WO2009059446A1 - Affichage-loupe - Google Patents

Affichage-loupe Download PDF

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Publication number
WO2009059446A1
WO2009059446A1 PCT/CN2007/003122 CN2007003122W WO2009059446A1 WO 2009059446 A1 WO2009059446 A1 WO 2009059446A1 CN 2007003122 W CN2007003122 W CN 2007003122W WO 2009059446 A1 WO2009059446 A1 WO 2009059446A1
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WO
WIPO (PCT)
Prior art keywords
light
lens
display device
conducting plate
degrees
Prior art date
Application number
PCT/CN2007/003122
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English (en)
French (fr)
Inventor
Yunliang Chen
Tiecai Li
Original Assignee
Shenzhen Academy Of Aerospace Technology
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.)
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Publication date
Application filed by Shenzhen Academy Of Aerospace Technology filed Critical Shenzhen Academy Of Aerospace Technology
Priority to CN2007800524202A priority Critical patent/CN101646970B/zh
Priority to PCT/CN2007/003122 priority patent/WO2009059446A1/zh
Publication of WO2009059446A1 publication Critical patent/WO2009059446A1/zh

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Classifications

    • 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
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • 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
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
    • G02B2027/0116—Head-up displays characterised by optical features comprising device for genereting colour display comprising devices for correcting chromatic aberration

Definitions

  • the present invention relates to an optical imaging system and to an spectacles-type display device having a large field of view and a large exit pupil size. Background technique
  • the function of the glasses display device is to magnify the image generated by the micro display chip (such as LCD, LCOS or OLED) into a virtual image for viewing by the human eye, wherein LCD (Liquid Crystal Display) is liquid crystal display, OLED (Organic Light Emitting) Diode) is an organic light emitting diode, and LCOS (Liguid Crystal on Silicon) is a reflective silicon-based liquid crystal.
  • LCD Liquid Crystal Display
  • OLED Organic Light Emitting
  • LCOS Liguid Crystal on Silicon
  • the entire display device is worn in a position very close to the human eye, and has the advantages of portability, mobility, and the like.
  • the glasses-type display device is required to have a small volume and a light weight as much as possible while ensuring sufficient image quality and sufficient visual magnification. '
  • the glasses-type display device can be used not only in the military field to meet the needs of real-time observation of images, but also widely used in the field of civilian multimedia audio-visual. Due to its wide market application prospects, many research institutes and companies have invested heavily in eyeglass display technology, and various eyeglass display technology solutions have emerged.
  • a display system that magnifies an image using an off-axis free-form prism is provided in U.S. Patent Nos. 6,028,708, 6,097,354, 5,436,765, 5,959,780, and 6,317,267.
  • the holographic optical device and the light-conducting flat plate are employed in the US Patent No. 09/801,405 (publication No. US 2001/0033401 A1) and US Pat. No. 6,169,613, so that the entire eyeglass type display device can be made thinner and lighter, but the holographic optical element is difficult to batch. And its color difference is difficult to eliminate, these shortcomings limit the promotion and application of such programs.
  • the present invention solves the problem that the size and weight must be increased when the field of view and the exit pupil size are increased in the conventional glasses type display device, and provides a larger field of view and larger ⁇ size and support high-resolution thin and light glasses display device.
  • the present invention adopts the following technical solution: constructing a glasses type display device, comprising a micro display chip, an optical lens group for amplifying an image generated by the micro display chip, and the optical lens
  • the light outputted by the group is transmitted to the light-conducting plate of the human eye; wherein, the micro-display chip, the optical lens group and the light-conducting plate are sequentially placed along the light propagation direction; the light-conducting plate and the observation axis of the human eye Vertically, the angle between the axis of the optical lens group and the viewing axis of the human eye is 45 degrees to 65 degrees.
  • the optical lens group may include four lenses sequentially placed along the direction of light propagation, wherein the first lens, the second lens, and the third lens are used to focus the light beam and eliminate chromatic aberration, and the fourth lens is used for the fourth lens.
