CN215494361U - Near-to-eye display device - Google Patents
Near-to-eye display device Download PDFInfo
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- CN215494361U CN215494361U CN202121812124.1U CN202121812124U CN215494361U CN 215494361 U CN215494361 U CN 215494361U CN 202121812124 U CN202121812124 U CN 202121812124U CN 215494361 U CN215494361 U CN 215494361U
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Abstract
The embodiment of the utility model discloses a near-eye display device, which comprises an illumination system, wherein the illumination system comprises: the light source, the light modulator and the light splitting plate are arranged; the illumination light source is used for emitting a first light beam; the light splitting plate is positioned on a propagation path of the first light beam, and the first light beam is reflected by the light splitting plate to form a first polarized light beam; the light modulator is positioned on the propagation path of the first polarized light beam and is used for displaying an image; the first polarized light beam is reflected by the light modulator to form a second polarized light beam, and the polarization direction of the first polarized light beam is orthogonal to the polarization direction of the second polarized light beam; the light splitting plate is also positioned on the propagation path of the second polarized light beam and is used for transmitting the second polarized light beam. The lighting system adopts the light splitting plate with small volume and light weight instead of the glass prism, so that the volume and the weight of the lighting system can be reduced, and the near-to-eye display device is more compact and light.
Description
Technical Field
The embodiment of the utility model relates to the technical field of near-eye display, in particular to a near-eye display device.
Background
Augmented Reality (AR) technology is a technology that adds virtual graphics, images, videos, and other visual information to a real environment to increase the dimension of a user in recognizing surrounding objects and environments. The core of AR technology is near-eye display, a display mode in which a virtual image is projected through an optical system near the human eye. The core principle of near-eye display is the magnification and collimation of the microdisplay using an eyepiece optical system. Its specific application exists in but not limited to head-mounted display equipment, heads-up display and the like. Due to the small size and low weight requirements of users for the above two devices, the optical module is also more compact.
In the conventional illumination system for a near-eye display reflective display, a Polarization Beam Splitter (PBS) is generally used for polarizing and turning-back illumination of light, and glass is generally used as a carrier of a Polarization splitting film. Generally, the weight of the optical-mechanical illumination system accounts for more than 30% of the weight of the whole optical-mechanical, and the existence of the glass prism in the PBS introduces extra weight, which is not beneficial to the light weight of the optical-mechanical. Meanwhile, as the refractive index of the light beam in the illumination medium is larger than one, for the optical system with the same equivalent focal length, caliber and designed field angle, the total length of the illumination system can be increased by adding the illumination medium, so that the volume of the optical machine is increased, and the miniaturization of the optical machine system is hindered.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a near-to-eye display device, which aims to solve the problem that the existing optical-mechanical system is large in size and weight.
An embodiment of the present invention provides a near-eye display device, including: a lighting system, the lighting system comprising: the light source, the light modulator and the light splitting plate are arranged;
the illumination light source is used for emitting a first light beam;
the light splitting plate is positioned on a propagation path of the first light beam, and the first light beam is reflected by the light splitting plate to form a first polarized light beam;
the light modulator is positioned on the propagation path of the first polarized light beam and is used for displaying an image; the first polarized light beam is reflected by the light modulator to form a second polarized light beam, and the polarization direction of the first polarized light beam is orthogonal to the polarization direction of the second polarized light beam;
the light splitting plate is also positioned on the propagation path of the second polarized light beam and is used for transmitting the second polarized light beam.
Optionally, the light splitter comprises a planar light splitter or a curved light splitter.
Optionally, the light splitting plate includes a polarizer or a light splitting glass plate.
Optionally, the lighting system further includes a housing, and the light splitting plate is fixed in the housing.
Optionally, the near-eye display device further includes a collimation system, the collimation system is located on a propagation path of the second polarized light beam, and the second polarized light beam forms a collimated light beam after passing through the collimation system.
