CN212586650U - Augmented reality display system for improving image quality - Google Patents
Augmented reality display system for improving image quality Download PDFInfo
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- CN212586650U CN212586650U CN202021323067.6U CN202021323067U CN212586650U CN 212586650 U CN212586650 U CN 212586650U CN 202021323067 U CN202021323067 U CN 202021323067U CN 212586650 U CN212586650 U CN 212586650U
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Abstract
The embodiment of the utility model provides an augmented reality display system for improving image quality, which comprises a display screen, a wave plate, a transflective mirror, a concave reflector and a circular polarizer close to the human eye side, wherein the display screen, the wave plate, the transflective mirror and the concave reflector are arranged in sequence; wherein, the optical axis of the transflective mirror and the reflector forms a predetermined included angle. Adopt the utility model provides an augmented reality display system can effectual elimination parasitic light, improves like quality, reduce cost.
Description
Technical Field
The utility model relates to an optics field especially indicates an improve augmented reality display system of image quality.
Background
The Birdbath-based optical system is a common optical path form in the current augmented reality optical system, and its basic structure is as shown in fig. 1, where the display screen 1 emits image light, the total reflection lens 3 reflects the image light transmitted through the transflective mirror 2 to the transflective mirror 2 again, and the transflective mirror 2 reflects the image light to the exit pupil 4. The Birdbath optical system can realize large-view-field distortion-free amplified display and is widely applied in many scenes, but the optical system has stray light which is difficult to eliminate, as shown in fig. 2, ambient light enters the optical system from the outside through the semi-reflective and semi-transparent lens 2, then is reflected to the semi-reflective and semi-transparent lens 2 through the total reflection lens 3 and enters human eyes again for imaging, when an observer uses equipment comprising the optical system, the observer can see an amplified image of the face of the observer besides an amplified image of a display screen, and viewing experience is influenced greatly.
In order to eliminate such stray light, patent No. CN201921540617 proposes a solution as shown in fig. 3, in which external ambient light passes through the half-mirror 36 and becomes linearly polarized light, enters the optical system, is reflected by the half-mirror 32 and enters the quarter-wave plate 35 to become circularly polarized light, is reflected by the total reflector 33 and again becomes linearly polarized light through the quarter-wave plate 35, and then is reflected by the half-mirror 32, reaches the linear polarizer 36 in a direction opposite to the entering direction, and is absorbed by the linear polarizer 36, so as to eliminate the self-enlarged image, however, in practical use, this structure has a defect because the surface reflectivity of the quarter-wave plate is high, when the image light of the display screen 31 passes through the half-mirror and reaches the quarter-wave plate, a partial image of the light reaches the total reflector 33 through the quarter-wave plate 35, and is enlarged by the total reflector 33, the light passes through the quarter-wave plate 35 and the half-reflecting and half-transmitting mirror 32 again, and then reaches human eyes through the linear polarizer 36, and the human eyes see an amplified display screen image, meanwhile, as shown in fig. 4, because the upper surface reflectivity of the quarter-wave plate is high, in addition, in the practical use, the materials and the process used by the linear polarizer and the polarization degree of the display screen generally do not reach ideal design parameters, another part of the image light is directly reflected by the quarter-wave plate 35 to reach the half-reflecting and half-transmitting mirror 32, and then reaches the human eyes through the linear polarizer 36, and the human eyes see an unamplified display screen image at the same time.
Disclosure of Invention
In view of the above problems, an embodiment of the present invention provides an augmented reality display system for improving image quality, including an augmented reality display system for improving image quality, which is characterized in that the display system comprises a display screen, a wave plate, a transflective mirror, a concave reflecting mirror, and a circular polarizer perpendicular to the concave reflecting mirror and close to human eyes;
wherein, the optical axis of the transflective mirror and the concave reflecting mirror forms a preset included angle.
Furthermore, the inverse transmission ratio of the transflective mirror is a preset value.
Further, the half-reflecting and half-transmitting mirror is a half-reflecting and half-transmitting mirror, namely the preset value is 1: 1.
Further, the circular polarizer is matched with the rotation direction of the image light emitted by the wave plate.
Further, the circular polarization is vertically arranged on one side of the concave reflecting mirror close to the human eyes.
Further, the optical axis of the transflective mirror and the optical axis of the concave reflecting mirror form an angle of 45 degrees.
Further, the image light emitted by the display screen is linearly polarized light, and correspondingly, a polarizing film is arranged in or outside the display screen.
Further, the wave plate is a quarter wave plate.
Further, the fast axis or the slow axis of the wave plate forms an angle of 45 degrees with the linearly polarized light.
