CN101424777B - Compact optical system of mini projector - Google Patents
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- CN101424777B CN101424777B CN200810162236XA CN200810162236A CN101424777B CN 101424777 B CN101424777 B CN 101424777B CN 200810162236X A CN200810162236X A CN 200810162236XA CN 200810162236 A CN200810162236 A CN 200810162236A CN 101424777 B CN101424777 B CN 101424777B
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Abstract
The invention relates to a compact optical system of a miniature projector, which is composed of a projection lens, wherein the light emitting direction of the projection lens is provided with a projection screen; the projection lens is composed of a field lens group, a fixing lens group and a focus lens group; the field lens group, the fixing lens group and the focus lens group are orderly arranged along the broadcasting direction of light rays; the field lens group approaches to a polarized light beam splitter; the light emitting direction of the focus lens group is provided with an aperture diaphragm; the lens of the focus lens group is a focus element; during the process of projection and focus, only the focus lens group moves, the field lens group and the fixing lens group keep a still state, and the focal length of the projection lens is changed. The compact optical system of a miniature projector uses minimum dimension as precondition by using an LED as a light source and using a single LCOS as an image screen, therefore, the evenness of light efficiency and images is reasonably balanced. Besides, the invention has low manufacture cost.
Description
Technical field
The invention belongs to minitype projection machine manufacturing technology field, particularly optical system.
Background technology
Minitype projection machine is as a kind of product of new ideas, can be built in the visual digital products such as mobile phone, notebook computer, multimedia player (as MP4, PMP, IPOD etc.), handheld game machine, DVD, camera, video camera, it has clear and expands the effect of picture immediately, becomes the cutting edge technology of electronic product development.
One of gordian technique of projector's microminiaturization is the microminiaturization of ray machine.Select from light source, have two kinds of approach can realize the ray machine microminiaturization: one is selected LD, its two selection LED.
The ray machine size that the high brightness characteristic decision of LD laser beam constitutes can be contracted to 1～5c.c, especially adopts the structure of LD+ bidimensional scanner.In theory, the ray machine size can be accomplished the lc.c volume, but this just in theory, and just technology remains at many obstacles at present, and also there is a big difference from commercialization for it.
Selecting LED is the most real as the light source of ray machine.Adopt LED to make the minitype projection machine of light source, must consider what device to make image screen with.Multiple choices are arranged at present, and as DLP, LCOS, TFT-LCD etc., the manufacturing process of LCOS device is close with the manufacturing technology of large scale integrated chip, and it can realize miniaturization easily, and its resolution is high and cost is low.Though its light efficiency is said than DLP and is at half from the principle, do not hinder it to become the preferred option of minitype projection machine image screen.In minitype projection machine, because the restriction of structure, cost, LCOS can only select the scheme of Dan Ping, and single screen LCOS divides two kinds, color filter LCOS and color sequential LCOS, the former red, green, blue tristimulus image, by the space distribution of optical filter to give realization.Therefore, LED is the white light source of the normal bright attitude of direct current.Obviously, its ray machine size can do lessly but light efficiency is low, and image color is restricted by the optical filter color characteristic of white light LEDs spectrum and LCOS.Color sequential LCOS switches by the sequential of red, green, blue three primary colours figure, obtains the color graphics drop shadow effect of single LCOS screen.Therefore, LED must be three primary colours, and presses LCOS chip for driving instruction sequencing and switch luminous.The advantage of color sequential LCOS screen is that light efficiency height, color are good, but optical system can be bigger than optical system complexity, the physical dimension of color filter LCOS.
Summary of the invention
The invention provides a kind of LED of employing and make the compact optical system of the minitype projection machine of image screen as light source, monolithic LCOS, this optical system is prerequisite with the smallest dimension, and light efficiency and image homogeneity are given reasonable balance, and low cost of manufacture.
