Optical waveguide display device

Abstract

The utility model relates to the technical field of display equipment, and particularly discloses an optical waveguide display device which comprises a protective shell, an optical machine and an optical waveguide, the optical machine and the optical waveguide are arranged in the protective shell, and an image light beam output by the optical machine is coupled into the optical waveguide through a coupling-in area of the optical waveguide and is emitted out through a coupling-out area. A display window is arranged at the position, corresponding to the coupling-out area of the optical waveguide, of the protective shell, and an image light beam emitted by the coupling-out area is projected to the outside of the protective shell through the display window at a preset field angle. The virtual image with a larger field angle can be projected outwards through the two-dimensional pupil expansion technology, a larger image area is generated, eye fatigue is effectively relieved, and good immersive experience can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to an optical waveguide display device. Background Art

[0002] Currently, most tablet computers use traditional display screens. Traditional tablet computer displays not only display small images, but also easily cause eye fatigue. Traditional display devices also have poor privacy when in use, and people around can also see the displayed images. In addition, with the advancement of imaging technology, people's demand for immersive experience is getting higher and higher, and existing tablet computers cannot meet the function of augmented reality. Utility Model Content

[0003] The purpose of the present application is to provide an optical waveguide display device, which can project a virtual image with a larger field of view angle outward through two-dimensional pupil expansion technology, produce a larger image area, which not only effectively relieves eye fatigue, but also can obtain a better immersive experience.

[0004] The embodiment of the present application is implemented as follows:

[0005] An embodiment of the present application provides an optical waveguide display device, comprising a protective shell, and an optical machine and an optical waveguide arranged in the protective shell, wherein an image light beam output by the optical machine is coupled into the optical waveguide through a coupling-in region of the optical waveguide and emitted from a coupling-out region, a display window is arranged at a position of the protective shell corresponding to the coupling-out region of the optical waveguide, and the image light beam emitted from the coupling-out region is projected through the display window to the outside of the protective shell at a preset field of view angle.

[0006] As an optional implementation, the coupling-in region is arranged on a side of the optical waveguide away from the display window; the optical waveguide display device also includes a reflector, and the image light beam emitted by the optical machine is reflected by the reflector and then enters the optical waveguide from the coupling-in region.

[0007] As an optional implementation, a driving motor is disposed in the protective shell, and a driving end of the driving motor is connected to the reflector for driving the reflector to rotate, and a rotation axis of the reflector is perpendicular to a main optical axis of the image light beam.

[0008] As an optional implementation, an operating component electrically connected to the optomechanical device is disposed in the protective shell, and an operating window is also provided on the protective shell, through which the operating component is exposed.

[0009] As an optional implementation, the operating component is a touch panel embedded in the operating window.

[0010] As an optional implementation, the protective shell includes a lower shell and an upper cover plate which are interlocked to form a accommodating chamber; the operation window and the display window are opened on the upper cover plate.

[0011] As an optional implementation, a middle mounting plate is sandwiched between the lower shell and the upper cover plate, a concave platform is provided on a side of the middle mounting plate close to the upper cover plate, the concave platform faces the upper cover plate, and the optical waveguide is embedded in the concave platform.

[0012] As an optional implementation, the middle mounting plate has a channel corresponding to the coupling-in area, and the image light beam can pass through the channel to enter the coupling-in area.

[0013] As an optional implementation, a heat sink is provided between the optical engine and the protective shell, and one side of the heat sink is in contact with the surface of the optical engine, and the other side of the heat sink is in contact with the inner wall of the protective shell.

[0014] As an optional implementation, a control mainboard and a wiring harness connecting the control mainboard and the optical engine are arranged in the protective shell; the control mainboard is arranged in a plane parallel to the plane where the optical waveguide is located.

