CN219778040U - Near-to-eye display device capable of eliminating stray light - Google Patents

Abstract

The utility model discloses a near-eye display device capable of eliminating stray light, which comprises: displaying an image source; an imaging lens unit having positive optical power and transmitting the received light to a light modulation unit; the light shielding plate is positioned between the imaging lens unit and the curved mirror and protrudes out of the imaging lens unit to extend to the side where the light modulation unit is positioned; the light modulation unit comprises a flat lens and a film layer, the flat lens is inclined relative to the optical axis of the imaging lens unit, and the film layer is attached to one side of the flat lens, which is close to the curved mirror; the curved mirror is concave at one side close to the light modulation unit and is provided with a transflective film, and the optical axis is perpendicular to the optical axis of the imaging lens unit; the effective imaging light reflected by the curved mirror can enter the light modulation unit without passing through the light shielding plate and then be transmitted to human eyes. The device can effectively eliminate the light spot outside the picture, and in the diopter adjusting process, redundant shielding can not occur to influence the optical performance, and the angle of view remains unchanged, so that the user experience sense and the immersion sense are improved.

Description

Near-to-eye display device capable of eliminating stray light

Technical Field

The utility model belongs to the technical field of optical display, and particularly relates to a near-to-eye display device capable of eliminating stray light.

Background

In recent years, with the development of technologies such as artificial intelligence and algorithms, virtual reality/enhanced display near-eye display devices have been expanding, and at present, near-eye display devices have been widely used in fields such as games, medical treatment, industry, education and entertainment. The near-eye display device is to enlarge and superimpose the image projection displayed by the image source on the real world, and image the image on the real vision of human eyes, so that the virtual image and the real world are fused; the optical module is used as a core device in the near-eye display device, and is more important for design research and innovation.

The existing near-eye display device has serious stray light outside a picture due to the design, and has the most obvious expression that a reflection facula appears outside an effective picture, for example, in the diopter adjustment process, as diopter increases, an imaging lens moves downwards, so that a convex part of the imaging lens exists between a flat lens and a curved mirror, and in the light path propagation process, a part of light rays are transmitted to the convex position of the imaging lens to illuminate the convex position, and finally, a huge facula is formed outside the effective picture. Such stray light greatly reduces the user's experience and immersion in using the near-eye display device.

Disclosure of Invention

The utility model aims to solve the problems, and provides a near-to-eye display device capable of eliminating stray light, which can effectively eliminate light spots outside a picture, can not cause redundant shielding to influence optical performance in the diopter adjustment process, can keep the angle of view unchanged under different diopters, has better imaging effect, and improves the experience and immersion feeling of a user.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a near-to-eye display device capable of eliminating stray light, which comprises a display image source, an imaging lens unit, a light shielding plate, a light modulation unit and a curved mirror, wherein:

a display image source for providing light to the imaging lens unit;

an imaging lens unit having positive optical power and transmitting the received light to a light modulation unit;

the light shielding plate is positioned between the imaging lens unit and the curved mirror and protrudes out of the imaging lens unit to extend to the side where the light modulation unit is positioned;

the light modulation unit comprises a flat lens and a film layer for modulating light, the flat lens is obliquely arranged relative to the optical axis of the imaging lens unit, and the film layer is attached to one side, close to the curved mirror, of the flat lens;

the curved mirror is concave at one side close to the light modulation unit and is provided with a transparent reflecting film, and the optical axis of the curved mirror is perpendicular to the optical axis of the imaging lens unit;

the effective imaging light reflected by the curved mirror can enter the light modulation unit without passing through the light shielding plate and then be transmitted to human eyes.

Preferably, the near-to-eye display device capable of eliminating stray light further comprises an adjusting mechanism, the adjusting mechanism comprises a mounting frame, a moving plate and an adjusting screw, a screw hole is formed in the moving plate, the mounting frame, the light modulating unit and the curved mirror are connected to the mounting frame, the display image source and the imaging lens unit are connected with the moving plate, the light shielding plate is attached to the imaging lens unit, the adjusting screw can penetrate through the mounting frame and is in threaded connection with the screw hole, the moving plate can be driven to move through rotating the adjusting screw, and accordingly the display image source, the imaging lens unit and the light shielding plate are driven to be synchronously close to or far away from the light modulating unit.

Preferably, the connection mode of the light shielding plate and the imaging lens unit is back adhesive bonding or dispensing connection or welding.

