WO2005008617A1 - Dispositif d'affichage couleur par projection - Google Patents

Dispositif d'affichage couleur par projection Download PDF

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Publication number
WO2005008617A1
WO2005008617A1 PCT/CN2004/000110 CN2004000110W WO2005008617A1 WO 2005008617 A1 WO2005008617 A1 WO 2005008617A1 CN 2004000110 W CN2004000110 W CN 2004000110W WO 2005008617 A1 WO2005008617 A1 WO 2005008617A1
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WO
WIPO (PCT)
Prior art keywords
display device
micro
color
polarized light
linearly polarized
Prior art date
Application number
PCT/CN2004/000110
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English (en)
French (fr)
Inventor
Jianx SHAO
Bin Fan
Original Assignee
Kinoptics Technologies Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kinoptics Technologies Inc. filed Critical Kinoptics Technologies Inc.
Priority to US10/506,304 priority Critical patent/US7690796B2/en
Priority to EP04709567A priority patent/EP1647963A4/en
Priority to JP2006519746A priority patent/JP2007524111A/ja
Publication of WO2005008617A1 publication Critical patent/WO2005008617A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G02B27/285—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining comprising arrays of elements, e.g. microprisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/356—Image reproducers having separate monoscopic and stereoscopic modes
    • H04N13/359—Switching between monoscopic and stereoscopic modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Definitions

  • the present invention relates to a color projection display device, and particularly to a three-dimensional / two-dimensional switchable color projection display device.
  • An object of the present invention is to provide a three-dimensional color projection display device, which has the characteristics of simple structure, low optical efficiency, and low cost.
  • a further object of the present invention is to provide a two-dimensional and six-primary-color color projection display device, which has higher optical efficiency and can provide richer, vivid, and realistic display colors, thereby improving image quality.
  • a further object of the present invention is to provide a three-dimensional three-dimensional color projection display and two-dimensional six primary colors.
  • the color projection display device of the present invention comprises a polarization beam splitting prism group, two silicon-based liquid crystal reflective color micro display chips, and a projection objective lens.
  • the silicon-based liquid crystal reflective color micro display chip is provided with a micro color filter array.
  • the polarization beam splitting prism group divides the incident illumination light into first linearly polarized light and second linearly polarized light whose polarization directions are perpendicular to each other, and causes them to exit from different positions thereof.
  • the micro display chips are respectively located at the exit positions of the first linearly polarized light and the second linearly polarized light, and the two linearly polarized lights are respectively modulated according to the respective image information inputted therein, and the modulated first
  • the three linearly polarized light and the fourth linearly polarized light are reflected back into the polarization beam splitting prism group, wherein the polarization directions of the third linearly polarized light and the fourth linearly polarized light are respectively relative to the polarizations of the first linearly polarized light and the second linearly polarized light
  • the direction was rotated 90 degrees.
  • the polarization beam splitting prism group is further configured to receive the third linearly polarized light and the fourth linearly polarized light from the micro display chip, and combine the two beams into an imaging beam and project it onto a projection objective lens.
  • the projection objective lens is used for receiving and projecting an imaging beam from the polarization beam splitting prism group.
  • the color projection display device of the present invention can implement three-dimensional color projection display.
  • the input images of the two micro display chips are the same, two-dimensional color projection display can be realized; and the micro color separation filter arrays of the micro display chips can have the same or different primary colors.
  • two micro-dichroic filter arrays each have three different primary colors, a two-dimensional and six-primary projection display can be realized.
  • the polarization beam splitting prism group used in the color projection display device of the present invention may have multiple constitutions.
  • it may be composed of a single conventional polarization beam splitting prism, or it may be a right angle prism coated with a polarization beam splitting film on four right angle surfaces. It is formed by arranging and combining in an "X" shape, or it can also be made by arranging and combining four conventional polarization beam splitting prisms in a "meter" shape.
  • the upper quarter-wave plate can further improve the contrast of the image, thereby improving the image quality.
  • FIG. 1 is a schematic diagram of a three-dimensional / two-dimensional switchable color projection display device of the present invention
  • FIG. 2 is a schematic diagram of an embodiment of the present invention
  • FIG. 3 is a schematic diagram of another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of another embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a three-dimensional / two-dimensional switchable color projection display device of the present invention.
  • the color projection display device includes a polarization beam splitter prism 1, two silicon-based liquid crystal reflective color micro display chips 2 and 3, and a projection objective lens 4.
