CN212460200U - Near-to-eye display device - Google Patents
Near-to-eye display device Download PDFInfo
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- CN212460200U CN212460200U CN202021937280.6U CN202021937280U CN212460200U CN 212460200 U CN212460200 U CN 212460200U CN 202021937280 U CN202021937280 U CN 202021937280U CN 212460200 U CN212460200 U CN 212460200U
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Abstract
The present disclosure provides a near-eye display device comprising: the display screen is used for displaying images; the imaging lens is positioned on the light emitting side of the display screen and is used for imaging a display image of the display screen; the panel is positioned on one side of the imaging lens, which is far away from the display screen, and is obliquely arranged relative to the optical axis of the imaging lens; the phase delay layer is positioned on one side of the flat plate facing the imaging lens; the polarization beam splitting layer is positioned between the phase delay layer and the flat plate and is used for transmitting the first linearly polarized light and reflecting the second linearly polarized light with the polarization direction vertical to the first linearly polarized light; the polarizing layer is positioned between the polarization beam splitting layer and the flat plate and is used for transmitting the first linearly polarized light and absorbing the second linearly polarized light; and the curved mirror is positioned on the reflection light path of the polarization beam splitting layer, positioned on one side of the phase delay layer, which is far away from the flat plate, and used for reflecting the reflection light of the polarization beam splitting layer to the position of human eyes and transmitting the ambient light. The double-polarization-state light source can change the polarization state of light for multiple times, and double images are eliminated.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a near-to-eye display device.
Background
With the recent continuous development of Virtual Reality (VR) and Augmented Reality (AR) technologies, near-eye display products are being widely used in civil fields such as movie and television, education, and medical treatment from the beginning of military fields.
The near-eye display optical system has the characteristics of small volume, light weight, capability of realizing three-dimensional display and the like, and has a good development prospect, but the light can be refracted in the current near-eye display optical system in a mode of plating a semi-transparent and semi-reflective film on plate glass, and the light can be imaged through the imaging system after being reflected twice on the upper surface and the lower surface of the plate glass, so that the problem of double images can also occur when human eyes watch images, and the visual effect is influenced.
SUMMERY OF THE UTILITY MODEL
The disclosed embodiments provide a near-eye display device, comprising:
the display screen is used for displaying images;
the imaging lens is positioned on the light emitting side of the display screen and is used for imaging a display image of the display screen;
the flat plate is positioned on one side of the imaging lens, which is far away from the display screen, and is obliquely arranged relative to the optical axis of the imaging lens;
the phase delay layer is positioned on one side of the flat plate facing the imaging lens;
the polarization beam splitting layer is positioned between the phase delay layer and the flat plate and is used for transmitting first linearly polarized light and reflecting second linearly polarized light with the polarization direction being vertical to the first linearly polarized light;
the polarizing layer is positioned between the polarization beam splitting layer and the flat plate and is used for transmitting the first linearly polarized light and absorbing the second linearly polarized light; and
and the curved mirror is positioned on the reflection light path of the polarization beam splitting layer, positioned on one side of the phase delay layer, which is far away from the flat plate, and used for reflecting the reflection light of the polarization beam splitting layer to the position of human eyes and transmitting ambient light.
In some embodiments of the present disclosure, the transmission axis of the polarization splitting layer is parallel to the transmission axis of the polarization layer.
In some embodiments of the present disclosure, the polarization layer is attached to the surface of the flat plate, and the phase retardation layer, the polarization splitting layer, and the polarization layer are attached to each other.
In some embodiments of the present disclosure, an antireflection film is disposed on a surface of the flat plate on a side away from the polarizing layer.
In some embodiments of the present disclosure, the phase retardation layer is a quarter-wave plate; and the included angle between the optical axis of the quarter-wave plate and the transmission axis of the polarization beam splitting layer is 45 degrees.
In some embodiments of the present disclosure, an included angle between the flat plate and the optical axis of the imaging lens is 45 °.
In some embodiments of the present disclosure, the display screen is one of a liquid crystal display, an organic light emitting diode display, a micro organic light emitting diode display, or a light emitting diode display.
In some embodiments of the present disclosure, the imaging lens includes at least one lens; the lens is one of a spherical lens, an aspherical lens or a free-form surface lens.
