CN112269298A - Curved surface projection optical system - Google Patents
Curved surface projection optical system Download PDFInfo
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- CN112269298A CN112269298A CN202011329534.0A CN202011329534A CN112269298A CN 112269298 A CN112269298 A CN 112269298A CN 202011329534 A CN202011329534 A CN 202011329534A CN 112269298 A CN112269298 A CN 112269298A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/10—Projectors with built-in or built-on screen
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0852—Catadioptric systems having a field corrector only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0896—Catadioptric systems with variable magnification or multiple imaging planes, including multispectral systems
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a curved surface projection optical system, which comprises a micro display chip, wherein a prism equivalent unit, a first sub-optical system serving as a refraction optical system and a second sub-optical system serving as a reflection optical system are sequentially arranged on one side of the emergent light path direction of the micro display chip, and a concave spherical screen is arranged on the other side of the micro display chip; the micro-display chip is an object of a curved surface projection optical system, an amplified real image is formed through a first sub-optical system and is called a first real image, the first real image is formed into a final amplified real image through a second sub-optical system and is projected and imaged to a screen, the focal power of the second sub-optical system is not zero, and the first real image and the final real image are positioned on the same side of the second sub-optical system. The curved surface projection optical system can realize the maximized enhancement of the impression immersion degree, thereby improving the impression experience of audiences.
Description
Technical Field
The invention relates to the technical field of curved surface projection systems, in particular to a curved surface projection optical system.
Background
Compared with other display technologies, the projection display is more adequate for large size, and the projection screen size covers 40 inches to 300 inches. At the same time, the resolution of projection displays continues to increase, moving from 480p in the first place to 4k at present, and 8k in the future. The projection ratio of the projection display system is continuously reduced from 1 to 0.4, and optical systems having a projection ratio of less than 0.4 are called ultra-short-focus systems, and as disclosed in CN101395516, projection optical systems having a projection ratio of less than 0.4 are known, and can project a screen of 100 inches or more in a space of 1 meter.
There are several aspects of the desire for display technology, in addition to large display sizes and high resolution, richer colors and more realistic immersion are also desired. The narrower the spectral band of the projection display light source is, the richer the displayed colors are, the spectral band widths are arranged from large to small, and the high-pressure mercury lamp > led light source > laser light source.
At present, projection display systems based on ultra-short focus have no technical scheme for enhancing the impression and immersion degree. Therefore, the invention provides an optical system for displaying pictures by adopting concave spherical projection, so as to enhance the sense of immersion.
Disclosure of Invention
The invention aims to overcome the defects in the background art and provide a curved surface projection optical system which can effectively enhance the impression and immersion degree so as to meet more use requirements of users.
In order to achieve the technical effects, the invention adopts the following technical scheme:
a curved surface projection optical system comprises a micro display chip, wherein a prism equivalent unit, a first sub optical system serving as a refraction optical system and a second sub optical system serving as a reflection optical system are sequentially arranged on one side of the micro display chip in the direction of an emergent light path, and a concave spherical screen is arranged on the other side of the micro display chip; the micro-display chip is an object of a curved surface projection optical system, an amplified real image is formed through a first sub-optical system and is called a first real image, the first real image is formed into a final amplified real image through a second sub-optical system and is projected and imaged to a screen, wherein the focal power of the second sub-optical system is not zero, and the first real image and the final real image are positioned on the same side of the second sub-optical system.
Further, the focal length of the curved projection optical system is F, and the following conditions are satisfied:
Further, the radius of the screen is R, the diagonal length of the final real image is H, and then R and H satisfy the following relationship:
specifically, the viewing distance is generally 1 to 5 times of the diagonal line of the picture, the curvature radius of the curved screen should be equal to or exceed the viewing distance, and R reaches 4 times of the viewing distance, so that the immersion feeling brought by the curved surface is improved very weakly.
Furthermore, the first sub-optical system and the second sub-optical system are correspondingly composed of a plurality of aspheric lenses and aspheric reflectors.
