Near-eye display device
By employing a multi-display and imaging lens group design in VR devices, and utilizing optical path design and image stitching, the problem of single-screen resolution limitations has been solved, achieving higher image resolution and field of view while reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2021-11-23
- Publication Date
- 2026-05-19
AI Technical Summary
In existing VR devices, since each eye can only correspond to one screen, the display resolution seen by the human eye depends on the resolution of that single screen. When the screen resolution is low, the screen-door effect occurs. Improving the screen resolution is limited by manufacturing technology and cost, making it difficult to significantly increase it.
The design employs multiple displays and imaging lens groups, including a first display, a second display, and a third display. The lens design utilizes freeform surfaces. Through optical path design and image stitching, the resolution requirements of each display are reduced, and higher image resolution is achieved by utilizing the overlapping areas of the images.
By combining multiple displays and lenses, the resolution requirements for each display are reduced, resulting in lower costs, while achieving higher image resolution and a wider field of view, and reducing the occurrence of the screen-door effect.
Smart Images
Figure CN116547584B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of display technology, and more particularly to a near-eye display device. Background Technology
[0002] In recent years, with the continuous development of Virtual Reality (VR) and Augmented Reality (AR) technologies, near-eye display products, initially used in the military field, have gradually been widely applied in civilian fields such as film, education, and healthcare. VR display devices have advantages such as immersion, interactivity, and imagination; AR display devices, by overlaying virtual scene images onto the real-world environment, can achieve a fusion of the real and virtual scenes, thereby enhancing users' cognitive abilities regarding the real world.
[0003] In current VR devices, because each eye can only correspond to one screen (or both eyes share the same screen), the display resolution that the human eye can see depends on the resolution of that individual screen. Therefore, when the screen resolution is low, there will be noticeable gaps between the pixels in the image seen by the human eye, a phenomenon known as the screen-door effect. Increasing screen resolution is an important way to solve the screen-door effect, but due to limitations in current screen manufacturing technology and costs, high-resolution screens have very high defect rates and are very expensive, making it difficult to significantly improve screen resolution. Summary of the Invention
[0004] This disclosure provides a near-eye display device, including:
[0005] Multiple displays for image display; the multiple displays include at least: a first display, a second display, and a third display; and
[0006] An imaging lens group is used to image the displayed image on the display screen; the imaging lens group includes at least: a first lens and a second lens;
[0007] Wherein, the first lens and the second lens are both located on the light-emitting side of the first display screen, and the second lens is located on the side of the first lens that is away from the first display screen; the second display screen and the third display screen are located on the side of the first lens that is away from the first display screen.
[0008] The first lens includes: a first surface facing the first display screen and a second surface facing away from the first display screen; the first surface is used to transmit the outgoing light from the first display screen; the second surface is used to transmit the outgoing light from the first display screen and reflect the outgoing light from the second display screen and the third display screen.
[0009] In some embodiments of this disclosure, the second display screen and the third display screen are symmetrically arranged about the first display screen.
[0010] In some embodiments of this disclosure, the second display screen and the third display screen are symmetrically arranged about the first display screen along the horizontal direction of the human eye's field of vision;
[0011] Alternatively, the second display screen and the third display screen may be symmetrically arranged about the first display screen along the vertical direction of the human eye's field of vision.
[0012] In some embodiments of this disclosure, the first display screen, the second display screen, and the third display screen are all identical in shape and size;
[0013] The first display screen, the second display screen, and the third display screen are all rectangular display screens with an aspect ratio of 3:1; the first display screen, the second display screen, and the third display screen are arranged sequentially along the width direction of the rectangular display screen.
[0014] In some embodiments of this disclosure, the image resolution of the first display screen is greater than that of the second display screen and the third display screen.
[0015] In some embodiments of this disclosure, the first display screen, the second display screen, and the third display screen are liquid crystal displays, organic light-emitting diode displays, or silicon-based displays.