In some embodiments of the present disclosure, the curved mirror is one of a spherical mirror, an aspherical mirror, or a free-form surface mirror.
In some embodiments of the present disclosure, a semi-transparent and semi-reflective film is disposed on a surface of one side of the curved mirror.
In some embodiments of the present disclosure, the transflective film has a reflectivity of 50% to 70%.
In some embodiments of the present disclosure, the near-eye display device is glasses or a helmet; the curved mirror is reused as a lens of the glasses or helmet.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without inventive labor.
FIG. 1 is a schematic diagram of an optical path of a near-eye display device in the related art;
FIG. 2 is a second schematic optical path diagram of a near-eye display device in the related art;
fig. 3 is a schematic structural diagram of a near-eye display device according to an embodiment of the present disclosure;
fig. 4 is one of schematic optical path diagrams of a near-eye display device provided in an embodiment of the present disclosure;
fig. 5 is a second schematic optical path diagram of a near-eye display device according to an embodiment of the disclosure;
fig. 6 is a second schematic structural diagram of a near-eye display device according to an embodiment of the disclosure.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, the present disclosure is further described in conjunction with the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words used in this disclosure to indicate position and orientation are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the disclosure. The drawings of the present disclosure are for illustrating relative positional relationships only and do not represent true scale.
A near-eye display device refers to a display apparatus worn on the eyes of a user, and for example, the near-eye display device is generally presented in the form of glasses or a helmet. Near-eye display devices may provide AR and VR experiences for users. In the AR near-eye display technology, a virtual image generated by a near-eye display device is displayed in a superimposed manner with a real image of the real world, so that a user can see a final enhanced real image from a screen. The VR near-eye display technology is to display images of the left and right eyes on near-eye displays corresponding to the left and right eyes, respectively, and the left and right eyes can synthesize stereoscopic vision in the brain after acquiring image information with differences, respectively.
The current near-to-eye display device comprises a coaxial fold-back optical system, a waveguide optical system and the like, wherein the coaxial fold-back optical system has a hollow structure compared with other optical systems, an optical framework is more compact, and the light and thin design can be realized; in addition, the image quality of the coaxial fold-back optical system is higher, and the field angle can be expanded to 50 ° or more compared with the waveguide optical system. The coaxial fold-back optical system has relatively simple requirements on optical design, thereby avoiding the use of a surface type with overlarge processing difficulty and reducing the production cost.
Fig. 1 is a schematic diagram of an optical path of a conventional near-eye display device.
Referring to fig. 1, in a current near-eye display device, light of an image source 100 is refracted in a manner that a half-transparent film is coated on a flat glass 200, and as can be seen from fig. 1, when light a0 emitted from the image source 100 enters the flat glass 200, a part of the light is reflected by an upper surface of the flat glass 200 to form reflected light a1, and the reflected light a1 enters a reflector 300 and is reflected again to form reflected light a11 for being viewed by human eyes. Meanwhile, when the light ray a0 emitted from the image source 100 is incident on the plate glass 200, a part of the light ray is transmitted to form a transmitted light ray a2, the transmitted light ray a2 is reflected by the lower surface of the plate glass 200 to form a reflected light ray a21, and the reflected light ray a21 is reflected again after being incident on the reflector 300 to form a reflected light ray a 211. Both the light ray a11 and the light ray a211 can be incident on the human eye, and then the human eye can see two images, which causes the problem of ghost image and affects the visual effect.
Fig. 2 is a second schematic optical path diagram of a conventional near-eye display device.
Referring to fig. 2, since the surface of the plate glass 200 is provided with the transflective film, in addition to the light emitted from the image source 100 being incident on the plate glass 200, the ambient light b0 may be incident on the plate glass 200 from the lower side of the near-eye display device. The ambient light b0 is reflected by the upper and lower surfaces of the flat glass 200 to form reflected light rays b1 and b 2. Therefore, when the human eyes watch the display image, the human eyes can also receive the ambient light from the lower part, and the effective image and the external scenery in front of the effective image are influenced to watch.
