CN112083576A - Geometric optical waveguide optical display system and wearable equipment - Google Patents

Geometric optical waveguide optical display system and wearable equipment Download PDF

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Publication number
CN112083576A
CN112083576A CN202011148330.7A CN202011148330A CN112083576A CN 112083576 A CN112083576 A CN 112083576A CN 202011148330 A CN202011148330 A CN 202011148330A CN 112083576 A CN112083576 A CN 112083576A
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China
Prior art keywords
optical
light
prism
display system
optical prism
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CN202011148330.7A
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Chinese (zh)
Inventor
周莹
王锐
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Ningbo Hongyi Photoelectric Technology Co ltd
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Ningbo Hongyi Photoelectric Technology Co ltd
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Priority to CN202011148330.7A priority Critical patent/CN112083576A/en
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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
    • 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
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • 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
    • G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
    • G02B2027/0114—Head-up displays characterised by optical features comprising device for genereting colour display comprising dichroic elements

Abstract

The invention provides a geometric optical waveguide optical display system and wearable equipment, belonging to the technical field of AR, and comprising a display, a field lens, a beam splitter, a reflector and an optical waveguide sheet; the field lens set up in the light-emitting light path of display, the beam splitter set up in the transmission light path of field lens, the speculum set up in the reflection light path of beam splitter, the optical waveguide piece set up in the transmission light path of beam splitter. The light transmission device adopts a catadioptric imaging system to couple imaging light of the display into the transparent thin substrate for light transmission, and is light, thin, small, large in eye movement range and high in optical transmittance. The wearable device is light, thin and small, has a large eye movement range, and is high in optical transmittance.

Description

Geometric optical waveguide optical display system and wearable equipment
Technical Field
The invention belongs to the technical field of AR, and particularly relates to a geometric optical waveguide optical display system and wearable equipment.
Background
Augmented Reality (AR) is a technology for presenting digital images generated by computer and other terminal devices to the eyes of users through a transmissive optical display system, and combines a virtual world and a real world, so as to bring a brand new interactive experience to the users. The transmission type geometric optical waveguide optical display system is one of the core technologies in the field of augmented reality. Wearable devices currently using enhanced display technology are widely used in the fields of gaming, retail, education, industry, medical care, and the like.
At present, the transmission optical display technology can be divided into two schemes, i.e., a traditional geometrical optical scheme and an optical waveguide scheme. The traditional geometric optics scheme generally has the problems of small eye movement range, large module thickness, low optical transmittance and the like. The problem that eye movement scope is little, optical transmittance is low can be solved to the geometry optical waveguide scheme, promotes user experience, but current geometry optical waveguide scheme still exists that the module is bulky, the module is overweight, the complicated difficult volume production scheduling problem of imaging lens group, and these shortcomings have not only increased the cost of geometry optical waveguide module but also can reduce the use experience of the wearable equipment of augmented reality.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a geometric optical waveguide optical display system, which is light, thin, small, and has a large eye movement range and high optical transmittance.
Another object of the embodiments of the present invention is to provide a wearable device, which is light, thin, small, and has a large eye movement range, high optical transmittance, good imaging quality, and convenient wearing.
The embodiment of the invention is realized by the following steps:
the embodiment of the invention provides a geometric optical waveguide optical display system, which comprises a display, a field lens, a light splitting sheet, a reflector and an optical waveguide sheet; the field lens set up in the light-emitting light path of display, the beam splitter set up in the transmission light path of field lens, the speculum set up in the reflection light path of beam splitter, the optical waveguide piece set up in the transmission light path of beam splitter.
Optionally, the light splitter includes an optical substrate, a phase retardation film, and a polarization reflection film, the polarization reflection film is disposed on a side of the optical substrate close to the field lens, and the phase retardation film is disposed on a side of the polarization reflection film far from the optical substrate.
Optionally, the optical waveguide sheet includes a first optical prism, a second optical prism and a third optical prism, the second optical prism is disposed on a side of the first optical prism far away from the beam splitter, the third optical prism is disposed on a side of the second optical prism far away from the first optical prism, and partial reflection partial transmission films are disposed between the first optical prism and the second optical prism and between the second optical prism and the third optical prism.
