CN112051672A - Artifact-eliminating display optical machine and method thereof and near-to-eye display equipment - Google Patents
Artifact-eliminating display optical machine and method thereof and near-to-eye display equipment Download PDFInfo
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- CN112051672A CN112051672A CN201910489195.3A CN201910489195A CN112051672A CN 112051672 A CN112051672 A CN 112051672A CN 201910489195 A CN201910489195 A CN 201910489195A CN 112051672 A CN112051672 A CN 112051672A
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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
- G02B27/0101—Head-up displays 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
- G02B27/01—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
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B2027/0178—Eyeglass type
Abstract
The artifact-eliminating display optical machine comprises a display unit for emitting image light, a lens group unit, a perspective reflection unit and a relay system. The relay system comprises a polarization beam splitting element, a polarization conversion element and a polarization filter element. The incident side of the polarization beam splitting element corresponds to the lens group unit, and the reflection side of the polarization beam splitting element corresponds to the perspective reflection unit, wherein the polarization beam splitting element is used for reflecting light rays with a first polarization state in image light rays and transmitting light rays with a second polarization state in the image light rays. The polarization conversion element is arranged between the polarization beam splitting element and the perspective reflection unit and is used for converting the light with the first polarization state passing through twice into the light with the second polarization state. The polarized light filter element is arranged at the transmission side of the polarized light splitting element and is used for absorbing the light with the first polarization state and transmitting the light with the second polarization state.
Description
Technical Field
The invention relates to the technical field of enhanced display, in particular to an artifact-eliminating display optical machine, an artifact-eliminating display optical machine method and near-to-eye display equipment.
Background
Augmented Reality (AR) is also called Augmented Reality or mixed Reality, and is a technology for superimposing a virtual object on a real environment and performing interaction, and an image of the virtual object and an image of the real environment are projected to eyes of a user, so that the user obtains experience of fusion of virtual Reality and Reality. At present, near-eye display equipment capable of realizing augmented reality, such as AR glasses and the like, appears in the market, and a display optical machine serving as a core device of the near-eye display equipment is a key point for realizing augmented reality.
As shown in fig. 1, the conventional display optical device 10P generally includes a display unit 11P, a polarization beam splitter 12P, a curved mirror 13P and an 1/4 wave plate 14P, wherein the polarization beam splitter 12P is located on the light emitting side of the display unit 11P, the curved mirror 13P is located on the reflecting side of the polarization beam splitter 12P, and the 1/4 wave plate 14P is located between the polarization beam splitter 12P and the curved mirror 13P. Thus, when the display unit 11P emits image light, the P-polarized light in the image light passes through the polarization beam splitter 12P and escapes, and the S-polarized light in the image light is reflected to the curved reflector 13P and then reflected back to the polarization beam splitter 12P by the curved reflector 13P, so that the S-polarized light passes through the 1/4 wave plate 14P twice and is converted into P-polarized light, and further passes through the polarization beam splitter 12P to be incident into human eyes. Meanwhile, the ambient light can sequentially pass through the curved reflector 13P, the 1/4 wave plate 14P and the polarization beam splitter 12P to be incident into human eyes, so that the user can obtain an augmented reality experience through the conventional display light machine 10P.
However, for the existing display light machine 10P, the ambient light from below the existing display light machine 10P will reach the polarization beam splitter 12P as interference light, and although P × polarized light in the interference light can transmit through the polarization beam splitter 12P, the polarization beam splitter 12P will reflect S × polarized light in the interference light to human eyes, so that the user will see a virtual image (i.e., an artifact) of an object located below the existing display light machine 10P, causing visual interference, thereby seriously affecting the viewing experience of the user.
Disclosure of Invention
An object of the present invention is to provide an artifact-free display optical engine, a method thereof and a near-eye display device, which can effectively prevent the interference light from being reflected to the eyes of a user, and is helpful to eliminate the artifact interference.
Another object of the present invention is to provide an artifact-free display optical engine, a method thereof and a near-eye display device, wherein in an embodiment of the present invention, a relay system of the artifact-free display optical engine eliminates interference of ambient light below by combining a polarization splitting element and a polarization filtering element, which is helpful to improve a comfortable experience of a user.
Another objective of the present invention is to provide an artifact-free display optical engine, a method thereof and a near-eye display device, wherein in an embodiment of the present invention, the relay system of the artifact-free display optical engine does not reduce the light energy utilization rate of image light while increasing the artifact-free function.
Another object of the present invention is to provide an artifact-free display optical engine, a method thereof and a near-eye display device, wherein in an embodiment of the present invention, the artifact-free display optical engine can reduce leakage of a displayed image, so as to protect privacy of a user.