In view of the above, an embodiment of the present disclosure provides a near-eye display device, and fig. 3 is a schematic structural diagram of the near-eye display device according to the embodiment of the present disclosure. Referring to fig. 3, a near-eye display device provided by an embodiment of the present disclosure includes: the device comprises a display screen 1, an imaging lens 2, a flat plate 3, a phase delay layer 4, a polarization splitting layer 5, a polarization layer 6 and a curved mirror 7.
And the display screen 1 is used for displaying images.
The display screen 1 serves as an image source for displaying images. The near-to-eye display device can comprise two display screens 1 which are respectively used for displaying left and right eye images, and then the display images of the two display screens 1 are imaged by mutually independent imaging systems, so that the left and right eye images are observed by human eyes to generate certain parallax, and a stereoscopic display effect is generated.
The display screen 1 in a near-eye display device is generally smaller in size, and a higher resolution display screen may be used to display more image details, providing a more refined display image.
The display panel 1 may be one of a liquid crystal display, a light emitting diode display or an organic light emitting diode display, and is not limited herein.
A Liquid Crystal Display (LCD) is mainly composed of a backlight module and a Liquid Crystal Display panel. The liquid crystal display panel does not emit light, and brightness display needs to be realized by a light source provided by the backlight module. The LCD display principle is that liquid crystal is set between two pieces of conducting glass and driven by the electric field between two electrodes to produce the electric field effect of liquid crystal molecule distortion to control the transmission or shielding function of the back light source and display the image. If a color filter is added, a color image can be displayed. The liquid crystal display technology is mature, and the liquid crystal display screen has lower cost and excellent performance.
A Light Emitting Diode (LED) display is a display screen formed by an LED array, and the LEDs are used as display sub-pixels, and the display brightness of each LED is controlled to realize image display. The LED display has the characteristics of high brightness, low power consumption, low voltage requirement, small and exquisite equipment, convenience and the like. The LED display is adopted as the display screen 1 in the near-eye display device, which is beneficial to realizing the miniaturization of the near-eye display device.
Organic Light-Emitting Diode (OLED) display is also called Organic electroluminescent display or Organic Light-Emitting semiconductor display. The OLED display is a current-type organic light emitting device, and emits light by injection and recombination of carriers, and the intensity of light emission is proportional to the injected current. Under the action of an electric field, holes generated by an anode and electrons generated by a cathode move, are respectively injected into a hole transport layer and an electron transport layer, and migrate to a light emitting layer. When the two meet at the light emitting layer, energy excitons are generated, thereby exciting the light emitting molecules to finally generate visible light. The OLED display is a self-luminous display screen, so that a backlight module is not required to be arranged, the whole thickness of the device is small, the miniaturization of the near-to-eye display device is facilitated, and the installation of the whole device is facilitated.
The micro organic light emitting diode display is to miniaturize the light emitting unit of the organic light emitting diode, so that more pixels can be arranged in a limited size, and the resolution of the display screen is improved.
And the imaging lens 2 is positioned on the light emergent side of the display screen 1 and is used for imaging the display image of the display screen 1.
The size of a display screen 1 in the near-to-eye display device is small, and a display image cannot be directly watched by human eyes, so that an imaging lens 2 needs to be arranged on the light emitting side of the display screen 1, and the display image is magnified and imaged and then is observed and imaged by the human eyes.
In the embodiment of the present disclosure, the imaging lens 2 includes at least one lens, and taking the near-eye display device shown in fig. 2 as an example, the imaging lens 2 in the embodiment of the present disclosure includes a first lens 21 and a second lens 22. The first lens 21 is located on the light-emitting side of the display screen 1, the second lens 22 is located on the side of the first lens 21 away from the display screen 1, the first lens 21 may be a positive lens, and the second lens 22 may be a negative lens.
In specific implementation, the imaging lens 2 may also adopt a lens to simplify the structure; alternatively, the imaging lens 2 may also adopt more than three lenses, so as to optimize the imaging quality, and the embodiment of the present disclosure is only illustrated by the imaging lens 2 including two lenses, and the number of lenses in the imaging lens 2 is not specifically limited. The type of the lens in the imaging lens 2 needs to be designed according to actual conditions, and is not limited herein.
The lens in the imaging lens 2 may employ a spherical lens, an aspherical lens, or a free-form lens. The spherical lens has the advantages of simple design, low requirement on assembly precision and the like. The thicknesses of the aspheric lens and the free-form surface lens are relatively small, so that the image quality can be optimized, and the aspheric lens and the free-form surface lens can be selected according to actual requirements during optical design.
