffraction grating, and the second polarization selection layer includes a reflective polarizer; Alternatively, the first polarization selection layer may include a reflective polarizer, and the second polarization selection layer may include a diffraction grating.

7. The near-eye display device as claimed in claim 1, characterized in that, Both the first polarization selection layer and the second polarization selection layer include diffraction gratings.

8. The near-eye display device as claimed in claim 1, characterized in that, Also includes: A second linear polarizer is located between the display screen and the light guide element, and the direction of the transmission axis of the second linear polarizer is perpendicular to the direction of the transmission axis of the first linear polarizer. The second linear polarizer is disposed at least corresponding to the central display area, and the second linear polarizer is used to transmit light in the second polarization state.

9. The near-eye display device as described in claim 8, characterized in that, Also includes: A first phase delay layer is located between the display screen and the light guide element; The second phase delay layer is located on the light-emitting side of the light guide element; A partially reflective and partially transmissive layer is located between the first phase retardation layer and the second phase retardation layer; A reflective polarizer is located on the light-emitting side of the second phase retardation layer.

10. The near-eye display device as claimed in claim 9, characterized in that, Both the first phase delay layer and the second phase delay layer use quarter-wave plates.

11. The near-eye display device according to any one of claims 1 to 10, characterized in that, Also includes: A lens group, the lens group comprising at least one lens; The lens group is located on the light-emitting side of the light guide element, or the light guide element is located inside one of the lenses in the lens group, or the lens group includes multiple lenses and the light guide element is located between two adjacent lenses in the lens group.

12. The near-eye display device according to any one of claims 1 to 8, characterized in that, Also includes: An eye-tracking module and a control module are provided, wherein the eye-tracking module and the light guide structure are respectively connected to the control module; The eye-tracking module is used to collect human eye movement information and send it to the control module. The control module is used to control the movement of the light guide structure according to the human eye movement information.

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