CN111812934A - Single right-angle prism LED micro projection lighting system - Google Patents
Single right-angle prism LED micro projection lighting system Download PDFInfo
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- CN111812934A CN111812934A CN202010899923.0A CN202010899923A CN111812934A CN 111812934 A CN111812934 A CN 111812934A CN 202010899923 A CN202010899923 A CN 202010899923A CN 111812934 A CN111812934 A CN 111812934A
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- light source
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- dichroic mirror
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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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser 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
- G03B21/005—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
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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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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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
- G03B21/206—Control of light source other than position or intensity
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Projection Apparatus (AREA)
Abstract
The invention provides a single right-angle prism LED micro projection lighting system, which belongs to the technical field of micro projection display and comprises an R light source, a G light source, a B light source and a BP light source, wherein the BP light source reaches a fluorescent powder emission surface of the G light source through a first lens group, a first dichroic mirror and a second lens group, and reaches a light homogenizing mechanism together with the G light source through the second lens group, the first dichroic mirror, a third collimating lens and a second dichroic mirror by being excited by fluorescent powder; the light source B reaches the light homogenizing mechanism through the third lens group, the first dichroic mirror, the third collimating lens and the second dichroic mirror; the R light source reaches the light uniformizing mechanism through the fourth lens group and the second dichroic mirror; the first lens group, the second lens group, the third lens group and the fourth lens group respectively comprise a first collimating lens and a second collimating lens which are sequentially arranged along the incident direction of the light source, and the light source output by the dodging mechanism sequentially reaches the DMD through the relay lens group and the single right-angle prism. The single-right-angle prism LED miniature projection illumination system can reduce the volume and improve the brightness and efficiency.
Description
Technical Field
The invention belongs to the technical field of micro projection display, and particularly relates to a single right-angle prism LED micro projection lighting system.
Background
As the development of the projection technology is continued,
with the rapid development of scientific technology and the explosive growth of information, the display technology has more and more important function for improving the information acquisition and processing capability of people, the requirement on the size of the projector is higher and higher, the projector gradually develops towards miniaturization, and the development and maturity of LED and DLP technologies accelerate the miniaturization process of the projector. The appearance of high brightness and small volume of LED, and the maturity of DLP technology, make DLP micro projector using high brightness LED as Light source have good development prospect, more and more terminal customers select the product using American TI company DLP ((Digital Light processing) technology as core, TI has promoted miniaturized 0.33DMD (Digital micro device), this requires that the lighting system also keeps pace with the time, makes the volume smaller, and efficiency is higher, and brightness is high.
The patent document with publication number CN201965317U provides a micro DLP projector capable of mounting a large-size lens, which comprises an LED light source, a light-collecting lens, a spectroscope, a fly-eye lens, a field lens, a reflector, a wedge prism, a right-angle prism, a DMD and a lens, wherein the LED light source of the projector sequentially passes through the light-collecting lens, the spectroscope, the fly-eye lens and the field lens and then enters into the reflector arranged at an angle of 45 degrees with the main optical axis direction, the light reflected by the reflector enters into the DMD through the wedge prism, the light reflected by the DMD enters into the lens of the projector after being reflected by the right-angle prism, and finally the lens of the projector emits the emergent light with the same light-emitting direction as the LED light source of the projector after passing through the fly-eye lens, so as to form a right-angle. According to this utility model light path design's miniature DLP projector can the place ahead install more easily and use wide-angle lens or the camera lens of great diameter, but this projector luminance is lower, remains further to improve.