Optionally, the second optical prisms are parallelogram prisms, the number of the second optical prisms is multiple, the multiple second optical prisms are sequentially arranged from the first optical prism to the third optical prism and are tightly attached to form a prism array, a partial reflection part transmission film is arranged between every two adjacent second optical prisms, and the partial reflection part transmission films are parallel to each other.
Alternatively, the reflectivities of the partially reflective partially transmissive films in the direction from the first optical prism toward the third optical prism may be R1, R2, and R3 … … Rn in this order, which satisfies 1% < R1 < R2 < R3 < … … < Rn < 99%.
Optionally, the reflector is a concave reflector, and a concave surface of the concave reflector faces the light splitter.
Optionally, the number of the field lenses is multiple, and the multiple field lenses are sequentially arranged on the light emitting path of the display.
Optionally, a distance between a sheet of the field lens close to the display and the center of the display is L1, which satisfies 0 < L1 < 20 mm.
Optionally, a distance between the field lens close to the light splitter and the center of the light splitter is L2, which satisfies 0 < L2 < 30 mm.
Optionally, the center-to-center distance between the beam splitter and the reflector is L3, which satisfies 0 < L3 < 30 mm.
Optionally, a distance between a center of a side surface of the light splitting sheet adjacent to the optical waveguide sheet and a center of a side surface of the optical waveguide sheet adjacent to the light splitting sheet is L4, which satisfies 5 < L4 < 35 mm.
Optionally, an acute angle formed by the light-emitting surface of the display and the light splitting sheet is θ1Which satisfies: 15 degree<θ1<60°。
Optionally, an acute angle formed by the light splitter and a side surface of the first optical prism close to the light splitter is θ2Which satisfies: 5 degree<θ2<85°。
Optionally, an included angle formed by a side surface of the first optical prism close to the light splitting sheet and a bottom side surface of the first optical prism is θ3Which satisfies: 10 degree<θ3<60°。
Optionally, an included angle formed between each partially reflective partially transmissive film and the second optical surface in a direction from the first optical prism to the third optical prism and on a side close to the light splitting sheet is θ41、θ42、θ43……θ4nWhich satisfies: theta < 100 DEG41＜170°、100°＜θ42＜170°、100°＜θ43＜170°……100°＜θ4n＜170°。
Optionally, an included angle formed between each partially reflective partially transmissive film and the second optical surface in a direction from the first optical prism to the third optical prism and on a side close to the light splitting sheet is θ41、θ42、θ43……θ4nWhich satisfies: theta is 10 DEG < theta41＜80°、10°＜θ42＜80°、10°＜θ43＜80°……10°＜θ4n＜80°。
The embodiment of the invention also provides wearable equipment, which comprises a wearing part and the geometric optical waveguide optical display system, wherein the geometric optical waveguide optical display system is arranged on the wearing part.
The invention has the beneficial effects that:
the geometric optical waveguide optical display system provided by the embodiment of the invention adopts the catadioptric imaging system to couple the imaging light of the display into the transparent thin substrate for light transmission, and is light, thin, small, wide in eye movement range and high in optical transmittance.
The wearable device provided by the embodiment of the invention is light, thin and small, has a large eye movement range, is high in optical transmittance and clear in image, and greatly improves the wearing experience of a user.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of an optical architecture of a geometric optical waveguide optical display system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an optical architecture of a geometric optical waveguide optical display system according to a second embodiment of the present invention;
in the figure: 10-a display; 20-field lens; 30-a light splitting sheet; 301-an optical substrate; 302-a polarizing reflective film; 303-phase retardation film; 40-a mirror; 50-an optical waveguide sheet; 51-a first optical prism; 511-a first optical surface; 512-a second optical surface; 52-a second optical prism; 521-a partially reflective partially transmissive film; 53-a third optical prism; 60-human eye.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a geometric optical waveguide optical display system, which includes a display 10, a field lens 20, a beam splitter 30, a reflector 40, and an optical waveguide sheet 50.
The display 10 mainly plays a role of emitting light, the display 10 displays 2D or 3D images or videos, the display 10 may be an OLED display, an LCD display, an LCOS display, a DLP display, a micro-LED display, a micro-OLED display, a mini-LED display, or the like, and may be selected as needed, in this embodiment, the display 10 is an OLED display.