  • the silicon-based liquid crystal reflective color micro-display chips 2 and 3 may be, for example, the silicon-based liquid crystal reflective color micro-display chips with micro color separation optical filters described in Chinese Patent Nos. 01113471.2 and No. 02217356.0.
  • the micro display chips 2 and 3 are respectively placed on two adjacent faces of the polarization beam splitting prism 1, and stereo image information corresponding to different viewing angles can be input respectively.
  • the white natural light 5 for irradiation When the white natural light 5 for irradiation is incident on the polarization beam splitting prism 1, the light is reflected and refracted at the polarization beam splitting film, and thus is divided into two beams of linearly polarized light 6 and p-polarized light that are orthogonal to each other.
  • Light 7 is irradiated on the silicon-based liquid crystal reflective color micro display chips 3 and 2, respectively.
  • the linearly polarized light incident on the color micro display chips 2 and 3 After the linearly polarized light incident on the color micro display chips 2 and 3 is modulated by the chip, part of the linearly polarized light with color image information is reflected, and its polarization direction is changed by 90 °, thereby obtaining linearly polarized light 8 and sdirectional linearly polarized light 9.
  • the light rays 8 and 9 pass through the polarization beam splitting prism 1 again, and are synthesized into a light beam 10, and then are magnified and imaged by the projection objective 4 for projection display. In this way, part of the light of the projected image comes from the p-polarized light image on the micro display chip 3, and part of the light comes from the s-polarized light image on the micro display chip 2.
  • the viewer wears polarizers with polarizing directions perpendicular to each other, that is, s and p light polarizers. Then the viewer's two eyes can only see the s-polarized light image and the p-polarized light image, respectively.
  • the viewer's two eyes can see images of different viewing angles, so that stereoscopic vision can be formed. .
  • the relative position of the two color micro display chips can be adjusted by a position adjustment mechanism (not shown), so that The projected images of the corresponding pixels are completely coincident.
  • the position of the micro display chip can also be fixed without adjustment, and it has been ensured that the projected images of the corresponding pixels of the two chips can be overlapped during the initial assembly.
  • the viewer can view the two-dimensional plane display image without wearing glasses. Since the projection display device does not require a pre-polarizing device, light of different polarizations is used, so the optical efficiency of the system can be effectively improved.
  • the use of two silicon-based liquid crystal reflective color micro display chips can enrich the gradation of displayed colors, especially when the two silicon-based liquid crystal reflective color micro display chips have micro color separation filters.
  • the array has different primary colors.
  • one of the micro display chips has a micro color filter array of three primary colors of red, green, and blue
  • the other micro display chip has a micro color filter array of three primary colors of cyan, yellow, and magenta.
  • It can constitute a six-primary color display system, so that the displayed image has a wider chromaticity range, and can display richer, more vivid, and more realistic colors.
  • the color projection display device of the present invention can realize color three-dimensional display, and has a simple structure, so the cost is low, and since light of all polarization directions of incident natural light is used, it has high optical efficiency.
  • the projection display device of the present invention can also be used for two-dimensional flat display. At this time, the system has higher optical efficiency than the conventional display system using a pre-polarizer, and can realize six-primary color display to make colors richer. The images are more vivid.
  • Another important advantage of the color projection display device of the present invention is that by controlling the image information input to the silicon-based liquid crystal reflective color micro display chip, it can correspond to different viewing angles or the same viewing angle, and can be in a two-dimensional plane.
  • the display and three-dimensional stereo display can be conveniently switched freely, thereby making the device more flexible in use and more versatile. Except for a part of the illumination light projected on the silicon-based liquid crystal reflective color micro-display chips 2 and 3, which is modulated by the chip and changes its polarization direction for projection display, the rest (including micro-dichroic filters) The light reflected back by the array, and the light whose polarization direction has not been changed by the liquid crystal) is reflected back to the lighting system according to the original optical path because the polarization direction has not been changed. Through a certain device, this part of the light can be reflected back and reused. Thereby, the utilization efficiency of light can be effectively improved (see Chinese Patent Application 02217355.2), and the brightness of the projection display image can be improved.
  • the extinction ratios of transmitted light and reflected light are different, and the extinction ratios are both low, which cannot guarantee good image contrast.
  • the extinction ratio of its transmitted light (which can be greater than 1000: 1) is much larger than the extinction ratio of its reflected light (about tens to one). Therefore, for the specific implementation of the present invention, the contrast of the projected image of the device shown in FIG. 1 will be low, and further improvement is needed.
