CN216561221U - Optical system of miniaturized head-mounted display - Google Patents
Optical system of miniaturized head-mounted display Download PDFInfo
- Publication number
- CN216561221U CN216561221U CN202120801551.3U CN202120801551U CN216561221U CN 216561221 U CN216561221 U CN 216561221U CN 202120801551 U CN202120801551 U CN 202120801551U CN 216561221 U CN216561221 U CN 216561221U
- Authority
- CN
- China
- Prior art keywords
- polarized light
- optical
- reflective
- partially
- optical system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides an optical system of a miniaturized head-mounted display, which is characterized in that at least one phase delay element, a partially-penetrated partial reflection element and a reflection type polarization element are arranged behind an optical module and in front of a display screen, so that light rays emitted by the display screen are subjected to polarization, reflection and re-polarization for multiple times after incidence to obtain polarized light capable of penetrating through a last layer of reflection type polarization element, the polarized light is introduced into human eyes after passing through the reflection type polarization element and then enters the optical module, when at least one optical lens in the optical module is N,
n is more than or equal to 1 and less than or equal to 3, wherein VdjAnd njAbbe number and refraction of optical lensThe ratio j is more than or equal to 1 and less than or equal to 3. All optical elements are coaxial, and the shortest distance between the display screen and the final optical module is obtained under the condition that light rays are in approximate optical paths through multiple polarization and reflection, so that the purpose of miniaturization of the head-mounted display is achieved.
Description
Technical Field
The present invention relates to a head-mounted display technology, and more particularly, to an optical system for a miniaturized head-mounted display.
Background
A Head-mounted display (Head-mounted display) is a device for displaying images and colors, and generally, in the form of an eye mask or a helmet, a display screen is close to eyes of a user, and a focal length is adjusted through an optical path to project a picture to the eyes in a short distance, so that a virtual image amplification effect is generated, and the experience of the scene is enhanced.
Fig. 1 shows a virtual reality head-mounted display, an image projected by a display screen 10 enters an optical module 20 after passing through a light path with an optical path length d, and the optical module 20 guides the image into a human eye 22 of a user, and assuming that the optical path length d is 40mm, the length of the head-mounted display is inevitably greater than 40mm after the optical path length d is added with the optical module, an eye distance and a shell, which is slightly heavy for an eye mask and a helmet worn on the head, so that it is an important subject to reduce the thickness of the head-mounted display and facilitate the wearing and use of the user.
Therefore, the present invention provides an optical system of a miniaturized head-mounted display, which effectively solves the above problems, and the specific structure and the implementation thereof are described in detail below:
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide an optical system of a miniaturized head-mounted display, which is characterized in that optical elements such as a polarization element, a phase delay element, a partial reflection partial penetration element and the like are arranged between a display screen and an optical module of the head-mounted display, and the optical path with approximate length is achieved by utilizing the phase delay and multiple reflection of light rays so as to shorten the distance between the display screen and the optical module and miniaturize the head-mounted display.
Another objective of the present invention is to provide an optical system of a miniaturized head-mounted display, in which all optical elements are coaxially arranged and adjusted according to the polarization condition of the display screen, so as to increase the variability and flexibility of the configuration of the optical system while shortening the distance between the display screen and the optical module.
To achieve the above object, the present invention provides an optical system for miniaturized head-mounted display, comprising: a display screen for outputting images and emitting polarized light; a partially reflective partially transmissive element disposed corresponding to the display screen for partially reflecting the polarized light and partially transmitting the partially reflective lightA transparent element; a second phase delay element corresponding to the partially reflective partially transmissive element for phase delaying the polarized light partially transmitted through the partially reflective partially transmissive element into polarized light of a second polarization angle; a reflective polarization element, which is arranged corresponding to the second phase delay element, receives the polarized light of the second polarization angle, totally reflects the polarized light to the second phase delay element, and reflects the polarized light of the second polarization angle to the second phase delay element, after the polarized light of the second polarization angle passes through the second phase delay element and the partial reflection part transmission element, the polarized light of the second polarization angle is reflected to the second phase delay element and the reflective polarization element by the partial reflection part transmission element and is transmitted; and an optical module corresponding to the reflective polarizer, the optical module including at least one optical lens for receiving the polarized light penetrating through the reflective polarizer and guiding the polarized light to at least one eye, wherein when the number of the at least one optical lens in the optical module is N,
wherein VdjIs Abbe number, n, of the optical lensjJ is more than or equal to 1 and less than or equal to 3.
According to an embodiment of the present invention, a radius of curvature of an optical surface of the at least one optical lens of the optical module closest to the human eye is Reye，
According to an embodiment of the present invention, a first lens is disposed closest to the human eye of the at least one optical lens, the first lens does not include a planar light-transmitting element and a polarizing film, and a curvature radius of an optical surface of the first lens facing the human eye is R1And the radius of curvature of the other side is R2The maximum visible radius of the optical system is H,
according to an embodiment of the present invention, an optical surface of the at least one optical lens of the optical module closest to the human eye is a plane, a sphere, an aspheric surface, a fresnel surface, a free pattern or a partially concave convex portion.
