CN111198410B - Scattering element, light source system and display device - Google Patents
Scattering element, light source system and display device Download PDFInfo
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- CN111198410B CN111198410B CN201811378318.8A CN201811378318A CN111198410B CN 111198410 B CN111198410 B CN 111198410B CN 201811378318 A CN201811378318 A CN 201811378318A CN 111198410 B CN111198410 B CN 111198410B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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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
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
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Abstract
The invention provides a scattering element, a light source system and a display device, wherein the scattering element comprises a substrate, and the surface of the substrate is provided with: the reflection scattering layer is arranged in a first area on the surface of the substrate and used for performing reflection type scattering on light rays; the transmission scattering layer is arranged in a second area on the surface of the substrate and is used for performing transmission type scattering on light; wherein the first region and the second region do not overlap. The reflection scattering layer and the transmission scattering layer of the scattering element scatter light, which is beneficial to eliminating the coherence of incident light and can excellently eliminate the speckle phenomenon formed by laser in the incident light.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a scattering element, a light source system and display equipment.
Background
This section is intended to provide a background or context to the specific embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
At present, according to the requirement of human eyes on image color restoration, various color gamut standards can be divided, such as the color gamut standards of Rec709, DCI-P3 and Rec 2020. Please refer to fig. 1, which is a schematic diagram of a plurality of color gamut ranges in CIE1931 coordinate system. As shown in fig. 1, in the CIE1931 coordinate system, the range covered by the various color gamut triangles represents the range of colors that can be visualized, i.e., the color gamut. In the color reduction of an image, images with different color gamuts require different color coordinates of three primary colors provided by a light source, and the color coordinates depend on the spectrums of the three primary colors of the light source, so that generally, a light source system can only display one color gamut standard.
In the existing light source technology, light sources such as bulbs, LEDs, and phosphors are generally used for color gamut display of Rec709 because of wide spectral bandwidth; a three-color pure laser light source is usually used for color gamut display of Rec2020 due to an extremely narrow spectral bandwidth; however, since laser is coherent light, images displayed by pure laser have speckle phenomena, such as stripe shapes as shown in fig. 2, which seriously affect the visual and ornamental experience of people.
Disclosure of Invention
In order to solve the technical problem that speckle appears in an image displayed by laser in the prior art, the invention provides a scattering element capable of effectively weakening the laser speckle phenomenon, and also provides a light source system and display equipment.
A scattering element comprising a substrate, the substrate surface being provided with:
the reflection scattering layer is arranged in a first area on the surface of the substrate and used for performing reflection type scattering on light rays; and
the transmission scattering layer is arranged in a second area on the surface of the substrate and used for performing transmission type scattering on light;
wherein the first region and the second region do not overlap.
Further, the reflection scattering layer at least comprises a first scattering layer and a second scattering layer which are arranged on the surface of the substrate and are not overlapped with each other, and the scattering angles of the first scattering layer and the second scattering layer are different;
the transmission scattering layer at least comprises a fourth scattering layer and a fifth scattering layer which are arranged on the surface of the substrate and are not overlapped with each other, and the scattering angles of the fourth scattering layer and the fifth scattering layer are different.
A light source system, comprising:
a light source for emitting illumination light including laser light;
a scattering element as described above, for receiving the illumination light and scattering the illumination light by the reflective scattering layer and the transmissive scattering layer, respectively; and
a guide device for guiding the illumination light to be transmitted between the first region and the second region.
A light source system, comprising:
a light source for emitting illumination light including laser light, the illumination light including first light and second light, an etendue of the first light being larger than an etendue of the second light; and
a scattering element as described above, in which a first scattering layer and the fourth scattering layer are used for scattering the first light, and a second scattering layer and the fifth scattering layer are used for scattering the second light;
the scattering angle of the first scattering layer is smaller than that of the second scattering layer, and/or the scattering angle of the fourth scattering layer is smaller than that of the fifth scattering layer, so that the scattered first light and the second light emitted from the second region have the same etendue.
A display device comprising a light source system as described above.