The technical solution used in the present invention is: the compact optical system of minitype projection machine, comprise led light source, shaping light group, light-combining prism, the polarized beam splitting device, image screen, projecting lens and projection screen, in the emission light direction of LED shaping light group is installed, shaping light group is made up of lens, the emergent light direction of shaping light group is installed light-combining prism, the emergent light direction of light-combining prism is installed the polarized beam splitting device, the opposite side of the polarized beam splitting device relative with light-combining prism is installed image screen, the emergent light direction of polarized beam splitting device is installed projecting lens, the emergent light direction of projecting lens is installed projection screen, projecting lens is by the field lens lens set, the fixing len group, the focusing lens set constitutes, along the light ray propagation direction, be the field lens lens set successively, the fixing len group, the focusing lens set, the field lens lens set is close to the exit facet of polarized beam splitting device, the emergent light direction of focusing lens set is installed aperture diaphragm, focusing lens set eyeglass is the focusing element, in the projected focus process, only move the focusing lens set, field lens lens set and fixing len group keep stationary state, and the focal length of projecting lens changes immediately.
Projection objective is made up of four four groups of structures, and these four eyeglasses are divided into three groups, and wherein the fixing len group contains two eyeglasses, field lens lens set and each a slice of focusing lens set; In addition, also comprise a light hurdle face, then form the 4th group.The field lens lens set is the positive light coke single element lens, be close to or be glued on the output plane of polarising beam splitter PBS, the fixing len group is respectively the lens of positive negative power, and the focusing lens set is monolithic positive light coke lens, the adjacent aperture diaphragm of emergent light direction of focusing lens set.
Described compact optical system, led light source adopts three primary-color LED pipes, and light-combining prism adopts X type light-combining prism, and polarising beam splitter adopts PBS, image screen adopts color sequential LCOS, and X type light-combining prism and color sequential LCOS are close to the both sides of polarising beam splitter PBS.
Described compact optical system, led light source adopt the three-primary color LED complex pipe to substitute the primary-color LED pipe.
Described compact optical system, field lens lens set and polarising beam splitter PBS adopt the injection moulding mold pressing integrally formed.
Described compact optical system adopts the X type to close the light glass sheet or the L type closes the alternative X type light-combining prism of photosystem.
Described compact optical system, field lens lens set, fixing len group, focusing lens set adopt full glass mirror, all-plastic eyeglass or glass mirror and glass lens to mix.
The compact optical system of minitype projection machine, comprise led light source, shaping light group, the polarized beam splitting device, image screen, projecting lens and projection screen, in the emission light direction of LED shaping light group is installed, shaping light group is made up of lens, the emergent light direction of shaping light group is installed the polarized beam splitting device, one side of polarized beam splitting device is installed image screen, the emergent light direction of polarized beam splitting device is installed projecting lens, the emergent light direction of projecting lens is installed projection screen, projecting lens is by the field lens lens set, the fixing len group, the focusing lens set constitutes, along the light ray propagation direction, be the field lens lens set successively, the fixing len group, the focusing lens set, the field lens lens set is close to the exit facet of polarized beam splitting device, and the emergent light direction of focusing lens set is installed aperture diaphragm, and focusing lens set eyeglass is the focusing element, in the projected focus process, only move the focusing lens set, field lens lens set and fixing len group keep stationary state, and the focal length of projecting lens changes immediately; Image screen adopts color filter LCOS, and led light source adopts the white light LEDs pipe.
The compact optical system of minitype projection machine, comprise led light source, shaping light group, the polarized beam splitting device, image screen, projecting lens and projection screen, in the emission light direction of LED shaping light group is installed, shaping light group is made up of lens, the emergent light direction of shaping light group is installed the polarized beam splitting device, one side of polarized beam splitting device is installed image screen, the emergent light direction of polarized beam splitting device is installed projecting lens, the emergent light direction of projecting lens is installed projection screen, projecting lens is by the field lens lens set, the fixing len group, the focusing lens set constitutes, along the light ray propagation direction, be the field lens lens set successively, the fixing len group, the focusing lens set, the field lens lens set is close to the exit facet of polarized beam splitting device, and the emergent light direction of focusing lens set is installed aperture diaphragm, and focusing lens set eyeglass is the focusing element, in the projected focus process, only move the focusing lens set, field lens lens set and fixing len group keep stationary state, and the focal length of projecting lens changes immediately; Mixed light rib body is installed between led light source and shaping light group.
Annotate: LCOS is Liquid Crystal On Silicon, it is liquid crystal over silicon, each pixel of color color filter LCOS is made up of the pixel elements of 3 different colours, and each pixel of sequential LCOS has only a pixel elements, by the various colored demonstrations of the high speed conversion realization of light source colour.
