CN100476579C - Back-projection screen with multilayer microlens structure and manufacturing method - Google Patents
Back-projection screen with multilayer microlens structure and manufacturing method Download PDFInfo
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- CN100476579C CN100476579C CNB2004100961043A CN200410096104A CN100476579C CN 100476579 C CN100476579 C CN 100476579C CN B2004100961043 A CNB2004100961043 A CN B2004100961043A CN 200410096104 A CN200410096104 A CN 200410096104A CN 100476579 C CN100476579 C CN 100476579C
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- projection screen
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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
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
Abstract
This invention discloses a projection screen with multi-layer lens, which is composed of multiple overlapped micro lens layers, wherein, the two reflection surfaces of each micro lens are separately high reflection rate substance and low reflection rate substance. This invention also discloses the process method of this projection screen.
Description
Technical field
The present invention relates to the television imaging technology, is a kind of rear projection screen technology specifically, has related to this kind screen construction and manufacture method,
Background technology
Rear projection screen is the critical component of rear-projection TV, as shown in Figure 1, its major function be when from the light of internal system projection lens 1 after imaging on the screen 2, the light of each picture point (pixel) can both be opened with the scattered through angles of maximum toward spectators' direction, thereby make the light of each picture point can both enter spectators' eyeball, spectators just can watch the image of whole screen.Be understandable that, if rear projection screen does not possess this scattering power, that is to say that the light of each picture point is still by incident light direction ejaculation separately, these light just are difficult to enter spectators' eyeball simultaneously, and spectators can't see whole image so.This scattering power of screen is generally expressed by horizontal view angle and vertical angle of view.Screen scattering angle is in the horizontal direction represented in the horizontal view angle, the scattering angle that on behalf of screen, the vertical angle of view obtain in vertical direction.As shown in Figure 2, the maximal value of level and vertical angle of view is 180 degree.The parts that surpass 180 degree are actually the reflection to light, and spectators also can't see.
In addition, screen material can reflect and absorb certain light.Reflection and absorption all can cause loss to light, thereby cause the actual transmittance of screen to reduce, and the degree of this loss is expressed with gain usually.The big more screen that gains is more little to the loss of light, and the screen transmittance is high more, and picture is also bright more.In addition, contrast and sharpness also are the important parameters of screen.
In addition, what be worth emphasizing is that people tend to ignore this notion of visual angle uniformity coefficient when estimating screen quality.What so-called visual angle uniformity coefficient reflected is the homogeneity of screen scattered light brightness on each view directions.In fact, screen scattering power in different directions is different, and this just causes the light intensity on the different directions different, thus the screen intensity difference that spectators are seen in different directions.Usually we call main force's scattering direction to the largest light intensity direction.The visual angle uniformity coefficient can be with the percentage of minimum intensity of light and largest light intensity quantitative Analysis recently.Usually, common CRT (Crystal Ray Tube, cathode-ray tube (CRT)) TV (mainly referring to below 29 cun here) can reach the visual angle uniformity coefficient more than 80%, and spectators watch from all angles can feel that all the brightness of screen is close substantially.For rear-projection TV, because the restriction of screen but is difficult to reach this level.This mainly is owing to following reason:
At present, rear projection screen mainly is divided into the rear projection screen (being called for short microstructured screen or optics curtain) and microscopic particle diffuse transmission type rear projection screen (being called for short the scattering curtain) the two big classes of band microcosmic optical texture according to inner structure.
As shown in Figure 3: for most of scattering curtains 2, main force's scattering direction and this position are consistent often from the incident direction of the light that projection lens 1 sends.Other scattering direction for this position, it is low more to depart from main force's scattering direction light intensity more, when you watch screen from different perspectives, the direction of visual lines of the eyes just in time main force's scattered beam direction with immediate area is consistent, therefore be brighter all the time from the nearer zone of eyes, and zone far away is darker, so-called solar effect that Here it is or title speck effect.Though the scattering curtain that replaces the scattering particulate to make with high-index materials such as glass microballoons can make solar effect alleviate to some extent, but still can not fundamentally eliminate this phenomenon.
