CN112711139B - Near-to-eye display device and optical system thereof - Google Patents
Near-to-eye display device and optical system thereof Download PDFInfo
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- CN112711139B CN112711139B CN202110004082.7A CN202110004082A CN112711139B CN 112711139 B CN112711139 B CN 112711139B CN 202110004082 A CN202110004082 A CN 202110004082A CN 112711139 B CN112711139 B CN 112711139B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
Abstract
An optical system applicable to a near-eye display device and having high light transmittance comprises a display unit, a lens, a reflective polarizer, a wave retarder and a half-mirror. Wherein, the half-penetration reflecting mirror or the display unit is provided with a grating layer, the grating layer comprises a plurality of light transmission areas and a plurality of light reflection areas, the plurality of light transmission areas are used for directly transmitting the image light, and the plurality of light reflection areas are used for reflecting the light reflected by the reflection polarizer; therefore, the optical system has higher light transmittance and further obtains higher light utilization rate.
Description
Technical Field
The present invention relates to the field of optical systems, and more particularly to an optical system for a near-eye display device.
Background
Optical technologies related to Virtual Reality (VR) and Augmented Reality (AR) have received much attention in recent years, and have been developed at a relatively rapid rate; in addition, the product has diverse application potential in real life, and products or services achieved by virtual reality and augmented reality technology can be seen in the fields of entertainment, medicine, home furnishing, military affairs and the like.
Further, examples of applications for virtual reality and augmented reality include various types of display devices, such as: a near-eye display device or a head-mounted display (HMD). The so-called near-eye display device, which is similar to glasses in shape and can also be called glasses type display, image glasses or head-mounted display device, mainly comprises a housing and an optical system installed in the housing; in order to achieve a good optical effect and to achieve the advantage of light weight, the details of the optical system are important in the field.
As for the optical system included in the current common near-eye display device, the optical system in the optical perspective form is one of the common technologies; the display device is generally provided with a display unit, an optical lens assembly and a partial transmission assembly, wherein the partial transmission assembly can be a spectroscope, a half-mirror or a half-mirror glass, and is mainly used for transmitting and reflecting light after the phase is changed, so as to further achieve the purpose of folding the light path.
FIG. 1 is a schematic cross-sectional view of a conventional optical system, referring to FIG. 1. In a conventional optical system, a display unit 101 is disposed toward a human eye 109 of a user, and a linear polarization layer 102 and a wave retardation layer 103 are disposed on a surface of the display unit 101 facing the human eye 109, wherein the linear polarization layer 102 is disposed between the wave retardation layer 103 and a surface of the display unit 101; a conventional half mirror 104, a wave retarder 105, a reflective polarizer 106, a lens 107 and a linear polarizer 108 are disposed in the direction from the display unit 101 to the human eye 109; in the optical path, an image light 110 is emitted from the display unit 101 toward the human eye 109, forms a circular polarization state through the linear polarization layer 102 and the wave retardation layer 103, then partially penetrates the half mirror 104, and is reflected as a first reflected light 111 by the reflective polarizer 106; then, the first reflected light 111 is reflected by the half mirror 104 as a second reflected light 112, and further penetrates to reach the human eye 109. Specifically, the transmittance and reflectance of the half-mirror 104 provided in the conventional optical system are both about 50% as a whole; thus, the light intensity that actually reaches the human eye 109 may only be left by about a quarter, with significantly lower light utilization.
Accordingly, it can be understood that in the related fields of virtual reality and augmented reality, and even in the application related to near-eye display devices, an optical system with higher light utilization rate is needed to further improve the use experience.
Disclosure of Invention
This summary is provided to provide a simplified summary of the invention in order to provide a basic understanding to the reader. This summary is not an extensive overview of the disclosure and is intended to neither identify key or critical elements of the embodiments nor delineate the scope of the invention.
In view of the foregoing, the present inventors have made many years of experience in manufacturing and developing related industries to provide a near-eye display device with improved light transmittance and an optical system thereof. The inventor of the present invention has found that by changing the arrangement of the metal layer for reflecting light, the light path can be substantially folded and the light can still reach the eyes of the user with higher intensity; thereby achieving the purpose of improving the light utilization rate of the optical system.