The reflection scattering layer and the transmission scattering layer of the scattering element scatter light, which is beneficial to eliminating the coherence of incident light and can excellently eliminate the speckle phenomenon formed by laser in the incident light.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments/modes of the present invention, the drawings needed to be used in the description of the embodiments/modes are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments/modes of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of a plurality of color gamut ranges in the CIE1931 coordinate system.
Fig. 2 is a schematic diagram of laser speckle phenomenon.
Fig. 3 is a schematic structural diagram of a light source system according to a preferred embodiment of the present invention.
Fig. 4 is a schematic top view of the scattering element shown in fig. 3.
Fig. 5 is a timing diagram of a driving current variation of each light emitter in one embodiment of the light source shown in fig. 3.
Fig. 6 is a distribution of illuminance at the entrance of the light uniformizing device when neither the first reflective element nor the second reflective element shown in fig. 3 is used for scattering light.
Fig. 7 is a view illustrating the illuminance distribution at the entrance of the light uniformizing device when the first reflecting element and/or the second reflecting element shown in fig. 3 is a convex mirror or a reflective diffuser.
Fig. 8 is a distribution of illuminance at an entrance of the light uniforming device when the first reflecting element and/or the second reflecting element shown in fig. 3 is a reflective microlens array.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Fig. 3 is a schematic structural diagram of a light source system 20 according to a preferred embodiment of the present invention. The light source system 20 provided by the invention is a laser light source, and can be applied to display equipment such as an education projector, a laser television, a cinema projector, a micro projector and the like.
Please refer to fig. 4, which is a schematic top view of the scattering element 250 shown in fig. 3. The scattering element 250 includes a substrate 251, and the substrate 251 is provided with: a first region 252 and a second region 253 that do not overlap each other. The first region 252 is provided with a reflective scattering layer for reflectively scattering light; the second region 253 is provided with a transmission and scattering layer for transmission-scattering light.
As shown in fig. 3, in the present embodiment, the light emitted from the light source 210 is guided to the first region 252 of the scattering element 250 by the guiding device 230, the illumination light is reflected and scattered by the first region 252 and then enters the second region 253 of the scattering element 250 through the guiding device 230, and the illumination light enters the dodging device 270 after being transmitted and scattered by the second region 253. In other embodiments, the light emitted from the light source 210 is guided to the second region 253 of the scattering element 250 by the guiding device 230 or other optical devices, the illumination light is transmitted and scattered by the second region 253 and then enters the first region 252 of the scattering element 250 through the guiding device 230, and the illumination light enters the light uniformizing device 270 after being reflected and scattered by the first region 253.
The reflection scattering layer and the transmission scattering layer of the scattering element 250 scatter the illumination light twice, thereby further eliminating the coherence of the laser light and excellently eliminating the speckle phenomenon formed by the laser light in the illumination light. The reflection scattering layer and the transmission scattering layer of the scattering element 250 expand the angle distribution of the illumination light beams, so that the angle of the illumination light beams entering the dodging device 270 is matched with that of the dodging device 270, namely, the light beam divergence angle of the illumination light at the entrance of the dodging device 270 is within a preset range, so that the illumination light can be reflected for multiple times in the dodging device 270, and a good dodging effect is obtained.
The scattering element 250 is used for performing reflective scattering and transmissive scattering on incident illumination light, particularly laser light in the illumination light, to expand the etendue of the laser light, which is because the etendue of fluorescence is larger than that of the laser light, and when the laser light which is not scattered is directly used in the existing light source, the angle of the laser light is small, and the homogenization effect by the light uniformizing device 270 is poor; the scattering element 250 also serves to eliminate coherence of the laser light to eliminate discomfort and speckle of the human eye to the laser illumination image.
In an alternative embodiment, the first region 252 and the second region 253 of the scattering element 250 are respectively used for scattering incident light, and can respectively guide the incident light to different optical paths, which is beneficial to reducing the number of optical elements in the light source system 20, and further reducing the volume and cost of the light source system 20.