[0016] In some embodiments of this disclosure, the second surface of the first lens includes: a first region located in the middle, a second region and a third region located on both sides of the first region, a fourth region located on the side of the second region facing away from the first region, and a fifth region located on the side of the third region facing away from the first region; the second display screen is disposed facing the second region and the fourth region, and the third display screen is disposed facing the third region and the fifth region;
[0017] The first area is used to transmit the light emitted from the first display screen; the second area is used to transmit the light emitted from the first display screen and reflect the light emitted from the second display screen; the fourth area is used to reflect the light emitted from the second display screen; the third area is used to transmit the light emitted from the first display screen and reflect the light emitted from the third display screen; and the fifth area is used to reflect the light emitted from the third display screen.
[0018] In some embodiments of this disclosure, the first display screen and the second display screen display the same content in the display area corresponding to the second zone; the first display screen and the third display screen display the same content in the display area corresponding to the third zone.
[0019] In some embodiments of this disclosure, the display brightness of the first display screen in the display areas corresponding to the second and third regions is greater than the display brightness in other areas.
[0020] The display brightness of the second display screen in the area corresponding to the second zone is greater than the display brightness of other areas.
[0021] The third display screen has a higher display brightness in the display area corresponding to the third zone than in other areas.
[0022] In some embodiments of this disclosure, the second region, the third region, the fourth region, and the fifth region are all partially reflective and partially transmissive regions;
[0023] The reflectivity of the fourth and fifth regions is greater than that of the second and third regions.
[0024] In some embodiments of this disclosure, the second and third regions are partially reflective and partially transmissive regions; the fourth and fifth regions are reflective regions.
[0025] In some embodiments of this disclosure, the surface shapes of both the first lens and the second lens are freeform surfaces.
[0026] In some embodiments of this disclosure, the first lens is axially symmetric about the horizontal direction of the human eye's field of vision at the optical axis position, and the first lens is axially symmetric about the vertical direction of the human eye's field of vision at the optical axis position.
[0027] In some embodiments of this disclosure, it further includes:
[0028] A first lens group is located between the first lens and the second lens; and / or
[0029] A second lens group is located between the first display screen and the first lens; and / or
[0030] A third lens group is located between the second display screen and the first lens; and / or
[0031] The fourth lens group is located between the third display screen and the first lens.
[0032] In some embodiments of this disclosure, the first lens group, the second lens group, the third lens group, and the fourth lens group each include at least one lens;
[0033] The lens is a spherical lens, an aspherical lens, a prism, or a freeform lens. Attached Figure Description
[0034] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments of this disclosure will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 This is one of the structural schematic diagrams of the near-eye display device provided in the embodiments of this disclosure;
[0036] Figure 2 This is a top view of the near-eye display device provided in an embodiment of the present disclosure;
[0037] Figure 3 This is a second schematic diagram of the structure of the near-eye display device provided in the embodiments of this disclosure;
[0038] Figure 4 This is a schematic diagram of the field of view of the near-eye display device provided in the embodiments of this disclosure;
[0039] Figure 5 A simulation diagram of a near-eye display device provided in an embodiment of this disclosure;
[0040] Figure 6 This is the third schematic diagram of the near-eye display device provided in the embodiments of this disclosure.
[0041] 1-Display screen, 2-Imaging lens group, 3-First lens group, 4-Second lens group, 5-Third lens group, 6-Fourth lens group, 11-First display screen, 12-Second display screen, 13-Third display screen, 21-First lens, 22-Second lens. Detailed Implementation
[0042] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, the disclosure 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 disclosure 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 as described in this disclosure are illustrative of the accompanying drawings, but changes may be made as needed, and all such changes are included within the scope of protection of this disclosure. The accompanying drawings of this disclosure are for illustrative purposes only and do not represent actual scale.
[0043] Near-eye display devices are display devices worn on the user's eyes, typically in the form of glasses or helmets. In recent years, with the continuous development of virtual reality (VR) and augmented reality (AR) technologies, near-eye display products have gradually expanded from their initial application in the military field to widespread use in civilian fields such as film, education, and healthcare.
