CN100476579C - Back-projection screen with multilayer microlens structure and manufacturing method - Google Patents

Back-projection screen with multilayer microlens structure and manufacturing method Download PDF

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CN100476579C
CN100476579C CN 200410096104 CN200410096104A CN100476579C CN 100476579 C CN100476579 C CN 100476579C CN 200410096104 CN200410096104 CN 200410096104 CN 200410096104 A CN200410096104 A CN 200410096104A CN 100476579 C CN100476579 C CN 100476579C
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microlens
projection screen
rear projection
layer
screen
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CN 200410096104
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CN1603942A (en
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罗筱泠
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罗筱泠
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/54Accessories
    • G03B21/56Projection screens
    • G03B21/60Projection screens characterised by the nature of the surface
    • G03B21/62Translucent screens

Abstract

本发明公开了一种多层微透镜结构的背投影屏幕:背投影屏幕为由多层叠加在一起的微透镜构成的微透镜层,每层微透镜的两个折射面两侧均分别为高折射率物质和低折射率物质。 The present invention discloses a rear projection screen of a multi-layer microlens structure: microlens microlens layer composed of multiple superposed together by a rear projection screen, two side surfaces of each layer refractive microlenses each with a high refractive material and the low refractive material. 还公开了这种背投影屏幕的制造方法。 Also disclosed is a method for producing such a rear projection screen. 这种背投影屏幕具有视角均匀度好、无太阳效应的优点,而且成本低廉。 Such a rear projection screen viewing angle with good uniformity, no advantage of the sun effect, and low cost.

Description

多层微透镜结构的背投影屏幕及制造方法 A method of manufacturing a rear projection screen and the microlens multilayer structure

技术领域 FIELD

本发明涉及电视成像技术,具体来说是一种背投影屏蓁技术,涉及了该种屏幕结构及制造方法, The present invention relates to television imaging techniques, particularly a rear projection screen Zhen technique involves the structure and manufacturing method of screen types,

背景技术 Background technique

背投影屏幕是背投电视的关键部件,如图1所示,其主要功能是 A rear projection screen is a key component of the rear-projection TV shown in FIG. 1, its main function is

当来自系统内部投影镜头1的光线在屏幂2上成像后,使各像点(像素)的光线都能往观众的方向以最大的角度散射开去,从而使得每个像点的光线都能进入观众眼球,观众就可以观赏到整个屏幕的图像了。 When light from the interior of the projection lens system 1 after the image on the screen 2 a power of each image dot (pixel) can light toward the viewer with maximum angle scattering away, so that the light in each image point can be into the viewers eye, viewers can watch the entire screen of the image. 可以理解的是,如果背投影屏幕不具备这种散射能力,也就是说, 各像点的光线仍按各自入射光方向射出,这些光线就很难同时进入观众眼球,那么观众是看不到整个画面的。 It will be appreciated that, if such a rear projection screen does not have the scattering power, i.e., light of each respective image point based upon the direction of the incident light is emitted, which light it is difficult to simultaneously enter the viewers eye, then the viewer can not see the whole screen. 屏幕的这种散射能力一般通过水平视角和垂直视角来表达。 Such scattering power of the screen is generally expressed by the horizontal and vertical viewing. 水平视角代表屏幕在水平方向的散射角度,垂直视角代表屏幕在垂直方向获得的散射角度。 Representative horizontal viewing angle scattering screen in the horizontal direction, the vertical viewing angle representative of scattering angles in the vertical direction of the screen is obtained. 如图2所示,水平和垂直视角的最大值均为180度。 As shown, the maximum horizontal and vertical viewing angles are 180 degrees 2. 超过180度的部分实际上是对光线的反射,观众也看不到。 More than 180 degrees is actually a portion of the reflected light, the audience can not see.

另外,屏幕材料会反射和吸收一定的光线。 Further, the screen material will reflect and absorb some light. 反射和吸收都会对光线造成损耗,从而造成屏幕实际透光率降低,这种损耗的程度通常用增益来表达。 Reflection and absorption will cause loss of light, resulting in reducing the light transmittance of the actual screen, this level is usually expressed loss gain. 增益越大的屏幕对光线的损耗越小,屏幕透光率越高,画面也越亮。 The larger the loss of screen gain of light, the higher the light transmittance of the screen, the picture is brighter. 除此之外,对比度和清晰度也是屏幕的重要参数。 In addition, contrast and sharpness are also important parameters of the screen.

