A compact, large-field-of-view near-eye display device based on total reflection

Abstract

The present invention discloses a compact near-eye display device with a large viewing angle based on total reflection, which utilizes a total reflection prism to transmit light emitted by an image source, and finally amplifies the image through a near-eye refractive component, thereby achieving a near-eye display effect with a large viewing angle in a compact volume.

Description

Technical Field

[0001] The present invention relates to the field of near-eye display devices, and in particular to a compact near-eye display device with a large viewing angle based on total reflection. Background Art

[0002] In a near-eye display system, if a large field of view display effect is to be achieved, a larger aperture imaging system is generally required. However, the focal length of a large aperture imaging system is generally not too small. The focal length represents the axial thickness of the near-eye display device. Therefore, under the current state of the industry, it is not easy to produce a slim and compact large field of view glasses-type display.

[0003] The present invention proposes a new idea. On the basis of maintaining a large aperture of the imaging system, a total reflection prism is used to conduct one or more total reflections of the light emitted by the image source, thereby extending the light propagation path. Finally, the image is amplified through a near-eye refractive component to achieve a near-eye display effect with a larger field of view. At the same time, the overall thin sheet shape of the device is maintained, which is more suitable for manufacturing lightweight and portable eyeglass-type display products. Summary of the invention

[0004] The present invention provides a compact near-eye display device with a large viewing angle, which realizes a relatively large viewing angle by utilizing a total reflection prism and a near-eye refractive component through total reflection conduction and terminal magnification.

[0005] The technical solution of the present invention is a compact near-eye display device with a large field of view based on total reflection, which utilizes a total reflection prism to conduct one or more total reflections of light emitted by an image source, and finally amplifies the image through a near-eye refractive component, thereby achieving a near-eye display effect with a large field of view in a compact volume.

[0006] Preferably, the main reflection surface contained in the total reflection prism forms an angle of about 30° with the image source, the secondary reflection surface forms an angle of about 30° with the near-eye refractive component, the image source and the near-eye refractive component are placed parallel, and there is a gap layer between the image source, the near-eye refractive component and the total reflection prism. The gap layer contains a material (such as air) with a lower refractive index than the total reflection prism, so that light can be totally reflected and transmitted on the inner surface of the total reflection prism.

[0007] Preferably, the image source is a liquid crystal display, a light emitting diode display, an organic light emitting diode display, a reflective display, a diffraction light source, a projector, a light beam generator, a laser, a light modulator or other imaging and light emitting device.

[0008] Preferably, the near-eye refractive component can be a positive focal length lens, a reflective diopter, a polarized dual-focal length lens, a refractive reflective diopter, or a polarized dual-reflective diopter.

[0009] Preferably, the near-eye refractive component can allow external light to pass through without refractive power, and the secondary reflective surface is semi-reflective (such as a semi-reflective film, a polarization splitting layer, or an air layer), so that the human eye can see the displayed image while seeing the external environment through the near-eye refractive component and the total reflection prism, thereby achieving an augmented reality semi-transparent display effect.

[0010] Preferably, the total reflection prism has different shapes, and can produce one, two, or three total reflections in the process of transmitting light, thereby forming different total reflection optical systems.

[0011] Preferably, the compensation surface of the total reflection prism facing away from the near-eye refractive component adopts a curved surface (spherical, aspherical or other curved surface), thereby producing a certain refractive power, which can cooperate with the refractive surface of the near-eye refractive component to perform refractive adjustment on the internal display light and the external ambient light, and can adapt to users with different vision.

[0012] Preferably, the near-eye display device adopts a combination of two sets of total reflection optical systems, which are placed in front of the human eyes. The two sets of total reflection optical systems project light from different directions, and finally two display screens are spliced ​​to achieve a larger field of view display effect.

[0013] Preferably, the near-eye display device adopts a combination of two sets of total reflection optical systems, which are overlapped and placed in front of the human eyes. The polarization states of the light of the two sets of total reflection optical systems are different. The two light beams come from different areas of the same image source. Through different combinations of polarization splitting layers or polarization filters, the light paths of the two optical systems do not interfere with each other. Finally, the two display screens are spliced ​​to achieve a display effect with a larger field of view angle.

[0014] Preferably, the near-eye display device adopts a combination of two sets of total reflection optical systems, which are overlapped and placed in front of the human eyes. The polarization states of the light of the two sets of total reflection optical systems are different. The two light rays come from the same area of ​​the same image source at different times (need to be combined with a fast-switching polarizing filter or a fast-switching shutter). Through different combinations of polarization splitting layers or polarizing filters, the light paths of the two optical systems do not interfere with each other, and finally the two display screens are spliced ​​to achieve a display effect with a larger field of view angle.