[0044] AR (Augmented Reality) near-eye display technology overlays virtual images generated by a near-eye display device onto real-world images, allowing users to see the final augmented reality image on the screen. VR (Virtual Reality) near-eye display technology displays images for the left and right eyes on corresponding near-eye displays. After the left and right eyes acquire the different image information, the brain can synthesize stereoscopic vision.
[0045] VR display devices have advantages such as immersion, interactivity, and imagination; AR display devices can achieve the fusion of real and virtual scenes by overlaying virtual scene images onto real scenes, thereby enhancing users' cognitive ability about the real world.
[0046] In current VR devices, because each eye can only correspond to one screen (or both eyes share the same screen), the display resolution that the human eye can see depends on the resolution of that individual screen. Therefore, when the screen resolution is low, there will be noticeable gaps between the pixels in the image seen by the human eye, a phenomenon known as the screen-door effect. Increasing screen resolution is an important way to solve the screen-door effect, but due to limitations in current screen manufacturing technology and costs, high-resolution screens have very high defect rates and are very expensive, making it difficult to significantly improve screen resolution.
[0047] In view of this, embodiments of the present disclosure provide a near-eye display device. Figure 1 This is one of the structural schematic diagrams of a near-eye display device provided in an embodiment of this disclosure.
[0048] like Figure 1 As shown, the near-eye display device includes: a display screen 1 and an imaging lens group 2.
[0049] Display screen 1 is used for image display.
[0050] Display screen 1 serves as an image source for displaying images. The near-eye display device may include two sets of display screens 1, one for displaying the left-eye image and the other for displaying the right-eye image. Independent imaging systems are then used to image the images displayed on the two sets of display screens 1. When the human eye views the left and right eye images, a certain parallax is produced, creating a stereoscopic display effect.
[0051] In this embodiment of the disclosure, the display screen 1 can be one of a liquid crystal display screen, an organic light-emitting diode display screen, or a silicon-based display screen, and is not limited thereto.
[0052] A Liquid Crystal Display (LCD) primarily consists of a backlight module and a liquid crystal display panel. The LCD panel itself does not emit light; it relies on a backlight module to provide illumination. The display principle of an LCD involves placing liquid crystal between two conductive glass plates. The electric field between two electrodes causes the liquid crystal molecules to twist, controlling the transmission or blocking of the backlight, thus displaying the image. Adding a color filter allows for the display of color images. LCD technology is mature, and LCD displays offer relatively low cost and excellent performance.
[0053] Organic light-emitting diode (OLED) displays, also known as organic electroluminescent displays or organic light-emitting semiconductor displays, are current-driven organic light-emitting devices. They emit light through the injection and recombination of charge carriers, with the luminous intensity directly proportional to the injected current. Under the influence of an electric field, holes generated at the anode and electrons at the cathode move and are injected into the hole transport layer and electron transport layer, respectively, migrating to the light-emitting layer. When these two electrons meet in the light-emitting layer, they generate excitons, which excite the light-emitting molecules to produce visible light. OLED displays are self-emissive, therefore they do not require a backlight module. Their small overall thickness facilitates the miniaturization of near-eye displays and makes them easier to install.
[0054] Silicon-based displays fabricate the driving elements of the display on a silicon substrate. This process can improve the resolution of the display and enhance the display effect of near-eye display devices. Current silicon-based displays include silicon-based liquid crystal displays (LCDs) and silicon-based organic light-emitting diode (OLED) displays, which are not limited to these types.
[0055] Imaging lens group 2 is located on the light-emitting side of display screen 1 and is used to image the displayed image on display screen 1.
[0056] The display screen 1 in the near-eye display device is relatively small, and the displayed image cannot be directly viewed by the human eye. Therefore, an imaging lens group 2 needs to be set on the light-emitting side of the display screen 1 to magnify and image the displayed image before it is observed by the human eye.
[0057] Normally, the display screen 1 can be set within one focal length of the imaging lens group 2, so that the imaging lens group 2 can form a magnified and upright virtual image on the same side of the display screen 1 for human eyes to view.
