CN110967902B - Diffusion reflection sheet, light guide pipe, laser light source device and projector - Google Patents
Diffusion reflection sheet, light guide pipe, laser light source device and projector Download PDFInfo
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- CN110967902B CN110967902B CN201811160148.6A CN201811160148A CN110967902B CN 110967902 B CN110967902 B CN 110967902B CN 201811160148 A CN201811160148 A CN 201811160148A CN 110967902 B CN110967902 B CN 110967902B
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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
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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
- G03B21/2066—Reflectors in illumination beam
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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
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- Lasers (AREA)
Abstract
The embodiment of the invention relates to a diffuse reflection sheet, a light guide pipe, a laser light source device and a laser projector, wherein the diffuse reflection sheet comprises a selective reflection layer, a transmission layer, a diffusion layer and a reflection layer which are sequentially arranged; the selective reflecting layer can reflect the stimulated laser and transmit exciting light emitted by the laser; the transmissive layer being capable of transmitting light incident to the layer; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light. The diffusion reflection sheet can be used for manufacturing a light guide pipe for light uniformization, can ensure the light uniformization performance of exciting light, can ensure that laser light is not scattered, and the brightness of the laser light is not lost.
Description
Technical Field
The invention belongs to the technical field of laser display, and particularly relates to a diffusion reflection sheet, a light guide pipe, a laser light source device and a projector.
Background
The laser has good monochromaticity, and a wider color gamut range can be obtained by using the laser as a display light source, so that the laser has richer color expression, higher color saturation, high brightness, long service life and low energy consumption.
The laser light sources of the laser device can be generally divided into three types, one type is a red, green and blue tricolor laser as a light source, the other type is a laser fluorescent light source, red light, green light and directly transmitted blue light generated by exciting fluorescent powder by blue laser are generally used as light sources, and the laser device also comprises a mixed light source which adopts an LED light source and the laser fluorescent light source to be mixed for generating the tricolor light source. Since laser light is coherent light, if the laser light is used directly for display without any processing, a speckle pattern, i.e., speckle, generated by laser interference, having uneven brightness distribution is displayed on a screen. The field of laser devices generally utilizes diffusers, light pipes for light homogenization and speckle reduction.
The reflector is an optical element commonly used in the field of laser equipment, and generally has only a reflection function and does not have a speckle eliminating function. In the prior art, a diffusion sheet is arranged in a laser light source device as an independent optical device, the diffusion sheet scatters all light passing through the diffusion sheet without selectivity, the diffusion sheet only has a scattering function, a reflector only has a reflecting function, and the diffusion sheet and the reflector both have the problem of single function.
In addition, one of the light conduits used for light uniformization of the laser device in the prior art is formed by enclosing and splicing a reflector, and the light conduits generally implement integration of spatial and angular distributions of light beams by reflecting light incident to the light conduits for multiple times at a certain incident angle, so as to achieve the purpose of light uniformization.
Disclosure of Invention
In order to solve the technical problem that the diffusion sheet and the reflector have single functions, the embodiment of the invention provides a diffusion reflection sheet; in order to solve the problem that the light guide pipe has poor light homogenizing effect on coherent light such as laser light, the embodiment of the invention provides the light guide pipe; a laser light source device and a laser projector are also provided.
The embodiment of the invention provides a first diffuse reflection sheet, which comprises a selective reflection layer, a transmission layer, a diffusion layer and a reflection layer which are sequentially arranged; the selective reflecting layer can reflect the stimulated laser and transmit exciting light emitted by the laser; the transmissive layer being capable of transmitting light incident to the layer; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
The embodiment of the invention also provides a second diffuse reflection sheet, which comprises a selective reflection layer, a diffusion layer and a reflection layer, wherein the diffusion layer is arranged between the selective reflection layer and the reflection layer; the selective reflecting layer can reflect the stimulated laser and transmit exciting light emitted by the laser; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
The embodiment of the invention also provides a third diffuse reflection sheet, which comprises a diffusion layer, a transmission layer and a reflection layer; the transmissive layer is positioned between the diffusive layer and the reflective layer; the diffusion layer can scatter exciting light emitted by the laser; the transmissive layer being capable of transmitting light incident to the layer; the reflective layer is capable of reflecting light impinging on the layer.