[0015] In a preferred embodiment of the present application, the above-mentioned optical waveguide display device includes a protective shell and an optical machine and an optical waveguide arranged in the protective shell, the image light beam output by the optical machine is coupled into the optical waveguide from the coupling-in region of the optical waveguide and emitted from the coupling-out region, a display window is arranged at a position of the protective shell corresponding to the coupling-out region of the optical waveguide, and the image light beam emitted from the coupling-out region is projected to the outside of the protective shell through the display window at a preset field of view angle. The coupling-in region is arranged on the side of the optical waveguide away from the display window; the optical waveguide display device also includes a reflector, and the image light beam emitted by the optical machine is reflected by the reflector and enters the optical waveguide from the coupling-in region. A driving motor is arranged in the protective shell, and the driving end of the driving motor is connected to the reflector for driving the reflector to rotate, and the rotation axis of the reflector is perpendicular to the main optical axis of the image light beam.

[0016] The beneficial effects of the embodiments of the present application include:

[0017] An optical waveguide display device provided in an embodiment of the present application includes a protective shell, an optical machine and an optical waveguide disposed in the protective shell. The image light beam output by the optical machine in the embodiment of the present application is coupled into the optical waveguide from the coupling-in region of the optical waveguide and emitted from the coupling-out region. The optical waveguide has an expansion region, so that the image light beam has a larger field of view when emitted from the coupling-out region, thereby being able to project a larger image. In the embodiment of the present application, a display window is disposed at a position of the protective shell corresponding to the coupling-out region of the optical waveguide, and the image light beam emitted from the coupling-out region is projected to the outside of the protective shell through the display window at a preset field of view.

[0018] Compared with the prior art, the embodiment of the present application increases the pupil distance through the setting of the optical waveguide, which helps to reduce the image defocus caused by the normal movement of the eyeball, improves the viewing continuity and depth perception, thereby improving the comfort and naturalness of the user's viewing of the image, and is conducive to relieving eye fatigue. On the one hand, the embodiment of the present application can project a larger screen, which can effectively enhance the visual impact compared to the small screen of the prior art. On the other hand, the embodiment of the present application can provide a higher image resolution and fineness through a longer projection distance, so that the user can feel richer details and fuller colors. Therefore, the present application can bring a more realistic visual experience to the user and achieve a better immersive experience. In addition, compared with traditional display screens, the display device provided by the embodiment of the present application has a strong privacy. Due to the strong directionality of the image light, the human eye cannot see the screen image outside the light cone area projected by the display window, that is to say, the image cannot be seen around the optical waveguide display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is one of the structural schematic diagrams of the optical waveguide display device according to an embodiment of the present application;

[0021] Figure 2 This is the second structural schematic diagram of the optical waveguide display device according to the embodiment of the present application;

[0022] Figure 3 This is the third structural schematic diagram of the optical waveguide display device according to the embodiment of the present application.

[0023] icon:

[0024] 100-optical waveguide display device; 101-protective shell; 102-optical machine; 103-optical waveguide; 104-coupling area; 105-coupling area; 106-display window; 107-reflector; 108-drive motor; 109-drive end; 110-operation window; 111-touch pad; 112-lower shell; 113-upper cover; 114-middle mounting plate; 115-recess; 116-heat sink; 117-control main board. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Currently, most tablet computers use traditional display screens. Traditional tablet computer displays not only display small images, but also easily cause eye fatigue. Traditional display devices also have poor privacy when in use, and people around can also see the displayed images. In addition, with the advancement of imaging technology, people's demand for immersive experience is getting higher and higher, and existing tablet computers cannot meet the function of augmented reality.

[0030] In order to solve the above technical problems, an embodiment of the present application provides a light waveguide display device 100 .

[0031] An embodiment of the present application provides an optical waveguide display device 100, including a protective shell 101, and an optical engine 102 and an optical waveguide 103 arranged in the protective shell 101. The image light beam output by the optical engine 102 is coupled into the optical waveguide 103 by a coupling-in region 104 of the optical waveguide 103 and emitted by an outcoupling region 105. A display window 106 is arranged at a position of the protective shell 101 corresponding to the outcoupling region 105 of the optical waveguide 103. The image light beam emitted by the outcoupling region 105 is projected outside the protective shell 101 through the display window 106 at a preset field of view angle.

[0032] It should be noted that the two-dimensional pupil expansion technology can increase the eyebox (tolerance of eye placement) and exit pupil distance by optimizing the design and structure of the optical waveguide, thereby achieving a larger field of view and providing users with a wider and more coherent field of view, allowing users to move their eyes freely over a larger range without losing a clear image window.