PBS is Polarizing Beam Splitter, i.e. polarization splitting prism.
The three-primary color LED pipe is that RGB is encapsulated into respectively in the LEDs.
The LED complex pipe is that red, green and blue LED is encapsulated in the LEDs together.
Projecting lens greater or less than four eyeglasses still kept the case frame structure formed by field lens lens set, fixing len group and focusing lens set.Under situation about need not focus, constitute fixing group jointly by fixing len group and focusing lens set.
The present invention reduces the size of projecting lens as far as possible, avoids projecting lens and abuts against LED, shaping light group and LCOS around the PBS and cause interference on the space.Projecting lens is made up of field lens lens set, fixing len group and three parts of focusing lens set, the effect of field lens lens set is the non-axle of LCOS reflection to be gone up heart divergent beams far away assemble to axis direction, and this will reduce the size of fixing len group, focusing lens set effectively.The major function of fixing len group, focusing lens set is the imaging requirements that reaches projecting lens, realizes requirements such as magnification, numerical aperture, picture quality.Because LED, shaping light group and LCOS are close to PBS, so that there is not the arrangement space whole focus adjusting mechanism that moves of projecting lens of sening as an envoy to.Therefore, as the focusing element, and field lens lens set, fixing len group keep static in the focusing process with the focusing lens set of diameter minimum in the present invention.For this reason, at first the aperture diaphragm of projecting lens to be placed on the focusing lens set near, and all optical parametrics of projecting lens are carried out balance with the ZOOM design, obtain desirable design result, make LED pipe, shaping light group, X type light-combining prism, LCOS and projecting lens be centered around closely around the PBS, whole projection optical system is very compact.
The optical system of the little projection ray machine of the present invention adopts LED as light source, it is a point of penetration from the required tight Minato optical system of color sequential LCOS, also can benefit other image screen, as color filter LCOS, DLP etc., have compact and rational structure, good light collecting light ability and the advantages such as projection imaging quality of high-quality, can realize the light efficiency of 5～7c.c ray machine size, every watt of 8lm, reach the technical requirement of built-in ray machine substantially.Certainly, along with the LED development of technology, the ray machine volume of use the technology of the present invention can be done forr a short time, light efficiency is higher.
The present invention be applicable to the optical system of the built-in projector in the digital visual product, but perhaps standalone configuration becomes multipurpose miniature projector for the compact optical system that minitype projection machine uses.
Description of drawings
Fig. 1 is the structural representation of embodiment one.
Fig. 2 is the shape assumption diagram of embodiment one.
Fig. 3 is the structural representation of embodiment two.
Fig. 4 is the structural representation of embodiment three.
Fig. 5 is the structural representation of embodiment four.
Fig. 6 is the structural representation of embodiment five.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
Embodiment one: with color sequential LCOS is example, shown in Fig. 1-2: by red, green, blue three LED1,2,3 and corresponding three groups of shaping lens 4,5,6 form the three primary colours illuminator, three LED are isosceles triangle and lay, in three LED1,2,3 emission light direction is installed shaping light group 4,5,6, shaping light group 4,5,6 emergent light direction is installed X type light-combining prism 7, the emergent light direction of X type light-combining prism 7 is installed polarized beam splitting device PBS8, the opposite side of the polarized beam splitting device PBS8 relative with X type light-combining prism 7 is installed color sequential LCOS9, the emergent light direction of polarized beam splitting device PBS8 is installed projecting lens 10, and the emergent light direction of projecting lens 10 is installed projection screen 11.Red LED1, green LED2, blue LED3 have the identical light-emitting area and the angle of divergence, and then shaping light group 4,5,6 specifications are identical, and every group of shaping light group is made up of two lens, form the colimated light system of large-numerical aperture.The function of shaping light group is that the beam shaping with the radiation of LED wide angle is the approximate construction collimated optical beam, and the ratio of the luminous yardstick of LED and the focal length of shaping light group has formed the field angle of shaping light group, and this field angle has been determined the numerical aperture of projecting lens.Red by after the shaping, green, blue beam is respectively from shaping light group 4,5,6 outgoing, the three primary colours light beam is merged into a branch of light through X type light-combining prism 7, enter PBS8, this light beam is polarized beam splitter PBS8 and detects the useful polarized light component of color sequential LCOS9, after be incident on the photosurface of color sequential LCOS9, this photosurface gives phase delay and reflection with intercepting in the circular light spot of projection with photosurface homalographic rectangle Guang Ban And, incide once more on the beam-splitting surface of PBS8, PBS8 therefrom detects the component of crossed polarized light, by projecting lens 10 with the phase delay figure of LCOS9 with red, green, the mode of blue sequential is thrown on projection screen, because it is red that sequential replaces, green, the blue images frequency is higher than the vision frequency, thereby forms colour projection's picture.For fear of LCOS9 and shaping light group 4 and LED1 conflicting structurally, LCOS9 is placed on the side of PBS8, settles with X type light-combining prism 7 opposite sides.