  • Fig. 2 shows an improved embodiment of a three-dimensional / two-dimensional switchable color projection display device according to the present invention.
  • the polarization splitting prism group 11 is formed by combining four right-angle prisms each coated with a polarization splitting film a on a right-angle surface in an X shape.
  • Two silicon-based liquid crystal reflective color microdisplay chips 2 and 3 with micro-dichroic filter arrays are located at the exit positions of the linearly polarized light in the p-direction and s-direction of the polarization beam splitting prism group 11, respectively, parallel to the prism Placed on the surface, as shown in Figure 2.
  • the imaging light incident on the micro display chip and reflected from the micro display chip both pass through the polarization beam splitting film (two consecutive reflections or two consecutive transmissions), the extinction ratio is greatly improved. This effectively improves the contrast of the projected image and improves the image quality.
  • Fig. 3 is a schematic diagram of another embodiment of the present invention.
  • Its polarization beam splitting prism group 11 is a combination of four conventional polarization beam splitting prisms 12 arranged in a "meter" shape. Its working principle is exactly the same as the polarizing beam splitting prism group arranged in an "X" arrangement as shown in Figure 2. Its advantage lies in the use of conventional commercial polarization beam splitting prisms, which is conducive to reducing costs and large-scale production.
  • FIG. 4 is a schematic diagram of another embodiment of the device shown in FIG. 3 after being improved.
  • Polarizing beamsplitter The lens group 11 is still formed by combining four conventional polarization beam splitting prisms 12 in a "meter" arrangement. The difference from FIG. 3 is that a piece of two is inserted between the interfaces where the polarization beam splitting prisms 12 are combined.
  • Fractional wave plate 13 The half-wave plate 13 can rotate the polarization direction of the linearly polarized light by 90 °, that is, the s-polarized light can be converted into p-polarized light, or the p-polarized light can be converted into s-polarized light. In this way, as shown in FIG.
