CN108153093B - Color wheel - Google Patents
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- CN108153093B CN108153093B CN201810015436.6A CN201810015436A CN108153093B CN 108153093 B CN108153093 B CN 108153093B CN 201810015436 A CN201810015436 A CN 201810015436A CN 108153093 B CN108153093 B CN 108153093B
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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
- G03B21/208—Homogenising, shaping of the illumination light
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Abstract
The invention discloses a color wheel, which comprises a color wheel,receiving laser light source irradiation, wherein the laser light source irradiation comprises a fluorescence area and a first transmission area, the fluorescence area is used for receiving the laser irradiation and generating fluorescence of at least one color, the first transmission area is used for transmitting the laser, and the light incident surface and the light emergent surface of the first transmission area are both provided with microstructures; the divergence degree c of the laser beam after passing through the first transmission area approximately satisfies:
wherein, a and b are the divergence degrees of the laser beams passing through the light incident surface and the light emergent surface of the first transmission region respectively. The color wheel component provided by the invention has diversified functions.
Description
The present application is a divisional application of chinese patent application 201510948988.9 entitled "a light source and a laser projection apparatus" filed on 12/18/2015.
Technical Field
The invention relates to the technical field of projection display, in particular to a light source for projection display.
Background
The laser light source is used as a solid-state light source, and has a series of advantages of high brightness, high efficiency, long service life, good color gamut, environmental protection and the like, so that the laser light source becomes a choice of a new projection light source.
At present, in the laser light source used in the industry, the first color wheel is used for generating fluorescence except for laser color, the fluorescence and the laser form three primary colors together, the purity of the fluorescence is improved by filtering the fluorescence through the second color wheel, and the three primary colors with higher purity are finally output in a time sequence manner, so that the brightness of a picture projected by the laser light source is improved, and the color gamut is good. In the prior art, a first color wheel is shown in fig. 1 as an example, and includes a fluorescent region 11 and a transmissive region 12, where the fluorescent region 11 is coated with at least one phosphor, such as green phosphor and yellow phosphor, and can be sequentially excited by laser irradiation to generate fluorescence of corresponding colors. The transmissive region 12 is typically transparent glass for transmitting blue laser light. And the fluorescence and the laser are combined and then enter the second color wheel component. In the prior art, a second color wheel component is shown in fig. 2 and is composed of a plurality of color filters, including color filter regions 21 and 22 and a transmission region 23. The color filter 21 may be a green filter, the color filter 22 may be a red filter, so as to filter the green and yellow fluorescence respectively to obtain green and red lights with higher purity, and the transmission region 23 is typically transparent glass for transmitting the blue laser. The first color wheel 01 and the second color wheel 02 keep synchronous rotation, and three primary colors of light are output in time sequence, and finally a projection picture with bright color is formed.
Disclosure of Invention
The invention discloses a light source which comprises a laser, a first color wheel and a second color wheel, wherein microstructures are arranged on the light incoming surface and the light outgoing surface of a laser transmission area of the first color wheel or the second color wheel, so that the functions of diffusing and eliminating speckles of laser transmitted by the area can be achieved, and the functions of the first color wheel or the second color wheel are diversified.
The purpose of the invention is realized by the following technical scheme:
a light source includes a laser emitting laser light of at least one color; the first color wheel comprises a fluorescence area and a first transmission area, the fluorescence area is used for receiving laser irradiation and generating fluorescence of at least one color, and the first transmission area is used for transmitting laser; the second color wheel comprises a color filtering area and a second transmission area, the color filtering area is used for receiving fluorescence of at least one color and filtering the output, the second transmission area is used for transmitting laser of at least one color, and microstructures are arranged on the light incident surface and the light emergent surface of the first transmission area or the second transmission area;
furthermore, the microstructures of the light incident surface and/or the light emergent surface of the first transmission region are arranged from sparse to dense to sparse along the circumferential direction of the first color wheel; and/or the presence of a gas in the gas,
the microstructures of the light incident surface and/or the light emergent surface of the second transmission area are arranged from sparse to dense along the circumferential direction of the second color wheel.
Furthermore, the first transmission area or the second transmission area is made of a diffusion sheet or a ground glass material.
Further, the microstructure particle size is 10 μm or less.
Further, the microstructures are formed by a photolithography process.
Further, the microstructure is formed as a coating of scattering particles.