[0015] Beneficial effects of the invention: The invention discloses a compact near-eye display device with a large field of view based on total reflection, which utilizes a total reflection prism to perform one or more total reflection transmission on the light emitted by an image source, and finally amplifies the image through a near-eye refractive component, thereby achieving a near-eye display effect with a large field of view in a compact volume.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary illustrations and explanations and should not be used as limitations on the content of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] With reference to the accompanying drawings, further objects, functions and advantages of the present invention will be clarified through the following description of embodiments of the present invention, in which:

[0018] Figure 1 The structure of a compact near-eye display device with a large viewing angle based on total reflection is schematically shown;

[0019] Figure 2a to Figure 2f Shown are schematic diagrams of various types of specific structures of total reflection prisms and near-eye refractive components in a compact, large-viewing-angle near-eye display device based on total reflection according to the first embodiment of the present invention.

[0020] Figure 3a to Figure 3f Shown are various types of specific structural schematic diagrams of the total reflection optical system in the compact, large-viewing-angle near-eye display device based on total reflection according to the second embodiment of the present invention.

[0021] Figure 4a to Figure 4b The diagram shows a situation in which the total reflection prism in the compact large viewing angle near-eye display device based on total reflection according to the third embodiment of the present invention includes a compensation surface.

[0022] Figure 5a to Figure 5d It is a schematic diagram showing the situation where the total reflection prism in the compact large viewing angle near-eye display device based on total reflection according to the fourth embodiment of the present invention does not include a main reflection surface.

[0023] Figure 6a to Figure 6d FIG. 4 is a schematic structural diagram of a near-eye display device using two sets of total reflection optical systems in combination according to the fifth embodiment of the present invention.

[0024] Figure 7a to Figure 7c The figure shows the structure of a narrow-frame near-eye display device using two sets of total reflection optical systems (including two total reflections) in a separate combination according to the sixth embodiment of the present invention.

[0025] Figure 8 FIG. 1 is a schematic structural diagram of a near-eye display device using two sets of total reflection optical systems (including curved secondary reflection surfaces) in a separate combination according to the seventh embodiment of the present invention.

[0026] Fig. 9 The figure shows a specific structural schematic diagram of a narrow-frame near-eye display device using two sets of total reflection optical systems (excluding the main reflection surface) in separate combinations according to the eighth embodiment of the present invention.

[0027] Figure 10a to Figure 10b It is a general schematic diagram of the structure of a narrow-frame near-eye display device using two sets of total reflection optical systems (excluding the main reflection surface) in a separate combination according to the ninth embodiment of the present invention.

[0028] Figure 11a to Figure 11b It is a schematic structural diagram of a near-eye display device according to the tenth embodiment of the present invention, which adopts an overlapping combination of two sets of total reflection optical systems (including two total reflections) in which light comes from different areas of the image source.

[0029] Figure 12a to Figure 12c It is a schematic structural diagram of a near-eye display device of the 11th embodiment of the present invention, which adopts an overlapping combination of two sets of total reflection optical systems (including multiple total reflections) in which light comes from different areas of the image source.

[0030] Figure 13a to Figure 13b The figure shows the structure of a near-eye display device according to the twelfth embodiment of the present invention, which uses an overlapping combination of two total reflection optical systems (including multiple total reflections) in which light comes from the same area of ​​an image source at different times. DETAILED DESCRIPTION

[0031] By referring to the exemplary embodiments, the objects and functions of the present invention and the methods for achieving these objects and functions will be explained. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The essence of the description is only to help those skilled in the relevant art to comprehensively understand the specific details of the present invention.

[0032] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0033] Figure 1 The structure diagram of a compact, large-viewing-angle near-eye display device based on total reflection is schematically shown. Figure 1 As shown, a compact large-field-of-view near-eye display device based on total reflection includes a total reflection prism 101, a main reflection surface 102 included in the total reflection prism 101 forms an angle of about 30° with an image source 103, a secondary reflection surface 104 forms an angle of about 30° with a near-eye refractive component 105, the image source 103 and the near-eye refractive component 105 are placed parallel to each other, and there is a gap layer 106 between the image source 103, the near-eye refractive component 105 and the total reflection prism 101. The gap layer 106 contains a material (such as air) with a lower refractive index than the total reflection prism 101, so that light can be totally reflected and transmitted on the inner surface of the total reflection prism 101.

[0034] The light emitted from the total reflection prism 101 is magnified by the near-eye refractive component 105 and can be seen clearly by the human eye 107, thereby achieving a near-eye display effect with a large field of view in a compact volume.

[0035] The image source 103 is a liquid crystal display, a light emitting diode display, an organic light emitting diode display, a reflective display, a diffraction light source, a projector, a light beam generator, a laser, a light modulator or other imaging and light emitting device.

[0036] Example 1

[0037] Figure 2a to Figure 2f Shown are schematic diagrams of various types of specific structures of total reflection prisms and near-eye refractive components in a compact, large-viewing-angle near-eye display device based on total reflection according to the first embodiment of the present invention.