Accordingly, in some aspects of the present invention, an optical system is provided that includes a display unit, a lens, a reflective polarizer, a wave retarder, and a half-mirror. The display unit comprises a plurality of display areas for emitting image light towards human eyes, and a plurality of shading areas are arranged among the plurality of display areas; and the lens is arranged between human eyes and the display unit; the reflective polarizer is arranged between the lens and the display unit; the wave retarder is arranged between the reflection polarizer and the display unit, and the half-penetration reflecting mirror is arranged between the wave retarder and the display unit; the transflective mirror is provided with a grating layer on one surface facing human eyes, the grating layer further comprises a plurality of light transmitting areas and a plurality of light reflecting areas, the plurality of light transmitting areas are used for allowing image light to directly penetrate through, and the plurality of light reflecting areas are provided with a plurality of metal layers on one surface of the transflective mirror facing human eyes.
According to some embodiments of the present invention, the plurality of light-transmitting areas and the plurality of display areas are disposed correspondingly, and the plurality of light-reflecting areas and the plurality of light-shielding areas are disposed correspondingly.
According to some embodiments of the present invention, a linear polarizer is further disposed between the lens and the human eye, and a transmission axis of the linear polarizer is parallel to a transmission axis of the reflective polarizer.
According to some embodiments of the present invention, a side of the plurality of metal layers facing the human eye has a curvature.
According to some embodiments of the present invention, the display unit has a light emitting surface facing the human eye, the surface of the light emitting surface has a wave retardation layer, and a linear polarization layer is disposed between the wave retardation layer and the light emitting surface.
In some aspects of the present invention, an optical system is provided that includes a display unit, a lens, a reflective polarizer, and a wave retarder. The display unit comprises a plurality of display areas for emitting image light towards human eyes, and a plurality of shading areas are arranged among the plurality of display areas; the lens is arranged between human eyes and the display unit; the reflective polarizer is arranged between the lens and the display unit; the wave retarder is arranged between the reflection polarizer and the display unit; the display unit is provided with a wave delay layer on one side facing human eyes, a linear polarization layer is arranged between the wave delay layer and the light emergent surface, a grating layer is arranged on one side of the wave delay layer facing human eyes, the grating layer further comprises a plurality of light transmission areas and a plurality of light reflection areas, the plurality of light transmission areas are used for enabling image light to directly penetrate through, and a plurality of metal layers are arranged on one side of the light reflection areas facing human eyes.
According to some embodiments of the present invention, the plurality of light-transmitting areas and the plurality of display areas are disposed correspondingly, and the plurality of light-reflecting areas and the plurality of light-shielding areas are disposed correspondingly.
According to some embodiments of the present invention, a linear polarizer is further disposed between the lens and the human eye, and a transmission axis of the linear polarizer is parallel to a transmission axis of the reflective polarizer.
According to some embodiments of the present invention, a side of the plurality of metal layers facing the human eye has a curvature.
In some aspects of the invention, a near-eye display device is provided that includes a housing that includes a display, a lens, a reflective polarizer, a wave retarder, and a half-mirror within the housing. The display is used for emitting image light towards human eyes and comprises a plurality of pixel units, and a plurality of black matrixes are arranged among the pixel units; on the other hand, the lens is arranged between human eyes and the display unit; the reflective polarizer is arranged between the lens and the display unit; the wave retarder is arranged between the reflection polarizer and the display unit, and the half-penetration reflecting mirror is arranged between the wave retarder and the display unit; the transflective mirror is provided with a grating layer on one side facing human eyes, the grating layer further comprises a plurality of light transmitting areas and a plurality of light reflecting areas, the plurality of light transmitting areas are used for allowing image light to directly penetrate through, and the plurality of light reflecting areas are provided with a plurality of metal layers on one side of the transflective mirror facing the human eyes.
According to some embodiments of the present invention, the plurality of light-transmitting areas are disposed corresponding to the plurality of pixel units, and the plurality of light-reflecting areas are disposed corresponding to the plurality of black matrices.
According to some embodiments of the present invention, a side of the plurality of metal layers facing the human eye has a curvature.
