CN1580866A - Projection display optical system and its projecting method - Google Patents

Projection display optical system and its projecting method Download PDF

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CN1580866A
CN1580866A CN 03152632 CN03152632A CN1580866A CN 1580866 A CN1580866 A CN 1580866A CN 03152632 CN03152632 CN 03152632 CN 03152632 A CN03152632 A CN 03152632A CN 1580866 A CN1580866 A CN 1580866A
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optical
device
projection
prism
group
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CN 03152632
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张绍雄
黄郁湘
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台达电子工业股份有限公司
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Abstract

The present invention relates to a projection display optical system, including a light source, an optical circuit switching device and a prism group. the prism group is placed between the optical circuit switching device and a projection device; andon the optical circuit switching device a microreflector array formed from several microreflectors is inclued; at least two gaps are formed by said prism group, so that the light entered into the prism group can produce total reflection at the interface position of first prism and gap, then is entered into the optical circuit switching device. Said invention also provides the working principle of said optical system and projection method of said projection device.

Description

投影显示器光学系统及其投影方法 Projection display optical system and projection method

技术领域 FIELD

本发明是关于一种投影显示器光学系统,特别是关于一种可同时提高影像对比及投影镜头视角的投影显示器光学系统设计。 The present invention relates to an optical projection display system, particularly to a design which can improve the image contrast projection display optical system and projection lens viewing angle.

背景技术 Background technique

投影显示器一般是由照明系统和投影系统所组成。 Projection display typically by the illumination system and the projection system is composed. 照明系统用于将光源发出的光线投射至一数字微镜组合装置,该数字微镜组合装置上具有大量可独立控制的微小光学调整组件,这些微小光学调整组件组合成影像,再经由投影装置投射至显示屏幕。 An illumination system for projecting the light emitted from the light source to a combination of a digital micromirror device having a large number of microscopic optical assembly may be independently controlled to adjust the composition of the digital micromirror device, these minor adjustments optical components into an image to be projected via the projection means to the display screen. 以德州仪器(TI)制造的数字微镜装置(DigitalMicromirror Device;DMD)为例,该微小光学调整组件是由大量微反射镜所构成,通过控制镜面倾斜角度产生使光线穿透投影系统(亮态)或不穿透投影系统(暗态)两种变化,从而改变显示器的亮度。 A digital micromirror device (DigitalMicromirror Device; DMD) to Texas Instruments (TI) manufactured as an example, the fine adjustment optical assembly is composed of a large number of micro mirror, the mirror is produced by controlling the inclination angle of the light rays penetrating the projection system (the bright state ), or does not penetrate the projection system (dark state) two changes, thus changing the brightness of the display.

图1为一公知投影显示器光学系统100的示意图。 1 is a schematic projection display optical system 100 is a well-known. 如图1所示,藉由控制数字微镜装置102上的微反射镜倾斜角度,可使入射光沿行进方向108入射至投影装置104中而构成一亮态模式(Light-state),或沿另一方向110偏离投影装置104射出而构成一暗态模式(Dark-state),借此改变显示器中各个像素单元的亮度。 1, by controlling the DMD micro-mirror device 102 on the tilt angle, the incident light can travel direction 108 is incident to the projection device 104 to form a bright state mode (Light-state), or along another direction 110 offset from the projection apparatus 104 is emitted to form a dark state (dark-state), thereby changing the brightness of each pixel of the display unit. 数字微镜装置102与投影装置104间设置有一内部全反射(Total Internal Reflection)棱镜106,其是由两棱镜106a及106b间隔一空气间隙(Air Gap)112组合而成,通过使棱镜106b与气隙112间满足的全反射条件,可导引入射光I沿图示的光路行进。 102 between the DMD and the projection unit 104 is provided with a total internal reflection (Total Internal Reflection) prism 106, which is composed of two prisms 106a and 106b spaced by an air gap (Air Gap) 112 combination, by the prism 106b and the air satisfy the total reflection condition of the gap 112, the incident light can be guided along the path I shown travels. 然而,此一设计无论是亮态或暗态情况下光线行进路径皆相同,差别仅在最后藉由微反射镜倾斜角度变化将光线入射或偏离投影装置104,然因微反射镜倾斜角度有限,如此会导致一明显缺点,即暗态下本应偏离投影装置104沿方向110射出的光线,其靠近投影装置104的部分容易进入投影装置104而导致影像对比变差。 However, this design both the traveling path of light are the same light state or dark state, the only differences micromirror by the light incident on the inclination angle or offset 104 at the end of the projection apparatus, however due to limited micromirror tilt angle, thus cause a significant drawback, i.e., a black state should deviate the light projection device 104 is emitted in a direction 110, which is close to the projection portion 104 of the device 104 into the projecting means readily cause deterioration of image contrast. 此时虽可拉长投影装置104与棱镜106的距离来减少暗态的杂光进入投影镜头,但如此会导致背焦过长而不易设计出广视角的投影镜头。 At this time, although the distance can be elongated prism 106 and the projection apparatus 104 to reduce the dark state light heteroaryl enters the projection lens, but such will lead to long back focus is not easy to design a wide angle projection lens.

