WO2022134263A1 - 一种投影系统及投影仪 - Google Patents

一种投影系统及投影仪 Download PDF

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Publication number
WO2022134263A1
WO2022134263A1 PCT/CN2021/073785 CN2021073785W WO2022134263A1 WO 2022134263 A1 WO2022134263 A1 WO 2022134263A1 CN 2021073785 W CN2021073785 W CN 2021073785W WO 2022134263 A1 WO2022134263 A1 WO 2022134263A1
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Prior art keywords
light source
led light
projection
projection system
control unit
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PCT/CN2021/073785
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English (en)
French (fr)
Inventor
李文祥
朱炜湛
杨伟樑
高志强
丁明内
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广景视睿科技（深圳）有限公司
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Priority to US17/535,746 priority Critical patent/US20220196994A1/en
Publication of WO2022134263A1 publication Critical patent/WO2022134263A1/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
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • 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
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • 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
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • 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
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • 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 embodiments of the present application relate to the technical field of digital projection display, and in particular, to a projection system and a projector.
  • DLP Digital Light Processing
  • DMD Digital Micromirror Devices
  • the aspect ratio of the projected image is also determined, such as 4:3, 16:9, 16:10, etc.
  • the projected image of the projection plane is low in brightness. For example, in some specific situations, the aspect ratio of the projected image on the desired projection plane is 1:1.
  • the DMD chip of 16:9 is basically used in the projection system, and the corresponding fly-eye lens is also 16:9.
  • the existing technology is used to directly set the aspect ratio of the projected content to 1:1 without making any changes to the fly-eye lens, at this time, since there is no projected content on both sides of the DMD chip, the projection plane will eventually display 3.5 on the left and right sides on the projection plane. Parts are black, so the light hitting both sides of the DMD chip is wasted.
  • the embodiments of the present application provide a projection system and a projector, which can ensure that illumination energy is not wasted when the desired aspect ratio of the projected image is achieved.
  • an embodiment of the present application provides a projection system
  • the projection system includes: a control unit, and a light source, a fly-eye lens, a DMD chip and a projection lens sequentially arranged along an optical path; wherein, the light source is used for A projection light source is provided; the aspect ratio of the fly-eye lens is set to the aspect ratio required for the projected image of the projection plane, and the fly-eye lens is used to receive the projection light source and output the aspect ratio required for the projected image
  • the parallel light is sent to the DMD chip; the DMD chip is used to display the projection content; the projection lens is used to project the projection content to the projection plane; the control unit is connected to the light source and the DMD chip, the control unit is configured to control the light source to work, and send the projection content to the DMD chip.
  • the aspect ratio of the projected content is the same as the aspect ratio of the fly-eye lens.
  • the fly-eye lens has an aspect ratio of 1:1.
  • the light source is a white LED light source.
  • the light source includes a red LED light source, a green LED light source, a blue LED light source, and an excitation blue LED light source; the control unit is respectively connected to the red LED light source, the green LED light source, and the blue LED light source. color LED light source and the excitation blue LED light source.
  • the working modes of the projection system are a full-color working mode and a monochrome working mode; the control unit is further configured to control the red LED light source, the green LED light source, and the blue LED light source Work simultaneously with the exciting blue LED light source, so that the projection system is in the full-color working mode, or control the red LED light source, the green LED light source, the blue LED light source or the One of the blue LED light sources is excited to operate so that the projection system is in the monochromatic operating mode.
  • the projection system further includes a brightness acquisition unit; the brightness acquisition unit is connected to the control unit, and the brightness acquisition unit is configured to acquire brightness information of the projected image and send the brightness information to the control unit; the control unit is further configured to obtain the actual brightness value of the projected image according to the brightness information, and if the actual brightness value is less than the lowest value of the preset brightness value range, increase the output to the The duty ratio of the pulse width modulation signal of the green LED light source is set, so that the actual brightness value of the projected image reaches the preset brightness value range.