Patent document CN101950083A provides an LED illumination light path for a projector. The illumination light path includes: the LED light source comprises a first LED light source, a second LED light source, a third LED light source, a first lens group, a second lens group, a third lens group, a first dichroic mirror, a second dichroic mirror and a fourth lens group, wherein the first lens group, the second lens group and the third lens group are used for converging the near parallel light of the first lens group and the second lens group into near parallel light respectively, the second dichroic mirror is used for converging the combined light obtained by the first dichroic mirror and the parallel light of the third lens group into light spots, in addition, the first lens group and the second lens group have the same optical path length and adopt the same lens group, the optical path length of the third lens group is smaller than that of the first lens group or the second lens group, and the light spots converged by the fourth lens group emitted by the first lens group, the second lens group and the third lens group are better in consistency. The color uniformity of the light spots after light combination is good, so that the color uniformity of the projector is improved to a certain degree. The invention needs to be further improved for the projection brightness.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a single-right-angle prism LED micro projection illumination system, which reduces the volume and improves the output brightness and efficiency of light.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a single right-angle prism LED micro projection lighting system comprises an R light source, a G light source, a B light source and a BP light source, wherein the BP light source reaches a fluorescent powder emission surface of the G light source through a first lens group, a first dichroic mirror and a second lens group, and reaches a light uniformizing mechanism together with the G light source through the second lens group, the first dichroic mirror, a third collimating lens and a second dichroic mirror by being excited by fluorescent powder; the light source B reaches the light homogenizing mechanism through the third lens group, the first dichroic mirror, the third collimating lens and the second dichroic mirror; the R light source reaches the light uniformizing mechanism through the fourth lens group and the second dichroic mirror; the first lens group, the second lens group, the third lens group and the fourth lens group respectively comprise a first collimating lens and a second collimating lens which are sequentially arranged along the incident direction of the light source, and the light source output by the dodging mechanism sequentially reaches the DMD through the relay lens group and the single right-angle prism.
Preferably, the relay lens group includes a first relay lens and a second relay lens.
Preferably, the optical axis of the G light source is a main optical axis, and the angles formed by the optical axes of the BP light source, the B light source and the R light source and the main optical axis are acute angles.
Preferably, the first dichroic mirror, the third collimating lens, the second dichroic mirror, the light uniformizing mechanism, the first relay lens, the second relay lens and the single-right-angle prism are sequentially arranged on the main optical axis.
Preferably, the first dichroic mirror is a blue-reflecting red-green dichroic mirror.
Preferably, the second dichroic mirror is a red-reflecting blue-green dichroic mirror.
Preferably, the light uniformizing mechanism is a fly eye lens.
The DLP projection system using the traditional light source generally adopts a light source with an ellipsoidal light reflecting bowl and a square rod illumination system, the incident end of the square rod is positioned on the focus of an ellipsoidal lamp, light energy emitted by the light source forms uniform rectangular distribution on the emergent end of the square rod after being reflected for multiple times in the square rod, and then the emergent end of the square rod is imaged on the surface of a DMD by an illumination lens group to form a proper illumination light spot. The illuminating light is modulated and reflected by the DMD and then is imaged on a screen through a projection objective. The light source is one of the main components of a projection display system, and the projection display system has very high requirements on output luminous flux, luminous spectral distribution, color temperature, stability, volume, service life and the like of the used light source. First, the projection light source must be able to provide sufficient luminous flux within a given etendue to meet the brightness requirements of the system. Secondly, the light emission spectrum of the light source must be adapted to the color requirements of the observer, and the energy utilization of the system is also affected. For example, current projection display systems all use R, G, B as the three primary colors, and light energy corresponding to yellow and cyan wavelength bands is filtered by the subsequent optical system to ensure the purity of system colors. It is therefore desirable that the energy emitted by the light source is as concentrated as possible in the respective red, green and blue spectral ranges. Although the DLP projection equipment generally adopts the LED light source at present, the service life, the cost and the like of the light source are obviously improved, the LED light source is generally still in the interval of 600-800 lumens in the application of the DLP, and the insufficient brightness becomes a key factor restricting the development of the DLP projection equipment.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the invention provides a single right-angle prism LED micro projection lighting system which is used for a screen-free television, and the light emitting efficiency of green light is improved by adding a BP system and outputting the excitation effect of blue light on a green LED, so that the brightness of the green light is improved by more than 38%, and finally the brightness of a projection picture can be improved by more than 25%.
Secondly, the invention adopts the design scheme of a single right-angle prism, reduces the volume of the existing product, and the volume of the improved product is 71.5 x 33.25 x 15mm, and is reduced by more than 8%.
