CN111929907B - Image display structure and head-mounted display device - Google Patents
Image display structure and head-mounted display device Download PDFInfo
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- CN111929907B CN111929907B CN202011020556.9A CN202011020556A CN111929907B CN 111929907 B CN111929907 B CN 111929907B CN 202011020556 A CN202011020556 A CN 202011020556A CN 111929907 B CN111929907 B CN 111929907B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
Abstract
The invention discloses an image display structure and a head-mounted display device, wherein the image display structure comprises: the display screen is used for emitting display light rays; the imaging lens is arranged in the emergent direction of the display light; the transparent plate is arranged in a light path between the display screen and the imaging lens, the transparent plate is provided with a first surface facing the display screen and a second surface back to the display screen, the imaging lens is provided with an inner surface facing the transparent plate and an outer surface back to the transparent plate, the first surface or the second surface of the transparent plate is provided with a light splitting film, and the outer surface of the imaging lens is provided with a polarization reflecting film; the first quarter-wave plate is arranged on one side of the polarization reflection film facing the transparent plate. The technical scheme of the invention can reduce the volume of the product and is convenient for the user to carry.
Description
Technical Field
The invention relates to the technical field of optical display, in particular to an image display structure and a head-mounted display device.
Background
With the development and upgrade of advanced optical design and processing technology, display technology and processors, the product form and variety of the head-mounted display device are infinite, and the application field thereof is also increasingly wide. The user can obtain an immersive sensory experience through the head-mounted display device. The main working principle of the head-mounted display device is that after an image displayed by the display is transmitted and amplified through the optical lens, the image can be received by human eyes, the human eyes observe an amplified virtual image, and the image needs to be transmitted in an amplified process in an enough space, so that the current head-mounted display device has the defects of large size and inconvenience in carrying.
Disclosure of Invention
Based on this, to the problem that current head mounted display device has the volume great, inconvenient carrying, it is necessary to provide an image display structure and head mounted display device, aims at reducing the product volume, and convenient to carry for the user.
To achieve the above object, the present invention provides an image display structure, including:
a display screen for emitting display light;
the imaging lens is arranged in the emergent direction of the display light;
a transparent plate disposed in an optical path between the display screen and the imaging lens;
the transparent plate is provided with a first surface facing the display screen and a second surface facing away from the display screen, the imaging lens is provided with an inner surface facing the transparent plate and an outer surface facing away from the transparent plate, the first surface or the second surface of the transparent plate is provided with a light splitting film, and the inner surface of the imaging lens is provided with a polarization reflection film; and
the first quarter-wave plate is arranged on one side, facing the transparent plate, of the polarization reflection film, and defines that the central distance between the inner surface of the imaging lens and the second surface of the transparent plate is L1, and the central distance between the first surface of the transparent plate and the light-emitting surface of the display screen is L2, so that 2mm < L1<8mm, and 15mm < L2<20 mm.
Optionally, the light splitting film is disposed on the second surface of the transparent plate, the first quarter-wave plate is disposed on the outer surface of the imaging lens, and the polarization reflection film is disposed on a side of the first quarter-wave plate facing away from the imaging lens.
Optionally, the image display structure further includes an antireflection film disposed on the first surface of the transparent plate.
Optionally, the image display structure further includes a polarizer disposed on a side of the polarization reflection film opposite to the transparent plate.
Optionally, the imaging lens is a meniscus lens, and a convex surface of the imaging lens faces away from the display screen, and the central thickness of the imaging lens is defined as T1, then 5mm < T1<10 mm.
Optionally, an absolute value of a radius of curvature of an outer surface of the imaging lens is greater than 75 and less than 80, and a conic coefficient of the outer surface is less than 6.
Optionally, the optical distortion of the image display structure is less than 22.6%, the imaging chromatic aberration of the image display structure is less than 97um, and the virtual image distance of the image display structure is 1500 mm.
Optionally, the imaging lens is a plano-convex lens, and a convex surface of the imaging lens faces away from the display screen, and the central thickness of the imaging lens is defined as T1, then 5mm < T1<10 mm.