  • the principal ray is deflected to be perpendicular to the microdisplay chip and the distortion is eliminated.
  • the first, third, and fourth lenses are preferably even aspherical convex lenses, and the second lens is a spherical biconcave lens.
  • the first, third, and fourth lenses may be made of PMMA, COC or COP resin materials, and the resin material has a refractive index of 1.45 to 1.6 and an Abbe number of 56 to 58;
  • the lens may be made of a flint glass material having a refractive index of 1.7 to 1.9 and an Abbe number of 20 to 40.
  • the micro display chip and the distance between the first lens may be a 3mm ⁇ 10mm; the micro display chip and the total length between the fourth lens is less than 50mm; observation of the eye to a light-conducting
  • the distance between the plates can be 10mm ⁇ 25mm.
  • the light-conducting plate is an optical plate in which a plurality of partial reflecting surfaces are combined, and the thickness thereof is 2mn! ⁇ 3 dishes; the angle between each of the partial reflection surfaces and the bottom surface of the light-conducting plate is 25 degrees to 45 degrees, and the reflectance of each of the partial reflection surfaces is 20% to 30%.
  • the glasses type display device of the present invention has a size of 15 mm X 8 mm and a half field of view of 15 degrees X 9 degrees.
  • the image generated by the micro display chip is amplified by the optical lens group, and then the enlarged image is transmitted to the human eye by the light conducting plate for observation by the human eye.
  • the optically conductive plate can expand the size of the crucible. Since the light-conducting plate is very thin, the entire display device has the characteristics of large field of view, large exit pupil size and large eye point distance; at the same time, each lens in the optical lens group has low processing difficulty. The production cost and reliability are guaranteed.
  • FIG. 1 is a schematic structural view of a glasses type display device in a preferred embodiment of the present invention
  • FIG. 2 is a schematic structural view of the optical lens unit shown in FIG.
  • Figure 3 is a working principle diagram of the light-conducting plate shown in Figure 1;
  • Figure 4 is a schematic view showing the operation of the optical lens unit shown in Figure 2;
  • 5a and 5b are image quality analysis diagrams of the glasses type display device shown in Fig. 2.
  • 1 is a micro display chip
  • 2 is a lens group
  • 21, 22, 23, 24 are first, second, third, and fourth lenses, respectively
  • 3 is a light-conducting plate (referred to as a light guide plate)
  • 4 is a human eye
  • 5 It is the axis of the human eye
  • 6 is the axis of the lens group
  • 7 is the incident light
  • 8 is the partial reflection surface.
  • the structure of the glasses type display device is as shown in Figs. 1 and 2. Shown in FIG. 1 is the overall structure of the optical lens group 2, and FIG. 2 shows that the optical lens group 2 is specifically composed of four lenses.
  • the distance between the micro display chip 1 and the first lens 21 can be 3 mm to 10 mm, which is 5 mm in this embodiment; the total length between the microdisplay chip and the fourth lens 24 is less than 50 mm, which is 49 mm in this embodiment; the distance between the observation position of the human eye 4 and the light-conducting plate 3 is 10mn! ⁇ 25mm, 15mm in this embodiment.
  • the thickness of the light-conducting plate is 3 mm, and can be further reduced to 2 mm.
  • the eyeglass display device has a size of 15 mm X 8 mm and a half field of view of 15 degrees X 9 degrees.
  • the light conducting plate 3 is perpendicular to the viewing axis 5 of the human eye, and the angle between the axis of the optical lens group 2 and the viewing axis 5 of the human eye is 45 degrees to 65 degrees.
  • 3 shows the transmission effect of the light-conducting plate 3 on light, which is an optical plate in which a plurality of partial reflection surfaces are combined; an angle between each of the partial reflection surfaces and the bottom surface of the light-conducting plate is 25 Degree ⁇ 45 degrees, the reflectivity of each partial reflection surface is 20% ⁇ 30 ° /. .