The embodiment of the invention also provides a fourth diffusion reflection sheet, which comprises a diffusion layer and a reflection layer, wherein the reflection layer is arranged on the diffusion layer, and the diffusion layer can scatter exciting light emitted by a laser; the reflective layer is capable of reflecting light impinging on the layer.
The embodiment of the invention provides a first light guide pipe, which comprises a pipe body with a hollow structure, wherein all or part of the pipe body is provided with a selective reflecting layer, a transmission layer, a diffusion layer and a reflecting layer from inside to outside in the radial direction of the pipe body, and the selective reflecting layer can reflect received laser and transmit exciting light emitted by a laser; the transmissive layer being capable of transmitting light incident to the layer; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
Further, the tube body is formed by encircling and splicing the first type of diffusion reflection sheet, or the tube body is partially formed by the first type of diffusion reflection sheet.
The embodiment of the present invention further provides a second light guide, including a hollow tube body, all or part of the tube body having a selective reflection layer, a diffusion layer, and a reflection layer from inside to outside in a radial direction of the tube body; the selective reflecting layer can reflect the stimulated laser and transmit exciting light emitted by the laser; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
Further, the tube body is formed by encircling and splicing the second type diffusion reflection sheet, or the tube body is partially formed by the second type diffusion reflection sheet.
The embodiment of the invention also provides a laser light source device, which comprises the third diffusion reflection sheet or the fourth diffusion reflection sheet, wherein the diffusion reflection sheet is used for homogenizing light and converting an optical axis; alternatively, the laser light source device comprises a light guide as described above.
The embodiment of the invention also provides a laser projector, which comprises the third diffusion reflection sheet or the fourth diffusion reflection sheet, wherein the diffusion reflection sheet is used for homogenizing light and converting an optical axis; alternatively, the laser projector comprises the light guide tube as described above, wherein the light guide tube is used for homogenizing light; or the laser projector comprises the laser light source device.
The embodiment of the invention has the following beneficial effects: the diffuse reflection sheet provided by the embodiment of the invention has scattering and reflecting functions, the first diffuse reflection sheet and the second diffuse reflection sheet can be used for manufacturing a light guide pipe, the light guide pipe can be used for light uniformization and speckle elimination, laser is not scattered due to the function of the selective reflection layer, the brightness of the laser is not influenced, and the third diffuse reflection sheet and the fourth diffuse reflection sheet can be used for a laser light source device or a laser projector and can be used for light uniformization and optical axis conversion. The diffuse reflection sheet provided by the embodiment of the invention has the advantages of simple structure and convenience in manufacturing, is applied to a laser light source device and laser display equipment, and can be used for homogenizing light and eliminating the speckle problem.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a diffusive reflector in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of a diffusive reflective plate according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a laser light source system according to an embodiment of the present invention;
FIG. 4a is a front view of a light pipe of an embodiment of the present invention;
FIG. 4b is a cross-sectional view of one embodiment of a light pipe of the present invention;
FIG. 4c is a schematic view of another embodiment of a light pipe of the present invention;
FIG. 5a is a schematic view of a prior art dodging light pipe;
FIG. 5b is a schematic view of a light pipe dodging 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, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the drawings and the following examples.
Example 1 diffusive reflective plate
Referring to fig. 1, an embodiment of the present invention provides a diffusive reflective plate G1 that can be used in a laser light source device, including a diffusive layer 101, a transmissive layer 102, and a reflective layer 103; the transmissive layer 102 is located between the diffusive layer 101 and the reflective layer 103. The diffusion layer 101 can scatter excitation light emitted by a laser; the transmissive layer 102 is not selective and can transmit light incident to the layer; the reflective layer 103 is not selective and can reflect light irradiated to the layer.
