CN213600993U - Multi-focal plane display system - Google Patents
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- CN213600993U CN213600993U CN202022635413.0U CN202022635413U CN213600993U CN 213600993 U CN213600993 U CN 213600993U CN 202022635413 U CN202022635413 U CN 202022635413U CN 213600993 U CN213600993 U CN 213600993U
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Abstract
A multi-focal-plane display system includes a display unit, a light conversion unit, a partially transmissive partially reflective member, a polarizing unit, and a lens unit. The display unit is used for emitting light carrying image information. The light conversion unit is used for converting the light emitted by the display unit into circularly polarized light or elliptically polarized light. The partially transmissive partially reflective member is for transmitting or reflecting circularly polarized light or elliptically polarized light. The polarization unit includes a first phase retarder and a first polarizer. The first phase retarder is for converting circularly polarized light or elliptically polarized light transmitted by the partially transmissive partially reflective member into first linearly polarized light. The first polarizer is used for reflecting the first linearly polarized light and transmitting a second linearly polarized light vertical to the polarization direction of the first linearly polarized light. The multi-focal plane display system can generate image information with depth to relieve visual fatigue, dizziness, eye strain, nausea and the like caused by the visual convergence conflict.
Description
Technical Field
The utility model relates to the field of optical technology, especially, relate to a display system of many focal planes.
Background
Virtual Reality (VR) is a technology for generating a simulation environment by using a computer and giving a user a sense of realism of being personally on the scene through an immersive visual, auditory, and other sensory device. The conventional VR device optical module is generally large in size, the thickness of the conventional VR device optical module is often more than 30mm, and as technology advances, users pay more and more attention to the size and weight of VR products, so that many companies have introduced VR glasses based on the pancake technology, and the optical module mainly includes a lens with a semi-reflective and semi-transparent function, an 1/4 phase retarder and a reflective polarizer, which are sequentially disposed. After an image source enters the semi-reflecting and semi-transmitting lens, light rays are reflected back for many times among the lens, the phase delay plate and the reflective polarizing plate and finally emitted out of the reflective polarizing plate. Through the optical scheme, the product volume is greatly reduced.
Since more than 80% of the information obtained by humans from the objective world comes from vision, how to build an immersive visual experience is one of the most important issues for VR systems. Existing VR devices achieve a better immersive experience by presenting a stereoscopic display with binocular disparity, where vergence-accommodation convergence (VAC) is a technical problem that severely impacts the user experience. The convergence of vision adjustment conflict between the convergence of the human eyes (Vergence) and the distance information of the observed object reflected by the Accommodation of the crystalline lens (Accommodation). Convergence refers to the convergence degree of the eyeballs of both eyes when the human eyes observe the target object; the accommodation means that the human eye adjusts the focal length of the crystalline lens according to the depth of a target object, so that an image of a viewed object can be clearly presented on a retina. When the human eyes observe the real world, convergence and adjustment are mutually cooperated, so that the object is clearly imaged; in the existing VR device, the stereoscopic display presented by the binocular parallax does not have real depth information, the focus adjustment of human eyes is not matched with the depth sense, and the binocular convergence still truly reflects the distance information of the virtual target, so that the visual convergence adjustment conflict is generated, and due to the incompatibility of human eyes in physiological aspects, serious visual fatigue is inevitably caused after a period of time, and even phenomena of dizziness, eye distension, nausea and the like of different degrees occur. Alleviating the convergence of vision conflict is a problem that must be solved on the way VR devices develop.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a many focal planes display system to the image information that the production has the degree of depth, thereby alleviate visual fatigue, dizziness, eye distension, phenomenons such as nausea that visual convergence conflict brought.