另外,值得强调的是,在评价屏幕质量时人们往往会忽略视角均匀度这个概念。 In addition, it is worth to emphasize that, in evaluating the quality of the screen that people tend to ignore the perspective of the uniformity of this concept. 所谓视角均匀度反映的是屏幕在各个视角方向上散射光亮度的均匀性。 The so-called viewing angle of the screen reflects the uniformity in the respective viewing direction of the scattered light uniform brightness. 实际上,屏幕在不同方向上的散射能力是不同的, 这就造成不同方向上的光强有所不同,从而使观众在不同方向上看到的屏幕亮度不同。 In fact, the screen in different directions is different scattering ability, which resulted in strong light in different directions are different, so that the audience can see the screen brightness in different directions different. 通常我们把最大光强方向称为主力散射方向。 Usually we put maximum intensity direction is called the main scattering direction. 视角均匀度可以用最小光强与最大光强的百分比来定量计算。 Perspective uniformity can be quantified by calculating the minimum light intensity and percentage of maximum intensity. 通常,普通 In general, ordinary

CRT (Crystal Ray Tube,阴极射线管)电视(这里主要指29寸以下的)能够达到80%以上的视角均匀度,观众从各个角度观看都会感觉到屏幕的亮度是基本相近的。 CRT (Crystal Ray Tube, a cathode ray tube) television (mainly referring to the 29-inch or less) can reach 80% or more homogeneity perspective, viewers will feel the brightness of the screen from all angles are substantially similar. 对于背投电视来说,因为屏幕的限制却很难达到这种水平。 For rear-projection TV, because of the limited screen but difficult to achieve this level. 这主要是由于下述的原因: This is mainly due to the following reasons:

目前,背投影屏幕根据内部结构主要分为带微观光学结构的背投影屏幕(简称徼结构屏幕或光学幕)和微观粒子散射式背投影屏幕(简称散射幕)两大类。 Currently, the internal structure of a rear projection screen is divided into a rear projection screen with a microscopic optical structure (referred to go around or optical curtain screen structure) and the micro-particles scattering rear projection screen (the scattering screen) into two categories.

如图3所示:对大多数散射幕2而言,主力散射方向与该位置从投影镜头1发出的光线的入射方向往往是一致的。 3: majority of the incident direction of the light scattering screen 2, the position of the main scattering direction of a light emitted from the projection lens tends to be consistent. 对该位置的其它散射方向而言,越偏离主力散射方向光强越低,当你从不同角度观看屏幕时,眼睛的视线方向正好与较近区域的主力散射光线方向一致,因此始终是离眼睛较近的区域更亮,而较远的区域较暗,这就是所谓的太阳效应或称亮斑效应。 For the other direction of the scattering position, the deviation from the main direction light scattering intensity lower, when you watch the screen from different angles, just gaze direction of the eye coincides with the main direction of the scattered light near region, away from the eyes always so close to the area brighter, darker and more distant areas, which is called the effects of the sun or a bright spot, said effect. 用玻璃微珠等高折射率材料代替散射微粒制 Instead of scattering particles made of a material with a high refractive index glass beads

作的散射幕虽然能使太阳效应有所缓解,但仍不能从根本上消除该现象。 Although the curtain for the scattering effects of the sun can be eased, but still fundamentally eliminate this phenomenon. 由于散射幕观赏效果低劣,所以己渐渐从市场退出,取而代之的 Since the scattering screen viewing poor, so has gradually withdraw from the market, replaced