Further, the laser emits blue laser light, the first transmission region includes a blue light transmission region, and the second transmission region is the blue light transmission region.
Or, further, the laser emits blue laser light and red laser light, the first transmission region includes a first blue light transmission region and a first red light transmission region, and the second transmission region includes a second blue light transmission region and a second red light transmission region.
Furthermore, the microstructures of the light incident surface and the light emergent surface of the first transmission region are respectively arranged along the radial direction and the circumferential direction of the first color wheel; and/or the presence of a gas in the gas,
the microstructures of the light incident surface and the light emergent surface of the second transmission area are arranged along the radial direction and the circumferential direction of the second color wheel respectively.
Further, the thickness of the diffusion sheet or the ground glass is less than or equal to 0.7mm
The invention also provides a laser projection device which comprises a light source, an optical machine, a lens and a screen, wherein the light source adopts the light source of any technical scheme.
The technical scheme of the embodiment of the invention at least has the following technical effects or advantages:
the light source provided by the technical scheme of the embodiment of the invention comprises a laser, a first color wheel and a second color wheel, wherein microstructures are arranged on the light inlet surface and the light outlet surface of a laser transmission area on the first color wheel or the second color wheel, and along with the periodic rotation of the first color wheel or the second color wheel, laser can be diffused by the microstructures on the surface when being incident into the light inlet surface of the transmission area of the corresponding color wheel, a certain number of spatial random phases are generated on the laser beam, the interference condition can be destroyed by the generation of the random phases, the coherence property of the laser can be weakened, and when being emitted from the light outlet surface of the transmission area of the corresponding color wheel, the microstructures on the light outlet surface can be diffused again, the random phases are generated again, the coherence property of the laser is further weakened, a plurality of independent speckle patterns are formed in a picture formed by projecting the light source, and the integration effect of, the speckle effect of the picture is greatly reduced. Therefore, the laser can also eliminate speckles while being transmitted and output through the first color wheel or the second color wheel, so that the first color wheel has a wavelength conversion function and can also eliminate speckles on the laser, or the second color wheel has a color filtering function and can also eliminate speckles on the laser, and the first color wheel or the second color wheel is multifunctional.
Meanwhile, the first color wheel or the second color wheel of the scheme can eliminate the spots of the laser, so that a separate spot-eliminating component can be omitted or reduced in a light source framework, and the simplification of the light source framework and the compression of the light source volume are facilitated.
The laser projection device provided by the technical scheme of the embodiment of the invention can output three primary colors in a time sequence by applying the light source of the technical scheme, simultaneously better disperse spots for laser, improve the quality of projected images, and can save or reduce the use of a single spot-dispersing component in a light source framework, thereby being beneficial to the simplification of the light source framework, the compression of the light source volume and the miniaturization of the projection device.
Drawings
FIG. 1 is a schematic plan view of a first color wheel in the prior art;
FIG. 2 is a schematic plan view of a second prior art color wheel;
FIG. 3 is a schematic view of a light source structure according to a first embodiment of the present invention;
FIG. 4A is a schematic sectional plan view of a second color wheel according to one embodiment of the present invention;
fig. 4B is a schematic view of another plane partition structure of the second color wheel according to the first embodiment of the present invention;
FIGS. 5A and 5B are schematic cross-sectional views of a microstructure according to a first embodiment of the invention;
fig. 6 is a schematic plane sectional view of a first color wheel according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a light source structure according to a third embodiment of the present invention;
fig. 8 is a schematic plane sectional view of a first color wheel according to a third embodiment of the present invention;
fig. 9 is a schematic plane sectional view of a second color wheel according to a fourth embodiment of the present invention;
fig. 10 is a schematic view of a light source structure according to a fifth embodiment of the invention;
11A and 11B are schematic diagrams respectively illustrating the arrangement directions of the microstructures in the fifth embodiment of the present invention;
FIG. 12 is a schematic diagram of a Gaussian profile of a laser;
fig. 13 is a schematic diagram of a transverse cross-sectional structure of a second color wheel according to a fifth embodiment of the present invention;
fig. 14 is a schematic view of a laser projection apparatus according to a sixth embodiment of the invention;
fig. 15 is a schematic structural diagram of a sixth embodiment of a laser projection apparatus according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example one
The present invention is directed to a light source, as shown in fig. 3, including a laser 10, where laser light emitted from the laser 10 is incident on a first color wheel 20, and along with periodic rotation of the first color wheel, the first color wheel 20 receives partial laser light irradiation and generates fluorescence and transmits partial laser light, and the fluorescence and transmitted laser light are combined by a light combining component 40 and then incident on a second color wheel 30, and after being filtered and transmitted by the second color wheel 30, the fluorescence and transmitted laser light sequentially outputs three primary colors of light, and finally enters a light bar 50 for homogenization, so as to provide illumination for an optical machine part.