The excitation light is light emitted from a laser, and in the field of laser display, for example, a laser projector, the excitation light may be blue laser light emitted from a blue laser.
The excited light is light generated by exciting the wavelength conversion material with the exciting light, and can be red excited light, blue excited light, green excited light, yellow excited light and the like in the field of laser display, such as laser projectors.
In the field of laser display, such as laser projectors, both the excitation light emitted by a laser and the received laser can be input into an optical-mechanical system of the laser projector for image display.
The wavelength conversion material can generate stimulated light under the excitation of exciting light, and the wavelength conversion material can be fluorescent material, such as red fluorescent material, green fluorescent material, yellow fluorescent material and blue fluorescent material. The excitation light emitted by the laser excites different fluorescent materials to generate excited light, such as red light, green light, yellow light, blue light and the like. Specific examples of the material include silicate phosphor, nitride phosphor, aluminate phosphor, oxide phosphor, oxynitride phosphor, chloride phosphor, acid chloride phosphor, sulfide phosphor, oxysulfide phosphor, halide phosphor, chalcogenide phosphor, halophosphate phosphor, and garnet-based compound phosphor, and the wavelength conversion material of the present invention is not limited to the above.
In the present embodiment, the diffusion layer 101 may be obtained by coating a scattering material or plating a suitable film layer on the surface of a substrate (e.g., glass or the like) that can transmit excitation light, or by structuring a microstructure on the surface of a substrate (e.g., glass or the like) that can transmit excitation light by laser etching, chemical etching, or other physical methods, for example, whereby a reflective layer may be formed on the outer surface side of the transmissive layer. The reflective layer 103 is also obtained by conventional means and is not described in detail.
For example, as shown in fig. 1, when the diffuse reflection sheet G1 of the present embodiment is used as an element of a laser device, excitation light L1 emitted from a laser is scattered by the diffusion layer 201, and the emitted light passes through the transmission layer 202, is reflected by the reflection layer 203, and then is emitted from the diffusion layer 201.
After light emitted by the laser is scattered by the diffusion layer, the shimming and decoherence functions can be realized. The diffusion reflector plate in the embodiment has the functions of scattering and reflecting, the scattering function is added compared with a reflector in the prior art, the reflector in the prior art is replaced, and the diffusion reflector plate is used for a laser light source device and can improve the speckle problem.
Example 2 diffusive reflective plate
The embodiment of the invention also provides another diffusion reflection sheet which can be used for a laser light source device and comprises a diffusion layer and a reflection layer, wherein the reflection layer is arranged on the diffusion layer. The diffusion layer can scatter exciting light emitted by the laser; the reflective layer is not selective and is capable of reflecting light impinging on the layer.
The excitation light is light emitted from a laser, and in the field of laser display, for example, a laser projector, the excitation light may be blue laser light emitted from a blue laser.
The excited light is light generated by exciting the wavelength conversion material with the exciting light, and can be red excited light, blue excited light, green excited light, yellow excited light and the like in the field of laser display, such as laser projectors.
In the field of laser display, such as laser projectors, both the excitation light emitted by a laser and the received laser can be input into an optical-mechanical system of the laser projector for image display.
In this embodiment, the wavelength conversion material is the same as that in embodiment 1, and is not described again.
In the present embodiment, the diffusion layer may be obtained by, for example, dispersing a material having a scattering property, bubbles, or a material having a refractive index different from that of the matrix into the matrix, whereby the reflective layer may be formed on the diffusion layer. The substrate may be, for example, glass or the like. The reflective layer is also obtained by conventional means and is not described in detail.
For example, when the diffuse reflection sheet of this embodiment is used as an element of a laser display device, excitation light emitted by a laser is scattered by the diffusion layer, and emergent light is reflected by the reflection layer and then emitted from the diffusion layer.