As shown in fig. 3, the light source 210 includes a first light emitter 211, a second light emitter 212, a third light emitter 213, a light combining component 214, and a light uniformizing device 215. In the present invention, the first light emitter 211 is used for emitting a first light, the second light emitter 212 is used for emitting a second light, and the third light emitter 213 is used for emitting a third light, wherein the first light is a red laser, the second light is a blue laser, and the third light is a green laser, and it is understood that the first light emitter 211, the second light emitter 212, and the third light emitter 213 may be a laser or a laser array. The first light, the second light and the third light may be laser lights of other colors. The light combining component 214 is used for guiding the first light, the second light and the third light to the same optical path and emitting the light from the light source 210.
Since the first light, the second light, and the third light have extremely narrow wavelength bandwidths, and there is no overlap between wavelengths and a large interval, the light combining element 214 can combine light efficiently by combining wavelengths.
In the embodiment of wavelength light combination, the light combination component 214 includes a first light combination element 214a and a second light combination element 214b which are arranged in a crossed manner. The first light combining element 214a is used to guide the first light and the second light to exit along the same optical path, and may be a red-reflective blue-transmissive dichroic plate. The second light combining element 214b is used to guide the second light and the third light to exit along the same optical path, and may be a reflective green and transparent blue dichroic plate.
The light homogenizing device 215 may be a compound eye or an optical integrator rod for homogenizing the light emitted from the light combining assembly 214, it being understood that the light homogenizing device 215 is not necessary, especially in the following miniaturized light source system.
As shown in fig. 3, the light source system 20 further includes a driving device 260, the scattering element 250 is periodically rotated around the rotation center under the driving of the external driving device 260, and the first region 252 and the second region 253 are spaced from the rotation center at different distances. As shown in fig. 4, the substrate 251 is circular, and the rotation center is the center of the substrate 251. The first region 252 and the second region 253 are both annular, and the outer diameter of the first region 252 is smaller than or equal to the inner diameter of the second region 253. The second region 253 is disposed at the edge of the substrate 251, the first region 252 is disposed between the geometric center of the substrate 251 and the second region 253, the first region 252 and the second region 253 may be disposed adjacent to each other or spaced apart from each other, and the geometric center (center of circle) of the bottom surface of the substrate 251 is used for connecting the driving device 260. In a modified embodiment, the scattering element 250 is a fixed scattering element and does not move or rotate with time.
In one embodiment, the reflective scattering layer and/or the transmissive scattering layer are both gaussian scattering layers, that is, the ratio of small-angle rays in the emergent rays of the reflective scattering layer and the transmissive scattering layer is relatively large, and the light intensity distribution of the emergent rays conforms to a gaussian curve.
The reflection scattering layer comprises a first scattering layer R1, a second scattering layer B1 and a third scattering layer G1 which are all arranged on the surface of the substrate 251 and do not overlap with each other, and the transmission scattering layer comprises a fourth scattering layer R2, a fifth scattering layer B2 and a sixth scattering layer G2 which are all arranged on the surface of the substrate 251 and do not overlap with each other. In this embodiment, the first scattering layer R1 and the fourth scattering layer R2 are disposed at 180 degrees with respect to the geometry of the surface of the substrate 251; the second scattering layer B1 and the fifth scattering layer B2 are arranged at 180 degrees relative to the geometry of the surface of the substrate 251; the third scattering layer G1 and the sixth scattering layer G2 are disposed at 180 degrees with respect to the geometry of the surface of the substrate 251. It is understood that, in other embodiments, the relative position relationship between the reflective scattering layer and the corresponding color section in the transmissive scattering layer can be flexibly set according to the position relationship between the incident light rays of the reflective scattering layer and the incident light rays of the transmissive scattering layer. In other embodiments, the reflective scattering layer is used for reflecting and scattering incident light, and the transmissive scattering layer is used for transmitting and scattering incident light, that is, the scattering element 250 does not have corresponding sections on the reflective scattering layer and the transmissive scattering layer according to the color of the incident light, and the scattering element 250 in this embodiment is used for emitting the incident light, especially laser light, after twice scattering, and the rotation phase of the scattering element 250 does not need to be synchronized with the color of the incident light.