According to an embodiment of the present invention, the optical module includes a linear polarizer disposed on a planar light-transmitting element or the optical lens.
According to an embodiment of the present invention, the linear polarizer is disposed on the last surface of the optical module, and the second phase retarder and the reflective polarizer are disposed on the linear polarizer.
According to an embodiment of the present invention, the second phase retarder and the reflective polarizer are disposed on a final surface of the optical lens in the optical module.
According to the embodiment of the utility model, the thickness of the optical module is TTL, and 1 ≦ TTL ≦ 11.
According to the embodiment of the present invention, the focal length of the reflective surface of the partially reflective partially transmissive element is fs, 122 ≦ fs ≦ infinity, and when the reflectivity/transmittance of the partially reflective partially transmissive element is 50/50,
f is the effective focal length of the optical system.
According to an embodiment of the present invention, when the at least one optical lens in the optical module satisfies
In this case, the at least one optical lens does not include a plate glass element and a polarizer.
According to an embodiment of the present invention, the reflective polarizing element is a polarizer and the second phase retardation element is a phase retardation plate.
According to an embodiment of the present invention, the reflective polarizing element is an element having a reflective polarizing function disposed in the optical module, or a mirror having a reflective polarizing function disposed in the optical module, and the second phase retardation element is a phase retardation plate.
According to an embodiment of the present invention, the reflective polarizing element is an element with reflective polarization function disposed in the optical module, or a mirror with reflective polarization function in the optical module, and the second phase retardation element is also disposed in the optical module, and is an element with phase retardation function before the reflective polarizing element, or a mirror with phase retardation function in the optical module.
According to an embodiment of the utility model, the polarized light that is sent out of the display screen and enters the partially reflective partially transmissive element is circularly polarized light.
According to an embodiment of the present invention, the polarized light sent out by the display screen is linearly polarized light, and a first phase retardation element is further disposed between the display screen and the partially reflective transmissive element for performing a first phase retardation on the polarized light to obtain polarized light with a first polarization angle, and the linearly polarized light is converted into circularly polarized light after passing through the first phase retardation element.
According to an embodiment of the present invention, the reflective polarizer totally reflects the polarized light of the second polarization angle back to the second phase retardation element, so that the polarized light of the second polarization angle penetrates through the second phase retardation element and becomes polarized light of a third polarization angle, the polarized light of the third polarization angle penetrates through the second phase retardation element and becomes polarized light of a fourth polarization angle after being partially reflected back to the second phase retardation element by the partially reflective partially transmissive element, and the polarized light of the fourth polarization angle penetrates through the reflective polarizer.
In this case, the polarized light with the second polarization angle partially penetrates the second phase retardation element to be linearly polarized light, and the polarized light after being reflected by the reflective polarization element to penetrate the second phase retardation element to be circularly polarized light.
According to an embodiment of the present invention, the polarized light of the second polarization angle reflected by the reflective polarizer is linearly polarized light, and the polarized light of the fourth polarization angle transmitted by the reflective polarizer is linearly polarized light.
According to an embodiment of the present invention, the polarized light sent by the display panel is in an unspecified polarization state, a linear polarizer and a first phase retardation element are further disposed between the display panel and the partially reflective transmissive element, the linear polarizer is disposed between the display panel and the first phase retardation element, the polarized light provided by the display panel becomes linearly polarized light after passing through the linear polarizer, the first phase retardation element performs a first phase retardation on the linearly polarized light to become polarized light of a first polarization angle, and the polarized light of the first polarization angle is converted into circularly polarized light.
According to an embodiment of the present invention, the optical module is a lens that is planar, spherical, aspherical, fresnel-surface, free-form or partially concave, and is a combination of one or more sheets of lenses.
Drawings
Fig. 1 is a schematic diagram of an optical path between a display screen of a head-mounted display and a human eye in the prior art.
Fig. 2A and 2B are schematic diagrams of an optical system of a miniaturized head-mounted display according to an embodiment of the present invention.
FIG. 3A is a schematic diagram of an optical system of a miniaturized head-mounted display according to another embodiment of the present invention.
Fig. 3B and 3C are schematic diagrams illustrating a conventional head-mounted display and an optical system of the head-mounted display in fig. 3A according to an embodiment of the utility model.
FIG. 4 is a schematic diagram of an optical system of a miniaturized head-mounted display according to another embodiment of the present invention.
FIG. 5 is a schematic diagram of an optical system of a miniaturized head-mounted display according to another embodiment of the present invention.
Fig. 6 to 12 are schematic views of optical systems of miniaturized head-mounted displays according to still another embodiment of the present invention.
