CN112180661B - Scattering adjusting device, light source and projection system - Google Patents

Abstract

The present invention provides a scattering device comprising: a first scattering region and a second scattering region; wherein the first scattering region and the second scattering region have different haze, and the haze of the first scattering region is less than the haze of the second scattering region. The device can realize the adjustment of the scattering angle of the exciting light so as to meet the haze requirement required by the light source design and ensure the consistency; and the design can reduce the tolerance requirement on the single chip in the past, improve the yield of production and reduce the production cost.

Description

Scattering adjusting device, light source and projection system

Technical Field

The invention relates to the technical field of projection devices, in particular to the field of light sources of projection devices.

Background

In the field of projection, especially in the field of laser projection, it is often necessary to use a scattering sheet in the light source system, and the role of the scattering sheet in the light source system is to change the spatial distribution of the light source, so that the light of the light source passing through the scattering sheet reaches the relatively uniform distribution of the light spots on the wavelength conversion material after passing through the converging system.

However, the conventional scattering sheet often has difficulty in achieving accurate scattering, for example, the conventional scattering sheet is made of glass, and has a transmission surface and a scattering surface on two sides, wherein the transmission surface is coated with an antireflection film, and the scattering surface has a scattering layer and is made by a special process, which mainly functions in changing the directionality of laser. The main problem of the device is that the scattering angle of the manufactured scattering sheet has a certain deviation due to the process limitation, for example, the haze requirement is 1.5 °, the actual production result may have a tolerance of +/-0.3 ° or more, the size of the light spot incident on the wavelength conversion material is also different, and the efficiency of the light source system is different. I.e. because the haze (scattering angle) cannot be precisely controlled, leading to inconsistent system efficiency.

On the other hand, even if the diffusion sheet completely satisfying the predetermined haze is manufactured by increasing the cost, the diffusion sheet has poor versatility due to the difference of the light sources themselves, and it is difficult to adapt to the difference of different light sources. Even with the same light source, the output of the light source often changes with time due to problems such as aging, and therefore, it is difficult for the diffusion sheet to adapt to changes in the output distribution of the light source, and system efficiency cannot be controlled.

The invention aims to provide a haze-adjustable scattering sheet according to the characteristics of a light path so as to solve the problem of deviation of the haze-adjustable scattering sheet, adjust the haze-adjustable scattering sheet on a light source in real time until the maximum efficiency output of the light source is achieved, ensure the consistency of the light source and reduce the cost rise caused by the requirement of over-small tolerance of manufacturers.

Therefore, there is a need for a scattering adjustment device, a light source and a projection system to solve at least one of the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to solve the above technical problem, the present invention provides a scattering device, including: a first scattering region and a second scattering region; wherein the first scattering region and the second scattering region have different haze, and the haze of the first scattering region is less than the haze of the second scattering region.

Further, the scattering device has a first surface and a second surface, wherein the first surface and the second surface are oppositely disposed.

Further, the first scattering region and the second scattering region are both located on the second surface.

Further, the haze value of the first surface is constant.

Further, the second scattering region further comprises a third scattering region and a fourth scattering region, wherein the haze of the third scattering region is less than the haze of the fourth scattering region.

Further, the haze value of the third scattering region or the fourth scattering region is constant.

Further, the haze value of the third scattering region or the fourth scattering region is gradually changed.

Further, the first scattering areas and the second scattering areas are alternately arranged.

Another aspect of the present invention provides a light source, including:

a scattering device as described in the first aspect of the invention; a wavelength conversion member that wavelength-converts the excitation light.

A third aspect of the present invention provides a projection apparatus comprising: the invention provides a light source according to a second aspect.

In summary, the present invention provides a scattering device, including: a first scattering region and a second scattering region; wherein the first scattering region and the second scattering region have different haze, and the haze of the first scattering region is less than the haze of the second scattering region. The device can realize the adjustment of the scattering angle of the exciting light so as to meet the haze requirement required by the light source design and ensure the consistency; and the design can reduce the tolerance requirement on the single chip in the past, improve the yield of production and reduce the production cost.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the drawings:

FIG. 1 is a schematic view of a laser light source arrangement;

FIG. 2 is a schematic view of a diffuser plate;

FIG. 3 is a diagram of a normalized light intensity distribution;

FIG. 4 is a schematic structural diagram of a scattering device according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the distribution of light spots on a diffuser;

FIG. 6 is a schematic diagram illustrating a relationship between a scattering device and a light spot distribution according to another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a scattering device according to yet another embodiment of the present invention;

fig. 8 is a schematic view of a laser light source according to an embodiment of the present invention.