The material of the lens in the imaging lens 2 may be one of glass and plastic, and is not limited herein.
And the flat plate 3 is positioned on one side of the imaging lens 2, which is far away from the display screen 1, and is obliquely arranged relative to the optical axis of the imaging lens 2.
The plate 3, which serves as a support member in the near-eye display device, may be used to dispose other functional film layers on the surface thereof, thereby maintaining a set angular relationship between the functional film layers and the imaging lens 2.
The material of the flat plate 3 may be a hard transparent material such as glass or plastic. The two surfaces of the plate 3 are parallel to each other. The included angle between the plane of the flat plate 3 and the optical axis of the imaging lens 2 can be 45 degrees, so that the imaging light emitted by the imaging lens can be ensured to enter the functional film layer on the surface of the flat plate 3 at 45 degrees.
In the disclosed embodiment, the functional film layer on the flat plate 3 includes: a phase retardation layer 4, a polarization splitting layer 5, and a polarizing layer 6. Wherein, the phase delay layer 4 is positioned on one side of the flat plate 3 facing the imaging lens 2; the polarization beam splitting layer 5 is positioned between the phase delay layer 4 and the flat plate 3; the polarizing layer 6 is located between the polarization splitting layer 5 and the plate 3.
The phase retardation layer 4 has a phase retardation effect, and in the embodiment of the present disclosure, the polarization state of light may be converted by using the phase retardation effect of the phase retardation layer 4.
The polarization splitting layer 5 is used for transmitting the first linearly polarized light and reflecting the second linearly polarized light, and the polarization directions of the first linearly polarized light and the second linearly polarized light are mutually vertical. In the embodiment of the present disclosure, the polarization splitting layer 5 may be configured to transmit linearly polarized light (p light) with a vibration direction parallel to the light incident surface and reflect linearly polarized light (s light) with a vibration direction perpendicular to the light incident surface.
The polarizing layer 6 employs an absorptive polarizer, and linearly polarized light having a polarization direction parallel to the transmission axis of the polarizing layer 6 can be transmitted, and linearly polarized light having a polarization direction perpendicular to the transmission axis of the polarizing layer 6 is absorbed. The transmission axis of the polarizing layer 6 is parallel to the transmission axis of the polarization splitting layer 5. If the polarization splitting layer 5 is used to transmit p-light and reflect s-light, the polarization layer 6 has a role of absorbing s-light.
In the embodiment of the present disclosure, the phase retardation layer 4 may adopt a quarter-wave plate, and an included angle between an optical axis of the quarter-wave plate and a transmission axis of the polarization splitting layer 5 is set to be 45 °, so that linearly polarized light after being split by the polarization splitting layer 5 can be converted into circularly polarized light when passing through the quarter-wave plate.
And the curved mirror 7 is positioned on the reflection light path of the polarization splitting layer 5 and on one side of the phase delay layer 4, which is far away from the flat plate 3, and is used for reflecting the reflection light of the polarization splitting layer 5 to the position of human eyes and transmitting ambient light.
The curved mirror 7 and the imaging lens 2 constitute an optical system for imaging the display screen 1. The curved mirror 7 may be one of a spherical mirror, an aspherical mirror, and a free-form curved mirror. The spherical lens has the advantages of simple design, low requirement on assembly precision and the like. The thicknesses of the aspheric lens and the free-form surface lens are relatively small, so that the image quality can be optimized, and the aspheric lens and the free-form surface lens can be selected according to actual requirements during optical design. The material of the curved mirror 7 may be one of glass and plastic, and is not limited herein.
The near-eye display device provided by the embodiment of the disclosure can be glasses or a helmet, and at this time, the curved mirror 7 can be reused as a lens of the glasses or the helmet, so that the number of lenses used by the near-eye display device is reduced.