是微结构的光学屏幕。 The screen is an optical microstructure. 如图4所示,徼结构屏幕通过在散射层2的前面增加一个菲涅尔透镜或螺纹镜3,使得投影镜头1发出的光线在进入散射层2之前的入射方向被菲涅尔透镜或嫘纹镜3全部调整为与屏幕垂直,这样,穿过散射层2后的各区域的主力散射光线方向始终保持与屏幕垂直,当观众正对屏幕(视线与屏幕垂直)观赏时可获得最高的亮度效果。 4, go around the screen configuration increases a Fresnel lens or a screw through the front mirror 3 of the scattering layer 2, so that a light emitted from the projection lens in the incident direction before entering the scattering layer 2 is a Fresnel lens or Lei pattern mirror 3 are all adjusted to be perpendicular to the screen, so that scattered light passes through the main direction of each region of the scattering layer 2 remains perpendicular to the screen when the viewer is on the screen (line of sight perpendicular to the screen) to watch the highest brightness obtained effect. 而当观众改变视角从侧面观看时,各区域的散射光线的光强度都同步下降,虽然下降的幅度略有不同(仍然是较远的区域下降多一点),但这种差异能被控制在较小的范围内。 When the viewer changes the viewing angle from the side, the light intensity of the scattered light in each region are synchronized decreased, although the decrease slightly different (still falling a little farther region), but this difference can be controlled in a relatively within a small range. 所以虽然屏幕整体亮度下降了,但太阳效应能被基本避免,微结构屏幕也因此被市场广泛接受。 So while the overall screen brightness down, but the effects of the sun can be substantially avoided, the microstructure of the screen has therefore been widely accepted by the market. 与透镜3配合使用的微结构屏幕的散射层2多种多样, 有的釆用如图5a所示的微透镜,也有的釆用如图5b所示的玻璃微珠等。 Microstructure with screen 3 and the lens used varied scattering layer 2, as shown in some of the microlens Bian with FIG. 5a, and some glass beads preclude the use and the like as shown in FIG. 5b. 其中,微透镜3的形状也是多种多样,图5中只示出其中一种。 Wherein the shape of the microlens 3 is varied, FIG. 5 shows only one. 另外,由于大尺寸的菲涅尔透镜或蠊纹镜需要相当昂贵的模具和具有较高的加工成本,所以造成微结构屏幕价格长期居高不下,对背投电视的普及造成了负面影响。 Further, due to the large size of the Fresnel lens pattern mirror or cockroach requires considerable expensive molds and have a high processing costs, the resulting microstructure long screen prices high, the popularity of television projection had a negative impact. 有的厂家为降低成本,使用锥型波导管或锥型透镜作散射层,并省去菲涅尔透镜等前置元件。 Some manufacturers to reduce cost, conical or tapered waveguide lens as a scattering layer, and the like omitted front Fresnel lens element. 这样的屏幕由于在四周入射角较大的区域,光线在波导管或透镜内多次反射,光损失较大,造成了屏幕在四个角上光线比较暗淡,严重影响画面质量,虽然成本降低了,但却是以牺牲屏幕的画面质量为代价,所以也难以普及。 Because such a screen area around the large incident angle, the light in the waveguide or multiple reflections within the lens, light loss is large, resulting in the four corners of the screen relatively dim light, seriously affect the image quality, while reducing the cost , but at the expense of image quality at the expense of the screen, so it is difficult to spread.

从前文可以了解到,目前使用的光学微结构屏幕虽然回避了太阳效应的问题,但仍不能提供很好的视角均匀度。 From the foregoing it can be understood that optical microstructures screen currently in use, although the effects of the sun to avoid the problem, but still can not provide a good viewing angle uniformity. 当观众以较大视角观察屏幕时,因为屏幕的视角均匀度较差,屏幕亮度将会整体明显下降。 When the viewer viewing the screen at a large angle of view, because of the poor uniformity of the viewing angle of the screen, the screen brightness will be significantly decreased overall.

从这方面讲,背投电视的观赏效果仍不能与普通CRT电视媲美。 In this respect, the rear-projection TV viewing is still not comparable to ordinary CRT TV. 虽然有厂家宣传其背投电视能达到180度视角,实际当你大视角观赏时,其亮度不及正面亮度的二分之一,有的甚至不到三分之一。 Although manufacturers to promote their rear-projection TV can reach 180 degrees viewing angle, when you actually watch the large viewing angle, the brightness of the front luminance is less than one-half, or even less than a third. 所以, 目前的背投影屏幕的整体画面效果仍不是很理想。 Therefore, the current overall picture of the effect of a rear projection screen is still not very satisfactory. 发明内容 SUMMARY

本发明正是针对现有的背投影屏幕在视角均匀度方面存在的上述不足,提供一种多层微透镜结构的背投影屏幕,这种背投影屏幕不仅能消除太阳效应,而且能获得较高视角均匀度,使得背投电视达到与CRT相同的亮度观赏效果。 The present invention is in view of the above deficiencies of the prior existence of a rear projection screen viewing angle uniformity aspect, there is provided a rear projection screen of a multi-layer microlens structure, such a rear projection screen not only eliminate effects of the sun, but also obtain a higher viewing angle uniformity, so that the CRT rear-projection TV to achieve the same brightness with viewing.