Preferably, the adjusting mechanism further comprises a guiding mechanism for limiting the rotation of the moving plate.

Preferably, the focal length of the imaging lens unit is 12mm to 17.5mm.

Preferably, the distance between the side of the light shielding plate, which is close to the light modulating unit, and the light emitting surface of the imaging lens unit is 1.5mm to 3mm.

Preferably, the light shielding plate is one of a metal plate, a plastic plate, a Mylar and a polaroid.

Preferably, the film layer includes at least one of a polarizing film, a quarter wave plate, and a PBS film.

Preferably, the light emitting surface of the imaging lens unit is a convex surface, and one side of the light shielding plate, which is close to the light modulating unit, is matched with the shape of the light emitting surface of the imaging lens unit.

Preferably, the display image source is one of an OLED display, an LCOS display, a micro display, an LBS display and a DLP display.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the light reflected to the light emitting surface of the imaging lens unit by the curved mirror can be absorbed by the light shielding plate arranged between the imaging lens unit and the curved mirror, other effective light can be modulated again by the light modulating unit after being reflected by the curved mirror, then the effective light can reach the human eye for imaging by the light modulating unit, the effective light path can be ensured to normally image outside the human eye, the light spots outside the picture are effectively eliminated by the light shielding plate, and especially, the problem that the stray light spots outside the picture are serious in the diopter adjusting process as the diopter becomes larger is solved, and the redundant shielding can not occur by adapting to the shape of the light emitting surface of the imaging lens unit, so that only the light outside the shielded imaging picture is absorbed, the normal imaging picture is not interfered, the imaging effect is better, and the light shielding plate is more attractive in perspective; the diopter adjustment is realized through the adjusting mechanism, the display image source, the imaging lens unit and the light shielding plate synchronously move relative to the light modulating unit during adjustment, the optical performance of the device under various diopters can not be influenced while the field angle FOV is unchanged under different diopters, the diopter adjustment of 0D-7D can be realized, and the device is used for covering highly myopic people; and through the focal length of reasonable setting imaging lens unit, help guaranteeing the imaging quality when realizing diopter regulation for the people's eye receives more clear sharp picture, in order to adapt to people's eye angular resolution, improves user's experience sense and immersion sense.

Drawings

FIG. 1 is a schematic diagram of a near-to-eye display device capable of eliminating stray light according to the present utility model;

FIG. 2 is a schematic diagram showing the assembly of an image source, an imaging lens unit and a mask according to the present utility model;

FIG. 3 is a graph comparing imaging results of the prior art and the present utility model.

Reference numerals illustrate: 1. displaying an image source; 2. an imaging lens unit; 3. a light shielding plate; 4. a light modulation unit; 5. a curved mirror; 6. an adjusting mechanism; 61. a mounting frame; 62. a moving plate; 63. adjusting a screw; 64. screw holes.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

As shown in fig. 1 to 3, a near-eye display device capable of eliminating stray light includes a display image source 1, an imaging lens unit 2, a light shielding plate 3, a light modulation unit 4, and a curved mirror 5, wherein:

a display image source 1 for supplying light to the imaging lens unit 2;

an imaging lens unit 2 having positive optical power and configured to transmit the received light to a light modulation unit 4;

a light shielding plate 3, which is located between the imaging lens unit 2 and the curved mirror 5 and protrudes from the imaging lens unit 2 to extend to the side where the light modulation unit 4 is located;

the light modulation unit 4 comprises a flat lens and a film layer for modulating light, wherein the flat lens is obliquely arranged relative to the optical axis of the imaging lens unit 2, and the film layer is attached to one side, close to the curved mirror 5, of the flat lens;

a curved mirror 5, which is concave on one side close to the light modulation unit 4 and is provided with a transflective film, and the optical axis of the curved mirror 5 is perpendicular to the optical axis of the imaging lens unit 2;

the effective imaging light reflected by the curved mirror 5 can be transmitted to human eyes without entering the light modulating unit 4 through the light shielding plate 3.

The image source 1 is used for providing an image, the imaging lens unit 2 is used as a device with the most focal power in the whole device, is a core device for distributing refractive angles of optical focal power in the whole system, mainly plays an aberration correcting role in the optical path system, and can be composed of a series of lenses with an aberration correcting function, each lens can be made of plastic materials or glass materials, and the number of the lenses of the imaging lens unit 2 is not limited, including but not limited to the following types: spherical lenses, aspherical lenses, free-form surface lenses, fresnel lenses, flat lenses, and the like, and aspherical lenses are preferable.

