CN111258062B - Display unit, near-to-eye display optical module and near-to-eye display system - Google Patents
Display unit, near-to-eye display optical module and near-to-eye display system Download PDFInfo
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- CN111258062B CN111258062B CN201811464262.8A CN201811464262A CN111258062B CN 111258062 B CN111258062 B CN 111258062B CN 201811464262 A CN201811464262 A CN 201811464262A CN 111258062 B CN111258062 B CN 111258062B
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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
Abstract
The invention provides a display unit, a near-eye display optical module and a near-eye display system, wherein the display unit comprises a linear polarization layer, an optical characteristic changing layer and a functional layer which are sequentially stacked; the functional layer is internally provided with a curved surface, the curved surface forms a refraction surface, the refraction surface is provided with a light-emitting element of which the light-emitting direction faces the light characteristic changing layer, the light of external environment light sequentially passes through the linear polarization layer, the light characteristic changing layer and the functional layer, the light emitted by the light-emitting element passes through the light characteristic changing layer and the functional layer and is refracted at the refraction surface, and the light of the light-emitting element passing through the light characteristic changing layer and the functional layer is parallel to the light of the external environment light. The invention can ensure that the near-to-eye display image and the external transmission image in the human eyes have higher display brightness and definition, and improves the imaging quality of the near-to-eye display system.
Description
Technical Field
The invention relates to the technical field of augmented reality, in particular to a display unit, a near-eye display optical module and a near-eye display system.
Background
Augmented Reality (AR) is a technology for Augmented Reality of a real scene using virtual objects and information, so that the virtual objects and the real environment can be superimposed on the same picture or space. The method is widely applied to various fields such as scientific research, military, industry, games, videos, education and the like.
The current near-eye display system generally comprises a transparent or semitransparent display screen, a negative lens and a positive lens, wherein an image of the near-eye display system comprises a near-eye display image and an external transmission image which are formed by different imaging light paths in the near-eye display system. The near-eye display image is formed by projecting an image to the retina of the human eye through the positive lens by the display screen, and the external transmission image is formed by transmitting ambient light to the retina of the human eye through the negative lens, the display screen and the positive lens. The near-eye display image and the external transmission image are superposed in the retina of the human eye, so that the user can see the virtual picture of the display screen and the external real environment at the same time.
However, the current near-eye display system has the problems that the display brightness of one of the near-eye display image and the external transmission image is low, and the display image is not clear.
Disclosure of Invention
In order to solve at least one problem mentioned in the background art, the invention provides a display unit, a near-eye display optical module and a near-eye display system, which can adjust the virtual image distance of a light-emitting element entering human eyes, and simultaneously do not affect external ambient light, thereby ensuring that both near-eye display images and external transmission images in the human eyes have higher definition, and improving the imaging quality of the near-eye display system.
In order to achieve the above object, in a first aspect, the present invention provides a display unit comprising a linear polarization layer, an optical property changing layer, and a functional layer, which are sequentially stacked;
a curved surface is arranged in the functional layer, and the curved surface forms a refraction surface;
be provided with light emitting component on the refraction face, light emitting component's light-emitting direction changes the layer towards light characteristic, and the light of outside environment light passes through linear polarization layer, light characteristic change layer and functional layer in proper order, and the light that light emitting component sent changes layer and functional layer through light characteristic to take place the refraction in refraction face department, the light of light emitting component through light characteristic change layer and functional layer is parallel with the light of outside environment light.
The display unit provided by the invention is provided with a linear polarization layer, an optical characteristic changing layer and a functional layer in a laminated mode. When light of the light emitting element passes through the light characteristic changing layer, the light characteristic is changed, and the light of the characteristic is refracted at the refracting surface in the functional layer, thereby changing the angle and brightness of the light entering human eyes. After the light of the external environment passes through the linear polarization layer, the light characteristics are also changed, and the light with the characteristics can not be refracted at the refraction surface, so that the ambient light entering human eyes can not be changed. Through foretell light adjustment process, can adjust the virtual image distance of light emitting component in people's eye, make it be in people's eye's photopic vision distance scope, do not produce any influence to external environment light simultaneously to guarantee that the nearly eye in people's eye shows that image and external transmission image all have higher definition.