Optionally, an absolute value of a radius of curvature of an outer surface of the imaging lens is greater than 90 and less than 100, and a conic coefficient of the outer surface is less than 10.
Optionally, the optical distortion of the image display structure is less than 22.2%, the imaging chromatic aberration of the image display structure is less than 167um, and the virtual image distance of the image display structure is 1500 mm.
Optionally, the image display structure further includes a second quarter-wave plate, and the second quarter-wave plate is disposed on the light exit surface of the display screen.
Furthermore, in order to solve the above problem, the present invention also provides a head-mounted display device including a housing and the image display structure as described above, the image display structure being provided to the housing.
According to the technical scheme, the display light emitted by the display screen is emitted to the transparent plate, when the display light is transmitted through the light splitting film, one part of the display light is reflected, and the other part of the display light is transmitted. The display light transmitted through the light splitting film passes through the transparent plate. The display light rays irradiate towards the first quarter-wave plate, the polarization state of the display light rays is converted from circular polarization into linear polarization, the display light rays in the linear polarization state irradiate towards the polarization reflection film, at the moment, the polarization transmission direction of the polarization reflection film is different from the polarization direction of the display light rays in the linear polarization state, and the display light rays cannot penetrate through the polarization reflection film and are reflected back to the first quarter-wave plate by the polarization reflection film. After the display light passes through the first quarter-wave plate, the linear polarization state is converted into the circular polarization state again, and the display light is emitted to the light splitting film. The display light is reflected and transmitted on the surface of the light splitting film again, one part of the display light is reflected to the first quarter-wave plate again to generate the display light in the linear polarization state again, the polarization angle of the display light in the linear polarization state is rotated after the two reflections, at the moment, the polarization direction of the display light is the same as that of the polarization reflection film, and the display light passes through the polarization reflection film and is amplified and imaged at the positions of human eyes of a user. Therefore, the display light is refracted and reflected between the light splitting film and the polarization reflecting film, so that under the condition of ensuring small volume, amplification transfer imaging of the display image is completed, the product volume is reduced, and the portable display device is convenient for a user to carry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of an image display structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the imaging lens of FIG. 1;
FIG. 3 is an enlarged schematic view of portion A of FIG. 2;
FIG. 4 is a schematic view of the transparent plate of FIG. 1;
FIG. 5 is an enlarged schematic view of portion B of FIG. 4;
FIG. 6 is a schematic structural diagram of another embodiment of an image display structure according to the present invention;
FIG. 7 is a dot-sequence diagram of the image display structure of FIG. 1;
FIG. 8 is a graph of field curvature and distortion of the image display structure of FIG. 1;
FIG. 9 is a vertical axis color difference plot of the image display structure of FIG. 1;
FIG. 10 is a dot-sequence diagram of the image display structure of FIG. 6;
FIG. 11 is a graph of field curvature and distortion of the image display structure of FIG. 6;
FIG. 12 is a vertical axis color difference plot of the image display structure of FIG. 6;
FIG. 13 is a partial data parameter diagram of the image display structure of FIG. 1;
FIG. 14 is a data parameter diagram of another portion of the image display structure of FIG. 1;
FIG. 15 is a partial data parameter diagram of the image display structure of FIG. 6;
FIG. 16 is another data parameter diagram of the image display structure of FIG. 6.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
320 | |
| 110 | |
40 | |
| 120 | |
50 | Polarizing |
| 20 | |
60 | The first quarter- |
| 210 | |
70 | Polaroid |
| 220 | |
80 | |
| 30 | |
90 | |
| 310 | First surface |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The display principle of the head-mounted display device also includes various display principles, for example, VR (Virtual Reality) display and AR (Augmented Reality) display, the displayed image of these head-mounted display devices needs to be transferred and amplified through optical lenses, and in the process of amplifying the image, enough space is needed for transferring light, so that the current head-mounted display devices are bulky and inconvenient to carry.
In order to solve the above problems, referring to fig. 1, 3 and 5, the present invention provides an image display structure including: a display screen 10, an imaging lens 20, a transparent plate 30 and a first quarter wave plate 60. The display screen 10 is used for emitting display light 110, and the transparent plate 30, the imaging lens 20 and the first quarter-wave plate 60 are sequentially arranged along the propagation direction of the display light 110, and the display light 110 is circularly polarized light or elliptically polarized light.