In some aspects of the invention, a near-eye display device is provided that includes a housing that includes a display, a lens, a reflective polarizer, and a wave retarder. The display is used for emitting image light towards human eyes and comprises a plurality of pixel units, and a plurality of black matrixes are arranged among the pixel units; on the other hand, the lens is arranged between human eyes and the display unit; the reflective polarizer is arranged between the lens and the display unit; the wave retarder is arranged between the reflection polarizer and the display unit; the display unit is provided with a wave delay layer on one side facing human eyes, a linear polarization layer is arranged between the wave delay layer and the light emergent surface, a grating layer is arranged on one side of the wave delay layer facing human eyes, the grating layer further comprises a plurality of light transmission areas and a plurality of light reflection areas, the plurality of light transmission areas are used for enabling image light to directly penetrate through, and a plurality of metal layers are arranged on one side of the light reflection areas facing human eyes.
According to some embodiments of the present invention, the plurality of light-transmitting areas are disposed corresponding to the plurality of pixel units, and the plurality of light-reflecting areas are disposed corresponding to the plurality of black matrices.
According to some embodiments of the present invention, a side of the plurality of metal layers facing the human eye has a curvature.
Drawings
FIG. 1 is a schematic cross-sectional view of a conventional optical system;
FIG. 2A is a schematic cross-sectional view of an optical system according to an embodiment of the present invention;
2B-2E are schematic microscopic views of the area of FIG. 2B according to the present invention;
fig. 2F is a schematic cross-sectional view of a near-eye display device according to an embodiment of the invention;
FIG. 3A is a schematic cross-sectional view of an optical system according to an embodiment of the present invention;
FIGS. 3B-3E are schematic microscopic views of the area B in FIG. 3A, according to the present invention;
fig. 3F is a schematic cross-sectional view of a near-eye display device according to an embodiment of the invention.
In accordance with conventional practice, the various features and elements of the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the particular features and elements of the invention in order to best explain the principles of the invention. Moreover, the same or similar reference numbers will be used throughout the drawings to refer to similar components and parts.
Reference numerals:
101,201,301 display unit
102,202,302 linear polarizing layer
103,203,303 wave retardation layer
104 semi-transparent semi-reflecting mirror
105,205,304 wave retarder
106,206,305 reflective polarizer
107,207,306 lenses
108,208,307 Linear polarizers
109,209,308 human eye
110,210,310 image light
111,211,311 first reflected light
112,212,312 second reflected light
204 semi-penetrating lens
220,320 light-shielding area
221,321 display area
230,330 flat metal layer
231,331 bump metal layer
240,340 light-transmitting region
250,350 reflective light region
260,360 casing
Detailed Description
While the present invention has been described in considerable detail with reference to certain preferred versions and embodiments thereof, it should be understood that the present invention is not limited to the disclosed versions and embodiments, but rather, is capable of other forms. In this specification and in the claims that follow, "a" and "the" are to be construed as a plurality unless the context clearly dictates otherwise. Furthermore, in this specification and the claims that follow, unless otherwise indicated, the term "disposed on" or "disposed on" may be considered as directly or indirectly attached or otherwise in contact with a surface of something, the definition of which should be determined from the context of the specification, both in the front and back/paragraph terms, and the general knowledge of the art to which this specification pertains.
Although numerical ranges and parameters setting forth the invention are approximate, numerical values associated with the embodiments are presented herein as precisely as possible. Any numerical value, however, inherently contains certain standard deviations found in their respective testing measurements. As used herein, "about" generally refers to actual values within plus or minus 10%, 5%, 1%, or 0.5% of a particular value or range. Alternatively, the term "about" indicates that the actual value falls within the acceptable standard error of the mean, and is considered by one of ordinary skill in the art. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At the very least, these numerical parameters are to be understood as meaning the number of significant digits recited and the number resulting from applying ordinary carry notation.
To solve the problems found by the inventor of the present invention based on the prior art, the light transmittance is increased to achieve the purpose of increasing the light utilization rate of the optical system of the near-eye display device; the present invention provides a novel optical system in an embodiment. The novel optical system is provided with the metal layers in different modes on the surfaces of different components, so that the light transmittance is improved.
Examples
FIG. 2A is a schematic cross-sectional view of an optical system according to an embodiment of the present invention; referring to fig. 2A, the present embodiment provides an optical system. In the optical system, a display unit 201 facing human eyes 209 is arranged; preferably, a linear polarization layer 202 and a wave retardation layer 203 are further disposed on a surface of the display unit 201 facing the human eye 209; moreover, the optical system is provided with a half-mirror 204, a wave retarder 205, a reflective polarizer 206 and a lens 207 in sequence between the display unit 201 and the human eye 209 in the direction of the human eye 209; preferably, a linear polarizer 208 is further disposed between the lens 207 and the human eye 209 for improving the contrast of the image.
