CN110543072B - Laser light source and laser projector - Google Patents
Laser light source and laser projector Download PDFInfo
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- CN110543072B CN110543072B CN201810528211.0A CN201810528211A CN110543072B CN 110543072 B CN110543072 B CN 110543072B CN 201810528211 A CN201810528211 A CN 201810528211A CN 110543072 B CN110543072 B CN 110543072B
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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
- G03B21/2073—Polarisers in the lamp house
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- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a laser light source and a laser projector, and belongs to the field of laser projection display. The laser light source comprises a blue laser, a fluorescent wheel and a light combination part, wherein the fluorescent wheel is provided with a blue light polarization reflection area and a fluorescent area; the light combination part is used for transmitting the blue laser emitted by the blue laser to the fluorescent wheel; the light combining component is further configured to transmit a first blue light component reflected by the fluorescent wheel to the light collecting component, where the first blue light component is a light component obtained by the blue light polarization reflecting region changing a polarization state of the blue laser after the blue laser irradiates the blue light polarization reflecting region; the light combining component is further used for transmitting first fluorescent light emitted by the fluorescent wheel to the light collecting component, and the first fluorescent light is generated by irradiating the fluorescent area with the blue laser. The invention solves the problems of complicated optical path system and large volume of the laser light source in the prior art.
Description
Technical Field
The invention relates to the field of laser projection display, in particular to a laser light source and a laser projector.
Background
The laser light source is a light source that emits monochromatic coherent light beams with high brightness and high directivity, and has been gradually applied to the field of projection display in recent years due to many advantages of the laser light source. In a conventional laser light source, a blue laser emitted by a blue laser is generally adopted to excite a fluorescent wheel provided with fluorescent powder to emit broad-spectrum fluorescent light of at least one color, and the blue laser and the fluorescent light are subjected to light homogenizing treatment by a light bar to realize the illumination function of the laser light source.
A laser light source is provided in the related art, and as shown in fig. 1, the laser light source includes a blue laser 101, a dichroic mirror 102, a beam shaping device 103, a fluorescent wheel 104, a color filter wheel 105, and a light bar 106. The light-emitting principle of the laser light source comprises the following steps: after the blue laser light emitted from the blue laser 101 passes through the dichroic mirror 102, the blue laser light is beam-shaped by the beam shaping device 103; the fluorescent wheel 104 rotates in sequence, when the blue laser irradiates the blue light transmission region on the fluorescent wheel 104, the blue laser transmits from the fluorescent wheel 104, passes through the relay circuit optical path of the blue light (which refers to the optical path circuit in fig. 1 in which the blue light is transmitted from the fluorescent wheel 104 to the dichroic mirror 102), then transmits through the dichroic mirror 102 again, passes through the color filter wheel 105, and enters the light rod 106; when blue laser irradiates a fluorescent region on the fluorescent wheel 104, the fluorescent powder on the fluorescent region is excited to emit broad spectrum fluorescent light (such as yellow light and/or green light in fig. 1) of at least one color, the excited fluorescent light is transmitted in a reverse direction, and the fluorescent light is reflected to the color filter wheel 105 by the dichroic mirror 102 after passing through the light beam shaping device 103, and then enters the light bar 106, wherein the color filter wheel 105 is used for filtering the fluorescent light into red light and green light; after light of three colors (three color light for short) passes through the light stick, the display chip controls the three color light to be transmitted to the projection lens, and finally image output of the three color light is realized.
However, in the related art, the optical path of the relay loop of the blue light is complicated, which results in a complicated optical path system of the laser light source and a large volume of the laser light source.