The light shielding plate 3 is positioned between the imaging lens unit 2 and the curved mirror 5, can absorb non-imaging light, effectively blocks stray light spots outside a picture, and has better imaging effect.

The light modulation unit 4 comprises a flat lens and a film layer with a light modulation function, wherein the flat lens can be made of plastic or glass, and the film layer can be attached to the flat lens or plated on the flat lens; the film layer plays a role of light polarization modulation, and the light modulation unit 4 is obliquely arranged relative to the optical axis of the imaging lens unit 2, for example, the included angle is 37-51 degrees, preferably 45 degrees.

The curved mirror 5 is a lens with aberration correction and optical path reflection functions, and may be made of glass or plastic materials, including but not limited to the following types: the curved mirror 5 is preferably a spherical lens, and the transflective film provided on the curved mirror 5 may be realized in a film plating manner or a film sticking manner. Since the light shielding plate 3 mainly serves to shield the non-imaging stray light reflected by the curved mirror 5, it is required that the light shielding plate 3 should be designed so as to shield only the stray light not used for imaging and not shield the optical path of the effective imaging light.

It is easy to understand that the surface types of the mirrors can be freely selected and freely combined according to the spherical surface, the aspherical surface and the free curved surface, the surface types of the mirrors are not required to be consistent, each mirror surface can be selected from the surface types, and the surface types of the final lenses can be the same surface type or different surface types.

In an embodiment, the near-to-eye display device capable of eliminating stray light further comprises an adjusting mechanism 6, the adjusting mechanism 6 comprises a mounting frame 61, a moving plate 62 and an adjusting screw 63, a screw hole 64 is formed in the moving plate 62, the mounting frame 61, the light modulating unit 4 and the curved mirror 5 are connected to the mounting frame, the display image source 1 and the imaging lens unit 2 are connected with the moving plate 62, the light shielding plate 3 is attached to the imaging lens unit 2, the adjusting screw 63 can penetrate through the mounting frame 61 and be in threaded connection with the screw hole 64, the moving plate 62 can be driven to move by rotating the adjusting screw 63, and accordingly the display image source 1, the imaging lens unit 2 and the light shielding plate 3 are driven to synchronously approach or separate from the light modulating unit 4.

Wherein, should be provided with the aperture slightly and be greater than the through-hole of adjusting screw 63 external screw thread diameter on the mounting bracket 61, make things convenient for adjusting screw 63 to wear to locate interior rotation, ensure adjusting screw 63's installation and rotation precision simultaneously. Through carrying out synchronous movement as whole with showing image source 1 and imaging lens unit 2, guarantee that its relative position is unchangeable and realize diopter regulation, can effectively guarantee the uniformity of the light angle of tracking, thereby guarantee that the size of angle of vision is unchangeable, experience sense and the comfort level of wearing are improved, and light screen 3 is attached on imaging lens unit 2, promptly along with showing image source 1 and imaging lens unit 2 synchronous movement, can shelter from the parasitic light part that non-imaging was used alone in the adjustment process can not shelter from effective imaging light, thereby can not influence the optical imaging performance of the device under various diopters.

In an embodiment, the light shielding plate 3 and the imaging lens unit 2 are connected by adhesive-backed bonding or adhesive-dispensing connection or welding.

In one embodiment, the adjustment mechanism 6 further includes a guide mechanism for rotationally limiting the moving plate 62.

In one embodiment, the focal length of the imaging lens unit 2 is 12mm to 17.5mm. Specifically, the air interval between the display image source 1 and the imaging lens unit 2 is 0.5 mm-2 mm, the thickness of the imaging lens unit 2 is 1.5 mm-12 mm, the space interval between the center of the flat lens and the imaging lens unit 2 is 5.5 mm-11 mm, and the thickness of the flat lens is 0.3 mm-1 mm. By reasonably setting the focal length and the air interval and thickness between the structures, the diopter adjustment is realized, the imaging quality is guaranteed, the human eyes are guaranteed to receive clearer and sharper pictures, and the method is suitable for human eye angular resolution.

