WO2018113314A1 - 一种dlp背投拼接投影系统 - Google Patents

一种dlp背投拼接投影系统 Download PDF

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Publication number
WO2018113314A1
WO2018113314A1 PCT/CN2017/096496 CN2017096496W WO2018113314A1 WO 2018113314 A1 WO2018113314 A1 WO 2018113314A1 CN 2017096496 W CN2017096496 W CN 2017096496W WO 2018113314 A1 WO2018113314 A1 WO 2018113314A1
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Prior art keywords
lens
projection
light
screen
center
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PCT/CN2017/096496
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English (en)
French (fr)
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刘海勇
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威创集团股份有限公司
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Publication of WO2018113314A1 publication Critical patent/WO2018113314A1/zh

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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • 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
    • G03B21/208—Homogenising, shaping of the illumination light

Definitions

  • the present invention relates to the field of projection, and more particularly to a DLP rear projection mosaic projection system.
  • Smart city has become a symbol of the era of big data.
  • Various integrated data such as security/traffic/climate/financial are inseparable from large-screen display, so DLP/LED/LCD splicing large screen has entered the control halls of smart cities. And the outdoor wall, and play the role of real-time data data, so that smart cities can operate intelligently.
  • DLP's delicate and seamless display is particularly advantageous, so DLP is the best choice for controlling the display wall of the hall.
  • the light source of the rear-projection DLP has experienced UHP (Ultra High Pressure Mercury Lamp) technology.
  • the DLP rear projection splicing wall projection system includes a projector 101 and an optical screen 102, which is required to be improved in optical path according to the gain coefficient of the optical screen 102.
  • the projector 101 includes an optical engine as shown in FIG.
  • the light combining module 201 can be a high-brightness LED, a laser fluorescent wheel, and a three-color laser combining module; the L1/L2/L3/L4 combination acts as a projector optical engine.
  • the effect of the relay optical path is that the brightness uniformity of the integrator rod 203 is 90% to 95%.
  • the brightness uniformity of the conventional projector is about 85%, and the uniformity of the optical screen 102 is about 90%.
  • the uniformity of the light output of the entire display unit is 85% to 90%, and it is usually difficult to achieve 95% of the effect, so there will be a solid color (such as white/green/cyan/yellow).
  • the phenomenon of the dark side vignetting angles 302, 304, and 402 appearing in the commonly used 4:3 and 16:9 pictures affects the display effect.
  • the method of improving the brightness uniformity of the screen is to process the semaphore of the projector, for example, by reducing the brightness value in the semaphore of the central region of the digital micro mirror 209 to improve the brightness uniformity of the entire display unit.
  • the disadvantage is that the signal quality is sacrificed, which leads to the transition of the 256 gray scale of the projector.
  • the white field bright spot problem will occur seriously, which means that although this method can improve the brightness uniformity index to a certain extent,
  • the premise is that the projector's display is sacrificed.
  • the present invention provides a DLP rear projection splicing projection system that improves brightness uniformity at the front of the screen while ensuring that the display effect is not sacrificed.
  • a DLP rear projection splicing projection system including a light combining module, a concentrating mirror, an integrator rod, an L1 lens, an L2 lens, an L3 lens, an L4 lens, a total reflection prism, a digital micro mirror, a projection lens, and a light emitting module
  • the light enters the digital micro-mirror through the concentrating mirror, the integrator rod, the L1 lens, the L2 lens, the L3 lens, the L4 lens, and the total reflection prism.
  • the light emitted by the projection lens passes through the total reflection prism and enters the digital micro-mirror.
  • the L4 lens is The convex lens comprises an inner layer glass and an antireflection film layer disposed on the spherical surfaces on both sides of the inner layer glass, and the light transmittance of the antireflection film layers on both sides is symmetrically increased from the center to the edge.
  • the brightness of the conventional projector is increased from the center of the screen to the corner of the screen, and the screen gain is gradually reduced from the center to the edge.
  • the present invention improves the L4 lens in the projector system, and sets the transmittance of the antireflection film layer from The center to the edge are sequentially raised.
  • This method solves the relationship between the brightness of the projector and the screen gain by increasing the transmittance of the lens from the center to the edge, improving the brightness of the illumination path of the projector illumination, and improving the brightness of the screen before the screen.