图2A和图2B为一投影显示器光学系统200的示意图,显示公知内部全反射棱镜设计的另一实施例。 2A and FIG. 2B is a schematic view of a projection display optical system 200, shows another known design the internal total reflection prism embodiment. 投影显示器光学系统200的棱镜206是为三片式设计,两相邻棱镜间分别间隔一气隙208和气隙210。 Projection display 200 of the prism optical system 206 is a three-piece design, the interval between two adjacent prisms and the air gaps 208 a gap 210. 在图2A所示的亮态下,入射光I按照气隙208与棱镜206间形成的全反射条件投射至数字微镜装置202,再经数字微镜装置202上的微反射镜反射后行经棱镜206后进入投影装置204。 In the bright state shown in Figure 2A, the projection of the incident light I in accordance with the total reflection condition with the air gap 208 is formed between the prism 206 to the digital micromirror device 202, and then reflected by the micro-mirrors on the DMD 202 passing through the prism after 206 into the projection apparatus 204. 反之,于图2B所示的暗态下,由数字微镜装置202上的微反射镜反射出的光线,会因气隙210与棱镜206间形成的全反射条件即反射至外界而不会进入投影装置204。 Conversely, a black state in FIG. 2B shown, reflected by the micro mirror of the DMD 202 on the light, the total reflection condition due to the air gap 210 is formed between the prism 206 and that is reflected to the outside without entering the projection means 204. 借助棱镜206的设计,此一做法虽可使暗态下由数字微镜装置202反射出的光行进路径产生变化,使暗态下的杂光不易进入投影装置204。 Designed by the prism 206, the light traveling path of this approach reflected by the digital micromirror device 202, although variations can produce a black state, so that the dark-state light heteroaryl easily enters the projection apparatus 204. 然而,此做法会使棱镜206组装厚度W变厚,使得数字微镜装置202至投影装置204的距离增大,同样地会导致背焦过长而不易设计广视角的投影镜头。 However, this approach causes thickening the thickness W of the prism assembly 206, so that the digital micromirror device 202 to the projection device 204 increases the distance, in the same manner will lead to a long back focus and difficult to design wide angle projection lens.

发明内容 SUMMARY

因此,本发明的目的在提供一种投影显示器照明系统,其能有效解决暗态杂散光问题以提高影像对比度,且能同时缩短背焦以利广角投影镜头的设计。 Accordingly, an object of the present invention is to provide a projection display lighting system, which can effectively solve the problem of stray light dark state in order to improve image contrast, and can simultaneously shorten the back focus to facilitate wide-angle projection lens design.