In the above display unit, optionally, the functional layer includes an anisotropic material layer and a refractive index matching layer; the anisotropic material layer is stacked between the refractive index matching layer and the optical property changing layer; alternatively, the refractive index matching layer is stacked between the anisotropic material layer and the optical property changing layer.
The value of the refractive index of the base refractive index matching layer is the same as the conventional refractive index of the anisotropic material layer and is smaller than the conventional refractive index of the anisotropic material layer. Therefore, for incident light with a polarization direction perpendicular to the optical axis of the anisotropic material layer, it will not be refracted when passing through the arc-shaped interface between the liquid crystal layer and the index matching layer. And for incident light with a polarization direction parallel to the optical axis of the anisotropic material layer, it will be refracted when passing through the arc-shaped interface between the liquid crystal layer and the index matching layer.
In the above display unit, optionally, an interface between the anisotropic material layer and the index matching layer is a curved surface, and a bending direction of the curved surface faces the index matching layer.
In the above display unit, the light characteristic changing layer may optionally include a wire grid polarizing layer for changing a traveling direction of the light emitted from the light emitting element and adjusting a polarization state of the light.
The direction of the light reflection axis of the wire grid polarizing layer, the direction of the optical axis of the anisotropic material layer, and the direction of the light absorption axis of the linear polarizing layer are parallel to each other.
By arranging the light characteristic changing layer as a wire grid polarizing layer, the wire grid polarizing layer is utilized to reflect light in a linear polarization state so that the light is refracted when passing through the refracting surface, thereby adjusting the angle of the light entering human eyes.
In the above display unit, the light characteristic changing layer may optionally include a quantum rod layer for changing a color and a propagation direction of light emitted from the light emitting element and adjusting a polarization state of the light.
The direction of the light absorption axis of the quantum rod layer, the direction of the optical axis of the anisotropic material layer and the direction of the light absorption axis of the linear polarization layer are parallel to each other.
The light characteristic changing layer is set to be the quantum rod layer, the color and the propagation direction of light are changed by the quantum rod layer, and the polarization state of the light is adjusted, so that the light is refracted when passing through the refraction surface, and the color and the angle of the light entering human eyes are adjusted.
In the above display unit, optionally, the light emitted by the light emitting element is blue light, and the quantum rod layer is a red quantum rod layer or a green quantum rod layer.
By setting the light of the light emitting unit to be blue light, and the light intensity is high because the wavelength of the blue light is short, it can be ensured that the light of the light emitting element has sufficient energy to perform a change process of the optical characteristics when passing through the optical characteristic changing layer.
In the above display unit, optionally, the refractive surface is a light-transmitting arc surface, and a focal point of the refractive surface is located on the light property changing layer.
The focus of the refraction surface is arranged on the optical characteristic changing layer, the distance from the optical characteristic changing layer to human eyes can be changed by adjusting the optical characteristic, so that the angle of light entering the human eyes is adjusted, the imaging of the light-emitting element is ensured to be within the range of the photopic vision distance of the human eyes, and an image with higher definition can be formed in the human eyes.
In the above display unit, optionally, the light emitting element is disposed at a center position of the arc surface.
Through setting up light emitting component in the central point of cambered surface puts, can guarantee light emitting component's light evenly distributed on the light characteristic changes the layer to guarantee that the characteristic of this light takes place the uniform change, and guarantee the homogeneity of the light luminance that gets into people's eyes.
In a second aspect, the present invention provides a near-eye display optical module, including the above display unit, where the plurality of display units include at least one first display unit provided with a wire grid polarization layer, at least one second display unit provided with a red quantum rod layer, and at least one third display unit provided with a green quantum rod layer.
The first display unit, the second display unit and the third display unit are tiled in an array arrangement mode, wherein light emitted by the light emitting elements of the first display unit, the second display unit and the third display unit is blue light.
The near-eye display optical module provided by the invention has the advantages that at least one first display unit provided with the wire grid polarizing layer, at least one second display unit provided with the red quantum rod layer and at least one third display unit provided with the green quantum rod layer are tiled in an array arrangement mode, so that a preset color image can be formed in human eyes, the virtual image distance of the light-emitting elements of the display units entering the human eyes can be adjusted by using the display units, and meanwhile, no influence is generated on external environment light, so that the near-eye display image and the external transmission image in the human eyes have higher display definition, and the imaging quality of a near-eye display system is improved.