The field lens 20 primarily functions to reduce field curvature, distortion and dispersion. The two side surfaces of the field lens 20 may be planar, spherical, aspherical or free-form. Both side surfaces of the field lens 20 are provided with antireflection films (AR films) of visible light bands.
The field lens 20 is disposed on the light exit path of the display 10. The number of the field lenses 20 may be one or two or more, when the number of the field lenses 20 is two or more, the plurality of field lenses 20 are sequentially disposed on the light emitting path of the display 10, and the center distance between two adjacent field lenses 20 is D, which satisfies 0 < D < 10 mm.
The distance between the field lens 20 close to the display 10 and the center of the light emitting surface of the display 10 is L1, which satisfies 0 < L1 < 20 mm. In this example, L1 is 3 mm.
The spectroscope 30 is disposed on a transmission light path of the field lens 20.
The spectroscope 30 includes an optical substrate 301, a phase retardation film 303, and a polarization reflection film 302. The polarizing reflective film 302 is disposed on a side of the optical substrate 301 close to the field lens 20, and the phase retardation film 303 is disposed on a side of the polarizing reflective film away from the optical substrate 301. An antireflection film (AR film) in the visible light band is also provided on the surface of the optical substrate 301 on the side away from the polarizing reflective film 302.
The center distance between one field lens 20 close to the light splitting sheet 30 and the light splitting sheet 30 is L2, which satisfies 0 < L2 < 30 mm. In this example, L2 is 10 mm.
An acute angle formed by the light-emitting surface of the display 10 and the light-splitting sheet 30 is θ1Which satisfies: 15 degree<θ1<60 degrees. In the present embodiment, θ1Is 45 degrees.
The reflecting mirror 40 is disposed on the reflected light path of the spectroscope 30. The reflector 40 is a concave reflector 40, and the concave surface of the concave reflector 40 faces the light splitter 30. The concave surface type of the reflecting mirror 40 may be a spherical surface, an aspherical surface, or a free-form surface. The concave surface of the reflector 40 is provided with a high reflection film in the visible light band.
The center-to-center distance between the spectroscope 30 and the reflector 40 is L3, which satisfies 0 < L3 < 30 mm. In this example, L3 is 15 mm.
The optical waveguide sheet 50 is disposed on the transmission light path of the spectroscopic sheet 30.
The optical waveguide sheet 50 includes a first optical prism 51, a second optical prism 52, and a third optical prism 53.
The first optical prism 51 is located on the transmission light path of the spectroscope 30, the second optical prism 52 is disposed on the side of the first optical prism 51 away from the spectroscope 30, the third optical prism 53 is disposed on the side of the second optical prism 52 away from the first optical prism 51, and the partially reflective and partially transmissive films 521 are disposed between the second optical prism 52 and the first optical prism 51 and between the third optical prism 53 and the second optical prism 52. The partially reflective and partially transmissive film 521 between the second optical prism 52 and the first optical prism 51 may be disposed on a surface of the second optical prism 52 close to the first optical prism 51, or may be disposed on a surface of the first optical prism 51 close to the second optical prism 52; the partially reflective partially transmissive film 521 between the third optical prism 53 and the second optical prism 52 may be disposed on a surface of the third optical prism 53 on a side close to the second optical prism 52, or may be disposed on a surface of the second optical prism 52 on a side close to the third optical prism 53. In the present embodiment, the partially reflective partially transmissive film 521 between the second optical prism 52 and the first optical prism 51 is disposed on the surface of the second optical prism 52 on the side close to the first optical prism 51, and the partially reflective partially transmissive film 521 between the third optical prism 53 and the second optical prism 52 is disposed on the surface of the second optical prism 52 on the side close to the third optical prism 53.
The second optical prisms 52 are parallelogram prisms, the number of the second optical prisms 52 can be multiple, the multiple second optical prisms 52 are sequentially arranged from the first optical prism 51 to the third optical prism 53 and are tightly attached to form a prism array, partial reflection part transmission films 521 are arranged between every two adjacent second optical prisms 52, and the partial reflection part transmission films 521 are parallel to each other. The partially reflective and partially transmissive film 521 between two adjacent second optical prisms 52 may be disposed on one second optical prism 52 closer to the first optical prism 51, or may be disposed on one second optical prism 52 closer to the third optical prism 53. In the present embodiment, the partially reflective partially transmissive film 521 between two adjacent second optical prisms 52 is provided on one second optical prism 52 closer to the third optical prism 53.