Disclosure of Invention
The embodiment of the invention provides a laser light source and a laser projector, which can solve the problems that the light path system of the laser light source is complex and the volume of the laser light source is large in the related technology. The technical scheme is as follows:
in one aspect, a laser light source is provided, which includes a blue laser, a fluorescent wheel and a light combining component, wherein the fluorescent wheel has a blue light polarization reflection region and a fluorescent region;
the light combination part is used for transmitting the blue laser emitted by the blue laser to the fluorescent wheel;
the light combining component is further configured to transmit a first blue light component reflected by the fluorescent wheel to the light collecting component, where the first blue light component is a light component obtained by the blue light polarization reflecting region changing a polarization state of the blue laser after the blue laser irradiates the blue light polarization reflecting region;
the light combining component is further used for transmitting first fluorescent light emitted by the fluorescent wheel to the light collecting component, and the first fluorescent light is generated by irradiating the fluorescent area with the blue laser.
On the other hand, the laser projector comprises a light valve, a projection lens and any one of the laser light sources;
the light valve is used for modulating the light beam emitted by the laser light source and emitting the modulated light beam to the projection lens so as to realize image output.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the laser light source provided by the embodiment of the invention, the blue light polarization reflection area is arranged on the fluorescence wheel, when the blue laser irradiates on the blue light polarization reflection area, the fluorescence wheel can change the polarization state and the transmission direction of the blue laser, so that the light emitting path of the blue light is consistent with the light emitting paths of the lights with other colors.
Drawings
Fig. 1 is a schematic structural diagram of a laser light source in the related art;
fig. 2 is a schematic structural diagram of a laser light source according to an embodiment of the present invention;
FIG. 3 is a schematic view of a fluorescence wheel provided in accordance with embodiments of the present invention;
FIG. 4 is a schematic view of another fluorescence wheel provided in accordance with embodiments of the present invention;
FIG. 5 is a schematic cross-sectional view of a fluorescent wheel provided in accordance with embodiments of the present invention;
fig. 6 is a schematic structural diagram of another laser light source according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The laser light source is a light source that emits monochromatic coherent light beams with high brightness and high directivity, and has been gradually applied to the field of projection display in recent years due to many advantages of the laser light source.
As an example, the laser light source may be applied to a laser projector. The laser projector may emit light of at least one color to effect display of an image. The primary colors are "basic colors" that cannot be obtained by mixing and blending other colors. Other new colors can be produced by mixing the primary colors in different proportions. Laser projectors typically produce primary color light to effect the display of graphics. The colors generated by a general laser projector are three primary colors, i.e., red, green, and blue, and with the development of technology, the laser projector can also generate two primary colors or five primary colors, which is not limited in the embodiments of the present invention.
There are many laser light sources of the current laser projectors, and the laser light source may include: at least one laser, the laser light source can emit light of at least one color. Typically the laser light source may further comprise: a fluorescent wheel (also called a fluorescent color wheel) may be used as the wavelength conversion device. The laser light source can be a monochromatic laser light source (that is, including a laser and the laser produces a color), can also be double-colored laser light source (that is, including two lasers and every laser produces a color), thus send out the laser of one or two kinds of colors, be provided with phosphor powder on the fluorescence wheel, can be excited out the fluorescence of corresponding color, be used for forming three primary colors with the color of the laser that the laser sent out of laser together, as the projection light source provides the illumination for the ray apparatus part.
Fig. 2 is a schematic structural diagram of a laser light source according to an embodiment of the present invention, as shown in fig. 2, the laser light source includes a blue laser 201, a fluorescent wheel 202, and a light combining component 203, where the fluorescent wheel 202 has a blue polarization reflective region and a fluorescent region.
The light combining part 203 is used for transmitting the blue laser light emitted by the blue laser 201 to the fluorescent wheel 202.
The light combining component 203 is further configured to transmit the first blue light component reflected by the fluorescent wheel 202 to the light collecting component 204, where the first blue light component is a light component obtained by the blue light polarization reflecting region changing the polarization state of the blue laser after the blue laser irradiates the blue light polarization reflecting region.
The light combining component 203 is further configured to transmit the first fluorescent light emitted by the fluorescent wheel 202 to the light collecting component 204, where the first fluorescent light is generated by irradiating the fluorescent region with the blue laser light.