Description of reference numerals:

101 laser light source

102 first lens

103 second lens

104 diffusion sheet

105 dichroic element

106 focusing lens group

107 wavelength conversion device

108 wavelength converting material

111 exciting light

112 scattered back excitation light

113 rear transmission excitation light

114 stimulated luminescence

201 incident light

202 scattered light

203 antireflection film surface

204 scattering layer plane

300 light spot array

301 blank area

302 heavy scattering region

303 light scattering region

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

In the following description, for purposes of explanation, specific embodiments will be set forth in order to provide a thorough understanding of the present invention, and to explain how the present invention ameliorates the problems. It is apparent that the invention may be practiced without limitation to the specific details known to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Fig. 1 is a schematic diagram of a laser light source, which is an exemplary embodiment of a blue laser light source 101 generating excitation light 111, converging the excitation light through a first lens 102 and a second lens 103, scattering the excitation light through a scattering sheet 104 to change the directionality of the laser light, wherein the excitation light 112 after scattering, which is the excitation light with changed directionality, passes through a dichroic element 105 to form transmitted excitation light 113, and this transmitted excitation light 113 is focused by the focusing lens group 106 onto the wavelength converting material 108, producing stimulated excitation light 114, illustratively, the excited light is fluorescence, the excited light 114 is collimated after passing through the focusing lens group 106, reflected by the dichroic element 105 and emitted from another direction, the wavelength conversion material 108 is on the wavelength conversion device 107, the wavelength conversion device 107 has a wavelength conversion region and a transmission region thereon, and the transmitted excitation light is combined with the excited light through a series of mirrors and output. The specific optical path details and other technical solutions are exemplarily shown in fig. 8.

In the laser light source scheme shown in fig. 1, the structure of the used scattering sheet 104 is shown in fig. 2, wherein the scattering sheet includes incident light 201, scattered light 202, an antireflection film surface 203, and a scattering layer surface 204, the main structure of which is glass, and both sides of which are respectively a transmission surface and a scattering surface, wherein the transmission surface is coated with an antireflection film and is also called an antireflection film surface 203, and the scattering surface has a scattering layer, which is also called a scattering layer surface 204, and the main function of which is to change the directionality of laser light.

Illustratively, the diffuser sheet 104 includes a diffuser base substrate sandwiched between the antireflection film face 203 and the diffuser layer face 204, wherein the base substrate may comprise a transparent low-iron non-reinforced glass substrate. When the base substrate is made of transparent non-reinforced glass, the base substrate may be more resistant to heat and water than plastic such as PMMA or acrylic. In addition, although the base substrate is exposed to visible light or ultraviolet light for a long time, the base substrate is not easily changed or warped. Therefore, the life of the base substrate can be extended. In addition, since the transparent non-reinforced glass has higher strength or durability than the acrylic resin or plastic, the base substrate may be formed to have a smaller thickness, for example, a thickness of 1mm or less, than the acrylic resin or plastic. Thus, the base substrate can be more efficiently used for narrow bezel or zero bezel type products.

Illustratively, the diffuser sheet 104 is formed by a lamination process based on a roll-to-roll process, and has a one-sheet or monolithic structure. The antireflection film face 203 and the scattering layer face 204 may be integrated on the front and back surfaces of the base substrate by a roll-to-glass (roll-to-glass) process. When the antireflection film face 203 and the scattering level face 204 are manufactured separately from the base substrate and mounted or laminated on the front surface and the rear surface of the base substrate, the antireflection film face 203 and the scattering level face 204 may be deformed by heat or moisture. Therefore, when antireflection film face 203 and scattering layer face 204 are first formed into a monolithic structure and then laminated on a heat-or moisture-resistant base substrate, the durability of antireflection film face 203 and scattering layer face 204 and the base substrate can be improved, thereby improving the durability of the entire scattering sheet 104.