Further, the linear polarization layer 202 may be in the form of a sheet or a film, and the material thereof is a polymer material or glass; the wave retardation layer 203 may also be called a wave plate, and is mostly made of uniaxial crystal; preferably, a quarter-wave plate can be used in the present embodiment. On the other hand, the wave retarder 205 and the linear polarizer 208 also function according to the same principle, so it is understood that the wave retarder 205 may also employ a quarter-wave plate. It should be noted that the linear polarization layer 202 and the wave retardation layer 203 are disposed to convert the light emitted from the display unit 201 into light having a circularly polarized state; thus, conventionally, a single or plural components that can achieve the same effect can be used as an alternative to the linear polarization layer 202 and the wave retardation layer 203.
Still further, the material of the lens 207 may be poly (methyl methacrylate), PMMA, or a Cyclic Olefin Copolymer (COC); and preferably, the lens 207 is a convex-concave lens.
In terms of the optical path, an image light 210 is emitted from the display unit 201 toward the human eye 209 (in the + Z direction according to the figure), and the image light 210 shows a circularly polarized light state after passing through the linear polarization layer 202 and the wave retardation layer 203. Then, the image light 210 passes through the half-mirror 204 and the wave retarder 205, and then the phase is converted into a linearly polarized light state, and further reaches the reflective polarizer 206; the image light 210 is reflected by the reflective polarizer 206 as a first reflected light 211, and the first reflected light 211 passes through the wave retarder 205 along the-Z direction and then again assumes a circularly polarized state, and is reflected by the half-mirror 204 as a second reflected light 212; finally, the second reflected light 212 passes through the wave retarder 205, the reflective polarizer 206, the lens 207, and the linear polarizer 208 along the + Z direction and reaches the human eye 209.
FIGS. 2B-2E are schematic microscopic views of the area B in FIG. 2A, please refer to FIGS. 2A-2E together. The display unit 201 is provided with a plurality of display areas 221 and a plurality of shading areas 220 arranged among the plurality of display areas 221; specifically, the plurality of display regions 221 may be formed by pixels or sub-pixels for emitting the image light 210 to the human eye 209; the light-shielding areas 220 may be a metal black matrix, a resin black matrix, or a graphite black matrix, and are used for generating light-shielding properties and separating pixels/sub-pixels.
Referring to fig. 2A-2E, the half mirror 204 may be made of polymethyl methacrylate (PMMA) or Cyclic Olefin Copolymer (COC). On the other hand, the half-mirror 204 is provided with a grating layer 245 on a side facing the human eye 209, the grating layer 245 is further provided with a plurality of light-transmitting areas 240 and a plurality of light-reflecting areas 250, the plurality of light-transmitting areas are used for allowing the image light 210 to directly penetrate through, and the penetration rate is preferably close to 100%; the plurality of reflective regions 250 are used for reflecting the first reflective light 211, and a plurality of metal layers are disposed on a surface of the transflective mirror 204 facing human eyes of the plurality of reflective regions 250.
For some embodiments of the present invention, the plurality of light-transmitting areas 240 are disposed corresponding to the plurality of display areas 221, and the plurality of light-reflecting areas 250 are disposed corresponding to the plurality of light-shielding areas 220 (as shown in fig. 2B-2C). Specifically, the plurality of metal layers are substantially a plurality of flat metal layers 230 (shown in fig. 2B); in various embodiments, a side of the metal layers facing the human eye has a curvature, and further, a side of the metal layers facing the human eye protrudes toward the human eye; preferably, the plurality of metal layers are a plurality of bump metal layers 231 (as shown in fig. 2C) including a plurality of bump structures, and the plurality of bump metal layers 231 are made of metal, or are made by disposing corresponding metal layers on the surfaces of the plurality of microlens structures. In addition, a person skilled in the art can make slight adjustments and dispose a portion of the plurality of metal layers corresponding to the plurality of display regions 221, thereby avoiding the concern of moire (moire patterns) caused by the complete correspondence between the plurality of display regions 221 and the transparent regions 240 (as shown in fig. 2D-2E); similarly, the reflective regions 250 are formed on a surface of the half-mirror 204 facing the human eye, and are substantially formed by a plurality of flat metal layers 230 (as shown in fig. 2D) or a plurality of bump metal layers 231 (as shown in fig. 2E) including a plurality of bump structures.