  • each of the imaging light incident on the micro display chip and reflected from the micro display chip passes through the polarization beam splitting film twice, and one of the two times is transmitted and the other is reflected, which can make
  • the two imaging beams are basically balanced, and the extinction ratios of the two imaging beams are very close, so that the overall extinction ratio of the synthesized projection beam is optimal, thereby improving image contrast and improving image quality.
  • a quarter-wave plate can be pasted on the front surface of the silicon-based liquid crystal reflective color micro-display chip to effectively solve the problem of the decrease in contrast caused by a certain angle of taper light incident (see US patent US 5,327,270).
  • a color stereo display can be conveniently, simply, and low-costly realized. Can realize multi-primary color display. It is convenient to switch freely between the color 3D stereo display mode and the 2D multi-primary color display mode.

Description

一种彩色投影显示装置
抟术领域
本发明涉及彩色投影显示装置， 特别是一种三维 /二维可切换的彩色投影显示装 置。
技术背景
近年来， 针对高清晰度电视（HDTV) 的应用， 发展起了许多新型的显示技术， 如： 等离子体显示（PDP)技术、 薄膜晶体管 （TFT) 显示技术、 数字微反射镜显示 (DMD)技术、以及硅基液晶反射式（LCOS)显示技术等等。中国专利 No.01113471.2 和 No.02217356.0提出了一种单芯片彩色显示的新方案， 其中， 将 LCOS技术与光学 薄膜微滤光片技术结合在一起，组成彩色 LCOS器件，该器件具有分辨率高、成本低、 光学效率高、 图像质量好、 容易实现大规模生产等优点， 有望成为下一代的主流显示 技术。
但上述这显示技术均为平面显示技术， 不具有三维立体视觉效果。对显示技术发 展的进一步要求是研制出具有立体视觉的显示装置来。 为此， 世界上有许多科研人员 对此开展了研究。 如， 美国专利 6,351,280提出了在液晶显示板的表面贴上微偏振片 条， 观看者带上用偏振片制作的眼镜， 可使左右眼看到不同的图像， 而形成立体视觉 的方法。 但至今为止， 这些立体显示技术都较复杂， 实用性不强。
发明内容
本发明的目的在于提供一种三维彩色投影显示装置， 它具有结构简单、 光学效率 髙、 成本低等特点。
本发明进一步的目的在于提供一种二维六基色的彩色投影显示装置， 它具有更高 的光学效率， 并能够提供更丰富、 生动、 逼真的显示颜色， 从而提高图像质量。
本发明更进一步的目的在于提供一种可在三维立体彩色投影显示和二维六基色
确认本 彩色投影显示之间互相切换的显示装置。
本发明的上述目的通过如下技术方案来实现：
本发明的彩色投影显示装置包括偏振分光棱镜组、两片硅基液晶反射式彩色微显 示芯片和投影物镜。其中， 所述硅基液晶反射式彩色微显示芯片带有微型分色滤光镜 列阵。所述偏振分光棱镜组将入射的照明光分成偏振方向相互垂直的第一线偏振光和 第二线偏振光， 并使之从其不同位置出射。 所述微显示芯片分别位于所述第一线偏 振光和第二线偏振光的出射位置处，根据输入其中的各自的图像信息分别对所述两束 线偏振光进行调制， 并将调制得到的第三线偏振光和第四线偏振光反射回所述偏振分 光棱镜组中，其中所述第三线偏振光和第四线偏振光的偏振方向分别相对于第一线偏 振光和第二线偏振光的偏振方向旋转了 90度。 所述偏振分光棱镜组还用于从所述微 显示芯片接收所述第三线偏振光和第四线偏振光， 并将两束光合成为一束成像光束并 投射到投影物镜上。所述投影物镜用于接收来自所述偏振分光棱镜组的成像光束， 并 将之投影成像。
当所述两片微显示芯片的输入图像对应不同视角时， 上述本发明的彩色投影显示 装置可以实现三维彩色投影显示。 当所述两片微显示芯片的输入图像相同， 则可以实 现二维彩色投影显示； 并且所述微显示芯片的微型分色滤光片列阵可以具有相同或者 不同的基色。 当两片微型分色滤光片列阵分别具有三种各不相同的基色时， 就可以实 现二维六基色投影显示。