Under the driving of the driving device 260, the first scattering layer R1, the second scattering layer B1 and the third scattering layer G1 are alternately positioned on the optical path of the illumination light. In the embodiment in which the illumination light emitted from the light source 210 passes through the second region 253 and is then irradiated onto the first region 252, the fourth scattering layer R2, the fifth scattering layer B2, and the sixth scattering layer G2 are alternately positioned on the optical path of the illumination light under the drive of the drive device 260.
Further, the scattering angles of the first scattering layer R1 and the second scattering layer B1 may be different, and the scattering angles of the fourth scattering layer R2 and the fifth scattering layer B2 may be different. In this embodiment, the etendue of the red laser light emitted by the light source 210 is greater than the etendue of the green laser light and the blue laser light, and accordingly, the scattering angles of different scattering layers in the scattering element 250 can be adjusted to adjust the etendue of the incident illumination light, so that the illumination lights of different colors emitted by the scattering element 250 enter the dodging device 270 with the same etendue, so as to improve the dodging effect.
The first scattering layer R1 is used for reflecting and scattering the first light, the first light scattered by the first scattering layer R1 enters the fourth scattering layer R2, and enters the light uniformizing device 270 after being scattered and transmitted by the fourth scattering layer R2. Accordingly, the second scattering layer B1 and the fifth scattering layer B2 are used for scattering the second light in a reflective manner and in a transmissive manner, and the third scattering layer G1 and the sixth scattering layer G2 are used for scattering the third light in a reflective manner and in a transmissive manner. Wherein the scattering angle of the first scattering layer R1 is smaller than that of the second scattering layer B1; or the scattering angle of the fourth scattering layer R2 is smaller than that of the fifth scattering layer B2; or the scattering angle of the first scattering layer R1 is smaller than that of the second scattering layer B1, and the scattering angle of the fourth scattering layer R2 is smaller than that of the fifth scattering layer B2, so that the scattering element 250 emits the scattered first light with the same etendue as the second light.
It is understood that, in order to reduce or eliminate the difference between the etendue of the second light and the etendue of the third light emitted from the scattering element 250, the scattering angle of the second scattering layer B1 and the third scattering layer G1, and/or the scattering angle of the fifth scattering layer B2 and the sixth scattering layer G2 may be adjusted according to the relationship between the etendue of the second light and the third light.
In one embodiment, the angular distribution of the light beam entering the light uniformizing device 270 is different due to the difference in the number and arrangement of the lasers in the first light emitter 211, the second light emitter 212 and the third light emitter 213, and thus the uniformity or efficiency of the light source system 20 is poor.
In the etendue transforming relationship, the angular distribution of the outgoing light rays from the first region 252 and the second region 253 in the scattering element 250 directly determines the angular distribution of the incident dodging device 270. In the embodiment in which the reflection scattering layer and/or the transmission scattering layer is an elliptical gaussian scattering layer or a microlens array, the angular distribution of the illumination light beam can be independently expanded in two orthogonal directions, and the scattering angles in different scattering layers can be adjusted, so that the angular distributions of different illuminants entering the light uniformizing device 270 are controlled to be matched, that is, the angular distributions of different illuminants entering the light uniformizing device 270 are all within a preset range, so as to improve the uniformity of the emergent light.
The driving device 260 drives the scattering element 250 to rotate periodically, and the first scattering layer R1, the second scattering layer B1 and the third scattering layer G1 are located on the optical path of the illumination light periodically. The timing driving of the first light emitter 211, the second light emitter 212, and the third light emitter 213 needs to be synchronized with the scattering element 250. In one embodiment, the dominant wavelength of the second light is greater than 460nm, and the color coordinates of the dominant wavelength of the second light can completely match the color gamut standard of Rec.2020 without the need to correct the color coordinates of the second light. In the present embodiment, when the first scattering layer R1 is located on the optical path of the illumination light, the light source 210 emits the first light; when the second scattering layer B1 is located on the optical path of the illumination light, the light source 210 emits the second light, and when the third scattering layer G1 is located on the optical path of the illumination light, the light source 210 emits the third light, thereby ensuring that only one color light is emitted at a time. Accordingly, in the embodiment in which the illumination light emitted from the light source 210 is irradiated to the first region 252 after passing through the second region 253, when the fourth scattering layer R2 is located on the optical path of the illumination light, the light source 210 emits the first light; when the fifth scattering layer B2 is located on the optical path of the illumination light, the light source 210 emits the second light, and when the sixth scattering layer G2 is located on the optical path of the illumination light, the light source 210 emits the third light.