Illustratively, the diffuser sheet 104 is made of glass, the transparency enhancement film 203 is formed by vacuum deposition, and the diffuser layer 204 is formed by laser etching.

Additionally, the scattering layer 204 may be screen printed on the rear surface of the base substrate, for example, to be integrated with the base substrate. The scattering layer plane 204 may be made of titanium dioxide or silicon dioxide (TiO2/SiO2) or a compound thereof, which increases the strength of the base substrate when it is made of transparent non-reinforced glass, but also increases the transparency of the base substrate.

The main problem of the device shown in fig. 2 is that the scattering angle may have a certain deviation due to the process limitation of manufacturing the scattering sheet, for example, the haze requirement is 1.5 °, the actual production result may have a tolerance of +/-0.3 ° or more, the light spots incident on the wavelength conversion material may have different sizes, and the efficiency of the light source system is different. I.e. because the haze (scattering angle) cannot be precisely controlled, leading to inconsistent system efficiency.

In the foregoing description, the haze refers to the distribution of scattered light after a parallel light beam passes through the scattering surface, which is schematically shown in fig. 3, and fig. 3 shows the distribution of normalized light intensity with respect to angle, as shown in fig. 3, in the light distribution after scattering, when the energy of the edge light intensity is reduced to half of the energy of the central light intensity, the corresponding angle is α, which is the haze of the scattering sheet. Specifically, the light intensity distribution tends to be a symmetrical curve distribution, and when the light intensity of the vertical axis is reduced to 50% of the central light intensity, the corresponding light angles are α, - α, respectively, and then, this angle α is referred to as the haze of the diffuser.

The invention aims to provide a haze-adjustable scattering sheet according to the characteristics of a light path so as to solve the problem of deviation of the haze-adjustable scattering sheet, adjust the haze-adjustable scattering sheet on a light source in real time until the maximum efficiency output of the light source is achieved, ensure the consistency of the light source and reduce the cost rise caused by the requirement of over-small tolerance of manufacturers. Namely, the invention solves the technical problem of adjustable scattering.

Example one

Fig. 4 is a schematic structural diagram of the scattering device of the present invention, and as shown in fig. 4, the scattering device includes a first scattering region and a second scattering region, and the haze of the first scattering region is less than that of the second scattering region. The shaded portion is shown as the second scattering region and the clear portion is shown as the first scattering region, i.e., the clear portion has a haze less than the shaded portion. The scattering device has a first surface and a second surface, wherein the first surface and the second surface are oppositely disposed. Further, the scattering device has two surfaces a and B, and the surface a and the surface B have different scattering structures, where the surface a is the first surface, and the surface B is the second surface, specifically, the surface a is a scattering surface with a uniform whole surface, i.e., the haze value of the first surface is a constant, the surface B is a scattering surface with sub-regions, and the right side is a front view of the surface B, where the scattering angles of the shaded portion and the blank portion are different, i.e., the haze values are different. The first scattering area and the second scattering area are both located on the second surface, and as shown in fig. 4, the blank portion and the shaded portion are both located on the second surface. The first scattering areas and the second scattering areas are alternately arranged. As shown in fig. 4, the blank portions and the shaded portions are alternately arranged.

Illustratively, the scattering device is designed to have a haze of 1.5 °, the haze of the a-plane is designed to be 1.3 ° +/-0.2 °, the anti-reflective region of the clear region of the B-plane is free of scattering effects, i.e., the haze is 0 °, and the haze of the shaded region is designed to be 0.2 °. When the actual haze produced by the surface A is 1.5 degrees, the position of the scattering device in the light path can be adjusted, so that light passes through the anti-reflection region (namely blank part) of the surface B to be scattered by 1.5 degrees, if the actual haze is 1.3 degrees, the position of the scattering sheet is adjusted, the light is emitted from the scattering region (namely shadow part) of the surface B, and the effect of 1.5 degrees is achieved after secondary scattering. The scattering device shown in fig. 4 can be applied to the laser light source scheme shown in fig. 1 as the scattering sheet 104 to solve the technical problem to be solved by the present invention. The haze deviation caused by the manufacturing process of the scattering device can be solved without increasing the cost. And the scattering ability of the scattering sheet can be adjusted according to the change of the light source, so that the light source device not only can adapt to the change caused by aging of a single light source, but also can adapt to the change of different light sources.