[0033] Among them, the enlargement of the Eyebox means that users do not need to strictly align the optical waveguide to see a clear image, which improves the comfort and natural feeling of use.

[0034] It should be noted that the optical waveguide 103 of the embodiment of the present application adopts a large-format optical waveguide module, which has the display effect of ultra-thin, large field of view, and long virtual image viewing distance. For example, the optical waveguide 103 of the embodiment of the present application processes about 21011 nano units on the waveguide surface of 20cm*20cm. Hundreds of billions of nano units bend and conduct the light countless times, and transmit the light through the waveguide and reflect it through the windshield into the human eye, and the projection distance can be greater than 15 meters.

[0035] Therefore, the embodiment of the present application can project the screen image to a far distance, even to infinity. When used for a long time, the eye muscles are in a relaxed state and will not produce fatigue, so that the eyes are well protected and not prone to myopia.

[0036] Among them, the embodiment of the present application adopts a fully transparent optical waveguide micro-nano structure, so that objects on the back can also enter the human eye.

[0037] Reference Figure 1As shown, an optical waveguide display device 100 provided in an embodiment of the present application includes a protective shell 101 and an optical machine 102 and an optical waveguide 103 disposed in the protective shell 101. The image light beam output by the optical machine 102 in the embodiment of the present application is coupled into the optical waveguide 103 by the coupling-in region 104 of the optical waveguide 103 and emitted by the coupling-out region 105. The optical waveguide 103 has an expansion region, so that the image light beam has a larger field of view when emitted from the coupling-out region 105, so that a larger image can be projected. In the embodiment of the present application, a display window 106 is disposed at a position of the protective shell 101 corresponding to the coupling-out region 105 of the optical waveguide 103, and the image light beam emitted from the coupling-out region 105 is projected to the outside of the protective shell 101 through the display window 106 at a preset field of view.

[0038] Compared with the prior art, the display screen inside the traditional PAD is removed. The embodiment of the present application increases the pupil distance through the setting of the optical waveguide 103, which helps to reduce the image defocus caused by the normal movement of the eyeball, improves the viewing continuity and depth perception, thereby improving the comfort and natural feeling of the user in viewing the image, which is conducive to relieving eye fatigue and enhancing the immersive experience. In addition, compared with the traditional display screen, the display device provided by the embodiment of the present application has a strong privacy. Since the image light is highly directional, the human eye cannot see the screen image outside the light cone area projected by the display window 106, that is, the image cannot be seen around the optical waveguide display device 100.

[0039] It should be noted that the optical waveguide display device 100 provided in the embodiment of the present application can be used not only in tablet computer products, but also in other devices that need to display images.

[0040] Reference Figure 2 As shown, as an optional embodiment, the coupling region 104 is arranged on the side of the optical waveguide 103 away from the display window 106; the optical waveguide display device 100 also includes a reflector 107, and the image light beam emitted by the optical machine 102 is reflected by the reflector 107 and then enters the optical waveguide 103 through the coupling region 104.

[0041] The coupling-in region 104 of the embodiment of the present application is arranged on the side of the optical waveguide 103 away from the display window 106, and the coupling-out region 105 is arranged on the side of the optical waveguide 103 close to the display window 106. The embodiment of the present application can reflect the image light beam emitted by the optical machine 102 through the reflector 107, and the image light beam is reflected by the reflector 107 and is incident on the coupling-in region 104.

[0042] The reflector 107 provided in the embodiment of the present application enables the optical engine 102 and the optical waveguide 103 to be compactly arranged in the protective housing 101. Adjustment of the optical path of the image light beam by the reflector 107 is conducive to achieving a compact design of the entire structural layout, thereby making the optical waveguide display device 100 smaller in size and easier to carry.

[0043] Reference Figure 2 As shown, as an optional implementation, a driving motor 108 is disposed in the protective shell 101, and a driving end 109 of the driving motor 108 is connected to the reflector 107 for driving the reflector 107 to rotate, and the rotation axis of the reflector 107 is perpendicular to the main optical axis of the image light beam.