本发明的第二个目的还在于还提供一种多层微透镜结构的背投影屏幕的制造方法,该方法使这种背投影屏幕的造价低廉,为背投电视的普及创造了良好条件。 A second object of the present invention is also to provide a method of manufacturing a rear projection screen is a microlens structure of a multilayer, the low cost method of making such a rear projection screen, to create good conditions for the popularity of rear projection television.

为了实现本发明的第一个目的,本发明采用的技术方案为- To achieve the first object of the present invention, the technical solution of the present invention is employed -

一种多层微透镜结构的背投影屏幕,背投影屏幕为由多层叠加在一起的由多个各种自然形状的微透镜所形成的微透镜层所构成,每层微透镜的两个折射面两侧均分别为高折射率物质和低折射率物质。 A multilayer structure of the microlens rear projection screen, a rear projection screen by multiple superposed together microlens layer by a plurality of microlenses formed of various natural shape constituted, two each refractive microlens both side surfaces are respectively a high refractive index material and a low refractive material.

本发明中的透镜,是指广义的透镜,即拥有两个面,并利用这两个面对光线进行折射的透明物体。 Lens of the present invention, refers broadly to lenses, i.e., it has two faces, and using the two refracted rays facing the transparent object.

所述的微透镜的两个折射面可以是一个曲面和一个平面的组合, 或者是两个曲面的组合,就本发明而言,曲面起到对光散射的作用。 The two refractive surfaces of the microlenses and may be a combination of flat, curved or a combination of two surfaces, as regards the present invention, the curved surface acts on light scattering. 所述的高折射率物质是指光密物质,例如玻璃、树脂等;而低折射率物质是指相对于高折射率物质来说折射率较低的物质,即光疏物质,例如可以为空气或其它光介质。 The high refractive index material means optically dense substances, such as glass, resin or the like; and a low refractive index material with a lower refractive index refers to material for the high refractive index material, i.e., the optically thinner substance, for example, an air or other optical media.

本发明采用多层微透镜叠加结构。 The present invention employs a microlens multilayer laminated structure. 微透镜各折射面两侧均分别为高折射率物质和低折射率物质,以确保每一层都有较高散射能力。 Each refractive microlens side surfaces each with a high refractive index material and a low refractive material, to ensure that each layer has a higher scattering ability. Gao

折射率物质与低折射率物质的折射率差距越大,散射能力越强。 Refractive index as the refractive index material and a low refractive index gap material, the stronger the scattering ability. 当光线穿透各微透镜层时,主力散射方向的光强被多次削弱,而其它方向的光强逐层累加,最终达到与主力散射方向相接近的光强,从而能够获得很高的视角均匀度。 When light penetrates each microlens layer, a light scattering intensity of the main direction is repeatedly weakened, while the light intensity accumulating layer by layer in other directions, and ultimately achieve the scattering light intensity and the direction close to the main, high viewing angle can be obtained Evenness. 所以,由于采用这样的分层散射机制,不管入射方向如何,所获得的视角均匀度都很高,因此不需要在其前面设置菲涅尔镜或螺纹镜。 Therefore, since such a layered scattering mechanism, regardless of the incident direction, viewing angle uniformity obtained very high, and therefore no need to provide a Fresnel lens or a mirror in front of the screw. 且各透镜层可使用同一模具制造,因此制造成本将大幅度下降。 Lens and each layer may be manufactured using the same mold, thus the manufacturing cost will fall significantly. 由于保证了视角均匀度,所以太阳效应也自然消失, 获得了更加优良的画面综合质量。 Due to ensure the uniformity of perspective, so the effects of the sun disappear naturally, to obtain a more comprehensive picture of excellent quality.

本发明中在背投影屏幕中还可增加一层吸光层,以吸收反射的环境光,增强对比度。 In the present invention, a rear projection screen in ambient light level may also increase light absorption layer to absorb reflected enhance contrast.

本发明还提供了该种多层微透镜结构的背投影屏幕的制造方法, The present invention also provides a method of manufacturing a rear projection screen of the kind of a multilayer structure of the microlenses,

采用高透光率和高折射率的材料做基材,用磨砂工艺将基材表面处理 High transmittance and high refractive index materials do substrate, the substrate surface is treated with the grinding process

形成多个各种自然形状的微透镜,按预定尺寸切割后平铺并堆叠整齐, 压上一层尺寸相当的重物板,使其相互紧贴排出多余空气,然后将各 Forming a plurality of microlenses natural shapes, and the tile neatly stacked, pressure on the layer corresponding to the size of the weight plates cut to a predetermined size to expel excess air against one another, and each of

透镜层四周用粘合剂相互粘牢、密封。 Four weeks each lens layer with an adhesive cement, the seal.