Optionally, the collimating system includes a polarization splitting prism, a first polarization conversion structure and a second polarization conversion structure, where the first polarization conversion structure and the second polarization conversion structure are located on two opposite sides of the polarization splitting prism;
the first polarization conversion structure comprises a first quarter-wave plate and a first reflector, and the second polarization conversion structure comprises a second quarter-wave plate and a second reflector;
the second polarized light beam is reflected by the polarization beam splitting prism, modulated by the first quarter wave plate, reflected by the first reflector and modulated by the first quarter wave plate again to form a third polarized light beam, and the polarization direction of the third polarized light beam is orthogonal to the polarization direction of the second polarized light beam;
the third polarized light beam is transmitted by the polarization beam splitter prism, modulated by the second quarter wave plate, reflected by the second reflecting mirror and then modulated by the second quarter wave plate again to form a fourth polarized light beam, and the polarization direction of the fourth polarized light beam is the same as that of the second polarized light beam;
and the fourth polarized light beam is reflected by the polarization beam splitter prism and then is emitted from the collimation system to form a collimated light beam.
Optionally, the first mirror includes a plane mirror, a spherical mirror, or an aspherical mirror;
the second reflecting mirror comprises a plane reflecting mirror, a spherical reflecting mirror or an aspheric reflecting mirror.
Optionally, the collimating system includes at least two collimating lenses, and the at least two collimating lenses are sequentially arranged along the optical axis direction;
and the second polarized light beam is collimated by the collimating system to form a collimated light beam.
Optionally, the at least two collimating lenses include a first collimating lens and a second collimating lens, and the first collimating lens and the second collimating lens are sequentially arranged along the optical axis direction;
the collimation system further comprises: a first wire grid, a second wire grid, a third quarter wave plate and a half wave plate; the first wire grating is arranged on the object side surface of the first lens, the third quarter wave plate is arranged on the image side surface of the first lens, the half wave plate is arranged on the object side surface of the second lens, and the second wire grating is arranged on the image side surface of the second lens;
the second polarized light beam is transmitted by the first linear grating, modulated by the third quarter wave plate, modulated by the half wave plate, reflected by the second linear grating, modulated by the half wave plate and modulated by the third quarter wave plate again to form a fifth polarized light beam, and the polarization direction of the fifth polarized light beam is orthogonal to the polarization direction of the second polarized light beam;
and the fifth polarized light beam is reflected by the first linear grating, modulated by the third quarter wave plate, modulated by the half wave plate and transmitted by the second linear grating in sequence and then is emitted from the collimation system to form a collimated light beam.
Optionally, the near-eye display device further includes an exit pupil expander, where the exit pupil expander is located on the propagation path of the collimated light beam, and is configured to expand the collimated light beam.
The near-eye display device provided by the embodiment of the utility model comprises an illumination system, wherein the illumination system comprises an illumination light source, a light modulator and a light splitting plate. The first light beam emitted by the illumination light source is reflected by the light splitting plate to form a first polarized light beam, the first polarized light beam is reflected by the light modulator to form a second polarized light beam orthogonal to the polarization direction of the first polarized light beam, and the second polarized light beam is emitted through the light splitting plate. The illuminating system of the near-eye display device adopts a light splitting plate with small volume and light weight instead of a glass prism, so that the volume and the weight of the illuminating system can be reduced, the near-eye display device is more compact and light, and the cost can be reduced; meanwhile, as the light beams are transmitted in the free space, the back intercept of the near-eye display device can be reduced, and the whole volume of the near-eye display device is further reduced.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic structural diagram of a near-eye display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an illumination system provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of another near-eye display device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another near-eye display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying 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 basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a near-eye display device according to an embodiment of the present invention, and as shown in fig. 1, the near-eye display device according to the embodiment of the present invention includes: illumination system 100, illumination system 100 comprising: an illumination light source 110, a light modulator 120, and a spectroscopic plate 130; the illumination source 110 is used for emitting a first light beam; the beam splitter 130 is located on a propagation path of the first light beam, and the first light beam is reflected by the beam splitter 130 to form a first polarized light beam; the light modulator 120 is located on a propagation path of the first polarized light beam for displaying an image; the first polarized light beam is reflected by the light modulator 120 to form a second polarized light beam, and the polarization direction of the first polarized light beam is orthogonal to the polarization direction of the second polarized light beam; the beam splitter 130 is also located in the propagation path of the second polarized light beam for transmitting the second polarized light beam.