After light emitted by the laser is scattered by the diffusion layer, the shimming decoherence effect can be realized. The diffusion reflector plate in the embodiment has the functions of scattering and reflecting, the scattering function is added compared with a reflector in the prior art, the reflector in the prior art is replaced, and the diffusion reflector plate is used for a laser light source device and can improve the speckle problem.
Example 3 diffusive reflective plate
Referring to fig. 2, an embodiment of the present invention provides a diffuse reflection sheet G2, which can be used in a laser light source device, and includes a selective reflection layer 201, a transmission layer 202, a diffusion layer 203, and a reflection layer 204, which are sequentially disposed; the diffusion layer 203 is located on the reflection layer 204, the transmission layer 202 is located on the diffusion layer 203, and the selective reflection layer 201 is used on the transmission layer 202. The selective reflection layer 201 can reflect the stimulated light and transmit the stimulated light; the transmissive layer 202 is not selective and can transmit light incident to the layer; the diffusion layer 203 can scatter excitation light emitted from the laser, and the reflection layer 204 is not selective and can reflect light irradiated to the layer.
The excitation light is light emitted from a laser, and in the field of laser display, for example, a laser projector, the excitation light may be blue laser light emitted from a blue laser.
The excited light is light generated by exciting the wavelength conversion material with the exciting light, and can be red excited light, blue excited light, green excited light, yellow excited light and the like in the field of laser display, such as laser projectors.
In the field of laser display, such as laser projectors, both the excitation light emitted by a laser and the received laser can be input into an optical-mechanical system of the laser projector for image display.
In this embodiment, the wavelength conversion material is the same as that in embodiment 1, and is not described again.
In the present embodiment, the diffusion layer 203 can be obtained by, for example, coating a scattering material on the surface of a substrate (e.g., glass or the like) that can transmit excitation light or plating a suitable film layer thereon, or by structuring a microstructure on the surface of a substrate (e.g., glass or the like) that can transmit excitation light by laser etching, chemical etching, or other physical methods, whereby selective reflection can be formed only on the outer surface side of the transmission layer, and a reflection layer is formed on the outer surface side of the diffusion layer. The selective reflection layer 201 and the reflection layer 204 are also obtained by conventional means, and are not described in detail.
For example, as shown in fig. 2, the diffuse reflection sheet G2 of the present embodiment can be used to manufacture a light guide tube required by a laser display device, when in operation, an excitation light L2 emitted by a laser transmits through the selective reflection layer 201, and then enters the diffusion layer 203 through the transmission layer 202, after being scattered by the diffusion layer 203, the excitation light is reflected by the reflection layer 204, and the reflected light is emitted through the diffusion layer 203, the transmission layer 202, and the selective reflection layer 201; the received laser light is directly reflected by the selective reflection layer 201, is not incident on the diffusion layer 203, and is not scattered.
After light emitted by the laser is scattered by the diffusion layer, the shimming and decoherence functions can be realized. The diffuse reflection piece in this embodiment has scattering and reflection function concurrently, compares the speculum among the prior art and has increased the scattering function, can be used to make the light pipe for among the laser source device, the exciting light is by the selective scattering, can improve the speckle problem, receives the laser then not scattered, avoids the decay of luminance.
Example 4 diffusive reflective plate
The embodiment of the invention also provides another diffusion reflection sheet which can be used for a laser light source device and comprises a selective reflection layer, a diffusion layer and a reflection layer, wherein the diffusion layer is arranged between the selective reflection layer and the reflection layer. The selective reflection layer can reflect stimulated laser and transmit exciting light; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer is not selective and is capable of reflecting light impinging on the layer.
The excitation light is light emitted from a laser, and in the field of laser display, for example, a laser projector, the excitation light may be blue laser light emitted from a blue laser.
The excited light is light generated by exciting the wavelength conversion material with the exciting light, and can be red excited light, blue excited light, green excited light, yellow excited light and the like in the field of laser display, such as laser projectors.