[0038] In this embodiment, the light emitted by the image source is reflected by the secondary reflection surface, enters the near-eye refractive component for image amplification, and finally enters the human eye, thereby achieving a near-eye display effect with a larger field of view angle in a compact volume.

[0039] like Figure 2a As shown, the near-eye refractive component can adopt a positive focal length lens 205a.

[0040] like Figure 2b to Figure 2e As shown, the near-eye refractive component can allow external ambient light 221 to pass through without refractive power, and the secondary reflective surface is semi-reflective (such as a semi-reflective film, a polarization splitting layer, or an air layer), so that the human eye can see the displayed image while seeing the external environment through the near-eye refractive component and the total reflection prism, thereby achieving an augmented reality semi-transparent display effect.

[0041] Specifically:

[0042] like Figure 2b As shown, the near-eye refractive component can use a reflective refractor 205b. As a preferred method, in order to prevent the transmitted light 211 after the light passes through the secondary reflective surface 204b, after being reflected at the end surface 212, it is reflected again by the secondary reflective surface and enters the human eye, generating stray light. The following solutions are available:

[0043] (1) The end surface 212 is coated with an anti-reflection film to prevent light from being reflected on the inner surface;

[0044] (2) The end surface 212 is treated with a surface treatment method to prevent light reflection;

[0045] (3) adding an anti-reflection film to the near-eye surface 213 to prevent the light from being totally reflected on the inner surface, thereby avoiding stray light;

[0046] (4) The secondary reflection surface 204b adopts a polarization beam splitter, so that the light transmitted through it will still be completely transmitted when it is reflected back later, and will not be reflected on the secondary reflection surface 204b; at this time, in order to ensure that the light reflected by the reflective diopter 205b can pass through the secondary reflection surface 204b, a polarization changer (which can be a depolarizing film, a quarter wave plate, a half wave plate, a 45-degree polarizing plate, etc., which can change the linear polarization of the original light) should be added to the reflective diopter 205b to process the light, and then it can be smoothly reflected into the human eye 207b.

[0047] like Figure 2c1 As shown, the near-eye refractive component can use a polarized dual-focal length lens. The polarized dual-focal length lens uses a polarized dual-focal length lens 205c with a fine structure: including an orthogonal polarized mixed filter 2051c, and a special lens with a fine structure. The surface of the special lens has two different types of A / B surface units mixed, wherein:

[0048] Type A surface 20521: The local refractive property of this microstructure conforms to the refractive law of a short-focus positive lens, so the small-area polarization filter corresponding to the surface only allows display light (which has been processed into polarized light by the display light polarizer 2031c) to pass through;

[0049] Class B surface 20522: This fine structure has no refractive power (or has only a slight refractive power to adapt to the user's vision), so the small area polarization filter corresponding to its surface only allows external ambient light that has been processed into polarized light by the external light polarizer 2211c to pass through.

[0050] like Figure 2c2 There are several examples of the arrangement of the two types of surface units, A / B: A / B spaced ring bands (Fresnel lens-like structure), spaced stripes, checkerboard grids, dot matrix (A-type circular and near-circular surfaces are arranged in a large area together with the B area), A / B spaced equilateral triangle arrays, etc.

[0051] In addition, by using a polarized dual-focal length lens with a diffractive microstructure, different focal lengths can be achieved for light of different polarizations (the focal length for internal display light is positive short focal length, and the focal length for external ambient light is nearly infinite).

[0052] like Figure 2d As shown, the near-eye refractive component can use a refractive reflective diopter 205d. Preferably, in order to further reduce the thickness of the near-eye refractive component, the semi-reflective surface 2050d shown in the figure can be a Fresnel reflective surface, or a certain reflective diffraction microstructure can be used to reflect and refract the internal display light while allowing the external light to pass through without refraction.

[0053] like Figure 2eAs shown, the near-eye refractive component can use a polarized double-reflective refractor 205e. The display light emitted by the image source 203e is processed by the display light polarizer 2031e and becomes a polarized light. When this polarized light enters the polarized double-reflective refractor 205e, it cannot pass directly and will be blocked by the terminal polarizing filter 2051e; the light is reflected twice on two surfaces of the refractor. Since the two surfaces are not parallel but have a certain relative curvature, the two reflections bring about refractive magnification (just enough for the human eye to see clearly). The light finally emitted after two reflections can pass through the terminal polarizing filter 2051e and be seen by the human eye 207e.

[0054] The external ambient light 211 is processed by the external light polarizer 2211e and becomes another polarized light. When this polarized light enters the polarized double-reflecting refractor 205e, it can directly pass through the terminal polarizing filter 2051e. Since no refractive reflection and refractive refraction occur, the human eye 207e can directly see the external light. The light is reflected twice on two surfaces of the refractor and is also amplified by refraction (making it impossible for the human eye to see clearly), but it cannot pass through the terminal polarizing filter 2051e, and therefore will not be seen by the human eye 207e.