Fig. 2F is a schematic cross-sectional view of a near-eye display device according to an embodiment of the invention; referring to fig. 2A-2F together, the near-eye display device includes a housing 260, and the housing 260 is used for accommodating the optical system of the above embodiment. Specifically, the housing 260 may be a variety of common forms for manufacturing a near-eye display device, and the invention is not limited thereto; on the other hand, in the near-eye display device, the display unit 201 is substantially a display; the plurality of display regions 221 are substantially a plurality of pixel units; the light-shielding regions 220 are substantially black matrices.
FIG. 3A is a schematic cross-sectional view of an optical system according to an embodiment of the present invention; referring to fig. 3A, the present embodiment provides an optical system. In the optical system, a display unit 301 facing human eyes 308 is arranged; preferably, a linear polarization layer 302 and a wave retardation layer 303 are further disposed on a side of the display unit 301 facing the human eyes 308; in addition, the optical system is sequentially provided with a wave retarder 304, a reflective polarizer 305 and a lens 306 between the display unit 301 and the human eye 308 toward the direction of the human eye 308; preferably, a linear polarizer 307 is further disposed between the lens 306 and the human eye 308 to enhance the contrast of the image.
Further, the linear polarization layer 302 may be in the form of a sheet or a film, and the material thereof is a polymer material or glass; the wave retardation layer 303 may also be called a wave plate, and is mostly made of uniaxial crystal; preferably, a quarter-wave plate can be used in the present embodiment. On the other hand, the wave retarder 304 and the linear polarizer 307 also function according to the same principle, so it is understood that the wave retarder 304 may also employ a quarter-wave plate. It should be noted that the linear polarization layer 302 and the wave retardation layer 303 are provided for the purpose of converting light emitted from the display unit 301 into light having a circularly polarized state; therefore, a single or plural components, which are commonly used to achieve the same effect, can be used as an alternative to the linear polarization layer 302 and the wave retardation layer 303.
Still further, the material of the lens 306 can be poly (methyl methacrylate), PMMA, or a Cyclic Olefin Copolymer (COC); and preferably, the lens 306 is a convex-concave lens.
In terms of the optical path, an image light 310 is emitted from the display unit 301 toward the human eye 308 (in the + Z direction according to the figure), and the image light 310 is in a circularly polarized state after passing through the linear polarization layer 302 and the wave retardation layer 303. Then, after the image light 310 passes through the wave retarder 304, the phase is converted into a linearly polarized light state, and further reaches the reflective polarizer 305; the image light 310 is reflected by the reflective polarizer 305 as a first reflected light 311, and the first reflected light 311 passes through the wave retarder 304 along the-Z direction and then exhibits a circularly polarized light state again, and is reflected by the wave retardation layer 303 as a second reflected light 312; finally, the second reflected light 312 passes through the wave retarder 304, the reflective polarizer 305, the lens 306, and the linear polarizer 307 along the + Z direction to reach the human eye 308.
Fig. 3B-3E are schematic microscopic views of the area B in fig. 3A, please refer to fig. 3A-3E together. The display unit 301 has a plurality of display regions 321 and a plurality of light-shielding regions 320 disposed between the plurality of display regions 321; specifically, the plurality of display regions 321 may be composed of pixels or sub-pixels for emitting the image light 310 to the human eye 308; the light-shielding region 320 may be a metal black matrix, a resin black matrix, or a graphite black matrix, and is used to generate light-shielding property and separate pixels/sub-pixels.
Referring to fig. 3A to 3E together, a grating layer 345 is disposed on a surface of the wave retardation layer 303 facing the human eye 308, the grating layer 345 further has a plurality of light-transmitting regions 340 and a plurality of light-reflecting regions 350, the plurality of light-transmitting regions are used for allowing the image light 310 to directly penetrate therethrough, and the transmittance thereof is preferably close to 100%; the plurality of reflective light regions 350 are used for reflecting the first reflected light 311, and a plurality of metal layers are disposed on one surface of the wave retardation layer 303 facing human eyes of the plurality of reflective light regions 350. In the present embodiment, the grating layer 345 is directly disposed on the wave retarder 303, so that it is not necessary to additionally add a half-mirror or a lens between the display unit 301 and the wave retarder 304; accordingly, the device or system manufactured according to the concept of the present embodiment can not only reduce the manufacturing cost thereof, but also reduce the volume of the completed device or system.