按照本发明的设计,一种投影显示器光学系统包括一光源、一光路切换装置及一棱镜组。 According to the design of the present invention, a projection display optical system includes a light source, an optical path switching means, and a prism group. 棱镜组设置于光路切换装置与一投影装置之间;光路切换装置包括有一由多个微反射镜所构成的微反射镜阵列;棱镜组形成至少二间隙,使进入棱镜组的光线于所遭遇的第一个棱镜与间隙的接口处产生全反射而进入光路切换装置。 Prism group disposed in an optical switching device and a projection device; the optical path switching means comprises a micromirror array of a plurality of micro mirrors configured; prism group is formed of at least two gaps, so that the light enters the prism group in encountered a first prism interface and the gap is totally reflected into the optical path switching means. 通过调整每一微反射镜的镜面倾角,当微反射镜处于亮态模式时,经微反射镜反射后的光线直接通过棱镜组并进入投影装置;当微反射镜处于暗态模式时,经微反射镜反射后的光线于所遭遇的第一个棱镜与间隙的接口处产生全反射而无法进入投影装置。 By adjusting the mirror angle of each micromirror, when the micromirror is in white mode, the modulated light reflected by the micro-mirrors directly into the prism and the projection means; when the micromirror is in the dark state, the micro- after the light reflected by the mirror is totally reflected at the interface in the first prism and a gap is encountered can not enter the projection apparatus.

再者,本发明设计使当微反射镜处于暗态模式时,光线于邻近微反射镜阵列的棱镜与气隙的界面间发生全反射后,经反射的光线能再于最邻近微反射镜阵列的棱镜内表面处再次发生全反射,使暗态下入射光行进光路可被局限于棱镜中。 After the addition, the present invention is designed so that when the micromirror is in the dark state mode, the total reflection of light occurs between the prism and the air gap adjacent the micro mirror array interface, the reflected light again in a micromirror array Closest the inner surface of the prism is totally reflected again, so that the dark state of the incident light traveling the optical path may be limited to the prism.

按照本发明的设计,暗态模式下由微反射镜阵列反射出的光线,当其进入第一个遭遇的棱镜时即可于该棱镜与气隙的接口间产生全反射,获得于所能设计的最短距离内迅速将暗态模式的入射光偏离投影装置的效果,而可大幅减少棱镜组整体构装厚度以缩短背焦,如此易于设计广视角的镜头且可完全避免杂散光进入投影镜头。 Designed according to the present invention, the dark state light reflected by the micromirror array, which can be totally reflected within the prism and the air gap between the interface when it enters the first prism face, can be obtained in design quickly dark state of the incident light deviates from the shortest distance of the projection effect device, but may significantly reduce the overall thickness of the package as the prism group to shorten the back focus, so easy to design a wide angle lens and can completely prevent stray light from entering the projection lens. 再者,本发明进一步配合棱镜表面制造出的全反射条件,还可将暗态下由微反射镜阵列反射出的光线局限在棱镜中,再由其远离投影装置方向的一侧面散逸,如此更可确保暗态杂散光不进入投影装置的效果。 Furthermore, the present invention further mating surface of the prism total reflection condition is produced, the dark state can also be reflected by the micromirror array light confined in the prism, then by a side remote from the direction of the projection apparatus dissipation, thus more dark state can secure the effect of the stray light does not enter the projection apparatus.

附图说明 BRIEF DESCRIPTION

图1为一公知投影显示器光学系统的示意图;图2A及图2B为一投影显示器光学系统示意图,显示公知全内反射棱镜设计的另一实施例;图3为依本发明的一实施例,显示一投影显示器光学系统的示意图;图4A及图4B为依本发明的一实施例,显示入射光进入棱镜组后的光路示意图,图4A显示亮态模式下的光路,图4B显示暗态模式下的光路;图5为按照本发明设计的棱镜组与公知技术比较的制作实例;图6为一示意图,显示本发明棱镜组设计的一变化例。 Figure 1 is a well-schematic art projection display optical system; FIGS. 2A and 2B a schematic view of a display optical system of a projector, for displaying a further reflecting prism designed in known full embodiment; FIG. 3 is under this one embodiment of the invention, the display a schematic view of a projection display optical system; is under this one embodiment of the invention, the display light path schematic view of the incident light enters the prism, the optical path in FIG. 4A shows white mode, FIG. 4B shows the FIGS. 4A and 4B, the dark state light path; FIG. 5 according to the present invention is designed for the production of a prism group and the comparative example of the known art; FIG. 6 is a schematic view showing a variant embodiment of the present invention is designed prisms.