Further, the shapes of all the aspherical lenses and the aspherical mirror surfaces of the curved surface projection optical system are represented by the following curve equations:
the aspheric surface represented by the curve equation is a rotationally symmetric aspheric surface, and the Z axis is taken as a symmetry axis, wherein Z (r) represents the rise of the curved surface in the Z axis direction, r represents the rotation radius of any point of the curved surface, c is the curvature of the curved surface, k is a conic constant, and A, B, C, D, E, F, G, H, J is a high-order coefficient of the aspheric surface.
Compared with the prior art, the invention has the following beneficial effects:
the curved surface projection optical system can be particularly applied to a spherical surface projection optical system, the screen of the curved surface projection optical system is in a concave surface state relative to audiences, the curved surface projection optical system is a novel screen presentation mode, and the curved surface projection optical system can achieve the purpose of enhancing the impression immersion degree to the maximum extent, so that the impression experience of the audiences is improved.
Drawings
Fig. 1 is a schematic view of a curved projection display of the curved projection optical system of the present invention.
Fig. 2 is a schematic optical path diagram of a curved projection optical system according to the first embodiment.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a schematic diagram of a square wave modulation transfer function of the curved projection optical system according to the first embodiment.
Fig. 5 is a schematic diagram of a distortion curve of the curved projection optical system according to the first embodiment.
Fig. 6 is a schematic optical path diagram of a curved projection optical system according to a second embodiment.
Fig. 7 is a schematic diagram of a square wave modulation transfer function of the curved projection optical system according to the second embodiment.
Fig. 8 is a schematic diagram showing a distortion curve of the curved projection optical system according to the second embodiment.
Fig. 9 is a schematic optical path diagram of a curved surface projection optical system of the third embodiment.
Fig. 10 is a schematic diagram of a square-wave modulation transfer function of a curved projection optical system according to a third embodiment.
Fig. 11 is a schematic diagram showing a distortion curve of the curved projection optical system of the third embodiment.
Reference numerals: 1-curved surface projection optical system, 2-screen, 100-micro display chip, 200-prism equivalent unit, 300-first sub-optical system, 400-second sub-optical system, and 500-first real image.
Detailed Description
The invention will be further elucidated and described with reference to the embodiments of the invention described hereinafter.
Example (b):
as shown in fig. 1, a curved surface projection optical system 1 includes a micro display chip 100, and a prism equivalent unit 200, a first sub-optical system 300 as a refractive optical system, and a second sub-optical system 400 as a reflective optical system are sequentially disposed along one side of an exit optical path direction of the micro display chip, and a concave spherical surface shaped screen 2 is disposed on the other side of the micro display chip; the micro-display chip is an object of a curved surface projection optical system, an amplified real image is formed through a first sub-optical system and is called as a first real image 500, the first real image is formed into a final amplified real image through a second sub-optical system and is projected and imaged to a screen, wherein the focal power of the second sub-optical system is not zero, and the first real image and the final real image are positioned on the same side of the second sub-optical system.
Specifically, in this embodiment, the focal length of the curved projection optical system is F, and the following conditions are satisfied:
In a projection imaging optical system, when a projection image has a fixed size, the distortion and the magnification chromatic aberration of the whole system continuously increase along with the reduction of the focal length, and generally, the projection display requires the distortion of the whole image<0.5%, chromatic aberration of magnification<1 pixel, in this scheme, projection lens focus is F, and the chip diagonal is H, and projection picture diagonal is H, and the distance of projection lens to projection picture is L, then:
change to
In most cases, it is desirable to obtain a large projection image at a small projection distance, but in this case, it is difficult for the optical design to satisfy both the resolution and distortion requirements, and generally, the ratio of the projection image diagonal to the projection distance is less than 8, and in extreme cases, less than 10.
For a total-refraction lens, the ratio of the projection image diagonal to the projection distance is generally less than 1.5, and even if a free-form lens is adopted, the ratio is less than 2.5. For example, a 0.65 inch chip, a 2m projection distance, and a display screen of 120 inches, which are already refractive short-focus designs, the focal length of the lens is 10.8mm, and the ratio of the projection screen diagonal to the lens distance is 1.52.