  • Sexuality completely solve the phenomenon of dark edges and dark corners that have always existed on the big screen, bringing a smoother and more delicate viewing experience to the DLP large-screen display.
  • this method does not need to sacrifice the display effect of the projector, and the display quality of the projector is ensured.
  • FIG. 1 is a schematic diagram of a DLP rear projection mosaic wall projection system in the prior art.
  • FIG. 2 is a schematic structural view of an optical engine in a projector in the prior art.
  • FIG. 3 is a schematic diagram of a dark side vignetting phenomenon of a 4:3 unit wall corresponding to a DLP rear projection mosaic wall projection system of the prior art.
  • FIG. 4 is a schematic diagram of a dark side vignetting phenomenon of a 16:9 unit wall corresponding to a DLP rear projection mosaic wall projection system of the prior art.
  • Figure 5 is a schematic diagram of the screen brightness division.
  • FIG. 6 is a schematic structural view of an L4 lens in a DLP rear projection splicing projection system according to the present invention.
  • Figure 7 is a 1/4 cross-sectional view of the L4 lens.
  • Figure 8 is a schematic diagram of 16:9-GUCS screen gain normalization.
  • Figure 9 is a schematic diagram of 4:3-GUCS screen gain normalization.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implied number of technical features indicated. .
  • the defined “first”, “second” features may include one or more of the features, either explicitly or implicitly.
  • a plurality means two or more unless otherwise stated.
  • mounting and “connecting” are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly stated and defined.
  • Ground connection it can be a mechanical connection or an electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be said that the internal connection of the two elements.
  • the specific meaning of the above terms in the present invention can be understood in the specific circumstances by those skilled in the art.
  • the DLP rear projection splicing projection system of the invention specifies the coating of the lens of the projector L4 through the screen gain characteristic, so that the best matching relationship between the two is achieved, so that the brightness uniformity of the real unit before the screen reaches 95% or more.
  • the brightness area of the display unit screen is divided into 13 areas 1-13 as shown in Fig. 5 in strict accordance with the national standard test requirements.
  • the screen before the screen is divided into 16 small squares 503, and the center nine points 505 are at the intersection of the small squares 503. Above, the remaining corners of the four corners 502 are: q1 is one tenth of q2, and the brightness uniformity index is calculated as:
  • a (1 ⁇ 13) is the brightness value of 13 points in front of the screen
  • A0 is the average value of the brightness of the center of the screen. According to the formula analysis, only the difference between the average value of the 13 points and the average value of the center is reduced. The unit uniformity is greater.
  • the conversion relationship between the brightness A of the screen and the illumination of the projector is:
  • the brightness A of the screen is proportional to the illumination of the projector, and is proportional to the gain B of the optical screen 102.
  • the light output of the conventional projector is centered on the edge, and the screen gain is gradually reduced from the center to the edge, so the integrated projector and the screen are integrated.
  • the front brightness center of the conventional display unit is inevitably higher than the edge brightness, so that a plurality of display units are assembled into a display wall, and a dark side vignetting problem occurs at the seam.
  • the problem can be improved by changing the ratio of the light exiting the center and the edge of the projector.
  • the present invention is to improve the L4 lens in the projector, so that the gradual change of the transmittance can solve the brightness of the projector and the screen gain. The relationship thus improves the illumination path of the projector and improves the brightness uniformity of the screen.
  • a DLP rear projection splicing projection system includes a light combining module 201 , a condensing mirror 202 , an integrator rod 203 , an L1 lens 204 , an L2 lens 205 , an L3 lens 206 , and an L4 lens 207 .
  • Total reflection prism 208 Number
  • the light emitted by the micromirror 209, the projection lens 210, and the light combining module 201 sequentially passes through the condensing mirror 202, the integrator rod 203, the L1 lens 204, the L2 lens 205, the L3 lens 206, the L4 lens 207, and the total reflection prism 208 to enter the digital micro reflection.
  • Mirror 209, the light emitted by the projection lens 210 passes through the total reflection prism 208 and enters the digital micro mirror 209;
  • the L4 lens 207 is a convex lens, which comprises an inner glass 2071 and an anti-reflection film layer 2072 disposed on both sides of the inner surface of the inner glass 2071.