零件符号说明:10 影显示器光学系统12 光源14 光导管16 中继透镜18 棱镜组18a、18b、18c 棱镜20 光路切换装置20a 微反射镜阵列22 投影装置24、26 空气间隙28 光吸收层30 椭球反射面100 投影显示器光学系统102 数字微镜装置104 投影装置 Part SYMBOLS 10: Movies display optical system 12 light source 14 light guide prism 16 the relay lens group 18 18a, 18b, 18c of the prism 20 the optical path switching means 20a ellipsoid 30 a micromirror array device 24, 26, 22 an air gap 28 projected light absorbing layer spherical reflecting surface 100 projection display optical system 102 DMD projection apparatus 104

106、106a、106b 棱镜108 亮态模式光行进方向110 暗态模式光行进方向112 空气间隙200 投影显示器光学系统202 数字微镜装置204 投影装置206 棱镜208、210 空气间隙I 入射光R 反射面S1、S2棱镜表面W、W′ 棱镜组厚度具体实施方式图3为本发明的一实施例,显示一投影显示器光学系统10的示意图。 106,106a, 106b of the prism 108 white mode 110 traveling direction of the light dark state light traveling direction 112 of the air gap 200 projection display optical system 202 204 DMD projection apparatus 208, the air gap 206 of the prism reflecting surface S1 I incident R a prism surface S2 embodiment W, W 'prism thickness DETAILED DESCRIPTION Figure 3 embodiment of the present invention, a schematic view of a projection display optical system 10 is shown. 光学系统10包括一光源12、一光导管14、一中继透镜16、一棱镜组18、一光路切换装置20及一投影装置22。 The optical system 10 comprises a light source 12, a light guide 14, a relay lens 16, a prism 18, an optical path switching means 20, and a projection apparatus 22. 光源12周围可设置一集光器例如一椭球反射面30,以将光源12发出的光线会聚至光导管14,光导管14周边壁面为反射面,光线经反射壁面多次反射后由光导管出口端射出均匀分布的光束,再经由中继透镜16投射至棱镜组18。 The light source 12 may be disposed around a collector such as an ellipsoidal reflecting surface 30 converges the light ray emitted from the light source 12 to the light pipe 14, the surrounding wall of the light guide reflection surface 14, the reflected light is repeatedly reflected by the wall surface of the light guide the outlet end of the beam emitted uniformly distributed, and then projected onto the prism 18 via the relay lens 16. 光路切换装置20上具有由多片微反射镜所形成的微反射镜阵列20a,藉由调整微反射镜阵列20a的微反射镜镜面的倾角,可构成光线进入投影装置22的亮态模式(Light-state),或光线偏离投影装置22的暗态模式(Dark-state),藉以改变显示器中各个像素单元的亮度。 Optical path switching means 20 having a micro-mirror array by a plurality of sheet micromirror formed 20a, by reclining micromirror array 20a micromirror mirror surface, can constitute a light entering the projection apparatus white mode 22 (Light -state), departing from the dark state or light (dark-state) of the projection means 22, thereby changing the brightness of each pixel of the display unit. 于此需注意本发明的光路切换装置20通过调整微反射镜镜面的倾角以切换行进光路的可能模式,包括但不限定于上述的亮态及暗态模式,而可依实际需求变化。 It should be noted in this invention the light path switching means for adjusting the inclination of the micro mirror 20 by the mirror mode may switch the optical path of travel, including but not limited to the bright state and the dark state, and the change per request.

图4A及图4B为依本发明的棱镜组设计,显示入射光I进入棱镜组18后的光路示意图,图4A显示亮态模式下的光路,而图4B显示暗态模式下的光路。 4A and FIG. 4B is a prism design under this invention, showing a schematic view of the optical path of the incident light I enters the prism 18, an optical path in FIG. 4A displays white mode, and FIG 4B shows an optical path in the dark state. 依本实施例,棱镜组18是由邻近光导管14的棱镜18a、邻近光路切换装置20的棱镜18b及邻近投影装置22的棱镜18c所构成,棱镜18a及棱镜18c间形成有一空气间隙24,且棱镜18a及棱镜18b间形成另一空气间隙26。 Under this embodiment, 18 is adjacent the light guide prism of the prism group 14 18a, adjacent to the optical path switching prism 18b and the adjacent projection apparatus device 20 of the prism 22 18c constituted, a prism 18a and a prism 18c is formed between an air gap 24, and another air gap 26 formed in the prism 18a and a prism 18b.