Illustratively, referring to fig. 1, a near-eye display device provided by an embodiment of the present invention includes an illumination system 100, where the illumination system 100 includes an illumination source 110, a light modulator 120, and a beam splitter 130. The illumination source 110 emits a first light beam, which may be natural light or polarized light. Set up beam-splitting board 130 and be located the propagation path of first light beam, beam-splitting board 130 has the beam splitting function, has the function of selecting incident light beam polarization direction promptly, and beam-splitting board 130 can see through the P polarized light beam that satisfies preset polarization direction, reflects the S polarized light beam with the polarization direction quadrature of P polarized light beam simultaneously, and perhaps, beam-splitting board 130 can see through the S polarized light beam that satisfies preset polarization direction, reflects the P polarized light beam with the polarization direction quadrature of S polarized light beam simultaneously. When the first light beam is natural light, the beam splitter 130 selectively forms the first light beam into a first polarized light beam, and the first polarized light beam includes a P-polarized light beam or an S-polarized light beam. Taking the first polarized light beam as the P-polarized light beam as an example, the light modulator 120 is disposed on the propagation path of the first polarized light beam, and the light modulator 120 displays an image while changing the polarization state of the light beam incident thereon, for example, the light modulator 120 may be a Liquid Crystal On Silicon (LCOS) display. Specifically, the first polarized light beam is reflected by the light modulator 120 to form a second polarized light beam, a polarization direction of the second polarized light beam is orthogonal to a polarization direction of the first polarized light beam, and the second polarized light beam is an S polarized light beam. The beam splitter 130 is further disposed on the propagation path of the second polarized light beam, and the second polarized light beam, i.e., the S-polarized light beam, passes through the beam splitter 130.
It should be noted that the spectroscopic plate 130 provided in the embodiment of the present invention is a spectroscopic thin plate, and the thickness is usually less than 3 mm. The illumination system 100 adopts the beam splitter 130 instead of a glass prism, so that the volume and the weight of the illumination system 100 can be reduced, the near-eye display device is more compact and light, the production of a high-precision glass prism is avoided, and the overall cost of the near-eye display device can be reduced; meanwhile, as the light beams are transmitted in the free space, the back intercept of the near-eye display device can be reduced, and the whole volume of the near-eye display device is further reduced.
The near-eye display device provided by the embodiment of the utility model comprises an illumination system, wherein the illumination system comprises an illumination light source, a light modulator and a light splitting plate. The first light beam emitted by the illumination light source is reflected by the light splitting plate to form a first polarized light beam, the first polarized light beam is reflected by the light modulator to form a second polarized light beam orthogonal to the polarization direction of the first polarized light beam, and the second polarized light beam is emitted through the light splitting plate. The illuminating system of the near-eye display device adopts a light splitting plate with small volume and light weight instead of a glass prism, so that the volume and the weight of the illuminating system can be reduced, the near-eye display device is more compact and light, and the cost can be reduced; meanwhile, as the light beams are transmitted in the free space, the back intercept of the near-eye display device can be reduced, and the whole volume of the near-eye display device is further reduced.
Fig. 2 is a schematic structural diagram of an illumination system according to an embodiment of the present invention, and referring to fig. 1 and fig. 2, in order to further increase the design freedom of the illumination system 100, the beam splitter 130 may include a planar beam splitter (as shown in fig. 1) or a curved beam splitter (as shown in fig. 2). The curved surface of the curved surface light splitting plate can be a spherical surface, an aspheric surface, a free-form surface and the like. The radius of the curved surface may be pre-formed by injection molding or may be obtained by any other processing method. The curved light-splitting plate can further compress the light-emitting area of the illumination source 110 compared to the planar light-splitting plate, thereby improving the brightness.
Referring to fig. 1, the spectroscopic plate 130 may alternatively include a polarizing plate or a spectroscopic glass plate.
The light splitting plate 130 in this embodiment may be a polarizing plate such as a wire grid, or may be a light splitting glass plate, that is, a glass plate having a light splitting function, for example, the wire grid may be attached to one side surface of the glass plate to form a light splitting glass plate, and on this basis, an antireflection film for air may be further plated on one side surface of the light splitting glass plate to reduce ghost images and stray light.