Because scattering curtain appreciation effect is inferior, so gradually from market exit, the substitute is the optical screen of microstructure.As shown in Figure 4, microstructured screen increases a Fresnel Lenses or screw thread mirror 3 by the front at scattering layer 2, the incident direction of light before entering scattering layer 2 that makes projection lens 1 send all is adjusted into vertical with screen by Fresnel Lenses or screw thread mirror 3, like this, pass each regional main force's scattered beam direction behind the scattering layer 2 remain vertical with screen, when spectators can obtain the highest brightness effects over against screen (sight line is vertical with screen) when viewing and admiring.And when spectators changed the visual angle and watch from the side, the light intensity of the scattered beam that each is regional all descended synchronously, though decline scope slightly different (zone that remains far away descends more), this species diversity can be controlled in the small range.Though so the screen overall brightness has descended, solar effect can be avoided substantially, therefore microstructured screen is also accepted extensively by market.The scattering layer 2 of the microstructured screen that is used with lens 3 is varied, the lenticule of the employing that has shown in Fig. 5 a, the glass microballoon of the employing that also has shown in Fig. 5 b etc.Wherein, the shape of lenticule 3 also is varied, only illustrates wherein a kind of among Fig. 5.In addition, because large-sized Fresnel Lenses or screw thread mirror need quite expensive mould and have higher processing cost,, rear-projection TV universal caused negative effect so cause the microstructured screen price high for a long time.The producer that has uses tapered waveguide or tapered lens to make scattering layer for reducing cost, and saves preposition elements such as Fresnel Lenses.Such screen since around the bigger zone of incident angle, light is repeatedly reflection in waveguide or lens, light loss is bigger, caused screen relatively dimer at four angle glazed threads, have a strong impact on image quality, though cost has reduced, but be cost, so also be difficult to popularize with the image quality of sacrificing screen.
Can recognize from preamble,, but still can not provide good visual angle uniformity coefficient though the optical microstructures screen that uses has been avoided the problem of solar effect at present.As spectators during with view screen with great visual angle, because the visual angle uniformity coefficient of screen is relatively poor, screen intensity will wholely obviously descend.From this respect, the appreciation effect of rear-projection TV still can not match in excellence or beauty with common CRT TV.Can reach 180 degree visual angles though there is producer to propagate its rear-projection TV, actual when you view and admire with great visual angle, 1/2nd of the too late front face brightness of its brightness, have in addition less than 1/3rd.So the whole picture effect of present rear projection screen still is not very desirable.
Summary of the invention
The present invention just at existing rear projection screen in above shortcomings aspect the uniformity coefficient of visual angle, a kind of rear projection screen of multilayer microlens structure is provided, this rear projection screen can not only be eliminated solar effect, and can obtain higher visual angle uniformity coefficient, make rear-projection TV reach the brightness appreciation effect identical with CRT.
Second purpose of the present invention also is also to provide a kind of manufacture method of rear projection screen of multilayer microlens structure, and this method makes the cheap of this rear projection screen, is the universal good condition of having created of rear-projection TV.
In order to realize first purpose of the present invention, the technical solution used in the present invention is:
A kind of rear projection screen of multilayer microlens structure, rear projection screen is constituted by the formed microlens layer of the lenticule by a plurality of various natural shapes that is superimposed by multilayer, and every layer of lenticular two plane of refraction both sides are high index of refraction material and low-refraction material respectively.
Lens among the present invention are meant the lens of broad sense promptly to have two faces, and utilize these two transparent substances that reflect in the face of light.
Described lenticular two planes of refraction can be a curved surface and a planar combination, or the combination of two curved surfaces, and for the present invention, curved surface plays the effect to light scattering.
Described high index of refraction material is meant the close material of light, for example glass, resin etc.; And the low-refraction material is meant the lower material of refractive index with respect to the high index of refraction material, and promptly light is dredged material, for example can be air or other light medium.
The present invention adopts the multilayer microlens overlaying structure.Each plane of refraction both sides of lenticule are high index of refraction material and low-refraction material respectively, to guarantee each layer higher scattering power are arranged all.The refringence of high index of refraction material and low-refraction material is apart from big more, and scattering power is strong more.When each microlens layer of light penetration, the light intensity of main force's scattering direction is repeatedly weakened, and the light intensity of other direction successively adds up, and finally reaches the light intensity that is close with main force scattering direction, thereby can obtain very high visual angle uniformity coefficient.So owing to adopt such layering scattering mechanism, no matter incident direction how, the visual angle uniformity coefficient that is obtained is all very high, therefore Fresnel mirror or screw thread mirror need be set in its front.And each lens jacket can use same mould manufacturing, so manufacturing cost will descend significantly.Owing to guaranteed the visual angle uniformity coefficient, so also Lock-out of solar effect has obtained better picture overall quality.