本发明的彩色投影显示装置中所使用的偏振分光棱镜组可以是有多种构成方式， 例如， 可以由单个常规的偏振分光棱镜构成， 或者可以由四个直角面镀有偏振分光膜 的直角棱镜按 "X"形状排列结合而成， 或者也可以由四个常规偏振分光棱镜按 "米" 字形排列结合而成。
另外， 通过在偏振分光棱镜之间插入二分之一波片， 或者在微显示芯片表面上贴 上四分之一波片还可以进一步提高图像的对比度， 从而改善像质。
附图说明
图 1为本发明的三维 /二维可切换彩色投影显示装置的原理示意图；
图 2为本发明的一个实施例的示意图；
图 3为本发明另一个实施例的示意图；
图 4为本发明另一个实施例的示意图。
具体实施方式
下面结合附图详细阐述本发明， 但并不限制本发明的内容。
图 1是本发明的三维 /二维可切换的彩色投影显示装置的原理示意图。该彩色投影 显示装置包括偏振分光棱镜 1、 两片硅基液晶反射式彩色微显示芯片 2和 3以及投影 物镜 4。 硅基液晶反射式彩色微显示芯片 2和 3例如可以是中国专利 No.01113471.2 和 No.02217356.0中所描述的带有微型分色光学滤光片的硅基液晶反射式彩色微显示 芯片。微显示芯片 2和 3分别置于偏振分光棱镜 1的两个相邻面上， 可以分别输入相 应于不同视角的立体图像信息。
当用于照射的白色自然光 5入射到偏振分光棱镜 1上时，光在偏振分光膜处发生 反射和折射， 从而被分成两束偏振方向互相正交的 s方向线偏振光 6和 p方向线偏振 光 7， 分别照射到硅基液晶反射式彩色微显示芯片 3和 2上。 入射到彩色微显示芯片 2、 3上的线偏振片光被该芯片调制后， 部分带有彩色图像信息的线偏振光被反射，其 偏振方向转变 90°， 从而获得 p方向线偏振光 8和 s方向线偏振光 9。 光线 8和 9再 次通过偏振分光棱镜 1，并被其合成为一束光线 10后，用投影物镜 4放大成像后作投 影显示用。这样， 投影图像的一部分光是来自微显示芯片 3上的 p偏振光图像， 而另 一部分光是来自微显示芯片 2上的 s偏振光图像。
如果观看者带上用偏振方向相互垂直的偏振片， 即 s和 p光偏振片制作的眼镜， 则观看者的两只眼睛就分别只能看到 s偏振光图像和 p偏振光图像。 在两片硅基液晶 反射式彩色微显示芯片 2和 3输入的是对应于不同视角的立体图像信息的情况下，观 看者的两只眼睛就可以看到不同视角的图像， 从而可以形成立体视觉。
当两片硅基液晶反射式彩色微显示芯片 2和 3上的图像信息完全相同的时候，可 以通过位置调节机构（未示出）来调整两片彩色微显示芯片的相对位置， 使得两芯片 的对应象素的投影图像完全重合。 当然， 微显示芯片的位置也可以实现为固定而不需 要调节的， 在最初组装时已经保证了两芯片的对应象素的投影图像能够重合。 此时， 观看者不必带眼镜就可观看到该二维平面显示图像。 由于该投影显示装置不需要预起 偏器件， 不同偏振的光都得到了利用， 因而可以有效地提高系统的光学效率。 另外， 采用两片硅基液晶反射式彩色微显示芯片， 可以使显示的色彩的色阶灰度更丰富， 特 别是当这两片硅基液晶反射式彩色微显示芯片的微型分色滤光片列阵具有不同基色 时。 例如， 当其中一片微显示芯片具有红、 绿、 蓝三基色的微型分色滤光片列阵， 而 另一片微显示芯片具有青、黄、 品红三基色的微型分色滤光片列阵， 则可以构成一个 六基色的彩色显示系统， 使显示的图像具有更宽的色度范围， 可以呈现出更丰富、 更 生动、 更逼真的色彩来。
本发明的彩色投影显示装置能够实现彩色三维显示，其结构简单，因而成本较低， 并且由于入射的自然光的所有偏振方向的光都得到了利用， 所以具有较高的光学效 率。 本发明的投影显示装置也可以用于二维平面显示， 此时， 其系统具有比传统的使 用预起偏器的显示系统更高的光学效率， 并且可以实现六基色彩色显示， 使色彩更丰 富、 图像更生动。 本发明的彩色投影显示装置的另一个重要优点是通过控制输入到硅 基液晶反射式彩色微显示芯片上的图像信息，使之对应于不同的视角或者对应于相同 的视角， 可以在二维平面显示和三维立体显示间方便地自由切换， 从而使该装置的使 用更灵活、 用途更广泛。 投射到硅基液晶反射式彩色微显示芯片 2和 3上的照明光， 除一部分被该芯片调 制后改变了其偏振方向， 去作投影显示用外， 其余部分（包括被微型分色滤光片列阵 反射回去的光， 和没有被液晶改变偏振方向的光）因没有改变偏振方向， 而被按原光 路反射回照明系统， 通过一定的装置可以将该部分光再次反射回来， 加以重复利用， 从而可有效地提高光的利用效率 （参见中国专利申请 02217355.2)， 提髙投影显示图 像的亮度。
对于现有的常规偏振分光膜， 其透射光和反射光的消光比是不同的， 并且消光比 都较低，不能保证良好的图像对比度。例如，通常其透射光的消光比（可大于 1000:1 ) 远远大于其反射光的消光比（约几十比一)。 因此， 对于本发明的具体实施来说， 图 1 所示的装置， 其投影出的图像的对比度会较低， 需要作进一步的改善。