The present invention is decided to be the fixing len group with 102, and 103 are decided to be the focusing lens set, and with aperture diaphragm 104 be placed in 103 near, reduce the size of focusing lens set 103 as far as possible, vacating space is settled the focusing structure of focusing lens set 103.Like this, projecting lens 10 is telecentric imaging systems.During design, not only satisfy the requirement of imaging index, and will satisfy fixing len group 102, the dimensional requirement that structurally allows of focusing lens set 103, will consider image quality problem under the different focus distance condition simultaneously.In minitype projection machine, often need in wide drop shadow spread, reach the requirement of picture rich in detail, this scope is set in 0.25～3 meter usually.When stating projecting lens in design, but with fixing len group 102, the interval d3 of focusing between the lens set 103 as parameter, with the method change d3 of ZOOM design, with the different focusing of correspondence from.Should abandon the conforming requirement of focusing this moment, promptly under different projector distances, allows the focal length of projecting lens 10 that small variation is arranged.
As seen from Figure 1, X type light-combining prism 7 is close to PBS8, and LCOS9 and X type light-combining prism 7 relatively are close to the both sides of PBS8, avoids the overall dimensions of LCOS9 and LED1, shaping lens 4 interferences, has reduced size.Like this, the space of leaving projecting lens for can only be confined in the gap between LED3, shaping lens 6 and the LCOS9, and the width in this gap is substantially equal to the width of PBS8.But from the heart divergent beams far away that PBS8 penetrates, in case outgoing PBS8 output face, if there is not the restriction of other optical system, its width of light beam will be greater than the width of PBS8.
Below illustrate: the LED light-emitting area is 1 * 1mm2, effectively lighting angle is ± 60 °, LCOS is 0.42 " color sequential LCOS; resolution is 640 * 480, and photosensitive area is H * L=6.4 * 8.5mm 2, according to luminous energy law of conservation ul=u ' l '; l=0.5 wherein; u=1.046, l '=3.2, so u '=0.164.The NA=0.16 of projecting lens is equivalent to f '/D=3.
Projecting lens 10 structural parameters that adopt are as shown in table 1:
Table 1
| Explanation | R | d | Logical light radius | Material |
| Light hurdle face | ∞ | 0 | 2.75 |
| Explanation | R | d | Logical light radius | Material |
| |
7.5 180 | 2 | 2.95 | SK18A |
| Fixing len group 102 | -7.2 10 -33.6 -7.76 | 4.16-4.5 0.92 0.91 1.91 | 3.1 3.55 3.54 4.02 | SF5 SK18A |
| Field lens lens set 101 | 10.34 | 2.25 | 6.49 | SK18A |
| ∞ | 2.79 | 6.44 | ||
| PBS | ∞ | 10 | 5.47 | SF57 |
| LCOS | ∞ | 1.43 | 5.24 |
Annotate: the glass trade mark is the SCHOTT trade mark
In focusing, when the projection distance is 3 meters, the d3=4.16 in the table 1, the synthetic focal length of whole group projecting lens is 16.53, when the projection distance was 0.3 meter, d3=4.5, synthetic focal length were 16.78.As seen, when focusing, synthetic focal length has small variation, and variable quantity only is 1.5%.In 0.3～3 meter focusing range, MTF can both guarantee (42lpm) more than 30%, and distortion is less than 2%.Because focusing lens set 103 logical optical paths are φ=5.5, the PBS width is 10mm, so can design the focus adjusting mechanism of focusing lens set 103 easily in the width of 10mm.