In one embodiment, the distance between the side of the light shielding plate 3 near the light modulating unit 4 and the light emitting surface of the imaging lens unit 2 is 1.5mm to 3mm. The light shielding plate 3 has a good light shielding effect in the preferred range, and by being matched with the shape of the light emitting surface of the imaging lens unit 2, redundant shielding can not occur, so that a better imaging effect is achieved. The specific distance range can be adjusted according to actual requirements, and in the size, the shielding effect is good, if the distance is too small, the projection of the shielding plate 3 cannot completely cover the projection of the imaging lens unit 2 along the direction of non-imaging stray light, namely, the non-imaging light rays still irradiate on the imaging lens unit 2 to form light spots; if the distance is too large, not only is the material of the light shielding plate 3 wasted, but also effective imaging light rays, namely the light rays actually entering human eyes for imaging, are likely to be shielded, so that imaging pictures entering human eyes are lost, and the picture appearance is influenced.

In one embodiment, the light shielding plate 3 is one of a metal plate, a plastic plate, a mylar sheet, and a polarizer. Or may be replaced with other prior art structures having light absorption to reduce or even eliminate reflectivity.

In one embodiment, the film layer comprises at least one of a polarizing film, a quarter wave plate, and a PBS film. The film layer can be one or more of a polarizing film, a quarter wave plate, a PBS (Polarization Beam Splitter) film and a polarization splitting prism film, and can be adjusted according to actual requirements by a person skilled in the art during use, or can also adopt other structures with light modulation function in the prior art.

In an embodiment, the light emitting surface of the imaging lens unit 2 is a convex surface, and one side of the light shielding plate 3 close to the light modulating unit 4 is in shape matching with the light emitting surface of the imaging lens unit 2.

That is, the edge of the light shielding plate 3 near the light modulating unit 4 is also matched with the edge of the light emitting surface of the imaging lens unit 2, and especially, by being matched with the shape of the light emitting surface of the imaging lens unit 2 (that is, the same as or similar to the cross-sectional shape of the light emitting surface of the imaging lens unit 2), redundant shielding does not occur.

The imaging lens unit 2 is a device for bearing the distribution of main diopter in the design of the optical path, has positive focal power, and the light emitting surface is mostly convex in the practical design, and if the imaging lens unit 2 comprises a plurality of lenses, the light emitting surface of the imaging lens unit 2 refers to the light emitting surface of the lens closest to the light modulating unit 4.

In one embodiment, the display image source 1 is one of an OLED display, an LCOS display, a micro-led display, an LBS display, and a DLP display. Preferably an OLED display.

The near-eye display device comprises a display image source 1, an imaging lens unit 2, a light shielding plate 3, a light modulation unit 4, a curved mirror 5 and an adjusting mechanism 6. In operation, light emitted by the display image source 1 is transmitted to the light modulation unit 4 through the imaging lens unit 2, the light modulation unit 4 is provided with a film layer with a light path modulation function, when the light passes through the light modulation unit 4 for the first time, the light is modulated, effective light is reflected to the curved mirror 5 through screening, the curved mirror 5 has a transflective function, therefore, the light is reflected back to pass through the light modulation unit 4 again after passing through the curved mirror 5, and due to the fact that the light emergent surface of the imaging lens unit 2 protrudes downwards between the curved mirror 5 and the light modulation unit 4, a part of light reflected back by the curved mirror 5 is transmitted to the light emergent surface of the imaging lens unit 2, so that the area is illuminated to form a bright spot, and the bright spot is finally mapped to an area outside an imaging picture. Therefore, in order to effectively eliminate the flare, by disposing a structure capable of absorbing the light reflected by the curved mirror 5 to the light exit surface of the imaging lens unit 2, that is, the light shielding plate 3, between the imaging lens unit 2 and the curved mirror 5, the light shielding plate 3 only absorbs and shields the light outside the imaging screen, and no influence is exerted on the light inside the imaging screen, and the formation of a normal imaging screen is not interfered. Other effective light rays are reflected by the curved mirror 5 and pass through the light modulation unit 4 again, and when the effective light rays pass through again, the light rays are modulated again when the effective light rays pass through again because the light modulation unit 4 is provided with a film layer with a light path modulation function, and at the moment, the effective light rays can penetrate through the light modulation unit 4 and finally reach human eye imaging. Therefore, in the whole light path imaging system, the light spots outside the picture are effectively eliminated through the light shielding plate 3 while the effective light path is ensured to normally image and enter the outside of the human eye. And when diopter is adjusted, the display image source 1, the imaging lens unit 2 and the light shielding plate 3 synchronously move relative to the light modulation unit 4, and when the field angle FOV is kept unchanged under different diopters, the light shielding plate 3 only shields the stray light part and can not shield effective light, and especially, through the shape adaptation with the light emitting surface of the imaging lens unit 2, redundant shielding can not occur, the imaging effect is better, the optical performance of the device under various diopters can not be influenced, 0D-7D diopter adjustment can be realized, and the device is used for covering highly myopic crowds. As shown in fig. 3, the imaging result (fig. a) of the prior art without the light shielding plate and the imaging result (fig. b) of the technical scheme of the utility model are shown, and the result shows that the technical scheme of the utility model absorbs the light outside the shielding imaging picture, eliminates the light spots and does not interfere with the formation of the normal imaging picture.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above-described embodiments represent only the more specific and detailed embodiments of the present utility model, but are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A near-to-eye display device capable of eliminating stray light, characterized in that: the near-to-eye display device capable of eliminating stray light comprises a display image source (1), an imaging lens unit (2), a light shielding plate (3), a light modulation unit (4) and a curved mirror (5), wherein:

the display image source (1) is used for providing light rays for the imaging lens unit (2);

the imaging lens unit (2) has positive focal power and is used for transmitting received light rays to the light ray modulation unit (4);

the light shielding plate (3) is positioned between the imaging lens unit (2) and the curved mirror (5) and protrudes out of the imaging lens unit (2) to extend to the side where the light ray modulation unit (4) is positioned;

the light modulation unit (4) comprises a flat lens and a film layer for modulating light, the flat lens is obliquely arranged relative to the optical axis of the imaging lens unit (2), and the film layer is attached to one side, close to the curved mirror (5), of the flat lens;

the curved mirror (5) is concave at one side close to the light modulation unit (4) and is provided with a transflective film, and the optical axis of the curved mirror (5) is perpendicular to the optical axis of the imaging lens unit (2);

the effective imaging light reflected by the curved mirror (5) can be transmitted to human eyes without passing through the light shielding plate (3) and entering the light modulation unit (4).

2. The near-eye display device of claim 1, wherein stray light is eliminated: the near-to-eye display device capable of eliminating stray light further comprises an adjusting mechanism (6), the adjusting mechanism (6) comprises a mounting frame (61), a moving plate (62) and an adjusting screw (63), a screw hole (64) is formed in the moving plate (62), the mounting frame (61), the light modulating unit (4) and the curved mirror (5) are all connected to the mirror frame, the display image source (1) and the imaging lens unit (2) are all connected with the moving plate (62), the light shielding plate (3) is attached to the imaging lens unit (2), the adjusting screw (63) can penetrate through the mounting frame (61) and is in threaded connection with the screw hole (64), and the moving plate (62) can be driven to move through rotation of the adjusting screw (63), so that the display image source (1), the imaging lens unit (2) and the light shielding plate (3) are synchronously close to or far away from the light modulating unit (4).

3. The near-eye display device of claim 2, wherein stray light is eliminated: the connection mode of the light shielding plate (3) and the imaging lens unit (2) is back adhesive bonding or dispensing connection or welding.

4. A near-eye display device capable of eliminating stray light as claimed in claim 2 or 3, wherein: the adjusting mechanism (6) further comprises a guiding mechanism for limiting the rotation of the moving plate (62).

5. The near-eye display device of claim 1, wherein stray light is eliminated: the focal length of the imaging lens unit (2) is 12 mm-17.5 mm.

6. The near-eye display device of claim 1, wherein stray light is eliminated: the distance between one side of the light shielding plate (3) close to the light modulation unit (4) and the light emergent surface of the imaging lens unit (2) is 1.5-3 mm.

7. The near-eye display device of claim 1, wherein stray light is eliminated: the light shielding plate (3) is one of a metal plate, a plastic plate, a Mylar film and a polaroid film.

8. The near-eye display device of claim 1, wherein stray light is eliminated: the film layer comprises at least one of a polarizing film, a quarter wave plate and a PBS film.

9. The near-eye display device of claim 1, wherein stray light is eliminated: the light-emitting surface of the imaging lens unit (2) is a convex surface, and one side of the light shielding plate (3) close to the light modulation unit (4) is matched with the light-emitting surface of the imaging lens unit (2) in shape.

10. The near-eye display device of claim 1, wherein stray light is eliminated: the display image source (1) is one of an OLED display, an LCOS display, a micro display, an LBS display and a DLP display.