CN110515215B - Ultrathin optical module and ultrathin display device - Google Patents
Ultrathin optical module and ultrathin display device Download PDFInfo
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- CN110515215B CN110515215B CN201910925736.2A CN201910925736A CN110515215B CN 110515215 B CN110515215 B CN 110515215B CN 201910925736 A CN201910925736 A CN 201910925736A CN 110515215 B CN110515215 B CN 110515215B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 claims abstract description 16
- 206010010071 Coma Diseases 0.000 claims abstract description 12
- 206010073261 Ovarian theca cell tumour Diseases 0.000 claims abstract description 8
- 208000001644 thecoma Diseases 0.000 claims abstract description 8
- 238000003384 imaging method Methods 0.000 claims abstract description 6
- 239000002061 nanopillar Substances 0.000 claims description 36
- 230000004075 alteration Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000003086 colorant Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- -1 tiO 2 Inorganic materials 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
- G02B27/4211—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant correcting chromatic aberrations
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Abstract
The invention discloses an ultrathin optical module and an ultrathin display device, wherein the ultrathin optical module comprises: the transparent substrate comprises a transparent substrate, a first super surface arranged on any surface of the transparent substrate, and a second super surface arranged on the other surface of the transparent substrate; the first super surface has a lens function and can focus, converge and image light rays from the image unit; the second super surface has a coma correction function and is used for eliminating coma of the light rays and improving display effect. According to the invention, the super-surface structures with different functions are respectively arranged on the two side surfaces of the light-transmitting substrate, so that ultra-short focal imaging can be realized, the system length is effectively reduced, meanwhile, the coma influence of light rays with large field angle can be eliminated, and the portability and display effect of the system are improved.
Description
Technical Field
The present invention relates to the field of display devices, and in particular, to an ultrathin optical module and an ultrathin display device.
Background
Current VR/AR displays typically utilize a combination of a lens assembly and a display screen to achieve a magnified image, and in order to reduce system size and improve portability, there are also solutions that utilize fresnel lenses instead of conventional lenses. The fresnel lens technology has limited volume that can be reduced and its structure has a plurality of steps and is not a planarization structure. The light wave modulation can be realized in a planar structure by utilizing the diffraction optical elements (DOE, diffractive Optical Elements), so that the system volume can be reduced as much as possible, and the comfort level of wearing VR/AR equipment is improved.
The diffractive optical element is designed for a small spectral range and angle range, so chromatic aberration and coma exist in use, and for a VR/AR display system, RGB three colors are required to have good display effect and large viewing angle and magnification. With the diffraction method, a single structure is difficult to satisfy such a demand.
Accordingly, the prior art has shortcomings and needs improvement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an ultrathin optical module and an ultrathin display device.
The technical scheme of the invention is as follows: provided is an ultra-thin optical module, including: the transparent substrate comprises a transparent substrate, a first super surface arranged on any surface of the transparent substrate, and a second super surface arranged on the other surface of the transparent substrate;
the first super surface has a lens function and is used for focusing, converging and imaging light rays from the image unit;
the second super surface has a coma correction function and is used for eliminating coma of the light rays and improving display effect.
Further, the first supersurface comprises a plurality of microstructure elements arranged periodically; the second supersurface comprises a plurality of microstructure elements arranged periodically.
Further, a plurality of the microstructure elements in one arrangement period are used for phase modulating light of a single wavelength; or alternatively, the first and second heat exchangers may be,
a plurality of the microstructure units in one arrangement period are used for carrying out phase modulation on light with multiple wavelengths, and the microstructure units have different feature sizes.
Further, the microstructure unit is a cylindrical nano-pillar, or the microstructure unit is a cuboid nano-pillar.
Further, a characteristic parameter of one of the microstructure units corresponds to a phase modulation of the same wavelength light or different wavelengths light, and when the microstructure unit is a cylindrical nano-pillar, different characteristic parameters are formed by different characteristic dimensions of the cylindrical nano-pillar; when the microstructure unit is a cuboid nano-column, different characteristic parameters are formed through different characteristic dimensions and/or different rotation angles of the cuboid nano-column.