Description of reference numerals: 10-a display screen; 11-linear polarizer; 12-a first phase delay element; 14-partially reflective partially transmissive element; 16-a second phase delay element; 18-reflective polarizing element; 19-optic, first lens; 20-an optical module; 202-a planar light transmissive element; 204-linear polarizer; 205-a first lens; 206-a second lens; 208-a third lens; 22-human eye.
Detailed Description
The utility model provides an optical system of a miniaturized head-mounted display, which is applied to the head-mounted display, in particular to a virtual reality system of the head-mounted display.
Referring to fig. 2A and 2B, which are schematic diagrams of an embodiment of an optical system of a miniaturized head-mounted display according to the present invention, including a display screen 10, a partially reflective transmissive element 14, a second phase retardation element 16, a reflective polarizer 18, and an optical module 20, referring to fig. 2A, in this embodiment, the display screen 10 outputs an image and emits polarized light, such as the polarized light 1 shown in the figure; the partially reflective and partially transmissive element 14 is disposed corresponding to the display screen 10, and reflects part of the incident polarized light 1 back to the display screen 10, and the rest penetrates through the partially reflective and partially transmissive element 14, in a preferred embodiment, the partially reflective and partially transmissive element 14 is half reflective and half transmissive; in addition, in this embodiment, the second phase retardation element 16 is an independent phase retardation plate, the reflective polarization element 18 is an independent polarizer, and the second phase retardation element 16 is disposed corresponding to the partially reflective partially transmissive element 14, and performs a second phase retardation on the polarized light 1 transmitted through the partially reflective partially transmissive element 14 to obtain a polarized light 2 with a second polarization angle; the reflective polarizing element 18 is disposed corresponding to the second phase retardation element 16, and totally reflects the polarized light 2 back to the second phase retardation element 16, and the polarized light 2 is polarized once again after penetrating the second phase retardation element 16 to become the polarized light 3 with a third polarization angle.
Referring to fig. 2B, the polarized light 3 with the third polarization angle penetrates the second phase retardation element 16 and reaches the partially reflective partially transmissive element 14, and then is partially reflected by the partially reflective partially transmissive element 14 back to the second phase retardation element 16 (the partially transmitted portion is energy loss), and is polarized after penetrating the second phase retardation element 16 to become the polarized light 4 with the fourth polarization angle, at this time, the fourth polarization angle of the polarized light 4 meets the penetration condition of the reflective polarizer 18, so that the polarized light 4 can penetrate the reflective polarizer 18 and irradiate the corresponding optical module 20, and the optical module 20 guides the polarized light 4 into at least one human eye 22.
In a first embodiment, the light emitted from the display panel 10 is circularly polarized light with 45 degree polarization, so the first polarization angle is 45 degrees (i.e. the polarized light 1 is 45 degree polarized light), the second phase retardation element 16 is a 45 degree polarization element, the second polarization angle is 90 degrees (i.e. the polarized light 2 is 90 degree polarized light), the third polarization angle is 135 degrees (i.e. the polarized light 3 is 135 degree polarized light), and the fourth polarization angle is 180 degrees (i.e. the polarized light 4 is 180 degree polarized light). In this embodiment, the reflective polarizer 18 provides only 180 degree polarized light transmission, and thus the polarized light 4 may pass through the reflective polarizer 18.
In a second embodiment, the display screen 10 has different polarization states, wherein the first polarization angle is 135 degrees (i.e. the polarized light 1 is 135 degrees polarized light), but the same is emitting circularly polarized light, the second phase retardation element 16 is a 45-degree polarization element, the second polarization angle is 0 or 180 degrees (i.e. the polarized light 2 is 0 or 180 degrees polarized light), the third polarization angle is 45 degrees (i.e. the polarized light 3 is 45 degrees polarized light), and the fourth polarization angle is 90 degrees (i.e. the polarized light 4 is 90 degrees polarized light). In this embodiment, the reflective polarizer 18 provides only 90 degree polarized light transmission, and thus the polarized light 4 may pass through the reflective polarizer 18.
In the embodiment of fig. 2A and 2B, the polarized light 1 emitted by the display screen 10 is circularly polarized light; the polarized light 2 partially transmitted through the second phase retardation element 16 is linearly polarized light, while the polarized light 2 reflected by the reflective polarizing element 18 is also linearly polarized light, but the polarized light 3 after passing through the second phase retardation element 16 becomes circularly polarized light. This polarized light 3 is originally circularly polarized light, but after being partially reflected by the second phase retardation element 16 and passing through the second phase retardation element 16 again, the polarized light 4 becomes linearly polarized light until the polarized light 4 passing through the reflective polarizer 18 remains linearly polarized light.