As shown in fig. 3, the imaging process of the near-eye display device provided by the embodiment of the present disclosure is that the display screen 1 displays an image, and the emergent light ray a0 enters the phase retardation layer 4 after passing through the imaging lens 2; the light enters the polarization beam splitting layer 5 after passing through the phase delay layer 4; the polarization splitting layer 5 can transmit the first linearly polarized light and can reflect the second linearly polarized light with the polarization direction perpendicular to the first linearly polarized light. Then, after the light ray a0 is incident on the polarization splitting layer 5, the polarization splitting layer 5 reflects the second linearly polarized light component of the light ray a0 to the side of the curved mirror 7 to form a reflected light ray a 1; the curved mirror 7 further reflects the light ray a1 to form a reflected light ray a 11; the reflected light ray a11 can pass through the phase retardation layer 4, the polarization splitting layer 5, the polarization layer 6 and the plate 3 to exit to the position of human eyes. The human eye can view the image displayed on the display screen 1 when receiving the light ray a 11.
Meanwhile, the ambient light c0 enters the near-eye display device from the side of the curved mirror 7, the ambient light c0 enters the human eye through the curved mirror 7, the phase retardation layer 4, the polarization splitting layer 5, the polarizing layer 6 and the flat plate 3, and the human eye can view an ambient scene in front when receiving the ambient light c 0.
The following provides a detailed description of the principle of the light applied by the near-eye display device provided in the embodiments of the present disclosure.
Fig. 4 is one of schematic optical path diagrams of a near-eye display device provided in an embodiment of the present disclosure.
Referring to fig. 4, the display panel 1 may adopt one of a liquid crystal display, an organic light emitting diode display and a light emitting diode display, and thus the light emitted from the display panel 1 is natural light or linearly polarized light. When the light emitted from the display screen 1 is natural light, the emitted light a0 is incident to the phase retardation layer 4 after being imaged by the imaging lens 2, and is still natural light after passing through the phase retardation layer 4; when the light emitted from the display panel 1 is linearly polarized light, the emitted light a0 enters the phase retardation layer 4 after being imaged by the imaging lens 2, and is converted into circularly polarized light after passing through the phase retardation layer. When the light enters the polarization splitting layer 5, the polarization splitting layer 5 transmits a component of the first linearly polarized light (p light, x in fig. 4 represents p light) whose vibration direction is parallel to the incident surface, and reflects a component of the second linearly polarized light (s light,/"in fig. 4 represents s light) whose vibration direction is perpendicular to the incident surface, whereby the light a0 forms the reflected light a1 emitted to the curved mirror 7 side and the transmitted light a2 emitted to the flat plate 3 side after entering the polarization splitting layer 5.
The reflected light ray a1 (the second linearly polarized light, i.e., s light) is incident to the phase retardation layer 4 again, and is converted into circularly polarized light after passing through the phase retardation layer 4 (for example, the s light is converted into right-handed circularly polarized light after passing through the phase retardation layer); the circularly polarized light is reflected by the curved mirror 7 after entering the curved mirror 7 to form reflected light ray a11, and the reflected light ray a11 is still circularly polarized light with a rotation direction opposite to that of the incident light ray a1 (for example, from right-handed circularly polarized light to left-handed circularly polarized light). The light ray a11 is incident on the phase retardation layer 4 again, and is converted into linearly polarized light after passing through the phase retardation layer 4, and the polarization direction is opposite to that of the incident light ray a1 (for example, the left-handed circularly polarized light is converted into p light, i.e., the first linearly polarized light, after passing through the phase retardation layer). The light ray a11 passing through the phase retardation layer 4 is the first linearly polarized light and can be transmitted by the polarization splitting layer 5, while the polarization layer 6 can absorb the second linearly polarized light and transmit the first linearly polarized light, so the light ray a11 can be transmitted by the polarization layer 6 and finally transmitted through the flat plate 3 to be incident on the position of the human eye.