Further, the characteristic dimensions of the cylindrical nano-pillars are different including:
the diameter of the cylindrical nano-pillars is different, or the height of the cylindrical nano-pillars is different.
Further, when the microstructure unit is a cuboid nano-pillar, the feature size of the cuboid nano-pillar is in the range of 50 nm-1 um.
Further, the characteristic parameter of one microstructure unit corresponds to one phase modulation of the light with the same wavelength or the light with different wavelengths, and the expression of the phase modulation function corresponding to one microstructure unit is as follows:
the phase modulation degree is lambda is wavelength, f is lens focal length, and r is radial length in polar coordinates.
Further, the first super surface is arranged on the surface of the transparent substrate, which is close to one side of the image unit, and the second super surface is arranged on the surface of the transparent substrate, which is far away from one side of the image unit.
The invention also provides an ultrathin display device which comprises an image unit and the ultrathin optical module, wherein the image unit and the ultrathin optical module are oppositely arranged.
By adopting the scheme, the super-surface structures with different functions are respectively arranged on the two side surfaces of the light-transmitting substrate, so that ultra-short focal imaging can be realized, the system length is effectively reduced, meanwhile, the coma influence of light rays with large field angles can be eliminated, and the portability and the display effect of the system are improved.
Drawings
FIG. 1 is a schematic diagram of an ultrathin display device according to the invention;
FIG. 2 is a schematic diagram of a microstructure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another embodiment of a microstructure element according to the present invention;
FIG. 4 is a top view of one embodiment of a microstructure element of the invention;
FIG. 5 is a side view of one embodiment of a microstructure element of the invention;
FIG. 6 is a graph of radius versus phase modulation according to an embodiment of the present invention;
FIG. 7 is a schematic view illustrating a rotation angle of a microstructure unit according to an embodiment of the invention;
FIG. 8 is a schematic diagram of a microstructure having tri-color phase modulation according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of another embodiment of a microstructure element with tri-color phase modulation according to the present invention;
fig. 10 is a diagram of the effect of the optical path before coma correction;
fig. 11 is a view of the optical path effect after coma correction.
Detailed Description
The invention will be described in detail below with reference to the drawings and the specific embodiments.
Before describing embodiments of the present invention in detail, the definition of "supersurface" will be described. A super surface is a type of Diffractive Optical Element (DOE) that can achieve phase modulation of light by a planar structure, enabling a great reduction in the volume of the optical element. Hereinafter, the present invention will be described in detail with reference to specific examples.
Referring to fig. 1, the present invention provides an ultra-thin display device and an ultra-thin optical module, the ultra-thin display device includes an image unit 5 and the ultra-thin optical module, wherein the image unit 5 is disposed opposite to the ultra-thin optical module, and in particular, the display device may be an AR display device or a VR display device.
The ultrathin optical module specifically comprises: the transparent substrate 1, a first super surface 2 arranged on any surface of the transparent substrate 1, and a second super surface 3 arranged on the other surface of the transparent substrate 1. The first super surface 2 has a lens function, and can focus, converge and image light from an image unit, and the lens manufactured by the method can have a larger Numerical Aperture (NA), so that the system length can be effectively reduced, and the portability can be improved; the second super surface 3 has a coma correction function, and is used for eliminating the coma of the light ray, and improving the display effect.
As shown in fig. 1, in one embodiment, the first supersurface 2 is provided on the surface of the transparent substrate 1 on the side close to the image unit 5, and the second supersurface 3 is provided on the surface of the transparent substrate 1 on the side away from the image unit 5. Of course, the arrangement positions of the first and second supersurfaces 2 and 3 may also be exchanged.
According to the embodiment of the invention, the super-surface structures with different functions are respectively arranged on the two side surfaces of the light-transmitting substrate 1, so that ultra-short focal imaging can be realized, the system length is effectively reduced, meanwhile, the coma influence of light rays with large field angles can be eliminated, and the portability and the display effect of the system are improved.