[0055] like Figure 2f As shown, a curved secondary reflector 204f is used, which also has a near-eye refractive function, so a separate near-eye refractive component is no longer needed.

[0056] Example 2

[0057] Figure 3a to Figure 3f Shown are various types of specific structural schematic diagrams of the total reflection optical system in the compact, large-viewing-angle near-eye display device based on total reflection according to the second embodiment of the present invention.

[0058] In this embodiment, the total reflection prism 301 has different shapes. The light emitted by the image source can generate one, two, or three total reflections during the light transmission process, thereby forming different total reflection optical systems.

[0059] like Figure 3a , the light undergoes two total reflections.

[0060] like Figure 3b The light undergoes three total reflections and reflection from the end reflection surface 308b.

[0061] like Figure 3c The light undergoes three total reflections and reflection from the end reflection surface 308c.

[0062] like Figure 3d The light undergoes two total reflections and reflection from the end reflection surface 308d.

[0063] like Figure 3e The light undergoes three total reflections and reflections from the end reflection surfaces 3081e and 3082e.

[0064] like Figure 3f , the light is first reflected by the reflective refractive component 3031f at the light source end, and is enlarged or reduced, and then is conducted and refraction is performed by the near-eye refractive component 305f, and finally becomes light that can be seen clearly by the human eye. Through this structure, the optical system can pre-process the light emitted by the image source (for example, enlarging the light can save space and increase the viewing angle, and reducing the light can improve the clarity), so as to be more suitable for various different usage requirements.

[0065] Example 3

[0066] Figure 4a to Figure 4b The diagram shows a situation in which the total reflection prism in the compact large viewing angle near-eye display device based on total reflection according to the third embodiment of the present invention includes a compensation surface.

[0067] The compensation surface is a curved surface, which is located on the side of the total reflection prism facing away from the near-eye refractive component. A curved surface (spherical, aspherical or other curved surface) is used to produce a certain refractive power, which can cooperate with the refractive surface of the near-eye refractive component to perform refractive adjustment on the internal display light and the external ambient light, and can adapt to users with different vision.

[0068] like Figure 4a , a positive focal length lens 405a is used as a near-eye refractive component, so that the compensation surface 409a has a refractive reduction effect on the outside to offset the refractive magnification effect of the positive focal length lens 405a, so that the human eye 407a can see the outside world clearly.

[0069] Preferably, in order to adapt to users with different vision, the curvature of each optical surface can be adjusted or replaced: if the curvature of the compensation surface 409a is greater than the curvature of the refractive surface 4050a, the external refractive power of the entire optical system is equivalent to a hyperopia lens; if the curvature of the compensation surface 409a is less than the curvature of the refractive surface 4050a, the external refractive power of the entire optical system is equivalent to a myopia lens.

[0070] like Figure 4b , a refractive reflective diopter 405b is used as a near-eye refractive component, so that the compensation surface 409b has a refractive reduction effect on the inner side to offset the refractive magnification effect of the refractive reflective diopter 405b, so that the human eye 407b can see the outside world clearly.

[0071] Preferably, in order to adapt to users with different vision, the curvature of each optical surface can be adjusted or replaced: if the curvature of the compensation surface 409b is greater than the curvature of the refractive surface 4050b, the external refractive power of the entire optical system is equivalent to a hyperopia lens; if the curvature of the compensation surface 409b is less than the curvature of the refractive surface 4050b, the external refractive power of the entire optical system is equivalent to a myopia lens.

[0072] Preferably, in order to further reduce the thickness of the near-eye refractive component, Figure 4a The positive focal length lens 405a shown in the figure is a Fresnel lens, or a positive focal length diopter with a certain diffraction microstructure; Figure 4b The refractive-reflective diopter 405b shown in the figure adopts a Fresnel reflective surface, or adopts a certain reflective-diffractive microstructure, which reflects and refracts the internal display light while allowing the external light to pass through without refraction.

[0073] Example 4

[0074] This embodiment is an improvement of Embodiment 1.

[0075] Figure 5a to Figure 5d It is a schematic diagram showing the situation where the total reflection prism in the compact large viewing angle near-eye display device based on total reflection according to the fourth embodiment of the present invention does not include a main reflection surface.

[0076] like Figure 5a On the basis of Example 1, the main reflection surface is removed, the image source 503a and the secondary reflection surface 504a are about 90 degrees, the image source 503a and the human eye horizontal visual axis 5111 are about 30 degrees, and a reflective refractive component 505a is used. The advantage of this solution over Example 1 is that the image source 503a can be made approximately parallel to the human eye line of sight, so that the projection surface of the image source 503a in the natural visual angle 540 of the human eye is smaller, and the resulting visual field occlusion area 541a is also smaller, thus forming a visual "narrow frame" effect.