  • the transmittance of the anti-reflection film layers 2072 is symmetrically increased from the center to the edge. high.
  • the antireflection film layer 2072 is divided into four parts centering on the central symmetry point, and the average transmittance of each coating layer from the edge to the center is sequentially increased. Several aliquots. In a preferred embodiment, the plurality of aliquots is greater than or equal to 10 aliquots.
  • the transmittance of the aliquot closest to the center is not less than 90%, and the transmittance of the aliquot closest to the edge is not less than 99%.
  • FIG. 7 A specific example is shown in Fig. 7. Taking the 1/4 cross-sectional view of the L4 lens 207 as an illustration, the one side of the antireflection film layer 2072 is equally divided into 10 equal parts from the points B1 to B11, wherein the O point is L4.
  • the center symmetry point of the lens 207, A1 is the midpoint of OB1, B2B1 is the most edged area, and B11B10 is the lens center area.
  • the light transmittance of the B11B10 segment to the B2B1 segment is sequentially increased to match the screen gain relationship, wherein the B11B10 transmittance is not less than 90%, B2B1
  • the penetration rate is not less than 99%.
  • the mainstream resolution of the projector for the DLP display unit of the splicing wall is 1080P, SXGA+ and XGA, that is, the aspect ratio of the screen size is 16:9 corresponding to the 1080P of the projector, and the size ratio is 4:3 corresponding to the SXGA+ and XGA of the projector.
  • the gain normalization value table (based on the center point 5 as the reference 1, the other points gain is divided by the center point gain) as shown in Figure 8, the gain The size gradually decreases from the center point to the periphery of the screen, and the values of the corners 4, 10, 11, 12, and 13 fall to about 0.9, and the edge gain of the screen is also at this level. Therefore, the coating of the L4 lens 207 penetrates from the center to the edge.
  • the rate should be gradually increased from 0.9 to 0.99, that is, the coating penetration rate can be set to be 90% for B11B10, 91% for B10B9, 92% for B9B8, 93% for B8B7, 94% for B7B6, and 95% for B6B5.
  • B5B4 is 96%
  • B4B3 is 97%
  • B3B2 is 98%
  • B2B1 is 99%.
  • the gain normalization value table (based on center point 5 as the reference 1, the other points gain divided by the center point gain Obtained) As shown in Fig. 9, the gain gradually decreases from the center point to the periphery of the screen, and the values of the four corners 10, 11, 12, and 13 fall to about 0.92.
  • the edge gain is also at this level, which is slightly better than the 16:9 screen.
  • the penetration of the L4 lens 207 from the center to the edge should be gradually increased from 0.92 to 0.99, that is, the coating transmittance can be set to: B11B10 is 92%, B10B9 is 92.8%, B9B8 is 93.6%, B8B7 is 94.4%, B7B6 is 95.2%, B6B5 is 96%, B5B4 is 96.8%, B4B39 is 97.6, B3B29 is 98.4%, and B2B1 is 99%.