In the present invention, the focal length of the reflective surface of the partially reflective transmissive element 14 is fs, 122 ≦ fs ≦ infinity, and when the reflectivity/transmittance of the partially reflective transmissive element is 50/50,
f is the effective focal length of the optical system.
In the present invention, the optical module 20 is a lens with a plane surface, a spherical surface, an aspherical surface, a fresnel surface, a free form or a partially concave convex surface, and is a combination of one or more pieces of lenses.
FIG. 3A is a schematic diagram of an optical system of a miniaturized head-mounted display according to another embodiment of the present invention. If the display screen 10 emits not circularly polarized light but linearly polarized light, as shown in fig. 3A, a first phase retardation element 12 needs to be added behind the display screen 10 to convert the polarized light emitted by the display screen 10 into circularly polarized light, and perform a first phase retardation to convert the circularly polarized light into polarized light 1 with a first polarization angle. After passing through the partially reflective partially transmissive element 14, part of the polarized light 1 is reflected back to the first phase retardation element 12, and the rest of the polarized light passes through the partially reflective partially transmissive element 14; the polarized light 1 partially transmitted through the partially reflective partially transmissive element 14 then passes through the second phase retardation element 16 and becomes polarized light 2 of the second polarization angle after the second phase retardation; the polarized light 2 is totally reflected by the reflective polarizing element 18 back to the second phase retardation element 16, and is polarized again to be the polarized light 3 of the third polarization angle after passing through the second phase retardation element 16. The polarized light 3 penetrates the second phase retardation element 16 and reaches the partially reflective partially transmissive element 14, and then is partially reflected by the partially reflective partially transmissive element 14 back to the second phase retardation element 16 (the partially transmitted portion is energy loss), and is polarized after penetrating the second phase retardation element 16, so as to become the polarized light 4 with a fourth polarization angle, at this time, the fourth polarization angle of the polarized light 4 conforms to the penetration condition of the reflective polarization element 18, so that the polarized light 4 can penetrate the reflective polarization element 18 and irradiate the corresponding optical module 20, and the optical module 20 guides the polarized light 4 into at least one human eye 22.
In a third embodiment, the polarized light emitted from the display screen 10 is linearly polarized at 0 degree, the first phase retardation element 12 is a 45-degree polarization element, so that the first polarization angle is 45 degrees (i.e. the polarized light 1 is 45-degree polarized light), the second phase retardation element 16 is a 45-degree polarization element, the second polarization angle is 90 degrees (i.e. the polarized light 2 is 90-degree polarized light), the third polarization angle is 135 degrees (i.e. the polarized light 3 is 135-degree polarized light), and the fourth polarization angle is 180 degrees (i.e. the polarized light 4 is 180-degree polarized light). In this embodiment, the reflective polarizer 18 provides only 180 degree polarized light transmission, and thus the polarized light 4 may pass through the reflective polarizer 18.
In a fourth embodiment, the display panel emits 90-degree linearly polarized light, and the first phase retardation element 12 is a 45-degree polarization element, so that the first polarization angle is 135 degrees (i.e., the polarized light 1 is 135-degree polarized light), the second phase retardation element 16 is also a 45-degree polarization element, the second polarization angle is 0 or 180 degrees (i.e., the polarized light 2 is 0 or 180-degree polarized light), the third polarization angle is 45 degrees (i.e., the polarized light 3 is 45-degree polarized light), and the fourth polarization angle is 90 degrees (i.e., the polarized light 4 is 90-degree polarized light). In this embodiment, the reflective polarizer 18 provides only 90 degree polarized light transmission, and thus the polarized light 4 may pass through the reflective polarizer 18.
Fig. 3B and fig. 3C are schematic comparison diagrams of the optical systems of the conventional head-mounted display in fig. 1 and the head-mounted display in fig. 3A according to the present invention. The present invention can be configured to set the first phase retardation element 12 and the partially reflective and partially transmissive element 14 as a set, and the second phase retardation element 16 and the reflective and polarizing element 18 as a set, for example, the second phase retardation element 16 and the reflective and polarizing element 18 can be the same lens, for example, the reflective and polarizing element is disposed on the side of the second phase retardation element 16 close to the optical module 20 and is used as the reflective and polarizing element 18, or the same lens can be made with special materials to have the functions of phase retardation and reflective and polarizing, and similarly, the first phase retardation element 12 and the partially reflective and partially transmissive element 14 can also be made on the same lens through material selection. As is well known, the thickness of the lens affects the refractive index and the optical path, and as the thickness of the lens is thicker, the refractive index is higher, so the difference of the optical paths is higher, but the error is very small and still within the allowable range, so fig. 3B and 3C can be said to have almost the same optical path d (total length of the dotted line in the figure), but the optical system of the present invention has a shorter back focal distance, which can shorten the back focal distance of the conventional head-mounted display to 0.3 to 0.7 times, and can achieve the same clear image effect as the conventional head-mounted display.