In rear projection screen, also can increase one deck light-absorption layer among the present invention, to absorb reflected ambient, enhancing contrast ratio.
The present invention also provides the manufacture method of the rear projection screen of this kind multilayer microlens structure, adopt the material of high transmission rate and high index of refraction to do base material, substrate surface treatment is formed the lenticule of a plurality of various natural shapes with frosting technology, by tiling after the preliminary dimension cutting and piling up neat, press the suitable weight plates of one deck size, it is close to mutually discharges unnecessary air, cement mutually, seal with bonding agent around each lens jacket then.
Described base material preferred resin material, base material thickness is advisable with 0.1～0.2mm.
But the frosted of base material single face also can two-sided frosted form lens.
The manufacture method of this rear projection screen provided by the invention adopts the frosting technology of existing maturation to prepare microlens layer, with the air is the low-refraction material, and around adhering and sealing, have simple for production, material cost and the low advantage of processing cost, can significantly reduce the cost of the rear projection screen of this multilayer microlens structure, for condition has been created in the popularization of this rear projection screen.This rear projection screen provided by the invention can not only be eliminated solar effect, and can obtain higher visual angle uniformity coefficient, makes rear-projection TV reach the brightness appreciation effect identical with CRT, and its comprehensive image quality is higher than existing rear projection screen.
Description of drawings
Fig. 1 is the rear projection screen optical schematic diagram;
Fig. 2 is the visual angle figure of rear projection screen;
Fig. 3 is the solar effect schematic diagram of rear projection screen;
Fig. 4 is a Microstructure Optics screen schematic diagram in the prior art;
The structural drawing of the existing Microstructure Optics screen of Fig. 5;
Fig. 6 is the structural representation of the rear projection screen of multilayer microlens structure of the present invention;
Fig. 7 is the optical schematic diagram of the rear projection screen of multilayer microlens structure of the present invention;
Fig. 8-Figure 14 is the structural representation of the rear projection screen of multilayer microlens structure of the present invention.
Among the figure, come the size of this direction light intensity of approximate representation with the length of arrow.
Embodiment
Be described further below in conjunction with the rear projection screen of the drawings and specific embodiments multilayer microlens structure of the present invention.
As shown in Figure 6, the rear projection screen of multilayer microlens structure of the present invention, be the microlens layer that forms by two-layer above lenticule 4 stacks, two plane of refraction both sides of every layer of lenticule 4 are high index of refraction material 41 and low-refraction material 5 respectively, the high index of refraction material is meant the close material of light, for example glass, resin etc.; And the low-refraction material is meant the lower material of refractive index with respect to the high index of refraction material, and promptly light is dredged material, for example is air or other low-refraction light medium, and when being air, its material cost, cost of manufacture are lower.
Light enters the low-refraction material and all can produce refraction when the low-refraction material is injected the high index of refraction material from the high index of refraction material, every layer of lens all can produce stronger scattering power like this, and the refractive index difference of the material of plane of refraction both sides is big more, and the scattering power of lens is strong more.As shown in Figure 7, light beam is actual and inequality at the scattering point of each layer, if this spacing is bigger, on spectators' angle, may think that it is different picture point, and this will reduce the resolution of picture.The distance of this scattering point is relevant with every layer of lens thickness, also with regard to the time say relevantly with the gross thickness of whole screen, screen thickness is big more, big more in the distance of the scattering point of screen sides, the screen resolution of screen is low more.As long as screen is enough thin, the difference of each scattering point position just can little degree to the picture point that is lower than screen self size, thereby thinking visually that those scattered beams are still from same picture point sends, and can not exert an influence to resolution at this moment.Since the scattered beam of each layer scattering point is regarded as coming from same picture point, the light intensity of this picture point on all non-main force scattering directions just is equivalent to corresponding each layer scattering point light sum, and the light intensity of main force's scattering direction of last one deck is represented the light intensity of this picture point on this direction, so after each layer scattering, the light intensity of the main force scattering direction identical with the incident light direction is repeatedly weakened, and the light intensity of other direction strengthens because of the light intensity of each layer scattered light successively adds up, may ultimately reach the light intensity that is close with main force scattering direction, thereby obtain very high visual angle uniformity coefficient.