[0077] like Figure 5b ,exist Figure 5a On the basis of the invention, a special refractive reflective diopter and a compensation surface 509b are used, so that the refractive structure composed of the compensation surface 509b and the reflective inner refractive surface 5051b refracts internally; the refractive structure composed of the compensation surface 509b and the refractive outer refractive surface 5052b refracts externally. When the diopter of the compensation surface 509b and the refractive outer refractive surface 5052b are combined in different ways, it can adapt to users with different vision.

[0078] like Figure 5c ,exist Figure 5bOn the basis of this, using a compensation surface 509c with a smaller curvature can extend the compensation surface 509c to be close to the image source 503c, thereby further reducing the projection of the non-light-transmitting surface, forming a smaller field of view blocking area 541c, and forming a better "narrow frame" effect.

[0079] like Figure 5d ,exist Figure 5c On this basis, a similar “narrow border” effect can be achieved by adjusting the angle between the image source 503d and the eye level visual axis 5111 to close to 45°.

[0080] Example 5

[0081] Figure 6a to Figure 6d FIG. 4 is a schematic structural diagram of a near-eye display device using two sets of total reflection optical systems in combination according to the fifth embodiment of the present invention.

[0082] In order to prevent the light from the two optical systems from crosstalking, an optical path isolation is set between the two total reflection prisms. There are four solutions for isolating the optical path:

[0083] like Figure 6a : Add a polarization isolation layer 6041a to block light crosstalk.

[0084] like Figure 6b : Using an anti-total reflection surface 6091b, such as coating an anti-reflection film on its surface, so that the crosstalk light cannot be totally reflected on the inner surface, and thus cannot continue to propagate;

[0085] like Figure 6c : Two polarization splitting layers 6042c with the same properties are used, so that after light passes through one layer, it cannot be reflected on the surface of the other layer, but will be transmitted through;

[0086] like Figure 6d When using the reflective refractive component 6051d, in order to ensure that the light passing through the component can pass through the polarization splitting layer 6042d, it is necessary to destroy (or change) the polarization of the light. A polarization changer 6050d (which can be a depolarizing film, a quarter-wave plate, a half-wave plate, a 45-degree polarizing plate, or other materials that can change the linear polarization of the original light) can be used to process the light, and then it can be smoothly reflected into the human eye 607d.

[0087] Example 6

[0088] In this embodiment, two sets of total reflection optical systems are combined and placed in front of the eyes of the person, that is, the near-eye display device includes two sets of total reflection prisms and two image sources, and the two sets of total reflection prisms and the two image sources are placed in front of the eyes of the person. The two sets of total reflection optical systems project light from different directions, and finally two display screens are spliced ​​to achieve a larger field of view display effect.

[0089] Figure 7a to Figure 7c The figure shows the structure of a narrow-frame near-eye display device using two sets of total reflection optical systems (including two total reflections) in a separate combination according to the sixth embodiment of the present invention.

[0090] like Figure 7a On the basis of Example 5, a total reflection optical system structure with two total reflections is adopted, and the main reflection surface 702a is a semi-reflection structure, and a reflective refractive surface 7051a is selected, so that the image source 703a is located on one side of the human eye 707a. Through the special structural design as shown in the figure, the projection surface of the image source 703a in the human eye field can be smaller and as far away from the center of the line of sight as possible, so the field of view blocking area 741a is also smaller, thereby forming a visual "narrow frame" effect.

[0091] like Figure 7b , as a preference, can be Figure 7a On the basis of the above, a series of edge display light points 7053b (which can be LEDs, OLEDs or other self-luminous, light-guiding, and reflective devices) are embedded in the transparent part of the lens to form an edge display light point array 7054b, which can display an image that matches the central display area 743b. Since the light point array is relatively sparse, external light can be allowed to pass through, and the displayed image clarity is also very low. In addition, the light source is too close to the human eye, and the display blur is very high. Therefore, it can only be used to display very rough edge images, providing an edge amplified field of view 742b, thereby expanding the user's visual perception area, so as to provide a more immersive visual experience.

[0092] like Figure 7c , the outer surface of the near-eye display device can be a flat surface or a curved surface, and the near-eye surface 709c can be a flat surface or a curved surface. In order to prevent the light of the two optical systems from crosstalking, the near-eye surface 709c can be set as an anti-total reflection surface. The specific solution is to add an anti-reflection film to prevent the light from being totally reflected on the inner surface, thereby blocking the light from continuing to propagate; in addition, a combination of a polarization splitting layer and a polarization changer can be used to isolate the optical path (similar to Figure 6d ).

[0093] Example 7

[0094] Figure 8FIG. 8 is a schematic structural diagram of a near-eye display device using two sets of total reflection optical systems (including a curved secondary reflection surface 804) in a separate combination according to the seventh embodiment of the present invention.