Specifically, the laser 10 may be a group or a plurality of groups, for example, two groups arranged vertically, and combines the two groups into one beam through a beam combining lens to emit, in this embodiment, the laser 10 emits blue laser light.
Because the area of the light beam emitted by the laser is large, the light beam needs to be shaped into a light spot meeting the requirement of fluorescence excitation, as shown in fig. 3, the laser beam is also contracted by the telescope system 11, so that the area of the light spot of the laser is reduced.
In this embodiment, the first color wheel 20 includes a fluorescent region and a first transmission region, wherein the fluorescent region includes green phosphor and yellow phosphor, the fluorescent region and the first transmission region are both distributed along an outer circumference of the first color wheel 20, and the blue laser spot sequentially irradiates the outer circumference region, can sequentially excite the corresponding phosphor region to generate green phosphor and yellow phosphor, and transmits out from the first transmission region. In one embodiment, the first color wheel 20 is a reflective color wheel, the fluorescence generated by excitation is specularly reflected by an aluminum substrate of the first color wheel, emitted in a direction opposite to the incident direction of the laser, and reaches the light combining component 40, the blue laser passes through a relay loop formed by a plurality of lenses and returns to the front surface of the first color wheel 20 again, and is also converged to the light combining component 40, specifically, the light combining component 40 may be a dichroic sheet, and is coated to allow the reflection of the blue laser and the transmission of the green fluorescence and the yellow fluorescence.
And the combined three-color light reaches the second color wheel 30, as described above, the second color wheel includes a filter, which can filter the fluorescence and improve the purity of the fluorescence, and in the embodiment of the present invention, the light incident surface and the light emitting surface of the second transmission region of the second color wheel are both provided with microstructures, which can diffuse and eliminate the speckle while transmitting the blue laser.
Specifically, as shown in fig. 4A, the second color wheel 30 includes a green filter 31 for filtering green fluorescence, a red filter 32 for filtering yellow fluorescence to obtain red fluorescence, and a second transmission region 33, where the second transmission region 33 may be made of a diffusion sheet material, or may be ground glass, and a thickness of the diffusion sheet or the ground glass is less than or equal to 0.7mm, that is, the diffusion sheet or the ground glass under the existing process conditions may be processed and formed.
The diffusion sheet is a diffusion sheet of a scattering type or a diffractive type, and the transmittance of the diffusion sheet of a scattering type is slightly inferior to that of the diffractive type in the effect of scattering spots due to the diffractive type.
Microstructures are arranged on the light incident surface and the light emergent surface of the diffusion sheet or the ground glass, wherein the granularity of the microstructures is less than or equal to 10um and less than the granularity of the common diffusion sheet of about 40-50 um. The microstructure can be formed by a photoetching process or can be a scattering particle layer coated on the surface of the transmission region, and the purpose of the microstructure is to form non-polished surfaces on the two side surfaces of the transmission region and to form a diffusion effect on laser.
As shown in fig. 5A and fig. 5B, the cross-sectional structure of the second transmission area of the second color wheel is an enlarged schematic view, the microstructure may be a plurality of saw-tooth-shaped protrusions, or circular protrusions, or other irregular patterns, which is not specifically limited herein, and the microstructure has an effect of scattering incident laser beams, and since the reflection surface is a non-planar surface, the angles and directions of the reflected laser beams spread are diverse, which is beneficial to forming a plurality of random spatial phases to weaken the coherence of the laser beams.
The shapes of the microstructures of the light incident surface and the light emergent surface of the second transmission region can be the same or different.