FIG. 4 is a schematic diagram of an optical system of a miniaturized head-mounted display according to another embodiment of the present invention. If the display panel 10 has no specific polarization state, as shown in fig. 4, a linear polarizer 11 needs to be added behind the display panel 10 and before the first retardation element 12 to convert the polarized light emitted from the display panel 10 into linearly polarized light, the linearly polarized light passes through the first retardation element 12 to become the polarized light 1 with the first polarization angle, and the polarized light 1 becomes circularly polarized light. After passing through the partially reflective partially transmissive element 14, part of the polarized light 1 is reflected back to the first phase retardation element 12, and the rest of the polarized light passes through the partially reflective partially transmissive element 14; the polarized light 1 partially transmitted through the partially reflective partially transmissive element 14 then passes through the second phase retardation element 16 and becomes polarized light 2 of the second polarization angle after the second phase retardation; the polarized light 2 is totally reflected by the reflective polarizing element 18 back to the second phase retardation element 16, and is polarized again to be the polarized light 3 of the third polarization angle after passing through the second phase retardation element 16. The polarized light 3 penetrates the second phase retardation element 16 and reaches the partially reflective partially transmissive element 14, and then is partially reflected by the partially reflective partially transmissive element 14 back to the second phase retardation element 16 (the partially transmitted portion is energy loss), and is polarized after penetrating the second phase retardation element 16, so as to become the polarized light 4 with a fourth polarization angle, at this time, the fourth polarization angle of the polarized light 4 conforms to the penetration condition of the reflective polarization element 18, so that the polarized light 4 can penetrate the reflective polarization element 18 and irradiate the corresponding optical module 20, and the optical module 20 guides the polarized light 4 into at least one human eye 22.
In a fifth embodiment, if the first phase retardation element 12 and the second phase retardation element 16 are 45-degree polarization elements, the partially-reflective partially-transmissive element 14 is half-reflective and half-transmissive, and the reflective polarization element 18 only provides 180-degree polarization for transmission, in a state where the display panel 10 has no specific polarization state, the first phase retardation element 11 is first passed through the linear polarizer 11 and then changed into a linearly polarized light, then the first phase retardation element 12 is passed through to increase 45-degree phase retardation, so that the 45-degree polarization light 1 passes through the first phase retardation element 12, then the partially-transmissive partially-reflective element 14 is passed through to partially-45-degree polarization light 1, and after passing through the second phase retardation element 16, the 90-degree phase-delayed polarization light 2 is polarized and totally reflected on the reflective polarization element 18, the reflected light is passed through the second phase retardation element 16 again, and the phase of the polarization light 3 is adjusted from 90-degree retardation to 135-degree retardation, then, the polarized light 3 is reflected back to the second phase retardation element 16 by partially transmitting the partially reflective element 14, and the phase retardation of the polarized light 3 is adjusted from 135 degrees to 180 degrees of the polarized light 4 with the original polarization state, so that the polarized light can be incident into the optical module 20.
In a sixth embodiment, the display panel 10 has no specific polarization state, but the linear polarizer 11 emits 90-degree linearly polarized light, the first phase retardation element 12 is a 45-degree polarization element, so that the first polarization angle is 135 degrees (i.e. the polarized light 1 is 135-degree polarized light), the second phase retardation element 16 is a 45-degree polarization element, the second polarization angle is 0 or 180 degrees (i.e. the polarized light 2 is 0 or 180-degree polarized light), the third polarization angle is 45 degrees (i.e. the polarized light 3 is 45-degree polarized light), and the fourth polarization angle is 90 degrees (i.e. the polarized light 4 is 90-degree polarized light). In this embodiment, the reflective polarizer 18 provides only 90 degree polarized light transmission, and thus the polarized light 4 may pass through the reflective polarizer 18.
All the elements of the present invention are coaxial, and are adjusted by increasing or decreasing the display screen 10 and the linear polarizer 11 of fig. 3A and fig. 4 according to the polarization state of the display screen of the head-mounted display, in short, if the display screen 10 emits circularly polarized light, the linear polarizer 11 and the first phase retardation element 12 are not required to be disposed; if the display screen 10 emits linearly polarized light, a first phase delay element 12 needs to be arranged; if the display panel 10 emits polarized light having no specific polarization, the linear polarizer 11 and the first phase retarder 12 need to be provided at the same time.
For example, the optical path from the display screen 10 to the optical module 20 in fig. 3A undergoes multiple reflections, so if the total length of the optical path from the display screen 10 to the optical module 20 in the embodiment of fig. 3A is d, which is nearly the same as the optical path d from the display screen 10 to the optical module 20 in the prior art in fig. 1, but since the total length of the optical path from the display screen 10 to the optical module 20 in the embodiment of fig. 3A undergoes multiple reflections, the actual length from the display screen 10 to the optical module 20 is much shorter than the length from the display screen 10 to the optical module 20 in fig. 1, thereby achieving the purpose of shortening the length of the head-mounted display.