In order to achieve the above object, an embodiment of the present invention provides a multi-focal plane display system, which includes according to the order: a display unit, a light conversion unit, a partially transmissive partially reflective member, and a polarization unit;
the display unit is used for emitting light carrying image information; the light conversion unit is used for converting the light emitted by the display unit into circularly polarized light or elliptically polarized light; the partial transmission and partial reflection component is used for transmitting or reflecting the circularly polarized light or the elliptically polarized light; the polarization unit comprises a first phase delay piece and a first polarization piece, wherein the first phase delay piece is used for converting circularly polarized light or elliptically polarized light transmitted by the partial transmission partial reflection component into first linearly polarized light, and the first polarization piece is used for reflecting the first linearly polarized light and transmitting second linearly polarized light vertical to the polarization direction of the first linearly polarized light;
the display system further includes:
and a lens unit located on the same side as the light conversion unit, the partially transmissive and partially reflective member, and the polarization unit.
Optionally, the light conversion unit includes a second polarizer and a second phase retardation element, which are sequentially disposed, the second polarizer is configured to convert light emitted by the display unit into linearly polarized light, and the second phase retardation element is configured to convert the linearly polarized light generated by the second polarizer into circularly polarized light or elliptically polarized light.
Optionally, the lens unit includes a zoom lens, the zoom lens includes a first lens and a second lens, the first lens and the second lens are movable in a direction perpendicular to an optical axis of the zoom lens to change a focal length of the zoom lens, and the first lens is disposed on a side close to the display unit.
Optionally, the zoom lens further comprises a driving unit for driving the first lens and the second lens to move in a direction perpendicular to the optical axis.
Optionally, the zoom lens is disposed between the partially transmissive partially reflective element and the polarizing unit.
Optionally, the partially transmissive partially reflective element is disposed on a surface of the first optic proximate to the display unit.
Optionally, the zoom lens is disposed between the light ray conversion unit and the partially transmissive partially reflective element.
Optionally, the partially transmissive partially reflective element is disposed on a surface of the second optic remote from the display unit.
Optionally, the zoom lens is disposed on a side of the polarization unit away from the display unit.
Optionally, the zoom lens is disposed between the display unit and the light ray conversion unit.
Optionally, the lens unit further comprises: an auxiliary lens, the zoom lens being disposed between the display unit and the light ray conversion unit, the auxiliary lens being disposed between the light ray conversion unit and the polarization unit, the partially transmissive partially reflective member being disposed on the auxiliary lens.
The embodiment of the utility model provides an among the many focal planes display system, through setting up partial transmission partial reflection part and polarization unit, because polarization unit includes first phase delay spare and first polarization piece. After light emitted from the display unit passes through the partial transmission partial reflection component, the light is folded back among the partial transmission partial reflection component, the first phase delay piece and the first polarizer, and finally the light is emitted to human eyes from the first polarizer. The zoom lens can generate a plurality of focal planes to adapt to the watching direction of human eyes, so that the phenomena of visual fatigue and the like caused by the visual convergence conflict are relieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a block diagram of a multi-focal plane display system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the optical path of the multi-focal-plane display system of fig. 1.
Fig. 3 is a schematic diagram of an optical path of a multi-focal-plane display system according to another embodiment of the present invention.
Fig. 4 is a schematic diagram of an optical path of a multi-focal-plane display system according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein, and that the terms "comprises" and "comprising," and any variations thereof, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a multi-focal plane display system 100, which includes, in order: a display unit 110, a light conversion unit 120, a partially transmissive partially reflective member 130, a polarization unit 140, and a lens unit 400.
The display unit 110 is configured to emit light carrying image information. The light conversion unit 120 is configured to convert light emitted from the display unit 110 into circularly polarized light or elliptically polarized light. The partially transmissive partially reflective member 130 for transmitting or reflecting the circularly polarized light or the elliptically polarized light. The polarization unit 140 includes a first phase retarder 141 and a first polarizer 142. The first phase retarder 141 is used to convert circularly polarized light or elliptically polarized light transmitted by the partially transmissive partially reflective member 130 into first linearly polarized light. The first polarizer 142 is configured to reflect the first linearly polarized light and transmit a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light.