Specifically, in this embodiment, the radius of the screen is R, and the diagonal length of the final real image is H, then R and H satisfy the following relationship:
in practice, the viewing distance is typically 1 to 5 times the diagonal of the picture, and the radius of curvature of the curved screen should equal or exceed the viewing distance; r reaches sight shadow distance 4 times, and then the sense of immersing that the curved surface brought promotes just very weakly, consequently, sets for R and H in this scheme and satisfies as above-mentioned relation, the sense of immersing that the promotion curved surface that can be biggest brought.
In this embodiment, the first sub-optical system and the second sub-optical system are correspondingly composed of a plurality of aspheric lenses and aspheric reflectors. The shapes of all the aspheric lens and the aspheric mirror surface of the curved surface projection optical system are represented by the following curve equations:
the aspheric surface expressed by the curve equation is a rotationally symmetric aspheric surface and takes a Z axis as a symmetry axis, wherein Z (r) represents the rise of the curved surface in the Z axis direction, r represents the rotation radius of any point of the curved surface, c is the curvature of the curved surface, k is a conic constant, and A, B, C, D, E, F, G, H, J is a high-order coefficient of the aspheric surface.
The first embodiment is as follows:
as shown in fig. 2 and fig. 3, which are schematic diagrams of the optical path of the curved surface projection optical system of the present embodiment, in the curved surface projection optical system of the present embodiment, the focal length F of the whole curved surface projection optical system is 3.966mm, and the length of the diagonal line h of the display chip is 17.6mm, which satisfies the requirement
The diagonal H of the projection display picture is 2550mm, the radius R of the spherical screen is 5000mm, and the relation also satisfies the relation
In the present embodiment, the shapes of all the aspherical lenses and the aspherical mirror surfaces are represented by the following curve equations:
the aspheric surface expressed by the curve equation is a rotationally symmetric aspheric surface and takes a Z axis as a symmetry axis, wherein Z (r) represents the rise of the curved surface in the Z axis direction, r represents the rotation radius of any point of the curved surface, c is the curvature of the curved surface, k is a conic constant, and A, B, C, D, E, F, G, H, J is a high-order coefficient of the aspheric surface.
Specifically, in the curved surface projection optical system of the present embodiment, the specific optical structure parameter table is specifically shown in table 1, and each aspheric coefficient is specifically shown in table 2.
Table 1 (optical structure parameter table):
table 2: (aspherical surface coefficient Table)
Specifically, as shown in fig. 4, it can be seen that, at the projection image, the transfer function of the 1 line pair exceeds 0.6, and meets the requirement of native 4k resolution or pixel drift 8k projection display, and meanwhile, in this embodiment, the height of the inner ring is 2.3mm, the height of the outer ring is 13.36mm, and the specific distortion curve is shown in fig. 5, it can be seen that the distortion of the full field is controlled within 0.5%, and meets the requirement of use.
Example two
As shown in fig. 6, which is a schematic diagram of an optical path of the curved surface projection optical system of this embodiment, in the curved surface projection optical system of this embodiment, a focal length F of the entire curved surface projection optical system is 3.961mm, and a maximum object height (i.e., a diagonal length of a display chip) h is 17.6mm, which satisfies the requirement
The diagonal H of the projection display picture is 2550mm, the radius R of the spherical screen is 8000mm, and the relation also satisfies the relation
In the present embodiment, the shapes of all the aspherical lenses and the aspherical mirror surfaces are represented by the following curve equations:
the aspheric surface expressed by the curve equation is a rotationally symmetric aspheric surface and takes a Z axis as a symmetry axis, wherein Z (r) represents the rise of the curved surface in the Z axis direction, r represents the rotation radius of any point of the curved surface, c is the curvature of the curved surface, k is a conic constant, and A, B, C, D, E, F, G, H, J is a high-order coefficient of the aspheric surface.
Specifically, in the curved surface projection optical system of the present embodiment, the specific optical structure parameter table is specifically shown in table 3, and each aspheric coefficient is specifically shown in table 4.