For some embodiments of the present invention, the plurality of light-transmitting areas 340 are disposed corresponding to the plurality of display areas 321, and the plurality of light-reflecting areas 350 are disposed corresponding to the plurality of light-shielding areas 320 (as shown in fig. 3B-3C); specifically, the plurality of metal layers are substantially a plurality of flat metal layers 330 (as shown in fig. 3B); in various embodiments, a side of the metal layers facing the human eye has a curvature, and further, a side of the metal layers facing the human eye protrudes toward the human eye; preferably, the plurality of metal layers are a plurality of bump metal layers 331 (as shown in fig. 3C) including a plurality of bump structures, and the plurality of bump metal layers 331 are made of metal, or are made by disposing corresponding metal layers on the surfaces of the plurality of microlens structures. In addition, a person skilled in the art can make slight adjustments and dispose a portion of the plurality of metal layers corresponding to the plurality of display regions 321, so as to avoid the doubt that moire (moire patterns) is caused by the complete correspondence between the plurality of display regions 321 and the light-transmitting regions 340 (as shown in fig. 3D-3E); similarly, the plurality of reflective light regions 350 are disposed on a surface of the wave retardation layer 303 facing human eyes, and are substantially a plurality of flat metal layers 330 (as shown in fig. 3D) or a plurality of bump metal layers 331 (as shown in fig. 3E) including a plurality of bump structures.
Fig. 3F is a schematic cross-sectional view of a near-eye display device according to an embodiment of the invention; referring to fig. 3A-3F together, the near-eye display device includes a housing 360, and the housing 360 is used for accommodating the optical system of the above-mentioned embodiment. Specifically, the housing 360 may be various patterns that are common in the manufacturing of near-eye display devices, and the invention is not limited thereto; on the other hand, in the near-eye display device, the display unit 301 is substantially a display; the plurality of display areas 321 are substantially a plurality of pixel units; the light-shielding regions 320 are substantially black matrices.
It can be understood from the above description that, by implementing the present invention, the image light can still maintain an intensity close to 100% when it is reflected for the first time, and can still maintain an intensity close to 50% when it is reflected again and reaches the human eye, which can achieve a light utilization rate about 2 times that of the prior art. In addition, based on the technical feature that the grating layer 345 is directly disposed on the wave delay layer 303, in this embodiment, a half-mirror or a lens does not need to be additionally disposed between the display unit 301 and the wave delay 304; accordingly, the device or system manufactured according to the concept of the present embodiment can not only reduce the manufacturing cost thereof, but also reduce the volume of the completed device or system.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (11)
1. An optical system, comprising:
a display unit including a plurality of display areas for emitting image light toward human eyes, and a plurality of light-shielding areas between the plurality of display areas;
a lens disposed between a human eye and the display unit;
a reflective polarizer disposed between the lens and the display unit;
a wave retarder disposed between the reflective polarizer and the display unit; and
a half-mirror disposed between the wave retarder and the display unit;
the transflective mirror is provided with a grating layer on one surface facing human eyes, the grating layer comprises a plurality of light transmitting areas and a plurality of light reflecting areas, the plurality of light transmitting areas are used for allowing image light to directly penetrate through, and the plurality of light reflecting areas are provided with a plurality of metal layers on one surface facing human eyes of the transflective mirror;
wherein, one side of the metal layers facing to human eyes has a curvature; a part of the plurality of metal layers is arranged corresponding to the plurality of display areas.
2. The optical system of claim 1, wherein the plurality of light-transmitting areas are disposed corresponding to the plurality of display areas, and the plurality of light-reflecting areas are disposed corresponding to the plurality of light-blocking areas.
3. The optical system of claim 1, wherein a linear polarizer is disposed between the lens and the human eye, and a transmission axis of the linear polarizer is parallel to a transmission axis of the reflective polarizer.