The microstructures may be uniformly or non-uniformly distributed over the surface of the second transmissive region. In consideration of the gaussian distribution characteristics of the laser, as shown in fig. 10, the intensity of light near the optical axis is relatively large, and the coherence is also strongest, so in the embodiment of the present invention, the arrangement of the microstructures on the light incident surface or the light emergent surface or the microstructures on both surfaces of the second transmission region is set as follows: arranged from sparse to dense in the circumferential direction of the second color wheel or in the direction of rotation of the second color wheel as shown in fig. 4B. Therefore, when the laser facula irradiates the microstructure surface of the second transmission area, the relatively dense microstructure area can diffuse the light beam part with larger energy proportion near the optical axis of the laser facula to a higher degree, the decoherence efficiency is improved, and the relatively sparse microstructure area can diffuse the light beam part with a certain divergence angle and smaller energy proportion of the laser facula to a certain degree, so that the effect of relatively homogenizing the diffusion effect of the whole laser beam is achieved, and the coherence of the laser beam is weakened.
In the embodiment of the present invention, since the light incident surface and the light emitting surface of the second transmission region are both provided with the microstructures, the laser light is diffused twice when transmitting the region, wherein assuming that the divergence degree is a after the diffusion of the light incident surface and b after the diffusion of the light emitting surface, the divergence degree of the laser beam is c after passing through the entire transmission region microstructure, and the three are approximately satisfied: a is2+b2＝c2。
The microstructure arrangement density degree of the light incident surface and the light emergent surface of the second transmission region can be the same or different.
In the embodiment of the invention, the incident surface and the emergent surface of the second transmission area of the second color wheel are both provided with the microstructures, so that the transmission area is equivalent to a moving diffusion sheet, laser can be diffused by the microstructures on the surface when being incident into the incident surface of the second transmission area, a certain number of spatial random phases are generated for laser beams, the generation of the random phases can destroy interference conditions, the coherence property of the laser can be weakened, and when being emitted from the emergent surface of the transmission area, the laser can be diffused by the microstructures arranged on the emergent surface again, the generation of the random phases is caused again, the coherence property of the laser is further weakened, and the two-time diffusion can be carried out through one component.
And aiming at the Gaussian distribution characteristic of the laser, the microstructures of at least one surface of the second transmission area are arranged from sparse to dense to sparse along the circumferential direction of the second color wheel or along the rotating direction of the second color wheel, so that the light beam part near the optical axis of the laser, which has stronger coherence and larger energy proportion, can be diffused to a stronger degree, and the decoherence efficiency is improved.
Through the technical scheme, a plurality of independent speckle patterns are formed in the picture formed by the light source projection, and the speckle effect of the picture is greatly weakened by utilizing the integration effect of human eyes. Therefore, the laser can be transmitted and output through the second color wheel, and meanwhile speckle can be eliminated, so that the functions of the second color wheel component are diversified.
Meanwhile, the second color wheel can eliminate the spots of the laser, so that a separate spot-eliminating component can be omitted or reduced in the light source framework, and the simplification of the light source framework and the compression of the volume of the light source are facilitated.
Example two
The difference between the second embodiment of the present invention and the first embodiment of the present invention is that, in the embodiment of the present invention, as shown in fig. 6, microstructures are disposed on both the light incident surface and the light emitting surface of the first transmission region 22 of the first color wheel 20, so that the blue laser can be transmitted and the speckle can be eliminated by diffusion.
The first transmission area of the first color wheel and the second transmission area of the second color wheel are both used for transmitting laser, the two transmission areas keep synchronous with the rotation of the two color wheels, that is, the relative positions are unchanged, and the areas are the same in size, except that in the first color wheel, the first transmission area is generally arranged in the outer circumferential area of the color wheel, the second transmission area in the second color wheel is generally arranged in a fan-shaped area, and the two transmission areas are structurally similar, so as to the arrangement mode of the microstructure of the first transmission area 22 in the first color wheel, reference may be made to specific contents in the first embodiment, and details are not repeated herein. Therefore, the first color wheel can perform wavelength conversion and simultaneously can perform speckle elimination on the transmitted laser, so that the first color wheel is multifunctional, the use of speckle elimination components in a system can be omitted or reduced, and the reduction of the volume of a light source framework is facilitated.
EXAMPLE III
In the third embodiment of the present invention, as shown in fig. 7, in this embodiment, the laser emits two colors of laser light, that is, the blue laser 11 emits blue laser light, the red laser 12 emits red laser light, the two colors of laser light enter the light combining component 40 after being focused and condensed to be combined, and the light combining component 40 may be a dichroic sheet, and can transmit the blue laser light and reflect the red laser light.