  • control unit is further configured to reduce the duty cycle of the pulse width modulation signal when the actual luminance value is higher than the highest value of the preset luminance value range, and output the pulse width modulation signal.
  • a wide modulation signal is given to the green LED light source, so that the actual brightness value of the projected image reaches the preset brightness value range.
  • the projection system further includes an input unit; the input unit is connected to the control unit, and the input unit is configured to receive working mode information selected by a user and send the working mode information to the a control unit; the control unit is configured to control the light source to work according to the working mode information.
  • an embodiment of the present application provides a projector, where the projector includes the projection system according to any one of the above first aspects.
  • the beneficial effects of the embodiments of the present application are: different from the situation in the prior art, the embodiments of the present application provide a projection system and a projector.
  • the projection system includes: a control unit, and a light source, a fly-eye lens, a DMD chip and projection lens; the light source is used to provide the projection light source; the aspect ratio of the fly-eye lens is set to the desired aspect ratio of the projected image, and the fly-eye lens is used to receive the projection light source and output parallel light to the DMD chip; the DMD chip is used for projection The content is displayed; the projection lens is used for projecting the projection content to the projection plane; the control unit connects the light source and the DMD chip, is used for controlling the light source to work, and sends the projection content to the DMD chip.
  • the projection system can ensure that the illumination energy is not wasted when the desired aspect ratio of the projected image is achieved.
  • FIG. 1 is a schematic structural block diagram of a projection system provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural block diagram of another projection system provided by an embodiment of the present application.
  • FIG. 1 is a schematic structural block diagram of a projection system according to an embodiment of the present application.
  • the projection system 100 includes: a control unit 10, a light source 20, a fly-eye lens 30, and a DMD chip 40 sequentially arranged along the optical path. and a projection lens 50; wherein, the light source 20 is used to provide the projection light source; the aspect ratio of the fly-eye lens 30 is set to the aspect ratio required for the projected image of the projection plane, and the fly-eye lens 30 is used to receive the projection light source and output the projected image.
  • the parallel light with the required aspect ratio is sent to the DMD chip 40; the DMD chip 40 is used to display the projection content; the projection lens 50 is used to project the projection content to the projection plane; the control unit 10 connects the light source 20 and the DMD chip 40, the control unit 10 is used for controlling the working of the light source 20 and sending the projection content to the DMD chip 40 .
  • the light emitted from the light source 20 can be limited to a certain area, that is, the light output to the DMD chip 40 can be limited It is adjusted to be within the required aspect ratio range of the projected image, so that the aspect ratio of the projection plane can be adjusted to the required aspect ratio, and at the same time, the light of the light source 20 is all focused on the center of the DMD chip 40 through the fly-eye lens 30 Therefore, the illuminance of the projected content is improved, and finally the brightness of the projected image is improved. In this way, the light energy of the light source 20 is not lost, and the power consumption of the projection system 100 is reduced.
  • the control unit 10 will process the projected content to adapt to the aspect ratio of the fly-eye lens 30, which will cause the loss of the projected content.
  • the aspect ratio of the projected content is consistent with the aspect ratio of the fly-eye lens 30, so that not only the projected content can be completely It is presented on the projection plane, and the utilization rate of the light energy irradiated on the DMD chip 40 through the fly-eye lens 30 can reach 100%, without causing waste of energy.
  • the aspect ratio of the fly-eye lens 30 when the aspect ratio of the desired projected image is 1:1, the aspect ratio of the fly-eye lens 30 is 1:1, and the aspect ratio of the DMD chip 40 is 16:9 At the same time, the aspect ratio of the projected content is 1:1.
  • the fly-eye lens 30 is not changed. In the case of equal light energy, the fly-eye lens 30 is used to concentrate the light energy in the desired aspect ratio of the projected image. Within the range of , the irradiation area irradiated on the DMD chip 40 is reduced, thereby improving the illumination of the light source 20 as a whole, finally improving the brightness of the projected image, and improving the utilization rate of light energy.
  • the aspect ratio of the fly-eye lens 30 only needs to be set to a desired aspect ratio, which does not need to be limited to the limitations in the embodiments of the present application.