Referring to fig. 2 to 5, the super surface may specifically be composed of a plurality of microstructure units periodically arranged in a plane. A plurality of microstructure elements are included in one arrangement period. The microstructure elements can be used for phase modulating light of a single wavelength, i.e. for phase modulating monochromatic light, and also for phase modulating light of multiple wavelengths, i.e. for phase modulating polychromatic light. The microstructure unit may be made of materials including: si, a-Si, tiO 2 ，SiO 2 Etc.
When the microstructure units are subjected to phase modulation, different phase modulation degrees are distinguished by different characteristic parameters, that is, one characteristic parameter of each microstructure unit can correspond to one phase modulation of light with a single wavelength or one phase modulation of light with a certain wavelength in multiple wavelengths. Depending on the different forms of the microstructure elements (cylindrical or rectangular nanopillars), different characteristic parameters may be determined by the rotation angle or the characteristic dimensions, as will be described in detail below. In one arrangement period, each microstructure unit has different phase modulation degrees, and the microstructure units with different characteristic parameters are arranged in a plane to realize the functions of lenses or other optical elements (such as coma correction mirrors). The lens manufactured by the method can break through the limitation (material, surface shape and the like) of the common lens, and the focal length can be smaller than that of the common lens under the same caliber, so that the total length of the optical system is reduced.
In a specific implementation, the first supersurface 2 comprises a plurality of microstructure elements 41 arranged periodically, and the second supersurface 3 comprises a plurality of microstructure elements 41 arranged periodically. As shown in fig. 3, a plurality of microstructure elements 41 are included in one arrangement period. The first or second supersurface comprises a plurality of microstructure elements arranged in an arrangement periodic manner.
In the embodiment of the present invention, the microstructure unit 41 may be in the form of a cylindrical nano-pillar (as shown in fig. 3) or a rectangular nano-pillar (as shown in fig. 2). Since one characteristic parameter of one microstructure element can correspond to one phase modulation of the same wavelength light or different wavelength light, different phase modulation degrees are distinguished by different characteristic parameters (dimensions, rotation angles) of the microstructure element in particular when the phase modulation is performed. The microstructure elements 41 are presented differently, and there is a certain difference in the respective characteristic parameter differentiation manners.
Specifically, when the microstructure unit 41 is a cylindrical nano-pillar, since the cylinder is a central symmetry structure, different characteristic parameters can only be represented by the characteristic dimensions of the cylindrical nano-pillar (as shown in fig. 3), and the cylindrical nano-pillar with different characteristic dimensions represents different characteristic parameters, so as to correspond to different phase modulation degrees. Specifically, the characteristic dimensions of the cylindrical nano-pillars include the diameter and height of the cylindrical nano-pillars; for example, microstructure elements of different characteristic parameters can be characterized by different diameters or different heights of the cylindrical nanopillars. The diameter of the cylindrical nano-pillars is in the order of hundred nanometers.
When the microstructure unit 41 is a cuboid nano-pillar, the cuboid nano-pillar is of a non-centrosymmetric structure, so that a rotation angle and/or a feature size can be selected when different feature parameters are represented. For example, different characteristic parameters (as shown in fig. 2, 4 and 5) are characterized by using cuboid nano-pillars with different characteristic sizes and/or different rotation angles, so as to correspond to different phase modulation degrees. The feature size (length, width, height) of the cuboid nano-pillars is usually wavelength order, the minimum size is about 50nm, the maximum size is not more than 1um, and the cell period is not more than 1um.
Specifically, in one embodiment, the phase is modulated by rotation of the same sized rectangular parallelepiped nanopillars. That is, the feature sizes of the microstructure elements 41 in one arrangement period are the same (the same height and the same cross-sectional size), but the rotation angles θ are different, and the phase is modulated by changing the rotation angle θ of the microstructure elements 41 in one arrangement period, as shown in fig. 7, which is the angle by which the length direction of the cross section of the rectangular parallelepiped nano-pillar is rotated from the X-axis direction to the Y-axis direction.