[0044] In the embodiment of the present application, a driving motor 108 is installed in the protective housing 101, and the reflector 107 can be driven to rotate by the setting of the driving motor 108. In the embodiment of the present application, the image beam formed by the optical machine 102 can be reflected to other directions by the rotation of the reflector 107, so that the image beam emitted by the optical machine 102 does not enter the optical waveguide 103, and can be directly projected outward for imaging.

[0045] Illustratively, in the embodiment of the present application, the reflector 107 can be driven to rotate 90° by driving the motor 108 , so that the image light beam is emitted in a direction parallel to the plane where the optical waveguide 103 is located, and is projected to the outside.

[0046] Illustratively, in the embodiment of the present application, the reflector 107 can be driven to rotate 180° by driving the motor 108 , so that the image light beam is emitted in the opposite direction of the incident light waveguide 103 and projected outward.

[0047] It should be noted that those skilled in the art can specifically set the rotation angle of the reflector 107 driven by the drive motor 108 according to actual needs, and there is no special limitation on this.

[0048] Reference Figure 2 As shown, as an optional implementation, an operating component electrically connected to the optical engine 102 is disposed in the protective shell 101 , and an operating window 110 is also opened on the protective shell 101 , and the operating component is exposed in the operating window 110 .

[0049] Furthermore, in the embodiment of the present application, an operation window 110 is provided on the protective shell 101 . The operation window 110 and the display window 106 may be arranged in the same plane, or the operation window 110 and the display window 106 may be arranged in different planes.

[0050] Exemplarily, the operation window 110 is disposed on the surface of the protective housing 101 and is located on the same surface as the display window 106 . This arrangement facilitates operation by the user when performing projection imaging.

[0051] Exemplarily, the operation window 110 and the display window 106 are disposed on adjacent surfaces of the protective housing 101 .

[0052] As an optional implementation, the operating component is a touch panel 111 embedded in the operating window 110 , and the plane where the touch panel 111 is located is flush with the plane where the operating window 110 is located.

[0053] Furthermore, the operating component of the embodiment of the present application adopts a touch panel 111 embedded in the operating window 110. The plane where the touch panel 111 is located is flush with the plane where the operating window 110 is located, which is conducive to making the outer surface of the protective housing flat as a whole.

[0054] Reference Figure 2 , Figure 3 As shown, illustratively, the protective shell 101 includes a lower shell 112 and an upper cover plate 113 which are engaged with each other to form a receiving chamber; the operation window 110 and the display window 106 are opened on the upper cover plate 113 .

[0055] As an optional embodiment, a middle mounting plate 114 is sandwiched between the lower shell 112 and the upper cover plate 113, and a recess 115 is provided on the side of the middle mounting plate 114 close to the upper cover plate 113, the recess 115 faces the upper cover plate 113, and the optical waveguide 103 is embedded in the recess 115 and the upper surface is flush with the surface of the upper cover plate 113.

[0056] The present application sets a middle mounting plate 114 between the lower shell 112 and the upper cover plate 113. The middle mounting plate 114 can form a frame in the middle of the protective shell 101. The embodiment of the present application sets a recessed platform 115 on the side of the middle mounting plate 114 close to the upper cover plate 113. The optical waveguide 103 can be reliably fixed and protected by the recessed platform 115, which is beneficial to improving the safety and reliability of the optical waveguide 103.

[0057] It should be noted that the optical waveguide 103 is embedded in the concave platform 115 and the upper surface is flush with the surface of the upper cover plate 113 , which is beneficial to reducing the thickness of the entire device and ensuring the light and thin characteristics of the optical waveguide display device 100 .

[0058] It should be noted that the middle mounting plate 114 has a channel corresponding to the coupling-in area 104 , and the image light beam can pass through the channel and enter the coupling-in area 104 .

[0059] Reference Figure 2 As shown, as an optional implementation, a heat sink 116 is provided between the optical engine 102 and the protective shell 101 , and one side of the heat sink 116 is in contact with the surface of the optical engine 102 , and the other side is in contact with the inner wall of the protective shell 101 .