  • the light source 20 is a white LED light source.
  • the light source 20 includes a red LED light source 21 , a green LED light source 22 , a blue LED light source 23 , and an excited blue LED light source 24 ;
  • the control unit 10 is respectively connected to the red LED light source 21 , the green LED light source 22 , the blue LED light source 23 and the excitation blue LED light source 24 .
  • the light conversion rate of the green LED light source 22 is the highest, up to 110lm/W
  • the light conversion rate of the red LED light source 21 is 34lm/W
  • the light conversion rate of the blue LED light source 23 is the lowest, 22lm/W. It can be seen that the light conversion rate of the blue LED light source 23 is low, so an excitation blue LED light source 24 needs to be added.
  • the working modes of the projection system 100 are full-color working mode and monochrome working mode; the control unit 10 is further configured to control the red LED light source 21 , the green LED light source 22 , the The blue LED light source 23 and the excitation blue LED light source 24 work simultaneously, so that the projection system 100 is in the full-color working mode, or the red LED light source 21 and the green LED light source 22 are controlled. , one of the blue LED light sources 23 or the excited blue LED light sources 24 works, so that the projection system 100 is in the monochromatic working mode.
  • red LED light source 21 is about 31%
  • green LED light source 22 and blue LED light source 23 are about 26%
  • blue LED light source 24 is excited only 5%. Therefore, the actual light conversion rate of the green LED light source 22 is about 28.6lm/W
  • the actual light conversion rate of the red LED light source 21 is about 10.54lm/W
  • the actual light conversion rate of the blue LED light source 23 is about 5.72lm/W .
  • the actual light conversion rate of the excited blue LED light source 24 is about 1.1lm/W.
  • the overall light conversion rate is 11.49lm/W, which can be seen. At this time, the projected brightness of the projected image is low.
  • the projection system 100 further includes a brightness acquisition unit; the brightness acquisition unit is connected to the control unit 10, and the brightness acquisition unit is used to acquire the brightness information of the projected image of the projection plane , and send the brightness information to the control unit 10; the control unit 10 is further configured to obtain the actual brightness value of the projected image according to the brightness information, if the actual brightness value is less than the lowest value of the preset brightness value range, adjust the Increase the duty cycle of the pulse width modulation signal output to the green LED light source 22, thereby improving the brightness of the projected image, so that the actual brightness value of the projected image reaches the preset brightness value range; if the actual brightness value is higher than the preset brightness value When the maximum value of the range is reached, the duty cycle of the pulse width modulation signal output to the green LED light source 22 is reduced, thereby reducing the brightness of the projected image, so that the actual brightness value of the projected image reaches the preset brightness value range. Since the actual light conversion rate of the green LED light source 22 is
  • the projection system 100 can directly adopt the green light monochromatic working mode, so that only the green LED light source 22 works. Since the actual conversion rate of the green LED light source 22 is the highest, in contrast to using four LED light sources to work at the same time, when the brightness is equal, the green light monochromatic working mode can be adjusted by the control unit 10 to increase the pulse width modulation output to the green LED light source 22
  • the duty cycle of the signal is used to reduce the power, which can greatly save the power consumption of the projection system 100 . For example, assuming that the power of each LED light source in the projection system 100 is 5W and the total power is 20W, combined with the actual conversion rate of each LED light source, the final brightness of the projection system 100 is 229.8lm.
  • the power can be increased to 8W by increasing the duty ratio of the green LED light source 22.
  • the final brightness of the projection system 100 is 228.8lm, which is equivalent to that of 4 lamps working at the same time, but The power is only 40% of when 4 lamps work at the same time; if the power of the green LED light source 22 is increased to 10W, the brightness of the projected image is 286lm, which is significantly higher than the brightness when 4 lamps work at the same time, but the power of the projection system 100 is only Half of the time when 4 lights work at the same time. It can be seen that this method can greatly save the energy consumption of the projection system 100, and can also reduce the size and complexity of the heat dissipation module subsequently.