In the field of laser display, such as laser projectors, both the excitation light emitted by a laser and the received laser can be input into an optical-mechanical system of the laser projector for image display.
In this embodiment, the wavelength conversion material is the same as that in embodiment 1, and is not described again.
In this embodiment, the diffusion layer may be obtained by, for example, dispersing a material having a scattering property, bubbles, or a material having a refractive index different from that of the matrix into the matrix, and thus, the selective reflection layer and the reflection layer may be formed on both sides of the diffusion layer, respectively. The substrate may be, for example, glass or the like. The selective reflection layer and the reflection layer are also obtained by conventional means, and are not described in detail.
Illustratively, when the diffusion reflection sheet of the embodiment works as an element of a laser display device, excitation light emitted by a laser transmits through the selective reflection layer and is scattered by the diffusion layer, and emergent light is reflected by the reflection layer and then is emitted through the diffusion layer and the selective reflection layer; the received laser light is directly reflected by the selective reflection layer 201, is not incident to the diffusion layer, and is not scattered.
After light emitted by the laser is scattered by the diffusion layer, the shimming and decoherence functions can be realized. The diffuse reflection piece in this embodiment has scattering and reflection function concurrently, compares the speculum among the prior art and has increased the scattering function, can be used to make the light pipe for among the laser source device, the exciting light is by the selective scattering, can improve the speckle problem, receives the laser then not scattered, avoids the decay of luminance.
EXAMPLE 5 laser light Source device
Hereinafter, another specific embodiment of the laser light source device is exemplarily provided, and it can be understood by those skilled in the art that, based on the disclosure of the embodiments 1-2, in the field of laser display devices, the above-mentioned diffusion reflection sheet is used for dodging and changing the optical axis, and the arrangement manner of the diffusion reflection sheet in the laser light source device can be flexibly set by those skilled in the art according to the specific characteristics and system requirements, so that the laser light source device of the present invention is not limited by the following specific embodiment.
Referring to fig. 3, the present embodiment further provides a laser light source apparatus, which includes a laser 100, a first collimating system 200, a diffusion sheet 300, a dichroic mirror 400, a converging system 500, a wavelength conversion system 600, a second collimating system 700, and a light recycling system 800.
The laser 100 is, for example, a blue laser that emits blue light as excitation light;
the first collimating system 200 is a lens or a lens group, and is configured to collimate excitation light emitted by the laser 100;
the diffusion sheet 300 is used for homogenizing the collimated excitation light emitted by the first collimating system;
the dichroic mirror 400 is used for transmitting the excitation light and reflecting the received laser light;
the converging system 500 is a lens or a lens group, and is configured to converge the excitation light emitted from the dichroic mirror and collect the received laser light reflected by the wavelength conversion device 600;
the wavelength conversion system 600, for example, includes an annular substrate, a transmission portion (or a notch) and a reflection portion are disposed in a circumferential direction of the substrate, excitation light can pass through the transmission portion (or the notch), and a wavelength conversion material is disposed on the reflection portion for generating stimulated light under excitation of the excitation light emitted by a laser; in the field of laser display, such as a laser projector, the wavelength conversion system is driven by a motor to rotate, excitation light emitted by a laser irradiates a wavelength conversion material to generate excited light, the excited light is input into an optical-mechanical system for displaying an image, when the laser is rotated to a position where a transmission part (or a gap) is positioned on an emission path of the excitation light, the excitation light penetrates through the transmission part, and the excitation light can be input into the optical-mechanical system for displaying the image; the converged excitation light emitted from the converging system 500 passes through the notch or the transmission part;
the second collimating system 700 is a lens or a lens group, and is used for collimating the excitation light transmitted through the transmission part (or the notch) of the wavelength conversion system 600;
the light recycling system 800 includes one or more diffuse reflection sheets of the above embodiments 1 or 2, and is configured to recycle collimated light emitted from the second collimating system 700. Preferably, the light recovery system may use three diffusion reflection sheets of the above embodiment 1 or 2, or may use a combination of a diffusion reflection sheet of the above embodiment 1 or 2 and a reflection mirror, for example, 2 diffusion reflection sheets and 1 reflection mirror in the above embodiment 1 or 2, in which the excitation light emitted from the second collimation system 700 is reflected three times, the optical axis is rotated 270 °, and then, the excitation light enters the dichroic mirror 400 in a direction perpendicular to the optical axis of the first collimation system, and is emitted after passing through the dichroic mirror 400.