In a third aspect, the present invention provides a near-eye display system, including the above-mentioned near-eye display optical module.
According to the near-eye display system provided by the invention, by arranging the near-eye display optical module, the distance of a virtual image of a light emitting element entering human eyes can be adjusted through the display unit, and meanwhile, no influence is generated on external environment light, so that the near-eye display image in the human eyes and an external transmission image have high definition, and the imaging quality of the near-eye display system is improved.
The construction of the present invention and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display unit provided with a quantum rod layer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a display unit with a wire grid polarizer layer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display unit provided with a quantum rod layer according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a near-eye display optical module according to a third embodiment of the present invention.
Description of reference numerals:
100-a display unit;
10-a linear polarizing layer;
20-an optical property changing layer;
21-a quantum rod layer;
22-wire grid polarizer layer;
30-an index matching layer;
40-a layer of anisotropic material;
41-a refracting surface;
50-a light emitting element;
l1 — light of light emitting element;
l2 — ambient light;
200-a near-eye display optical module;
201 — a first display unit;
202-a second display unit;
203 — third display unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example one
Fig. 1 is a schematic structural diagram of a display unit provided with a quantum rod layer according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a display unit provided with a wire grid polarization layer according to an embodiment of the present invention.
The inventor of the present invention finds in the actual research process that, in the current near-eye display system, in order to ensure the definition of an image in human eyes, it is generally necessary to adjust the optical path of light entering human eyes from the image. However, since the image of the near-eye display system includes the near-eye display image of the virtual frame and the external transmission image including the real frame, in the current light path adjustment process, the imaging light path of the near-eye display image and the imaging light path of the external transmission image are simultaneously changed, but the imaging distances are not uniform due to the difference between the two imaging light paths. The simultaneous change of the imaging optical path can cause one of the two images to still have the problem of the displayed image being unclear.
Based on the above findings and the existing technical problems, the embodiments of the present invention provide the following solutions:
referring to fig. 1, an embodiment of the present invention provides a display unit 100 including a linear polarization layer 10, an optical characteristic changing layer 20, and a functional layer, which are sequentially stacked.
A curved surface is provided in the functional layer, which constitutes the refractive surface 41, and which may be curved in a direction towards or away from the linear polarization layer 10, and in this embodiment, as shown in fig. 1, which is curved in a direction away from the linear polarization layer 10. The curved direction of the curved surface refers to the direction of the convex side of the curved surface.
The refractive surface 41 is provided with a light emitting element 50, and the light emitting direction of the light emitting element 50 is directed toward the optical property changing layer 20.
The light ray L2 of the external environment light passes through the linear polarization layer 10, the optical characteristic changing layer 20, and the functional layer in this order, but is not refracted at the refractive surface 41. The light L1 emitted from the light emitting element 50 passes through the optical property changing layer 20 and the functional layer in this order, and is refracted at the refractive surface 41, and the light passing through the refracted light emitting element and the light of the external environment light are parallel to each other.
Wherein the functional layers include an anisotropic material layer 40 and an index matching layer 30, and the anisotropic material layer 40 is laminated between the index matching layer 30 and the optical property changing layer 20. The connection interface of the anisotropic material layer 40 and the refractive index matching layer 30 is a curved surface, and the curved surface is curved toward the refractive index matching layer 30.
Note that, referring to fig. 1, the interface between the anisotropic material layer 40 and the refractive index matching layer 30 may include an outer wall surface of the anisotropic material layer 40 on the side facing the refractive index matching layer 30, and an outer wall surface of the refractive index matching layer 30 on the side facing the anisotropic material layer 40. When the interface is bent to form a refraction surface, the outer wall surfaces of the two parts are synchronously bent to ensure the close fit state of the two parts.
It should be noted that the display unit 100 provided in this embodiment may be applied to a near-eye display system. The linear polarization layer 10, the optical characteristic changing layer 20, the anisotropic material layer 40, and the refractive index matching layer 30 stacked in the display unit 100 may be disposed along a direction in which a light ray L2 of an external environment enters a human eye, that is, the refractive index matching layer 30 is disposed near a side of the human eye, the linear polarization layer 10 is disposed near a side of the external environment, and the optical characteristic changing layer 20 and the anisotropic material layer 40 are disposed therebetween.