Be understandable that lenticule scattering number of times is many more, the visual angle uniformity coefficient is just good more, but therefore the brightness meeting descends.Therefore between should be weighed selection.Generally, whole microlens layer should contain the curved surface more than 3 altogether at least.Have 4 layers and can obtain visual angle uniformity coefficient more than 80% with top-surface camber.Lenticule should be selected the high transmission rate material, to reduce the luminance loss.The material of high transmission rate such as optical plastic, transmittance generally can reach more than 90%, and this material has higher refractive index.
According to aforementioned, for guaranteeing high definition, microlens layer is got over Bao Yuehao, stacks closely, and whole screen gross thickness is the best to be no more than 1mm.Corresponding lenticular diameter can be arranged between 0.02～0.15mm.
According to principle of the present invention as can be known, lens jacket can adopt two-sided microlens layer (or biconvex lens layer as shown in Figure 8, be the lens jacket that the two sides is convex surface), with single face microlens layer (or plano-convex lens layer shown in Figure 6, promptly one side simultaneously is the lens jacket of convex surface for the plane) compare, reduce unnecessary plane of refraction, thereby can under the identical situation of visual angle uniformity coefficient, obtain higher transmittance and contrast.Certainly, also can select the form of single two-sided (not shown) that combines for use.
Shown in Fig. 9 a, each layer lens can not need mutual correspondence.And shown in Fig. 9 b, the mode of stacking of plano-convex lens layer can freely be selected, and as changing the plane into to the plane, convex surface is placed convex surface.
The shape of lens can be varied.Both can be Fig. 8, convex mirror shown in Figure 9, also can be as shown in figure 10, high index of refraction 41 parts between the low-refraction material layer 5 are concave mirror, or are Figure 13, shown in Figure 14 irregularly shaped.From the front, lenticule both can be a rectangle as shown in figure 11, also can be circle, ellipse, polygon, tapered etc. or other shape as shown in figure 12.
Because each plane of refraction has certain reflection to ambient light, and the number of plies is many more, reflects manyly more, can reduce the contrast of screen like this.Can increase one deck light-absorption layer, absorb reflected ambient, increase contrast.Extinction material can be pigment, dyestuff, carbon black etc., and these all are the light absorbents that present rear projection screen generally uses.Also can directly these materials directly be added in the lens jacket in right amount.Also or with extinction material add in the protection screen.So-called protection screen is to be arranged on the rear projection screen outermost layer usually, plays the protective seam of dustproof, anti-greasy dirt or anti-scratch effect, and about 4mm is thick, is generally resin material.
Embodiment 2
Present embodiment be with resin material as the high index of refraction material, be the low-refraction material with the air, a kind of manufacture method of rear projection screen of multilayer microlens structure is provided:
Adopt the resin material of high transmission rate and high index of refraction to do base material, thickness is advisable with 0.1～0.2mm, adopt ripe at present frosting technology that resin surface is handled after, make resin surface form lens as Figure 13 or various natural shapes shown in Figure 14.Can single face frosted as Figure 13, also can two-sided as shown in figure 14 frosted.Like this, microlens layer has just been made.The multilayer microlens layer by tiling after the preliminary dimension cutting and piling up neatly, is pressed the suitable weight plates of one deck size, it is close to mutually discharges unnecessary air.Cement mutually, seal with bonding agent and so on around each lens jacket then.Can guarantee to still have between the lens jacket an amount of air to serve as light like this and dredge material, can prevent again that unnecessary air from entering and cause lens jacket distortion, spacing increase etc. between the lens jacket.Like this, even if a kind of ultra-thin multilayer microlens screen carried out.
More than operation is all carried out at normal temperatures and pressures, need not mould, and frosting technology is simple, is that production cost is unprecedentedly cheap for rear projection screen.
Claims (10)
1, a kind of rear projection screen of multilayer microlens structure, it is characterized in that: rear projection screen is constituted by the formed microlens layer of the lenticule by a plurality of various natural shapes that is superimposed by multilayer, and every layer of lenticular two plane of refraction both sides are high index of refraction material and low-refraction material respectively.
2, the rear projection screen of multilayer microlens structure as claimed in claim 1 is characterized in that: described lenticular two planes of refraction are a curved surface and a planar combination, or the combination of two curved surfaces.
3, the rear projection screen of multilayer microlens structure as claimed in claim 1 or 2 is characterized in that: described high index of refraction material is glass or resin.
4, the rear projection screen of multilayer microlens structure as claimed in claim 1 or 2 is characterized in that: described low-refraction material is an air.
5, the rear projection screen of multilayer microlens structure as claimed in claim 1 or 2 is characterized in that: described microlens layer has the curved surface more than 4 layers.