Referring to fig. 1 and 2, optionally, the illumination system 100 further includes a housing 140, and the light-splitting plate 130 is fixed in the housing 140.
The light-splitting plate 130 is wrapped by an injection-molded housing, i.e., a housing 140, and the shape and position of the light-splitting plate 130 are supported by the housing 140 and form a fixed positional relationship with the illumination source 110 and the light modulator 120, so as to match the etendue.
Referring to fig. 1, on the basis of the above embodiment, optionally, the near-eye display device further includes a collimating system 200, where the collimating system 200 is located on a propagation path of the second polarized light beam, and the second polarized light beam forms a collimated light beam after passing through the collimating system 200.
The near-eye display device provided by the embodiment includes an illumination system 100 and a collimation system 200, wherein a second polarized light beam emitted from the illumination system 100 enters the collimation system 200, and forms a collimated light beam after being reflected and transmitted by the collimation system 200. The illumination system 100, in combination with the collimation system 200, presents a virtual image, captured by the human eye.
In the current near-eye display device, folding of an optical path and collimation and amplification of an image are generally realized by using a polarization splitting prism in combination with other optical elements, but light is generally transmitted and reflected once when propagating through the polarization splitting prism, and the folding capability of the optical path is not fully utilized, which is not beneficial to the light weight of the device. To solve the above problems, embodiments of the present invention provide a collimating system with a strong ability to fold an optical path on the basis of the above embodiments, so as to further reduce the volume and weight of a near-eye display device.
Exemplarily, referring to fig. 1, the collimating system 200 includes a polarization splitting prism 210, a first polarization conversion structure 220, and a second polarization conversion structure 230, the first polarization conversion structure 220 and the second polarization conversion structure 230 being located at two opposite sides of the polarization splitting prism 210; the first polarization conversion 220 structure includes a first quarter-wave plate 221 and a first mirror 222, and the second polarization conversion structure 230 includes a second quarter-wave plate 231 and a second mirror 232; the second polarized light beam is reflected by the polarization beam splitter prism 210, modulated by the first quarter wave plate 221, reflected by the first reflector 222, and modulated by the first quarter wave plate 221 again to form a third polarized light beam, wherein the polarization direction of the third polarized light beam is orthogonal to the polarization direction of the second polarized light beam; the third polarized light beam is transmitted by the polarization beam splitter prism 210, modulated by the second quarter wave plate 231, reflected by the second reflecting mirror 232, and modulated by the second quarter wave plate 231 again to form a fourth polarized light beam, wherein the polarization direction of the fourth polarized light beam is the same as the polarization direction of the second polarized light beam; the fourth polarized light beam is reflected by the polarization splitting prism 210 and then exits from the collimating system 200 to form a collimated light beam.
Specifically, the collimating system 200 includes a polarization splitting prism 210, a first polarization conversion structure 220 and a second polarization conversion structure 230, the first polarization conversion structure 220 and the second polarization conversion structure 230 are generally disposed on two opposite parallel surfaces of the polarization splitting prism 210, and the polarization splitting prism 210 includes a splitting film 211. Wherein the first polarization conversion structure 220 includes a first quarter wave plate 221 and a first mirror 222, and the second polarization conversion structure 230 includes a second quarter wave plate 231 and a second mirror 232. The first quarter wave plate 221 is attached to one side surface of the polarization splitting prism 210, the first reflecting mirror 222 is attached to one side surface of the first quarter wave plate 221 away from the polarization splitting prism 210, the second quarter wave plate 231 is attached to the other side surface of the polarization splitting prism 210, and the second reflecting mirror 232 is attached to one side surface of the second quarter wave plate 231 away from the polarization splitting prism 210.