  • Each of the partial reflecting surfaces 8 functions to partially reflect the light beam incident thereon. Specifically, for any one of the partial reflection surfaces 8 of the light-conducting plate, the partially reflected light of the incident light 7 is perpendicular to the surface of the light-conducting plate, does not satisfy the total reflection condition, and is coupled out of the conduction plate 3, and is irradiated to the human eye 4 The transmitted light continues to travel in the light-conducting plate to the next partially reflective surface due to total reflection.
  • the partial reflecting surfaces 8 are arranged in a horizontal array, so that the reflected light is also repeatedly arranged in the horizontal direction. That is, the width of the incident beam 7 is expanded in the horizontal direction.
  • the light-conducting plate can greatly expand the observable range of the beam, thereby transmitting the virtual image of the lens group to the human eye and simultaneously expanding the observable range.
  • the light-conducting plate can be made of colorless optical glass or optical resin glass.
  • k9 glass is used, and the k9 glass is ground into a parallelogram shape with an acute angle of 30 degrees, and a partially reflective aluminum film is vapor-deposited thereon and bonded.
  • the optical system adopts a reverse design, that is, the light is emitted by the human eye (left), transmitted through the light-conducting plate, and then sequentially passes through the first lens 21, the second lens 22, and the third.
  • the lens 23 and the fourth lens 24 are finally imaged on the plane of the microdisplay chip 1. Because the parallel beam is at The transmission in the light-conducting plate does not produce any aberrations, so it can be considered as a parallel plate in the design, which is not shown in Fig. 4.
  • the aperture stop is placed at the human eye (left), the size is set to 60 mm ⁇ 8 mni ; and an additional aperture is placed at 8.1 mm to the left of the first lens 21 to limit the aperture size of the beam in the horizontal direction.
  • the first lens 21 may be made of a resin material such as PMMA, COC or COP, which has a refractive index of 1.4 to 1.6, an Abbe number of 56 to 58, for example, an optional refractive index of 1.5
  • the second lens 22 can be made of flint glass having a refractive index of 1.6 to 1.9 and an Abbe number of 20 to 40, for example, an optional refractive index of 1.8 and an Abbe number of 30; Made of the same material as the first lens.
  • the first, second, and third lenses constitute a front group lens, and focus light from the human eye, wherein the combination of different material lenses provides the possibility of eliminating the chromatic aberration of magnification, which can reduce the chromatic aberration of the display device, and other images of the display device. Differences such as spherical aberration, coma, etc. are corrected by the arrangement of the respective optical surfaces of the lens group.
  • the fourth lens 24 is also made of the same material as the first lens, which acts to deflect the chief ray as perpendicular as possible to the microdisplay chip and to eliminate distortion.
  • the first, third, and fourth lenses are arranged as axisymmetric aspherical convex lenses.
  • the materials of the aspherical lenses are optical resins, which are difficult to process, so that a molding die can be used in mass production so that Pressing the lens in large quantities ensures production cost and reliability.
  • the second lens 22 is a spherical concave lens.
  • the working band of this embodiment is a visible light band, and is designed to use 0.486 ⁇ m of F light, 0.588 ⁇ m of d light, and 0.656 ⁇ m of C light.
  • the imaging quality of this embodiment is shown in Figures 5a and 5b, wherein Figure 5a shows FIELD CURVATURE and DISTORTION, as can be seen from the right-right curve, the Y-direction distortion is less than 1.6%. .
  • the degree of distortion of the optical system of this example is small.
  • Figure 5b shows the dot map (SPOT DIAGRAM) of each field of view.
  • the field of view is selected as (0, 0), (10.5, 0), (15, 0), (0, 6.3), (0, 9). , (10.5, 6.3), (15, 9), (-15, 9), (10.5, 6.3), (-15, 0), (-10.5, 0) degrees.