  • the projection system 100 further includes an input unit; the input unit is connected to the control unit 10, and the input unit is used to receive the work selected by the user. mode information, and send the working mode information to the control unit 10; the control unit 10 is further configured to control the light source to work according to the working mode information.
  • the input unit may be a touch display screen, a mouse, a keyboard, a key, or any other suitable module that can be used to input information, which is not limited herein.
  • an embodiment of the present application further provides a projector, where the projector includes the projection system according to any one of the above.
  • the projection system can ensure that the illumination energy is not wasted when the required aspect ratio of the projected image is achieved.
  • the embodiments of the present application provide a projection system and a projector, the projection system includes: a control unit, a light source, a fly-eye lens, a DMD chip and a projection lens sequentially arranged along an optical path; the light source is used to provide a projection light source; the width of the fly-eye lens is The aspect ratio is set to the required aspect ratio of the projected image.
  • the fly-eye lens is used to receive the projection light source and output parallel light to the DMD chip; the DMD chip is used to display the projected content; the projection lens is used to project the projected content to the projection plane; control The unit connects the light source and the DMD chip, and is used to control the work of the light source and send the projection content to the DMD chip.
  • the device embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physically separated unit, that is, it can be located in one place, or it can be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

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  • General Physics & Mathematics (AREA)