And thirdly, the first dichroic mirror and the second dichroic mirror are reasonably designed, the first dichroic mirror adopts a blue-reflecting red-green-transmitting dichroic mirror, and the second dichroic mirror adopts a red-reflecting blue-green-transmitting dichroic mirror, so that the brightness and the color gamut coverage rate are obviously improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1: the invention relates to an optical system diagram of a single right-angle prism LED micro projection illumination system;
FIG. 2: an optical system G based on ZEMAX software projects a picture spot diagram on the DMD effective surface and 80 inches;
FIG. 3: an optical system R light based on ZEMAX software projects a picture spot diagram on the DMD effective surface and 80 inches;
FIG. 4: an optical system B based on ZEMAX software projects a picture spot diagram on the DMD effective surface and 80 inches;
FIG. 5: an optical system BP light spot diagram on a G luminous surface based on ZEMAX software;
the light source comprises a 1-R light source, a 2-G light source, a 3-B light source, a 4-BP light source, a 5-first lens group, a 6-first dichroic mirror, a 7-second lens group, a 8-third collimating lens, a 9-second dichroic mirror, a 10-dodging mechanism, a 11-third lens group, a 12-fourth lens group, a 13-first collimating lens, a 14-second collimating lens, a 15-first relay lens, a 16-second relay lens, a 17-single right-angle prism and a 18-DMD.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Referring to fig. 1, a single right-angle prism 17LED micro projection illumination system includes an R light source 1, a G light source 2, a B light source 3, and a BP light source 4, where the BP light source 4 reaches a phosphor emission surface of the G light source 2 through a first lens group 5, a first dichroic mirror 6, and a second lens group 7, and reaches a light uniformizing mechanism 10 together with the G light source 2 through the second lens group 7, the first dichroic mirror 6, a third collimating lens 8, and a second dichroic mirror 9 by excitation of phosphor; the B light source 3 reaches the light uniformizing mechanism 10 through the third lens group 11, the first dichroic mirror 6, the third collimating lens 8 and the second dichroic mirror 9; the R light source 1 reaches the dodging mechanism 10 through the fourth lens group 12 and the second dichroic mirror 9; the first lens group 5, the second lens group 7, the third lens group 11 and the fourth lens group 12 each include a first collimating lens 13 and a second collimating lens 14 which are sequentially arranged along the incident direction of the light source, and the light source output by the dodging mechanism 10 sequentially reaches the DMD18 through the relay lens group and the single-right-angle prism 17.
Wherein, R light source 1 is the red light source, G light source 2 is the green glow light source, B light source 3 is the Blue light source, BP light source 4 is for being sent out by Blue pumping device, and the output light of Blue Pumping (BP) is Blue light, and the effect is that the phosphor powder of the green light source of excitation is luminous, makes the green glow light source luminance higher.
The optical axis of the G light source 2 is a main optical axis, and the included angles between the optical axes of the BP light source 4, the B light source 3 and the R light source 1 and the main optical axis are acute angles. Specifically, the angles formed by the optical axis of the BP light source 4 and the main optical axis are both 92 degrees; the angle between the optical axis of the B light source 3 and the main optical axis is 88 degrees, and the angle between the optical axis of the R light source 1 and the main optical axis is 89 degrees, so that the utilization rate of the light source is remarkably improved.
The third collimating lens 8 is arranged perpendicularly with respect to the main optical axis.
The first lens group 5 converts the light beam emitted by the BP light source 4 into a parallel collimated light beam;
the second lens group 7 converts the light beam emitted by the G light source 2 into a parallel collimated light beam;
the third lens group 11 converts the light beam emitted by the B light source 3 into a parallel collimated light beam;
the fourth lens group 12 converts the light beam emitted by the R light source 1 into a parallel collimated light beam;
first dichroic mirror 6 is the red green dichroic mirror is passed through to the anti-blue, and its effect is: reflects blue light, transmits red and green light, and is disposed obliquely with respect to the main optical axis.
Second dichroic mirror 9 is anti red blue and green dichroic mirror that passes through, and its effect is: reflects red light, transmits blue and green light, and is disposed obliquely with respect to the main optical axis.
The light uniformizing mechanism 10 is a fly-eye lens, and is used for improving light uniformity and brightness. Compound eye detailed parameters: compound eye cell R1=1.65, R2= -1.65, 14 columns × 11 rows.
The relay lens group includes a first relay lens 15 and a second relay lens 16 for receiving the light beam output by the fly-eye lens and imaging the exit end face of the fly-eye lens on the DMD 18. The first relay lens 15 and the second relay lens 16 are aspheric lenses, and are made of plastic lenses, and the specific parameters are as follows:
the single right-angle prism 17 is used to change the output direction of the optical path, so that the light beam output by the second relay lens 16 is imaged onto the DMD18, the prism angles are 45 °, 90 ° and 45 °, respectively, and the angle with the incident direction of the main optical axis is 48.75 °. The angle of the prism is calculated in detail to ensure that the illumination beam is totally reflected at the surface, while the bright-state outgoing beam does not meet the total reflection condition at the surface and is transmitted.
The first dichroic mirror 6, the third collimating lens 8, the second dichroic mirror 9, the fly-eye lens, the first relay lens 15, the second relay lens 16 and the single-right-angle prism 17 are sequentially arranged on the main optical axis.