  • the figure shows the RMS radii of the dot-column points of each field of view: 12.452 ⁇ , 15 ⁇ 472 ⁇ , 21.034 ⁇ , 17.405 ⁇ , 17,372 ⁇ , 16.097 ⁇ , 15 ⁇ 536 ⁇ , 15.561 ⁇ , 14.874pm, 18.180 ⁇ , 13.128 (jm. is sufficient to meet the requirements of the visual optical system.
  • the optical lens group is used in the present invention to magnify the image generated by the micro display chip, and then reuse
  • the light-conducting plate transmits the enlarged image to the human eye for observation by the human eye.
  • the optical conductive plate can enlarge the size of the pupil, and since the light-conducting plate is very thin, the entire display device has a large field of view and a large exit size. The characteristics of the large eye point distance; at the same time, the difficulty of processing each lens in the optical lens group, so that the production cost and reliability are guaranteed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Description

眼镜式显示装置 技术领域
本发明涉及光学成像系统，涉及一种具有较大视场、较大出瞳尺寸的眼镜 式显示装置。 背景技术
眼镜式显示装置的作用， 是将微显示芯片 (如 LCD、 LCOS或者 OLED)所 产生的图像放大成虚像再供人眼进行观察， 其中 LCD ( Liquid Crystal Display) 为液晶显示， OLED(Organic Light Emitting Diode)为有机发光二极管， LCOS(Liguid Crystal on Silicon)为反射式硅基液晶。 使用时， 整个显示装置被 佩戴于非常接近于人眼的位置， 具有便携性、 移动性等优点。 为了便于佩戴， 要求眼镜式显示装置在保证足够的成像质量、足够的视觉放大率的情况下，体 积能尽量的小、 重量能尽量的轻。 '
因具有便携性、移动性等优点， 并可实时提供大屏幕显示效果， 眼镜式显 示装置不仅可以应用于军事领域满足实时观察图像的需求，更可广泛应用于民 用多媒体视听领域。 由于其广泛的市场应用前景，众多研究机构和公司对眼镜 式显示技术进行了大量的投入， 目前已经出现了多种眼镜式显示技术方案。
美国 Micro Optical 公司申请的美国专利中， 提供了多种眼镜式显示技术 方案， 所述美国专利包括： US 5,715,377、 US 5,886,822、 US 6,023,372和 US 6,091,546ο 其中一种方案是将微显示芯片产生的光学图像经由光学系统放大 后，再由导光装置将图像传导到人眼进行观察，其中图像可以传导至瞳孔的侧 面或者正面， 这种方案中， 为了降低显示装置的体积， 减小了显示的视场， 因 此无法提供大显示尺寸。另一种方案是通过半反半透棱镜来实现，这种显示装 置的体积会随人眼可观察范围 (出瞳尺寸)和视场的增加而急剧加大， 所以仅适 合小视场和低分辨率显示 (例如 11度水平视场， 320 X240分辨率)。