[0058] In this embodiment of the disclosure, the display screen 1 includes at least a first display screen 11, a second display screen 12, and a third display screen 13. The imaging lens group 2 includes at least a first lens 21 and a second lens.
[0059] Among them, such as Figure 1 As shown, the first lens 21 and the second lens 22 are both located on the light-emitting side of the first display screen 11, and the second lens 22 is located on the side of the first lens 21 that is away from the first display screen 11; the second display screen 12 and the third display screen 13 are located on the side of the first lens 21 that is away from the first display screen 11.
[0060] The first lens 21 includes a first surface s1 facing the first display screen 11 and a second surface s2 facing away from the first display screen 11; the first surface s1 is used to transmit the outgoing light from the first display screen 11; the second surface s2 is used to transmit the outgoing light from the first display screen 11 and reflect the outgoing light from the second display screen 12 and the third display screen 13.
[0061] The imaging lens group 2 in this embodiment employs at least two lenses. Using only one lens as the imaging lens would increase the design complexity of the lens and result in a smaller field of view for the entire device. Therefore, the imaging lens group 2 in this embodiment employs at least two lenses.
[0062] The first display screen 11 is located on the side of the imaging lens group 2 away from the human eye and positioned directly in front of the human eye. The image displayed on the first display screen 11 can be imaged using the traditional transmission imaging principle. The second display screen 12 and the third display screen 13 are both located on the side of the first lens 21 away from the first display screen 11. The images displayed on the second display screen 12 and the third display screen 13 can first be incident on the first lens 21 for reflection and then enter the second lens 22 for imaging. Thus, images can be stitched together using at least three display screens, which can relatively reduce the resolution requirement of each display screen, reduce costs, and achieve higher image resolution display through image stitching.
[0063] Figure 2 This is a top view of the near-eye display device provided in an embodiment of the present disclosure.
[0064] like Figure 2 As shown, if we take Figure 1 The structure shown is called an optical system. In specific implementation, an optical system can be set up for each eye, where the left eye le corresponds to the left eye optical system L, and the right eye re corresponds to the right eye optical system R. The left eye optical system L and the right eye optical system R can be set symmetrically. When there is a certain parallax between the images displayed by the left eye and the images displayed by the right eye, they can be fused into a three-dimensional image in the brain.
[0065] In practical implementation, the second display screen 12 and the third display screen 13 can be arranged symmetrically with respect to the first display screen 11. This better conforms to the rules of human vision, with the first display screen displaying the image directly in front of the human eye, and the second and third display screens 12 and 13 displaying images of the edge areas within the human eye's field of vision. Symmetrical arrangement of the second and third display screens 12 and 13 simplifies the design of the imaging lens group.
[0066] In some embodiments, the second display screen 12 and the third display screen 13 can be symmetrically arranged about the first display screen 11 along the horizontal direction of the human eye's field of vision. For specific arrangements, please refer to [reference needed]. Figure 2 The schematic diagram of the top view of the near-eye display device shown illustrates that, for each eye, the first display screen 11 can be placed directly in front of the eye, and the second display screen 12 and the third display screen 13 can be placed on the left and right sides of the first display screen, thereby expanding the human eye's horizontal field of view.
[0067] In some embodiments, the second display screen 12 and the third display screen 13 can be symmetrically arranged about the first display screen 11 along the vertical direction of the human eye's field of vision. For each eye, the first display screen 11 can be placed directly in front of the eye, and the second display screen 12 and the third display screen 13 can be placed on the upper and lower sides of the first display screen, thereby expanding the human eye's image field of vision in the vertical direction.
[0068] When adopting such Figure 2 When the near-eye display device structure shown is designed for a single eye, a second display screen 12 and a third display screen 13 need to be set on the left and right sides of the first display screen 11. This results in a large horizontal expansion, while the space inside the eyes is relatively small. This may cause structural interference between the display screen on the right side of the left eye and the display screen on the left side of the right eye, thereby affecting the field of view and the interpupillary distance adjustment range.