Exciting light emitted by the laser 100 enters the first collimating system 200, and after collimated light emitted by the first collimating system 200 is homogenized by the diffusion sheet, the exciting light emitted by the diffusion sheet transmits the dichroic mirror 400; the excitation light emitted from the dichroic mirror 400 is converged by the converging system 300 and then irradiated onto the wavelength conversion material on the wavelength conversion system 600, and the excitation wavelength conversion material generates the stimulated light, which is reflected by the reflecting portion of the wavelength conversion system 600, and then reflected by the dichroic mirror 400, enters the light path, and combines with the excitation light recovered by the light recovery system 800.
In this embodiment, the wavelength conversion material is the same as that in embodiment 1, and is not described again.
It will be understood by those skilled in the art that the diffusive reflective plate described in the above embodiment 1 or 2 is not limited to use in a light recovery system, and in a laser display device, a diffusive reflective plate may be used instead of a reflective mirror, particularly a reflective mirror for reflecting excitation light.
The laser light source device adopts the diffusion reflector plate to replace a reflector to carry out light uniformization and speckle elimination effects, and further improves the light uniformization and speckle elimination effects on the premise of not increasing optical elements.
The above embodiments have described specific compositions and structures of the laser light source device, so as to fully disclose the present invention by way of example, and to facilitate understanding and implementation by those skilled in the art, and it can be understood by those skilled in the art that in the field of optical technology, different combinations of optical devices may be used to achieve the same purpose, and the laser light source device of the present invention is not limited to the specific structures in the specification.
EXAMPLE 6 light pipe
Referring to fig. 4a, 4b and 4c, an embodiment of the present invention further provides a light guide, which may be used in a laser display device, such as a laser projector, the light guide having an incident end and an exit end of light, and including a hollow tube body having an inner surface and an outer surface, and forming a transmission channel of light within a range defined by the outer surface of the tube body; the whole or part of the tube body is provided with a selective reflecting layer, a transmission layer, a diffusion layer and a reflecting layer from inside to outside in the radial direction of the tube body, and the selective reflecting layer can reflect the excited light and transmit the excited light; the transmissive layer is not selective and is capable of transmitting light incident to the layer; the diffusion layer can scatter the excitation light emitted by the laser, and the reflection layer is not selective and can reflect the light irradiated to the layer. The light is incident from the incident end at a certain incident angle, and is emitted from the emergent end after being reflected and/or scattered for multiple times in the transmission channel of the light, so that the speckle problem caused by the exciting light emitted by the laser can be eliminated.
The excitation light is light emitted from a laser, and in the field of laser display, for example, a laser projector, the excitation light may be blue laser light emitted from a blue laser. The excited light is light generated by exciting the wavelength conversion material with the exciting light, and can be red excited light, blue excited light, green excited light, yellow excited light and the like in the field of laser display, such as laser projectors. In this embodiment, the wavelength conversion material is the same as that in embodiment 3, and is not described again. In the field of laser display, such as laser projectors, both the excitation light emitted by a laser and the received laser can be input into an optical-mechanical system of the laser projector for image display.
In one embodiment, the tubes are all formed by surrounding and splicing the diffuse reflection sheet G1 of example 3 (as shown in fig. 4a and 4 b), that is, the tubes are all formed by the diffuse reflection sheet G1, for example, by gluing or other means, and the formation method is not particularly limited.