The lens unit 400 is located on the same side of the display unit 110 as the light conversion unit 120, the partially transmissive partially reflective member 130, and the polarization unit 140.
The light conversion unit 120 includes a second polarizer 121 and a second phase retardation element 122 sequentially disposed. The second polarizer 121 is used for converting the light emitted from the display unit 110 into linearly polarized light. The second phase delay element 122 is configured to convert the linearly polarized light generated by the second polarizer 121 into circularly polarized light or elliptically polarized light. In this embodiment, the second polarizer 121 is a polarizer for converting the light emitted from the display unit 110 into linearly polarized light. The second phase retarder 122 is a quarter-wave plate for converting linearly polarized light after passing through the second polarizer 121 into circularly polarized light or elliptically polarized light.
In this embodiment, the lens unit 400 is disposed between the light conversion unit 120 and the polarization unit 140, and the partially transmissive partially reflective member 130 is disposed on a surface of the lens unit 400 close to the display unit 110, such that the lens unit 400 is disposed between the partially transmissive partially reflective member 130 and the polarization unit 140. Specifically, the lens unit 400 includes a zoom lens 150. The zoom lens 150 may be an Alvarez lens comprising a first mirror 151 and a second mirror 152. The first and second mirror 151 and 152 are movable in a direction perpendicular to the optical axis of the zoom lens 150 to change the focal length of the zoom lens 150. Specifically, the system power (inverse of the focal length) variable is linear with the amount of translation of the two lenses. At this time, the multi-focal plane display system 100 further includes a driving unit 153 for moving the two lenses perpendicular to the optical axis direction to generate a plurality of focal planes, so that the different depths of field of a picture can be matched with the corresponding virtual distances to adapt to the convergence adjustment of the human eyes. Since the focal plane is not the plane where the object or image focal point of the lens is located, but is a plane where the normal human eye focuses clearly, the focal plane is also equivalent to the virtual image distance vid (visual image distance) and is also measured by the visual degree d (viewer). The conversion relationship is as follows: the visibility is 1/VID, the unit of the visibility is D, and the unit of the VID is m. For example, a 1m diopter is 1D. Generally, the adjustment range of the visibility needs to cover 0D to 4D. Furthermore, the visibility can be selected to be 0.5D-3D, and the adjusting interval is less than or equal to 0.67D. Therefore, at least 5 sampling points are included in the range of 0.5D to 3D visibility. The first lens 151 is disposed on an incident surface of the light, and the second lens 152 is disposed on an exit surface of the light. That is, the first lens 151 is disposed at a side close to the display unit 110, and the second lens 152 is disposed at a side far from the display unit 110. In this embodiment, the partially transmissive and partially reflective member 130 is disposed on the light incident surface of the first mirror 151, that is, the partially transmissive and partially reflective member 130 is disposed on the surface of the first mirror 151 near the display unit. In operation, light emitted from the display unit 110 is converted into circularly polarized light or elliptically polarized light by the light conversion unit 120, and then enters the zoom lens 150, and is transmitted and reflected on the surface of the partially transmitting and partially reflecting member 130, and the transmitted light passes through the zoom lens 150. The zoom lens 150 further comprises a driving unit 153 for driving the first lens 151 and the second lens 152 to move along a direction perpendicular to the optical axis, so as to change the focal length of the zoom lens 150. If desired, the partially transmissive and partially reflective member 130 can also be disposed on the light exit surface of the second lens 152. That is, the partially transmissive and partially reflective member 130 may be disposed on a surface of the second lens 152 away from the display unit 110.