Alternatively, the light collecting component may be a light rod, and the light rod may play a role of light uniformization. The blue laser may be an array of lasers.
Optionally, as shown in fig. 2, a light beam shaping device a may be disposed on one side of the light emitting surface of the blue laser 201, the light beam shaping device may be a telescope system, the telescope system may include a convex lens and a concave lens, and is configured to compress the parallel laser light emitted by the blue laser to reduce the area of the light beam, and the compressed laser light is still parallel laser light, and the transmittance of the parallel laser light obtained after compression in the rear-end optical device is higher than that of the parallel laser light before compression.
Fig. 3 and 4 are schematic diagrams of a fluorescent wheel provided by an embodiment of the present invention, and as shown in fig. 3 or 4, the fluorescent wheel is provided with a blue light polarization reflection region B and a fluorescent region.
Optionally, referring to fig. 3, a mixture of green phosphor and yellow phosphor is disposed on the surface of the fluorescent region Y; alternatively, referring to fig. 4, the phosphor section includes a first sub-phosphor section Y1 and a second sub-phosphor section Y2, a surface of the first sub-phosphor section Y1 is provided with green phosphor, and a surface of the second sub-phosphor section Y2 is provided with yellow phosphor.
It should be noted that, at least yellow phosphor is disposed on the fluorescent region of the fluorescent wheel provided in the embodiment of the present invention, and when blue laser light is irradiated onto the yellow phosphor, the yellow phosphor can be excited to emit yellow light.
Optionally, fig. 5 is a schematic cross-sectional view of a fluorescent wheel according to an embodiment of the present invention, and as shown in fig. 5, the blue light polarization reflection region B may include a quarter-wave plate B1 and a reflection film layer B2 sequentially arranged along a direction away from the light combining component, that is, the blue light polarization reflection region B includes a quarter-wave plate B1 and a reflection film layer B2 sequentially arranged along an incident direction of the blue laser γ. The reflective film layer may be a reflective sheet or a polarizing sheet. It should be noted that when light passes through the quarter-wave plate, the polarization state of the light is deflected by pi/4, and the reflective film layer can reflect the light.
For example, the optical path transmission process of the laser light source shown in fig. 2 may include: after passing through the beam shaping device a, the blue laser emitted by the blue laser 201 is reflected to the fluorescent wheel 202 by the light combining part 203; the fluorescence wheel 202 rotates in time sequence, when the blue laser irradiates the blue light polarization reflection region on the fluorescence wheel 202, the blue laser first passes through the quarter-wave plate, the polarization state is deflected by pi/4, and after passing through the quarter-wave plate for the second time under the reflection action of the reflection film layer, the polarization state is deflected by pi/4 again, so as to obtain a first blue light component (namely, the deflection difference value between the polarization state of the first blue light component and the polarization state of the blue laser is pi/2), and the first blue light component is transmitted to the light collection component 204 by the light combination component 203; when the blue laser light irradiates the fluorescence area on the fluorescence wheel 202, the fluorescence area is excited to emit fluorescence of a broad spectrum, and the fluorescence is transmitted to the light collection member 204 by the light combining member 203. The fluorescence may include green fluorescence and yellow fluorescence, and the fluorescence and the first blue light component may be mixed to form white light after entering the light collection component 204, so as to implement the illumination function of the laser light source. The arrow direction in fig. 2 indicates the transmission path (i.e., optical path) of light.
Optionally, the blue laser is P-polarized light, and the first blue light component is S-polarized light; alternatively, the blue laser light is S-polarized light and the first blue light component is P-polarized light.
In summary, in the laser light source provided in the embodiment of the present invention, the blue light polarization reflection region is disposed on the fluorescence wheel, and when the blue laser irradiates on the blue light polarization reflection region, the fluorescence wheel can change the polarization state and the transmission direction of the blue laser, so that the light emitting path of the blue laser is consistent with the light emitting paths of the lights with other colors.