[0069] To address the aforementioned issues, the embodiments of this disclosure, when designing the optical system of the near-eye display device, can appropriately reduce the inward field of view of both eyes, specifically by reducing the field of view to the right of the left eye and the left of the right eye, thereby allowing the two displays on the inner sides of both eyes to maintain a certain distance. Furthermore, during the optical system design, the placement angle of the second display screen 12 and the third display screen 13 can be adjusted to increase the angle between the second and third display screens relative to the horizontal direction of the human eye, thereby reducing the horizontal space they occupy.
[0070] In this embodiment, the first display screen 11, the second display screen 12, and the third display screen 13 have the same shape and size. For example, the first display screen, the second display screen, and the third display screen are all rectangular displays, and the aspect ratio of the rectangular displays is as close as possible to 3:1. In this way, after the first display screen 11, the second display screen 12, and the third display screen 13 are arranged sequentially along the width direction of the rectangular displays, the aspect ratio of the overall displayed image can be close to 1:1.
[0071] For example, if the first display screen 11, the second display screen 12, and the third display screen 13 all use a 24:9 aspect ratio, then the aspect ratio of the three displays after being spliced together is 24:27, which is close to a 1:1 aspect ratio and conforms to the range of human vision. If the display resolution of each display screen is 3240×1080, then the resolution that is visible to the eye after splicing is approximately 3240×3240.
[0072] The human eye generally sees objects directly in front of it more clearly than objects at the edge. In order to conform to the characteristics and rules of human vision, the embodiments of this disclosure can set the image resolution of the first display screen 11 located in front of the human eye to be greater than the image resolution of the second display screen 12 and the third display screen 13 located on both sides of the first display screen 11.
[0073] In some embodiments, the physical resolutions of the first display screen 11, the second display screen 12, and the third display screen 13 may be the same. However, the second display screen 12 and the third display screen 13 may be controlled to display only a portion of the pixels, thereby making the image resolution of the first display screen 11 higher than that of the second display screen 12 and the third display screen 13.
[0074] In some embodiments, the physical resolution of the first display screen 11 may be higher than that of the second display screen 12 and the third display screen 13. In this way, when the above three display screens are used for image display, the image resolution of the first display screen 11 can be higher than that of the second display screen 12 and the third display screen 13.
[0075] In addition, based on the rules of how the human eye perceives real objects, the resolution of the three displays can be controlled to be high, while the resolution of the edge images can be low, resulting in a smooth overall display effect. No limitations are imposed here.
[0076] Figure 3 This is a second schematic diagram of the near-eye display device provided in an embodiment of this disclosure.
[0077] like Figure 3As shown, the second surface s2 of the first lens includes: a first region z1 located in the middle, a second region z2 and a third region z3 located on both sides of the first region, a fourth region z4 located on the side of the second region z2 away from the first region z1, and a fifth region z5 located on the side of the third region z3 away from the first region z1.
[0078] The second display screen 12 is positioned facing the second zone z2 and the fourth zone z4, and the third display screen 13 is positioned facing the third zone z3 and the fifth zone z5. The first zone z1 is used to transmit the light emitted from the first display screen 11; the second zone z2 is used to transmit the light emitted from the first display screen 11 and reflect the light emitted from the second display screen 12; the fourth zone z4 is used to reflect the light emitted from the second display screen 12; the third zone z3 is used to transmit the light emitted from the first display screen 11 and reflect the light emitted from the third display screen 13; and the fifth zone z5 is used to reflect the light emitted from the third display screen 13.
[0079] The first surface s1 of the first lens 21 is a completely transparent surface, and the first region z1 of the second surface s2 of the first lens 21 is a completely transparent surface. The second region z1 to the fifth region z2 need to be set as partially reflective and partially transmissive surfaces according to the optical path. For the light emitted from the first display screen 11, it passes through the first surface s1, the second surface s2 of the first lens, and the two surfaces of the second lens in sequence to reach the human eye E. For the light emitted from the second display screen 12, it first enters the second surface s2 of the first lens, is reflected by the second surface, and then passes through the two surfaces of the second lens to reach the human eye E. For the light emitted from the third display screen 13, it first enters the second surface s2 of the first lens, is reflected by the second surface, and then passes through the two surfaces of the second lens to reach the human eye E.