在美国专利 US 6,028,708、 US 6,097,354、 US 5,436,765, US 5,959,780、 以及 US6，317,267中，提供了采用离轴自由曲面棱镜对图像迸行放大的显示系
1
确认本 统， 这些方案中可达到较高的光学质量和高解析度， 但是， 如果想实现较大的 出瞳尺寸和较大的视场， 同样需要增大显示装置的体积和重量。不仅如此， 由 于光学系统离轴的缘故， 会使得系统设计难度高， 畸变难于消除 (3%)， 且非轴 对称的自由曲面加工难度也非常大。
在美国专利 US 09/801,405(公告号 US 2001/0033401 A1)和 US 6,169,613 中，采用了全息光学器件和光传导平板的方法，使得整个眼镜式显示装置可以 实现轻薄化， 但全息光学元件难于批量化、且其色差消除困难，这些缺点限制 了此种方案的推广应用。
发明内容
针对现有技术的上述缺陷，本发明要解决传统眼镜式显示装置中当增大视 场和出瞳尺寸时必须增大尺寸和重量的问题，并提供一种具有较大视场、较大 出瞳尺寸并支持高解析度的轻薄型眼镜式显示装置。
为解决上述技术问题，本发明采用了如下技术方案：构造一种眼镜式显示 装置，包括微显示芯片、对所述微显示芯片产生的图像进行放大处理的光学透 镜组、 以及将所述光学透镜组输出的光线传送到人眼的光传导平板； 其中， 所' 述微显示芯片、光学透镜组及光传导平板沿着光线传播方向依次放置；所述光 传导平板与所述人眼的观察轴线垂直，所述光学透镜组的轴线与所述人眼的观 察轴线之间的夹角为 45度〜 65度。
本发明中，所述光学透镜组中可包括沿着光线传播方向依次放置的四个透 镜， 其中第一透镜、第二透镜和第三透镜用于对光束进行聚焦并消除色差，第 四透镜用于对主光线进行偏转处理以使之垂直于所述微显示芯片并消除畸变。
本发明中， 所述第一、第三、第四透镜最好为偶次非球面凸透镜， 所述第 二透镜为球面双凹透镜。
本发明中， 所述第一、 第三、 第四透镜可采用 PMMA、 COC或者 COP 树脂材料制成， 该树脂材料的折射率为 1.45〜1.6， 阿贝数为 56~58； 所述第二 透镜可采用火石玻璃材料制成， 该玻璃材料的折射率为 1.7〜1.9， 阿贝数为 20〜40。 本发明中， 所述微显示芯片与第一透镜之间的距离可为 3mm〜10mm; 所 述微显示芯片与第四透镜之间的总长度小于 50mm;所述人眼的观察位置与光 传导平板之间的距离可为 10mm~25mm。
本发明中，所述光传导平板为多个部分反射面结合而成的光学平板，其厚 度为 2mn！〜 3皿； 其中每一个部分反射面与该光传导平板底面之间的夹角 25 度〜 45度， 每一个部分反射面的反射率为 20%〜30%。
本发明所述眼镜式显示装置的出瞳尺寸为 15mmX 8mm， 半视场为. 15度 X9度。
由上述技术方案可以看出，本发明中采用光学透镜组对微显示芯片产生的 图像进行放大后，再利用光传导平板将放大后的图像传送到人眼， 以供人眼进 行观察。其中光学传导平板可扩大出瞳尺寸， 由于光传导平板非常薄， 因此整 个显示装置具有大视场、大出瞳尺寸和大眼点距的特点； 同时光学透镜组中的 各个透镜加工难度低， 使得生产成本和可靠性都得到了保证。 附图说明
图 1是本发明一个优选实施例中的眼镜式显示装置的结构示意图； 图 2是图 1所示光学透镜组展开后的结构示意图；
图 3是图 1所示光传导平板的工作原理图；
图 4是图 2所示光学透镜组的工作原理图；
图 5a和图 5b是图 2所示眼镜式显示装置的像质分析图。
图中， 1是微显示芯片， 2是透镜组， 21、 22、 23、 24分别是第一、 二、 三、 四透镜， 3是光传导平板 (简称光导板)， 4是人眼， 5是人眼轴线， 6是透 镜组轴线， 7是入射光线， 8是部分反射面。 具体实施方式