The first optical prism 51, the second optical prism 52, and the third optical prism 53 may be bonded together by an adhesive material to form an integrated structure.
The reflectances of the partially reflective partially transmissive films 521 in the direction from the first optical prism 51 toward the third optical prism 53 are R1, R2, and R3 … … Rn in this order, and it satisfies 1% < R1 < R2 < R3 < … … < Rn < 99%.
The distance between the center of the surface of the light-splitting sheet 30 on the side closer to the optical waveguide sheet 50 and the center of the surface of the optical waveguide sheet 50 on the side closer to the light-splitting sheet 30 is L4, which satisfies 5 < L4 < 35 mm. In this example, L4 is 20 mm.
An acute angle formed by the beam splitter 30 and a surface of the first optical prism 51 on a side close to the beam splitter 30 is θ2Which satisfies: 5 degree<θ2<85 degrees. In the present embodiment, θ2Is 50 deg..
The two side surfaces of the first optical prism 51 in the thickness direction are respectively a first optical surface 511 and a second optical surface 512, the first optical surface 511 and the second optical surface 512 are parallel to each other, an included angle formed by the first optical surface 511 and a side surface of the first optical prism 51 close to the beam splitter 30 is an obtuse angle, and an included angle formed by the second optical surface 512 and a side surface of the first optical prism 51 close to the beam splitter 30 is an acute angle theta3Which satisfies: 10 degree<θ3<60 degrees. In the present embodiment, θ3Is 35 deg..
The angle between the partial reflection/transmission film 521 and the second optical surface 512 in the direction from the first optical prism 51 to the third optical prism 53 is θ in the order of the side closer to the beam splitter 3041、θ42、θ43……θ4nWhich satisfies: theta < 100 DEG41＜170°、100°＜θ42＜170°、100°＜θ43＜170°……100°＜θ4n< 170 deg. In the present embodiment, θ41＝θ42＝θ43＝……＝θ4n＝145°。
The imaging principle of the geometric optical waveguide optical display system provided by the embodiment is as follows:
the light emitted by the display 10 enters the light splitter 30 after being processed by the field lens 20, first passes through the phase retardation film 303 and reaches the polarization reflection film 302, then is reflected by the polarization reflection film 302 and passes through the phase retardation film 303 again to become circularly polarized light, then enters the reflector 40 to be reflected, the light reflected by the reflector 40 enters the light splitter 30 again and is transmitted out from the light splitter 30, the light transmitted out of the light splitter 30 is linearly polarized light and enters the optical waveguide sheet 50, the light propagates forwards in the optical waveguide sheet 50 and is reflected out of the geometric optical waveguide in the second optical prism 52 to be transmitted out, and then the light is received by the human eyes 60, so that the user can view a virtual image.
In this embodiment, the geometric optical waveguide is transmitted from the first optical surface 511 side of the first optical prism 51 in the optical waveguide sheet 50.
Example 2
Referring to fig. 2, a second embodiment of the present invention provides a geometric optical waveguide optical display system, which includes a display 10, a field lens 20, a beam splitter 30, a reflector 40, and an optical waveguide sheet 50.
The display 10 mainly plays a role of emitting light, the display 1060 can display 2D or 3D images or videos, the display 10 can be an OLED display 10, an LCD display 10, an LCOS display 10, a micro-LED display 10, a micro-OLED display 10, a mini-LED display 10, or the like, and the display 10 can be selected according to needs, in this embodiment, the display 10 is the OLED display 10.
The field lens 20 primarily functions to reduce field curvature, distortion and dispersion. The two side surfaces of the field lens 20 may be planar, spherical, aspherical or free-form. Both side surfaces of the field lens 20 are provided with antireflection films (AR films) of visible light bands.
The field lens 20 is disposed on the light exit path of the display 10. The number of the field lenses 20 may be one, or two or more, and when the number of the field lenses 20 is two or more, the plurality of field lenses 20 are sequentially disposed on the light emitting path of the display 10.
The distance between the field lens 20 close to the display 10 and the center of the light emitting surface of the display 10 is L1, which satisfies 0 < L1 < 20 mm. In this example, L1 is 15 mm.