The single-right-angle prism 17LED micro projection lighting system provided by the invention is used for a screen-free television, and the emission efficiency of green light is improved by adding a BP system and outputting the excitation effect of blue light on a green LED, so that the brightness of the green light is improved by more than 38%, and finally the brightness of a projection picture can be improved by more than 25%. Where brightness refers to the amount of light emitted per unit area per unit solid angle.
FIG. 2 shows a diagram of the optical system G light spot based on ZEMAX software on the DMD18 active surface and 80-inch projection picture; FIG. 3 is a diagram of optical system R light spot on DMD18 active surface and 80-inch projection picture based on ZEMAX software; FIG. 4 is a diagram of optical system B light spot on DMD18 active surface and 80-inch projection picture based on ZEMAX software; FIG. 5 is a diagram of the spot of the BP light of an optical system on a G luminous surface based on ZEMAX software.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides a miniature projection lighting system of single right angle prism LED which characterized in that: the BP light source reaches a fluorescent powder emission surface of the G light source through the first lens group, the first dichroic mirror and the second lens group, is excited by fluorescent powder, and reaches the light uniformizing mechanism together with the G light source through the second lens group, the first dichroic mirror, the third collimating lens and the second dichroic mirror; the light source B reaches the light homogenizing mechanism through the third lens group, the first dichroic mirror, the third collimating lens and the second dichroic mirror; the R light source reaches the light uniformizing mechanism through the fourth lens group and the second dichroic mirror; the first lens group, the second lens group, the third lens group and the fourth lens group respectively comprise a first collimating lens and a second collimating lens which are sequentially arranged along the incident direction of the light source, and the light source output by the dodging mechanism sequentially reaches the DMD through the relay lens group and the single right-angle prism.
2. The single right angle prism LED micro projection illumination system of claim 1, wherein: the relay lens group includes a first relay lens and a second relay lens.
3. The single right angle prism LED micro projection illumination system of claim 1, wherein: the optical axis of the G light source is a main optical axis, and the included angles between the optical axes of the BP light source, the B light source and the R light source and the main optical axis are acute angles.
4. The single right angle prism LED micro projection illumination system of claim 2, wherein: the first dichroic mirror, the third collimating lens, the second dichroic mirror, the light homogenizing mechanism, the first relay lens, the second relay lens and the single right-angle prism are sequentially arranged on the main optical axis.
5. The single right-angle prism LED micro-projection illumination system of claim 4, wherein: the first dichroic mirror is a blue-reflecting red-green dichroic mirror.
6. The single right-angle prism LED micro-projection illumination system of claim 4, wherein: the second dichroic mirror is a red-reflecting blue-green dichroic mirror.
7. The single right angle prism LED micro projection illumination system of claim 1, wherein: the light uniformizing mechanism is a fly-eye lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010899923.0A CN111812934A (en) | 2020-08-31 | 2020-08-31 | Single right-angle prism LED micro projection lighting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010899923.0A CN111812934A (en) | 2020-08-31 | 2020-08-31 | Single right-angle prism LED micro projection lighting system |
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| CN111812934A true CN111812934A (en) | 2020-10-23 |
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| CN202010899923.0A Pending CN111812934A (en) | 2020-08-31 | 2020-08-31 | Single right-angle prism LED micro projection lighting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113608402A (en) * | 2021-08-11 | 2021-11-05 | 四川长虹电器股份有限公司 | Lighting device and micro projector |
| CN114518686A (en) * | 2020-11-20 | 2022-05-20 | 扬明光学股份有限公司 | Projection system |
| CN115453811A (en) * | 2022-11-10 | 2022-12-09 | 深圳市橙子数字科技有限公司 | Projection lighting device with high stability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114518686A (en) * | 2020-11-20 | 2022-05-20 | 扬明光学股份有限公司 | Projection system |
| CN113608402A (en) * | 2021-08-11 | 2021-11-05 | 四川长虹电器股份有限公司 | Lighting device and micro projector |
| CN115453811A (en) * | 2022-11-10 | 2022-12-09 | 深圳市橙子数字科技有限公司 | Projection lighting device with high stability |
| CN115453811B (en) * | 2022-11-10 | 2023-01-13 | 深圳市橙子数字科技有限公司 | Projection lighting device with high stability |
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Application publication date: 20201023 |
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| RJ01 | Rejection of invention patent application after publication |