[0080] The optical paths of the second display screen 12 and the third display screen 13 can be symmetrically arranged, so the surface shape of the first lens can also be set as a symmetrical structure.
[0081] In this embodiment, both surfaces of the first lens 21 and the second lens can be freeform surfaces. Furthermore, the surface of the first lens is axially symmetric about the horizontal direction of the human eye's field of vision at the optical axis position, and also axially symmetric about the vertical direction of the human eye's field of vision at the optical axis position. In actual manufacturing, to enable the two lenses to be integrally formed, both surfaces of the lens are perfectly machinable. Using freeform surfaces makes it easier to achieve relatively specific functions. Unlike traditional spherical, aspherical, and Fresnel lenses, which are rotationally symmetric about the optical axis center, the freeform surfaces used in the first and second lenses of this embodiment are axially symmetric about the horizontal and vertical directions, respectively. This simplifies lens design and facilitates manufacturing.
[0082] The freeform surface types of the first and second lenses can be selected from various forms such as xy polynomial, Zernike polynomial, and Q-type, depending on design and processing requirements, and are not limited here. Compared with grinding and machining processes, in order to achieve mass production, the first and second lenses in this embodiment can be processed using molds, which is more conducive to adjusting complex surface shapes during production and processing, making the injection molding process for processing freeform surface lenses within the design specifications more cost-effective.
[0083] In this embodiment, the second region z2 and the fourth region z4 in the second surface s2 of the first lens are partially reflective and partially transmissive regions, specifically, they can be configured as semi-transmissive and semi-reflective regions. These regions transmit the light emitted from the first display screen 11 while reflecting the light from the second display screen 12 and the third display screen 13. The third region z3 and the fifth region z5 reflect the light from the second display screen 12 and the third display screen 13. Therefore, the third region z3 and the fifth region z5 can be configured as partially reflective and partially transmissive regions, with a reflectivity greater than the transmissivity. In some embodiments, the third region z3 and the fifth region z5 can also be configured as completely reflective regions, thereby improving light efficiency.
[0084] Figure 3 Only a portion of the imaging optical paths of the first display screen 11 and the second display screen 12 are shown. The imaging optical path of the third display screen 13 is symmetrically arranged with the second display screen 12. This embodiment of the disclosure is specifically described using a portion of the imaging optical paths of the first display screen 11 and the second display screen 12.
[0085] Figure 4 This is a schematic diagram of the field of view of a near-eye display device provided in an embodiment of this disclosure.
[0086] like Figure 3 and Figure 4 As shown, in this embodiment of the present disclosure, a second region z2 and a third region z3 are provided in the second surface s2 of the first lens. This region can transmit the light emitted from the first display screen 11 and reflect the light emitted from the second display screen 12 and the third display screen 13. As a result, when the human eye views the image, a partial image overlap region A12 is generated between the display area A1 of the first display screen and the display area A2 of the second display screen, and a partial image overlap region A13 is generated between the display area A1 of the first display screen and the display area A3 of the third display screen.
[0087] The reason for setting the upper image overlap area is that the pupil of the human eye is a circular area of a certain size, rather than an ideal point. Therefore, according to the principle of reverse light path, the light rays from adjacent and relatively close fields of view originating from the pupil will have a certain overlap area when they reach the lens surface. When the light rays travel forward, they pass through the overlap area and are then split before reaching the two displays (such as the first display and the second display, or the first display and the third display), resulting in incomplete light and a decrease in brightness.
[0088] In addition, due to differences caused by various factors such as interpupillary distance, pupil size, and exit pupil distance, the pupil cannot always be in the position designed for near-eye display devices, which means there is an optimal viewing range (eyebox) problem. This causes the actual light to change from its original position in the propagation path. Therefore, it is necessary to specifically set the aforementioned overlapping area to cover this difference.
