CN217467350U

CN217467350U - Near-to-eye display device and wearable equipment

Info

Publication number: CN217467350U
Application number: CN202221085124.0U
Authority: CN
Inventors: 康雪雪; 赵鑫; 郑昱
Original assignee: Journey Technology Ltd
Current assignee: Journey Technology Ltd
Priority date: 2022-05-05
Filing date: 2022-05-05
Publication date: 2022-09-20
Anticipated expiration: 2032-05-05

Abstract

The utility model is suitable for an optics technical field provides a nearly eye display device and wearing equipment. The near-eye display device comprises an image source, a color combination module, an imaging optical component and a light path conduction module which are sequentially arranged along a light path; the image source is used for providing three paths of monochromatic image light; the color combination module is used for receiving all monochromatic image light and combining the monochromatic image light into a path of color image light; the imaging optical assembly comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the light output direction; the light path conduction module is used for receiving and conducting the light rays output by the imaging optical component and enabling the light rays to exit. Wearing equipment includes above-mentioned near-eye display device. The utility model provides a near-to-eye display device and wearing equipment, it is small, the convenience preferred.

Description

Near-to-eye display device and wearable equipment

Technical Field

The utility model belongs to the technical field of optics, especially, relate to a nearly eye display device and wearing equipment.

Background

Augmented Reality (AR) technology is a technology that skillfully fuses virtual information with the real world. In recent years, the miniaturization and performance advances of electronic image display devices have made it possible to move compact and high performance near-eye display devices to consumers, and how to make such a system truly wearable has presented challenges to near-eye display design. Therefore, a near-eye display device which is small in size, clear in display, high in brightness and comfortable to wear is significant.

In the current full-color near-eye display device, optical elements such as Lcos (Liquid Crystal on Silicon), OLED (Organic Light-Emitting Diode), DLP (Digital Light Processing) and the like are mostly used as micro display sources, but in the micro display sources such as Lcos, an extra illumination Light path is required, which increases the volume of an optical machine, and an active Light-Emitting device such as OLED has a luminance of thousands of nits due to the current technical limitation. However, the current near-eye display device is large in size and poor in convenience.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a nearly eye display device and wearing equipment aims at solving among the prior art nearly eye display device volume great, the relatively poor technical problem of convenience.

The utility model is realized in such a way, in a first aspect, the utility model provides a near-to-eye display device, which comprises an image source, a color combination module, an imaging optical component and a light path conduction module which are arranged along a light path in sequence;

the image source is used for providing three paths of monochromatic image light;

the color combination module is used for receiving all monochromatic image light and combining the monochromatic image light into a path of color image light;

the imaging optical assembly comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the light output direction; the first lens has positive focal power, is a plano-convex lens or a convex-concave lens, and has a plane or a concave surface close to the color combination module and a convex surface close to the image side; the second lens has positive focal power, is a convex-concave lens, and has a convex surface close to the first lens and a concave surface close to the image side; the third lens has negative focal power, and is a biconcave lens; the fourth lens has positive focal power, is a plano-convex lens or a convex-concave lens, and has a plane or a concave surface close to the third lens and a convex surface close to the image side;

the light path conduction module is used for receiving and conducting the light rays output by the imaging optical component and enabling the light rays to be emitted.

In an optional embodiment, the light emitting surface of the first lens is aspheric, the light incident surface of the second lens is aspheric, the light emitting surface of the third lens is spherical, the light incident surface of the third lens is aspheric, and the light emitting surface and the light incident surface of the fourth lens are both aspheric.

In an alternative embodiment, the materials of the first lens, the second lens, the third lens and the fourth lens are respectively optical glass or optical resin.

In an optional embodiment, the imaging optical assembly further comprises a flat glass, and the flat glass is arranged on the light-emitting side of the fourth lens.

In an alternative embodiment, the optical path conducting module includes a geometric array optical waveguide and an incident prism sheet connected to the light input end of the geometric array optical waveguide, and the incident prism sheet is disposed in the light output direction of the imaging optical assembly.

In an alternative embodiment, the exit pupil distance of the imaging optics is greater than or equal to 15 mm.

In an alternative embodiment, the imaging optics has an effective focal length of 6.2mm, a diagonal full field angle of 30 ° and an F-number of 1.25.

In an alternative embodiment, the imaging optics assembly has a diagonal full field angle of 20 ° -40 °.

In an optional embodiment, the image source comprises a first chip for emitting red light, a second chip for emitting green light, and a third chip for emitting blue light, wherein the first chip, the second chip, and the third chip are all Micro-LED chips.

In a second aspect, a wearable device is provided, which includes the near-eye display device provided in the above embodiments.