The optical module 20 may further include at least one optical lens, for example, the reflective polarizer 18, or both the reflective polarizer 18 and the second phase retardation element 16 are disposed in the optical module, and if only the reflective polarizer is disposed in the optical module, it may be an element with reflective polarization function; if both are disposed in the optical module, as shown in fig. 5, the reflective polarizer 18 is a reflective polarizer, and the second phase retardation element 16 is a phase retardation element before the reflective polarizer 18. Thus, the back focal length can be made shorter. In summary, the radius of curvature of the optical surface closest to the human eye 22 (e.g. the surface of the lens 19 close to the human eye 22 in fig. 5) of at least one optical lens of the optical module 20 is Reye，
Furthermore, the optical surface of this lens 19 closest to the human eye 22 is planar, spherical, aspherical, fresnel-shaped, free-form or partially concave and convex.
In an embodiment of the present invention, the optical module closest to the human eye 22 is a first lens (e.g. the lens 19 of fig. 5), the first lens 19 does not include a planar light-transmitting element and a film with a polarizing function, and the first lens 19 does not include a planar light-transmitting element and a film with a polarizing functionThe optical surface of the first lens 19 facing the human eye has a radius of curvature R1(equal to R of the upper section)eye) And the radius of curvature of the other side is R2The maximum visible radius of the optical system of the present invention is H,
in addition, in another embodiment of the present invention, the optical module 20 includes a linear polarizer disposed on a planar transparent element or an optical lens. Referring to fig. 6, it is assumed that the optical module 20 includes a planar transparent element 202, and the linear polarizer 204 is disposed on the planar transparent element 202 by way of a lens or a coating. In addition, the linear polarizer may be further disposed on the rear-most side of the optical module 20, such as the linear polarizer 204 disposed on the rear-most lens in fig. 6, i.e. on the left side of the planar light-transmitting element 202, which is the rear-most side of the optical module 20.
In another embodiment, the second phase retarder 16 and the reflective polarizer 18 are disposed on the last side of the last optical lens of the optical module 20, or on the linear polarizer 204 on the last side of the optical module 20. Taking fig. 6 as an example, the positions of the second phase retarder 16 and the reflective polarizer 18 are changed to be on the line polarizer 204.
FIG. 7 shows another embodiment of the present invention, in which N optical lenses are provided in the optical module 20
Wherein VdjIs Abbe number, n, of an optical lensjIs the refractive index of the optical lens. At this time, the optical lens in the optical module 20 does not include a plate glass and a polarizer. Taking fig. 7 as an example, the optical lens of the optical module 20 includes three lenses, from the position near the human eye 22 to the display screen 10, a first lens 205, a second lens 206 and a third lens 208 with refractive indexes n1、n2、n3Abbe number is Vd1、Vd2、Vd3The first, second and third lenses205. 206, 208 do not include planar light-transmitting elements and polarizers, and
for example, although the first lens 205 in fig. 7 is planar, it may be a planar lens or a linear polarizer, rather than a planar transparent element or a polarizer.
Fig. 8 to 12 are schematic views of optical systems of miniaturized head-mounted displays according to other embodiments of the present invention. The embodiment of fig. 8 sequentially includes a display screen 10, a partially reflective partially transmissive element 14, a second phase retardation element 16, a reflective polarization element 18, a planar light-transmitting element 202, a linear polarizer 204, and a first lens 205, where the first lens 205 is an optical module and is a fresnel lens. The embodiment of fig. 9 sequentially includes the display panel 10, the partially reflective partially transmissive element 14, the second phase retardation element 16, the reflective polarizing element 18, the planar light-transmissive element 202, the first lens 205, the planar light-transmissive element 202 and the linear polarizer 204, in which the first lens 205, the planar light-transmissive element 202 and the linear polarizer 204 are optical modules, and the first lens 205 is a fresnel lens. The embodiment of fig. 10 sequentially includes the display screen 10, the partially reflective transmissive element 14, the second phase retardation element 16, the reflective polarizing element 18, the planar transmissive element 202, the second lens 206, the linear polarizer 204, and the first lens 205, wherein the reflective polarizing element 18 and the first lens 205 are included in the optical module, and the first lens 205 is a spherical or aspheric lens, and the second lens 206 is a fresnel lens. The embodiment of fig. 11 sequentially includes the display screen 10, the partially reflective partially transmissive element 14, the second phase retardation element 16, the reflective polarizing element 18, the planar light transmissive element 202, the second lens 206, the first lens 205, the linear polarizer 204 and the planar light transmissive element 202, wherein the reflective polarizing element 18 and the planar light transmissive element 202 from the front of the human eye are all included in the optical module, and the first lens 205 is a spherical or aspheric lens, and the second lens 206 is a fresnel lens. The embodiment of fig. 12 sequentially includes the display screen 10, the partially reflective and partially transmissive element 14, the second phase retardation element 16, the reflective polarizing element 18, the planar light transmissive element 202, the linearly polarizing plate 204, the second lens 206 and the first lens 205, and the optical module of this embodiment includes the second lens 206 and the first lens 205, and the first lens 205 is a spherical lens or an aspherical lens and the second lens 206 is a spherical lens or an aspherical lens. As can be seen from the embodiments of fig. 8 to 12, the optical module 20 of the present disclosure may include one or more optical lenses, and may be a combination of a plurality of lenses, such as a planar lens, a concave lens, a biconvex lens, and the like. If the first lens 205 closest to the human eye in the optical module 20 is a planar lens, a linear polarizer 204 may be further disposed thereon to further remove stray light.