Adopt the utility model provides an augmented reality display system through setting up the circular polarization piece near the eye position, can effectual elimination by the miscellaneous light that the eye got into, overcome the image that the display screen enlargies among the prior art simultaneously and image simultaneously with the image that does not enlarge in the people's eye, cause the shortcoming that the imaging quality descends, can effectual elimination miscellaneous light, improve the image quality to for prior art, the utility model discloses the scheme has realized better effect, the effectual cost that has reduced under the condition that does not introduce the plane of reflection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a prior art Birdbath solution;
FIG. 2 is a schematic diagram of an optical path structure of Birdbath stray light;
FIG. 3 is a schematic diagram of an augmented reality display for eliminating stray light in the prior art;
FIG. 4 is a schematic diagram of the optical path of a prior art solution;
fig. 5 is a schematic structural view of an augmented reality display of the present invention;
FIG. 6 is a schematic view of the optical path of the stray light eliminating device of the present invention;
FIG. 7 is a simulation experiment diagram of the utility model for eliminating stray light;
fig. 8 is the simulation experiment chart of the augmented reality display of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 5 is an augmented reality display system for improving image quality provided by the present invention, which includes a display screen 51, a wave plate 52, a transflective mirror 53, a concave reflecting mirror 54 and a circular polarizer 55, wherein, the display screen 51, the wave plate 52 and the concave reflector 54 are arranged in parallel, the display screen 51 and the wave plate 52 are positioned at the same side of the transflective mirror 53, the wave plate 52 is positioned between the display screen 51 and the transflective mirror 53, the concave reflector 54 is positioned at the other side of the transflective mirror 53, the transflective mirror 53 and the optical axis of the concave reflector 54 form a preset angle, so that the image light is reflected by the mirror 53 into the human eye via the circular polarizing plate 55, the circular polarizing plate 55 is disposed on the side close to the human eye, the position of the circular polarizer is matched with the rotation direction of the image light after passing through the wave plate 52, so that the circular polarizer 55 can pass through, and preferably, when the circular polarizer 55 is vertically arranged on the side of the concave reflecting mirror 54 close to the human eyes, the structure of the augmented reality display is easier to design and assemble.
Specifically, the existing display screen generally has a built-in polarizer to emit linearly polarized light, or the display screen is externally provided with a polarizer to convert the emitted image light into linearly polarized light, the linearly polarized light passes through a wave plate 52 to convert the linearly polarized light into circularly polarized light, the rotation direction of the circularly polarized light matches with that of the circularly polarized light, so that the image light can pass through the circularly polarized light, the wave plate 52 is preferably a quarter wave plate, the fast axis or slow axis direction of the quarter wave plate forms an angle of 45 degrees with the polarization direction of the linearly polarized light, the quarter wave plate transmits through a reflective mirror, reaches a concave reflecting mirror 54, and then is reflected by a reflective mirror 53 to reach the circularly polarized light again, at this time, the polarization angle of the image light is consistent with that of the circularly polarized light, so that the circularly polarized light passes through the circularly polarized light 55 to reach human eyes, at this time, the external environment light transmits through the reflective mirror 53 and the circularly polarized, creating an effect of augmented reality display. Here, one side of the half mirror 53 is plated with a half-reflecting film, and the inverse ratio of the half-reflecting film to the half-reflecting film can be set according to the requirement, and is preferably half, that is, when the half-reflecting half mirror 53 is formed, the image light of the display screen and the image light entering the eyes from the outside have a relatively balanced effect.
As shown in fig. 6, the ambient light of the eye enters the optical system through the circularly polarizing plate 55, changes its rotation angle, becomes left-handed or right-handed circularly polarized light, is reflected by the mirror 53 to the concave reflecting mirror 54, and is reflected again by the mirror 53 to the circularly polarizing plate 55.
Fig. 7 is the simulation effect picture of veiling glare elimination, fig. 8 is the simulation effect picture for realizing that augmented reality shows, can see from the simulation effect, the utility model discloses a structure that augmented reality shows can also eliminate veiling glare on avoiding the display screen to enlarge the image and not amplifying the basis that the image shows simultaneously, has improved image quality.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that
It should be understood that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An augmented reality display system for improving image quality is characterized by comprising a display screen, a wave plate, a transflective mirror, a concave reflecting mirror and a circular polarizing film arranged close to the side of human eyes, wherein the display screen, the wave plate, the transflective mirror and the concave reflecting mirror are sequentially arranged;
wherein, the optical axis of the transflective mirror and the concave reflecting mirror forms a preset included angle.
2. The display system of claim 1, wherein the inverse transmittance ratio of the transflective mirror is a predetermined value.
3. The display system of claim 2, wherein the half-mirror is a half-mirror, i.e. the preset values are 1: 1.
4. the display system of claim 1 wherein the circular polarizer matches the handedness of the image light exiting the wave plate.
5. The display system of claim 4, wherein the circular polarizer is vertically disposed on a side of the concave mirror adjacent to the human eye.
6. A display system according to any one of claims 1 to 5, wherein the transflective mirror is at 45 degrees to the optical axis of the concave reflecting mirror.
7. A display system according to claim 6, wherein the image light emitted by the display screen is linearly polarized light, which, in turn,
the display screen is internally provided with or externally provided with a polaroid.
8. The display system of claim 1 wherein the wave plate is a quarter wave plate.
9. The display system of claim 7 wherein the fast or slow axis of the wave plate is at a 45 degree angle to linearly polarized light.
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| CN202021323067.6U CN212586650U (en) | 2020-07-08 | 2020-07-08 | Augmented reality display system for improving image quality |
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| CN202021323067.6U CN212586650U (en) | 2020-07-08 | 2020-07-08 | Augmented reality display system for improving image quality |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023061078A1 (en) * | 2021-10-14 | 2023-04-20 | 华为技术有限公司 | Display device, electronic apparatus, and transportation means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023061078A1 (en) * | 2021-10-14 | 2023-04-20 | 华为技术有限公司 | Display device, electronic apparatus, and transportation means |
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