由照明端而来的入射光I以一定入射角首先进入棱镜18a,接着,入射光I因气隙24与棱镜18a的界面的入射角大于司涅尔定律(Snell′s law)的内部全反射临界角,故入射光I即首先于该接口被反射至光路切换装置20。 By the illumination from the end of a certain incident angle of the incident light I enters the prism 18a first, and then, due to the total internal reflection of the incident light I and the air gap 24 of the prism 18a is greater than the angle of incidence of the interface Snell's law (Snell's law) of critical angle, i.e., it is first incident light I is reflected to the interface to the optical path switching means 20. 如图4A所示,当光路切换装置20上的微反射镜阵列20a倾角选择为亮态模式时,经微反射镜阵列20a反射后的光线,依序经由气隙26及气隙24后入射至投影装置22。 4A, when a micromirror array 20a as white mode selected inclination on the optical path switching means 20, the light after reflection micro mirror array 20a, sequentially via the air gap 26 and the gap 24 is incident to projection means 22. 当微反射镜阵列20a倾角选择为暗态模式时,如图4B所示,经微反射镜阵列20a反射后的光线以另一入射角入射至棱镜组18时,本发明设计使由微反射镜阵列20a反射后的光线,于其所遭遇的第一个棱镜18b与气隙26的界面间的入射角大于司涅尔定律(Snell′s law)的内部全反射临界角,而为气隙26所反射,获得于所能设计的最短距离内迅速将暗态模式的入射光偏离投影装置22的效果。 When a micromirror array 20a selected angle is the dark state, shown in Figure 4B, the light rays after the micro mirror array 20a reflected at another incident angle to prism 18, by the design of the present invention is that the micromirror after the light reflecting array 20a, 18b to the first prism and the air gap between it encounters an incident angle greater than the internal interface 26 of Snell's law (Snell's law) of the total reflection critical angle, and the air gap 26 the reflected incident light quickly dark state deviates from the projection device 22 results in the shortest distance can be obtained in design.

接着,本发明的棱镜组18设计使当光线于棱镜18b与气隙26的界面间发生全反射后,经反射的光线能于棱镜18b其最邻近微反射镜阵列20a的表面S1处再次发生全反射,且因本发明的棱镜18b角度设计使光线于表面S1处再次发生全反射后,其后入射至棱镜18b除侧面S2外的内表面时其入射角度皆大于临界角,故暗态下入射光的行进光路可如图示被局限在棱镜18b中,最后控制在由棱镜18b的侧面S2散出,确保暗态杂散光完全远离投影装置22的效果。 Next, prism 18 is designed such that when the present invention is totally reflected light in the interface between the prism 18b and the air gap 26 after the light is reflected by the prism 18b which can be most adjacent to a micromirror array of the surface S1 20a recurrence of a full after reflection, the prisms 18b and because the present invention is designed so that the angle of the light on the total reflection surface S1 again, and thereafter enters the prism 18b to the other when the inner surface of the outer side surface S2 which are greater than the critical angle of incidence angle, it enters a black state the traveling path of light can be confined as shown in the prism 18b, and finally shed control by the prism side surface 18b of S2, ensuring the effect of the stray light is completely dark state device 22 remote from the projection. 再者,亦可将一光吸收物质设置于棱镜18b侧面以吸收散逸的光线,举例而言可于棱镜18b的侧面S2涂布一光吸收层28。 Furthermore, a light-absorbing material may be disposed on the side surface of the prism 18b to absorb light dissipated, for example can be coated on the side surface S2 of the prism 18b, a light absorbing layer 28.

按照本发明的棱镜组18的设计,可使暗态模式下由微反射镜阵列20a反射出的光线,当其进入第一个遭遇的棱镜时即可于该棱镜与气隙的接口间产生全反射,获得于所能设计的最短距离内迅速将暗态模式的入射光偏离投影装置22的效果,而可大幅减少棱镜组整体构装厚度以缩短背焦,如此易于设计广视角的镜头且可完全避免杂散光进入投影镜头。 By design of prisms 18 according to the present invention enables light from the dark state micro mirror array 20a is reflected, when it enters the first prism face of the prism can be in the air gap between the interface and generate a full reflection, the incident light is obtained quickly in the dark state of the projector apparatus 22 is offset from the effect of the shortest distance can be designed, but may significantly reduce the overall thickness of the package as the prism group to shorten the back focus, so easy to design a wide angle lens and can be completely prevent stray light from entering the projection lens.