Another objective of the present invention is to provide an artifact-eliminating display light engine, a method thereof and a near-eye display device, wherein, in an embodiment of the present invention, a predetermined reflection spectrum of a reflection film system of the artifact-eliminating display light engine substantially coincides with a spectrum of image light emitted by the display unit, so as to reduce the escape amount of the image light emitted by the display unit to the maximum extent.
Another objective of the present invention is to provide an artifact-eliminating display optical engine, a method thereof and a near-eye display device, wherein, in an embodiment of the present invention, a protective substrate of the relay system of the artifact-eliminating display optical engine is provided with an antireflection film, so as to protect the linear polarizer and also avoid artifact interference caused by the fact that interfering light is reflected by the protective substrate to the eyes of a user.
It is another object of the present invention to provide an artifact-free display light engine, a method thereof and a near-eye display device, wherein the use of expensive materials or complicated structures is not required in the present invention in order to achieve the above objects. Therefore, the present invention successfully and effectively provides a solution, not only providing an artifact-eliminating display optical engine and method thereof and a near-eye display device, but also increasing the practicability and reliability of the artifact-eliminating display optical engine and method thereof and the near-eye display device.
To achieve at least one of the above objects or other objects and advantages, the present invention provides an artifact-free display light engine, comprising:
a display unit for emitting image light;
a lens group unit for modulating the image light emitted by the display unit;
a perspective reflection unit; and
a relay system, wherein the relay system comprises:
a polarization beam splitting element, wherein the incident side of the polarization beam splitting element corresponds to the lens group unit, and the reflection side of the polarization beam splitting element corresponds to the perspective reflection unit, wherein the polarization beam splitting element is used for reflecting the modulated light with the first polarization state in the image light, and transmitting the modulated light with the second polarization state in the image light;
a polarization conversion element, wherein the polarization conversion element is disposed between the polarization beam splitter element and the perspective reflection unit, wherein the perspective reflection unit is configured to reflect the light with the first polarization state reflected by the polarization beam splitter element back to the polarization beam splitter element to pass through the polarization conversion element twice, and wherein the polarization conversion element is configured to convert the light with the first polarization state passing through twice into the light with the second polarization state; and
the polarized light filtering element is arranged on the transmission side of the polarized light splitting element and used for absorbing the light with the first polarization state and transmitting the light with the second polarization state, so that the light with the first polarization state in the interference light can be absorbed by the polarized light filtering element, and the light with the second polarization state in the interference light can sequentially penetrate through the polarized light filtering element and the polarized light splitting element.
In an embodiment of the invention, the polarization filter element is a linear polarizer.
In an embodiment of the present invention, the polarization splitting element includes a transparent substrate and a polarization splitting film, wherein the polarization splitting film is disposed on an upper surface of the transparent substrate, and the polarization splitting film is located between the transparent substrate and the lens group unit.
In an embodiment of the invention, the polarization conversion element is an 1/4 wave plate.
In an embodiment of the present invention, the see-through reflection unit includes a curved substrate and a partially reflective film, wherein the partially reflective film is disposed on an inner surface of the curved substrate, and the partially reflective film is located between the curved substrate and the polarization conversion element.
In an embodiment of the invention, the relay system further includes a protective substrate, wherein the protective substrate is located outside the polarized light filtering element, so that the polarized light filtering element is located between the protective substrate and the polarization splitting element.
In an embodiment of the invention, the relay system further includes an antireflection film, wherein the antireflection film is disposed on an outer surface of the protection substrate.
In an embodiment of the present invention, the lens group unit includes at least one lens, wherein each lens has one of a standard spherical surface, an aspherical surface, a free-form surface and a diffractive surface.
In an embodiment of the present invention, the display unit is one of a LCD type, an OLED type, a DLP type, and an LCOS type micro display device.
According to another aspect of the present invention, the present invention further provides a near-eye display device comprising:
an apparatus main body; and
at least one artifact-free display optical machine as described in any one of the above, wherein the artifact-free display optical machine is disposed in the device main body to assemble a near-eye display device with an artifact-free function.
According to another aspect of the present invention, the present invention further provides a method for manufacturing an artifact-free display light engine, comprising the steps of:
respectively arranging a polarization conversion element and a polarization filter element on the reflection side and the transmission side of a polarization beam splitting element to form a relay system, wherein the polarization beam splitting element is used for reflecting light with a first polarization state and transmitting light with a second polarization state, and the polarization filter element is used for absorbing the light with the first polarization state and transmitting the light with the second polarization state;
sequentially arranging a display unit and a lens assembly unit on the incident side of the polarized light conversion element of the relay system so that the lens assembly unit is positioned between the display unit and the polarized light conversion element; and
and arranging a perspective reflection unit at the reflection side of the polarized light conversion element of the relay system, and enabling the polarized light conversion element to be positioned between the polarization beam splitting element and the perspective reflection unit so as to form the artifact-eliminating display light machine.