Taking the second polarized light beam emitted from the illumination system 100 as the S-polarized light beam, the light splitting film 211 can transmit the P-polarized light beam satisfying the predetermined polarization direction, and reflect the S-polarized light beam orthogonal to the polarization direction of the P-polarized light beam. Specifically, the second polarized light beam is reflected by the light splitting film 211, modulated by the first quarter wave plate 221, reflected by the first reflector 222, and modulated by the first quarter wave plate 221 again to form a third polarized light beam. Because the second polarized light beam passes through the first quarter wave plate 221 twice, the emergent third polarized light beam has a certain phase difference with respect to the incident second polarized light beam, the polarization direction of the third polarized light beam is orthogonal to the polarization direction of the second polarized light beam, and the third polarized light beam satisfies the P polarized light beam. The third polarized light beam is transmitted by the polarization splitting film 211, modulated by the second quarter wave plate 231, reflected by the second reflecting mirror 232, and modulated by the second quarter wave plate 231 again to form a fourth polarized light beam. The third polarized light beam passes through the second quarter wave plate 231 twice, the emergent fourth polarized light beam has a certain phase difference with respect to the incident third polarized light beam, the polarization direction of the fourth polarized light beam is orthogonal to the polarization direction of the third polarized light beam, the polarization direction of the fourth polarized light beam is the same as the polarization direction of the second polarized light beam, and the fourth polarized light beam satisfies the S polarized light beam. The fourth polarized light beam is reflected by the light splitting film 211 and then exits from the collimating system 200 to form a collimated light beam.
In the collimation system 200 provided by the embodiment of the present invention, light is reflected twice and transmitted once on the splitting film 211 of the polarization splitting prism 210, so that the folding capability of the light path is improved, the light path is more compact, and the volume and weight of the collimation system 200 can be reduced. In addition, while the collimating system 200 provides collimated or nearly collimated light beams, the materials and curvature radii of the polarization beam splitter prism 210, the first polarization conversion structure 220 and the second polarization conversion structure 230 are designed to reduce aberration and improve image quality. The combination of the air illumination system 100 and the two anti-trans-collimation system 200 can further reduce the size and weight of the near-to-eye display device, and improve the long-term wearing comfort of the user.
Optionally, the first reflector 221 includes a plane reflector, a spherical reflector, or an aspheric reflector; the second mirror 222 includes a plane mirror, a spherical mirror, or an aspherical mirror.
In this embodiment, the types of the first reflector 221 and the second reflector 222 may be the same or different, and specifically, the first reflector 221 and the second reflector 222 may be both plane reflectors, spherical reflectors, aspheric reflectors, or any combination thereof.
Fig. 3 is a schematic structural diagram of another near-eye display device according to an embodiment of the present invention, as shown in fig. 3, optionally, the collimating system 200 includes at least two collimating lenses 240, and the at least two collimating lenses 240 are sequentially arranged along the optical axis direction; the second polarized beam is collimated by the collimating system 200 to form a collimated beam.
In this embodiment, the collimating system 200 may employ a collimating lens group. Specifically, the collimating system 200 includes at least two collimating lenses 240 arranged in sequence along the optical axis direction. The second polarized light beam emitted from the illumination system 100 enters the collimating system 200, and is modulated by the collimating lens 240 to form a collimated light beam. The number and type of the collimating lenses 240 are not limited, and those skilled in the art can set the collimating lenses according to actual requirements.
Further, fig. 4 is a schematic structural diagram of another near-eye display device according to an embodiment of the present invention, as shown in fig. 4, optionally, the at least two collimating lenses 240 include a first collimating lens 241 and a second collimating lens 242, and the first collimating lens 241 and the second collimating lens 242 are sequentially arranged along the optical axis direction; the collimation system 200 further comprises: a first wire grid 250, a second wire grid 260, a third quarter wave plate 270 and a half wave plate 280; the first wire grid 250 is disposed on the object side surface of the first lens 241, the third quarter-wave plate 270 is disposed on the image side surface of the first lens 241, the half-wave plate 280 is disposed on the object side surface of the second lens 242, and the second wire grid 260 is disposed on the image side surface of the second lens 242; the second polarized light beam is transmitted by the first linear grating 250, modulated by the third quarter wave plate 270, modulated by the half-wave plate 280, reflected by the second linear grating 260, modulated by the half-wave plate 280 and modulated by the third quarter wave plate 270 again to form a fifth polarized light beam, and the polarization direction of the fifth polarized light beam is orthogonal to the polarization direction of the second polarized light beam; the fifth polarized light beam is reflected by the first wire grid 250, modulated by the third quarter wave plate 270, modulated by the half wave plate 280, and transmitted by the second wire grid 260 in sequence, and then exits from the collimating system 200 to form a collimated light beam.