Specifically, the cell period of the microstructure unit 41 in this embodiment does not exceed 1um. Taking a cuboid nano-column as an example, under the above conditions, the feature size of the microstructure unit 41 is in the range of 50 nm-1 um, the phase can be adjusted by controlling the rotation angle θ of the microstructure unit 41, and the focusing effect of the lens can be achieved by arranging the microstructure units according to the phase-structure correspondence described later.
As described above, when the microstructure units perform phase modulation, different degrees of phase modulation are distinguished by different characteristic parameters, that is, one characteristic parameter of each microstructure unit may correspond to one phase modulation of light with a single wavelength, or may correspond to one phase modulation of light with a certain wavelength in multiple wavelengths.
In determining the arrangement of the microstructure elements 41, for monochromatic light, the expression of the phase modulation function corresponding to the microstructure elements 41 is:
the phase modulation degree is lambda is wavelength, f is lens focal length, and r is radial length in polar coordinates.Therefore, the arrangement structure of the corresponding microstructure units can be determined only by determining the phase modulation function of the whole super-surface type, and the planarized monochromatic light optical modulation effect is realized. Thus, by adjusting the phase modulation degree of the microstructure units 41 on the first and second supersurfaces 2 and 3, a lens function and a coma correction function are obtained, respectively.
In the case of the microstructure element 41 being a cylindrical nano-pillar, taking the monochromatic light wavelength 660nm as an example, it is assumed that the height of the cylindrical nano-pillar is determined to be 615nm, the radius of the cylinder is related to the phase modulation, the abscissa is the cylinder radius, and the ordinate is the phase modulation, and the structure has a phase modulation of + -0.8pi when the radius is changed from 70nm to 150nm (as shown in fig. 6). In the case where the microstructure element 41 is a rectangular column, the phase modulation depends on the rotation angle θ of the column, specifically, the phase modulation degree under the above conditionsEqual to twice the rotation angle θ of the microstructure elements (as shown in fig. 7).
As described above, the plurality of microstructure units in one arrangement period can perform phase modulation on light with a single wavelength, but the wavelength range and the angle range of the optical module are smaller when the optical module works for monochromatic light. To improve display performance, it is desirable that a plurality of microstructure elements in one arrangement period can perform phase modulation for light of a plurality of wavelengths. For example, it is desirable that a plurality of microstructure units in one arrangement period can modulate RGB three-color light. At this time, the design method is similar to the monochromatic light method.
In a specific design, since the RGB three-color light needs to be phase-modulated at the same time, it is considered that the phases of different color lights are modulated by different feature sizes. That is, when phase modulating polychromatic light, a plurality of microstructure elements within one arrangement period must have different feature sizes. For example, after the characteristic dimensions of each of the three colors of light are determined, the arrangement structure of the microstructure units of each of the three colors of light may be designed for each of the three colors of light according to the design method of the single color of light described above, and then the microstructure units may be specially arranged to form the structure shown in fig. 8 and 9. In fig. 8 and 9, since RGB has different feature sizes, only the structure of the corresponding R portion has a phase modulation effect on red light R, and green light G and blue light B are the same. Therefore, the lenses with three wave bands can be integrated in one plane, and the color display quality is improved.
Referring to fig. 10 and 11, the second super surface 3 can also adjust the phase modulation degree of the microstructure unit 41 in the above manner to implement the coma correction function. Through Zemax simulation, after the second super surface 3 is added, a better coma correction effect can be obtained. The corrected display effect can be effectively improved as can be seen from the comparison diagrams before and after the coma correction.