The transmitted light ray a2 (first linearly polarized light, i.e. p light) is incident to the polarizing layer 6, the polarizing layer 6 can absorb the second linearly polarized light and transmit the first linearly polarized light, so the light ray a2 can be transmitted by the polarizing layer 6; after the transmitted light ray a2 is incident on the flat plate 3, part of the light ray is reflected by the surface of the flat plate 3 to form a reflected light ray a21, and the reflected light ray a21 is still the first linearly polarized light (p light), so that the light ray 21 can be transmitted by the polarizing layer 6 when being incident on the polarizing layer 6 again; the light ray a21 transmitted by the polarizing layer 6 remains as the first line, and when the light ray is incident on the polarization splitting layer 5 again, the polarization splitting layer 5 can transmit the first linearly polarized light and reflect the second linearly polarized light, so the light ray a21 can be transmitted by the polarization splitting layer 5; the light ray a21 transmitted by the polarization splitting layer 5 is incident to the phase retardation layer 4 again, and is converted into circularly polarized light after passing through the phase retardation layer 4 (for example, the p light is converted into left-handed circularly polarized light after passing through the phase retardation layer); the circularly polarized light is reflected by the curved mirror 7 after entering the curved mirror 7 to form reflected light ray a22, and the reflected light ray a22 is still circularly polarized light with a rotation direction opposite to that of the incident light ray a21 (for example, from left-handed circularly polarized light to right-handed circularly polarized light). The light ray a22 is incident on the phase retardation layer 4 again, and is converted into linearly polarized light after passing through the phase retardation layer 4, and the polarization direction is opposite to that of the incident light ray a21 (for example, the right-handed circularly polarized light is converted into s light after passing through the phase retardation layer, i.e., the second linearly polarized light). The light ray a22 passing through the phase retardation layer 4 is the second linearly polarized light, and thus when entering the polarization splitting layer 5 again, it is reflected by the polarization splitting layer 5 to form a reflected light ray a23 emitted toward the imaging lens 2. The reflected light 23 is a second linearly polarized light, and is converted into a circularly polarized light after being incident on the retardation layer 4 again (for example, s light is converted into a right-handed circularly polarized light after passing through the retardation layer); because of natural reflection on the surface of the imaging lens 2, a small portion of the light ray a23 is still reflected by the imaging lens 2 to form a reflected light ray a24, and the reflected light ray a24 is still circularly polarized light, which rotates in the opposite direction to the rotation direction of the light ray a23 (for example, from right-handed circularly polarized light to left-handed circularly polarized light). The light ray a24 again enters the phase retardation layer 4, is converted into linearly polarized light by the phase retardation layer 4, and has a polarization direction opposite to that of the incident light ray a23 (for example, the left-handed circularly polarized light is converted into p light after passing through the phase retardation layer, i.e., the first linearly polarized light). The light ray a24 passing through the phase retardation layer 4 is the first linearly polarized light, and thus can be transmitted by the polarization splitting layer 5 after entering the polarization splitting layer 5, and the transmitted light a24 can be transmitted by the polarization layer 6 after entering the polarization layer 6, and finally exits downwards through the flat plate 3.
As can be seen from this, the partial light ray a1 reflected by the polarization splitting layer 5 in the imaging light ray a0 is finally emitted to the position of the human eye for image display after being reflected by the curved mirror 7. In the imaging light ray a0, the partial light ray a2 transmitted by the polarization splitting layer 5 finally exits downward after acting on each component of the near-eye display device and does not exit in the direction of the human eyes, so that the partial light ray does not interfere with normal image display and ghost images are prevented from being formed.
It is to be noted that the light splitting effect of the polarization splitting layer 5 does not reach a complete light splitting, and therefore, the image light a0 has a part of the second linearly polarized light transmitted after being incident on the polarization splitting layer 5. The polarizing layer 6 below the polarization splitting layer 5 has the function of absorbing the second linearly polarized light, so that the transmitted small part of the second linearly polarized light is absorbed by the polarizing layer 6 when reaching the polarizing layer 6, and the transmitted small part of the second linearly polarized light cannot reach the flat plate 3 and cannot be returned to the near-to-eye display device, thereby avoiding the interference of the light to the image display and avoiding the generation of ghost images.
Fig. 5 is a second schematic optical path diagram of a near-eye display device according to an embodiment of the disclosure. Fig. 5 shows the path of ambient light incident on a near-eye display device.
Referring to fig. 5, ambient light may enter the near-eye display device from the side of the curved mirror 7, as shown in fig. 5, the ambient light c0 is natural light, the ambient light c0 may enter the polarization splitting layer 5 through the transmission of the curved mirror 7 and the phase retardation layer 4, the polarization splitting layer 5 transmits the first linearly polarized light component of the ambient light c0, the transmitted light c0 enters the polarizing layer 6, the transmission axis of the polarizing layer 6 is parallel to the transmission axis of the polarization splitting layer 5, so the light transmitted by the polarization splitting layer 5 may also be transmitted by the polarizing layer 6, and finally the light c0 passes through the flat plate 3 and exits to the position of the human eye.