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes or modifications of the features and the spirit described in the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. An optical system for miniaturized head-mounted displays, comprising:
a display screen for outputting images and emitting polarized light;
a partially reflective partially transmissive element disposed in correspondence with the display screen to partially reflect the polarized light and partially transmit the partially reflective partially transmissive element;
a second phase delay element disposed corresponding to the partially reflective partially transmissive element, for receiving the polarized light partially transmitted through the partially reflective partially transmissive element, and performing phase delay to obtain polarized light of a second polarization angle;
a reflective polarization element, which is arranged corresponding to the second phase delay element, receives the polarized light of the second polarization angle, totally reflects the polarized light to the second phase delay element, and reflects the polarized light of the second polarization angle to the second phase delay element, after the polarized light of the second polarization angle passes through the second phase delay element and the partial reflection part transmission element, the polarized light of the second polarization angle is reflected to the second phase delay element and the reflective polarization element by the partial reflection part transmission element and is transmitted; and
a set of optical modules corresponding to the reflective polarizer, the optical modules including at least one optical lens for receiving the polarized light penetrating the reflective polarizer and guiding the polarized light to at least one eye,
wherein, when the number of the at least one optical lens in the optical module is N,
wherein VdjIs the Abbe number, n, of the at least one optical lensjJ is more than or equal to 1 and less than or equal to 3.
2. The optical system of claim 1, wherein a first lens is disposed closest to the human eye, the first lens does not include a planar light-transmissive element and a polarizing membrane, and a curvature radius of an optical surface of the first lens facing the human eye is R1And the radius of curvature of the other side is R2The maximum visible radius of the optical system is H,
3. the optical system of claim 1, wherein the focal length of the reflective surface of the partially reflective transmissive element is fs, 122 ≦ fs ≦ infinity, and when the reflectivity/transmissivity of the partially reflective transmissive element is 50/50,
f is the effective focal length of the optical system.
4. The optical system of claim 1, wherein a radius of curvature of an optical surface of the at least one optical lens of the optical module closest to the human eye is Reye，
5. The optical system of claim 1 or 4, wherein an optical surface of the at least one optical lens of the optical module closest to the human eye is a plane, a sphere, an aspheric surface, a Fresnel surface, a free pattern or a partially concave convex portion.
6. The optical system of claim 1, wherein the optical module comprises a linear polarizer disposed on a planar transparent element or the optical lens.
7. The optical system of claim 6, wherein the linear polarizer is disposed on the last side of the optical module, and the second phase retarder and the reflective polarizer are disposed on the linear polarizer.
8. The optical system of claim 1, wherein the second phase retarder and the reflective polarizer are disposed on a rear-most surface of the optical lens in the optical module.
9. The optical system of claim 1, wherein the thickness of the optical module is TTL, 1 ≦ TTL ≦ 11.
10. The optical system of claim 1, wherein the at least one optical lens of the optical module satisfies the requirements
In this case, the at least one optical lens does not include a plate glass and a polarizer.
11. The optical system of claim 1, wherein the reflective polarizer is a polarizer and the second phase retarder is a phase retarder.
12. The optical system of claim 1, wherein the reflective polarizer is a reflective polarizer or a reflective mirror in the optical module, and the second phase retarder is a phase retarder.
13. The optical system of claim 1, wherein the reflective polarizer is a reflective polarizer or a reflective polarizer in the optical module, and the second phase retardation element is a phase retardation element before the reflective polarizer or a phase retardation lens in the optical module.
14. The optical system of claim 1, wherein the polarized light emitted from the display screen and entering the partially reflective partially transmissive element is circularly polarized light.
15. The optical system of claim 1, wherein the polarized light emitted from the display panel is linearly polarized light, and a first phase retardation element is disposed between the display panel and the partially reflective transmissive element for performing a first phase retardation on the polarized light to obtain a polarized light with a first polarization angle, and the linearly polarized light is converted into circularly polarized light after passing through the first phase retardation element.