[0089] by Figure 3 For example, when the human eye E looks straight ahead, most of the light emitted by the image at the junction of the first display screen 11 and the second display screen 12 that the human eye sees comes from the first display screen 11, and a small portion of the light comes from the second display screen 12 (e.g., ...). Figure 3 As shown by the solid line in the image, this portion of the light from the first display screen 11 and the second display screen 12 enters the human eye after passing through the second region z2. However, when the human eye's gaze is turned to one side of the second display screen, most of the light in the image at the splicing position of the first display screen 11 and the second display screen 12 seen by the human eye comes from the second display screen 12, and a small portion of the light comes from the first display screen 11 (as shown by the solid line in the image). Figure 3 As shown by the dotted line in the diagram, the light from both the first display screen 11 and the second display screen 12 enters the human eye after passing through the second zone z2. By displaying the same content at the splicing position on the first display screen 11 and the second display screen 13, a continuous image can be viewed without seams as the human eye's gaze moves.
[0090] For the aforementioned image overlap area, the first display screen 11 and the second display screen 12 can be configured to display the same content in the display area corresponding to the second region z1, and the first display screen 11 and the third display screen 13 can display the same content in the display area corresponding to the third region z3. Even if the first display screen 11 and the second display screen 12, as well as the first display screen 11 and the third display screen 13, display the same content in a certain area at the splicing position, this part of the image is fused by the imaging lens group before entering the human eye.
[0091] Regarding the phenomenon of reduced brightness (vignetting) in the aforementioned image overlap areas (A12 and A13), this embodiment of the present disclosure can set the display brightness of the first display screen in the display area corresponding to the second and third regions (x1 represents the display area corresponding to the second region z2) to be greater than the display brightness of other regions; set the display brightness of the second display screen in the display area x2 corresponding to the second region to be greater than the display brightness of other regions; and set the display brightness of the third display screen in the display area corresponding to the third region (symmetrically set with respect to x2) to be greater than the display brightness of other regions.
[0092] It should be noted that when making differentiated adjustments to the brightness of the edge display areas (such as x1 and x2) of the display screen, it is necessary to increase the display brightness of different positions of the light vignetting according to a certain rule, based on the vignetting law, so that it is consistent with the brightness of other positions seen by the human eye.
[0093] like Figure 4 As shown, in practical applications, the lenses in the imaging lens group can be circular, elliptical, or cut into a near-circular or near-elliptical shape to avoid the nose, or teardrop shape, etc., without limitation.
[0094] Figure 5 A simulation diagram of a near-eye display device provided in an embodiment of this disclosure. Figure 5 As shown, based on the above design principles, the present invention utilizes software simulation to achieve the aforementioned display effect.
[0095] Figure 6 This is the third schematic diagram of the near-eye display device provided in the embodiments of this disclosure.
[0096] like Figure 6 As shown, in some embodiments, in order to better modulate the light and achieve a better display effect, a first lens group 3 can be provided between the first lens 21 and the second lens 22, a second lens group 4 can be provided between the first display screen 11 and the first lens 21, a third lens group 5 can be provided between the second display screen 12 and the first lens 21, and a fourth lens group 6 can be provided between the third display screen 13 and the first lens 21.
[0097] The first lens group 3, the second lens group 4, the third lens group 5, and the fourth lens group 6 mentioned above can be set simultaneously, or one or more of them can be set according to the imaging quality. The first lens group 3, the second lens group 4, the third lens group 5, and the fourth lens group 6 each include at least one lens, and the lens can be a spherical lens, an aspherical lens, a prism, or a freeform surface lens, which is not limited here.
[0098] It should be noted that the above-mentioned additional lenses (groups) must be added under the condition that the lens matching structure allows, and the settings should be based on meeting the overall structure, assembly, and debugging of the optomechanical system.
[0099] Although preferred embodiments of this disclosure 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 the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.
[0100] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of the embodiments of this disclosure. Therefore, if these modifications and variations to the embodiments of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.