Further, fig. 6 is a schematic structural diagram of another laser light source according to an embodiment of the present invention, and as shown in fig. 6, the laser light source further includes a fixed fluorescent member 205, the fixed fluorescent member 205 is disposed on a side of the fluorescent wheel 202 away from the light combining part 203, and an orthographic projection of the fixed fluorescent member 205 on the fluorescent wheel 202 at least partially overlaps with the blue light polarization reflection region. The orthographic projection of the optional fixed fluorescent member on the fluorescent wheel covers the blue light polarization reflection area.
The stationary fluorescent member 205 is configured to generate a second fluorescent light upon receiving the second blue light component transmitted by the fluorescent wheel 202.
The light combining part 203 is also used for transmitting the second fluorescent light transmitted from the fluorescent wheel 202 to the light collecting part 204.
The second blue light component is a light component obtained by irradiating the fixed fluorescent member 205 with a second blue light component, and then changing the polarization state of the blue laser by the blue light polarization reflective region, where the polarization state of the second blue light component is different from that of the first blue light component.
It should be noted that, in the transmission process of the blue laser, after the blue laser is converged and received by the light combining component, the polarization angle (i.e., the polarization state) of a part of the blue laser changes, and the commonly adopted reflective film layer can reflect the polarized light with the polarization angle within a preset angle range, where the preset angle range includes the polarization angle of the blue laser, of which the change of the polarization angle is smaller than a preset threshold value in the transmission process, after the blue laser passes through the quarter-wave plate; and after the part of blue laser with the polarization angle larger than the preset threshold value passes through the quarter-wave plate, the polarization angle may not be in the preset angle range, so that the part of blue laser is transmitted from the blue light polarization reflection area to cause the loss of the blue light.
The brightness is determined by a visual function (also called visibility), the central wavelength of the visual function is 555 nm, namely the brightness of light with the wavelength of 555 nm is the maximum, and the closer the wavelength of the light is to the central wavelength, the higher the brightness is; because the wavelength of the blue laser is about 455 nanometers, the brightness of the blue laser is smaller, and the central wavelength of the fluorescence is about 555 nanometers, that is, the brightness of the fluorescence is larger, the second blue light component transmitted by the fluorescence wheel excites the fixed fluorescence piece to emit second fluorescence, and the second fluorescence and the first blue light component are mixed to improve the brightness of the blue light emitted from the laser light source; in addition, because the light with different colors is obtained by mixing the three primary colors of red, green and blue with different proportions, the color coordinate of the light can be changed by changing the mixing proportion of the three primary colors, and the saturation of the blue light can be improved by mixing the blue laser and the fluorescent light, so that the wavelength of the mixed blue light reaches 474 nanometers (which accords with the color coordinate of the standard blue light in NTSC 709), and the color coordinate of the blue light is improved.
Optionally, the fixed fluorescent member may be fixedly connected to the fluorescent wheel, so that the fixed fluorescent member is linked to the fluorescent wheel. Wherein, the fixed fluorescent member can be provided with green fluorescent powder and/or yellow fluorescent powder, and the second fluorescent light can be green fluorescent light and/or yellow fluorescent light.
It should be noted that the second blue light component irradiates on the fixed fluorescent member, and after the fluorescent powder on the fixed fluorescent member is excited to emit the second fluorescent light, the second fluorescent light can be transmitted from the fluorescent wheel, that is, the reflective film layer of the blue light polarization reflective region can transmit the second fluorescent light, so as to realize the light mixing of the second fluorescent light and the first blue light component.
Alternatively, referring to fig. 6, the light combining part 203 includes a polarizer 31, and the polarizer 31 is disposed on the light incident side of the light collecting part 204; the polarizing plate 31 is for reflecting the blue laser light and transmitting the first blue light component, the first fluorescent light, and the second fluorescent light.