Fig. 5 is a timing diagram illustrating a variation of driving current of each light emitter in one embodiment of the light source 210 shown in fig. 3. In one embodiment, the dominant wavelength of the second light is in the range of 445-455nm, and the color coordinates thereof cannot completely match the color gamut standard of Rec.2020, so that when the second scattering layer B1 is located on the optical path of the illumination light, the light source 210 turns on the third light emitter 213 to emit the third light to correct the color coordinates of the second light. That is, when the first scattering layer R1 is located on the optical path of the illumination light, the light source 210 emits the first light; when the second scattering layer B1 is located on the optical path of the illumination light, the light source 210 emits a mixture of the second light and the third light, and at this time, the optical power of the second light is greater than that of the third light; when the third scattering layer G1 is located on the optical path of the illumination light, the light source 210 emits third light. As shown in fig. 5, the optical power can be adjusted by adjusting the drive current of the light. Accordingly, in the embodiment in which the illumination light emitted from the light source 210 is irradiated to the first region 252 after passing through the second region 253, when the fourth scattering layer R2 is located on the optical path of the illumination light, the light source 210 emits the first light; when the fifth scattering layer B2 is located on the optical path of the illumination light, the light source 210 emits a mixture of the second light and the third light, and at this time, the optical power of the second light is greater than that of the third light; when the sixth scattering layer G2 is located on the optical path of the illumination light, the light source 210 emits the third light.
The guiding device 230 is used for guiding the illumination light emitted from the scattering element 250 to transmit between the first region 252 and the second region 253, and the illumination light emitted from the light source 210 is irradiated to the scattering element 250 through the guiding device 230 or other optical devices. In this embodiment, the guiding device 230 is used for guiding the illumination light emitted from the light source 210 to the first region 252 of the scattering element 250, and for guiding the light reflected from the first region 252 to the second region 253.
As shown in fig. 3, the guiding device 230 specifically includes a collecting lens group 231, a first reflective element 232, a second reflective element 234 and relay lenses 233 and 235. The illumination light emitted by the light source 210 passes through the collection lens group 231 and is focused near the first region 252 on the surface of the scattering element 250, and after being reflected by the first region 252, the incident illumination light and the emergent illumination light of the first region 252 are at least partially separated by the optical path according to the reflection principle. The illumination light emitted from the first region 252 sequentially enters the second region 253 through the collimation of the collection lens group 231, the reflection of the first reflecting element 232, the relay of the relay lens 233, the reflection of the second reflecting element 234, and the relay of the relay lens 235, and enters the dodging device 270 through the second region 253.
In the light source system, the light spot of the illumination light converged on the surface of the phosphor generates light spot diffusion, however, the light spot does not expand when the light spot of the illumination light is converged on the surface of the scattering element 250, so that when the illumination light spot is coupled into the light uniformizing device 270, the light spot of the illumination light is small, as shown in fig. 6, which is not beneficial to improving the uniformity of the light output of the light source system 20. Therefore, the first reflecting element 232 and/or the second reflecting element can be designed to make the light spot of the illumination light at the entrance of the light uniformizing device 270 match with the shape of the entrance of the light uniformizing device 270, which is beneficial to fully utilizing the optical expansion of the light uniformizing device 270, and the illumination light can be reflected and scattered in the light uniformizing device 270 for more times, so that the uniformity of the emergent light of the light uniformizing device 270 is improved, and the speckle phenomenon of the laser can be further eliminated.
As shown in fig. 3, in the process that the illumination light spot exits from the scattering element 250 through the light path formed by the collection lens group 231 and the relay lenses 233 and 235 and finally enters the dodging device 270, the first reflecting element 232 and/or the second reflecting element 234 is at or near the aperture stop position of the light path, so that the angular distribution of the light beam exiting from the first reflecting element 232 and/or the second reflecting element will be converted into the illuminance distribution entering the dodging device 270 in the etendue conversion relation.