所述的基材优选树脂材料,基材厚度以O. 1〜0. 2mm为宜。 The substrate is preferably a resin material, the base material thickness to O. 1~0. 2mm appropriate.

基材可单面磨砂也可双面磨砂形成透镜。 The substrate may also be one-sided matte formed sided frosted lens. 本发明提供的这种背投影屏幕的制造方法釆用现有的成熟的磨砂工艺制备微透镜层,以空气为低折射率物质,并在四周粘接密封,具有制作简便、材料成本和加工成本低的优点,可显著降低这种多层微透镜结构的背投影屏幕的成本,为这种背投影屏幕的推广创造了条件。 This method of manufacturing a rear projection screen of the present invention provides mature preclude the use of conventional grinding process preparing microlens layer, a low refractive index material to the air, and sealed around the adhesive, having a simple production, material and processing costs advantages of low, can significantly reduce the cost of such a rear projection screen microlens multilayer structure, such as a rear projection screen to promote the creation of conditions. 本发明提供的这种背投影屏幕不仅能消除太阳效应,而且能获得 The present invention provides such a rear projection screen not only removes the effects of the sun, and can be obtained

较高视角均匀度,使得背投电视达到与CRT相同的亮度观赏效果, High viewing angle uniformity, so that the CRT rear-projection TV to achieve the same brightness with viewing,

其综合画面质i高于现有的背投影屏幕。 I its comprehensive picture quality than the conventional rear projection screen.

附图说明 BRIEF DESCRIPTION

图1为背投影屏幕光学原理图; Figure 1 is a schematic diagram of a rear projection screen optics;

图2为背投影屏幂的视角图; FIG 2 is a perspective rear projection screen of FIG power;

图3为背投影屏幕的太阳效应原理图; Figure 3 is a schematic diagram of the solar effect rear projection screen;

图4为现有技术中微结构光学屏幕原理图; FIG 4 is a prior art schematic diagram of a microstructure of the optical screen;

图5现有的微结构光学屏幕的结构图; 5 is a block diagram of a conventional micro-optical screen;

图6为本发明的多层微透镜结构的背投影屏幕的结构示意图; 图7为本发明的多层微透镜结构的背投影屏幕的光学原理图; 图8-图14为本发明的多层微透镜结构的背投影屏幕的结构示意图。 A schematic view of a multilayer structure of a rear projection screen of FIG. 6 microlens structure of the present invention; an optical schematic of a rear projection screen multilayer microlens structure of the present invention in FIG. 7; FIGS. 8 to 14 of the present invention, a multilayer schematic view of a rear projection screen is a microlens structure.

图中,以箭头的长度来近似表示该方向光强的大小。 Figure, to approximate the length of the arrow direction light intensity of the size. 具体实施方式 Detailed ways

下面结合附图和具体实施方式对本发明的多层微透镜结构的背投影屏幕作进一步说明。 Next, the rear projection screen microlens multilayer structure of the present invention will be further described in conjunction with the accompanying drawings and specific embodiments. 实施例1如图6所示,本发明的多层微透镜结构的背投影屏幂,为由两层以上的微透镜4叠加形成的微透镜层,每层微透镜4的两个折射面两侧均分别为高折射率物质41和低折射率物质5,髙折射率物质是指光密物质,例如玻璃、树脂等;而低折射率物质是指相对于高折射率物质来说折射率较低的物质,即光疏物质,例如为空气或其它低折射率光介质,当为空气时,其材料成本、制作成本更低。 Example 1 shown in FIG. 6, a rear projection screen microlens power multilayer structure of the present invention, two or more layers microlens layer 4 microlens formed by the superposition, each micro-lens including two refracting surfaces of two 4 each with a side of the high refractive material and the low refractive index substance 41 5, Gao refractive index optically dense substance means a substance, such as glass, resin or the like; and a low refractive index material refers to a relative refractive index is relatively high refractive index substance low substance, i.e. the optically thinner substance, for example air or other low index optical medium, when the air, material cost, lower production costs.