Further, referring to fig. 6, the light combining part 203 may further include a focusing lens 32 and a collimating lens 33; the focusing lens 32 is disposed between the polarizer 31 and the light collection member 204, and the collimating lens 33 is disposed between the polarizer 31 and the fluorescent wheel 202. When the beam spread angle of the light transmitted by the polaroid is larger than the light collection angle of the light collection component, the light collection efficiency is low, and the brightness of the laser light source is influenced, so that the focusing lens can be used for carrying out focusing treatment on the first blue light component, the first fluorescent light and the second fluorescent light transmitted by the polaroid, the number of light rays entering the light collection component is increased, and the light output rate of the laser light source is improved; the collimating lens may be used to perform focusing processing on the blue laser light transmitted from the light combining component 203 to the fluorescent wheel 202, and may also be used to perform collimating processing on the light beam transmitted from the fluorescent wheel 202 to the light combining component 203, so as to improve uniformity of the emitted light. In the embodiment of the present invention, each of the focusing lens and the collimating lens may be composed of at least one lens, which is not limited herein.
Optionally, referring to fig. 6, the laser light source may further include a color filter wheel 206, the color filter wheel 206 is disposed between the light combining part 203 and the light incident side of the light collecting part 204, and the color filter wheel 206 includes a red filter region, a blue filter region, and a green filter region. When the color filter wheel rotates, red light, blue light and green light can be transmitted to the light collection component in a time sequence, the red light and the green light are obtained by filtering first fluorescence by the color filter wheel, the blue light is obtained by filtering a first blue light component by the color filter wheel, or the blue light is obtained by filtering the first blue light component and second fluorescence by the color filter wheel.
It should be noted that the fluorescent wheel and the fixed fluorescent member provided by the embodiment of the present invention can also be applied to other types of laser light sources, and the above laser light sources are only used for exemplary illustration.
In summary, in the laser light source provided in the embodiment of the present invention, the blue light polarization reflection area is disposed on the fluorescence wheel, and when the blue laser irradiates on the blue light polarization reflection area, the fluorescence wheel can change the polarization state and the transmission direction of the blue laser, so that the light emitting path of the blue laser is consistent with the light emitting paths of the lights with other colors; in addition, through the arrangement of the fixed fluorescent part, after the second blue light component irradiates the fixed fluorescent part, the fixed fluorescent part is excited to emit second fluorescent light, so that the second fluorescent light and the first blue light component are mixed, and the brightness and the color coordinate of the blue light are improved.
An embodiment of the present invention provides a laser projector, which may include a light valve, a projection lens, and a laser light source as shown in fig. 2 or fig. 6;
the light valve is used for modulating the light beam emitted by the laser light source and emitting the modulated light beam to the projection lens so as to realize image output.
The invention is not to be considered as limited to the particular embodiments shown and described, but is to be understood that various modifications, equivalents, improvements and the like can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The laser light source is characterized by comprising a blue laser, a fluorescent wheel, a light combining component and a fixed fluorescent piece, wherein the fluorescent wheel is provided with a blue light polarization reflection area and a fluorescent area, and the fixed fluorescent piece is arranged on one side of the fluorescent wheel, which is far away from the light combining component;
the light combination part is used for transmitting the blue laser emitted by the blue laser to the fluorescent wheel;
the light combining component is further configured to transmit a first blue light component reflected by the fluorescent wheel to the light collecting component, where the first blue light component is a light component obtained by the blue light polarization reflecting region changing a polarization state of the blue laser after the blue laser irradiates the blue light polarization reflecting region;
the light combining component is also used for transmitting first fluorescent light emitted by the fluorescent wheel to the light collecting component, and the first fluorescent light is generated by irradiating the fluorescent area with the blue laser;
the fixed fluorescent part is used for generating second fluorescent light after receiving the second blue light component transmitted by the fluorescent wheel;
the light combining part is also used for transmitting the second fluorescence transmitted from the fluorescence wheel to the light collecting part;
wherein the second fluorescence is generated by irradiating the fixed fluorescent member with a second blue light component, the second blue light component is a light component obtained by changing a polarization state of the blue laser by the blue light polarization reflection region after the blue laser is irradiated to the blue light polarization reflection region, and the polarization state of the second blue light component is different from that of the first blue light component;
after the second fluorescent light is transmitted from the fluorescent wheel, the second fluorescent light is mixed with the first blue light component.