Example two

Since the light source generally uses a laser array to provide the excitation light, the excitation light is often distributed in an array form, and when the excitation light is incident on the scattering sheet 104, the distribution of the light spot array 300 on the scattering sheet 104 can be referred to as shown in fig. 5, wherein the light spot distribution is also distributed in an array.

For the excitation light with the spot distribution as shown in fig. 5, the scattering sheet structure as shown in fig. 6 is used for scattering, so as to realize the adjustment of the scattering angle. Specifically, fig. 6 is a front view of the rear end of the diffuser, which corresponds to the viewing angle on the right side (i.e., the B-side) in fig. 4, wherein the adjustment of the diffusion angle is achieved by translating to adjust different positions at which light passes through the diffuser.

Wherein the second scattering region further comprises a third scattering region and a fourth scattering region, wherein the haze of the third scattering region is less than the haze of the fourth scattering region. As shown in fig. 6, the third scattering region is a light scattering region 303, the fourth scattering region is a heavy scattering region 302, and the haze value of the third scattering region or the fourth scattering region is constant. And the diffusion sheet 104 is further provided with a first diffusion region, which is exemplarily a blank region 301. As shown in fig. 6, the light scattering regions 303 and the heavy scattering regions 302 are alternately arranged with the blank regions 301.

Specifically, the surface B in the figure has three scattering layers, so that the difference can be adjusted better and accurately. The three scattering layers are respectively a blank region 301, a heavy scattering region 302 and a light scattering region 303, exemplarily, the blank region 301, the heavy scattering region 302 and the light scattering region 303 are sequentially arranged from right to left, and sequentially circulate, and fig. 6 respectively shows three relations between the three scattering layers and the distribution of the light spots, as shown in the uppermost diagram in fig. 6, the incident positions of the light spot array 300 all correspond to the light scattering region 303, and at this time, each light spot in the light spot array is further lightly scattered; moving the scattering device one unit length to the left to obtain the illustration of the middle position in fig. 6, where the incident positions of the array of spots 300 all correspond to the blank space 301, and each spot in the array of spots is not further scattered; the scattering device is moved further to the left by one unit length to obtain the illustration of the lowermost position in fig. 6, where the incident positions of the array of spots 300 correspond to the re-scattering region 302, and each spot in the array of spots is further heavily scattered.

Illustratively, the scattering device is designed to have a haze of 1.5 °, the haze of the a-plane is designed to be 1.3 ° +/-0.2 °, the antireflective region of the clear space 301 of the B-plane is designed to have no scattering effect, i.e., a haze of 0 °, the haze of the heavy scattering region 302 is designed to be 0.2 °, and the haze of the light scattering region 303 is designed to be 0.1 °. When the actual haze produced by the surface a is 1.5 °, the position of the scattering device in the optical path may be adjusted, so that light passes through the anti-reflection region (i.e., the blank region 301) of the surface B to be scattered by 1.5 °, if the actual haze is 1.3 °, the position of the scattering sheet is adjusted, the light exits from the black region (i.e., the heavy scattering region 302) of the surface B, and after secondary scattering, the effect of 1.5 ° is achieved, if the actual haze is 1.4 °, the position of the scattering sheet is adjusted, the light exits from the gray region (i.e., the light scattering region 301) of the surface B, and after secondary scattering, the effect of 1.5 ° is achieved.

The arrangement of the blank region 301, the heavy scattering region 302 and the light scattering region 303 is merely an exemplary representation, and the arrangement of the three regions may be combined in other manners, which is not particularly limited in the present invention.

The scattering device shown in fig. 4 can be applied to the laser light source scheme shown in fig. 1 as the scattering sheet 104 to solve the technical problem to be solved by the present invention. The haze deviation caused by the manufacturing process of the scattering device can be solved without increasing the cost. And the scattering ability of the scattering sheet can be adjusted according to the change of the light source, so that the light source device not only can adapt to the change caused by aging of a single light source, but also can adapt to different requirements of different light sources on the scattering of haze.