[0060] Since the optical engine 102 generates a large amount of heat during operation, in order to prevent heat accumulation from causing the optical engine 102 to be overheated and unable to work normally or be damaged, an embodiment of the present application is provided with a heat sink 116 between the optical engine 102 and the protective shell 101. The heat can be dissipated through the heat sink 116 to prevent the optical engine 102 from being overheated.

[0061] Exemplarily, heat sink 116 1 and heat sink 116 2 are arranged between optical machine 102 and middle mounting plate 114, which are in contact with LED lamp circuit board of optical machine 102. Heat generated by optical machine 102 is conducted to the external environment along LED lamp circuit board of optical machine 102, heat sink 116 1 and heat sink 116 2, and along the extension direction of middle mounting plate 114, so that heat generated by optical machine 102 can be conducted to the external environment, thereby preventing optical machine 102 from malfunctioning or burning due to excessive temperature.

[0062] Reference Figure 2 As shown, as an optional implementation, a control mainboard 117 and a wiring harness connecting the control mainboard 117 and the optical engine 102 are disposed in the protective shell 101; the control mainboard 117 is disposed in a plane parallel to the plane where the optical waveguide 103 is located.

[0063] In the embodiment of the present application, a power module is also provided in the lower housing 112 for supplying power to the optical machine 102 and electrical components such as operating components.

[0064] The embodiment of the present application uses the reflector 107 to reduce the thickness of the entire device, making the entire optical waveguide display device 100 more compact. The optical waveguide 103 can magnify the image, and its transparent characteristics can realize the AR function. The reflector 107 allows the image of the optical machine 102 to be imaged not only through the optical waveguide 103, but also directly projected to the outside world to generate an image, expanding the product usage scenarios.

[0065] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical waveguide display device, characterized in that: The invention comprises a protective shell and an optical machine and an optical waveguide arranged in the protective shell. The image light beam output by the optical machine is coupled into the optical waveguide through a coupling-in region of the optical waveguide and emitted from a coupling-out region. A display window is arranged at a position of the protective shell corresponding to the coupling-out region of the optical waveguide. The image light beam emitted from the coupling-out region is projected to the outside of the protective shell through the display window at a preset field of view angle.

2. The optical waveguide display device according to claim 1, characterized in that: The coupling-in region is arranged on a side of the optical waveguide away from the display window; the optical waveguide display device further comprises a reflector, and the image light beam emitted by the optical machine is reflected by the reflector and then enters the optical waveguide from the coupling-in region.

3. The optical waveguide display device according to claim 2, characterized in that: A driving motor is arranged in the protective shell, and a driving end of the driving motor is connected to the reflector for driving the reflector to rotate, and a rotation axis of the reflector is perpendicular to the main optical axis of the image light beam.

4. The optical waveguide display device according to claim 1, characterized in that: An operating component electrically connected to the optomechanical device is disposed in the protective shell, and an operating window is also provided on the protective shell, through which the operating component is exposed.

5. The optical waveguide display device according to claim 4, characterized in that: The operating component is a touch panel embedded in the operating window.

6. The optical waveguide display device according to claim 4, characterized in that: The protective shell includes a lower shell and an upper cover plate which are buckled together to form an accommodating chamber; the operating window and the display window are arranged on the upper cover plate.

7. The optical waveguide display device according to claim 6, characterized in that: A middle mounting plate is sandwiched between the lower shell and the upper cover plate. A concave platform is provided on one side of the middle mounting plate close to the upper cover plate. The concave platform faces the upper cover plate, and the optical waveguide is embedded in the concave platform.

8. The optical waveguide display device according to claim 7, characterized in that: The middle mounting plate has a channel corresponding to the coupling-in area, and the image light beam can pass through the channel and enter the coupling-in area.

9. The optical waveguide display device according to any one of claims 1 to 8, characterized in that: A heat sink is arranged between the optical engine and the protective shell, one side of the heat sink is in contact with the surface of the optical engine, and the other side of the heat sink is in contact with the inner wall of the protective shell.

10. The optical waveguide display device according to any one of claims 1 to 8, characterized in that: A control mainboard and a wiring harness connecting the control mainboard and an optical machine are arranged in the protective shell; the control mainboard is arranged on a plane parallel to the plane where the optical waveguide is located.

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