In another embodiment, the tube is partially formed by the diffuse reflection sheet G1 of example 3, i.e., one part of the tube is the diffuse reflection sheet G1, and the other part is, for example, a mirror, and the tube is formed by jointly splicing the diffuse reflection sheet G1 and the mirror. For example, in one embodiment, referring to fig. 4c, the first section of the light guide in the length direction is formed by splicing the diffuse reflection sheets G1 together, and the second section of the light guide in the length direction is formed by splicing the reflectors together, or in another embodiment, the light guide is formed by splicing the diffuse reflection sheets G1 of example 3 together with the reflectors in the circumferential direction, and the specific manner of partially forming the diffuse reflection sheets G1 is flexible for those skilled in the art according to the disclosure of the present invention, and is not necessarily listed.
The shape of the light guide is not particularly limited, and the cross section of the light guide may be rectangular (as shown in fig. 4 a), circular, trapezoidal or other irregular shapes, and the appearance of the light guide may be rectangular parallelepiped, trapezoidal, pyramidal or other irregular shapes.
Referring to fig. 4b and 4c, the diffusive reflective plate of the present embodiment is used for manufacturing a light guide tube required by a laser display device, when the diffusive reflective plate works, excitation light emitted by a laser transmits through a selective reflective layer and then enters the diffusive layer through a transmissive layer, the excitation light is reflected by the reflective layer after being scattered by the diffusive layer, and the reflected light is emitted through the diffusive reflective layer, the transmissive reflective layer, and the selective reflective layer; the laser beam is directly reflected by the selective reflection layer, is not incident to the diffusion layer, and is not scattered. Therefore, the light guide pipe not only ensures the light uniformization performance of exciting light, but also ensures that the excited light is not scattered and the brightness of the excited light is not lost.
This embodiment also proposes a light guide of another embodiment, which is different from the aforementioned light guide in that all or part of the tube body has, from inside to outside in the radial direction of the tube body, a selective reflection layer capable of reflecting the stimulated light and transmitting the excitation light, a diffusion layer, and a reflection layer; the diffusion layer can scatter the excitation light emitted by the laser, and the reflection layer is not selective and can reflect the light irradiated to the layer. That is, the tube body of the light guide may be entirely or partially formed of the diffuse reflection sheet described in embodiment 4. The light is incident from the incident end at a certain incident angle, and is emitted from the emergent end after being reflected and/or scattered for multiple times in the transmission channel of the light, so that the speckle problem caused by the exciting light emitted by the laser can be eliminated.
The effect of the light guide of the present embodiment will be described below with reference to fig. 5a and 5 b.
The light guide tube reflects light incident at a certain incident angle for multiple times in the light guide tube with a certain length, thereby realizing integration of spatial and angular distribution of light beams and achieving the purpose of light uniformization.
As shown in fig. 5a, the light guide in the prior art only generates specular reflection when operating, and the light homogenizing effect is poor because the laser has coherence and only reflects.
As shown in fig. 5b, the light guide of this embodiment utilizes the selective reflection layer to reflect the received laser light, the received laser light cannot be scattered because the received laser light cannot penetrate through the selective reflection layer, and the brightness cannot be lost, the laser light as the excitation light can penetrate through the selective reflection layer, enter the diffusion layer, and then be reflected, after passing through the diffusion layer twice, the excitation light is decohered, and the dodging effect is good.
EXAMPLE 7 laser light Source device
The present embodiment provides a laser light source device, which includes the above-mentioned light guide. The laser light source device can be used for laser display equipment, such as a laser projector.
It can be understood by those skilled in the art based on the disclosure of the present specification that in the field of laser display devices, such as laser projectors, the light guide can be flexibly arranged in the laser source device according to the specific characteristics and system requirements of those skilled in the art, for example, the light guide can be arranged to receive the excitation light transmitted by the wavelength conversion device or the emitted stimulated light.