The linear polarizer 10 may be an absorption type linear polarizer or a reflection type linear polarizer, and in practical use, it may be selected according to needs, which is not limited in this embodiment. The linear polarization layer 10 has a light transmission axis and a light reflection axis (light absorption axis) perpendicular to each other, and when a beam of normal light passes through the linear polarization layer 10, assuming that the normal light includes a horizontally polarized light vibrating in a horizontal direction and a vertically polarized light vibrating in a vertical direction, a portion of the beam parallel to the light transmission axis may be transmitted through the linear polarization layer 10, and a portion of the beam parallel to the light reflection axis (light absorption axis) in a polarization direction may be reflected (absorbed) by the linear polarization layer 10.
The anisotropic material layer 40 has different physical or mechanical properties (such as absorbance, refractive index, electrical conductivity, tensile strength, etc.) in different axial directions, and the anisotropic material layer 40 may be made of an anisotropic liquid crystal or quartz material, which is not limited in this embodiment. The physical or mechanical properties of the index matching layer 30 are the same in the direction of its different axes. Wherein the general refractive index of the anisotropic material layer 40 is the same as the refractive index of the index matching layer 30. The non-conventional refractive index of the anisotropic material layer 40 is greater than the refractive index of the index matching layer 30.
When the polarization direction of the polarized light passes through the anisotropic material layer 40 and is parallel to the optical axis direction of the anisotropic material layer, the interface 41 between the anisotropic material layer 40 and the refractive index matching layer 30 can generate refraction effect on the polarized light; and when the polarization direction of light is perpendicular to the optical axis direction of the anisotropic material layer, the interface 41 between the anisotropic material layer 40 and the refractive index matching layer 30 does not have a refraction effect on the light of the polarization state.
Further, a light emitting element 50 is disposed on the anisotropic material layer 40, and the light emitting element 50 may be an electroluminescent element, such as an organic light emitting diode device. The light emitting direction of the light emitting element 50 is toward the optical property changing layer 20, so that the light path through which the light L1 of the light emitting element 50 passes may first pass through the anisotropic material layer 40, then pass through the optical property changing layer 20, the propagation direction is turned back, and the light passes through the anisotropic material layer 40 again and then enters the human eye through the refractive index matching layer 30. The light path of the light L2 of the external environment is different from the light path of the light L1 of the light emitting element 50 by first passing through the linear polarization layer 10 and the optical characteristic changing layer 20, then passing through the anisotropic material layer 40, and finally passing through the refractive index matching layer 30 to enter the human eye.
Therefore, in this embodiment, the imaging optical path of the near-eye display image and the imaging optical path of the external transmission image are set to be different optical paths, and on the premise that one optical path is not changed, the optical path of the other optical path is changed, so that the purpose of respectively adjusting the image distances of the near-eye display image and the external transmission image in human eyes is achieved. The near-eye display image distance is adjusted to be within the range of the eye photopic vision distance, and meanwhile, the propagation of the external transmission image is not changed, so that the human eyes can see the near-eye display image and the external transmission image clearly, and the imaging quality of the near-eye display system is improved.
As an alternative embodiment, referring to fig. 2, the light characteristic changing layer 20 includes a wire grid polarizing layer 22, and the wire grid polarizing layer 22 is used for changing the propagation direction of light and adjusting the polarization state thereof.
The directions of the light reflection axis of the wire grid polarizing layer 22, the optical axis of the anisotropic material layer 40, and the light absorption axis of the linear polarizing layer 10 are parallel to each other.
It should be noted that the light characteristic changing layer 20 provided in this embodiment may be a wire grid polarizing layer 22, the wire grid polarizing layer 22 has a light transmission axis and a light reflection axis perpendicular to each other, and similar to the linear polarizing layer 10, when a beam of normal light passes through the wire grid polarizing layer 22, a portion of the beam of light having a polarization direction parallel to the light transmission axis may be transmitted through the wire grid polarizing layer 22, and a portion of the beam of light having a polarization direction parallel to the light reflection axis may be reflected by the wire grid polarizing layer 22. The light characteristic changing layer 20 is disposed as the wire grid polarizing layer 22, so that when the light L1 of the light emitting device 50 passes through the wire grid polarizing layer 22, the polarization state of the light changes, and the polarization state of the light is related to the direction of the light reflection axis of the wire grid polarizing layer 22, which is not limited in this embodiment, and only the direction of the light reflection axis of the wire grid polarizing layer 22, the direction of the optical axis of the anisotropic material layer 40, and the direction of the light absorption axis of the linear polarizing layer 10 are parallel to each other.