In addition, a part of the ambient light may be incident into the near-eye display device from the side of the plate 3, and as shown in fig. 5, the ambient light b0 is natural light, and when incident on the surface of the plate 3, a part of the light is transmitted by the plate 3 to form a transmitted light b1, and a part of the light is reflected by the plate 3 to form a reflected light b 2. The ambient light b0 incident on the near-eye display device from the panel 3 side is stray light, and when the transmitted light b1 of the ambient light c0 after being transmitted by the panel 3 is incident on the polarizing layer 6, only the component having the polarization direction parallel to the transmission axis of the polarizing layer 6 is transmitted, and the other light is absorbed. The brightness of the transmitted light is much lower than that of the light for image display in the near-to-eye display device, so that the light effect of secondary reflection after entering the light path is negligible. Since the light b2 reflected by the plate 3 has a low reflectance, the brightness of the image light can be ignored, and thus the light incident on the near-eye display device from the side of the plate 3 does not interfere with the image light, and the stray light directly below the display device is not visible.
Therefore, by adopting the structure of the near-eye display device provided by the embodiment of the disclosure, the generation of ghost images can be effectively inhibited, meanwhile, the interference of stray light on imaging can be eliminated, and the viewing experience is optimized.
Fig. 6 is a second schematic structural diagram of a near-eye display device according to an embodiment of the disclosure.
The polarisation layer 6 and the polarization beam splitting layer 5 in the embodiment of this disclosure adopt soft membrane material usually, need to set up the substrate and support, and dull and transparent materials such as glass or plastics can be adopted to dull and stereotyped 3's material, as shown in fig. 6, can laminate polarisation layer 6 in dull and stereotyped 3's surface, laminate polarisation beam splitting layer 5 in polarisation layer 6's surface again, laminate phase delay layer 4 in polarisation beam splitting layer 5's surface, thereby make phase delay layer 4, polarisation beam splitting layer 5 and polarisation layer 6 laminate each other, laminate on dull and stereotyped 3 jointly, support by the flat board, save the required substrate of each rete, be favorable to the frivolous design of device, also can reduce near-to-eye display device's equipment complexity.
In order to avoid the above problem, as shown in fig. 6, an antireflection film 8 is disposed on the surface of the flat plate 3 facing away from the polarizing layer 6, so as to increase the transmission of the imaging light, suppress the reflection of ambient light and stray light, and optimize the imaging effect of the near-eye display device.
The curved mirror 7 is used not only for reflecting the imaging light passing through the imaging lens 2 and the like but also for transmitting the ambient light, and therefore a half-transmissive and half-reflective film may be provided on at least one of the surface of the curved mirror 7 on the side facing the polarization splitting sheet 5 and the surface on the side facing away from the polarization splitting sheet 5. In order to ensure the contrast of the displayed image in the atmosphere of strong ambient light, the reflectivity of the transflective film can be 50-70%.
The near-eye display device provided by the embodiment of the disclosure comprises: the display screen is used for displaying images; the imaging lens is positioned on the light emitting side of the display screen and is used for imaging a display image of the display screen; the panel is positioned on one side of the imaging lens, which is far away from the display screen, and is obliquely arranged relative to the optical axis of the imaging lens; the phase delay layer is positioned on one side of the flat plate facing the imaging lens; the polarization beam splitting layer is positioned between the phase delay layer and the flat plate and is used for transmitting the first linearly polarized light and reflecting the second linearly polarized light with the polarization direction vertical to the first linearly polarized light; the polarizing layer is positioned between the polarization beam splitting layer and the flat plate and is used for transmitting the first linearly polarized light and absorbing the second linearly polarized light; and the curved mirror is positioned on the reflection light path of the polarization beam splitting layer, positioned on one side of the phase delay layer, which is far away from the flat plate, and used for reflecting the reflection light of the polarization beam splitting layer to the position of human eyes and transmitting the ambient light.