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Abstract

一种投影系统及投影仪。投影系统（100）包括：控制单元（10）、以及依次沿光路设置的光源（20）、复眼透镜（30）、DMD芯片（40）和投影镜头（50）；光源（20）用于提供投影光源；复眼透镜（30）的宽高比设置为投影图像所需宽高比，复眼透镜（30）用于接收投影光源并输出平行光至DMD芯片（40）；DMD芯片（40）用于对投影内容进行显示；投影镜头（50）用于将投影内容投影至投影平面；控制单元（10）连接光源（20）和DMD芯片（40）、用于控制光源（20）工作以及将投影内容发送至DMD芯片（40）。通过将复眼透镜（30）的宽高比设置为投影图像所需的宽高比，能保证在实现所需投影图像的宽高比的情况下，不浪费照明能量。

Description

一种投影系统及投影仪
相关申请的交叉参考
本申请要求于2020年12月23日提交中国专利局，申请号为202011535606.7，发明名称为“一种投影系统及投影仪”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及数字投影显示技术领域，特别涉及一种投影系统及投影仪。
背景技术
近年来，随着半导体显示技术的快速发展，投影技术发展迅速，市面上已出现多种各式各样的投影机。投影机的核心部件——投影光机大多基于数字光处理(Digital Light Processing,DLP)技术，投影图像的分辨率由数字微镜器件(Digital Micromirror Devices,DMD)决定，例如854*480、1920*1080等，此时，投影图像的宽高比也因此确定，如4:3、16:9、16:10等。
在实现本申请的过程中，申请人发现：如果需要投影宽高比不同于DMD芯片宽高比的图像，目前一般采用软件方法，即直接投影所需宽高比的图像。此时，DMD芯片上的微反射镜仍然会全部工作，投影光机的LED光源的出射光会覆盖DMD芯片所有微反射镜，但仅部分区域会投射图像，此时会造成照明能量的浪费，投影平面的投影图像亮度较低。例如，在一些特定的场合下，期望的投影平面上的投影图像的宽高比为1：1，一般投影系统中基本都采用16：9的DMD芯片，对应的复眼透镜也为16：9，当采用现有技术直接将投影内容的宽高比设定为1：1，不对复眼透镜做任何改变，此时因DMD芯片两侧无投影内容，最终在投影平面上会呈现左右两侧各3.5部分是黑色的，这样照射在DMD芯片两侧的光线造成浪费。
发明内容
针对现有技术的上述缺陷，本申请实施例提供一种投影系统及投影仪，能保证在实现所需投影图像的宽高比的情况下，不浪费照明能量。
为了解决上述技术问题，本申请实施例提供了一种投影系统，所述投影系统包括：控制单元、以及依次沿光路设置的光源、复眼透镜、DMD芯片和投影镜头；其中，所述光源用于提供投影光源；所述复眼透镜的宽高比设置为投影平面的投影图像所需的宽高比，所述复眼透镜用于接收所述投影光源，并输出所述投影图像所需的宽高比的平行光至所述DMD芯片；所述DMD芯片用于对投影内容进行显示；所述投影镜头用于将所述投影内容投影至所述投影平面；所述控制单元连接所述光源和所述DMD芯片，所述控制单元用于控制所述光源工作，以及将所述投影内容发送至所述DMD芯片。
在一些实施例中，所述投影内容的宽高比和所述复眼透镜的宽高比一致。
在一些实施例中，所述复眼透镜的宽高比为1：1。
在一些实施例中，所述光源为白色LED光源。
在一些实施例中，所述光源包括红色LED光源、绿色LED光源、蓝色LED光源、激发蓝色LED光源；所述控制单元分别连接所述红色LED光源、所述绿色LED光源、所述蓝色LED光源和所述激发蓝色LED光源。
在一些实施例中，所述投影系统的工作模式为全彩色工作模式和单色工作模式；所述控制单元还用于控制所述红色LED光源、所述绿色LED光源、所述蓝色LED光源和所述激发蓝色LED光源同时进行工作，以使所述投影系统处于所述全彩色工作模式，或者，控制所述红色LED光源、所述绿色LED光源、所述蓝色LED光源或所述激发蓝色LED光源的其中一种LED光源工作，以使所述投影系统处于所述单色工作模式。
在一些实施例中，所述投影系统还包括亮度采集单元；所述亮度采集单元连接所述控制单元，所述亮度采集单元用于采集所述投影图像的亮度信息，并将所述亮度信息发送至所述控制单元；所述控制单元还用于根据所述亮度信息获得所述投影图像的实际亮度值，如果所述实际亮度值小于预设亮度值范围的最低值时，调高输出给所述绿色LED光源的脉宽调制信号的占空比，以使所述投影图像的实际亮度值达到所述预设亮度值范围。