In the above-mentioned limited case, the light L1 of the light emitting device 50 passes through the wire grid polarizing layer 22 to form a polarized light, the polarized light is parallel to the optical axis of the anisotropic material layer 40 and is reflected by the wire grid polarizing layer 22, so that the light is refracted when passing through the refraction surface 41 of the anisotropic material layer 40, and when entering the human eye, the light can be adjusted to be parallel to each other, thereby ensuring that the near-eye display image distance in the human eye matches the human eye distance, and thus having high definition.
Meanwhile, after the light L2 of the external environment passes through the linear polarization layer 10, a polarized light is also formed, which is different from the polarized light of the light emitting element 50, the polarized light of the external environment is perpendicular to the optical axis direction of the anisotropic material layer 40, so that the light is not reflected when passing through the wire grid polarizer 22, and is not refracted when passing through the refraction surface 41 of the anisotropic material layer 40, so that the light of the external environment entering human eyes is still parallel to each other, thereby ensuring that the external transmission image in human eyes has high definition.
As another alternative embodiment, referring to fig. 1, the light characteristic changing layer 20 includes a quantum rod layer 21, and the quantum rod layer 21 is used to change the color and the propagation direction of light and adjust the polarization state thereof.
The direction of the light absorption axis of the quantum rod layer 21, the direction of the optical axis of the anisotropic material layer 40, and the direction of the light absorption axis of the linear polarization layer 10 are parallel to each other.
It should be noted that, the optical property changing layer 20 provided in this embodiment may also be a quantum rod layer 21, the quantum rod layer 21 may change the color of light, and a specific changing process may be that light irradiates the quantum rod layer 21, and a quantum rod in the quantum rod layer 21 emits fluorescence consistent with the color of the quantum rod under excitation of light. Since the quantum rod has a light absorption axis in a specific direction, when light passes through the quantum rod, light in a polarization state is further formed.
Therefore, by providing the optical property changing layer 20 as the quantum rod layer 21, when the light L1 of the light emitting device 50 passes through the quantum rod layer 21, the polarization state and color of the light are changed, and the polarization state of the light is related to the direction of the light absorption axis of the quantum rod layer 21, which is not limited in this embodiment, only the direction of the light absorption axis of the quantum rod layer 21, the direction of the optical axis of the anisotropic material layer 40, and the direction of the light absorption axis of the linear polarization layer 10 are parallel to each other.
In the above-described limitations, the light L1 of the light emitting element 50 passes through the quantum rod layer 21, and then forms a light beam having a polarization state parallel to the optical axis of the anisotropic material layer 40, and the emission direction is turned back to the human eye direction. Therefore, the light rays are refracted when passing through the refraction surface 41 of the anisotropic material layer 40, so that the light rays can be adjusted to be parallel to each other when entering human eyes, and the near-to-eye display image in the human eyes has high definition.
Meanwhile, after the light L2 of the external environment passes through the linear polarization layer 10, a polarized light is also formed, and unlike the light emitted from the quantum rod layer 21, the polarized light of the external environment is perpendicular to the optical axis direction of the anisotropic material layer 40, so that the light is not refracted when passing through the refraction surface 41 of the anisotropic material layer 40, and thus the light L2 of the external environment entering human eyes is still parallel to each other, thereby ensuring that the external transmission image in human eyes also has high definition.
As an alternative embodiment, the light emitted by the light emitting element 50 may be blue light.
Since blue light has characteristics of high intensity and short wavelength, when the blue light passes through the light characteristic changing layer 20, it can be converted into light of other colors having lower energy, and even if a part of energy is consumed for light characteristic change, the light having changed characteristics still has higher energy, so that setting the light of the light emitting element 50 as blue light can ensure that it has enough energy to perform a light characteristic change process, thereby improving the imaging definition and luminance of a later near-eye display image.
The quantum rod layer 21 is a red quantum rod layer 21 or a green quantum rod layer 21.
It should be noted that, based on blue, green and red being the most basic three colors of the color lights, different color lights can be formed by their harmony with each other, so the present embodiment sets the quantum rod layer 21 as the red quantum rod layer 21 or the green quantum rod layer 21 to form red light and green light.
