CN115576103A - Diopter-adjustable optical device and virtual reality display equipment - Google Patents
Diopter-adjustable optical device and virtual reality display equipment Download PDFInfo
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- CN115576103A CN115576103A CN202110753530.3A CN202110753530A CN115576103A CN 115576103 A CN115576103 A CN 115576103A CN 202110753530 A CN202110753530 A CN 202110753530A CN 115576103 A CN115576103 A CN 115576103A
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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
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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Abstract
The invention provides an optical device with adjustable diopter and virtual reality display equipment, wherein the optical device with the adjustable diopter comprises: a display unit for emitting image light in a first linear polarization state; the first quarter-wave plate, the first lens, the second quarter-wave plate, the reflection type polaroid and the third lens are sequentially arranged along the emitting direction of the image light; the first lens is movably arranged between the first quarter-wave plate and the second lens, and one side, close to the first quarter-wave plate, of the first lens is connected with a half-transmitting and half-reflecting element. Compared with the prior art, the relative position of the first lens can be changed, so that the diopter adjustable effect of the optical device is realized, namely the focal length of the optical device can be changed, the optical device is compatible with a myopia user, and the myopia user can obtain a clear image without wearing myopia glasses.
Description
Technical Field
The invention relates to the technical field of virtual reality, in particular to an optical device with adjustable diopter and virtual reality display equipment.
Background
With the continuous development of social productivity and scientific technology, the demand of various industries on VR technology is more and more vigorous, and the audience population of VR equipment is more and more extensive. VR equipment on the present market is when solving the problem that myopic user used, can be in eyes and display device intermediate headspace usually, and the glasses are corrected to the holding to let myopic user also can have good experience.
And along with VR equipment is littleer and smaller, user's correction glasses can produce the overlapping with the lens of VR equipment, cause the sense of oppression for the user easily, have reduced the comfort level of user at the use VR equipment in-process.
Disclosure of Invention
The invention aims to provide an optical device with adjustable diopter, which aims to solve the defects in the prior art.
The invention relates to an optical device with adjustable diopter, which comprises:
a display unit for emitting image light in a first linear polarization state; the first quarter-wave plate, the first lens, the second quarter-wave plate, the reflection type polaroid and the third lens are sequentially arranged along the emitting direction of the image light; the first lens is movably arranged between the first quarter-wave plate and the second lens, and one side of the first lens, which is close to the first quarter-wave plate, is connected with a transflective element; the included angle between the fast axis direction of the first quarter-wave plate and the fast axis direction of the second quarter-wave plate is 90 degrees; the reflective polarizer is used for reflecting light in a first linear polarization state and transmitting light in a second linear polarization state; and the image light rays are finally emitted after passing through the third lens.
Compared with the prior art, the relative position of the first lens can be changed, so that the diopter adjustable effect of the optical device is realized, namely the focal length of the optical device can be changed, the optical device is compatible with a myopia user, and the myopia user can obtain a clear image without wearing myopia glasses.
The invention also provides virtual reality display equipment which comprises the diopter-adjustable optical device, and the diopter-adjustable optical device can be compatible with a myopia user, and the myopia user can obtain clear images without wearing myopia glasses.
Drawings
FIG. 1 is a schematic diagram of an optical device according to the present invention;
FIG. 2 is a schematic view of the optical device of the present invention;
FIG. 3 is a schematic diagram illustrating the propagation of image light into the human eye according to the present invention;
FIG. 4 is a state diagram of the optical device of the present invention in use in one condition;
fig. 5 is a state diagram of the optical device of the present invention in another use.
Detailed Description
Referring to fig. 1 and 2, the present embodiment provides a diopter-adjustable optical device, which includes a display unit 10, a first quarter-wave plate 20, a first lens 30, a second lens 40, a second quarter-wave plate 50, a reflective polarizer 60, and a third lens 70.
The display unit 10 is used for emitting image light in a first linear polarization state. The first quarter-wave plate 20, the first lens 30, the second lens 40, the second quarter-wave plate 50, the reflective polarizer 60, and the third lens 70 are sequentially arranged in the image light emitting direction. After being emitted from the display unit 10, the image light passes through the first quarter-wave plate 20, the first lens 30, the second lens 40, the second quarter-wave plate 50, the reflective polarizer 60, and the third lens 70, and finally exits after passing through the third lens 70.
Wherein, the included angle between the fast axis direction of the first quarter-wave plate 20 and the fast axis direction of the second quarter-wave plate 50 is 90 °, and the effect that this kind of setting can reach is: if a linearly polarized light passes through the first quarter-wave plate 20 and the second quarter-wave plate 50 in sequence, the polarization state thereof will not be changed, for example, an S-polarized light still remains as the S-polarized light after passing through the first quarter-wave plate 20 and the second quarter-wave plate 50 in sequence.