The imaging lens 20 is arranged in the emergent direction of the display light 110; the material of the imaging lens 20 may be glass, which has better optical refraction and reflection characteristics. The imaging lens 20 may also be made of plastic, so that the imaging lens 20 can be injection molded and is convenient to process.
The transparent plate 30 is arranged in the light path between the display screen 10 and the imaging lens 20, the transparent plate 30 has a first surface 310 facing the display screen 10 and a second surface 320 facing away from the display screen 10, the imaging lens 20 has an inner surface 210 facing the transparent plate 30 and an outer surface 220 facing away from the transparent plate 30, the first surface 310 or the second surface 320 of the transparent plate 30 is provided with the light splitting film 80, and the outer surface 220 of the imaging lens 20 is provided with the polarization reflection film 50; the display light 110 transmits through the transparent plate 30, the transparent plate 30 may be made of plastic, and the transparent plate 30 made of plastic is convenient to process, even though the plastic is integrally molded by injection molding. The light splitting film 80 and the polarization reflection film 50 may be provided by being attached or by being coated. The mode operation of pasting is simple more convenient, and the mode of coating film can make the rete more firm. The spectroscopic film 80 allows a part of the light directed to the surface thereof to be transmitted therethrough and the other part to be reflected. The polarization reflective film 50 has a polarization transmission direction, and the display light 110 emitted to the polarization reflective film 50 can be ensured to pass through smoothly only when the polarization direction is the same as the polarization transmission direction, and the display light 110 is reflected by the polarization reflective film 50 when the polarization direction of the display light 110 is different from the transmission direction of the polarization reflective film 50. For example, the polarization direction of the display light 110 is perpendicular to the transmission direction of the polarizing reflective film 50, and at this time, the display light 110 is reflected by the polarizing reflective film 50. The light splitting film 80 may be a transflective film having a transmittance of 30% or more.
The first quarter-wave plate 60 is provided on a side of the polarization reflection film 50 facing the transparent plate 30. The first quarter-wave plate 60 may be a separate optical component or may be a layer of optical film. The first quarter wave plate 60 may be attached to the surface of the imaging lens 20 or the transparent plate 30. The first quarter-wave plate 60 is used to change the polarization state of the display light 110, so that the display light 110 is switched between linear polarization and circular polarization.
Further, in order to ensure that the human eye 40 can obtain a clear image, the center distance between the inner surface of the imaging lens 20 and the second surface of the transparent plate 30 is L1, and the center distance between the first surface of the transparent plate 30 and the light-emitting surface of the display screen 10 is L2, then 2mm < L1<8mm, 15mm < L2<20 mm. The distance among the imaging lens 20, the transparent plate 30 and the display screen 10 can be adjusted in a movable manner within the above-defined range, so that the imaging lens 30 can effectively form clear images.
In the technical solution provided in this embodiment, the display light 110 emitted from the display screen 10 is emitted to the transparent plate 30, and when the display light 110 is transmitted through the light splitting film 80, a part of the display light 110 is reflected and a part of the display light 110 is transmitted. The display light 110 transmitted through the light splitting film 80 passes through the transparent plate 30. The display light 110 is emitted to the first quarter-wave plate 60, the polarization state of the display light 110 is converted from circular polarization to linear polarization, the display light 110 in the linear polarization state is emitted to the polarization reflective film 50, at this time, the polarization transmission direction of the polarization reflective film 50 is different from the polarization direction of the display light 110 in the linear polarization state, and the display light 110 cannot pass through the polarization reflective film 50 and is reflected by the polarization reflective film 50 back to the first quarter-wave plate 60. After the display light 110 passes through the first quarter-wave plate 60, the linear polarization state is converted into the circular polarization state again, and the light is emitted to the light splitting film 80. The display light 110 is reflected and transmitted again on the surface of the light splitting film 80, a part of the display light 110 is reflected again to the first quarter-wave plate 60, the display light 110 in the linear polarization state is generated again, after two reflections, the polarization angle of the display light 110 in the linear polarization state is rotated, at this time, the polarization direction of the display light 110 is the same as that of the polarization reflection film 50, and the display light 110 passes through the polarization reflection film 50 and is magnified and imaged at the position of the human eyes 40 of the user. Therefore, the display light 110 is refracted and reflected between the light splitting film 80 and the polarization reflection film 50, so that under the condition of ensuring small volume, the amplified transmission imaging of the display image is completed, the product volume is reduced, and the carrying by a user is facilitated.