When the collimating system 200 adopts the collimating lens group, the light can be turned back for many times between the lens groups through reasonable coupling of the collimating lens group and the polarizing device, so that the volume of the light path is compressed. Illustratively, the collimating system 200 includes a first collimating lens 241 and a second collimating lens 242 arranged in sequence along the optical axis direction, and the collimating system 200 further includes a first linear grating 250, a second linear grating 260, a third quarter-wave plate 270, and a half-wave plate 280. The first wire grid 250 is attached to the object side surface of the first lens 241, the third quarter-wave plate 270 is attached to the image side surface of the first lens 241, the half-wave plate 280 is attached to the object side surface of the second lens 242, and the second wire grid 260 is attached to the image side surface of the second lens 242.
For example, the second polarized light beam is a P1 polarized light beam, the first wire grid 250 can transmit a P1 polarized light beam satisfying a predetermined polarization direction, and reflect an S polarized light beam orthogonal to the polarization direction of the P1 polarized light beam, and the second wire grid 260 can transmit a P2 polarized light beam satisfying the predetermined polarization direction, and reflect an S polarized light beam orthogonal to the polarization direction of the P2 polarized light beam. The vibration direction of the P1 polarized light beam and the polarization direction of the P2 polarized light beam have a certain phase difference.
Specifically, the second polarized light beam is sequentially transmitted by the first linear grating 250, modulated by the third quarter-wave plate 270, modulated by the half-wave plate 280, reflected by the second linear grating 260, modulated by the half-wave plate 280 again, and modulated by the third quarter-wave plate 270 to form a fifth polarized light beam. The second polarized light beam is modulated by the twice third quarter-wave plate 270 and the twice half-wave plate 280, the incident second polarized light beam and the emergent fifth polarized light beam have a certain phase difference, and the polarization state of the second polarized light beam is changed, so that the polarization direction of the fifth polarized light beam is orthogonal to the polarization direction of the second polarized light beam, and the fifth polarized light beam satisfies the S polarized light beam. After the fifth polarized light beam is reflected by the first wire grid 250, modulated by the third quarter-wave plate 270, and modulated by the half-wave plate 280 in sequence, the polarization state of the fifth polarized light beam is changed to form a P2 polarized light beam, the polarization direction of the P2 polarized light beam is orthogonal to the polarization direction of the fifth polarized light beam, and the P2 polarized light beam is transmitted by the second wire grid 260 and then emitted from the collimating system 200 to form a collimated light beam.
In the collimating system 200 provided by this embodiment, through reasonable coupling between the collimating lens groups and the polarizing device, light rays can be turned back for many times between the collimating lens groups, so that the volume of a light path is compressed, and the volume and weight of the collimating system are reduced; the combination of the air illumination system 100 and the collimation system 200 may further reduce the volume and weight of the near-eye display device, enabling a light weight design.
Referring to fig. 1, optionally, the near-eye display device further comprises an exit pupil expander 300, the exit pupil expander 300 being located in a propagation path of the collimated light beam for expanding the collimated light beam.
The collimation system 200 is used in combination with the exit pupil expander 300 to present a virtual image. Specifically, the collimated light beam emitted from the collimating system 200 enters the exit pupil expander 300, and is totally reflected in the exit pupil expander 300 for multiple times, and the exit pupil expander 300 is provided with a plurality of reflecting surfaces 310, so that the light beam is reflected by the reflecting surfaces 310, the original total reflection is broken, and the light beam is emitted vertically downward, thereby expanding the collimated light beam and increasing the field angle. Wherein the exit pupil expander 300 can be a geometric optical waveguide, a diffractive optical waveguide, or any other element that can achieve beam expansion.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A near-eye display device, comprising: a lighting system, the lighting system comprising: the light source, the light modulator and the light splitting plate are arranged;
the illumination light source is used for emitting a first light beam;
the light splitting plate is positioned on a propagation path of the first light beam, and the first light beam is reflected by the light splitting plate to form a first polarized light beam;
the light modulator is positioned on the propagation path of the first polarized light beam and is used for displaying an image; the first polarized light beam is reflected by the light modulator to form a second polarized light beam, and the polarization direction of the first polarized light beam is orthogonal to the polarization direction of the second polarized light beam;
the light splitting plate is also positioned on the propagation path of the second polarized light beam and is used for transmitting the second polarized light beam.