  • the sex index is basically above 95%, that is, the difference between the brightness of the center point and the edge corner is within 5%, and there is no dark side vignetting problem at the joint between the display units after the wall is assembled.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

一种DLP背投拼接投影系统，其包括合光模组（201）、聚光镜（202）、积分棒（203）、L1镜片（204）、L2镜片（205）、L3镜片（206）、L4镜片（207）、全反射棱镜（208）、数字微反射镜（209）、投影镜头（210），合光模组（201）发出的光依次经过聚光镜（202）、积分棒（203）、L1镜片（204）、L2镜片（205）、L3镜片（206）、L4镜片（207）、全反射棱镜（208）进入数字微反射镜（209），投影镜头（210）发出的光经过全反射棱镜（208）后进入数字微反射镜（209），L4镜片（207）为凸透镜，其包括里层玻璃（2071）和设于里层玻璃两侧球面的增透膜层（2072），两侧增透膜层（2072）的透光率对称地从中心到边缘依次升高。通过对L4镜片（207）进行改进，将其镀膜层的透光率设为从中心到边缘依次升高，改善投影机照明光路的出光亮度，提高屏前亮度均匀性，彻底解决大屏一直存在的暗边暗角的现象。

Description

一种DLP背投拼接投影系统 技术领域
本发明涉及投影领域，更具体地，涉及一种DLP背投拼接投影系统。
背景技术
智慧城市已经成为大数据时代的标志，各种集成数据如:安防/交通/气候/金融等都离不开大屏幕显示，因此DLP/LED/LCD拼接大屏已经走进智慧城市的各控制大厅和户外大墙，且发挥着数据实时视讯的功能，让智慧城市得以智能运转。相比LED/LCD大屏，DLP的细腻无缝显示效果尤占上风，因此目前DLP是控制大厅显示拼接墙的不二选择。背投DLP的光源经历过UHP(超高压汞灯)技术，到目前主流的LED和LPD(激光荧光轮发光)技术，机芯光通量也从1000lm发展到目前的3000lm，但2500lm足以满足室内拼墙显示领域，因此亮度已经不再是背投拼墙界的技术瓶颈。
现在客户更在乎的是背投拼墙的画面一致性，即是亮度均匀性。市面上投影机亮度均匀性大多在90％左右，而搭配屏幕后屏前亮度均匀性大概下降为84％左右，当显示单元边角与中心亮度相差10％以上时，人眼能很明显地察觉到暗边暗角现象。如图1所示，用于DLP背投拼接墙投影系统包括投影机101和光学屏幕102，该投影机101需按照光学屏幕102的增益系数做光路上的改进。投影机101包括如图2所示的光学引擎，该光学引擎包括合光模组201、聚光镜202、积分棒203、L1镜片204、L2镜片205、L3镜片206、L4镜片207、全反射棱镜208、数字微反射镜209、投影镜头210，其中合光模组201可以是高亮LED、激光荧光轮、三色激光合光模组；L1/L2/L3/L4组合充当投影机光学引擎中的中继光路作用，目前积分棒203的出光亮度均匀性为90％～95％，由于工艺上的限制，传统投影机亮度均匀性为85％左右，而光学屏幕102的均匀性为90％左右，那整个显示单元的出光均匀性在85％～90％，通常很难达到95％的效果，因此会存在纯色(如白/绿/青/黄)画面下拼墙看起来会有暗边暗角现，如图3、图4所示的常用4:3和16:9画面出现的暗边暗角302、304、402的现象，从而影响显示效果。
传统提高屏前亮度均匀性的方法是对投影机的信号量进行处理，譬如通过将数字微反射镜209中心区域的信号量中的亮度值降低来提升整个显示单元的亮度均匀性，这样做的劣势是牺牲了信号质量，从而导致投影机的256灰阶有过渡不顺的现象，严重的会出现白场亮斑问题，也就是说这种方法虽然能一定程度地改善亮度均匀性指标，但前提是牺牲了投影机的显示效果。
发明内容
本发明为克服上述现有技术所述的至少一种缺陷(不足)，提供一种提高屏前亮度均匀性的同时保证不牺牲显示效果的DLP背投拼接投影系统。
为解决上述技术问题，本发明的技术方案如下：