In the above embodiment, reference is made to fig. 4 and 5. The light splitting film 80 is disposed on the second surface 320 of the transparent plate 30, the first quarter-wave plate 60 is disposed on the outer surface 220 of the imaging lens 20, and the polarization reflection film 50 is disposed on a side of the first quarter-wave plate 60 facing away from the imaging lens 20. At this time, the polarization reflective film 50, the first quarter-wave plate 60 and the light splitting film 80 are all optical film layers, and the three film layers may be disposed on corresponding surfaces in a pasting manner or a film coating manner. Therefore, the size of the whole image display structure can be further reduced, and the image display device is convenient for a user to carry.
In the above embodiment, the image display structure further includes an anti-reflection film 90, and the anti-reflection film 90 is disposed on the first surface 310 of the transparent plate 30. The anti-reflection film 90 functions to improve the transmittance of the display light 110, a part of the display light 110 is lost when the display light 110 propagates, and a part of the display light 110 is lost on the surface of the transparent plate 30 when the display light 110 passes through the transparent plate 30. Therefore, the antireflection film 90 is disposed on the first surface 310 of the transparent plate 30, and the antireflection film 90 can improve the transmittance of the display light 110, so as to ensure that the human eye 40 can obtain a display picture with sufficiently high brightness.
In the above embodiments, referring to fig. 2 and 3, the image display structure further includes the polarizer 70, and the polarizer 70 is disposed on the side of the polarized reflective film 50 opposite to the transparent plate 30. The polarizer 70 is also called a polarizer, and the function of the polarizer 70 eliminates stray light, thereby ensuring clearer imaging of the display light 110. In addition, the polarizer 70 may be an independent optical element or an optical film, so that the polarizer 70 is attached conveniently.
The display chip area of the display screen 10 emitting the display light 110 is small, and in order to effectively expand the imaging effect, as shown in fig. 6, the imaging lens 20 is a meniscus lens, and the convex surface of the imaging lens 20 faces away from the display screen 10. Therefore, after the display light 110 is emitted to the imaging lens 20, the display light 110 is refracted at the inner surface 210 of the imaging lens 20, so that the light spot formed by the display light 110 becomes larger, and is refracted and reflected among the light splitting films 80 for a plurality of times, so that the light spot of the display light 110 further becomes larger as the display light 110 passes through the imaging lens 20 for a plurality of times. In addition, the concave surface of the imaging lens 20 faces the display screen 10, that is, the surface which the display light 110 first contacts with the imaging lens 20 is the concave surface, so that the display light 110 can be refracted when contacting with the imaging lens 20, thereby further reducing the volume of the whole image display structure. In addition, in order to ensure that the display light 110 is imaged clearly, the central thickness of the imaging lens 20 is defined as T1, the central distance between the inner surface 210 of the imaging lens 20 and the second surface 320 of the transparent plate 30 is defined as L1, and the central distance between the first surface 310 of the transparent plate 30 and the light emitting surface 120 of the display screen 10 is defined as L2, then, 5mm < T1<10mm, 4mm < L1<8mm, and 15mm < L2<20 mm. The distances among the imaging lens 20, the transparent plate 30 and the display screen 10 can be flexibly adjusted within the above-defined range, so that a clear display picture can be formed.