EXAMPLE III

Fig. 7 is a schematic view of a scattering device according to the present invention, and as shown in fig. 7, the scattering device has two surfaces a and B, wherein the surface a and the surface B have different scattering structures, and the surface B is integrally processed on a single surface, so that the regions can change layer by layer, i.e., gradually change.

Wherein the second scattering region further comprises a third scattering region and a fourth scattering region, wherein the haze of the third scattering region is less than the haze of the fourth scattering region. As shown in fig. 7, the third scattering region is a light scattering region 303, the fourth scattering region is a heavy scattering region 302, and the haze value of the third scattering region or the fourth scattering region is gradually changed. As shown in fig. 7, the light scattering regions 303 and the heavy scattering regions 302 are alternately arranged in sequence with the blank regions 301.

Further, the B-side includes a blank region 301, a heavy scattering region 302 and a light scattering region 303, which are arranged in the manner shown in the figure, exemplarily, from right to left, the blank region 301, the heavy scattering region 302 and the light scattering region 303 are sequentially arranged, and are sequentially circulated, and in order to obtain better scattering, the two scattering regions of the B-side heavy scattering region and the light scattering region can be made to be gradually changed, so as to achieve linear adjustment, for example, the light scattering region 303, the light-colored shaded portion in fig. 7, has a gradual change range of haze of 0.5 ° to 1.0 °, and the heavy scattering region 302, the dark-colored shaded portion in fig. 7, has a gradual change range of haze of 1.0 ° to 1.5 °.

The scattering device shown in fig. 7 can also refer to fig. 6, which shows three corresponding relations between the three scattering layers and the distribution of the light spots, and as shown in the uppermost diagram of fig. 6, the incident positions of the light spot array 300 all correspond to the light scattering region 303 in fig. 7, at this time, each light spot in the light spot array obtains further light scattering, and because the scattering degree of the light scattering region 303 in fig. 7 is not uniform step-by-step, when the light spot array is incident to different positions inside the light scattering region 303, different degrees of scattering can be obtained; moving the scattering device one unit length to the left, corresponding to the middle position shown in fig. 6, the incident positions of the array of spots 300 correspond to the blank area 301, and each spot in the array of spots is not further scattered; the scattering device is moved to the left by one unit length, which is similar to the diagram of the lowest position in fig. 6, and the incident positions of the light spot array 300 correspond to the heavy scattering region 302, and each light spot in the light spot array is further heavily scattered, and because the scattering degrees of the heavy scattering region 302 in fig. 7 are not uniformly distributed, when the light spot array is incident to different positions inside the heavy scattering region 302, different degrees of heavy scattering are obtained.

Illustratively, the scattering device is designed to have a haze of 1.5 °, the haze of the a-plane is designed to be 1.3 ° +/-1.3 °, the antireflective region of the blank 301 of the B-plane has no scattering effect, i.e., a haze of 0 °, the haze of the heavy scattering region 302 is designed to be 1.0 ° to 1.5 °, and the haze of the light scattering region 303 is designed to be 0.5 ° to 1.0 °. When the actual haze produced by the surface a is 1.5 °, the position of the scattering device in the optical path may be adjusted, so that light passes through the anti-reflection region (i.e., the blank region 301) of the surface B to generate scattering of 1.5 °, if the actual haze produced by the surface a is 0 ° to 0.5 °, the position of the scattering sheet is adjusted, and the light exits from the black region (i.e., the heavy scattering region 302) of the surface B, and the position of the scattering sheet is adjusted, and the light enters the heavy scattering region 302, and after secondary scattering, the effect of 1.5 ° is achieved, and if the actual haze produced by the surface a is 0.5 ° to 1.0 °, the position of the scattering sheet is adjusted, and the light exits from the gray region (i.e., the light scattering region 303) of the surface B, and after secondary scattering, the effect of 1.5 ° is achieved.