In an embodiment of the present invention, the method for manufacturing the artifact-free display optical engine further includes:
arranging a protective substrate on the outer side of the polarization filter element so that the polarization filter element is positioned between the protective substrate and the polarization beam splitting element; and
and arranging an antireflection film on the outer side surface of the protective substrate so that the protective substrate is positioned between the antireflection film and the polarized light filtering element.
According to another aspect of the present invention, the present invention further provides an artifact removing method for an artifact removing display light engine, comprising the steps of:
absorbing the light with the first polarization state in the interference light by a polarized light filter element of the artifact eliminating display light machine, and transmitting the light with the second polarization state in the interference light; and
the light with the second polarization state in the interference light transmitted by the polarization filter element is transmitted by a polarization beam splitter element at the transmission side of the polarization filter element, so that the artifact generated by the interference light reflected to the eyes of the user is eliminated.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.
Drawings
Fig. 1 shows a schematic structural diagram of a conventional display light machine.
Fig. 2 is a schematic structural diagram of an artifact-free display optical engine according to an embodiment of the present invention.
Fig. 3 is a partially enlarged schematic view of the relay system of the deghost display optical machine according to the above embodiment of the present invention.
Fig. 4 is an exploded view of the relay system of the deghost display light engine according to the above embodiment of the present invention.
Fig. 5 shows a variant of the deghost display light engine according to the above-described embodiment of the invention.
Fig. 6 illustrates one example of a near-eye display device according to an embodiment of the present invention.
Fig. 7 is a flowchart illustrating a method for manufacturing a deghost display light engine according to an embodiment of the invention.
Fig. 8 is a flowchart illustrating an artifact removing method for an artifact removing display optical engine according to an embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
In the present invention, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element may be one in number in one embodiment, and the element may be more than one in number in another embodiment. The terms "a" and "an" should not be construed as limiting the number unless the number of such elements is explicitly recited as one in the present disclosure, but rather the terms "a" and "an" should not be construed as being limited to only one of the number.
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate. 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 the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In recent years, with the rapid development of augmented reality technology, near-eye display devices capable of realizing augmented reality are becoming more popular and used by people. But be subject to the restriction that shows ray apparatus self structure among the present near-to-eye display device, this present environmental light that shows ray apparatus below (hereinafter for short disturb light) will inevitably be reflected to user's eye in, lead to the user when watching the scenery that shows ray apparatus the place ahead, also can see the virtual image (being the artifact) that shows ray apparatus below object to cause the vision to disturb, influence user's visual experience.
In order to solve the above problem, referring to fig. 2 to 4, an embodiment of the present invention provides an artifact-free display optical engine, which can effectively prevent the lower interference light from being reflected to the eyes of the user to prevent the occurrence of artifact interference. Specifically, as shown in fig. 2, the display optical machine 10 includes a display unit 11, a relay system 12, a perspective reflection unit 13, and a lens assembly unit 14. The display unit 11 is used for emitting image light. The lens group unit 14 is disposed between the display unit 11 and the relay system 12, and modulates image light emitted through the display unit 11. The relay system 12 is configured to transmit the image light modulated by the lens group unit 14 to the perspective reflection unit 13. The perspective reflection unit 13 is configured to reflect the image light transmitted by the relay system 12 back to the relay system 12, and allow the ambient light to pass through the perspective reflection unit 13 to enter the relay system 12, so that the image light and the ambient light can pass through the relay system 12 to enter the eyes of the user, so that the user can view the image to be displayed and the real environment at the same time, thereby achieving the purpose of augmented reality.
More specifically, as shown in fig. 2 and fig. 3, the relay system 12 of the display light engine 10 includes a polarization splitting element 121, a polarization conversion element 122 and a polarization filter element 123, wherein the polarization splitting element 121 is configured to reflect light having a first polarization state and transmit light having a second polarization state, and a polarization direction of the light having the first polarization state is perpendicular to a polarization direction of the light having the second polarization state; wherein the polarization conversion element 122 is used for converting the twice-passed light with the first polarization state into the light with the second polarization state; wherein the polarization filter element 123 is used for absorbing the light with the first polarization state and transmitting the light with the second polarization state. It is understood that, in the above embodiments of the present invention, the light having the first polarization state may be implemented as, but not limited to, polarized light having an S polarization state (S polarized light for short); accordingly, the light having the second polarization state may be, but is not limited to, implemented as polarized light having a P polarization state (P polarized light for short).