EXAMPLE 8 laser projector
The present embodiment provides a laser projector, including the diffusive reflective plate described in embodiment 1 or embodiment 2, where the diffusive reflective plate is used for homogenizing light and changing an optical axis; or the laser projector comprises the laser light source device of embodiment 5 or embodiment 7; or the laser projector includes the light guide of embodiment 6, which is used for light uniformization.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A diffusion reflection sheet for a laser projector is characterized by comprising a selective reflection layer, a transmission layer, a diffusion layer and a reflection layer which are sequentially arranged; the selective reflecting layer can reflect the stimulated laser and transmit exciting light emitted by the laser; the transmissive layer being capable of transmitting light incident to the layer; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
2. A diffusion reflection sheet for a laser projector, comprising a selective reflection layer, a diffusion layer and a reflection layer, wherein the diffusion layer is arranged between the selective reflection layer and the reflection layer; the selective reflecting layer can reflect the stimulated laser and transmit exciting light emitted by the laser; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
3. A light pipe for a laser projector is characterized by comprising a hollow pipe body, wherein all or part of the pipe body is provided with a selective reflecting layer, a transmission layer, a diffusion layer and a reflecting layer from inside to outside in the radial direction of the pipe body, and the selective reflecting layer can reflect received laser and transmit exciting light emitted by a laser; the transmissive layer being capable of transmitting light incident to the layer; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
4. The optical manifold of claim 3, wherein the tube is formed by splicing all of the diffusive reflective plates of claim 1 or is formed in part by the diffusive reflective plates of claim 1.
5. A light guide for a laser projector, comprising a hollow tubular body, all or part of which has, from inside to outside in a radial direction of the tubular body, a selective reflecting layer, a diffusing layer, and a reflecting layer; the selective reflecting layer can reflect the stimulated laser and transmit exciting light emitted by the laser; the diffusion layer can scatter exciting light emitted by the laser; the reflective layer being capable of reflecting light impinging on the layer; the excited light is light generated by exciting a wavelength conversion material with the excitation light.
6. The optical manifold of claim 5, wherein the tube is formed by splicing all of the diffusive reflective plates of claim 2 or is formed in part by the diffusive reflective plates of claim 2.
7. A laser light source device, characterized in that it comprises a light guide according to any one of claims 3-6.
8. A laser projector comprising a light guide according to any one of claims 3 to 6, said light guide being adapted to homogenize light; or the laser projector comprises the laser light source device according to claim 7.
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| CN201811160148.6A CN110967902B (en) | 2018-09-30 | 2018-09-30 | Diffusion reflection sheet, light guide pipe, laser light source device and projector |
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| CN201811160148.6A CN110967902B (en) | 2018-09-30 | 2018-09-30 | Diffusion reflection sheet, light guide pipe, laser light source device and projector |
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| CN113946091A (en) * | 2020-07-15 | 2022-01-18 | 无锡视美乐激光显示科技有限公司 | Light source structure and projector |
| TWI779988B (en) * | 2022-01-13 | 2022-10-01 | 台達電子工業股份有限公司 | Light source module |
| CN116482923A (en) | 2022-01-13 | 2023-07-25 | 台达电子工业股份有限公司 | Light source module |
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| JP2005107096A (en) * | 2003-09-30 | 2005-04-21 | Dainippon Printing Co Ltd | Projection screen and projection system equipped therewith |
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| JP2016061853A (en) * | 2014-09-16 | 2016-04-25 | セイコーエプソン株式会社 | Light source device and projector |
| JP2016157096A (en) * | 2015-02-20 | 2016-09-01 | 株式会社リコー | Illumination device and image projection device |
| CN205447345U (en) * | 2016-03-01 | 2016-08-10 | 深圳市绎立锐光科技开发有限公司 | Wavelength converters and light source system |
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| CN204648118U (en) * | 2015-05-25 | 2015-09-16 | 广州市雅江光电设备有限公司 | A kind of reflective light conducting cylinder |
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