In the near-eye display device provided by the embodiment of the disclosure, the phase delay layer, the polarization splitting layer, the polarization layer and other elements are adopted to perform multiple conversions on the polarization state of incident light, so that the double image is suppressed. The phase delay layer, the polarization splitting layer and the polarizing layer are arranged on one side of the flat plate facing the curved mirror, so that stray light generated by insufficient splitting of the polarization splitting layer can be absorbed by the polarizing layer before entering the flat plate for reflection, and ghost images are avoided. The near-eye display device structure provided by the embodiment of the disclosure can also prevent the influence of the position where the ambient stray light enters the human eyes on the image to be viewed.
While preferred embodiments of the present disclosure have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the disclosure.
It will be apparent to those skilled in the art that various changes and modifications can be made in the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations as well.
Claims (12)
1. A near-eye display device, comprising:
the display screen is used for displaying images;
the imaging lens is positioned on the light emitting side of the display screen and is used for imaging a display image of the display screen;
the flat plate is positioned on one side of the imaging lens, which is far away from the display screen, and is obliquely arranged relative to the optical axis of the imaging lens;
the phase delay layer is positioned on one side of the flat plate facing the imaging lens;
the polarization beam splitting layer is positioned between the phase delay layer and the flat plate and is used for transmitting first linearly polarized light and reflecting second linearly polarized light with the polarization direction being vertical to the first linearly polarized light;
the polarizing layer is positioned between the polarization beam splitting layer and the flat plate and is used for transmitting the first linearly polarized light and absorbing the second linearly polarized light; and
and the curved mirror is positioned on the reflection light path of the polarization beam splitting layer, positioned on one side of the phase delay layer, which is far away from the flat plate, and used for reflecting the reflection light of the polarization beam splitting layer to the position of human eyes and transmitting ambient light.
2. The near-eye display device of claim 1, wherein a transmission axis of the polarization splitting layer is parallel to a transmission axis of the polarizing layer.
3. The near-eye display device of claim 1, wherein the polarizing layer is attached to a surface of the plate, and the phase retardation layer, the polarization splitting layer, and the polarizing layer are attached to each other.
4. The near-to-eye display device of claim 3, wherein a surface of the flat panel on a side facing away from the polarizing layer is provided with an antireflection film.
5. The near-eye display device of claim 1, wherein the phase retardation layer is a quarter-wave plate; and the included angle between the optical axis of the quarter-wave plate and the transmission axis of the polarization beam splitting layer is 45 degrees.
6. The display device of claim 1, wherein an angle between the flat panel and an optical axis of the imaging lens is 45 °.
7. The display device of any one of claims 1-6, wherein the display screen is one of a liquid crystal display, an organic light emitting diode display, a micro organic light emitting diode display, or a light emitting diode display.
8. The display device of any one of claims 1-6, wherein the imaging lens comprises at least one lens; the lens is one of a spherical lens, an aspherical lens or a free-form surface lens.
9. The display device of any one of claims 1-6, wherein the curved mirror is one of a spherical mirror, an aspherical mirror, or a free-form surface mirror.
10. The display device of claim 9, wherein a semi-transparent and semi-reflective film is disposed on one side surface of the curved mirror.
11. The display device of claim 10, wherein the transflective film has a reflectivity of 50% to 70%.
12. The display device of any one of claims 1-6, wherein the near-eye display device is glasses or a helmet; the curved mirror is reused as a lens of the glasses or helmet.
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| CN202021937280.6U CN212460200U (en) | 2020-09-07 | 2020-09-07 | Near-to-eye display device |
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| CN202021937280.6U CN212460200U (en) | 2020-09-07 | 2020-09-07 | Near-to-eye display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965820A (en) * | 2020-08-07 | 2020-11-20 | 联想(北京)有限公司 | Optical structure and wearable equipment |
| WO2022048384A1 (en) * | 2020-09-07 | 2022-03-10 | 京东方科技集团股份有限公司 | Near-eye display device |
-
2020
- 2020-09-07 CN CN202021937280.6U patent/CN212460200U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965820A (en) * | 2020-08-07 | 2020-11-20 | 联想(北京)有限公司 | Optical structure and wearable equipment |
| WO2022048384A1 (en) * | 2020-09-07 | 2022-03-10 | 京东方科技集团股份有限公司 | Near-eye display device |
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