在一些实施例中，所述控制单元还用于在所述实际亮度值高于所述预设亮度值范围的最高值时，降低所述脉宽调制信号的占空比，并输出所述脉宽调制信号给所述绿色LED光源，以使所述投影图像的实际亮度值达到所述预设亮度值范围。
在一些实施例中，所述投影系统还包括输入单元；所述输入单元连接所述控制单元，所述输入单元用于接收用户选择的工作模式信息，并将所述工作模式信息发送给所述控制单元；所述控制单元用于根据所述工作模式信息，控制所述光源进行工作。
为解决上述技术问题，第二方面，本申请实施例中提供了一种投影仪，所述投影仪包括如上述第一方面任一项所述的投影系统。
本申请实施方式的有益效果是：区别于现有技术的情况，本申请实施例提供一种投影系统及投影仪，所述投影系统包括：控制单元、以及依次沿光路设置的光源、复眼透镜、DMD芯片和投影镜头；光源用于提供投影光源；复眼透镜的宽高比设置为投影图像所需宽高比，复眼透镜用于接收投影光源并输出平行光至DMD芯片；DMD芯片用于对投影内容进行显示；投影镜头用于将投影内容投影至投影平面；控制单元连接光源和DMD芯片、用于控制光源工作以及将投影内容发送至DMD芯片。该投影系统通过将复眼透镜的宽高比设置为投影图像所需的宽高比，能保 证在实现所需投影图像的宽高比的情况下，不浪费照明能量。
附图说明
一个或多个实施例中通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件/模块和步骤表示为类似的元件/模块和步骤，除非有特别申明，附图中的图不构成比例限制。
图1是本申请实施例提供的一种投影系统的结构框图示意图；
图2是本申请实施例提供的另一种投影系统的结构框图示意图。
具体实施方式
下面结合具体实施例对本申请进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本申请，但不以任何形式限制本申请。应当指出的是，对本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进。这些都属于本申请的保护范围。
为了便于理解本申请，下面结合附图和具体实施例，对本申请进行更详细的说明。除非另有定义，本说明书所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是用于限制本申请。本说明书所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
需要说明的是，如果不冲突，本申请实施例中的各个特征可以相互结合，均在本申请的保护范围之内。另外，虽然在装置示意图中进行了 功能模块划分，但是在某些情况下，可以以不同于装置中的模块划分。此外，本文所采用的“第一”、“第二”等字样并不对数据和执行次序进行限定，仅是对功能和作用基本相同的相同项或相似项进行区分。
请参阅图1，图1为本申请实施例提供的一种投影系统的结构框图示意图，所述投影系统100包括：控制单元10、以及依次沿光路设置的光源20、复眼透镜30、DMD芯片40和投影镜头50；其中，光源20用于提供投影光源；复眼透镜30的宽高比设置为投影平面的投影图像所需的宽高比，复眼透镜30用于接收投影光源，并输出投影图像所需的宽高比的平行光至DMD芯片40；DMD芯片40用于对投影内容进行显示；投影镜头50用于将投影内容投影至投影平面；控制单元10连接光源20和DMD芯片40，控制单元10用于控制所述光源20工作，以及将所述投影内容发送至所述DMD芯片40。
在该投影系统100中，通过将复眼透镜30的宽高比设置为投影图像所需的宽高比，能够将光源20的出射光限定在一定区域，即能够将输出给DMD芯片40上的光调整为投影图像所需的宽高比范围之内，从而能将投影平面的宽高比调整为所需的宽高比，同时由于光源20的光通过复眼透镜30全都聚焦于DMD芯片40的中心部分，从而提升了投影内容的照度，最终提高了投影图像的亮度，这样，光源20的光能没有损失，减少了投影系统100的功耗。
如果投影内容的宽高比超出了复眼透镜30的宽高比，则控制单元10会对投影内容进行处理以适应复眼透镜30的宽高比，这样会造成投影内容的丢失。为了减少投影内容的信息丢失以及提高能量的利用率，在其中一些实施例中，所述投影内容的宽高比和所述复眼透镜30的宽高比一致，这样，不仅能够将投影内容完整地呈现在投影平面上，而且 能让通过复眼透镜30照射在DMD芯片40上的光能利用率达到100％，不造成能量的浪费。