Specifically, as shown in fig. 2, the polarization beam splitter 121 and the polarization filter 123 are sequentially disposed along the emission path of the display unit 11 from top to bottom, and the display unit 11 is located above the polarization beam splitter 121, so that the light having the second polarization state in the image light emitted through the display unit 11 firstly passes through the polarization beam splitter 121 and then passes through the polarization filter 122. Meanwhile, as shown in fig. 2 and fig. 3, the disturbing light from the lower side of the deghost display optical machine 10 is filtered by the polarization filter 122 and then transmitted to the polarization beam splitter 121. Such that the light of the disturbing light having the first polarization state will be absorbed by the polarization filter element 122 and will not be reflected by the polarization splitting element 121 to the user's eye; although the light with the second polarization state in the disturbing light can pass through the polarized light filtering element 122 to propagate to the polarized light splitting element 121, the light with the first polarization state and the second polarization state in the disturbing light can pass through the polarized light splitting element 121 without being reflected by the polarized light splitting element 121, so that none of the disturbing light with the first polarization state and the second polarization state is reflected to the eyes of the user, and the artifact interference caused by the disturbing light from the lower side of the artifact removing type display light machine 10 is eliminated, so that the artifact removing type display light machine 10 has an artifact removing function, and the use experience of the user is improved. It will be appreciated that, illustratively, the image light and the disturbing light are both generally unpolarized light, that is, the image light and the disturbing light include both P-polarized light and S-polarized light. It should be noted that, in order to distinguish the image light from the interference light in the figure, P-polarized light in the interference light is denoted as P-polarized light, and S-polarized light in the interference light is denoted as S-polarized light.
In addition, as shown in fig. 2, the polarization conversion element 122 is disposed between the polarization splitting element 121 and the perspective reflection unit 13, such that light having a first polarization state in the image light emitted by the display unit 11 is first reflected by the polarization splitting element 121, passes through the polarization conversion element 122 for the first time to reach the perspective reflection unit 13, and is then reflected by the perspective reflection unit 13, passes through the polarization conversion element 122 for the second time to reach the polarization splitting element 121, so that the light having the first polarization state in the image light passes through the polarization conversion element 122 twice to be converted into light having a second polarization state, and then passes through the polarization splitting element 121 to be incident on the eyes of the user, thereby obtaining a good augmented reality experience for the user.
In other words, the polarization beam splitter 121 of the relay system 12 has an incident side, a reflective side and a transmissive side, wherein the display unit 11 corresponds to the incident side of the polarization beam splitter 121; the polarization conversion element 122 corresponds to the reflection side of the polarization splitting element 121; the polarization filter element 123 corresponds to the transmission side of the polarization splitting element 121. The light having the first polarization state among the image light thus emitted via the display unit 11 is reflected by the polarization splitting element 121 to propagate to the polarization conversion element 122 toward the reflection side of the polarization splitting element 121; the light having the second polarization state among the image light emitted through the display unit 11 is transmitted by the polarization splitting element 121 to propagate toward the transmission side of the polarization splitting element 121 to the polarization filter element 123. At the same time, the ambient light (i.e. the interference light) from the transmission side of the polarization splitting element 121 will be filtered by the polarization filter element 123 to absorb the light with the first polarization state of the interference light and allow the light with the second polarization state of the interference light to pass through; then, the light with the second polarization state in the disturbing light also passes through the polarization beam splitter 121 and escapes, and is not reflected to the eyes of the user, so as to eliminate the artifact interference caused by the disturbing light, which is helpful to improve the user experience. It is understood that in the relay system 12, the polarization beam splitter 121 is also located at the transmission side of the polarization filter 123, so that the light with the second polarization state in the disturbing light can also transmit through the polarization beam splitter 121 after transmitting through the polarization filter 123, so as to eliminate artifacts caused by the disturbing light being reflected to the eyes of the user.