In one embodiment, the first reflective element 232 is a convex mirror or a reflective diffuser. In a preferred embodiment, the first reflective element 232 is a convex mirror with small curvature or a small angle scattering sheet, that is, the curvature of the first reflective element 232 is smaller than the preset curvature or the scattering angle is smaller than the preset angle, so as to play a certain role of decoherence on the illumination light beam, and the angle distribution emitted by the first reflective element 232 obtains the same increment in each direction, so that the illumination distribution of the illumination light spot entering the light uniformizing device 270 is diffused as shown in fig. 7, the ratio of the filling light at the inlet of the light uniformizing device 270 is larger than the preset value, thereby improving the uniformity of the light emitted by the light uniformizing device 270, and further eliminating the speckle phenomenon of the laser. It is understood that the preset value can be 80%, 90%, 95%, etc., and can be flexibly selected according to the requirement of the light source system 20 on the light uniformity.
In an embodiment, the first reflective element 232 is a reflective microlens array to perform decoherence and shaping on the illumination light beam, the curvature and the length-width ratio of each microlens unit in the microlens array can be set, and further the angle distribution emitted by the first reflective element 232 is independently expanded in two orthogonal directions, the ratio of the filling light at the inlet of the light uniformizing device is greater than a preset value, so that the illumination light spot illumination distribution entering the light uniformizing device 270 is diffused as shown in fig. 8, which is beneficial to improving the uniformity of the light emitted by the light uniformizing device 270, and the speckle phenomenon of the laser can be further eliminated.
It is understood that the above-described embodiments for the first reflective element 232 and the second reflective element 234 are equally applicable within the spirit and scope of the present invention, and therefore, for the sake of brevity and to avoid repetition, further description is omitted.
In the invention, the light emitted from the light source 210 is guided to the first region 252 of the scattering element 250, the illumination light is reflected and scattered by the first region 252 and then enters the second region 253 of the scattering element 250, and the illumination light enters the dodging device 270 after being transmitted and scattered by the second region 253. The reflection scattering layer and the transmission scattering layer of the scattering element 250 scatter the illumination light twice, thereby further eliminating the coherence of the laser light and excellently eliminating the speckle phenomenon formed by the laser light in the illumination light. The reflection scattering layer and the transmission scattering layer of the scattering element 250 expand the angle distribution of the illumination light beams, so that the angle of the illumination light beams entering the dodging device 270 is matched with that of the dodging device 270, namely, the divergence angle of the illumination light at the entrance of the dodging device 270 is within the preset angle range, so that the illumination light can be reflected for multiple times in the dodging device 270, and a good dodging effect is obtained.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several of the means recited in the apparatus claims may also be embodied by one and the same means or system in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (13)
1. A scattering element, comprising a substrate, a surface of the substrate being provided with:
the reflection scattering layer is arranged in a first area on the surface of the substrate and used for performing reflection type scattering on light rays; and
the transmission scattering layer is arranged in a second area on the surface of the substrate and is used for performing transmission type scattering on the light;
wherein the first region and the second region do not overlap; the substrate is circular, the first area and the second area are both annular, and the outer diameter of the first area is smaller than or equal to the inner diameter of the second area.
2. A scattering element as claimed in claim 1, wherein the scattering element is periodically rotated about a center of rotation by a driving means, and the first region and the second region are spaced from the center of rotation by different distances.
3. The scattering element of claim 1, wherein said reflective scattering layer comprises at least a first scattering layer and a second scattering layer that are both disposed on said substrate surface and do not overlap each other, and wherein said first scattering layer and said second scattering layer have different scattering angles;
the transmission scattering layer at least comprises a fourth scattering layer and a fifth scattering layer which are arranged on the surface of the substrate and are not overlapped with each other, and the scattering angles of the fourth scattering layer and the fifth scattering layer are different.
4. A scattering element as claimed in claim 3, wherein the first scattering layer and the fourth scattering layer are disposed at 180 degrees with respect to a geometric center of the substrate surface; the second scattering layer and the fifth scattering layer are arranged at 180 degrees with respect to a geometric center of the substrate surface.