Further, as illustrated in fig. 2, when the light characteristic changing layer 20 is the wire grid polarizing layer 22, the color of blue light is not changed, and thus a color-rich near-eye display image can be formed by combining the blue light reflected by the wire grid polarizing layer 22 and the red light and the green light emitted by the quantum rod layer 21.
Specifically, referring to fig. 1, the anisotropic material layer 40 provided in the present embodiment is stacked on the surface of the light characteristic changing layer 20 on the side away from the linear polarization layer 10.
Note that, the anisotropic material layer 40 may be attached to a surface of the optical property changing layer 20 on a side away from the linear polarization layer 10, and in this case, a distance from the light emitting element 50 to the optical property changing layer 20 is a thickness of the entire anisotropic material layer 40. The refractive index matching layer 30 is attached to the surface of the anisotropic material layer 40 on the side away from the optical property changing layer 20. In this arrangement, the refraction surface 41 of the anisotropic material layer 40 can be sandwiched between the anisotropic material layer 40 and the refractive index matching layer 30, so that the refraction surface 41 is protected, the refracted light can further pass through the refractive index matching layer 30, and the refractive index matching layer 30 can homogenize the refracted light.
As an achievable embodiment, the refractive surface 41 is a light-transmitting curved surface, and the focal point of the refractive surface 41 is located at the light property-changing layer 20.
It should be noted that, by setting the refraction surface 41 as an arc surface, it can be ensured that the light has a uniform refraction angle in the refraction process, and the occurrence of the condition of reduced or non-uniform light brightness caused by sudden change of the refraction angle is prevented. The arc surface may be a standard spherical arc surface or an aspherical arc surface, which is not limited in this embodiment. By setting the focal point of the refraction surface 41 on the optical property changing layer 20, the distance from the optical property changing layer 20 to human eyes can be adjusted, so that the angle of light entering human eyes can be adjusted, and the light L1 of the light emitting element 50 can form images with high definition in human eyes.
As a preferred embodiment, the light emitting element 50 is disposed at the center of the arc surface.
It should be noted that, when the light emitting element 50 is disposed at the center of the arc, the distances from the light to the edges of the arc are substantially equal, so that the light of the light emitting element 50 can be uniformly distributed on the light characteristic changing layer 20, thereby ensuring that the characteristics of the light are stably changed, and ensuring the uniformity of the brightness of the light entering the human eye.
In the display unit provided by the first embodiment of the present invention, the linear polarization layer, the optical characteristic changing layer, the anisotropic material layer, and the refractive index matching layer are stacked. And through setting up the light characteristics change layer into the wire grid polarization layer that can change the light polarization state and can adjust the quantum rod layer of light polarization state and colour to when light of light-emitting component passes through the light characteristics change layer, the light characteristics change, and the light of this characteristic can be refracted in anisotropic material layer refracting surface department, thereby change the angle and the luminance of the light that gets into human eye. After the light of the external environment passes through the linear polarization layer, the light characteristics are also changed, and the light with the characteristics can not be refracted at the refraction surface, so that the ambient light entering human eyes can not be changed. Through the light adjusting process, the light angle of the light emitting element entering human eyes can be adjusted, and meanwhile, light of the external environment is not affected, so that the near-to-eye display image and the external transmission image in the human eyes are guaranteed to have high display brightness and definition.
Example two
Fig. 3 is a schematic structural diagram of a display unit provided with a quantum rod layer according to a second embodiment of the present invention. Referring to fig. 3, on the basis of the first embodiment, a display unit 100 with another structure is further provided in the second embodiment of the present invention, and compared with the first embodiment, the difference between the first embodiment and the second embodiment is: the refractive index matching layer 30 and the anisotropic material layer 40 are disposed at different positions.
Specifically, the refractive index matching layer 30 is disposed in a stacked manner between the anisotropic material layer 40 and the optical property changing layer 20.
As shown in fig. 3, the refractive index matching layer 30 is attached to the surface of the optical property changing layer 20 on the side away from the linear polarization layer 10, and the distance from the light emitting element 50 to the optical property changing layer 20 is the thickness of the entire refractive index matching layer 30. The anisotropic material layer 40 is attached to the surface of the refractive index matching layer 30 on the side away from the optical property changing layer 20. In this arrangement, the refractive surface 41 is curved toward the linear polarization layer 10.
Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.
In the display unit provided in the second embodiment of the present invention, the linear polarization layer, the optical characteristic changing layer, the refractive index matching layer, and the anisotropic material layer are stacked. Through setting up the light characteristics change layer into the wire grid polarization layer that can change the light polarization state and can adjust the quantum rod layer of light polarization state and colour to when light emitting component's light passes through the light characteristics change layer, the light characteristics change, and the light of this characteristic can be in anisotropic material layer refraction face department refraction emergence refraction, thereby change the angle and the luminance of the light that gets into people's eye. After the light of the external environment passes through the linear polarization layer, the light characteristics are also changed, and the light with the characteristics can not be refracted at the refraction surface, so that the ambient light entering human eyes can not be changed. Through foretell light adjustment process, can adjust the virtual image distance that light emitting component got into people's eye, do not produce any influence to external environment light simultaneously to it all has higher definition to guarantee near-to-eye display image and external transmission image among people's eye. Furthermore, the relative positions of the anisotropic material layer and the refractive index matching layer on the optical characteristic changing layer are interchanged, so that the flexibility of the structure of the display unit can be improved, and the preparation difficulty and the assembly difficulty of the display unit are reduced.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a near-eye display optical module according to a third embodiment of the present invention. Referring to fig. 4, on the basis of the first embodiment and the second embodiment, a third embodiment of the present invention further provides a near-eye display optical module 200, where the near-eye display optical module 200 includes the display unit 100.
Specifically, in the near-eye display optical module 200, the plurality of display units 100 includes at least one first display unit 201 provided with the wire grid polarization layer 22, at least one second display unit 202 provided with the red quantum rod layer 21, and at least one third display unit 203 provided with the green quantum rod layer 21.
The first display unit 201, the second display unit 202, and the third display unit 203 are tiled in an array arrangement, wherein light emitted by the light emitting elements of the first display unit, the second display unit, and the third display unit is blue light.
It should be noted that, the first display unit 201, the second display unit 202, and the third display unit 203 of the near-eye display optical module 200 provided in this embodiment are respectively used for forming blue, red, and green images in human eyes, and by arranging the three display units 100 in an array, blue, red, and green light rays can be mixed to form a preset image.
The number of the first display unit 201, the second display unit 202, and the third display unit 203 in the near-eye display optical module 200 can be set according to needs, which is not limited in this embodiment. Also, fig. 4 only shows an achievable arrangement of the three display units, and in an actual setting, the arrangement may be set as required, and the present embodiment also does not limit this.
Other technical features are the same as those of the first embodiment and the second embodiment, and the same technical effects can be achieved, and are not described in detail herein.
In the near-to-eye display optical module provided by the third embodiment of the present invention, the at least one first display unit provided with the wire grid polarization layer, the at least one second display unit provided with the red quantum rod layer, and the at least one third display unit provided with the green quantum rod layer are tiled in an array arrangement, so that a preset color image can be formed in human eyes.
Example four
On the basis of the first embodiment, the second embodiment and the third embodiment, a near-eye display system is further provided in the fourth embodiment of the present invention, and includes the near-eye display optical module.
In particular, the near-eye display system may further include a controller, a power source, and a head-mounted device. The light-emitting element in the near-eye display optical module can play a role similar to a single or a plurality of display pixels on a display screen, the controller and the power supply are arranged in the head-mounted equipment, the light-emitting element in the near-eye display optical module is electrically connected with the controller, a picture to be projected into human eyes is displayed according to a control signal sent by the controller, and light rays of the picture are projected into the human eyes through the near-eye display optical module, so that a near-eye display image is formed in the human eyes. Simultaneously, light of an external environment enters the near-eye display optical module through the head-mounted equipment, so that an external transmission image is formed in human eyes, the near-eye display image and the external transmission image are superposed in retinas of the human eyes, and a user can see a virtual image of the display screen and an external real environment image simultaneously. The power supply is connected with the controller and supplies power to the light-emitting element in the near-eye display optical module through the controller.
Other technical features are the same as those of the first embodiment, the second embodiment and the third embodiment, and the same technical effects can be achieved, and are not described in detail herein.