The utility model discloses technical effect for prior art is: the embodiment of the utility model provides a near-to-eye display device and wearing equipment, including image source, the color combination module, formation of image optics subassembly and the light path conduction module that sets gradually along the light path, wherein the formation of image optics subassembly includes first lens, second lens, third lens and the fourth lens that sets gradually along light output direction, and first lens have positive focal power, and first lens are plano-convex lens or convex-concave lens, and its plane or concave surface are close to the color combination module, and the convex surface is close to the picture side; the second lens has positive focal power, is a convex-concave lens, the convex surface of the convex-concave lens is close to the first lens, and the concave surface of the convex-concave lens is close to the image side; the third lens has negative focal power and is a biconcave lens; the fourth lens has positive focal power, is a plano-convex lens or a convex-concave lens, and has a plane or a concave surface close to the third lens and a convex surface close to the image side. Adopt this structure, make the embodiment of the utility model provides a near-to-eye display device and wearing equipment, small, the convenience preferred, simple structure, light in weight easily makes, and the aberration is rectified better moreover, and the imaging quality is good.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a near-eye display device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the near-eye display device of FIG. 1 with the exception of the light path conduction module;

fig. 3 is a schematic diagram of a Modulation Transfer Function (MTF) value of a near-eye display device according to an embodiment of the present invention;

fig. 4 is a field curvature and distortion diagram of a full-field full-wave band of a near-eye display device according to an embodiment of the present invention, where (a) is the field curvature diagram and (b) is the distortion diagram;

fig. 5 is a dot-column diagram of a full field of view of a near-eye display device according to an embodiment of the present invention.

Description of reference numerals:

100. an image source; 110. a first chip; 120. a second chip; 130. a third chip; 200. a color combination module; 210. a film A; 220. a film B; 300. an imaging optical assembly; 310. a first lens; 320. a second lens; 330. a third lens; 340. a fourth lens; 350. a plate glass; 400. an optical path conduction module; 410. a geometric array optical waveguide; 420. the prism sheet is incident.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1 and 2, in an embodiment of the present invention, a near-eye display device is provided, which includes an image source 100, a color combination module 200, an imaging optical assembly 300, and an optical path transmission module 400 sequentially disposed along an optical path.

The image source 100 is used to provide three-way monochromatic image light. Specifically, the image source 100 includes a first chip 110 for emitting red light, a second chip 120 for emitting green light, and a third chip 130 for emitting blue light.

The color combination module 200 is used for receiving all the monochromatic image lights and combining them into a path of color image light. Specifically, the color combining module 200 may be an X color combining prism, an X color combining plate, or another color combining device capable of implementing the above functions in the prior art, which is not limited herein.

The imaging optical assembly 300 includes a first lens 310, a second lens 320, a third lens 330, and a fourth lens 340, which are sequentially disposed along a light output direction. In particular, the four lenses are coaxial.

The first lens 310 has positive focal power, the first lens 310 is a plano-convex lens or a convex-concave lens, a plane or a concave surface of the first lens is close to the color combination module, and a convex surface of the first lens is close to the image side; the second lens 320 has positive optical power, and the second lens 320 is a convex-concave lens with a convex surface close to the first lens 310 and a concave surface close to the image side; the third lens 330 has negative focal power, and the third lens 330 is a biconcave lens; the fourth lens 340 has positive focal power, the fourth lens 340 is a plano-convex lens or a convex-concave lens, the plane or concave surface of the fourth lens is close to the third lens 330, and the convex surface of the fourth lens is close to the image side;

the light path conducting module 400 is used for receiving and conducting the light output by the imaging optical assembly 300 and emitting the light.

The embodiment of the utility model provides a near-to-eye display device's theory of operation as follows:

the image source 100 emits three paths of monochromatic image light, then the three paths of monochromatic image light are combined into one path of color image light through the color combining module 200, then the full-color light with image information enters the imaging optical assembly 300, and sequentially enters the four lenses to realize imaging, and then the formed image is transmitted and output to human eyes through the light path transmission module 400.

The embodiment of the utility model provides a near-to-eye display device, include image source 100, the color combination module 200, the imaging optics subassembly 300 and the light path conduction module 400 that set gradually along the light path, wherein the imaging optics subassembly 300 includes first lens 310, second lens 320, third lens 330 and fourth lens 340 that set gradually along the light output direction, and first lens 310 has positive focal power, and first lens 310 is plano-convex lens or convex-concave lens, and its plane or concave surface is close to the color combination module, and the convex surface is close to the image side; the second lens 320 has positive optical power, and the second lens 320 is a convex-concave lens with a convex surface close to the first lens 310 and a concave surface close to the image side; the third lens 330 has negative focal power, and the third lens 330 is a biconcave lens; the fourth lens 340 has positive optical power, and the fourth lens 340 is a plano-convex lens or a convex-concave lens, and has a plane or concave surface close to the third lens 330 and a convex surface close to the image side. Adopt this structure, make the embodiment of the utility model provides a near-to-eye display device, small, the convenience preferred, simple structure, light in weight easily makes, and aberration correction is better moreover, and the imaging quality is good.