The spectroscope 30 is disposed on a transmission light path of the field lens 20.
The spectroscope 30 includes an optical substrate 301, a phase retardation film 303, and a polarization reflection film 302. The polarizing reflective film 302 is disposed on a side of the optical substrate 301 close to the field lens 20, and the phase retardation film 303 is disposed on a side of the polarizing reflective film away from the optical substrate 301. An antireflection film (AR film) in the visible light band is also provided on the surface of the optical substrate 301 on the side away from the polarizing reflective film 302.
The center distance between one field lens 20 close to the light splitting sheet 30 and the light splitting sheet 30 is L2, which satisfies 0 < L2 < 30 mm. In this example, L2 is 15 mm.
An acute angle formed by the light-emitting surface of the display 10 and the light-splitting sheet 30 is θ1Which satisfies: 15 degree<θ1<60 degrees. In the present embodiment, θ1Is 40 deg..
The reflecting mirror 40 is disposed on the reflected light path of the spectroscope 30. The reflector 40 is a concave reflector 40, and the concave surface of the concave reflector 40 faces the light splitter 30. The concave surface type of the reflecting mirror 40 may be a spherical surface, an aspherical surface, or a free-form surface. The concave surface of the reflector 40 is provided with a high reflection film in the visible light band.
The center-to-center distance between the spectroscope 30 and the reflector 40 is L3, which satisfies 0 < L3 < 30 mm. In this example, L3 is 20 mm.
The optical waveguide sheet 50 is disposed on the transmission light path of the spectroscopic sheet 30.
The optical waveguide sheet 50 includes a first optical prism 51, a second optical prism 52, and a third optical prism 53.
The first optical prism 51 is located on the transmission light path of the spectroscope 30, the second optical prism 52 is disposed on the side of the first optical prism 51 away from the spectroscope 30, the third optical prism 53 is disposed on the side of the second optical prism 52 away from the first optical prism 51, and the partially reflective and partially transmissive films 521 are disposed between the second optical prism 52 and the first optical prism 51 and between the third optical prism 53 and the second optical prism 52. The partially reflective and partially transmissive film 521 between the second optical prism 52 and the first optical prism 51 may be disposed on a surface of the second optical prism 52 close to the first optical prism 51, or may be disposed on a surface of the first optical prism 51 close to the second optical prism 52; the partially reflective partially transmissive film 521 between the third optical prism 53 and the second optical prism 52 may be disposed on a surface of the third optical prism 53 on a side close to the second optical prism 52, or may be disposed on a surface of the second optical prism 52 on a side close to the third optical prism 53. In the present embodiment, the partially reflective partially transmissive film 521 between the second optical prism 52 and the first optical prism 51 is disposed on the surface of the second optical prism 52 on the side close to the first optical prism 51, and the partially reflective partially transmissive film 521 between the third optical prism 53 and the second optical prism 52 is disposed on the surface of the second optical prism 52 on the side close to the third optical prism 53.
The second optical prisms 52 are parallelogram prisms, the number of the second optical prisms 52 can be multiple, the multiple second optical prisms 52 are sequentially arranged from the first optical prism 51 to the third optical prism 53 and are tightly attached to form a prism array, partial reflection part transmission films 521 are arranged between every two adjacent second optical prisms 52, and the partial reflection part transmission films 521 are parallel to each other. The partially reflective and partially transmissive film 521 between two adjacent second optical prisms 52 may be disposed on one second optical prism 52 closer to the first optical prism 51, or may be disposed on one second optical prism 52 closer to the third optical prism 53. In the present embodiment, the partially reflective partially transmissive film 521 between two adjacent second optical prisms 52 is provided on one second optical prism 52 closer to the third optical prism 53.
The first optical prism 51, the second optical prism 52, and the third optical prism 53 may be bonded together by an adhesive material to form an integrated structure.
The reflectances of the partially reflective partially transmissive films 521 in the direction from the first optical prism 51 toward the third optical prism 53 are R1, R2, and R3 … … Rn in this order, and it satisfies 1% < R1 < R2 < R3 < … … < Rn < 99%.
The distance between the center of the surface of the light-splitting sheet 30 on the side closer to the optical waveguide sheet 50 and the center of the surface of the optical waveguide sheet 50 on the side closer to the light-splitting sheet 30 is L4, which satisfies 5 < L4 < 35 mm. In this example, L4 is 30 mm.