The combined blue laser light and red laser light are both incident on the first color wheel 20, and correspondingly, as shown in fig. 8, the first color wheel 20 includes a fluorescent region 21, a first blue light transmission region 22, and a first red light transmission region 23 (composed of sub transmission regions 231, 232, and 233), where the fluorescent region 21 includes green phosphor, and since the wavelength of the blue laser light is short, the blue laser light is used as laser excitation light to excite the green phosphor to emit green phosphor. The blue laser light and the red laser light are respectively incident to different regions of the surface of the first color wheel 20 according to the lighting timing of the blue laser light and the red laser light, and the position where the first color wheel 20 rotates. Specifically, when the blue laser is turned on, a part of the blue laser is irradiated to the green phosphor region to excite and generate green fluorescence, in this embodiment, the first color wheel 20 is a transmissive first color wheel, and a reflective film is further disposed on an outer surface of the green phosphor region, and is capable of reflecting the fluorescence incident on the surface, so that the fluorescence returns to a back surface of the first color wheel and is emitted in a direction consistent with an incident direction of the laser. And, according to the change of the rotational position of the first color wheel, a part of the blue laser light passes through the blue laser transmission region of the first color wheel 20 to be emitted from the back surface of the first color wheel 20. When the red laser is turned on, the first color wheel 20 rotates to a red laser transmission region position, and the red laser passes through the transmission region and is emitted from the back surface of the first color wheel. Accordingly, the red laser light, the blue laser light, and the green fluorescence are sequentially emitted from the back surface of the first color wheel 20. The three color lights emitted from the back of the first color wheel 20 sequentially enter the second color wheel 30, and are filtered and transmitted by the second color wheel 30 to output three primary colors in a time sequence.
In the third embodiment of the present invention, the light incident surface and the light emitting surface of the first blue light transmission region 22 and the first red light transmission region 23 are provided with microstructures, and the specific shape and arrangement rule of the microstructures of each laser transmission region can be referred to the setting description of the microstructures in the first embodiment of the present invention.
And, the double-sided microstructures of the first blue-transmitting region 22 may be uniformly distributed, or may be uniformly distributed on one side and non-uniformly distributed on the other side, for example, according to the density arrangement described in the first embodiment.
With the first red light transmission region 23, in consideration of the high degree of speckle sensitivity of the human eye to the red laser light, the microstructure arrangement in the red laser light transmission region is set to a divergence angle larger than that in the blue laser light transmission region in order to equalize the degrees of speckle of the two color laser lights.
Specifically, in the embodiment of the present invention, the first red light transmission region 23 may include a plurality of sub-transmission regions, and the plurality of sub-transmission regions may be in a fan shape or may be a plurality of circular arc segments through which the laser spot passes. Referring to fig. 8, the light source module may include sub-transmission regions 231, 232, and 233, wherein the micro-structure arrangement of the sub-transmission regions may be in an arrangement from sparse to dense along the circumferential direction of the first color wheel, a divergence angle of the sub-transmission region 232 located in the middle region of the plurality of sub-transmission regions to the red laser is larger than divergence angles of the sub-transmission regions 231 and 233 located in the two side regions, and an area of the sub-transmission region 232 located in the middle region of the plurality of sub-transmission regions is larger than areas of the sub-transmission regions 231 and 233 located in the two side regions, so that the light beam near the optical axis may be diverged to a greater degree according to a gaussian distribution characteristic of the red laser, and a degree and efficiency of decoherence may be improved.
And, the microstructures of both faces of the first blue light transmission region 22 may also be arranged with reference to the arrangement rule of the first red light transmission region 23, which is not limited herein.
The light source provided in the third embodiment of the present invention is a two-color laser light source, and correspondingly, the first color wheel and the second color wheel are both provided with two-color laser transmission regions, specifically, the first color wheel is respectively provided with a blue light transmission region and a red light transmission region, and the divergence angle of the red light transmission region to the red laser is larger than the divergence angle of the blue light transmission region to the blue laser, so that the decoherence effect to the red laser can be improved; and according to the Gaussian distribution characteristics of the laser, dividing the first red light transmission area into a plurality of sub transmission areas, arranging the sparse and dense arrangement of the microstructures of the sub transmission areas from sparse to dense, and pertinently improving the decoherence effect of the light beam component with stronger red laser coherence.
The third embodiment of the present invention is based on the first embodiment, and the same parts as those in the first embodiment are not described herein again.