具体地，在其中一些实施例中，所需投影图像的宽高比为1：1时，则所述复眼透镜30的宽高比为1：1，DMD芯片40的宽高比为16：9，同时投影内容宽高比为1：1，对比现有技术对复眼透镜30不做更改，在光能相等的情况下，此时通过复眼透镜30将光能集中在投影图像所需宽高比的范围内，减小了照射在DMD芯片40上的照射面积，从而整体上提升了光源20的照度，最终提升了投影图像的亮度，提高了光能的利用率。在实际应用中，复眼透镜30的宽高比只需要设置成所需宽高比即可，在此不需拘泥于本申请实施例中的限定。
当投影图像仅需要呈现灰度图像时，在其中一些实施例中，所述光源20为白色LED光源。
在当投影图像需要呈现彩色图像时，在其他一些实施例中，请参阅图2，所述光源20包括红色LED光源21、绿色LED光源22、蓝色LED光源23、激发蓝色LED光源24；并且控制单元10分别连接红色LED光源21、绿色LED光源22、蓝色LED光源23和激发蓝色LED光源24。一般情况下，绿色LED光源22的光转化率最高，可达110lm/W，红色LED光源21的光转化率为34lm/W，蓝色LED光源23的光转化率最低，为22lm/W。可见，蓝色LED光源23的光转化率低，因此需要增加一个激发蓝色LED光源24，激发蓝色LED光源24能让激光照射在LED的蓝色荧光粉层并发出蓝光。
在其中一些实施例中，所述投影系统100的工作模式为全彩色工作模式和单色工作模式；所述控制单元10还用于控制所述红色LED光源21、所述绿色LED光源22、所述蓝色LED光源23和所述激发蓝色LED光源24同时进行工作，以使所述投影系统100处于所述全彩色工作模 式，或者，控制所述红色LED光源21、所述绿色LED光源22、所述蓝色LED光源23或所述激发蓝色LED光源24的其中一种LED光源工作，以使所述投影系统100处于所述单色工作模式。
然而，由于投影系统100中每个LED光源的效率不同，红色LED光源21约为31％，绿色LED光源22和蓝色LED光源23约为26％，激发蓝色LED光源24仅为5％。因此，绿色LED光源22实际的光转化率约为28.6lm/W、红色LED光源21实际的光转化率约为10.54lm/W、蓝色LED光源23实际的光转化率约为5.72lm/W、激发蓝色LED光源24实际的光转化率约为1.1lm/W。当4个LED光源功率相同，则整体的光转化率为11.49lm/W，可见，此时投影图像的投影亮度较低。
为了提高投影图像的投影亮度，在其中一些实施例中，所述投影系统100还包括亮度采集单元；亮度采集单元连接所述控制单元10，亮度采集单元用于采集投影平面的投影图像的亮度信息，并将所述亮度信息发送至所述控制单元10；控制单元10还用于根据所述亮度信息获得投影图像的实际亮度值，如果实际亮度值小于预设亮度值范围的最低值，则调高输出给绿色LED光源22的脉宽调制信号的占空比，从而提高投影图像的亮度，使投影图像的实际亮度值达到所述预设亮度值范围；如果实际亮度值高于预设亮度值范围的最高值时、，则降低输出给绿色LED光源22的脉宽调制信号的占空比，从而降低投影图像的亮度，使投影图像的实际亮度值达到所述预设亮度值范围。因为绿色LED光源22的实际光转化率是最高的，因此通过增大或减小输出给LED光源的脉宽调制信号的占空比，能够增加或降低投影图像的亮度。
为了在提高亮度的同时能够降低功耗，所述投影系统100可以直接采用绿灯单色工作模式，这样仅有绿色LED光源22工作。由于绿色LED光源22的实际转化率最高，对比使用四个LED光源同时工作时，在亮 度相等的情况时，绿灯单色工作模式可以通过控制单元10调高输出给绿色LED光源22的脉宽调制信号的占空比，来降低功率，这样能极大地节省投影系统100的能耗。例如，假设投影系统100中每个LED光源的功率为5W，总功率为20W，结合每个LED光源的实际转化率，则投影系统100的最终亮度为229.8lm。而如果只使用绿色LED光源22，通过提高绿色LED光源22的占空比，能够将功率增大至8W，此时投影系统100的最终亮度为228.8lm，亮度与4灯同时工作时相当，但是功率仅为4灯同时工作时的40％；如果将绿色LED光源22功率提高至10W，则投影图像的亮度为286lm，显著高于4灯同时工作时的亮度，但是投影系统100的功率仅为4灯同时工作时的一半。由此可见，该方式能够极大节省投影系统100能耗，后续也可以降低散热模块的大小和复杂度。
为了方便用户切换投影系统100的工作模式、提升用户的体验感，在其中一些实施例中，所述投影系统100还包括输入单元；输入单元连接控制单元10，输入单元用于接收用户选择的工作模式信息，并将所述工作模式信息发送给控制单元10；控制单元10还用于根据所述工作模式信息，控制所述光源进行工作。在实际应用中，输入单元可以是触摸显示屏、鼠标、键盘、按键或者是其他一切合适的可用于输入信息的模块，在此不做限定。