再者,本发明进一步配合棱镜表面制造的全反射条件,还可将暗态下由微反射镜阵列反射出的光线局限在一棱镜中,再将该光线由棱镜远离投影装置方向的一侧面散逸,如此更可确保暗态杂散光不进入投影装置的效果。 Note that a side surface, the present invention further mating surface of the prism total reflection condition manufactured, a black state may also be reflected by the micromirror array confined in a prism light, then the light from the prism arrangement direction of the projection away from the dissipation , thus ensuring more dark state the effect of stray light does not enter the projection apparatus.

图5为依本发明设计的棱镜组与公知技术比较的制作实例。 5 is designed under this invention with the known art prisms made a comparative example. 在保持相同条件来符合个别全反射条件的情形下,例如采用相同棱镜材质、采用同一微反射镜阵列等等,就光路切换装置与投影装置间的棱镜组装厚度而言,如图5所示,当公知三片式棱镜的组装厚度W约需77.2mm时,本发明的棱镜组组装厚度W′仅需23.96mm即可达成相同效果。 In the case of maintaining the same conditions to meet the individual conditions for total reflection, for example using a prism same material, using the same micro mirror array, etc., to the optical path switching assembly thickness between the prism device and the projection device, as shown in FIG 5, when the well-known three prism assembly thickness W Approximately 77.2mm, prism assembly according to the present invention, the thickness W 'of only 23.96mm to achieve the same effect.

图6为一示意图,显示本发明棱镜组18的一变化例。 FIG 6 is a schematic view showing a variation of the prism 18 of the present invention. 本发明的棱镜组18设计仅需保持相邻棱镜间的气隙以提供全反射条件,其外形及配置关系可应实际需求进行任意变化。 Prism 18 is designed to maintain the present invention only air gap between adjacent prisms to provide a total reflection condition, an arbitrary change of the shape, and arrangement thereof may be practical needs. 举例而言,如有缩短光学系统光路的需求时,公知做法是于照明端多配置一面反射镜以变化入射光的行进光路。 When For example, if the demand to shorten the optical path of the optical system, it is known practice to configure multiple lighting side end mirror travels in the optical path of the incident light. 然而,按照本发明的设计,可如图6所示改变靠近照明端的棱镜18a的外形使其能多提供一反射面R,以使入射光先经由该反射面R反射后再进入棱镜18a与间隙24的界面处发生全反射,如此同样可获得变化系统光路的效果而可取代于照明端配置的反射镜,达到减少制造成本并使组装更为便利的目的。 However, the design according to the present invention, can change the shape shown near the end of the lighting prism 18a in FIG. 6 so that it can provide a multi-reflecting surface R, so that the incident light 18a before entering the prism through the gap between the reflective surface and then reflected R 24 is totally reflected at the interface, so the same effect can be obtained while the optical path changes in the system may be substituted in the side mirror illumination configuration, to reduce the manufacturing costs and assembly more convenient purpose.

以上所述仅为举例性,而非为限制性的。 The foregoing is merely illustrative and not limiting. 任何未脱离本发明的精神与范畴,而对其进行的等效修改或变更,均应包括在本申请的权利要求书的范围内。 Any without departing from the spirit and scope of the invention, and its equivalent modifications or variations should be included within this application as claimed in claim scope.