Example four
A difference between the fourth embodiment of the present invention and the third embodiment is that, as shown in fig. 9, the second color wheel 30 may specifically include a green filter region 31, a second blue light transmission region 32 and a second red light transmission region 33, wherein microstructures are disposed on the light incident surface and the light emergent surface of the second blue light transmission region 32 and the second red light transmission region 33, and the arrangement manner of the microstructures in the second blue light transmission region 32 and the arrangement manner of the microstructures in the second red light transmission region 33 may refer to the arrangement manner of the first blue light transmission region 22 and the first red light transmission region 23 in the third embodiment, and the process and the operation effect are similar to those in the third embodiment, and are not repeated herein.
EXAMPLE five
A fifth embodiment of the present invention provides a light source, as shown in fig. 10, different from the second embodiment, in the light source provided in the fifth embodiment of the present invention, the red laser emitted by the red laser 12 does not emit to the first color wheel 20, but is arranged in parallel with the optical path of the blue laser emitted by the blue laser 11, correspondingly, in the fifth embodiment of the present invention, the first color wheel 20 only needs to be provided with a first blue light transmission region, and sequentially emits the blue laser and the green fluorescence from the back surface thereof, and reaches the light combining part 40, wherein both the light incident surface and the light emergent surface of the first blue light transmission region are provided with microstructures, and specifically, the arrangement manner of the microstructures can be referred to in the first embodiment or the third embodiment.
In the fifth embodiment of the present invention, the second color wheel 30 is disposed as shown in the sub-regions of the second color wheel in the fourth embodiment, and also includes a second blue light transmission region and a second red light transmission region, where, different from the fourth embodiment, the directions of the microstructures in the light incident surface and the light emergent surface of the second blue light transmission region or the second red light transmission region or both transmission regions are both at a certain angle.
Specifically, taking the second blue light transmission region as an example, for example, the microstructures of the light incident surface and the microstructures of the light emergent surface of the second blue light transmission region are both as shown in fig. 4A, and the cross section is triangular or V-shaped, the microstructures of the light incident surface can be arranged along the circumferential direction or the rotation direction of the second color wheel, as shown in direction 2 in fig. 11B, and as shown in fig. 4A, the second color wheel is longitudinally sectioned. And arranging the microstructures of the light-emitting surface along the rotation center of the second color wheel as a center in the radial direction, as shown in direction 1 of fig. 11A, or performing a cross-section perpendicular to the radial direction of the second color wheel along the second color wheel, so as to obtain the shape shown in fig. 13.
According to the scheme, the arrangement directions of the microstructures of the light inlet surface and the light outlet surface are at a certain angle, such as vertical or approximately vertical, the laser irradiation surface or the reflection surface of the microstructure is correspondingly at a certain angle, such as vertical or approximately vertical, in this way, the microstructures of the two surfaces are easy to present diversity to the diffusion direction and the diffusion angle of the laser, the probability that the spatial phases formed by two times of diffusion are the same for the laser beam is reduced, the number of random phase patterns is increased, decoherence of the laser is facilitated, and therefore, the image speckles formed by the light source are homogenized and weakened within the integral response time of human eyes, and the effect of eliminating the speckles is achieved.
Similarly, the microstructures of the second red light transmitting region may be arranged with reference.
In the above example, the microstructures of the light incident surface and the light emergent surface of the transmission region have the same shape, but in another embodiment, the microstructures may be different.
The above-mentioned arrangement direction of the microstructures of the light incident surface and the light emergent surface of the laser transmission region forms a certain angle, and the scheme is also applicable to the first blue light transmission region of the first color wheel.
The light source provided in the fifth embodiment of the present invention is also a bicolor laser light source, and the microstructures of the light incident surface and the light emergent surface of the blue laser transmission region or the red laser transmission region or the two transmission regions are arranged in different arrangement directions, so that the diversity of laser diffusion directions and angles can be increased, a plurality of random phase patterns can be generated, the decoherence of laser is further facilitated, and the speckle elimination effect of the light source is improved.
In one or more embodiments of the present invention, the laser transmission region of the first color wheel or the second color wheel is provided with microstructures on both the light incident surface and the light emitting surface, so that the laser transmission region area is equivalent to a moving diffusion sheet, and the laser can be diffused by the microstructures on the surface when entering the light incident surface and the light emitting surface of the transmission region, so that the laser can be diffused twice by one component.