光线从高折射率物质进入低折射率物质以及从低折射率物质射入高折射率物质时均会产生折射,这样每层透镜均会产生较强的散射能 Light from a high refractive index material and a low refractive index material into the low refractive index material is incident on the high refractive index material will refraction, so that each lens will produce a strong scattering power

力,且折射面两侧的物质的折射率差值越大,透镜的散射能力越强。 Force, the greater the difference in refractive index and the refractive surfaces on both sides of the material, the stronger the scattering power of the lens. 如图7所示,光束在各层的散射点实际并不相同,如果该间距较大, 从观众的角度上看,可能会认为它是不同的像点,这就会降低画面的分辨率。 7, the light beam is not actually in the same layers of the scattering point, if the spacing is larger, from the viewer's point of view, it might be that different image points, which lowers the resolution of the screen. 该散射点的距离与每层透镜厚度有关,也就时说与整个屏幕 And the distance from the scattering point related to the thickness of each layer of the lens, the entire screen is to say

的总厚度有关,屏幕厚度越大,在屏幕两侧的散射点的距离越大,屏幕的画面分辨率越低。 The total thickness, the greater thickness of the screen, the greater the distance from the scattering points on both sides of the screen, the screen resolution of the lower screen. 只要屏幕足够薄,各散射点位置的差异就能小到低于屏幕的像点自身大小的程度,从而在视觉上认为那些散射光线仍是从同一个像点发出的,此时不会对分辨率产生影响。 As long as the screen is sufficiently thin, the position differences can scatterers to the extent of their small size screen below the image point, so that those scattered rays are still emitted from the same point on the visual image, this time will not distinguish rate impact. 既然各层散射点的散射光线被视为出自同一个像点,该像点在所有非主力散射方向上的光强就相当于对应各层散射点光线之和,而最后一层的主力散射方向的光强代表该像点在该方向上的光强,所以经过各层散射后, 与入射光方向相同的主力散射方向的光强被多次削弱,而其它方向的光强因各层散射光的光强逐层累加而增强,最终可达到与主力散射方向相接近的光强,从而获得很高的视角均匀度。 Since the scattered light scattering layers is considered from the same point as a point, the light intensity of the image points on all non-main scattering direction is equivalent to the corresponding point light scattering layers and the sum, and the last layer of the main scattering direction light intensity representative of the light intensity of the image point in this direction, so after scattering layers, the same as the direction of the incident light intensity times the main scattering direction is weakened, while the light intensity in other directions due to the light scattering layers layer by layer the accumulated light intensity is enhanced, and eventually reach the main direction of the scattering intensity close, thereby obtaining a high viewing angle uniformity. 可以理解的是,微透镜散射次数越多,视角均匀度就越好,但亮度会因此而下降。 It will be appreciated that the more the number of microlenses scattering, the better the uniformity of viewing angle, but the brightness will thus decrease. 因此在两者之间应权衡选择。 Therefore choose between the two should be weighed. 一般,整个微透镜层 In general, the entire microlens layer

总共应至少含有3个以上的曲面。 It should contain a total of at least three or more surfaces. 拥有4层以上曲面能获得80%以上的视角均匀度。 4 has more surface layers to obtain more than 80% of the viewing angle uniformity. 微透镜应选择高透光率材料,以减少亮度损失。 Microlens material with high transmittance should be selected to minimize loss of brightness. 高透光率的材料如光学塑料,透光率一般可达90%以上,且这种材料有较高的折射率。 Material having high light transmittance, such as optical plastic, light transmittance of generally 90% or more, and this material has a higher refractive index.

根据前述,为保证高清晰度,微透镜层越薄越好,叠放紧密, 整个屏幕总厚度以不超过lmm为最佳。 According to the foregoing, in order to ensure a high definition thinner, the better the microlens layer, stacked tightly, the total thickness of the entire screen is best not more than lmm. 相应的微透镜的直径可设置在0.02^0.15mm之间。 Diameter of the respective microlenses may be disposed between 0.02 ^ 0.15mm.

根据本发明的原理可知,透镜层可以采用如图8所示的双面微透镜层(或双凸透镜层,即两面均为凸面的透镜层),与图6所示的单面微透镜层(或平凸透镜层,即一面为平面一面为凸面的透镜层)相比,减少了不必要的折射面,从而可在视角均匀度相同的情况下获得较高的透光率和对比度。 According to principles of the present invention will become apparent, the lens layer may be a double-sided microlens layer shown in FIG. 8 (or lenticular lens layer, i.e. on both sides, the convex lens layer), one side of the microlens layer shown in FIG. 6 ( or plano layers, i.e. the side as compared to the side of the convex lens layer) plane, reduce unnecessary refractive surface, thereby obtaining high transmittance and contrast ratio in the case where the same viewing angle uniformity. 当然,也可以选用单双面相结合(图中未示出)的形式。 Of course, also be chosen in conjunction with single and double surface (not shown) form.