16. The optical system of claim 1, wherein a portion of the polarized light with the second polarization angle that penetrates the second phase retardation element is linearly polarized light, and a portion of the polarized light that penetrates the second phase retardation element after being reflected by the reflective polarizer element is circularly polarized light.
17. The optical system of claim 1, wherein the reflective polarizer totally reflects the polarized light of the second polarization angle back to the second phase retardation element, so that the polarized light of the second polarization angle penetrates the second phase retardation element and becomes polarized light of a third polarization angle, the polarized light of the third polarization angle is partially reflected back to the second phase retardation element by the partially reflective partially transmissive element and then penetrates the second phase retardation element and becomes polarized light of a fourth polarization angle, the polarized light of the fourth polarization angle penetrates the reflective polarizer, wherein the polarized light of the second polarization angle reflected by the reflective polarizer is linearly polarized light, and the polarized light of the fourth polarization angle penetrated by the reflective polarizer is linearly polarized light.
18. The optical system of claim 1, wherein the polarized light emitted from the display panel is in an unspecified polarization state, a linear polarizer and a first phase retardation element are further disposed between the display panel and the partially reflective partially transmissive element, the linear polarizer is disposed between the display panel and the first phase retardation element, the polarized light provided by the display panel is linearly polarized after passing through the linear polarizer, and the first phase retardation element performs a first phase retardation on the linearly polarized light to obtain a polarized light with a first polarization angle, and converts the polarized light with the first polarization angle into a circularly polarized light.
19. The optical system of claim 1, wherein the optical module is a lens with a flat surface, a spherical surface, an aspherical surface, a Fresnel surface, a free-form or a partially concave convex surface, and is a combination of one or more lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120801551.3U CN216561221U (en) | 2021-04-19 | 2021-04-19 | Optical system of miniaturized head-mounted display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120801551.3U CN216561221U (en) | 2021-04-19 | 2021-04-19 | Optical system of miniaturized head-mounted display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216561221U true CN216561221U (en) | 2022-05-17 |
Family
ID=81537014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120801551.3U Active CN216561221U (en) | 2021-04-19 | 2021-04-19 | Optical system of miniaturized head-mounted display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216561221U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115185086A (en) * | 2022-07-19 | 2022-10-14 | 京东方科技集团股份有限公司 | Display device |
| CN115220224A (en) * | 2021-04-19 | 2022-10-21 | 双莹科技股份有限公司 | Optical system of miniaturized head-mounted display |
-
2021
- 2021-04-19 CN CN202120801551.3U patent/CN216561221U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115220224A (en) * | 2021-04-19 | 2022-10-21 | 双莹科技股份有限公司 | Optical system of miniaturized head-mounted display |
| CN115185086A (en) * | 2022-07-19 | 2022-10-14 | 京东方科技集团股份有限公司 | Display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11460704B2 (en) | Augmented reality apparatus and optical system therefor | |
| CN109946837B (en) | Optical imaging system | |
| WO2022227540A1 (en) | Optical lens set, optical system and head-mounted display apparatus | |
| CN210776039U (en) | Miniaturized short-distance optical system | |
| CN216561221U (en) | Optical system of miniaturized head-mounted display | |
| TWM614817U (en) | Optical system for miniaturized head-mounted display device | |
| TWM596873U (en) | Optical system of miniature head-mounted display | |
| TWI656358B (en) | Optical system of miniaturized head-mounted display | |
| CN111399224A (en) | Display optical system and head-mounted display device | |
| CN113391447A (en) | Optical system of miniature head-mounted display | |
| CN211826725U (en) | Optical system of miniature head-mounted display | |
| CN113805344A (en) | AR glasses | |
| TWM591624U (en) | Short distance optical system | |
| CN117270220B (en) | Optical imaging device and head-mounted display device | |
| TWM564166U (en) | Optical system for miniaturized head-mounted display device | |
| CN210776034U (en) | Short-distance optical system | |
| CN216351551U (en) | AR glasses | |
| CN211603727U (en) | Short-distance optical system | |
| CN115220224A (en) | Optical system of miniaturized head-mounted display | |
| TWI798678B (en) | Optical system of miniaturized head-mounted display | |
| CN112505920A (en) | Miniaturized short-distance optical system | |
| CN113866984B (en) | Short-focus optical module | |
| CN218272936U (en) | Optical module and head-mounted display equipment | |
| CN217846782U (en) | Optical module and head-mounted display equipment | |
| CN215116991U (en) | Augmented reality display system and augmented reality display equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230512 Address after: Room 102, Building 1, No. 8 Shangsha Zhongnan Road, Chang'an Town, Dongguan City, Guangdong Province Patentee after: Dongguan Shuangying Optoelectronic Technology Co.,Ltd. Address before: Taoyuan City, Taiwan, China Patentee before: SHUANGYING TECHNOLOGY Co.,Ltd. |