In this embodiment, the first phase retarder 141 is disposed on a light incident surface of the polarization unit 140, and the first polarizer 142 is disposed on a light exiting surface of the polarization unit 140. The light emitted from the zoom lens 150 reaches the polarization unit 140, is changed into the first linearly polarized light after being phase-delayed by the first phase retarder 141, and is incident to the first polarizer 142. The first polarizer 142 reflects the first linearly polarized light and transmits the second linearly polarized light. Therefore, the first linearly polarized light is incident to the first polarizer 142 and then reflected back to the first phase retarder 141. The light reflected by the first polarizer 142 is phase-delayed by the first phase retarder 141 again to form circularly polarized light or elliptically polarized light, and the circularly polarized light or elliptically polarized light is incident on the zoom lens 150. The circularly polarized light or elliptically polarized light formed after reflection is reflected by the partially transmitting partially reflecting part 130 provided in the zoom lens 150 and then passes through the first phase retarder 141 again. At this time, the light becomes a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light. The second linearly polarized light may pass through the first polarizer 142 and then enter the human eye. The polarization unit 140 may further include a transparent substrate 143, as needed. The first phase retarder 141 is disposed on a side of the transparent substrate 143 close to the display unit 110, and the first polarizer 142 is disposed on a side of the transparent substrate 143 away from the display unit 110. The transparent substrate 143 may better fix the first phase retarder 31 and the first polarizer 142. The first phase retarder and the first polarizer 142 are attached to the transparent substrate 143, as needed.
In the multi-focal plane display system 100 provided by the embodiment of the present invention, by providing the partially transmissive partially reflective member 130 and the polarization unit 140, the polarization unit 140 includes the first phase retarder 141 and the first polarization member 142. After passing through the partially transmissive partially reflective member 130, the light emitted from the display unit 110 is folded back among the partially transmissive partially reflective member 130, the first phase retarder 141, and the first polarizer 142, and finally emitted from the first polarizer 142 to human eyes. The zoom lens 150 may generate a plurality of focal planes to adapt to the gaze direction of the human eyes, thereby alleviating the visual fatigue caused by the convergence conflict.
It is to be understood that the zoom lens 150 is not limited to being disposed between the partially transmissive partially reflective member 130 and the polarization unit 140. The zoom lens 150 is disposed on a side of the polarization unit 140 away from the display unit 110, as needed.
Referring to fig. 3, another embodiment of the present invention provides a multi-focal plane display system 200, which includes, according to the following steps: a display unit 110, a light conversion unit 120, a partially transmissive partially reflective member 130, a polarization unit 140, and a lens unit 400.
The display unit 110 is configured to emit light carrying image information. The light conversion unit 120 is configured to convert light emitted from the display unit 110 into circularly polarized light or elliptically polarized light. The partially transmissive partially reflective member 130 for transmitting or reflecting the circularly polarized light or the elliptically polarized light. The polarization unit 140 includes a first phase retarder 141 and a first polarizer 142. The first phase retarder 141 is used to convert circularly polarized light or elliptically polarized light transmitted by the partially transmissive partially reflective member 130 into first linearly polarized light. The first polarizer 142 is configured to reflect the first linearly polarized light and transmit a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light.
The lens unit 400 is located on the same side of the display unit 110 as the light conversion unit 120, the partially transmissive partially reflective member 130, and the polarization unit 140. In this embodiment, the lens unit 400 is disposed on a side of the polarization unit 140 away from the display unit 110.
The light conversion unit 120 includes a second polarizer 121 and a second phase retardation element 122 sequentially disposed. The second polarizer 121 is used for converting the light emitted from the display unit 110 into linearly polarized light. The second phase delay element 122 is configured to convert the linearly polarized light generated by the second polarizer 121 into circularly polarized light or elliptically polarized light. In this embodiment, the second polarizer 121 is a polarizer for converting the light emitted from the display unit 110 into linearly polarized light. The second phase retarder 122 is a quarter-wave plate for converting linearly polarized light after passing through the second polarizer 121 into circularly polarized light or elliptically polarized light.
The partially transmissive and partially reflective member 130 is disposed on a side of the light conversion unit 120 away from the display unit 110. The circularly polarized light or elliptically polarized light emitted from the light conversion unit 120 exits to the polarization unit 140 through the partially transmissive partially reflective member 130.