4. The optical system as claimed in claim 1, wherein the display unit has a light-emitting surface facing the human eye, the surface of the light-emitting surface is provided with a wave retardation layer, and a linear polarization layer is disposed between the wave retardation layer and the light-emitting surface.
5. An optical system, comprising:
a display unit including a plurality of display areas for emitting image light toward human eyes, and a plurality of light-shielding areas between the plurality of display areas;
a lens disposed between a human eye and the display unit;
a reflective polarizer disposed between the lens and the display unit; and
a wave retarder disposed between the reflective polarizer and the display unit;
the display unit is provided with a wave delay layer on one side facing human eyes, a light-emitting surface is arranged on the display unit facing the human eyes, a linear polarization layer is arranged between the wave delay layer and the light-emitting surface, a grating layer is arranged on one side of the wave delay layer facing the human eyes, the grating layer comprises a plurality of light transmission areas and a plurality of light reflection areas, the plurality of light transmission areas are used for allowing image light to directly penetrate through, and the light reflection areas are provided with a plurality of metal layers on one side facing the human eyes;
wherein, one side of the metal layers facing to human eyes has a curvature; a part of the plurality of metal layers is arranged corresponding to the plurality of display areas.
6. The optical system as claimed in claim 5, wherein the plurality of light transmissive areas are disposed corresponding to the plurality of display areas, and the plurality of light reflective areas are disposed corresponding to the plurality of light blocking areas.
7. The optical system of claim 5, wherein a linear polarizer is disposed between the lens and the human eye, and a transmission axis of the linear polarizer is parallel to a transmission axis of the reflective polarizer.
8. A near-eye display device comprising a housing, the housing comprising:
the display is used for emitting image light to human eyes and comprises a plurality of pixel units, and a plurality of black matrixes are arranged among the pixel units;
a lens disposed between a human eye and the display;
a reflective polarizer disposed between the lens and the display;
a wave retarder disposed between the reflective polarizer and the display; and
a half-mirror disposed between the wave retarder and the display;
the transflective mirror is provided with a grating layer on one surface facing human eyes, the grating layer comprises a plurality of light transmitting areas and a plurality of light reflecting areas, the plurality of light transmitting areas are used for allowing image light to directly penetrate through, and the plurality of light reflecting areas are provided with a plurality of metal layers on one surface facing human eyes of the transflective mirror;
wherein, one side of the metal layers facing to human eyes has a curvature; a part of the plurality of metal layers is arranged corresponding to a plurality of display areas of the display.
9. The near-eye display device of claim 8, wherein the plurality of light-transmissive regions are disposed corresponding to the plurality of pixel units, and the plurality of light-reflective regions are disposed corresponding to the plurality of black matrices.
10. A near-eye display device comprising a housing, the housing comprising:
the display is used for emitting image light to human eyes and comprises a plurality of pixel units, and a plurality of black matrixes are arranged among the pixel units;
a lens disposed between a human eye and the display;
a reflective polarizer disposed between the lens and the display; and
a wave retarder disposed between the reflective polarizer and the display;
the display is provided with a wave delay layer on one side facing human eyes, a light-emitting surface on one side facing human eyes, a linear polarization layer between the wave delay layer and the light-emitting surface, and a grating layer on one side facing human eyes, wherein the grating layer comprises a plurality of light-transmitting areas and a plurality of light-reflecting areas, the plurality of light-transmitting areas are used for allowing image light to directly penetrate through, and the light-reflecting areas are provided with a plurality of metal layers on one side facing human eyes;
wherein the side of the metal layers facing the human eye has a curvature; a part of the plurality of metal layers is arranged corresponding to a plurality of display areas of the display.
11. The near-eye display device of claim 10, wherein the plurality of light-transmissive regions are disposed corresponding to the plurality of pixel units, and the plurality of light-reflective regions are disposed corresponding to the plurality of black matrices.
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| CN202110004082.7A CN112711139B (en) | 2021-01-04 | 2021-01-04 | Near-to-eye display device and optical system thereof |
| TW110100382A TWI749991B (en) | 2021-01-04 | 2021-01-06 | Near eye display device and optical system thereof |
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| TW202227874A (en) | 2022-07-16 |
| CN112711139A (en) | 2021-04-27 |
| TWI749991B (en) | 2021-12-11 |
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