To further improve the sharpness of the display light 110, the absolute value of the radius of curvature of the outer surface 220 of the imaging lens 20 is greater than 75 and less than 80, and the conic coefficient of the outer surface 220 is less than 6. In the present embodiment, the optical focal length f of the image display structure is 28.3mm, the focal length f1 of the imaging lens 2030 is 258.2mm, and the total system length of the whole of the image display structure is 41 mm. In addition, in the embodiment, clear imaging within a visible light range of 450nm to 630nm can be realized, in the display screen 1010, the display chip is 2.1 inches, a visible range of an angle of 80 degrees can be realized, distortion is less than 22.6%, chromatic aberration is less than 97um, and a virtual image distance is 1500 mm. Specific parameters of this embodiment are shown in fig. 13 and 14. Fig. 13 and 14 respectively show the optical surface numbers sequentially numbered from the human eye 40 to the display screen 10, the curvature (C) of each optical surface on the optical axis, and the distance (T) between each surface and the subsequent optical surface on the optical axis from the human eye 40 to the display screen 10. And even aspheric coefficients a2, a3, a4, wherein the aspheric coefficients may satisfy the following equation:
where z is a coordinate in the optical axis direction, Y is a radial coordinate in units of lens length, C is a curvature (1/R), k is a conic coefficient (Coin Constant), aiIs the coefficient of each high-order term, and 2i is the high power of the aspheric surface. In the embodiment, the field curvature is considered to be gentle, and the spherical coefficient is 4 th order without high-order terms.
In this embodiment, the design may also be performed by using an odd aspheric equation, and the general formula of the odd aspheric equation is as follows:
referring to fig. 7, in the present embodiment, a dot diagram is a dot diagram, in which after light emitted from a point passes through an image display structure, intersection points of the light and an image plane are no longer concentrated on the same point due to aberration, and a diffusion pattern scattered in a certain range is formed for evaluating the imaging quality of the image display structure. The smaller the root mean square radius value and the geometric radius value, the better the imaging quality. The arrangement sequence of the regions 1-3 is from left to right and from top to bottom. Therefore, the maximum root mean square radius value corresponding to the maximum field of view is less than 88 um.
Referring to fig. 8, the field curvature and distortion diagram in the present embodiment is an image field curvature, which is mainly used to indicate the misalignment between the intersection point of the entire display light 110 and the ideal image point in the image display structure. The distortion refers to the aberration with different magnifications of different parts of an object when the object is imaged through an image display structure, and the distortion can cause the similarity of the object image to be deteriorated without influencing the definition of the image. It can be seen that the field curvature is less than 2.4mm, and the maximum distortion is less than 22.7% at the maximum field of view.
Referring to fig. 9, in the vertical axis chromatic aberration diagram of the present embodiment, the vertical axis chromatic aberration is also called magnification chromatic aberration, which mainly means that one polychromatic main light ray of an object side becomes a plurality of light rays when the image side exits due to chromatic dispersion of the refraction system. Therefore, the maximum position of the field of view with the maximum dispersion is less than 97um, and the requirements of terminal users in the later period can be met by matching with software correction in the later period.
In order to ensure that the human eye 40 can obtain an enlarged display, the present invention proposes another embodiment. Referring again to fig. 1, the imaging lens 20 is a plano-convex lens, and the convex surface of the imaging lens 20 faces away from the display screen 10. Therefore, after the display light 110 is emitted to the imaging lens 20, the display light 110 is refracted on the outer surface 220 of the imaging lens 20, so that the light spot formed by the display light 110 becomes larger, and the display light 110 is refracted and reflected between the light splitting films 80 for a plurality of times, so that the light spot of the display light 110 becomes larger as the display light 110 passes through the imaging lens 20 for a plurality of times. Therefore, after being refracted and reflected, the display light 110 is further refracted by the outer surface 220 of the convex imaging lens 20, which is convenient for further enlarging the display picture. In addition, to ensure that the display light 110 is imaged clearly. In addition, also in order to ensure that the display light 110 is imaged clearly, the central thickness of the imaging lens 20 is defined as T1, the central distance between the inner surface 210 of the imaging lens 20 and the second surface 320 of the transparent plate 30 is defined as L1, and the central distance between the first surface 310 of the transparent plate 30 and the light emitting surface 120 of the display screen 10 is defined as L2, then, 5mm < T1<10mm, 2mm < L1<8mm, and 15mm < L2<20 mm. The distances among the imaging lens 20, the transparent plate 30 and the display screen 10 can be flexibly adjusted within the above-defined range, so that a clear display picture can be formed.