The reflective polarizer 60 is used for reflecting light in a first linear polarization state and transmitting light in a second linear polarization state, specifically, in the present embodiment, light in the first linear polarization state is S-polarized light, and light in the second linear polarization state is P-polarized light.
The first lens 30 is movably disposed between the first quarter-wave plate 20 and the second lens 40, and a half-mirror 31 is connected to a side of the first lens 30 close to the first quarter-wave plate 20. By means of the arrangement, the relative position of the first lens 30 can be changed, so that the diopter adjustable effect of the optical device is achieved, namely the focal length of the optical device can be changed, the optical device can be compatible with a myopia user, and the myopia user can obtain clear images without wearing myopia glasses. The transflective element 31 has a function of reflecting and transmitting incident light, that is, when the incident light passes through the transflective element 31, a part of the incident light passes through the transflective element, and a part of the incident light is reflected back, in this embodiment, the transflective element 31 is specifically a transflective film attached to the first lens 30, and the transflective film specifically can be represented by a transmittance inverse ratio of 1:1 in the film.
The optical device uses the components, can ensure that all zooming positions can be clearly imaged in the zooming process, and has high imaging quality.
Referring to fig. 3, specifically, the image light (horizontal arrow in fig. 3) entering the human eye by the optical device of the present embodiment has the following propagation and polarization direction change processes:
the display unit 10 emits image light rays in a first linear polarization state (S-polarized light, perpendicular to the paper surface), which are sequentially transmitted through the first quarter-wave plate 20 and converted into image light rays in a left-handed circular polarization state, partially transmitted through the half-mirror 31 (50% of energy loss of the image light rays), transmitted through the first lens 30 and the second lens 40, transmitted through the second quarter-wave plate 50 and converted into image light rays in a first linear polarization state (the phase difference between the two quarter-wave plates is cancelled due to the fact that the angle between the fast axis direction of the first quarter-wave plate 20 and the fast axis direction of the second quarter-wave plate 50 is 90 °), reflected through the reflective polarizer 60 (the reflective polarizer 60 may reflect light rays in the first linear polarization state), transmitted through the second quarter-wave plate 50 again and converted into image light rays in a right-handed circular polarization state, transmitted through the second lens 40 and the first lens 30 again, partially reflected through the half-mirror 31 (50% of energy of the image light rays is again lost), transmitted through the first lens 30 and converted into image light rays in a second linear polarization state again through the second lens 50 (the reflective polarizer 60), and transmitted through the half-mirror 70), and finally transmitted through the second quarter-wave plate 60 and converted into image light rays in a second linear polarization state (the reflective polarizer 60), transmitted through the second lens 60, transmitted into image light rays in a third linear polarization state, and transmitted through the half-mirror 70, and transmitted in parallel to the reflective polarizer 60, and transmitted into image light rays (the second eye, and transmitted into the image light rays (the second eye, and transmitted through the reflective polarizer 60).
In the optical device of this embodiment, the energy utilization rate of the image light emitted from the display unit 10 is 25%.
In practical use, the reflectivity of the reflective polarizer 60 to S-polarized light is not 100%, so that a small amount of image light in the first linear polarization state still passes through the reflective polarizer 60 and enters human eyes through the third lens 70 during the image light propagation process, and this part of image light is stray light, which may reduce the contrast of the whole display screen. Therefore, it is preferable that a first absorption polarizer 80 is further disposed between the reflection polarizer 60 and the third lens 70, and the first absorption polarizer 80 absorbs the light in the first linear polarization state. The absorbing polarizer is configured to absorb the image light of the first linear polarization state transmitted through the reflective polarizer 60, thereby reducing stray light from the optical device and improving the contrast of the entire display.
Further preferably, the light incident surface and the light emitting surface of the first lens element 30 along the light emitting direction of the image are convex surfaces; the light incident surface of the second lens 40 along the image light emitting direction is a concave surface, and the light emergent surface along the image light emitting direction is a convex surface; the third lens element 70 is a plane along the light incident surface in the image light emitting direction, and is a convex surface along the light emitting surface in the image light emitting direction. Through this kind of setting, the image light quality that sees through lens is better, begins to be practical.
Preferably, in this embodiment, the second quarter-wave plate 50, the reflective polarizer 60, the first absorbing polarizer 80, and the first lens 30 are sequentially attached and mounted for convenience of manufacturing and mounting, and in some other embodiments, the second quarter-wave plate 50, the reflective polarizer 60, the first absorbing polarizer 80, and the first lens 30 may not be attached and fixed to each other, but may be mounted independently. Also preferably, the display unit 10 and the first quarter-wave plate 20 are attached to each other, and the effect is the same as above.