[0095] Preferably, in order to prevent crosstalk between the light of the two optical systems, an anti-total reflection surface 809 may be provided.

[0096] Example 8

[0097] Fig. 9 The figure shows a specific structural schematic diagram of a narrow-frame near-eye display device using two sets of total reflection optical systems (excluding the main reflection surface) in separate combinations according to the eighth embodiment of the present invention.

[0098] As shown in the figure, the characteristic is that, on the basis of Example 5, the main reflection surface is removed, the image source 903 and the secondary reflection surface 904 (in this embodiment, the polarization beam splitting layer) are about 90°, the image source 903 and the human eye horizontal visual axis 9111 are about 30°, the human eye 907 is about 12 mm away from the optical system, and the corresponding longitudinal visual angle for the optical system is about 96°, which can just make the edge sight line 9411 after refraction by the compensation surface 909 (assuming the refractive index is 1.5 and the compensation surface 909 is a plane) be approximately parallel to the image source 903, thereby reducing the projection area of ​​the image source 903 in the human eye field, reducing the user's field of view occlusion area 941, forming a "narrow frame" glasses visual effect, and ensuring the safety of the user. By changing the curvature (diopter) of the compensation surface 909 or the refractive diopter 9052, the optical system can be adapted to users with different vision.

[0099] Similarly, in order to prevent crosstalk between the two optical systems, the diagram shows a polarization splitting layer in combination with a polarization changer 9050 to isolate the optical path; in addition, the compensation surface 909 can also be set as an anti-total reflection surface, such as adding an anti-reflection film to prevent total reflection of light on the inner surface, thereby blocking the light from continuing to propagate.

[0100] Likewise, similar Figure 7b In this embodiment, edge display luminous point arrays may be added to the upper and lower sides of the central display area to expand the user's visual perception area.

[0101] Example 9

[0102] Figure 10a to Figure 10b It is a general schematic diagram of the structure of a narrow-frame near-eye display device using two sets of total reflection optical systems (excluding the main reflection surface) in a separate combination according to the ninth embodiment of the present invention.

[0103] This embodiment is the general situation of embodiment 8. The actual situation is Fig.10a , abstracted into a pure geometric relationship Fig.10b .

[0104] In the near-eye display device, the distance between the human eye and the optical system is generally 12-25 mm, which is set as d. The refractive index of the material is set as n. The angle between the image source 1003 and the horizontal visual axis 10111 of the human eye is set as α. The visual angle of the human eye is set as θ.

[0105] When the following restrictions are met:

[0106] arcsin[(sinθ / 2) / n]≤α≤θ / 2,

[0107] It can ensure that the image source 1003 is always within the angle between the inner edge sight line 10411 and the outer edge sight line 10412, so no additional sight line obstruction is generated, and a smaller sight line blocking area 1041 is maintained, forming a narrow-frame glasses visual effect.

[0108] Assume that the angle between the secondary reflection surface 1004 and the horizontal visual axis 10111 of the human eye is β,

[0109] When the following restrictions are met:

[0110] β=45°+α / 2,

[0111] It can be ensured that the light reflected by the secondary reflection surface 1031 is substantially parallel to the horizontal visual axis 10111 of the human eye.

[0112] The distance between the two secondary reflection surface reflected lights 1031 formed by the light emitted from the center of the image source 1003 in the upper and lower optical systems is h', and the width of the image source is h, and the following geometric relationship exists:

[0113] h*cosα=[d*tan(θ / 2)+h*sinα-h / 2 / sinα-h' / 2]*tanα+[d*tan(θ / 2)-h' / 2] / tanβ

[0114] roll out

[0115] h*[cosα-tanα*sinα+tanα / 2 / sinα]

[0116] =d*tan(θ / 2)*tanα+d*tan(θ / 2) / tanβ-h'*[tanα / 2+1 / 2 / tanβ]

[0117] Substituting the actual data, h' can be calculated.

[0118] When the following restrictions are met:

[0119] 0.5h≤h'≤0.85h,

[0120] It can ensure that the images displayed by the upper and lower optical systems overlap slightly in the human eye's field of vision, and a smooth transition can be achieved through the special configuration of the two images.

[0121] Preferably, h'≈0.85h is considered. The following sets of priority parameter configurations can be obtained:

[0122] Take α=45°, n=1.7, d=15mm, θ=90°, h=16.5, h'=13.5;

[0123] Or α=45°,n=1.50,d=12mm,θ=75°,h=10,h'=8.41;

[0124] Or α=30°,n=1.74,d=12mm,θ=100°,h=10.1,h'=8.4;

[0125] Or α=38°,n=1.60,d=15mm,θ=96°,h=14.3,h'=12.1;

[0126] Or α=50°, n=1.60, d=15 mm, θ=100°, h=23.6, h'=20.3.