本发明的一个优选实施例中， 眼镜式显示装置的结构如图 1和图 2所示。 在图 1中示出的是光学透镜组 2的整体结构，图 2则示出了光学透镜组 2具体 由四个透镜组成。 其中， 微显示芯片 1 与第一透镜 21 之间的距离可为 3mm〜10mm，本实施例中为 5mm;微显示芯片与第四透镜 24之间的总长度小 于 50mm， 本实施例中为 49mm; 人眼 4的观察位置与光传导平板 3之间的距 离为 10mn！〜 25mm， 本实施例中为 15mm。其中光传导平板的厚度为 3mm， 还 可以进一步缩小至 2mm。 该眼镜式显示装置的出瞳尺寸为 15mmX 8mm， 半 视场为 15度 X 9度。
其中，光传导平板 3与人眼的观察轴线 5垂直，光学透镜组 2的轴线与人 眼的观察轴线 5之间的夹角为 45度〜 65度。 图 3示出了光传导平板 3对光线的传输效果，该光传导平板为多个部分反 射面结合而成的光学平板；其中每一个部分反射面与该光传导平板底面之间的 夹角 25度〜 45度， 每一个部分反射面的反射率为 20%〜30°/。。
当入射光 7射进光传导平板 3后， 由于光线满足光传导平板全反射条件， 因此会有全反射作用，使得光线被约束于光传导平板 3中，并传输至各个部分 反射面 8。
每一个部分反射面 8的作用是对照射在其上的光束进行部分反射。具体来 说， 针对光传导平板中的任一个部分反射面 8， 入射光 7的部分反射光垂直于 光传导平板的表面， 不满足全反射条件从而被耦合出传导平板 3， 照射到人眼 4； 透射光由于全反射作用继续在光传导平板中传输至下一个部分反射面。 部 分反射面 8成水平阵列排布， 因此反射光亦在水平方向重复排布。亦即入射光 束 7的宽度在水平方向得到扩展。通过这种光束宽度扩展作用，光传导平板可 以很大程度上扩展光束的可观察范围，从而将透镜组所成虚像的传输至人眼观 察，并同时扩展可观察范围。光传导平板可采用无色光学玻璃或光学树脂玻璃 制成。 本例中选用 k9玻璃， 将 k9玻璃磨成锐角 30度的平行四边形形状， 在 其上蒸镀部分反射铝膜， 并将其粘接。 如图 4所示，具体实施时，光学系统采用反向设计，即假设光线由人眼 (左 方)发出， 经光传导平板传输， 然后顺序通过第一透镜 21、 第二透镜 22、第三 透镜 23和第四透镜四 24， 最终成像于微显示芯片 1的平面。 由于平行光束在 光传导平板中传输不产生任何像差， 所以设计中可以将其作为平行平板考虑， 在图 4中则未画出。 孔径光阑设置于人眼处 (左方)， 大小设为 60mmX 8mni; 并且在第一透镜 21的左方 8.1mm处设置附加光阑， 以对光束水平方向孔径大 小进行限制。
图 4中， 第一透镜 21可采用 PMMA、 COC或者 COP等树脂材料制成， 该树脂材料的折射率为 1.4〜； 1.6， 阿贝数为 56〜58, 例如可选折射率为 1.5， 阿 贝数为 57;第二透镜 22可采用折射率为 1.6〜1.9，阿贝数为 20〜40的火石玻璃 制成， 例如可选折射率为 1.8， 阿贝数为 30; 第三透镜 23 由与第一透镜相同 的材料制成。第一、第二、第三透镜组成前组透镜， 对来自人眼的光线进行聚 焦作用，其中不同材料透镜的搭配给消除倍率色差提供了可能，可以降低显示 装置的色差，显示装置的其他像差如球差、彗差等则通过透镜组各个光学表面 的配置进行修正。
第四透镜 24也由与第一透镜相同的材料制成， 其作用是尽量将主光线偏 转以垂直于微显示芯片， 并消除畸变。
为了提供提高像质，第一、第三、第四透镜被设置为轴对称非球面凸透镜 这些非球面透镜的材料均为光学树脂，加工难度低， 因此在批量化生产时可以 使用成型模具，以便于大批量压制透镜，使得生产成本和可靠性都得到了保证。 其中的第二透镜 22则是球面凹透镜。