2. The near-eye display device of claim 1 wherein the beamsplitter comprises a planar beamsplitter or a curved beamsplitter.
3. The near-eye display device of claim 1 wherein the beamsplitter comprises a polarizer or a dichroic glass plate.
4. The near-eye display device of claim 1 wherein the illumination system further comprises a housing, the beamsplitter secured within the housing.
5. The near-eye display device of claim 1 further comprising a collimating system in a propagation path of the second polarized light beam, the second polarized light beam forming a collimated light beam after passing through the collimating system.
6. The near-eye display device of claim 5 wherein the collimating system comprises a polarization splitting prism, a first polarization conversion structure and a second polarization conversion structure, the first polarization conversion structure and the second polarization conversion structure being located on opposite sides of the polarization splitting prism;
the first polarization conversion structure comprises a first quarter-wave plate and a first reflector, and the second polarization conversion structure comprises a second quarter-wave plate and a second reflector;
the second polarized light beam is reflected by the polarization beam splitting prism, modulated by the first quarter wave plate, reflected by the first reflector and modulated by the first quarter wave plate again to form a third polarized light beam, and the polarization direction of the third polarized light beam is orthogonal to the polarization direction of the second polarized light beam;
the third polarized light beam is transmitted by the polarization beam splitter prism, modulated by the second quarter wave plate, reflected by the second reflecting mirror and then modulated by the second quarter wave plate again to form a fourth polarized light beam, and the polarization direction of the fourth polarized light beam is the same as that of the second polarized light beam;
and the fourth polarized light beam is reflected by the polarization beam splitter prism and then is emitted from the collimation system to form a collimated light beam.
7. The near-eye display device of claim 6 wherein the first mirror comprises a planar mirror, a spherical mirror, or an aspheric mirror;
the second reflecting mirror comprises a plane reflecting mirror, a spherical reflecting mirror or an aspheric reflecting mirror.
8. The near-eye display device of claim 5 wherein the collimating system comprises at least two collimating lenses, at least two of the collimating lenses being arranged in series along the optical axis;
and the second polarized light beam is collimated by the collimating system to form a collimated light beam.
9. The near-eye display device of claim 8, wherein at least two of the collimating lenses comprise a first collimating lens and a second collimating lens, the first collimating lens and the second collimating lens being arranged in order along an optical axis direction;
the collimation system further comprises: a first wire grid, a second wire grid, a third quarter wave plate and a half wave plate; the first wire grating is arranged on the object side surface of the first collimating lens, the third quarter wave plate is arranged on the image side surface of the first collimating lens, the half wave plate is arranged on the object side surface of the second collimating lens, and the second wire grating is arranged on the image side surface of the second collimating lens;
the second polarized light beam is transmitted by the first linear grating, modulated by the third quarter wave plate, modulated by the half wave plate, reflected by the second linear grating, modulated by the half wave plate and modulated by the third quarter wave plate again to form a fifth polarized light beam, and the polarization direction of the fifth polarized light beam is orthogonal to the polarization direction of the second polarized light beam;
and the fifth polarized light beam is reflected by the first linear grating, modulated by the third quarter wave plate, modulated by the half wave plate and transmitted by the second linear grating in sequence and then is emitted from the collimation system to form a collimated light beam.
10. The near-eye display device of claim 5 further comprising an exit pupil expander located in a propagation path of the collimated light beam for expanding the collimated light beam.
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| CN202121812124.1U CN215494361U (en) | 2021-08-04 | 2021-08-04 | Near-to-eye display device |
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