如图9a所示,各层透镜可以不需要相互对应。 As shown in FIG 9a, the lens layers may not necessarily correspond to each other. 并且,如图9b所示,平凸透镜层的叠放方式可以自由选择,如可改为平面对平面,凸面对凸面放置。 And shown in Figure 9b, stacking the flat lens layer can be freely selected, as can be to a flat plane, the convex face of the convex surface is placed.

透镜的形状可以多种多样。 Shape of the lens can be varied. 既可以是图8、图9所示的凸面镜, 也可以如图IO所示,低折射率物貭层5之间的高折射率41部分为凹面镜,或为图13、图14所示的不规则形状。 FIG 8 may be a, a convex shown in FIG. 9, as shown in FIG IO, 41 portion of the high refractive index between the low refractive index layer 5 was Zhi concave mirror, or FIG. 13, FIG. 14 the irregular shape. 从正面看,微透镜既可以是如图11所示的矩形,也可以如图12所示为圆形、椭圆形、多边形、锥型等或其它形状。 From the front, the microlenses may be a rectangle as shown in FIG. 11, a circular, oval, polygonal, or other shapes like cone 12 may be as shown in FIG.

由于各折射面对环境光线有一定的反射,且层数越多,反射越多, 这样会降低屏幕的对比度。 Since each face of refraction of ambient light has a certain reflection, and more layers, the more reflective, this will reduce the contrast of the screen. 可增加一层吸光层,吸收反射的环境光, 增加对比度。 A layer of light absorbing layer is increased, the reflected ambient light absorption, increase contrast. 吸光物质可以是颜料、染料、碳黑等,这些都是目前背投影屏幕普遍使用的吸光材料。 Light-absorbing material may be a pigment, a dye, carbon black, etc., these are the back-projection screen the light-absorbing materials commonly used. 也可以直接将这些物质直接适量添加到透镜层中。 May be directly added amount of these substances directly to the lens layer. 也或者将吸光物质添加到保护屏中。 Or the light-absorbing substance is also added to protect the screen. 所谓保护屏是通常设置在背投影屏幕最外层,起防尘、防油污或防划伤作用的保护层, The so-called protective screen is generally provided a rear projection screen in the protective layer is the outermost layer from dust, oil, or scratch effect,

约4mm厚, 一般为树脂材料。 About 4mm thick, typically a resin material. 实施例2 Example 2

本实施例是以树脂材料作为高折射率物质,以空气为低折射率物质,提供一种多层微透镜结构的背投影屏幕的制造方法: The present embodiment is a resin material is used as a high refractive index material, a low refractive index material in air, there is provided a method of manufacturing a rear projection screen a microlens multilayer structure:

采用高透光率和高折射率的树脂材料做基材,厚度以0.1-0.2mm 为宜,采用目前成熟的磨砂工艺将树脂表面处理后,使树脂表面形成如图13或图14所示的各种自然形状的透镜。 High transmittance and a high refractive index material of the resin substrate is made, preferably 0.1-0.2mm in thickness, using the grinding process will mature resin surface treatment, the resin surface 13 or 14 as shown in FIG. natural lens shapes. 可如图13 —样单面磨砂,也可如图14所示双面磨砂。 It may be as 13-- sided matte-like, double-sided matte 14 may be as shown in FIG. 这样,微透镜层就制作好了。 In this way, the microlens layer on the production well. 将多层微透镜层按预定尺寸切割后平铺并堆叠整齐,压上一层尺寸相当的重物板,使其相互紧贴排出多余空气。 The microlens layer after cutting the multilayer tile and neatly stack a predetermined size, the size of pressure on the layer equivalent weight plates, against one another so as to discharge excess air. 然后将各透镜层四周用粘合剂之类相互粘牢、密封。 Then each lens cement layer four weeks each other with an adhesive or the like sealed. 这样可保证透镜层之间仍有适量空气充当光疏物质,又可防止多余空气进入透镜层之间导致透镜层变形、间距增大等。 This ensures that there is still an air amount between the lens layer acts as the optically thinner substance, and prevents excess air from entering the result in the lens layer is deformed, increasing the spacing between the lens layer and the like. 这样, 一种超薄的多层微透镜屏幕就算做好了。 In this way, an ultra-thin multilayer microlens screen even do a good job.