5. The scattering element of claim 3, wherein said reflective scattering layer further comprises a third scattering layer that does not overlap said first scattering layer and said second scattering layer; the transmission scattering layer further includes a sixth scattering layer that does not overlap with the fourth scattering layer and the fifth scattering layer.
6. A scattering element as claimed in any of claims 1-5, wherein the reflective scattering layer and/or the transmissive scattering layer is a Gaussian scattering layer or a microlens array.
7. A light source system, comprising:
a light source for emitting illumination light including laser light;
a scattering element as claimed in any one of claims 1 to 6 for receiving the illumination light and scattering it by the reflective scattering layer and the transmissive scattering layer, respectively; and
and the guiding device is used for guiding the illumination light emitted by the scattering element to be transmitted between the first region and the second region.
8. The light source system of claim 7, wherein the guiding device comprises a first reflective element for scattering the light emitted from the first region and guiding the light to the second region;
the light source system further comprises a light homogenizing device, and light rays emitted from the second area enter the light homogenizing device from an inlet of the light homogenizing device.
9. The light source system of claim 8, wherein the first reflective element is a convex mirror, a reflective diffuser sheet, or a reflective microlens array.
10. A light source system, comprising:
a light source for emitting illumination light including laser light, the illumination light including at least first light and second light, an etendue of the first light being larger than an etendue of the second light; and
a scattering element according to claim 3, wherein the first scattering layer and the fourth scattering layer are used for scattering the first light, and the second scattering layer and the fifth scattering layer are used for scattering the second light;
the scattering angle of the first scattering layer is smaller than that of the second scattering layer, and/or the scattering angle of the fourth scattering layer is smaller than that of the fifth scattering layer, so that the scattered first light and the second light emitted from the second region have the same etendue.
11. The light source system according to claim 10, further comprising a driving device disposed on a bottom surface of the scattering element, wherein the scattering element is driven by the driving device to periodically rotate around a rotation center, the first scattering layer and the second scattering layer are periodically located on an optical path of the illumination light, or the fourth scattering layer and the fifth scattering layer are periodically located on the optical path of the illumination light;
when the first scattering layer or the fourth scattering layer is positioned on the light path of the illumination light, the light source emits first light; when the second scattering layer or the fifth scattering layer is located on the optical path of the illumination light, the light source emits the second light.
12. The light source system of claim 10,
the reflection scattering layer further comprises a third scattering layer which is not overlapped with the first scattering layer and the second scattering layer; the transmission scattering layer further comprises a sixth scattering layer which is not overlapped with the fourth scattering layer and the fifth scattering layer;
the light source system further comprises a driving device arranged on the bottom surface of the scattering element, and the first scattering layer, the second scattering layer and the third scattering layer are periodically located on the light path of the illumination light or the fourth scattering layer, the fifth scattering layer and the sixth scattering layer are periodically located on the light path of the illumination light under the driving of the driving device;
the light source is also used for emitting third light;
when the first scattering layer or the fourth scattering layer is positioned on the light path of the illumination light, the light source emits the first light; when the second scattering layer or the fifth scattering layer is located on the optical path of the illumination light, the light source emits the second light, or the light source emits mixed light of the second light and the third light, and at this time, the optical power of the second light is greater than that of the third light; when the third scattering layer or the sixth scattering layer is located on the optical path of the illumination light, the light source emits the third light.
13. A display device characterized by comprising a light source system according to any one of claims 7 to 12.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811378318.8A CN111198410B (en) | 2018-11-19 | 2018-11-19 | Scattering element, light source system and display device |
| PCT/CN2019/119154 WO2020103784A1 (en) | 2018-11-19 | 2019-11-18 | Scattering element, light source system and display device |
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| CN201811378318.8A CN111198410B (en) | 2018-11-19 | 2018-11-19 | Scattering element, light source system and display device |
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| CN111198410B true CN111198410B (en) | 2022-08-12 |
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| WO2020103784A1 (en) | 2020-05-28 |
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