Embodiment two: as shown in Figure 3, present embodiment adopts the X type to close the light mode, and different with embodiment one is, close gloss and close light glass sheet 7 with the X type, every is closed the light glass sheet different dichroic coatings is all arranged, and the light of three primary colours enters and is combined into a branch of light after the X type closes mating plate 7, enters PBS8.Other content of present embodiment is identical with embodiment one.
Embodiment three: as shown in Figure 4,1,2,3 is led light source, and 4,5,6 are shaping light group, and present embodiment adopts the L type to close the light mode, and the structure of projecting lens 10 can effectively reduce the size of ray machine.The X type closes the X type light-combining prism of light glass sheet 7 alternate embodiments one.In the present embodiment, close photosystem and can be applicable to the more requirement of large-numerical aperture.In addition, the PBS in employing sheet type PBS (as the WGP) alternate embodiment one.Arrow represents that focusing is mobile among the figure.
Embodiment four: Fig. 5 has represented the situation that projecting lens 10 of the present invention adopts among the color filter LCOS.
Among Fig. 5,1 is white light LEDs, and 2 are shaping light group, and 3 is color filter LCOS, and 4 is PBS.Compare with embodiment one, present embodiment has saved the structure of light-combining prism.
Owing to adopt projecting lens 10, the clear aperature of its field lens lens set 101, fixing len group 102, focusing lens set 103 all is less than or equal to the size of PBS 4.Therefore, can reduce the thickness of ray machine effectively.Arrow represents that focusing is mobile among the figure.
Embodiment five: Fig. 6 has represented that employing color sequential LCOS makes image screen, and make light source with the three-primary color LED complex pipe, optical system is compared with embodiment one, saved between the structure of light-combining prism and LED complex pipe and the shaping light group and added mixed light rib body 5, make three primary colours be mixed into white light, reach the uniform purpose of color.
Embodiment six: when requiring to have more large-numerical aperture, the structure of projecting lens 10 adopts and surpasses 44 groups simple form, but these lens have the framed structure of field lens lens set 101, fixing len group 102, focusing lens set 103 will remain unchanged, what become only is the inside composition form of fixing len group 102, focusing lens set 103, and its composition form can be changed into and has aspheric lens combination or become spherical lens group more than 3.
Embodiment seven: image screen adopts color filter LCOS replacement color sequential LCOS, and led light source adopts the white light LEDs pipe to substitute the primary-color LED pipe.Other content of present embodiment is identical with embodiment four.
In addition, material (glass or plastics) that projecting lens of the present invention is selected and face type (sphere or aspheric surface), by deciding of control manufacturing cost, can adopt full glass mirror mode or all-plastic eyeglass mode, or adopt glass mirror and glass lens mixed form.
Claims (8)
1. the compact optical system of minitype projection machine, comprise led light source, shaping light group, light-combining prism, the polarized beam splitting device, image screen, projecting lens and projection screen, in the emission light direction of LED shaping light group is installed, shaping light group is made up of lens, the emergent light direction of shaping light group is installed light-combining prism, the emergent light direction of light-combining prism is installed the polarized beam splitting device, the opposite side of the polarized beam splitting device relative with light-combining prism is installed image screen, the emergent light direction of polarized beam splitting device is installed projecting lens, the emergent light direction of projecting lens is installed projection screen, it is characterized in that: described projecting lens is by the field lens lens set, the fixing len group, the focusing lens set constitutes, along the light ray propagation direction, be the field lens lens set successively, the fixing len group, the focusing lens set, the field lens lens set is close to the exit facet of polarized beam splitting device, the emergent light direction of focusing lens set is installed aperture diaphragm, focusing lens set eyeglass is the focusing element, in the projected focus process, only move the focusing lens set, field lens lens set and fixing len group keep stationary state, and the focal length of projecting lens changes immediately.
2. compact optical system according to claim 1, it is characterized in that: led light source adopts three primary-color LED pipes, light-combining prism adopts X type light-combining prism, polarising beam splitter adopts PBS, image screen adopts color sequential LCOS, and X type light-combining prism and color sequential LCOS are close to the both sides of polarising beam splitter PBS.
3. compact optical system according to claim 2 is characterized in that: led light source adopts the three-primary color LED complex pipe to substitute the primary-color LED pipe.
4. compact optical system according to claim 2 is characterized in that: field lens lens set and polarising beam splitter PBS adopt the injection moulding mold pressing integrally formed.