[0127] Example 10

[0128] Figure 11a to Figure 11b It is a schematic structural diagram of a near-eye display device according to the tenth embodiment of the present invention, which adopts an overlapping combination of two sets of total reflection optical systems (including two total reflections) in which light comes from different areas of the image source.

[0129] like Fig.11a Or 11b, the near-eye display device includes two sets of total reflection prisms (two sets of total reflection optical systems), which are combined by two sets of total reflection optical systems and overlapped and placed in front of the human eyes. The polarization states of the light of the two sets of total reflection optical systems are different (generally two mutually orthogonal linear polarized lights, represented by two different types of arrow lines in the figure: dotted line "-.-.-.-." and dotted line "--------"), and the two light rays come from different areas of the same image source 1103. The light paths of the two optical systems do not interfere with each other through the polarizer 11031 and the polarization filter 11051, and finally the two display screens are spliced ​​to achieve a larger field of view display effect.

[0130] Preferably, in order to ensure a smooth transition between the two images, the images reflected by the two sub-reflection surfaces 1104 should partially overlap, that is, the distance between the two sub-reflection surfaces 1104 should be relatively large. Fig.11a Or it is smaller as shown in 11b; or the two sub-reflection surfaces 1104 are not completely parallel, but are staggered at a certain angle (such as 5-15°).

[0131] Embodiment 11

[0132] Figure 12a to Figure 12c It is a schematic structural diagram of a near-eye display device of the 11th embodiment of the present invention, which adopts an overlapping combination of two sets of total reflection optical systems (including multiple total reflections) in which light comes from different areas of the image source.

[0133] This embodiment is an improvement of embodiment 10, which increases the number of total reflections and adds multiple end reflection surfaces 1208.

[0134] As shown in the figure, two sets of total reflection optical systems are combined and overlapped and placed in front of the human eye. The polarization states of the light of the two sets of total reflection optical systems are different (generally two mutually orthogonal linear polarized lights, represented by two different types of arrow lines in the figure: dot-dash line "-.-.-.-." and dotted line "--------"), and the two light rays come from different areas of the same image source 1203. Through different combinations of polarizer 12031, polarization splitter layer 12042, polarization filter 12051 and polarization converter 12050, the light paths of the two optical systems do not interfere with each other, and finally two display screens are spliced ​​to achieve a display effect with a larger field of view.

[0135] Example 12

[0136] Figure 13a to Figure 13b The figure shows the structure of a near-eye display device according to the twelfth embodiment of the present invention, which uses an overlapping combination of two total reflection optical systems (including multiple total reflections) in which light comes from the same area of ​​an image source at different times.

[0137] In this embodiment, the near-eye display device includes two sets of total reflection prisms (two sets of total reflection optical systems), which are combined and placed in front of the eyes of the person. The two sets of total reflection optical systems have different polarization states of light. The two paths of light come from the same area of ​​the same image source at different times, and the two paths of light are generated in the following manner: Fig.13a Using fast switching polarization filter 13032, Fig.13b A fast-switching shutter 13033 is used. Through different combinations of polarization beam splitting layers 13040 or polarization filters 13051, the light paths of the two optical systems do not interfere with each other, and finally two display images are spliced ​​to achieve a larger field of view display effect.

[0138] exist Fig.13aIn the embodiment, a fast-switching polarization filter 13032 is used to make the light emitted by the image source 1303a switch quickly between two polarization states (generally two mutually orthogonal linear polarization lights, represented by two different types of arrow lines in the figure: dot-dash line "-.-.-.-." and dashed line "--------"), and one of the polarization states (represented by dot-dash line "-.-.-.-.") is only reflected on the surface of the polarization splitting layer 13040 without being transmitted, and is reflected downward twice, and then reflected by the end reflection surface 1308a, and then passes through the lower side secondary reflection surface 13042a and then passes through the polarization filter 13051 to enter the near-eye refractive component 1305. a; another polarized light (indicated by the dotted line "--------") is only transmitted on the surface of the polarization splitting layer 13040 without being reflected. It is reflected by the dimming path reflection surface 13081a and passes through the polarization changer 13080a. It is then reflected on the surface of the polarization splitting layer 13040 and then reflected by the end reflection surface 1308a and passes through the polarization changer 13080a. It can then pass through the polarization splitting layer 13040. At this time, the polarization state of the light remains consistent with the light emitted from the image source. Therefore, this beam of light can pass through the upper secondary reflection surface 13041a and then pass through the polarization filter 13051 to enter the near-eye refractive component 1305a.