6, the rear projection screen of multilayer microlens structure as claimed in claim 1 or 2 is characterized in that: the gross thickness of described microlens layer is no more than 1mm, and described lenticular diameter is 0.02～0.15mm.
7, the rear projection screen of multilayer microlens structure as claimed in claim 1 or 2 is characterized in that: also comprise one deck light-absorption layer.
8, a kind of manufacture method of rear projection screen of multilayer microlens structure, it is characterized in that: adopt the material of high transmission rate and high index of refraction to do base material, substrate surface is handled the lenticule that forms a plurality of various natural shapes with frosting technology, by tiling after the preliminary dimension cutting and piling up neat, press the suitable weight plates of one deck size, it is close to mutually discharges unnecessary air, cement mutually, seal with bonding agent and so on around each lens jacket then.
9, the manufacture method of the rear projection screen of multilayer microlens structure as claimed in claim 8 is characterized in that: described base material is a resin, and thickness is 0.1～0.2mm.
10, the manufacture method of the rear projection screen of multilayer microlens structure as claimed in claim 8 or 9 is characterized in that: described base material adopts single face frosted or two-sided frosted to form lens.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100961043A CN100476579C (en) | 2004-11-26 | 2004-11-26 | Back-projection screen with multilayer microlens structure and manufacturing method |
| PCT/CN2005/001511 WO2006056114A1 (en) | 2004-11-26 | 2005-09-20 | The rear projection screen of the multilayer microlenses structure and the manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100961043A CN100476579C (en) | 2004-11-26 | 2004-11-26 | Back-projection screen with multilayer microlens structure and manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1603942A CN1603942A (en) | 2005-04-06 |
| CN100476579C true CN100476579C (en) | 2009-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100961043A Expired - Fee Related CN100476579C (en) | 2004-11-26 | 2004-11-26 | Back-projection screen with multilayer microlens structure and manufacturing method |
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| Country | Link |
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| CN (1) | CN100476579C (en) |
| WO (1) | WO2006056114A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789010B (en) * | 2011-05-16 | 2016-09-07 | 中国科学院微电子研究所 | A kind of two-sided microlens array and manufacture method thereof |
| CN105243965A (en) * | 2015-10-27 | 2016-01-13 | 巨洋神州（苏州）数字技术有限公司 | Optical splicing display screen and installation method thereof |
| CN108663893B (en) * | 2017-03-29 | 2020-10-23 | 台湾扬昕股份有限公司 | Rear projection screen |
| CN108563094A (en) * | 2018-05-04 | 2018-09-21 | 广州艾恩电子有限公司 | A kind of projection screen |
| CN109188847A (en) * | 2018-11-05 | 2019-01-11 | 成都菲斯特科技有限公司 | Imaging arrangement, projection screen and optical projection system |
| CN109143765A (en) * | 2018-11-05 | 2019-01-04 | 成都菲斯特科技有限公司 | Imaging arrangement, projection screen and optical projection system |
| JP7231195B2 (en) * | 2018-11-30 | 2023-03-01 | 学校法人自治医科大学 | Resin lens, resin lens array, and method for manufacturing resin lens |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536056A (en) * | 1981-10-05 | 1985-08-20 | Hitachi, Ltd. | Rear projection apparatus |
| US5448401A (en) * | 1992-12-25 | 1995-09-05 | Sony Corporation | Screen of projection display |
| DE60034283T2 (en) * | 1999-08-26 | 2007-08-30 | KURARAY CO., LTD, Kurashiki | Method for producing a curved film for transmitted-light projection screens |
| KR100972017B1 (en) * | 2001-06-01 | 2010-08-02 | 도판 인사츠 가부시키가이샤 | Micro-lens sheet, backlight and display |
-
2004
- 2004-11-26 CN CNB2004100961043A patent/CN100476579C/en not_active Expired - Fee Related
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2005
- 2005-09-20 WO PCT/CN2005/001511 patent/WO2006056114A1/en active Application Filing
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| Publication number | Publication date |
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| CN1603942A (en) | 2005-04-06 |
| WO2006056114A1 (en) | 2006-06-01 |
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Effective date of registration: 20090313 Address after: Sichuan province Chengdu City West Qin Fuqin No. 171 Building 5 building A501 room Patentee after: Chengdu Ren Digital Electronics Co., Ltd. Address before: Sichuan province Chengdu City West Qin Li Chang No. 171 Building 5 floor Patentee before: Luo Xiaoling |
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