And aiming at the Gaussian distribution characteristic of the laser, the microstructures of at least one surface of the laser transmission area are arranged from sparse to dense to sparse along the circumferential direction or the rotating direction of the first or second color wheel, so that the light beam part near the optical axis of the laser, which has strong coherence and large energy proportion, can be diffused to a strong degree, and the decoherence efficiency is improved.
And the blue laser transmission area and the red laser transmission area are distributed in the first or second color wheel structure of the two-color laser light source, and the divergence angle of the red laser transmission area to the red laser is larger than that of the blue laser transmission area to the blue laser, so that the decoherence effect to the red laser can be improved, and the effect that the laser speckle degrees of the two colors are consistent is achieved.
And the arrangement directions of the microstructures of the light incident surface and the light emergent surface of the laser transmission area are different, for example, the microstructures are at an approximately right angle, so that the diversity of the diffusion direction and the angle of the laser can be increased, a plurality of random phase patterns are generated, the decoherence of the laser is further facilitated, and the speckle-dissipating effect of the light source is improved.
Therefore, through the technical scheme, a plurality of independent speckle patterns are formed in the picture formed by the light source projection, and the speckle effect of the picture is greatly weakened by utilizing the integration effect of human eyes. Therefore, the laser can be transmitted and output through the first color wheel or the second color wheel, and meanwhile speckle can be eliminated, so that the function of the second color wheel component is diversified.
Meanwhile, the first color wheel or the second color wheel can eliminate the spots of the laser, so that a separate spot-eliminating component can be omitted or reduced in the light source framework, and the simplification of the light source framework and the compression of the light source volume are facilitated.
EXAMPLE six
A sixth embodiment of the present invention provides a laser projection apparatus, as shown in fig. 12, including a light source 1, an optical machine 2, a lens 3, and a screen 4, specifically, the light source 1 may be the light source in the above-mentioned embodiment one or embodiment two or embodiment three or embodiment four or embodiment five, the light source 1 provides illumination for the optical machine 2, a core component of the optical machine 2 is a DMD, and the DMD modulates light and then enters the lens 3.
In a specific implementation, as shown in fig. 13, with the light source in the fifth embodiment, the three primary colors of light are output by the second color wheel 30 and enter the light rod 50, the light rod 50 is used as a light-homogenizing component to homogenize the light beam and send the homogenized light beam to the illumination system (not shown in the figure) of the optical engine 2, the illumination system projects the light beam onto the DMD chip 60, and after driving, the DMD60 outputs the modulated light beam to the ultra-short focus lens 70 for imaging, and finally projects the imaged light beam onto a projection screen (not shown in the figure) or other media to form an ornamental picture.
According to the laser projection device provided by the invention, the second color wheel component can output three primary colors in a time sequence manner, and meanwhile, the microstructures are arranged on the light inlet surface and the light outlet surface of the transmission region, so that laser is subjected to better speckle elimination, the quality of a projected image is improved, and due to the multi-functionalization of the second color wheel, the use of a single speckle elimination component in a light source framework can be omitted or reduced, the simplification of the light source framework and the compression of the light source volume are facilitated, and the miniaturization of the laser projection device is facilitated.
Similarly, the laser projection apparatus provided by the present invention may also apply the light source as in the second embodiment or the fourth embodiment, so that the first color wheel component can perform wavelength conversion and perform speckle elimination on the transmitted laser, so that the first color wheel is multifunctional, and the use of a separate speckle elimination component in the light source framework can be omitted or reduced, which is beneficial to the simplification of the light source framework, the compression of the light source volume, and the miniaturization of the laser projection apparatus.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A color wheel receiving laser light source illumination, comprising a fluorescent area for receiving laser illumination and generating fluorescence of at least one color, and a first transmissive area for transmitting the laser light, wherein,
microstructures are arranged on the light incident surface and the light emergent surface of the first transmission region; the granularity of the microstructure is less than or equal to 10 μm;
the divergence degree c of the laser beam after passing through the first transmission area approximately meets the following conditions:
and a and b are the divergence degrees of the laser beams passing through the light incident surface and the light emergent surface of the first transmission region respectively.
2. The color wheel of claim 1, wherein the microstructures of the light incident surface and/or the light emergent surface of the first transmission region are arranged from sparse to dense to sparse along the circumferential direction of the color wheel.