In this embodiment, the first phase retarder 141 is disposed on a light incident surface of the polarization unit 140, and the first polarizer 142 is disposed on a light exiting surface of the polarization unit 140. The light emitted from the partially transmitting and partially reflecting member 130 reaches the polarizing unit 140, is changed into the first linearly polarized light after being phase-delayed by the first phase retarder 141, and is incident to the first polarizer 142. The first polarizer 142 reflects the first linearly polarized light and transmits the second linearly polarized light. Therefore, the first linearly polarized light is incident to the first polarizer 142 and then reflected back to the first phase retarder 141. The light reflected by the first polarizer 142 is phase-delayed again by the first phase retarder 141 to form circularly polarized light or elliptically polarized light, and is incident to the partially transmissive partially reflective member 130. The circularly polarized light or elliptically polarized light formed after reflection is reflected by the partially transmitting partially reflecting part 130 and then passes through the first phase retarder 141 again. At this time, the light becomes a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light. The second polarized light may pass through the first polarizer 142 and then be incident to the zoom lens 150. The polarization unit 140 may further include a transparent substrate 143, as needed. The first phase retarder 141 is disposed on a side of the transparent substrate 143 close to the display unit 110, and the first polarizer 142 is disposed on a side of the transparent substrate 143 away from the display unit 110.
In the present embodiment, the lens unit 400 includes a zoom lens 150. The zoom lens 150 is disposed behind the polarization unit 140. The second linearly polarized light emitted from the polarization unit 140 passes through the zoom lens 150 and then is emitted to the human eye. In this embodiment, the zoom lens 150 may be an Alvarez lens, which includes a first mirror 151 and a second mirror 152. The first and second mirror 151 and 152 are movable in a direction perpendicular to the optical axis of the zoom lens 150 to change the focal length of the zoom lens 150. The first lens 151 is disposed on an incident surface of the light, and the second lens 152 is disposed on an exit surface of the light. In operation, light emitted from the polarization unit 140 enters the zoom lens 150 and then exits to the human eye through the zoom lens 150. The zoom lens 150 further comprises a driving unit 153 for driving the first lens 151 and the second lens 152 to move in a direction perpendicular to the optical axis of the zoom lens 150, so as to change the focal length of the zoom lens 150.
In the multi-focal plane display system 200, by providing the partially transmissive partially reflective part 130 and the polarizing unit 140, since the polarizing unit 140 includes the first phase retarder 141 and the first polarizing member 142. After passing through the partially transmissive partially reflective member 130, the light emitted from the display unit 110 is folded back among the partially transmissive partially reflective member 130, the first phase retarder 141, and the first polarizer 142, and finally emitted from the first polarizer 142 to human eyes. The zoom lens 150 may generate a plurality of focal planes to adapt to the gaze direction of the human eyes, thereby alleviating the visual fatigue caused by the convergence conflict.
As required, the present invention provides a multi-focal plane display system not limited to the above embodiments.
Referring to fig. 4, another embodiment of the present invention further provides a multi-focal plane display system 300, which includes, according to the following steps: a display unit 110, a light conversion unit 120, a partially transmissive partially reflective member 130, a polarization unit 140, and a lens unit 400.
The display unit 110 is configured to emit light carrying image information. The light conversion unit 120 is configured to convert light emitted from the display unit 110 into circularly polarized light or elliptically polarized light. The partially transmissive partially reflective member 130 for transmitting or reflecting the circularly polarized light or the elliptically polarized light. The polarization unit 140 includes a first phase retarder 141 and a first polarizer 142. The first phase retarder 141 is used to convert circularly polarized light or elliptically polarized light transmitted by the partially transmissive partially reflective member 130 into first linearly polarized light. The first polarizer 142 is configured to reflect the first linearly polarized light and transmit a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light.