Claims (12)

  1. 1.一种投影显示器光学系统,包括:一用以产生一光线的光源;一用以接收该光线且具有将该光线反射至不同光路的多个切换模式的光路切换装置,该多个切换模式其中的一第一模式是将该光线反射并进入至一投影装置且一第二模式是将该光线反射并偏离该投影装置;和一设置于该光路切换装置与该投影装置之间的棱镜组,其包括一第一棱镜、一第二棱镜及一第三棱镜,该第一棱镜与该第二棱镜间形成有一第一间隙,该第一棱镜与该第三棱镜间形成有一第二间隙;其中该光线是以经全反射方式进入该光路切换装置,且于该光路切换装置的该第一模式下将该反射光线依序通过该第一间隙及该第二间隙并进入该投影装置,在该第二模式下将该反射光线于该第一间隙与棱镜的接口发生全反射而偏离进入该投影装置的行进方向。 A projection display optical system, comprising: a light source for generating a light; one for receiving the light beam and the optical path of the reflected light having different optical paths to a plurality of switching mode switching means, the plurality of switching modes a first mode wherein the light is reflected and goes to a projection device and a second pattern is offset from the reflected light and the projection means; and a prism group disposed between the switching device and the projection device to the light path , which includes a first prism, a second prism and a third prism, the first prism is formed with a first gap is formed between the first prism and the third prism having a second gap between the second prism; wherein the the light is totally reflected by the way into the optical path switching means, and in the optical path switching device in this first mode the light reflected sequentially by the first gap and the second gap and enters the projection device, the first the second mode the reflected light is totally reflected at the interface of the first gap enters the prism deviates the traveling direction of the projection apparatus.
  2. 2.如权利要求1所述的投影显示器光学系统,其特征在于:在该第二模式下于该第一间隙与棱镜的接口发生全反射的该光线,于最邻近该光路切换装置的棱镜内表面发生全反射。 2. The projection display optical system according to claim 1, characterized in that: the light beam totally reflected at the interface of the second mode to the first gap and the prism, the most adjacent to the optical path within the prism switching apparatus total reflection surface.
  3. 3.如权利要求2所述的投影显示器光学系统,其特征在于:还包括一设置于该光线于该棱镜的该内表面发生全反射后的行进光路径上的光吸收物质。 The projection display optical system according to claim 2, characterized in that: further comprising a light traveling on a light path of the light provided to the to the inner surface of the prism is totally reflected absorbing material.
  4. 4.如权利要求3所述的投影显示器光学系统,其特征在于:该光吸收物质是为涂布于一棱镜表面的光吸收层。 4. The projection display optical system according to claim 3, wherein: the light-absorbing substance is applied to the light absorbing layer to a surface of the prism.
  5. 5.如权利要求1所述的投影显示器光学系统,其特征在于:该光路切换装置表面包括一由多个微反射镜所形成的微反射镜阵列,该光路切换装置是经由该微反射镜阵列接收并反射该光线。 5. The projection display optical system according to claim 1, wherein: the optical path switching means comprises a surface of a micro-mirror array by a plurality of micro-mirrors formed, the optical path through the switching device is a micromirror array and receiving the reflected light.
  6. 6.如权利要求1所述的投影显示器光学系统,其特征在于:还包括一光导管设置于该光源与该棱镜组间,以均匀化该光线。 6. The projection display optical system according to claim 1, characterized in that: further comprising a light pipe disposed between the light source and the prism, to homogenize the light.
  7. 7.如权利要求6所述的投影显示器光学系统,其特征在于:还包括一中继透镜设置于该光导管与该棱镜组间,以将该均匀化光线投射至该光路切换装置。 7. The projection display optical system according to claim 6, characterized in that: further comprising a relay lens disposed between the light guide and the prism group, the homogenized light to the projected optical path switching means.