为解决上述技术问题，本申请实施例还提供了一种投影仪，所述投影仪包括如上述任一项所述的投影系统。该投影系统通过将复眼透镜的宽高比设置为投影图像所需的宽高比，能保证在实现所需投影图像的宽高比的情况下，不浪费照明能量。
本申请实施例提供一种投影系统及投影仪，所述投影系统包括：控制单元、以及依次沿光路设置的光源、复眼透镜、DMD芯片和投影镜头；光源用于提供投影光源；复眼透镜的宽高比设置为投影图像所需宽高 比，复眼透镜用于接收投影光源并输出平行光至DMD芯片；DMD芯片用于对投影内容进行显示；投影镜头用于将投影内容投影至投影平面；控制单元连接光源和DMD芯片、用于控制光源工作以及将投影内容发送至DMD芯片。该投影系统通过将复眼透镜的宽高比设置为投影图像所需的宽高比，能保证在实现所需投影图像的宽高比的情况下，不浪费照明能量。
需要说明的是，以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；在本申请的思路下，以上实施例或者不同实施例中的技术特征之间也可以进行组合，步骤可以以任意顺序实现，并存在如上所述的本申请的不同方面的许多其它变化，为了简明，它们没有在细节中提供；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (10)

  1. 一种投影系统，其特征在于，所述投影系统包括：控制单元、以及依次沿光路设置的光源、复眼透镜、DMD芯片和投影镜头；
    其中，所述光源用于提供投影光源；
    所述复眼透镜的宽高比设置为投影平面的投影图像所需的宽高比，所述复眼透镜用于接收所述投影光源，并输出所述投影图像所需的宽高比的平行光至所述DMD芯片；
    所述DMD芯片用于对投影内容进行显示；
    所述投影镜头用于将所述投影内容投影至所述投影平面；
    所述控制单元连接所述光源和所述DMD芯片，所述控制单元用于控制所述光源工作，以及将所述投影内容发送至所述DMD芯片。
  2. 根据权利要求1所述的投影系统，其特征在于，所述投影内容的宽高比和所述复眼透镜的宽高比一致。
  3. 根据权利要求1所述的投影系统，其特征在于，所述复眼透镜的宽高比为1：1。
  4. 根据权利要求2所述的投影系统，其特征在于，所述光源为白色LED光源。
  5. 根据权利要求2所述的投影系统，其特征在于，所述光源包括红色LED光源、绿色LED光源、蓝色LED光源、激发蓝色LED光源；所述控制单元分别连接所述红色LED光源、所述绿色LED光源、所述蓝色 LED光源和所述激发蓝色LED光源。
  6. 根据权利要求4所述的投影系统，其特征在于，所述投影系统的工作模式为全彩色工作模式和单色工作模式；
    所述控制单元还用于控制所述红色LED光源、所述绿色LED光源、所述蓝色LED光源和所述激发蓝色LED光源同时进行工作，以使所述投影系统处于所述全彩色工作模式，或者，控制所述红色LED光源、所述绿色LED光源、所述蓝色LED光源或所述激发蓝色LED光源的其中一种LED光源工作，以使所述投影系统处于所述单色工作模式。
  7. 根据权利要求5所述的投影系统，其特征在于，所述投影系统还包括亮度采集单元；
    所述亮度采集单元连接所述控制单元，所述亮度采集单元用于采集所述投影图像的亮度信息，并将所述亮度信息发送至所述控制单元；
    所述控制单元还用于根据所述亮度信息获得所述投影图像的实际亮度值，在所述实际亮度值小于预设亮度值范围的最低值时，调高输出给所述绿色LED光源的脉宽调制信号的占空比，以使所述投影图像的实际亮度值达到所述预设亮度值范围。
  8. 根据权利要求7所述的投影系统，其特征在于，所述控制单元还用于在所述实际亮度值高于所述预设亮度值范围的最高值时，降低所述脉宽调制信号的占空比，并输出所述脉宽调制信号给所述绿色LED光源，以使所述投影图像的实际亮度值达到所述预设亮度值范围。
  9. 根据权利要求5所述的投影系统，其特征在于，所述投影系统 还包括输入单元；
    所述输入单元连接所述控制单元，所述输入单元用于接收用户选择的工作模式信息，并将所述工作模式信息发送给所述控制单元；
    所述控制单元用于根据所述工作模式信息，控制所述光源进行工作。
  10. 一种投影仪，其特征在于，所述投影仪包括如权利要求1-9任一项所述的投影系统。
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