The light conversion unit 120 includes a second polarizer 121 and a second phase retardation element 122 sequentially disposed. The second polarizer 121 is used for converting the light emitted from the display unit 110 into linearly polarized light. The second phase delay element 122 is configured to convert the linearly polarized light generated by the second polarizer 121 into circularly polarized light or elliptically polarized light. In this embodiment, the second polarizer 121 is a polarizer for converting the light emitted from the display unit 110 into linearly polarized light. The second phase retarder 122 is a quarter-wave plate for converting linearly polarized light after passing through the second polarizer 121 into circularly polarized light or elliptically polarized light.
The lens unit 400 is located on the same side as the light conversion unit 120, the partially transmissive partially reflective member 130, and the polarization unit 140. In the present embodiment, the lens unit 400 includes a zoom lens 150. The zoom lens 150 is disposed between the display unit 110 and the light ray conversion unit 120. The light emitted from the display unit 110 passes through the zoom lens 150 and then exits to the light conversion unit 120. In this embodiment, the zoom lens 150 may be an Alvarez lens, which includes a first mirror 151 and a second mirror 152. The first mirror 151 and the second mirror 152 are movable in a direction perpendicular to the optical axis to change the focal length of the zoom lens 150. The first lens 151 is disposed on an incident surface of the light, and the second lens 152 is disposed on an exit surface of the light. The zoom lens 150 further comprises a driving unit 153 for driving the first lens 151 and the second lens 152 to move in a direction perpendicular to the optical axis of the zoom lens 150, so as to change the focal length of the zoom lens 150. The lens unit 400 may further include an auxiliary lens 154, as needed. The auxiliary lens 154 is disposed between the light conversion unit 120 and the polarization unit 140. The partially transmissive partially reflective member 130 is disposed on the auxiliary lens 154. In the present embodiment, the partially transmissive partially reflective member 130 is disposed on the light incident surface of the auxiliary lens 154. In operation, the light emitted from the display unit 110 first passes through the zoom lens 150, and then passes through the second polarizer 121 to be converted into linearly polarized light. The second phase retardation element 122 converts the linearly polarized light generated by the second polarizer 121 into circularly polarized light or elliptically polarized light. The circularly polarized light or elliptically polarized light emitted from the second phase retardation element 122 enters the auxiliary lens 154, and is transmitted and reflected on the surface of the partially transmitting and partially reflecting member 130, and the transmitted light partially passes through the auxiliary lens 154 and is emitted to the polarizing unit 140. The partially transmissive and partially reflective member 130 may also be disposed on the light exit surface of the auxiliary lens 154, as needed.
In this embodiment, the first phase retarder 141 is disposed on a light incident surface of the polarization unit 140, and the first polarizer 142 is disposed on a light exiting surface of the polarization unit 140. The light emitted from the auxiliary lens 154 reaches the polarization unit 140, is changed into the first linearly polarized light after being phase-delayed by the first phase retarder 141, and is incident to the first polarizer 142. The first polarizer 142 reflects the first linearly polarized light and transmits the second linearly polarized light. Therefore, the first linearly polarized light is incident to the first polarizer 142 and then reflected back to the first phase retarder 141. The light reflected by the first polarizer 142 is phase-delayed by the first phase retarder 141 again to form circularly polarized light or elliptically polarized light, and the circularly polarized light or elliptically polarized light is incident on the auxiliary lens 154. The circularly polarized light or elliptically polarized light formed after reflection is reflected by the partially transmitting partially reflecting member 130 provided on the auxiliary lens 154 and then passes through the first retarder 31 again. At this time, the light becomes a second linearly polarized light perpendicular to the polarization direction of the first linearly polarized light. The light of the second polarization may pass through the first polarizer 142 and then enter the human eye. The polarization unit 140 may further include a transparent substrate 143, as needed. The first phase retarder 141 is disposed on a side of the transparent substrate 143 close to the display unit 110, and the first polarizer 142 is disposed on a side of the transparent substrate 143 away from the display unit 110.