Claims
1. A near-eye display device, comprising: Multiple displays for image display; The plurality of displays includes at least: a first display, a second display, and a third display; and An imaging lens group is used to image the displayed image on the display screen; the imaging lens group includes at least: a first lens and a second lens; Wherein, the first lens and the second lens are both located on the light-emitting side of the first display screen, and the second lens is located on the side of the first lens that is away from the first display screen; the second display screen and the third display screen are located on the side of the first lens that is away from the first display screen. The first lens includes: a first surface facing the first display screen and a second surface facing away from the first display screen; the second surface includes: a first region located in the middle, and a second region and a third region located on both sides of the first region; the first surface is used to transmit the emitted light from the first display screen; the second surface is used to transmit the emitted light from the first display screen and reflect the emitted light from the second display screen and the third display screen. The first display screen and the second display screen display the same content in the display area corresponding to the second zone; the first display screen and the third display screen display the same content in the display area corresponding to the third zone.
2. The near-eye display device as claimed in claim 1, wherein, The second display screen and the third display screen are arranged symmetrically about the first display screen.
3. The near-eye display device as described in claim 2, wherein, The second and third displays are symmetrically arranged about the first display along the horizontal direction of the human eye's field of vision; Alternatively, the second display screen and the third display screen may be symmetrically arranged about the first display screen along the vertical direction of the human eye's field of vision.
4. The near-eye display device as described in claim 3, wherein, The first display screen, the second display screen, and the third display screen are all identical in shape and size; The first display screen, the second display screen, and the third display screen are all rectangular display screens with an aspect ratio of 3:1; the first display screen, the second display screen, and the third display screen are arranged sequentially along the width direction of the rectangular display screen.
5. The near-eye display device according to any one of claims 2-4, wherein, The image resolution of the first display screen is greater than that of the second display screen and the third display screen.
6. The near-eye display device according to any one of claims 1-4, wherein, The first display screen, the second display screen, and the third display screen are liquid crystal displays, organic light-emitting diode displays, or silicon-based displays.
7. The near-eye display device according to any one of claims 2-4, wherein, The second surface of the first lens further includes: a fourth region located on the side of the second region opposite to the first region, and a fifth region located on the side of the third region opposite to the first region; the second display screen is disposed facing the second region and the fourth region, and the third display screen is disposed facing the third region and the fifth region; The first area is used to transmit the light emitted from the first display screen; the second area is used to transmit the light emitted from the first display screen and reflect the light emitted from the second display screen; the fourth area is used to reflect the light emitted from the second display screen; the third area is used to transmit the light emitted from the first display screen and reflect the light emitted from the third display screen; and the fifth area is used to reflect the light emitted from the third display screen.
8. The near-eye display device as claimed in claim 1, wherein, The display brightness of the first display screen is greater in the display areas corresponding to the second and third zones than in other areas. The display brightness of the second display screen in the area corresponding to the second zone is greater than the display brightness of other areas. The third display screen has a higher display brightness in the display area corresponding to the third zone than in other areas.
9. The near-eye display device as claimed in claim 7, wherein, The second region, the third region, the fourth region, and the fifth region are all partially reflective and partially transmissive regions; The reflectivity of the fourth and fifth regions is greater than that of the second and third regions.
10. The near-eye display device as claimed in claim 7, wherein, The second and third regions are partially reflective and partially transmissive regions; the fourth and fifth regions are reflective regions.
11. The near-eye display device according to any one of claims 8-10, wherein, Both the first and second lenses have freeform surfaces.
12. The near-eye display device as claimed in claim 11, wherein, The first lens has an axisymmetric structure about the horizontal direction of the human eye's field of vision at the optical axis position, and the first lens has an axisymmetric structure about the vertical direction of the human eye's field of vision at the optical axis position.
13. The near-eye display device according to any one of claims 1-4, 8-10, and 12, further comprising: The first lens group is located between the first lens and the second lens; and / or The second lens group is located between the first display screen and the first lens; and / or The third lens group is located between the second display screen and the first lens; and / or The fourth lens group is located between the third display screen and the first lens.
14. The near-eye display device as claimed in claim 13, wherein, The first lens group, the second lens group, the third lens group, and the fourth lens group each include at least one lens; The lens is a spherical lens, an aspherical lens, a prism, or a freeform lens.