An acute angle formed by the beam splitter 30 and a surface of the first optical prism 51 on a side close to the beam splitter 30 is θ2Which satisfies: 5 degree<θ2<85 degrees. In the present embodiment, θ2Is 50 deg..
The two side surfaces of the first optical prism 51 in the thickness direction are respectively a first optical surface 511 and a second optical surface 512, the first optical surface 511 and the second optical surface 512 are parallel to each other, and the side surface of the first optical prism 51 close to the light-splitting sheet 30 and the first optical surface 511 are in the shape ofThe included angle is an obtuse angle, and the included angle formed by the surface of the first optical prism 51 close to the beam splitter 30 and the second optical surface 512 is an acute angle theta3Which satisfies: 10 degree<θ3<60 degrees. In the present embodiment, θ3Is 45 degrees.
The angle between the partial reflection/transmission film 521 and the second optical surface 512 in the direction from the first optical prism 51 to the third optical prism 53 is θ in the order of the side closer to the beam splitter 3041、θ42、θ43……θ4nWhich satisfies: theta is 10 DEG < theta41＜80°、10°＜θ42＜80°、10°＜θ43＜80°……10°＜θ4n< 80 deg. In the present embodiment, θ41＝θ42＝θ43＝……＝θ4n＝35°。
The imaging principle of the geometric optical waveguide optical display system provided by the embodiment is as follows:
the light emitted by the display 10 enters the light splitter 30 after being processed by the field lens 20, first passes through the phase retardation film 303 and reaches the polarization reflection film 302, then is reflected by the polarization reflection film 302 and passes through the phase retardation film 303 again to become circularly polarized light, then enters the reflector 40 to be reflected, the light reflected by the reflector 40 enters the light splitter 30 again and is transmitted out from the light splitter 30, the light transmitted out of the light splitter 30 is linearly polarized light and enters the optical waveguide sheet 50, the light propagates forwards in the optical waveguide sheet 50 and is reflected out of the geometric optical waveguide in the second optical prism 52 to be transmitted out, and then the light is received by the human eyes 60, so that the user can view a virtual image.
In this embodiment, the geometric optical waveguide is transmitted from the second optical surface 512 side of the first optical prism 51 in the optical waveguide sheet 50.
Example 3
The third embodiment of the invention also provides wearable equipment which comprises a wearing part and the geometric optical waveguide optical display system.
It should be noted that the geometric optical waveguide optical display system in this embodiment may adopt the geometric optical waveguide optical display system in embodiment 1 or embodiment 2, and the structure, the working principle, and the generated technical effect thereof refer to the corresponding contents in embodiment 1 or embodiment, which are not described herein again.
The geometric optical waveguide optical display system is arranged on the wearing part. The wearing part can be a helmet or an eyeglass frame and the like, so that the wearing part is convenient for people to wear on the head. Of course, the wearable device further comprises a control unit for controlling the device, a storage unit for storing images, videos, etc.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.

Claims (17)

1. A geometric light guide optical display system, characterized by: comprises a display, a field lens, a beam splitter, a reflector and an optical waveguide sheet; the field lens set up in the light-emitting light path of display, the beam splitter set up in the transmission light path of field lens, the speculum set up in the reflection light path of beam splitter, the optical waveguide piece set up in the transmission light path of beam splitter.
2. The geometric light guide optical display system of claim 1, wherein: the light splitting sheet comprises an optical substrate, a phase delay film and a polarization reflection film, wherein the polarization reflection film is arranged on one side, close to the field lens, of the optical substrate, and the phase delay film is arranged on one side, far away from the optical substrate, of the polarization reflection film.
3. The geometric light guide optical display system of claim 1, wherein: the optical waveguide sheet comprises a first optical prism, a second optical prism and a third optical prism, the second optical prism is arranged on one side, far away from the light splitting sheet, of the first optical prism, the third optical prism is arranged on one side, far away from the first optical prism, of the second optical prism, and partial reflection partial transmission films are arranged between the first optical prism and the second optical prism and between the second optical prism and the third optical prism.