Table 3 (optical structure parameter table):
table 4: (aspherical surface coefficient Table)
Specifically, as shown in fig. 7, it can be seen that, at the projection image, the transfer function of the 1 line pair exceeds 0.6, and meets the requirement of native 4k resolution or pixel drift 8k projection display, and meanwhile, in this embodiment, the height of the inner ring is 2.3mm, the height of the outer ring is 13.36mm, and the specific distortion curve is shown in fig. 8, it can be seen that the distortion of the full field is controlled within 0.5%, and meets the requirement of use.
EXAMPLE III
As shown in fig. 9, which is a schematic diagram of an optical path of the curved surface projection optical system of this embodiment, in the curved surface projection optical system of this embodiment, a focal length F of the entire curved surface projection optical system is 3.955mm, and a maximum object height (i.e., a diagonal length of a display chip) h is 17.6mm, which satisfies the requirement
The diagonal H of the projection display picture is 2550mm, the radius R of the spherical screen is 10000mm, and the relation also satisfies
In the present embodiment, the shapes of all the aspherical lenses and the aspherical mirror surfaces are represented by the following curve equations:
the aspheric surface expressed by the curve equation is a rotationally symmetric aspheric surface and takes a Z axis as a symmetry axis, wherein Z (r) represents the rise of the curved surface in the Z axis direction, r represents the rotation radius of any point of the curved surface, c is the curvature of the curved surface, k is a conic constant, and A, B, C, D, E, F, G, H, J is a high-order coefficient of the aspheric surface.
Specifically, in the curved surface projection optical system of the present embodiment, the specific optical structure parameter table is specifically shown in table 5, and each aspheric coefficient is specifically shown in table 6.
Table 5 (optical structure parameter table):
table 6: (aspherical surface coefficient Table)
Specifically, as shown in fig. 10, it can be seen that, at the projection image, the transfer function of the 1 line pair exceeds 0.6, and meets the requirement of native 4k resolution or pixel shift 8k projection display, and meanwhile, in this embodiment, the height of the inner ring is 2.3mm, the height of the outer ring is 13.36mm, and the specific distortion curve is shown in fig. 11, it can be seen that the distortion of the full field is controlled within 0.5%, and meets the requirement of use.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (5)
1. A curved surface projection optical system is characterized by comprising a micro display chip, wherein a prism equivalent unit, a first sub-optical system serving as a refraction optical system and a second sub-optical system serving as a reflection optical system are sequentially arranged on one side of the emergent light path direction of the micro display chip, and a concave spherical screen is arranged on the other side of the micro display chip; the micro-display chip is an object of a curved surface projection optical system, an amplified real image is formed through a first sub-optical system and is called a first real image, the first real image is formed into a final amplified real image through a second sub-optical system and is projected and imaged to a screen, wherein the focal power of the second sub-optical system is not zero, and the first real image and the final real image are positioned on the same side of the second sub-optical system.
2. The curved projection optical system according to claim 1, wherein the focal length of the curved projection optical system is F, and the following condition is satisfied:
3. The curved surface projection optical system according to claim 1, wherein the radius of the screen is R, the diagonal length of the final real image is H, and then R and H satisfy the following relationship:
4. a curved projection optical system according to claim 1, wherein said first and second sub-optical systems are respectively composed of aspheric lenses and aspheric mirrors.
5. A curved projection optical system according to claim 4, wherein the shape of all aspheric lens and aspheric mirror surfaces of the curved projection optical system is represented by the following curve equation:
the aspheric surface represented by the curve equation is a rotationally symmetric aspheric surface, and the Z axis is taken as a symmetry axis, wherein Z (r) represents the rise of the curved surface in the Z axis direction, r represents the rotation radius of any point of the curved surface, c is the curvature of the curved surface, k is a conic constant, and A, B, C, D, E, F, G, H, J is a high-order coefficient of the aspheric surface.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114979606A (en) * | 2022-08-01 | 2022-08-30 | 北京数字光芯集成电路设计有限公司 | Micro-projection system with pixel enhancement function based on micro-display chip |
| WO2022218390A1 (en) * | 2021-04-14 | 2022-10-20 | 深圳海翼智新科技有限公司 | Projection device, projection lens assembly and projection system |
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