In the multi-focal plane display system 300, by providing the partially transmissive partially reflective part 130 and the polarizing unit 140, since the polarizing unit 140 includes the first phase retarder 141 and the first polarizing member 142. After passing through the partially transmissive partially reflective member 130, the light emitted from the display unit 110 is folded back among the partially transmissive partially reflective member 130, the first phase retarder 141, and the first polarizer 142, and finally emitted from the first polarizer 142 to human eyes. The zoom lens 150 may generate a plurality of focal planes to adapt to the gaze direction of the human eyes, thereby alleviating the visual fatigue caused by the convergence conflict.
Further, in the multi-focal plane display system 300, a partially transmissive partially reflective member 130 is positioned above the auxiliary lens 154 and behind the first mirror 151 and the second mirror 152. That is, in this embodiment, the light emitted by the display unit 110 passes through the first lens 151 and the second lens 152 first, and then is folded. At this time, the second polarizer 121 is disposed behind the first mirror 151 and the second mirror 152, so that the requirement of the Alvarez lens composed of the first mirror 151 and the second mirror 152 on stress can be reduced.
It should be noted that the above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (10)
1. A multi-focal plane display system, comprising, in order: a display unit, a light conversion unit, a partially transmissive partially reflective member, and a polarization unit;
the display unit is used for emitting light carrying image information; the light conversion unit is used for converting the light emitted by the display unit into circularly polarized light or elliptically polarized light; the partial transmission and partial reflection component is used for transmitting or reflecting the circularly polarized light or the elliptically polarized light; the polarization unit comprises a first phase delay piece and a first polarization piece, wherein the first phase delay piece is used for converting circularly polarized light or elliptically polarized light transmitted by the partial transmission partial reflection component into first linearly polarized light, and the first polarization piece is used for reflecting the first linearly polarized light and transmitting second linearly polarized light vertical to the polarization direction of the first linearly polarized light;
the display system further includes:
and a lens unit located on the same side as the light conversion unit, the partially transmissive and partially reflective member, and the polarization unit.
2. The multi-focal-plane display system of claim 1, wherein the light conversion unit comprises a second polarizer and a second phase retardation element sequentially disposed, the second polarizer is configured to convert the light emitted from the display unit into linearly polarized light, and the second phase retardation element is configured to convert the linearly polarized light generated by the second polarizer into circularly polarized light or elliptically polarized light.
3. The multi-focal-plane display system of claim 2, wherein the lens unit comprises a zoom lens comprising a first mirror and a second mirror, the first mirror and the second mirror being movable in a direction perpendicular to an optical axis of the zoom lens to change a focal length of the zoom lens, the first mirror being disposed on a side near the display unit.
4. The multi-focal-plane display system of claim 3, wherein the zoom lens further comprises a driving unit for driving the first mirror and the second mirror to move in a direction perpendicular to the optical axis.
5. The multi-focal-plane display system of claim 3, wherein the zoom lens is disposed between the partially transmissive partially reflective element and the polarizing unit.
6. The multi-focal-plane display system of claim 5, wherein the partially transmissive partially reflective element is disposed on a surface of the first optic proximate to the display unit.
7. The multi-focal-plane display system of claim 3, wherein the zoom lens is disposed between the light conversion unit and the partially transmissive partially reflective element.
8. The multi-focal-plane display system of claim 7, wherein the partially transmissive partially reflective element is disposed on a surface of the second optic remote from the display unit.
9. The multi-focal-plane display system of claim 3, wherein the zoom lens is disposed on a side of the polarizing unit away from the display unit.
10. The multi-focal-plane display system of claim 3, wherein the lens unit further comprises: an auxiliary lens, the zoom lens being disposed between the display unit and the light ray conversion unit, the auxiliary lens being disposed between the light ray conversion unit and the polarization unit, the partially transmissive partially reflective member being disposed on the auxiliary lens.
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| CN202022635413.0U CN213600993U (en) | 2020-11-13 | 2020-11-13 | Multi-focal plane display system |
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| CN202022635413.0U CN213600993U (en) | 2020-11-13 | 2020-11-13 | Multi-focal plane display system |
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