It should be noted that, in the embodiment of the present invention, as shown in fig. 2 and fig. 3, the polarization beam splitting element 121 of the relay system 12 may be implemented, but not limited to, as including a transparent substrate 1211 and a polarization beam splitting film 1212, wherein the polarization beam splitting film 1212 is disposed on the upper surface of the transparent substrate 1211, so that the polarization beam splitting film 1212 is located between the transparent substrate 1211 and the lens assembly unit 14, so that the polarization beam splitting element 121 is implemented as a polarization beam splitter for reflecting light having a first polarization state in the image light emitted through the display unit 11 and allowing light having a second polarization state in the image light to pass through. It is understood that the polarization splitting film 1212 may be, but is not limited to, attached or plated on the upper surface of the light-transmissive substrate 1211. In addition, the light-transmissive substrate 1211 may be made of, but not limited to, a light-transmissive material such as optical plastic or optical glass, etc., to ensure that light can be transmitted through the light-transmissive substrate 1211.
In the above embodiment of the present invention, as shown in fig. 2, the perspective reflection unit 13 may include, but is not limited to, a curved substrate 131 and a partial reflection film 132, wherein the partial reflection film 132 is disposed on an inner surface of the curved substrate 131, so that the partial reflection film 132 is located between the relay system 12 and the curved substrate 131, and is configured to reflect at least a part of the light having the first polarization state reflected by the polarization beam splitter 121 back to the polarization beam splitter 121, so that the light having the first polarization state passes through the polarization conversion element 122 twice to be converted into the light having the second polarization state, and then passes through the polarization beam splitter 121 to be incident on the eye of the user. It is understood that the partially reflective film 132 may be, but not limited to, attached or plated on the inner surface of the curved substrate 131, and may also be disposed on the outer surface of the curved substrate 131. In addition, the curved substrate 131 may be made of a light-transmitting material such as optical plastic or optical glass, etc. to ensure that ambient light can transmit through the see-through reflection unit 13.
It is noted that in the above embodiments of the present invention, the partially reflective film 132 may be, but is not limited to being, implemented as a semi-reflective semi-permeable film. Of course, in other examples of the present invention, the partial reflection film 132 may also be implemented as a reflection film system having a predetermined reflection spectrum, where the predetermined reflection spectrum of the reflection film system is consistent with the spectrum of the image light emitted by the display unit 11, so as to reflect all the light reflected by the polarization beam splitting element 121 back to the polarization beam splitting element 121, and simultaneously allow the portion with inconsistent spectrum in the ambient light to pass through the reflection film system to be incident on the eyes of the user, so as to ensure that the artifact-free display optical engine 10 can prevent the image leakage, improve the light energy utilization rate of the system, improve the image contrast, and have an excellent augmented reality effect on the basis of eliminating the lower reflection artifact.
According to the above-mentioned embodiment of the present invention, as shown in fig. 2, the polarization conversion element 122 can be, but is not limited to be, implemented as an 1/4 wave plate 1221 for converting the light having the first or second polarization state passing through the 1/4 wave plate 1221 twice into the light having the second or first polarization state. In other words, the first 1/4 wave plate 1221 is disposed between the polarization beam splitter 121 and the see-through reflection unit 13, so that the light with the first polarization state reflected by the polarization beam splitter 121 in the image light firstly passes through the first 1/4 wave plate 1221 for the first time to be converted into the first circularly polarized light, and after being reflected by the see-through reflection unit 13 for the second circularly polarized light, the light with the first polarization state passes through the first 1/4 wave plate 1221 for the second time to be converted into the light with the second polarization state, so that the light with the first polarization state is converted into the light with the second polarization state after passing through the 1/4 wave plate 1221 twice, and most of the reflected image light can pass through the polarization beam splitter 121. In particular, the light having the second polarization state transmitted through the polarization beam splitter 121 can also transmit through the polarization filter 123 to be incident on the eyes of the user, and the energy of the light having the second polarization state is not lost due to the polarization filter 123, which helps to ensure that the artifact-free display light engine 10 has a high light energy utilization rate for image light.
In the above embodiment of the present invention, as shown in fig. 2, the lens assembly unit 14 of the deghost optical machine 10 may include, but is not limited to, at least one lens 141, wherein the surface shape of each lens 141 may be, but is not limited to, implemented as, for example, a standard spherical surface, an aspherical surface, a free-form surface or a diffractive surface, and is used for modulating and shaping the image light from the display unit 11. In other words, the surface type of the at least one lens 141 may be, but is not limited to, one or more selected from the group consisting of a standard spherical surface, an aspherical surface, a free-form surface, and a diffractive surface. It is understood that the free-form surface mentioned in the present invention may be, but is not limited to, a surface type implemented as an XY polynomial free-form surface, a Zernike polynomial free-form surface, or a toric surface, etc.