[0139] exist Fig.11b In the embodiment, two fast switching shutters 13033 are used, which can determine whether light can pass through by quickly switching on and off. At a certain moment, the upper fast switching shutter 13033 is opened (the lower fast switching shutter 13033 is closed), and the light emitted by the image source 1303b passes through the polarization beam splitting layer 13040, can be reflected by the dimming path reflection surface 13081b (at this time, the polarization of the light may have changed), and then passes through a similar Fig.11a The subsequent optical path passes through the upper secondary reflection surface 13041b and enters the near-eye refractive component 13051; at another moment, the lower fast-switching shutter 13033 is opened (the upper fast-switching shutter 13033 is closed), and the light emitted by the image source 1303b is reflected by the polarization splitting layer 13040, undergoes two total reflections downward, and can be reflected by the end reflection surface 1308b (at this time, the polarization of the light may have changed), and finally passes through the lower secondary reflection surface 13042b and enters the near-eye refractive component 13051.

[0140] As a preference, Fig.13a and Fig.13bIn the figure, the light-adjusting path reflection surfaces 13081a and 13081b are not close to the surface of the total reflection prism, and the distance between them needs to be specially designed. For example, when the refractive index of the material is 1.5, the distance is about 0.3 times the thickness of the total reflection prism, thereby ensuring that the optical path of the light of the two light paths from the image source to the final entry into the near-eye refractive component is approximately the same, ensuring the consistency of the imaging plane.

[0141] Other embodiments of the present invention will be readily apparent to those skilled in the art from the description and practice of the invention disclosed herein. The description and embodiments are to be considered exemplary only, and the true scope and spirit of the present invention are to be limited by the claims.

Claims

1. A compact, large-viewing-angle near-eye display device based on total reflection, characterized in that: The display device comprises: A total reflection prism is used to conduct one or more total reflections on the light emitted by the image source. A near-eye refractive component, where the light is reflected once or multiple times before the image is magnified by the near-eye refractive component; There is a gap layer between the near-eye refractive component and the total reflection prism. The gap layer contains a material with a lower refractive index than the total reflection prism, so that the light can be totally reflected and transmitted on the inner surface of the total reflection prism. The device comprises two sets of total reflection prisms and two image sources, which are placed in front of the eyes of a person, project light from different directions, and achieve a larger viewing angle display effect by splicing two display screens; In order to prevent the light in the optical system from crosstalk, optical path isolation is set between the two sets of total reflection prisms; Assume that the angle between the image source and the horizontal visual axis of the human eye is α, and the angle between the secondary reflective surface and the horizontal visual axis of the human eye is β; When the following restriction condition is met: β=45°+α / 2, it can be ensured that the reflected light from the secondary reflection surface is roughly parallel to the horizontal visual axis of the human eye; the distance between the two reflected lights from the secondary reflection surface finally formed by the light emitted from the center of the image source in the two optical systems is h', and the width of the image source is h. When the following restriction condition is met: 0.5h≤h'≤0.85h, it can be ensured that the images displayed by the upper and lower optical systems are slightly overlapped in the human eye's field of vision, and a smooth transition can be achieved through the special configuration of the two images.

2. The near-eye display device according to claim 1, characterized in that: The total reflection prism comprises a primary reflection surface and a secondary reflection surface. The main reflection surface forms an angle of about 30° with the image source, the secondary reflection surface forms an angle of about 30° with the near-eye refractive component, the image source and the near-eye refractive component are placed parallel, and there is a gap layer between the image source and the total reflection prism. The gap layer contains a material with a lower refractive index than the total reflection prism, so that light can be totally reflected and transmitted on the inner surface of the total reflection prism.

3. The near-eye display device according to claim 1, characterized in that: The image source is one or more imaging and light-emitting devices selected from the group consisting of a liquid crystal display, a light-emitting diode display, an organic light-emitting diode display, a reflective display, a diffraction light source, a projector, a light beam generator, a laser, and a light modulator.

4. The near-eye display device according to claim 1, characterized in that: The near-eye refractive component adopts a positive focal length lens, a reflective diopter, a polarized double focal length lens, a refractive reflective diopter or a polarized double reflective diopter.

5. The near-eye display device according to claim 4, characterized in that: The near-eye refractive component allows external light to pass through without refraction, and the secondary reflective surface is semi-reflective, so that the human eye can see the displayed image clearly while seeing the external environment through the near-eye refractive component and the total reflection prism.

6. The near-eye display device according to claim 1, characterized in that: The total reflection prism comprises a compensation surface, The compensation surface is a curved surface, which is located on the side of the total reflection prism facing away from the near-eye refractive component. The refractive surface of the near-eye refractive component cooperates to perform refractive adjustment on the internal display light and the external ambient light.

7. The near-eye display device according to claim 1, characterized in that: The device comprises two sets of total reflection prisms, Two sets of total reflection prisms are placed overlapping in front of the human eyes. Two paths of light from different areas of the same image source are spliced ​​through two display screens to achieve a larger field of view display effect.

8. The near-eye display device according to claim 1, characterized in that: The device comprises two sets of total reflection prisms, Two sets of total reflection prisms are placed overlapping in front of the human eyes. Two paths of light from the same area of ​​the same image source at different times are spliced ​​through two display screens to achieve a larger field of view display effect.

Images