5. compact optical system according to claim 2 is characterized in that: employing X type closes the light glass sheet or the L type closes the alternative X type light-combining prism of photosystem.
6. compact optical system according to claim 1 is characterized in that: field lens lens set, fixing len group, focusing lens set adopt full glass mirror, all-plastic eyeglass or glass mirror and glass lens to mix.
7. the compact optical system of minitype projection machine, comprise led light source, shaping light group, the polarized beam splitting device, image screen, projecting lens and projection screen, in the emission light direction of LED shaping light group is installed, shaping light group is made up of lens, the emergent light direction of shaping light group is installed the polarized beam splitting device, one side of polarized beam splitting device is installed image screen, the emergent light direction of polarized beam splitting device is installed projecting lens, the emergent light direction of projecting lens is installed projection screen, it is characterized in that: described projecting lens is by the field lens lens set, the fixing len group, the focusing lens set constitutes, along the light ray propagation direction, be the field lens lens set successively, the fixing len group, the focusing lens set, the field lens lens set is close to the exit facet of polarized beam splitting device, and the emergent light direction of focusing lens set is installed aperture diaphragm, and focusing lens set eyeglass is the focusing element, in the projected focus process, only move the focusing lens set, field lens lens set and fixing len group keep stationary state, and the focal length of projecting lens changes immediately; Image screen adopts color filter LCOS, and led light source adopts the white light LEDs pipe.
8. the compact optical system of minitype projection machine, comprise led light source, shaping light group, the polarized beam splitting device, image screen, projecting lens and projection screen, in the emission light direction of LED shaping light group is installed, shaping light group is made up of lens, the emergent light direction of shaping light group is installed the polarized beam splitting device, one side of polarized beam splitting device is installed image screen, the emergent light direction of polarized beam splitting device is installed projecting lens, the emergent light direction of projecting lens is installed projection screen, it is characterized in that: described projecting lens is by the field lens lens set, the fixing len group, the focusing lens set constitutes, along the light ray propagation direction, be the field lens lens set successively, the fixing len group, the focusing lens set, the field lens lens set is close to the exit facet of polarized beam splitting device, and the emergent light direction of focusing lens set is installed aperture diaphragm, and focusing lens set eyeglass is the focusing element, in the projected focus process, only move the focusing lens set, field lens lens set and fixing len group keep stationary state, and the focal length of projecting lens changes immediately; Mixed light rib body is installed between led light source and shaping light group.
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| CN200810162236XA CN101424777B (en) | 2008-11-27 | 2008-11-27 | Compact optical system of mini projector |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922681B (en) * | 2009-06-11 | 2012-08-22 | 青岛海泰新光科技有限公司 | Light combining system of LED three-color light |
| CN102036042B (en) * | 2009-09-28 | 2013-06-19 | 南阳首控光电有限公司 | Laser television |
| CN102004321A (en) * | 2010-08-27 | 2011-04-06 | 浙江金成科技发展有限公司 | Optical structure of LED liquid crystal projector with single polarization converter |
| CN102063001A (en) * | 2010-11-19 | 2011-05-18 | 封燕鸣 | Solid light source single-system time-division color projector and projecting method |
| CN102081289A (en) * | 2010-12-09 | 2011-06-01 | 杭州晶景光电有限公司 | Color gamut extending compact type micro light engine based on CF-LCoS (color filter liquid crystal on silicon) |
| KR20150030748A (en) * | 2012-07-12 | 2015-03-20 | 일렉트로 싸이언티픽 인더스트리이즈 인코포레이티드 | Interactive control system, methods of making the same, and devices incorporating the same |
| CN103268055A (en) * | 2013-06-07 | 2013-08-28 | 苏州百纳思光学科技有限公司 | Multi-band-pass optical filtering 3D (three-dimensional) projector |
| CN105022209A (en) * | 2014-04-16 | 2015-11-04 | 信泰光学(深圳)有限公司 | Micro-projector |
| CN107085348A (en) * | 2017-06-27 | 2017-08-22 | 深圳市点睛创视技术有限公司 | A kind of Portable projector and its colimated light system |
| CN110910757A (en) * | 2019-12-06 | 2020-03-24 | 江苏盐西新城教育产业项目开发有限公司 | Structure of focusing of eyeshield curved surface display screen |
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