4. The geometric light guide optical display system of claim 3, wherein: the second optical prisms are parallelogram prisms, the number of the second optical prisms is multiple, the second optical prisms are sequentially arranged from the first optical prism to the third optical prism and are tightly attached to form a prism array, partial reflection part transmission films are arranged between every two adjacent second optical prisms, and the partial reflection part transmission films are parallel to each other.
5. The geometric light guide optical display system of claim 4, wherein: the reflectivities of the partially reflective partially transmissive films in the direction from the first optical prism toward the third optical prism are R1, R2, and R3 … … Rn in this order, and satisfy 1% < R1 < R2 < R3 < … … < Rn < 99%.
6. The geometric light guide optical display system of claim 1, wherein: the reflecting mirror is a concave reflecting mirror, and the concave surface of the concave reflecting mirror faces the light splitting sheet.
7. The geometric light guide optical display system of claim 1, wherein: the number of the field lenses is multiple, and the multiple field lenses are sequentially arranged on a light-emitting light path of the display.
8. The geometric light guide optical display system of claim 4, wherein: a piece of the field lens close to the display is spaced from the center of the display by L1, which satisfies 0 < L1 < 20 mm.
9. The geometric light guide optical display system of claim 1, wherein: the distance between the field lens close to the light splitting sheet and the center of the light splitting sheet is L2, and the distance satisfies 0 & lt L2 & lt 30 mm.
10. The geometric light guide optical display system of claim 1, wherein: the center distance between the light splitting piece and the reflecting mirror is L3, and the center distance satisfies 0 & lt L3 & lt 30 mm.
11. The geometric light guide optical display system of claim 1, wherein: the distance between the center of the surface of one side of the light-splitting sheet close to the optical waveguide sheet and the center of the surface of one side of the optical waveguide sheet close to the light-splitting sheet is L4, which satisfies 5 < L4 < 35 mm.
12. The geometric light guide optical display system of claim 1, wherein: the acute angle formed by the light-emitting surface of the display and the light splitting sheet is theta1Which satisfies: theta < 15 DEG1＜60°。
13. A geometric light guide optical display system according to claim 3, 4 or 5, wherein: an acute angle formed by the light splitting piece and the surface of one side, close to the light splitting piece, of the first optical prism is theta2Which satisfies: theta is less than 5 DEG2＜85°。
14. A geometric light guide optical display system according to claim 3, 4 or 5, wherein: the both sides surface on the thickness direction of first optical prism is first optical surface and second optical surface respectively, first optical surface with the second optical surface is parallel to each other, be close to of first optical prism a side surface of beam splitter with the contained angle that first optical surface formed is the obtuse angle, be close to of first optical prism a side surface of beam splitter with the contained angle that second optical surface formed is acute angle theta3Which satisfies: theta is 10 DEG < theta3＜60°。
15. The geometric light guide optical display system of claim 14, wherein: the included angle formed by each partial reflection partial transmission film and the second optical surface from the first optical prism to the third optical prism direction and on one side close to the light splitting sheet are theta41、θ42、θ43……θ4nWhich satisfies: theta < 100 DEG41＜170°、100°＜θ42＜170°、100°＜θ43＜170°……100°＜θ4n＜170°。
16. The geometric light guide optical display system of claim 14, wherein: the included angle formed by each partial reflection partial transmission film and the second optical surface from the first optical prism to the third optical prism direction and on one side close to the light splitting sheet are theta41、θ42、θ43……θ4nWhich satisfies: theta is 10 DEG < theta41＜80°、10°＜θ42＜80°、10°＜θ43＜80°……10°＜θ4n＜80°。
17. A wearable device, characterized by: the geometric optical waveguide optical display system of any one of claims 1-16 comprising a wearing component and the geometric optical waveguide optical display system disposed on the wearing component.
CN202011148330.7A 2020-10-23 2020-10-23 Geometric optical waveguide optical display system and wearable equipment Pending CN112083576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011148330.7A CN112083576A (en) 2020-10-23 2020-10-23 Geometric optical waveguide optical display system and wearable equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011148330.7A CN112083576A (en) 2020-10-23 2020-10-23 Geometric optical waveguide optical display system and wearable equipment

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CN112083576A true CN112083576A (en) 2020-12-15

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CN202011148330.7A Pending CN112083576A (en) 2020-10-23 2020-10-23 Geometric optical waveguide optical display system and wearable equipment

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Country Link
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