2. The laser light source according to claim 1,
the fixed fluorescent part is fixedly connected with the fluorescent wheel, and the orthographic projection of the fixed fluorescent part on the fluorescent wheel is at least partially overlapped with the blue light polarization reflection area.
3. The laser light source according to claim 1, wherein the light combining member comprises a polarizing plate disposed on a light incident side of the light collecting member;
the polarizing plate is configured to reflect the blue laser light and transmit the first blue light component, the first fluorescent light, and the second fluorescent light.
4. The laser light source of claim 1, wherein the blue light polarization reflection region comprises a quarter-wave plate and a reflection film layer sequentially arranged along a direction away from the light combining component.
5. The laser light source according to claim 4,
the reflecting film layer is a reflecting sheet or a polaroid.
6. The laser light source according to any one of claims 1 to 3,
the fluorescent area comprises a first sub-fluorescent area and a second sub-fluorescent area, green fluorescent powder is arranged on the surface of the first sub-fluorescent area, and yellow fluorescent powder is arranged on the surface of the second sub-fluorescent area.
7. The laser light source according to any one of claims 1 to 3,
and a mixture of green fluorescent powder and yellow fluorescent powder is arranged on the surface of the fluorescent area.
8. The laser light source of any one of claims 1 to 3, further comprising a color filter wheel disposed between the light combining member and the light incident side of the light collecting member, the color filter wheel having a red filter region, a blue filter region, and a green filter region;
when the color filter wheel rotates, red light, blue light and green light can be transmitted to the light collection component in a time sequence, the red light and the green light are obtained by filtering the first fluorescence by the color filter wheel, and the blue light is obtained by filtering the first blue light component by the color filter wheel.
9. The laser light source of claim 3, wherein the light combining component further comprises a focusing lens and a collimating lens;
the focusing lens is disposed between the polarizer and the light collection member, and the collimating lens is disposed between the polarizer and the phosphor wheel.
10. A laser projector comprising a light valve, a projection lens and a laser light source according to any one of claims 1 to 9;
the light valve is used for modulating the light beam emitted by the laser light source and emitting the modulated light beam to the projection lens so as to realize image output.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113109986B (en) * | 2020-01-10 | 2022-08-16 | 明基智能科技（上海）有限公司 | Projection device |
| CN111221211A (en) * | 2020-03-19 | 2020-06-02 | 青岛海信激光显示股份有限公司 | Light source device and laser projection apparatus |
| CN111176065A (en) * | 2020-03-19 | 2020-05-19 | 青岛海信激光显示股份有限公司 | Light source device and laser projection apparatus |
| CN113900333B (en) * | 2020-06-22 | 2023-02-24 | 青岛海信激光显示股份有限公司 | Light source assembly and projection equipment |
| CN113900339B (en) | 2020-06-22 | 2022-09-27 | 青岛海信激光显示股份有限公司 | Light source assembly and projection equipment |
| CN113311654B (en) * | 2021-06-18 | 2022-11-18 | 青岛海信激光显示股份有限公司 | Projection light source and projection apparatus |
| CN115702384A (en) * | 2020-06-22 | 2023-02-14 | 青岛海信激光显示股份有限公司 | Light source assembly and projection equipment |
| CN113900332B (en) * | 2020-06-22 | 2023-02-24 | 青岛海信激光显示股份有限公司 | Light source assembly and projection equipment |
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| CN107300825A (en) * | 2017-07-14 | 2017-10-27 | 苏州佳世达光电有限公司 | Laser projection |
| CN107505807A (en) * | 2017-10-10 | 2017-12-22 | 青岛海信电器股份有限公司 | A kind of LASER Light Source and projection display apparatus |
| CN107656413A (en) * | 2017-10-27 | 2018-02-02 | 苏州佳世达光电有限公司 | A kind of projection arrangement |
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