  8. 8.一种投影显示器光学系统的投影方法,包括如下步骤:将一光源发出的光线引导至一光路切换装置;在该光路切换装置与一投影装置之间设置一棱镜组,该棱镜组包括于每两相邻棱镜间形成有一间隙的多个棱镜,且配置使进入该棱镜组的光线于所遭遇的第一个棱镜与间隙的接口处发生全反射并进入该光路切换装置;及利用该光路切换装置的多个切换模式将进入该光路切换装置的该入射光切换至不同光路,其中的一切换模式是将经该光路切换装置反射后的光线直接通过该棱镜组并进入该投影装置,另一切换模式是将经该光路切换装置反射后的光线于所遭遇的第一个棱镜与间隙的接口处发生全反射而偏离该投影装置。 8. A projection method of a projection display optical system, comprising the steps of: a light source emitted light is guided to an optical path switching means; and a switching means provided between a prism and a projection device in the optical path to the prism group comprises between every two adjacent prisms formed with a plurality of prisms gap, and arranged so that light entering the prism in the first group and the gap at the interface of the prism encountered totally reflected and enters the optical path switching means; and a light path by using the a plurality of switching the mode switching means to enter the incident light to the optical path switching means is switched to different optical paths, wherein a switching pattern is the light device after reflection by the optical path switching directly through the prism and enters the projection means, the other a mode switching means after the light is reflected to the first encounter with a gap at the interface of the prism is totally reflected by the offset from the projection optical path switching means.
  9. 9.如权利要求8所述的投影显示器光学系统的投影方法,其特征在于:在该另一切换模式下,该棱镜组是设置使经该光路切换装置反射后的光线于所遭遇的第一个棱镜与间隙的接口处产生全反射后,再于最邻近该光路切换装置的一棱镜内表面发生全反射。 In the other first switching mode, the prism is disposed so that the light reflected by the rear of the apparatus to the optical path switching encountered: 9. The method of claim 8 projection optical projection display system as claimed in claim, characterized in that a prism at the interface surface of the inner space after the prism is totally reflected, and then the most adjacent to the optical path switching means is totally reflected.
  10. 10.如权利要求9所述的投影显示器光学系统的投影方法,其特征在于:还包括设置一光吸收物质以吸收于该棱镜的该内表面发生全反射后的该入射光的步骤。 10. The projection method of claim 9 projection display optical system as claimed in claim, characterized in that: further comprises a light-absorbing material to absorb the step of the inner surface of the prism after the incident occurs in the total reflection.
  11. 11.如权利要求8所述的投影显示器光学系统的投影方法,其特征在于:该光路切换装置表面包括一由多个微反射镜所形成的微反射镜阵列,该光路切换装置是藉由调整该微反射镜阵列的每一微反射镜的镜面倾角以形成不同的切换模式。 11. The projection method of claim 8 projection display optical system of claim, wherein: the optical path switching means comprises a surface of a micro-mirror array by a plurality of micro-mirrors formed, the optical path switching means is adjusted by the micromirror array of micro-mirrors in each mirror tilt angle to form different switching patterns.
  12. 12.如权利要求8所述的投影显示器光学系统的投影方法,其特征在于:当该入射光进入该棱镜组时,是先由所遭遇的第一个棱镜的一内表面所形成的反射面反射后再于该棱镜与该间隙的界面处发生全反射。 12. The projection method of claim 8 projection display optical system of claim, wherein: when the incident light enters the prism, the reflecting surface is a first by the inner surface of a prism formed encountered then totally reflected at the interface with the gap in the prism.
CN 03152632 2003-08-01 2003-08-01 Projection display optical system and its projecting method CN1580866A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8052284B2 (en) 2008-04-18 2011-11-08 Qisda Corporation Projector with reduced size and higher contrast
CN102879840A (en) * 2012-10-17 2013-01-16 哈尔滨量具刃具集团有限责任公司 Reflecting prism
CN105403985A (en) * 2015-12-30 2016-03-16 中国华录集团有限公司 Miniaturized TIR prism system for DLP projector
CN105842970A (en) * 2016-05-18 2016-08-10 苏州佳世达光电有限公司 Projector

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8052284B2 (en) 2008-04-18 2011-11-08 Qisda Corporation Projector with reduced size and higher contrast
CN102879840A (en) * 2012-10-17 2013-01-16 哈尔滨量具刃具集团有限责任公司 Reflecting prism
CN102879840B (en) * 2012-10-17 2016-05-04 哈尔滨量具刃具集团有限责任公司 Reflecting prism
CN105403985A (en) * 2015-12-30 2016-03-16 中国华录集团有限公司 Miniaturized TIR prism system for DLP projector
CN105403985B (en) * 2015-12-30 2018-04-20 中国华录集团有限公司 Dlp projector prism system with compact tir
CN105842970A (en) * 2016-05-18 2016-08-10 苏州佳世达光电有限公司 Projector
CN105842970B (en) * 2016-05-18 2018-01-30 苏州佳世达光电有限公司 Projector

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