以上操作均在常温常压下进行,无需模具,磨砂工艺简单,对背投影屏幕而言可谓生产成本空前低廉。 The above operations were carried out at room temperature and pressure, without a mold, simple grinding process, a rear projection screen can be described in terms of an unprecedented low cost.

Claims (10)

1、一种多层微透镜结构的背投影屏幕,其特征在于:背投影屏幕为由多层叠加在一起的由多个各种自然形状的微透镜所形成的微透镜层所构成,每层微透镜的两个折射面两侧均分别为高折射率物质和低折射率物质。 1, a multilayer structure of the microlens rear projection screen, comprising: a rear projection screen by multiple superposed together microlens layer by a plurality of microlenses formed of various natural shape constituted, each two side surfaces refractive microlenses each with a high refractive index material and a low refractive material.
2、 如权利要求1所述的多层微透镜结构的背投影屏幕,其特征在于:所述的微透镜的两个折射面是一个曲面和一个平面的组合,或者是两个曲面的组合。 2, a rear projection screen as claimed in claim 1 microlens multilayer structure, characterized in that: two refractive surfaces of the microlenses is a combination of a curved surface and a plane, or a combination of two surfaces.
3、 如权利要求1或2所述的多层微透镜结构的背投影屏幕,其特征在于:所述的高折射率物质为玻璃或树脂。 3, a rear projection screen as claimed in claim 12 or microlens multilayer structure, characterized in that: said high refractive index material is glass or resin.
4、 如权利要求1或2所述的多层微透镜结构的背投影屏幕,其特征在于:所述的低折射率物质为空气。 4, a rear projection screen as claimed in claim 12 or microlens multilayer structure, characterized in that: said low refractive index material is air.
5、 如权利要求1或2所述的多层微透镜结构的背投影屏幕,其特征在于:所述的微透镜层有4层以上的曲面。 5, a rear projection screen as claimed in claim 12 or microlens multilayer structure, characterized in that: said microlens layer has four or more layers of the surface.
6、 如权利要求1或2所述的多层微透镜结构的背投影屏幕,其特征在于:所述的微透镜层的总厚度不超过lnim,所述的微透镜的直《5为0. 02〜0. 15咖。 6, a rear projection screen as claimed in claim 12 or microlens multilayer structure, characterized in that: the total thickness of the microlens layer is not more than LNIM, the microlenses straight "5 0. 02~0. 15 coffee.
7、 如权利要求1或2所述的多层微透镜结构的背投影屏幕,其特征在于:还包括一层吸光层。 7, a rear projection screen as claimed in claim 12 or microlens multilayer structure, characterized in that: further comprising a layer of light absorbing layer.
8、 一种多层微透镜结构的背投影屏幕的制造方法,其特征在于-采用高透光率和高折射率的材料做基材,用磨砂工艺将基材表面进行处理形成多个各种自然形状的微透镜,按预定尺寸切割后平铺并堆叠整齐,压上一层尺寸相当的重物板,使其相互紧贴排出多余空气,然后将各透镜层四周用粘合剂之类相互粘牢、密封。 8. A method of manufacturing a rear projection screen is a microlens structure of a multilayer, characterized in that - using a material of high light transmittance and high refractive index do substrate, the substrate surface is treated with the grinding process to form a plurality of various the natural shape of the microlens, a predetermined size of the tile cut and stacked neatly on one pressure plate of comparable dimensions, weight, against one another so as to discharge excess air, and then each of the lens layer surrounded by an adhesive or the like to each other cement seal.
9、 如权利要求8所述的多层微透镜结构的背投影屏幕的制造方法,其特征在于:所述的基材为树脂,厚度为O. 1〜0. 2mm。 9. A method of manufacturing a rear projection screen of claim 8 microlens multilayer structure, characterized in that: said substrate is a resin, having a thickness of O. 1~0 2mm..
10、 如权利要求8或9所述的多层微透镜结构的背投影屏幕的制造方法,其特征在于:所述的基材采用单面磨砂或双面磨砂形成透镜。 10. A method of manufacturing a rear projection screen of claim 8 or 9 microlens multilayer structure, characterized in that: said substrate using a double-sided or single-sided matte frosted lens is formed.
CN 200410096104 2004-11-26 2004-11-26 Back-projection screen with multilayer microlens structure and manufacturing method CN100476579C (en)

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