3. The color wheel of claim 1 or 2 wherein the first transmissive region is a diffuser or a ground glass material.
4. The color wheel of claim 3 wherein the microstructures are formed by a photolithographic process.
5. A color wheel according to claim 3 wherein the microstructures are formed as a coating of scattering particles.
6. The color wheel of claim 1 wherein the laser light source comprises a blue laser and the first transmissive region comprises a blue light transmissive region.
7. The color wheel of claim 1 wherein the laser light source comprises a blue laser and a red laser, and the first transmissive region comprises a first blue light transmissive region and a first red light transmissive region.
8. The color wheel of claim 1, wherein the microstructures of the light incident surface and the light emergent surface of the first transmission region are arranged along a radial direction and a circumferential direction of the color wheel, respectively.
9. A color wheel according to claim 3 wherein the diffuser or frosted glass has a thickness of 0.7mm or less.
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| CN201810015436.6A CN108153093B (en) | 2015-12-18 | 2015-12-18 | Color wheel |
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| CN201810015436.6A CN108153093B (en) | 2015-12-18 | 2015-12-18 | Color wheel |
| CN201510948988.9A CN105573030B (en) | 2015-12-18 | 2015-12-18 | A kind of light source and laser projection device |
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| CN201510948988.9A Division CN105573030B (en) | 2015-12-18 | 2015-12-18 | A kind of light source and laser projection device |
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| CN201810015436.6A Active CN108153093B (en) | 2015-12-18 | 2015-12-18 | Color wheel |
| CN201810016464.XA Active CN108255006B (en) | 2015-12-18 | 2015-12-18 | Diffusion sheet |
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| CN107340679A (en) * | 2017-01-24 | 2017-11-10 | 深圳晗竣雅科技有限公司 | The method for improving projection image resolution ratio is repeatedly imaged by mirror tilt |
| TWI632421B (en) * | 2017-05-19 | 2018-08-11 | 台灣彩光科技股份有限公司 | Optical wheel |
| CN112147837B (en) * | 2017-08-18 | 2021-11-05 | 青岛海信激光显示股份有限公司 | Two-color laser light source and laser projector |
| CN112099295B (en) * | 2017-08-18 | 2021-11-05 | 青岛海信激光显示股份有限公司 | Two-color laser light source and laser projector |
| CN108398804B (en) * | 2018-03-28 | 2023-07-25 | 四川长虹电器股份有限公司 | Laser speckle eliminating light path and laser projection light source system |
| CN110389487A (en) * | 2018-04-17 | 2019-10-29 | 深圳光峰科技股份有限公司 | Light supply apparatus and display equipment |
| JP7240590B2 (en) * | 2018-10-02 | 2023-03-16 | カシオ計算機株式会社 | Optical wheel, light source device and projection device |
| WO2020125070A1 (en) * | 2018-12-19 | 2020-06-25 | 青岛海信激光显示股份有限公司 | Laser light source and laser projector |
| CN111338166A (en) * | 2018-12-19 | 2020-06-26 | 青岛海信激光显示股份有限公司 | Laser light source and laser projector |
| CN111665579A (en) * | 2019-03-08 | 2020-09-15 | 台湾彩光科技股份有限公司 | Diffusion color wheel with different haze and illumination module of projection device |
| CN111983879A (en) * | 2019-05-24 | 2020-11-24 | 中强光电股份有限公司 | Optical element and projection device |
| WO2021051226A1 (en) * | 2019-09-16 | 2021-03-25 | Materion Precision Optics (Shanghai) Limited | Reflective diffuser for reducing laser speckle and reflective luminescent wheel including same |
| CN114063372A (en) * | 2020-07-30 | 2022-02-18 | 中强光电股份有限公司 | Filter module and projection device |
| CN113093398B (en) * | 2021-04-09 | 2023-01-06 | 青岛海信激光显示股份有限公司 | Speckle eliminating assembly, light source device and control method of light source device |
| CN114415387A (en) * | 2021-12-31 | 2022-04-29 | 中国科学院微电子研究所 | Device and method for improving laser uniformity |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105573030B (en) | 2017-12-19 |
| CN105573030A (en) | 2016-05-11 |
| CN108153093A (en) | 2018-06-12 |
| CN108287449B (en) | 2020-03-24 |
| CN108287449A (en) | 2018-07-17 |
| CN108255006A (en) | 2018-07-06 |
| CN108255006B (en) | 2020-03-24 |
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