In the near-eye display system provided by the fourth embodiment of the present invention, by providing the near-eye display optical module, the distance of a virtual image of the light emitting element entering human eyes can be adjusted by the display unit, so as to match the range of the photopic vision distance of human eyes. Meanwhile, the external ambient light is not influenced, so that the near-to-eye display image and the external transmission image in human eyes have high definition, and the imaging quality of the near-to-eye display system is improved.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A display unit is characterized by comprising a linear polarization layer, an optical characteristic changing layer and a functional layer which are sequentially stacked;
a curved surface is arranged in the functional layer, and the curved surface forms a refraction surface;
the refraction surface is provided with a light-emitting element, the light-emitting direction of the light-emitting element faces the light characteristic changing layer, the light of external environment light sequentially passes through the linear polarization layer, the light characteristic changing layer and the functional layer, and the light emitted by the light-emitting element passes through the light characteristic changing layer and the functional layer, is refracted at the refraction surface and then is parallel to the light of the external environment light;
the functional layer includes an anisotropic material layer that does not refract external ambient light passing through the linear polarization layer at the refraction surface and refracts light emitted from the light emitting element passing through the optical property changing layer at the refraction surface.
2. The display unit of claim 1, wherein the functional layer comprises an index matching layer;
the anisotropic material layer is stacked between the refractive index matching layer and the optical property changing layer;
alternatively, the refractive index matching layer is laminated between the anisotropic material layer and the optical property changing layer.
3. The display unit according to claim 2, wherein the interface between the anisotropic material layer and the refractive index matching layer is the curved surface, and the curved surface has a curved direction toward the refractive index matching layer.
4. The display unit according to claim 3, wherein the light property changing layer comprises a wire grid polarizing layer for changing a propagation direction of light emitted from the light emitting element and adjusting a polarization state of the light;
the direction of the light reflection axis of the wire grid polarizing layer, the direction of the optical axis of the anisotropic material layer and the direction of the light absorption axis of the linear polarizing layer are parallel to each other.
5. The display unit according to claim 3, wherein the light property changing layer comprises a quantum rod layer for changing a color and a propagation direction of light emitted from the light emitting element and adjusting a polarization state of the light;
the direction of the light absorption axis of the quantum rod layer, the direction of the optical axis of the anisotropic material layer and the direction of the light absorption axis of the linear polarization layer are parallel to each other.
6. The display unit of claim 5, wherein the light emitted by the light emitting element is blue light and the quantum rod layer is a red quantum rod layer or a green quantum rod layer.
7. The display unit according to any one of claims 1 to 6, wherein the refractive surface is a light-transmissive curved surface, and a focal point of the refractive surface is located on the light property changing layer.
8. The display unit according to any one of claims 1 to 6, wherein the light emitting element is provided at a central position of the refractive surface.
9. A near-eye display optical module comprising a plurality of display units according to any of claims 1-8, including at least one first display unit provided with a wire grid polarizer layer, at least one second display unit provided with a red quantum rod layer, and at least one third display unit provided with a green quantum rod layer;
the first display unit, the second display unit and the third display unit are tiled in an array arrangement mode, wherein light emitted by the light emitting elements of the first display unit, the second display unit and the third display unit is blue light.
10. A near-eye display system comprising the near-eye display optical module of claim 9.
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| US9582922B2 (en) * | 2013-05-17 | 2017-02-28 | Nvidia Corporation | System, method, and computer program product to produce images for a near-eye light field display |
| US9581821B2 (en) * | 2014-06-24 | 2017-02-28 | Fakespace Labs, Inc. | Head mounted augmented reality display |
| US10317215B2 (en) * | 2015-01-09 | 2019-06-11 | Boe Technology Group Co., Ltd. | Interactive glasses and navigation system |
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| CN104781723A (en) * | 2012-08-21 | 2015-07-15 | 3M创新有限公司 | Viewing device |
| CN108345138A (en) * | 2017-01-24 | 2018-07-31 | 京东方科技集团股份有限公司 | A kind of display device and display methods |
| CN107490862A (en) * | 2017-03-23 | 2017-12-19 | 华为机器有限公司 | Near-to-eye and near-eye display system |
| CN108227209A (en) * | 2017-09-30 | 2018-06-29 | 北京蚁视科技有限公司 | A kind of nearly eye dual channel optical systems |
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