Likewise, in order to further improve the sharpness of the display light 110, the absolute value of the radius of curvature of the outer surface 220 of the imaging lens 20 is greater than 90 and less than 100, and the conic coefficient of the outer surface 220 is less than 10. In the present embodiment, the optical focal length f of the image display structure is 28.2mm, the focal length f1 of the imaging lens 2030 is 186.116mm, and the total system length of the entire image display structure is 41 mm. In addition, in the embodiment, clear imaging within a visible light range of 450nm to 630nm can be realized, in the display screen 1010, the display chip is 2.1 inches, a visible range of an angle of 80 degrees can be realized, distortion is less than 22.2%, chromatic aberration is less than 167um, and a virtual image distance is 1500 mm. Specific parameters of this embodiment are shown in fig. 15 and 16.
Referring to fig. 10, in the present embodiment, the dot diagram is a dot diagram, in which after light emitted from a point passes through the image display structure, intersection points of the light and the image plane are no longer concentrated on the same point due to aberration, and a diffusion pattern scattered in a certain range is formed for evaluating the imaging quality of the image display structure. The smaller the root mean square radius value and the geometric radius value, the better the imaging quality. The arrangement sequence of the regions 1-3 is from left to right and from top to bottom. Therefore, the maximum root mean square radius value corresponding to the maximum field of view is smaller than 66 um.
Referring to fig. 11, the field curvature and distortion diagram in the present embodiment is an image field curvature, which is mainly used to indicate the misalignment between the intersection point of the entire display light 110 and the ideal image point in the image display structure. The distortion refers to the aberration with different magnifications of different parts of an object when the object is imaged through an image display structure, and the distortion can cause the similarity of the object image to be deteriorated without influencing the definition of the image. It can be seen that the field curvature is less than 1.4mm, and the maximum distortion is less than 22.2% at the maximum field of view.
Referring to fig. 12, in the vertical axis chromatic aberration diagram of the present embodiment, the vertical axis chromatic aberration is also called magnification chromatic aberration, which mainly means that one polychromatic main light ray of an object side becomes a plurality of light rays when the image side exits due to chromatic dispersion of a refraction system. Therefore, the maximum position of the field of view with the maximum dispersion is less than 166.7um, and the requirements of end users in the later period can be met by matching with the later-period software correction
The display light 110 emitted from the display screen 10 is in a linear polarization state, so as to ensure that the display light 110 can be smoothly refracted and reflected between the light splitting film 80 and the polarization reflection film 50. To this end, the image display structure further includes a second quarter-wave plate (not shown), and the second quarter-wave plate is disposed on the light emitting surface 120 of the display screen 10. Therefore, after the display light 110 in the linear polarization state encounters the second quarter-wave plate, the linear polarization state is converted into the circular polarization state, thereby ensuring that the display light 110 is smoothly refracted and reflected.
The invention also provides a head-mounted display device, which comprises a shell and the image display structure, wherein the image display structure is arranged on the shell.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. An image display structure, comprising:
a display screen for emitting display light;
the imaging lens is arranged in the emergent direction of the display light;
a transparent plate disposed in an optical path between the display screen and the imaging lens;
the transparent plate is provided with a first surface facing the display screen and a second surface facing away from the display screen, the imaging lens is provided with an inner surface facing the transparent plate and an outer surface facing away from the transparent plate, the first surface or the second surface of the transparent plate is provided with a light splitting film, and the outer surface of the imaging lens is provided with a polarization reflection film; and
the first quarter-wave plate is arranged on one side, facing the transparent plate, of the polarization reflection film, and defines that the central distance between the inner surface of the imaging lens and the second surface of the transparent plate is L1, and the central distance between the first surface of the transparent plate and the light-emitting surface of the display screen is L2, so that the distance between 2mm < L1<8mm, and the distance between 15mm < L2<20 mm;
the image display structure further comprises a second quarter wave plate, and the second quarter wave plate is arranged on the light-emitting surface of the display screen.