In an alternative embodiment, as shown in fig. 2, the color combining module 200 includes four color combining prisms, which are four right-angle prisms, and are respectively formed by coating films on the side surfaces and thick-gluing the side surfaces to form a color combining X prism, wherein the film a210 reflects only red light and transmits green light and blue light, and the film B220 reflects only blue light and transmits red light and green light.

In an optional embodiment, the light emitting surface of the first lens is aspheric, the light incident surface of the second lens is aspheric, the light emitting surface of the third lens is spherical, the light incident surface is aspheric, and the light emitting surface and the light incident surface of the fourth lens are both aspheric.

In the embodiment, the four lenses all have aspheric surfaces, so that the appearance of each lens is relatively flat, the thickness of each lens is relatively thin, the degree of optical distortion generated in the peripheral optical zone of the lens is obviously lower than that of a spherical lens, deformation and halo phenomena are not easy to occur generally, and the imaging effect is good.

In an alternative embodiment, the material of the first lens, the second lens, the third lens and the fourth lens is optical glass or optical resin, respectively.

When the lens is made of optical resin, the lens has the advantages of excellent optical properties, difficult scratching, high refractive index and thin thickness, but has the defects of fragility and heavy material. When the above lens is made of an optical resin, the lens is lightweight and easy to process. The materials of the four lenses in this embodiment may be the same or different, and may be flexibly selected according to the use requirement, which is not limited herein.

In an alternative embodiment, as shown in fig. 2, the imaging optical assembly 300 further includes a flat glass 350, and the flat glass 350 is disposed on the light-emitting side of the fourth lens 340. The flat glass 350 is provided to protect lenses in the imaging optics assembly 300.

In an alternative embodiment, as shown in fig. 1, the optical path guiding module 400 includes a geometric array optical waveguide 410 and an incident prism sheet 420 connected to the light input end of the geometric array optical waveguide 410, and the incident prism sheet 420 is disposed in the light output direction of the imaging optical assembly 300. The incident prism sheet 420 is used to guide the light emitted from the imaging optical assembly 300 into the geometric array optical waveguide 410, and may be a triangular prism, a trapezoidal prism, or a prism with other shapes, as long as the above effects are achieved.

Specifically, the geometric array optical waveguide 410 has an array of "half-mirror" mirrors therein. After entering the geometric array optical waveguide 410 through one end of the geometric array optical waveguide 410, the light output by the imaging optical component 300 can be totally reflected for multiple times in the geometric array optical waveguide 410, reach the position of the semi-transparent and semi-reflective mirror array, and then exit through the mirror array.

The term "transflective" means that a part of light is transmitted and another part is reflected. Each mirror is a surface embedded in the glass substrate and forming a specific angle with the transmitted light, each mirror reflects a portion of the light out of the waveguide, and the remaining light transmission continues through the waveguide. This portion of the advancing light then encounters another "half-mirror," and the process repeats until the last mirror in the mirror array reflects all of the remaining light out of the waveguide.

The optical path transmission module 400 has a simple structure and is easy to install.

In an optional embodiment, the exit pupil distance of the imaging optical assembly is greater than or equal to 15mm, so that the whole field of view can be seen by the eyes of a user, the display image can be integrally presented on the eyes of the user, the display effect is ensured, and the user experience is improved.

Table 1 shows a set of actual design parameters, under which the entrance pupil aperture of the near-to-eye display device is 5.12mm, the effective focal length is 6.2mm, the F number is 1.25, the exit pupil distance is 15mm or more, the full diagonal field angle is 30 °, the total volume is within 1 cubic centimeter, and the miniaturization is more suitable for the wearable device.

TABLE 1

Note that, the surface numbers 1 to 8 in table 1 are surface numbers S1 to S8 shown in fig. 2, the surface numbers 9 and 10 are parts denoted by 200 and 120 in fig. 2, respectively, and the unit of the radius of curvature and the center thickness in table 1 are millimeters (mm). The image source itself has a certain thickness, and a typical image source has a thickness of about 0.5 and a refractive index of about 1.55, and is a typical value of a parameter of one image source. The central thickness of the beam combining module reaches 4mm, and a large enough space can be reserved for the installation of the illumination structure, so that a user can install the illumination device on the side of the beam combining module as required, and the display effect is improved.