In summary, by arranging the super-surface structures with different functions on the two side surfaces of the light-transmitting substrate, the invention can realize ultra-short focal imaging, simultaneously can also meet RGB three-color display, eliminate the coma influence of light rays with large angle of view, effectively reduce the system length and improve the portability and display effect.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. An ultra-thin optical module, comprising: the transparent substrate comprises a transparent substrate, a first super surface arranged on any surface of the transparent substrate, and a second super surface arranged on the other surface of the transparent substrate;
the first super surface has a lens function and is used for focusing, converging and imaging light rays from the image unit;
the second super surface has a coma aberration correcting function and is used for eliminating the coma aberration of the light rays and improving the display effect;
the first supersurface comprises a plurality of microstructure elements arranged periodically; the second supersurface comprises a plurality of microstructure elements arranged periodically;
a plurality of the microstructure elements in one arrangement period are used for carrying out phase modulation on single-wavelength light; or alternatively, the first and second heat exchangers may be,
a plurality of the microstructure units in one arrangement period are used for carrying out phase modulation on light with multiple wavelengths, and the microstructure units have different characteristic sizes;
the characteristic parameter of one microstructure unit corresponds to one phase modulation of the light with the same wavelength or the light with different wavelengths, and the expression of the phase modulation function corresponding to one microstructure unit is as follows:
the arrangement mode of a plurality of microstructure units in the arrangement period is determined by the phase modulation function; phi (r) is the phase modulation, lambda is the wavelength, f is the lens focal length, and r is the radial length at polar coordinates.
2. The ultra-thin optical module of claim 1, wherein the microstructure unit is a cylindrical nano-pillar or the microstructure unit is a rectangular nano-pillar.
3. The ultra-thin optical module of claim 2, wherein a characteristic parameter of one of the microstructure units corresponds to a phase modulation of the same wavelength light or different wavelengths light, when the microstructure unit is a cylindrical nano-pillar, different characteristic parameters are formed by different characteristic dimensions of the cylindrical nano-pillar; when the microstructure unit is a cuboid nano-column, different characteristic parameters are formed through different characteristic dimensions and/or different rotation angles of the cuboid nano-column.
4. The ultra-thin optical module of claim 3, wherein the cylindrical nanopillars differ in feature size, comprising: the diameter of the cylindrical nano-pillars is different, or the height of the cylindrical nano-pillars is different.
5. The ultrathin optical module according to claim 2 or 3, wherein when the microstructure unit is a cuboid nano-pillar, the feature size of the cuboid nano-pillar is in a range of 50nm to 1um.
6. The ultra-thin optical module according to claim 1, wherein the first super surface is provided on a surface of the light-transmitting substrate on a side close to the image unit, and the second super surface is provided on a surface of the light-transmitting substrate on a side far from the image unit.
7. An ultra-thin display device comprising an image unit and the ultra-thin optical module of any one of claims 1 to 6, the image unit being disposed opposite the ultra-thin optical module.
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| CN111290164B (en) * | 2020-03-31 | 2024-07-12 | 京东方科技集团股份有限公司 | Transparent display panel, display device and glasses |
| CN113485009B (en) * | 2020-04-24 | 2023-07-18 | 浙江舜宇光学有限公司 | Super-surface imaging device |
| CN112083519A (en) * | 2020-08-24 | 2020-12-15 | 南京理工大学 | Double-layer super-surface coma-aberration-eliminating imaging lens suitable for unmanned aerial vehicle moving shooting |
| CN112684522B (en) * | 2020-11-26 | 2021-12-31 | 中国科学院上海微系统与信息技术研究所 | Ultraviolet and visible light common-lens double-light-path imaging detection system and manufacturing method thereof |
| US11477427B2 (en) * | 2021-01-27 | 2022-10-18 | Huawei Technologies Co., Ltd. | 3D light field displays utilizing micro-LED pixel arrays and metasurface multi-lens arrays |
| CN114142237A (en) * | 2021-04-01 | 2022-03-04 | 友达光电股份有限公司 | Display device |
| CN114296245B (en) * | 2021-12-09 | 2024-03-01 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Raman beam shaping device |
| CN114252991A (en) * | 2022-01-10 | 2022-03-29 | 东南大学 | Super-surface micro-nano near-to-eye display based on retina display |
| CN114911059B (en) * | 2022-06-10 | 2024-08-06 | 京东方科技集团股份有限公司 | Optical display device and head-mounted display device |
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