一种DLP背投拼接投影系统，包括合光模组、聚光镜、积分棒、L1镜片、L2镜片、L3镜片、L4镜片、全反射棱镜、数字微反射镜、投影镜头，合光模组发出的光依次经过聚光镜、积分棒、L1镜片、L2镜片、L3镜片、L4镜片、全反射棱镜进入数字微反射镜，投影镜头发出的光经过全反射棱镜后进入数字微反射镜，所述L4镜片为凸透镜，其包括里层玻璃和设于里层玻璃两侧球面的增透膜层，两侧增透膜层的透光率对称地从中心到边缘依次升高。
与现有技术相比，本发明技术方案的有益效果是：
传统投影机亮度从画面中心到边缘角落依次升高，而且屏幕增益从中心向边缘逐渐降低，本发明对投影机系统中的L4镜片进行改进，将其增透膜层的透光率设为从中心到边缘依次升高，此方式用镜片透光率从中心到边缘依次升高的趋势来解决投影机亮度与屏幕增益相匹配的关系，改善投影机照明光路的出光亮度，提高屏前亮度均匀性，彻底解决大屏一直存在的暗边暗角的现象，给DLP大屏显示带来更加平滑而且更加细腻的观看体验。而且此方式不需要牺牲投影机的显示效果，保证了投影机的显示质量。
附图说明
图1为现有技术中DLP背投拼接墙投影系统的示意图。
图2为现有技术中投影机中的光学引擎结构示意图。
图3为现有技术的DLP背投拼接墙投影系统对应的4:3单元拼墙暗边暗角现象示意图。
图4为现有技术的DLP背投拼接墙投影系统对应的16:9单元拼墙暗边暗角现象示意图。
图5为屏幕亮度分区示意图。
图6为本发明一种DLP背投拼接投影系统中L4镜片的结构示意图。
图7为L4镜片1/4截面图。
图8为16:9-GUCS屏幕增益归一化示意图。
图9为4:3-GUCS屏幕增益归一化示意图。
具体实施方式
附图仅用于示例性说明，不能理解为对本专利的限制；
为了更好说明本实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；
对于本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。
在本发明的描述中，需要理解的是，此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或隐含所指示的技术特征的数量。由此，限定的“第一”、“第二”的特征可以明示或隐含地包括一个或者更多个该特征。在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以是通过中间媒介间接连接，可以说两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明的具体含义。
下面结合附图和实施例对本发明的技术方案做进一步的说明。
实施例1
本发明的DLP背投拼接投影系统是通过屏幕增益特性指定投影机L4镜片的镀膜，让两者达到最佳匹配关系，从而让现实单元屏前亮度均匀性达到95％以上。将显示单元屏前亮度区域严格按照国标测试要求分成如图5所示的十三个区域1-13，屏前画面平均分成16个小方块503，中心九个点505在小方块503的交叉点上，其余边角四点502位置为：q1长度为q2的十分之一，亮度均匀性指标计算公式为：
Min((1-|A(1～13)-A0|/A0)*100％)
其中A(1～13)为屏前13点亮度值，A0为屏前中心九点的亮度平均值，从公式分析可知，只有13点的照度值与中心九点的平均值差异减小，显示单元均匀性就越大。而屏前亮度A与投影机照度Lux之间的换算关系为：
A＝Lux*B/π
即屏前亮度A与投影机照度Lux成正比，与光学屏幕102增益B也成正比，传统投影机的出光是中心亮于边缘，且屏幕增益从中心向边缘逐渐降低，那么综合投影机与屏幕可知，传统显示单元屏前亮度中心必然高于边缘亮度，从而多个显示单元拼成显示墙后拼缝处会出现暗边暗角问题。这时可以通过改变投影机中心与边缘的出光比例来改善这个问题，本发明正是对投影机中的L4镜片进行改进，使其透光率的渐变趋势能够解决投影机亮度与屏幕增益相匹配的关系，从而改善投影机的照明光路，提高屏前亮度均匀性。
具体地，如图2、6所示，一种DLP背投拼接投影系统，包括合光模组201、聚光镜202、积分棒203、L1镜片204、L2镜片205、L3镜片206、L4镜片207、全反射棱镜208、数字 微反射镜209、投影镜头210，合光模组201发出的光依次经过聚光镜202、积分棒203、L1镜片204、L2镜片205、L3镜片206、L4镜片207、全反射棱镜208进入数字微反射镜209，投影镜头210发出的光经过全反射棱镜208后进入数字微反射镜209；
所述L4镜片207为凸透镜，其包括里层玻璃2071和设于里层玻璃2071两侧球面的增透膜层2072，两侧增透膜层2072的透光率对称地从中心到边缘依次升高。