图 2示出了根据本发明的三维 /二维可切换彩色投影显示装置的一个改进了的实 施例。 其中， 偏振分光棱镜组 11是由四个分别在直角面镀有偏振分光膜 a的直角棱 镜按 X形状结合而成的。两片带有微型分色滤光片列阵的硅基液晶反射式彩色微显示 芯片 2和 3分别位于该偏振分光棱镜组 11的 p方向和 s方向线偏振光的出口位置处， 平行于棱镜表面而放置, 如图 2所示。在该实施例中， 由于入射到微显示芯片上以及 从微显示芯片反射的成像光线均分别两次经过了偏振分光膜 (连续两次反射或者连续 两次透射）， 因而大大提高了消光比， 从而有效地提高了投影图像的对比度， 改善了 像质。
图 3是本发明的另一个实施例的示意图。 它的偏振分光棱镜组 11是一个由四个 常规的偏振分光棱镜 12按 "米"字型排列结合而成的。 它的工作原理与图 2所示的 按 "X"状排列结合而成的偏振分光棱镜组完全相同。 其好处在于采用常规的商品偏 振分光棱镜， 有利于降低成本和规模化生产。
图 4是对图 3所示的装置进行改进后的又一个实施例的示意图。它的偏振分光棱 镜组 11仍是由四个常规的偏振分光棱镜 12按 "米"字型排列结合而成的， 与图 3的 不同之处是在各偏振分光棱镜 12相结合的交界面之间插入一片二分之一波片 13。 二 分之一波片 13可以使得线偏振光的偏振方向旋转 90°， 即， 可以使 s偏振光转换成 p 偏振光， 或者使 p偏振光转换成 s偏振光。 这样， 如图 4所示， 每一路入射到微显示 芯片上以及从微显示芯片反射的成像光均分别两次经过了偏振分光膜， 并且两次中一 次为透射、 一次为反射， 这可使得两路成像光束基本平衡， 并且两路成像光束的消光 比非常接近， 使合成后的投影光束总体上的消光比达到最佳， 从而提高图像对比度， 改善像质。
另外， 还可以通过在硅基液晶反射式彩色微显示芯片的前表面上贴上四分之一波 片， 来有效地解决在有一定锥度角光线入射时引起的对比度下降的问题（参见美国专 利 US5，327，270)。
本发明具有如下有益效果： 可以方便、 简单、 低成本地实现彩色立体显示。 可以 实现多基色的彩色显示。可以方便地在彩色三维立体显示模式和二维多基色的彩色显 示模式间自由切换。
以上结合附图详细描述了根据本发明优选实施例的装置及其方法。然而， 本领域 技术人员很清楚， 在不背离本发明的精神和范围的情况下， 能对其做出各种修改和变 化。 因此， 对实施例的详细说明和附图应被视为说明性的而不是限制性的。 本发明的 范围应由后附的权利要求书来限定。

Claims

权利要求书
1. 一种彩色投影显示装置， 包括偏振分光棱镜组、 两片硅基液晶反射式彩色微 显示芯片和投影物镜， 其中：
所述硅基液晶反射式彩色微显示芯片带有微型分色滤光镜列阵；
所述偏振分光棱镜组将入射的照明光分成偏振方向相互垂直的第一线偏振光和第 二线偏振光， 并使之从其不同位置出射；
所述微显示芯片分别位于所述第一线偏振光和第二线偏振光的出射位置处， 根据 输入其中的各自的图像信息分别对所述两束线偏振光进行调制， 并将调制得到的第三 线偏振光和第四线偏振光反射回所述偏振分光棱镜组中， 其中所述第三线偏振光和第 四线偏振光的偏振方向分别相对于第一线偏振光和第二线偏振光的偏振方向旋转了 90 度；
所述偏振分光棱镜组还用于从所述微显示芯片接收所述第三线偏振光和第四线偏 振光， 并将两束光合成为一束成像光束并投射到投影物镜上;
所述投影物镜用于接收来自所述偏振分光棱镜组的成像光束， 并将之投影成像。
2. 如权利要求 1所述的彩色投影显示装置， 其特征在于， 所述偏振分光棱镜组 是由四个在其直角面上镀有偏振分光膜的直角棱镜按 "X"形状排列结合而成的。
3. 如权利要求 1所述的彩色投影显示装置， 其特征在于， 所述偏振分光棱镜组 是由四个偏振分光棱镜按 "米"字形排列结合而成的。
4. 如权利要求 3所述的彩色投影显示装置， 其特征在于， 在所述偏振分光棱镜 组中的各偏振分光棱镜的至少部分结合面之间插入二分之一波片。
5. 如权利要求 1所述的彩色投影显示装置， 其特征在于， 所述微显示芯片的表 面上贴有四分之一波片。
6. 如权利要求 1-5 中任一项所述的彩色投影显示装置， 其特征在于， 所述两片 微显示芯片具有基色相同的微型分色滤光片列阵。
7. 如权利要求 1-5 中任一项所述的彩色投影显示装置， 其特征在于， 所述两片 微显示芯片具有基色不相同的微型分色滤光片列阵。
8. 如权利要求 7所述的彩色投影显示装置， 其特征在于， 其中一片微显示芯片 的微型分色滤光片列阵的基色为红、 绿、 蓝， 另一片微显示芯片的微型分色滤光片列 阵的基色为青、 黄、 品红。
9. 如权利要求 1所述的彩色投影显示装置， 其特征在于， 当所述显示装置用于 立体投影显示时， 所述输入到两片微显示芯片的图像信息是对应于不同视角的； 而当 所述显示装置用于平面投影显示时， 所述输入到两片微显示芯片的图像信息是对应于 相同视角的。
10. 如权利要求 9所述的彩色投影显示装置， 其特征在于所述显示装置还包括位 置调节机构， 用于当所述显示装置用于平面投影显示时， 调节所述两片微显示芯片的 位置以使得所述微显示芯片的对应象素的成像位置重合。
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CN100476505C (zh) 2009-04-08
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