Specifically, in this embodiment, the display unit 10 includes a display panel for emitting image light in an unpolarized state to a second absorption-type polarizing plate (not shown) for transmitting the image light in the unpolarized state converted into the image light in a first linear polarization state, and the image light in the first linear polarization state is obtained more easily.
In addition, it can be understood that the effect of changing the relative position of the first lens 30 can be achieved by various structures, for example, three lens barrels are used, the first lens barrel, the second lens barrel and the third lens barrel are respectively a first lens barrel, a second lens barrel and a third lens barrel, the first lens barrel and the third lens barrel are relatively fixed, the second lens barrel is rotatably connected between the first lens barrel and the third lens barrel, the second lens barrel is rotated in different directions to move between the first lens barrel and the third lens barrel, wherein the display unit 10 and the first quarter-wave plate 20 are mounted on the first lens barrel, the first lens 30 is mounted on the second lens barrel, and the second lens 40, the second quarter-wave plate 50, the reflective polarizer 60 and the third lens 70 are mounted on the third lens barrel. The relative position of the first lens 30 can be changed by rotating the second barrel, which is not limited in this embodiment.
The optical device of the present embodiment adjusts the focal length (diopter) of the optical device by adjusting the position of the first lens 30, that is, can adjust the distance between the virtual images. The optical device may be compatible with a user with up to 700 degrees (7D) myopia, with the corresponding zoom position (first lens 30 position) shown in fig. 4, and with a corresponding virtual image distance of about 0.143m. If a non-myopic user uses the optical device, the corresponding zoom position is as shown in figure 5, and the corresponding virtual image distance is infinity.
The diopter-adjustable optical device described above can be applied to a virtual reality display apparatus including the diopter-adjustable optical device described above. The virtual reality display device may further include a mirror frame, and the optical device is disposed in the mirror frame.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "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 used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. An optical device with diopter adjustment, comprising:
a display unit for emitting image light of a first linear polarization state;
the first quarter-wave plate, the first lens, the second quarter-wave plate, the reflection type polaroid and the third lens are sequentially arranged along the emitting direction of the image light;
the first lens is movably arranged between the first quarter-wave plate and the second lens, and one side of the first lens, which is close to the first quarter-wave plate, is connected with a transflective element;
the included angle between the fast axis direction of the first quarter-wave plate and the fast axis direction of the second quarter-wave plate is 90 degrees;
the reflective polarizer is used for reflecting light in a first linear polarization state and transmitting light in a second linear polarization state;
and finally, the image light rays are emitted after passing through the third lens.
2. A diopter-adjustable optical device according to claim 1, characterized in that:
a first absorbing polarizer is also disposed between the reflective polarizer and the third lens, the first absorbing polarizer configured to absorb light of a first linear polarization state.
3. Diopter-adjustable optical device according to claim 2, characterized in that:
the light incident surface and the light emergent surface of the first lens along the image light emitting direction are convex surfaces;
the light incident surface of the second lens along the image light emitting direction is a concave surface, and the light emergent surface along the image light emitting direction is a convex surface;
the third lens is a plane along the light incident surface in the image light emitting direction, and a convex surface along the light emergent surface in the image light emitting direction.
4. A diopter-adjustable optical device according to claim 2, characterized in that:
and the second quarter-wave plate, the reflection type polaroid, the first absorption type polaroid and the first lens are sequentially attached and installed.
5. Diopter-adjustable optical device according to claim 4, characterized in that:
the display unit is attached to the first quarter-wave plate.
6. A diopter-adjustable optical device according to any of claims 1-5, characterized in that:
the display unit comprises a display screen and a second absorption type polaroid, wherein the display screen is used for emitting image light rays in a non-polarized state to the second absorption type polaroid, and the second absorption type polaroid is used for transmitting and converting the image light rays in the non-polarized state into the image light rays in a first linear polarization state.
7. A virtual reality display apparatus comprising the diopter-adjustable optical device of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110753530.3A CN115576103A (en) | 2021-07-02 | 2021-07-02 | Diopter-adjustable optical device and virtual reality display equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110753530.3A CN115576103A (en) | 2021-07-02 | 2021-07-02 | Diopter-adjustable optical device and virtual reality display equipment |
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| CN115576103A true CN115576103A (en) | 2023-01-06 |
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| CN202110753530.3A Pending CN115576103A (en) | 2021-07-02 | 2021-07-02 | Diopter-adjustable optical device and virtual reality display equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI823809B (en) * | 2023-04-13 | 2023-11-21 | 新鉅科技股份有限公司 | Optical lens assembly and head-mounted electronic device |
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2021
- 2021-07-02 CN CN202110753530.3A patent/CN115576103A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI823809B (en) * | 2023-04-13 | 2023-11-21 | 新鉅科技股份有限公司 | Optical lens assembly and head-mounted electronic device |
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