Further, in the above-described embodiment of the present invention, the display unit 11 may be, but is not limited to be, implemented as one of LCD, OLED, DLP, LCOS type micro display devices for providing the image light. In particular, when the display unit 11 is implemented as an LCOS type micro display device, the LCOS type micro display device can emit image light with a first polarization state so as to cooperate with the polarization beam splitter 121, so that the image light emitted by the display unit 11 is not lost at the polarization beam splitter 121, which is helpful to further improve the light energy utilization rate of the near-eye display light engine 10 for the image light.
It is worth mentioning that in this embodiment of the present invention, as shown in fig. 3 and 4, the polarized light filtering element 123 of the relay system 12 may be, but is not limited to be, implemented as a linear polarizer 1231 for allowing only the light with the second polarization state to pass through and absorbing the light with the first polarization state. Illustratively, as shown in fig. 2 and 3, the linear polarizer 1231 of the polarization filter element 123 is implemented as a P-polarizer for allowing only P-polarized light to pass therethrough and absorbing S-polarized light so as to match the polarization splitting film 1212 (e.g., PBS film, reflecting S-polarized light, and transmitting P-polarized light) of the polarization splitting element 121.
Further, as shown in fig. 2 and 3, the relay system 12 may further include a protective substrate 124, wherein the protective substrate 124 is located outside the polarized light filtering element 123, so that the polarized light filtering element 123 is located between the protective substrate 124 and the polarization splitting element 121, so as to protect and support the polarized light filtering element 123 through the protective substrate 124. It is understood that the protective substrate 124 may be made of, but not limited to, a light-transmitting material such as glass, transparent plastic, etc. to allow light to transmit through the protective substrate 124.
Preferably, as shown in fig. 2 and 3, the relay system 12 may further include an antireflection film 125, wherein the antireflection film 125 is disposed on the outer surface of the protection substrate 124, and is used for reducing reflection of the interference light on the outer surface of the protection substrate 124, which helps to avoid causing visual interference. It is understood that the antireflection film 125 may be, but is not limited to, plated on the outer surface of the protective substrate 124. For example, in other examples of the present invention, the antireflection film 125 may also be directly attached to the outer surface of the protective substrate 124.
It should be noted that, as shown in fig. 2, in the deghost display optical engine 10 according to the above embodiment of the present invention, the display optical axis 110 of the display unit 11 is generally perpendicular to the optical viewing axis 100 of the deghost display optical engine 10, that is, an angle θ between the display optical axis 110 of the display unit 11 and the optical viewing axis 100 of the deghost display optical engine 10 is 90 °, that is, an angle between the polarization beam splitter 121 of the relay system 12 and the optical viewing axis 100 (in the horizontal direction in fig. 2) is generally 45 °. It is understood that a normal to a display surface of the display unit 11 may be defined as the display optical axis 110 of the display unit 11; the optical viewing axis 100 of the deghost display light engine 10 can be implemented as a main viewing axis defined by the polarization splitting element 121 and the polarization conversion element 122 of the relay system 12, and the see-through reflection unit 13, so that a user can see both a virtual image displayed via the display unit 11 and a real image of an external environment along the optical viewing axis 100 to obtain a virtual-real fused augmented reality experience. It is understood that the perspective reflection unit 13 can be optimally adjusted according to the specific system design.
However, since the included angle between the polarization beam splitting unit 12 and the optical viewing axis 100 is equal to 45 °, the eye-relief (i.e. the eye-point distance, such as the distance from the lens to the forehead) of the deghost display optical machine 10 is small, which is not favorable for the near-sighted or far-sighted users to add the adapter, resulting in poor wearing experience and comfort for the users. In addition, this configuration is not favorable for design adjustment of the whole system to make the deghost display optical engine 10 compact, and cannot meet the current trend of miniaturization and lightness.
Fig. 5 shows a variant of the deghost display light engine 10 according to the above-described embodiment of the invention. Compared to the above-described embodiment according to the present invention, the deghost display light engine 10 according to the variant embodiment of the present invention is different in that: an included angle θ between the display optical axis 110 of the display unit 11 and the optical viewing axis 100 is smaller than 90 °, that is, an included angle between the polarization beam splitter 121 of the relay system 12 and the optical viewing axis 100 is larger than 45 °, so that an eye-point distance of the artifact-free display optical machine 10 is increased, an adapter is added for a user with myopia or hyperopia, and the wearing experience and comfort of the user are improved.
Preferably, the angle θ between the display optical axis 110 of the display unit 11 and the optical viewing axis 100 is between 40 ° and 80 °, i.e. 40 ° ≦ θ ≦ 80 °. Thus, the configuration of the deghost display light engine 10 is advantageous for making the deghost display light engine 10 compact by design adjustment of the whole system, so as to meet the current trend of miniaturization, lightness and thinness.