本实施例的工作波段为可见光波段，设计时采用 0.486 μ ιη的 F光、 0.588 μ πι的 d光、 以及 0.656 μ πι的 C光。 在图 5a和图 5b中示出了本实施例的成像质量， 其中， 图 5a示出了场曲 (FIELD CURVATURE)和畸变 (DISTORTION),从中右方曲线可以看出， Y向畸 变小于 1.6%。 本实例光学系统的失真变形程度较小。
图 5b表示各视场点的点列图 (SPOT DIAGRAM), 视场点选取为 (0， 0)、 (10.5, 0)、 (15, 0)、 （0， 6.3)、 （0， 9)、 (10.5, 6.3)、 (15, 9)、 (-15, 9)、（10.5， 6.3)、（-15， 0)、（-10.5， 0)度。图中给出了各视场点的点列图 RMS半径分别为： 12.452μιη、 15·472μιη、 21.034μιη、 17.405μιη、 17,372μπι、 16.097μιη、 15·536μηι、 15.561μιη、 14.874pm、 18.180μπι、 13.128(jm。 足以满足目视光学系统的要求。 从上述实施例可以看出，本发明中采用光学透镜组对微显示芯片产生的图 像进行放大后，再利用光传导平板将放大后的图像传送到人眼， 以供人眼进行 观察。其中光学传导平板可扩大出瞳尺寸， 由于光传导平板非常薄， 因此整个 显示装置具有大视场、大出瞳尺寸和大眼点距的特点； 同时光学透镜组中的各 个透镜加工难度低， 使得生产成本和可靠性都得到了保证。

Claims

权 利 要 求
1、 一种眼镜式显示装置， 其特征在于， 包括微显示芯片（1)、对所述微显 示芯片（1)产生的图像进行放大处理的光学透镜组 (2)、以及将所述光学透镜组 (2)输出的光线传送到人眼的光传导平板 (3)；
其中， 所述微显示芯片（1)、 光学透镜组 (2)及光传导平板 (3)沿着光线传 播方向依次放置；所述光传导平板与所述人眼的观察轴线垂直，所述光学透镜 组的轴线与所述人眼的观察轴线之间的夹角为 45度〜 65度。
2、 根据权利要求 1所述的眼镜式显示装置， 其特征在于， 所述光学透镜 组 (2)中包括沿着光线传播方向依次放置的四个透镜， 其中第一透镜（21)、第 二透镜（22)和第三透镜（23)用于对光束进行聚焦并消除色差，第四透镜 (24) 用于对主光线进行偏转处理以使之垂直于所述微显示芯片并消除畸变。
3、 根据权利要求 2所述的眼镜式显示装置， 其特征在于， 所述第一、 第 三、 第四透镜为偶次非球面凸透镜， 所述第二透镜为球面双凹透镜。
4、 根据权利要求 3所述的眼镜式显示装置， 其特征在于， 所述第一、 第 三、第四透镜采用 PMMA、 COC或者 COP树脂材料制成， 该树脂材料的折射 率为 1.45〜1.6， 阿贝数为 56〜58； 所述第二透镜采用火石玻璃材料制成， 该玻 璃材料的折射率为 1.7〜1.9， 阿贝数为 20~40。
5、 根据权利要求 4所述的眼镜式显示装置， 其特征在于， 所述微显示芯 片与第一透镜之间的距离为 3mm〜10mm; 所述微显示芯片与第四透镜之间的 总长度小于 50mm ; 所述人眼的观察位置与光传导平板之间的距离为 10mm〜25mm。
6、 根据权利要求 1-5中任一项所述的眼镜式显示装置， 其特征在于， 所 述光传导平板为多个部分反射面结合而成的光学平板， 其厚度为 2mii！〜 3mm; 其中每一个部分反射面与该光传导平板底面之间的夹角 25度〜 45度， 每一个 部分反射面的反射率为 20%〜30%。
7、 根据权利要求 6所述的眼镜式显示装置， 其特征在于， 其出瞳尺寸为 15mm X 8mm, 半视场为 15度 X 9度。
PCT/CN2007/003122 2007-11-05 2007-11-05 Affichage-loupe WO2009059446A1 (fr)

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