2. The image display structure of claim 1, wherein the light splitting film is disposed on the second surface of the transparent plate, the first quarter-wave plate is disposed on the outer surface of the imaging lens, and the polarization reflective film is disposed on a side of the first quarter-wave plate opposite to the imaging lens.
3. The image display structure of claim 2, further comprising an anti-reflective film disposed on the first surface of the transparent plate.
4. The image display structure of claim 3, further comprising a polarizer disposed on a side of the polarizing reflective film facing away from the transparent plate.
5. The image display structure according to any one of claims 1 to 4, wherein the imaging lens is a meniscus lens with the convex surface of the imaging lens facing away from the display screen, the thickness of the center of the imaging lens being defined as T1, then 5mm < T1<10 mm.
6. The image display structure of claim 5, wherein an absolute value of a radius of curvature of the outer surface of the imaging lens is greater than 75 and less than 80, and a conic coefficient of the outer surface is less than 6.
7. The image display structure of claim 5, wherein the image display structure has an optical distortion of less than 22.6%, an imaging chromatic aberration of less than 97um, and a virtual image distance of 1500 mm.
8. The image display structure according to any one of claims 1 to 4, wherein the imaging lens is a plano-convex lens with its convex surface facing away from the display screen, and the central thickness of the imaging lens is defined as T1, then 5mm < T1<10 mm.
9. The image display structure of claim 8, wherein an absolute value of a radius of curvature of the outer surface of the imaging lens is greater than 90 and less than 100, and a conic coefficient of the outer surface is less than 10.
10. The image display structure of claim 8, wherein the image display structure has an optical distortion of less than 22.2%, an imaging chromatic aberration of less than 167um, and a virtual image distance of 1500 mm.
11. A head-mounted display device, characterized in that the head-mounted display device comprises a housing and an image display structure according to any of claims 1 to 10, which image display structure is provided at the housing.
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| CN202011020556.9A CN111929907B (en) | 2020-09-25 | 2020-09-25 | Image display structure and head-mounted display device |
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| CN202011020556.9A CN111929907B (en) | 2020-09-25 | 2020-09-25 | Image display structure and head-mounted display device |
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| CN112596238B (en) * | 2020-12-21 | 2022-09-20 | 歌尔光学科技有限公司 | Imaging optical path and head-mounted display device |
| CN113848598B (en) * | 2021-09-29 | 2023-03-24 | 青岛歌尔声学科技有限公司 | Film pasting method and lens assembly |
| CN113934007A (en) * | 2021-10-27 | 2022-01-14 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444046A (en) * | 2016-12-14 | 2017-02-22 | 浙江舜通智能科技有限公司 | Optical system and head-mounted display device provided with optical system |
| CN108351526A (en) * | 2016-02-04 | 2018-07-31 | 谷歌有限责任公司 | The nearly eye of compact shows optical element |
| KR101941459B1 (en) * | 2017-09-22 | 2019-01-23 | 엘지디스플레이 주식회사 | Display device having an eyepiece |
| CN110603478A (en) * | 2017-07-11 | 2019-12-20 | 谷歌有限责任公司 | Compact near-to-eye optical system including refractive beam-splitting convex lens |
| CN111443491A (en) * | 2020-04-30 | 2020-07-24 | 京东方科技集团股份有限公司 | Optical display system, control method and display device |
-
2020
- 2020-09-25 CN CN202011020556.9A patent/CN111929907B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108351526A (en) * | 2016-02-04 | 2018-07-31 | 谷歌有限责任公司 | The nearly eye of compact shows optical element |
| CN106444046A (en) * | 2016-12-14 | 2017-02-22 | 浙江舜通智能科技有限公司 | Optical system and head-mounted display device provided with optical system |
| CN110603478A (en) * | 2017-07-11 | 2019-12-20 | 谷歌有限责任公司 | Compact near-to-eye optical system including refractive beam-splitting convex lens |
| KR101941459B1 (en) * | 2017-09-22 | 2019-01-23 | 엘지디스플레이 주식회사 | Display device having an eyepiece |
| CN111443491A (en) * | 2020-04-30 | 2020-07-24 | 京东方科技集团股份有限公司 | Optical display system, control method and display device |
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