According to another aspect of the present invention, as shown in fig. 6, the present invention further provides a near-eye display device 1 configured with an artifact-removing display light engine 10 to remove an artifact caused by an interference light from below the near-eye display device 1, so as to avoid visual interference to a user, and to help improve the user experience. For example, as shown in fig. 6, the near-eye display device 1 may include at least one artifact-removing display light engine 10 and a device main body 20, wherein the artifact-removing display light engine 10 is disposed on the device main body 20, so that the near-eye display device 1 has a function of removing artifact interference. In other words, when the user wears the near-eye display device 1 for an augmented reality experience, the disturbing light from below the near-eye display device 1 will not be reflected by the artifact-removing display light machine 10 of the near-eye display device 1 to the user's eyes to prevent the user from viewing the image below the near-eye display device 1, thereby effectively eliminating the visual disturbance.
It is noted that the device body 20 may be implemented as, but not limited to, a glasses body, so that the near-eye display device 1 is implemented as AR glasses with artifact interference elimination function, which helps to improve the user experience. It will be appreciated that in other examples of the invention, the near-eye display device 1 may also be implemented as other types of AR devices, such as an AR helmet or the like.
According to another aspect of the present invention, the present invention further provides a method for manufacturing a display light engine. Specifically, as shown in fig. 7, the method for manufacturing the artifact-free display optical engine 10 includes the steps of:
s310: disposing a polarization conversion element 122 and a polarization filter element 123 on the reflective side and the transmissive side of a polarization splitting element 121, respectively, to form a relay system 12, wherein the polarization splitting element 121 is configured to reflect light having a first polarization state and transmit light having a second polarization state, and the polarization filter element 123 is configured to absorb the light having the first polarization state and transmit the light having the second polarization state;
s320: disposing a display unit 11 and a lens assembly unit 14 in this order on the incident side of the polarization conversion element 122 of the relay system 12 such that the lens assembly unit 14 is located between the display unit 11 and the polarization conversion element 121; and
s330: a perspective reflection unit 13 is disposed on the reflection side of the polarization conversion element 122 of the relay system 12, and the polarization conversion element 122 is located between the polarization beam splitter 121 and the perspective reflection unit 13, so as to form the artifact-free display optical engine 10.
It is noted that in one example of the present invention, the polarization beam splitter 121 is implemented as a polarization beam splitter.
In one example of the present invention, the polarization conversion element 122 is implemented as an 1/4 wave plate 1221.
In one example of the present invention, the polarized filter element 123 may be implemented as a P-polarizer 1231.
Further, in the above embodiment of the present invention, as shown in fig. 7, the method for manufacturing the artifact-free display optical engine 10 may further include the steps of:
s340: disposing a protective substrate 124 outside the polarization filter element 123, so that the polarization filter element 123 is located between the protective substrate 124 and the polarization beam splitter 121; and
s350: an antireflection film 125 is disposed on the outer side surface of the protection substrate 124, so that the protection substrate 124 is located between the antireflection film 125 and the polarization filter element 123.
According to another aspect of the invention, the invention further provides an artifact eliminating method for the artifact eliminating type display optical machine. Specifically, as shown in fig. 8, the artifact removing method for an artifact removing display light engine includes the steps of:
s410: absorbing the light with the first polarization state in the interference light by a polarized light filter element 123, and transmitting the light with the second polarization state in the interference light; and
s420: the light with the second polarization state of the disturbing light transmitted through the polarization filter element 123 is transmitted by a polarization beam splitter element 121 at the transmission side of the polarization filter element 123, so as to eliminate artifacts generated by the disturbing light being reflected to the eyes of the user.
It is noted that in one example of the present invention, the polarization beam splitter 121 is implemented as a polarization beam splitter.
In one example of the present invention, the polarization filter element 123 may be implemented as a linear polarizer.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (13)
1. An artifact-free display light engine, comprising:
a display unit for emitting image light;
a lens group unit for modulating the image light emitted by the display unit;
a perspective reflection unit; and
a relay system, wherein the relay system comprises:
a polarization beam splitting element, wherein the incident side of the polarization beam splitting element corresponds to the lens group unit, and the reflection side of the polarization beam splitting element corresponds to the perspective reflection unit, wherein the polarization beam splitting element is used for reflecting the modulated light with the first polarization state in the image light, and transmitting the modulated light with the second polarization state in the image light;
a polarization conversion element, wherein the polarization conversion element is disposed between the polarization beam splitter element and the perspective reflection unit, wherein the perspective reflection unit is configured to reflect the light with the first polarization state reflected by the polarization beam splitter element back to the polarization beam splitter element to pass through the polarization conversion element twice, and wherein the polarization conversion element is configured to convert the light with the first polarization state passing through twice into the light with the second polarization state; and
the polarized light filtering element is arranged on the transmission side of the polarized light splitting element and used for absorbing the light with the first polarization state and transmitting the light with the second polarization state, so that the light with the first polarization state in the interference light can be absorbed by the polarized light filtering element, and the light with the second polarization state in the interference light can sequentially penetrate through the polarized light filtering element and the polarized light splitting element.