Based on the actual design parameters of the near-eye display devices shown in fig. 1 and 2 and the near-eye display device shown in table 1, the imaging quality map of the near-eye display device in the full-field full-waveband in the system where the near-eye display device shown in fig. 3 to 5 is located can be obtained.

Fig. 3 is a schematic diagram illustrating an MTF (Modulation Transfer Function, short for Modulation Transfer Function) value of a near-eye display device according to an embodiment of the present invention, where as shown in the figure, the MTF of the near-eye display device is greater than or equal to 0.7 at a spatial frequency of 62.5 lp/mm.

Fig. 4 is a field curvature and distortion diagram of a full-field full-waveband of a near-eye display device according to an embodiment of the present invention, where diagram (a) is a field curvature diagram and diagram (b) is a distortion diagram, as shown in the figure, the field curvature of the near-eye display device is controlled within <30 μm, and the optical distortion is controlled at 0.7 or less.

Fig. 5 is a dot array diagram of a full field of view of a near-eye display device according to an embodiment of the present invention, as shown in the figure, the radius of RMS (Root Mean Square) is controlled to be less than 3.116 μm, which is less than 4 μm of pixels, so that an imaging effect with ultra-high image quality can be achieved.

In the above embodiments, the image source includes a first chip for emitting red light, a second chip for emitting green light, and a third chip for emitting blue light, and the first chip, the second chip, and the third chip are all Micro-LED chips.

The three chips adopt Micro-LED chips, so that an illumination light path is not needed in an image source and the image source has ultrahigh brightness (the brightness can be tens of thousands of nits). The size of the Micro-LED chip is between several micrometers and dozens of micrometers, the Micro-LED chip has the advantages of self-luminescence, high efficiency, long service life and the like, so that the image source has the advantages of high brightness, high efficiency, high reliability and the like, the Micro-LED chip is an ideal display unit of intelligent wearable equipment, and the two problems of improving the brightness and reducing the weight can be solved at the same time.

The utility model discloses a further embodiment provides a wearing equipment, and this wearing equipment can specifically can be selected according to the use needs is nimble for AR intelligence glasses, intelligent head hoop, intelligent face guard etc.. The wearing equipment that this embodiment provided, including the near-to-eye display device that each above-mentioned embodiment provided for whole wearing equipment is small, the convenience preferred, simple structure, light in weight, easily manufacturing, and aberration correction is better moreover, and imaging quality is good.

The foregoing is only a preferred embodiment of the present invention, and the technical principles of the present invention have been specifically described, and the description is only for the purpose of explaining the principles of the present invention, and should not be construed as limiting the scope of the present invention in any way. Any modifications, equivalents and improvements made within the spirit and principles of the invention and other embodiments of the invention without the creative effort of those skilled in the art are intended to be included within the protection scope of the invention.

Claims

1. A near-to-eye display device is characterized by comprising an image source, a color combination module, an imaging optical component and an optical path conduction module which are sequentially arranged along an optical path;

2. The near-to-eye display device of claim 1, wherein the light-emitting surface of the first lens is aspheric, the light-incident surface of the second lens is aspheric, the light-emitting surface of the third lens is spherical and the light-incident surface is aspheric, and the light-emitting surface and the light-incident surface of the fourth lens are both aspheric.

3. The near-eye display device according to claim 2, wherein a material of the first lens, the second lens, the third lens, and the fourth lens is optical glass or optical resin, respectively.

4. The near-to-eye display device of claim 1, wherein the imaging optics assembly further comprises a flat glass disposed on a light exit side of the fourth lens.

5. The near-eye display device of claim 1, wherein the optical path conducting module comprises a geometric array optical waveguide and an incident prism sheet connected to a light input end of the geometric array optical waveguide, and the incident prism sheet is disposed in a light output direction of the imaging optical assembly.

6. The near-eye display device of any one of claims 1-5 wherein the imaging optics assembly has an exit pupil distance of 15mm or greater.

7. The near-to-eye display device of claim 6 wherein the imaging optics assembly has an effective focal length of 6.2mm, a diagonal full field angle of 30 °, and an F-number of 1.25.

8. The near-eye display device of any one of claims 1-5 wherein the diagonal full field angle of the imaging optics assembly is 20 ° -40 °.

9. The near-eye display device of any one of claims 1-5, wherein the image source comprises a first chip for emitting red light, a second chip for emitting green light, and a third chip for emitting blue light, the first chip, the second chip, and the third chip being Micro-LED chips.

10. A wearable device comprising the near-eye display device of any of claims 1-9.