As can be seen from the above examples, the tolerance requirement of the a-plane is extremely relaxed because the B-plane may adjust and supplement the haze of the scattering device, and in this example, even if the a-plane does not obtain the haze, the B-plane can supplement the haze requirement of the scattering device by 1.5 °. Of course, the extreme case is shown in the embodiment to illustrate that the tolerance requirement of the conventional single chip can be sufficiently reduced, the yield of production is improved, and the production cost is reduced.

For example, the arrangement of the blank region 301, the heavy scattering region 302, and the light scattering region 303 is only an exemplary expression, and the arrangement of the three regions may be combined in other manners, which is not particularly limited in the present invention.

Alternatively, in the embodiment shown in fig. 7, a portion of the light scattering region 303 may be selected to have a gradually changing haze, and the haze of the other light scattering regions 303 is constant, and for the same reason, a portion of the heavy scattering region 302 may be selected to have a gradually changing haze, and the haze of the other heavy scattering regions 302 is constant, and optionally, the haze of the light scattering region 303 is constant and the haze of the heavy scattering region 302 is gradually changing, or the haze of the heavy scattering region 302 is constant and the haze of the light scattering region 303 is gradually changing, so that the scattering device may have various combinations by various combinations of the haze regions, and thus, the light source has a greater degree of freedom in selecting the scattering region.

Alternatively, in the first embodiment shown in fig. 4, the haze of the shaded area can be selected to be gradual or constant.

Example four

Fig. 8 shows a schematic diagram of a laser light source according to an embodiment of the present invention, and as shown in fig. 8, the scattering device 104 may be applied to the laser light source and the projection system, and both positions may be applied with the device, so as to achieve quantitative adjustment and ensure the consistency of the light source.

According to the foregoing embodiments, the technical solution of the present invention is explained, and the present invention can realize the adjustment of the scattering angle of the excitation light by the design of different scattering of the sub-regions of the scattering sheet, and the embodiments of the present invention can all solve or partially solve the following technical problems: the haze requirement required by the light source design ensures the consistency; and the design can reduce the tolerance requirement on the single chip in the past, improve the yield of production and reduce the production cost.

The explanation and description of the light source system of the present invention are completed so far, and the complete light source system may further include other elements, which are not described herein again.

The light source system of the present invention can be applied in any application where a composed light is required, including but not limited to a laser projector, such as a monolithic laser projector. The light source system can realize the output of time sequence multicolor light and obtain the time sequence light required by the laser projector.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. It will also be appreciated by persons skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. A scattering device, comprising: a first scattering region and a second scattering region;

wherein the first scattering region and the second scattering region have different haze, and the haze of the first scattering region is less than the haze of the second scattering region;

the second scattering region further comprises a third scattering region and a fourth scattering region, wherein the haze of the third scattering region is less than the haze of the fourth scattering region;

the first scattering area is a blank area, the third scattering area is a light scattering area, the fourth scattering area is a heavy scattering area, and the light scattering area, the heavy scattering area and the blank area are alternately arranged; the incident positions of the light spot arrays correspond to the light scattering areas, and each light spot in the light spot arrays is further slightly scattered; moving the scattering device to the left by a unit length, wherein the incident positions of the light spot arrays correspond to the blank area, and each light spot in the light spot arrays is not further scattered; and the scattering device is continuously moved to the left by one unit length, the incident positions of the light spot arrays correspond to the heavy scattering areas, and each light spot in the light spot arrays is further heavily scattered at the moment.

2. The diffuser device of claim 1, wherein the diffuser device has a first surface and a second surface, wherein the first surface and the second surface are oppositely disposed.

3. A scattering device as claimed in claim 2, wherein both the first scattering region and the second scattering region are located on the second surface.

4. The scattering apparatus of claim 3, wherein the haze value of said first surface is constant.

5. The scattering device of claim 4, wherein the third scattering region or the fourth scattering region has a haze value that is constant.

6. The scattering device of claim 4, wherein the third scattering region or the fourth scattering region has a graded haze value.

7. A scattering device as claimed in claim 1 or 2, wherein said first scattering areas alternate with said second scattering areas.

8. A light source, comprising:

the scattering device of any of claims 1-7;

the light source is an array light source,

a wavelength conversion member that wavelength-converts the excitation light.

9. A projection device, the projection device comprising:

the light source of claim 8.

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