因透镜具有中心对称特性，为了提高增透膜的均匀性，将增透膜层2072以中心对称点为中心等分为四份，每份镀膜层从边缘到中心平均分成透光率依次升高的若干等份。在一种优选的实施方式中，所述若干等份大于或者等于10等份。
为了使屏前出光均匀性达到95％以上，最靠近中心的等份的透光率不低于90％，最靠近边缘的等份的透光率不低于99％。
一个具体的实例如图7所示，以L4镜片207的1/4截面图为说明，将其一侧增透膜层2072由B1～B11各点平均分成的10等份，其中O点为L4镜片207的中心对称点，A1为OB1的中点，B2B1是最边缘的区域，B11B10为透镜中心区域。通过将L4透镜207的表面镀成不同透光率的增透膜，以B11B10段至B2B1段的光透过率依次升高以匹配屏幕增益关系，其中B11B10穿透率不低于90％，B2B1穿透率不低于99％。下面结合两种主流屏幕尺寸的屏幕为例对本发明的技术方案进行进一步的说明。
目前拼接墙用DLP显示单元的投影机主流分辨率为1080P、SXGA+和XGA，即屏幕尺寸长宽比有16:9对应投影机的1080P，尺寸比4:3对应投影机的SXGA+与XGA。以16:9-GUCS(Glass Ultra Contrast Screen)幕为例，其增益归一化数值表(以中心点5为基准1，其他各点增益除以中心点增益得到)如图8所示，增益大小以中心点向画面四周逐渐降低，角落四点10、11、12、13的值跌到0.9左右，画面边缘增益也在这个水平，因此，L4透镜207的镀膜情况从中心到边缘的穿透率大小应为0.9至0.99逐渐升高，即镀膜穿透率可以设置为：B11B10为90％、B10B9为91％、B9B8为92％、B8B7为93％、B7B6为94％、B6B5为95％、B5B4为96％、B4B3为97％、B3B2为98％和B2B1为99％，那么画面边缘暗点的亮度值与中心点亮度理论值之比为：(0.9*99％/1*0.9)*100％＝99％≥95％，这样投影机与屏幕匹配出来后屏前的亮度均匀性指标基本在95％以上，即中心点与边缘角落亮度之差在5％之内，拼墙后显示单元之间的拼缝处就不会存在暗边暗角问题了。
以另外一种主流屏幕尺寸长宽比4:3-GUCS(Glass Ultra Contrast Screen)幕为例，其增益归一化数值表(以中心点5为基准1，其他各点增益除以中心点增益得到)如图9所示，增益大小以中心点向画面四周逐渐降低，角落四点10、11、12、13的值跌到0.92左右，画 面边缘增益也在这个水平，较16:9屏幕稍好一点，L4透镜207的镀膜情况从中心到边缘的穿透率大小应为0.92至0.99逐渐升高，即镀膜穿透率可以设置为：B11B10为92％、B10B9为92.8％、B9B8为93.6％、B8B7为94.4％、B7B6为95.2％、B6B5为96％、B5B4为96.8％、B4B39为97.6、B3B29为98.4％和B2B1为99％，那么画面边缘暗点的亮度值与中心点亮度理论值之比为：(0.92*99％/1*0.92)*100％＝99％≥95％，这样投影机与屏幕匹配出来后屏前的亮度均匀性指标基本在95％以上，即中心点与边缘角落亮度之差在5％之内，拼墙后显示单元之间的拼缝处就不会存在暗边暗角问题了。
相同或相似的标号对应相同或相似的部件；
附图中描述位置关系的用于仅用于示例性说明，不能理解为对本专利的限制；
显然，本发明的上述实施例仅仅是为清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。

Claims (4)

  1. 一种DLP背投拼接投影系统，包括合光模组、聚光镜、积分棒、L1镜片、L2镜片、L3镜片、L4镜片、全反射棱镜、数字微反射镜、投影镜头，合光模组发出的光依次经过聚光镜、积分棒、L1镜片、L2镜片、L3镜片、L4镜片、全反射棱镜进入数字微反射镜，投影镜头发出的光经过全反射棱镜后进入数字微反射镜，其特征在于，所述L4镜片为凸透镜，其包括里层玻璃和设于里层玻璃两侧球面的增透膜层，两侧增透膜层的透光率对称地从中心到边缘依次升高。
  2. 根据权利要求1所述的DLP背投拼接投影系统，其特征在于，将两侧增透膜层分别以中心对称点为中心等分为四份，每份增透膜层从中心到边缘平均分成透光率依次升高的若干等份。
  3. 根据权利要求2所述的DLP背投拼接投影系统，其特征在于，若干等份中，最靠近中心的等份的透光率不低于90％，最靠近边缘的等份的透光率不低于99％。
  4. 根据权利要求2或3所述的DLP背投拼接投影系统，其特征在于，所述若干等份大于或等于10等份。
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