2. The deghost display light engine of claim 1, wherein the polarizing filter element is a linear polarizer.
3. The deghost display light engine of claim 2, wherein the polarization beam splitting element comprises a transparent substrate and a polarization beam splitting film, wherein the polarization beam splitting film is disposed on an upper surface of the transparent substrate, and the polarization beam splitting film is disposed between the transparent substrate and the lens assembly unit.
4. The deghost display light engine of claim 3, wherein the polarization conversion element is an 1/4 wave plate.
5. The deghost display optical bench of claim 4, wherein the see-through reflection unit comprises a curved substrate and a partially reflective film, wherein the partially reflective film is disposed on an inner surface of the curved substrate, and the partially reflective film is located between the curved substrate and the polarization conversion element.
6. The deghost display light engine of any of claims 1 to 5, wherein the relay system further comprises a protective substrate, wherein the protective substrate is positioned outside the polarizing filter element such that the polarizing filter element is between the protective substrate and the polarizing beam splitting element.
7. The deghost display light engine of claim 6, wherein the relay system further comprises an anti-reflective coating, wherein the anti-reflective coating is disposed on an outer surface of the protective substrate.
8. The deghost display light engine of any one of claims 1 to 5, wherein the lens assembly unit comprises at least one lens, wherein each lens has one of a standard spherical surface, an aspherical surface, a free-form surface and a diffractive surface.
9. The deghost display light engine as recited in any of claims 1 to 5, wherein the display unit is one of an LCD type, an OLED type, a DLP type and an LCOS type micro display device.
10. A near-eye display device, comprising:
an apparatus main body; and
the artifact-free display engine of any one of claims 1 to 9, wherein the artifact-free display engine is disposed in the device body to assemble a near-eye display device with artifact-free functionality.
11. A manufacturing method of artifact-free display optical machine is characterized by comprising the following steps:
respectively arranging a polarization conversion element and a polarization filter element on the reflection side and the transmission side of a polarization beam splitting element to form a relay system, wherein the polarization beam splitting element is used for reflecting light with a first polarization state and transmitting light with a second polarization state, and the polarization filter element is used for absorbing the light with the first polarization state and transmitting the light with the second polarization state;
sequentially arranging a display unit and a lens assembly unit on the incident side of the polarized light conversion element of the relay system so that the lens assembly unit is positioned between the display unit and the polarized light conversion element; and
and arranging a perspective reflection unit at the reflection side of the polarized light conversion element of the relay system, and enabling the polarized light conversion element to be positioned between the polarization beam splitting element and the perspective reflection unit so as to form the artifact-eliminating display light machine.
12. The method of manufacturing a deghost display light engine as recited in claim 11, further comprising the steps of:
arranging a protective substrate on the outer side of the polarization filter element so that the polarization filter element is positioned between the protective substrate and the polarization beam splitting element; and
and arranging an antireflection film on the outer side surface of the protective substrate so that the protective substrate is positioned between the antireflection film and the polarized light filtering element.
13. An artifact removing method for an artifact removing display optical machine, comprising the steps of:
absorbing the light with the first polarization state in the interference light by a polarized light filter element of the artifact eliminating display light machine, and transmitting the light with the second polarization state in the interference light; and
the light with the second polarization state in the interference light transmitted by the polarization filter element is transmitted by a polarization beam splitter element at the transmission side of the polarization filter element, so that the artifact generated by the interference light reflected to the eyes of the user is eliminated.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910489195.3A CN112051672A (en) | 2019-06-06 | 2019-06-06 | Artifact-eliminating display optical machine and method thereof and near-to-eye display equipment |
| PCT/CN2019/114928 WO2020119320A1 (en) | 2018-12-13 | 2019-11-01 | Display light machine, method thereof, and near-eye display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910489195.3A CN112051672A (en) | 2019-06-06 | 2019-06-06 | Artifact-eliminating display optical machine and method thereof and near-to-eye display equipment |
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| CN112051672A true CN112051672A (en) | 2020-12-08 |
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