CN214474387U - Wavelength conversion device and projection system - Google Patents

Abstract

The embodiment of the application provides a wavelength conversion device and a projection system, and belongs to the technical field of projection. The wavelength conversion device comprises a driving part, a substrate, a light-scattering area and a fluorescent area. The light scattering area or the substrate is fixedly connected with the driving piece, and the light scattering area is used for eliminating speckles of the supplementary light beams and emitting scattered light beams. The fluorescent area is located the one side that the base plate deviates from the driving piece, has coated phosphor powder on the fluorescent area to make fluorescent area produce the fluorescence light beam under the excitation of excitation light beam. The integral wavelength conversion device is formed by integrating the fluorescent area and the light scattering area, so that the tricolor light can be output in time sequence, better speckle dissipation effect can be performed on the tricolor laser, and the quality of a projected image is improved. The optical device is beneficial to reducing independent speckle dissipation parts, simplifying the optical structure, reducing the production cost, and being beneficial to compressing the whole volume of the optical machine, so that the product is miniaturized.

Description

Wavelength conversion device and projection system

Technical Field

The present application belongs to the field of projection technology, and particularly relates to a color wheel laser phosphor technology, and more particularly, to a wavelength conversion device and a projection system.

Background

With the development of projection display technology, laser light is gradually used as a light source in recent years for application in the field of projection display technology because of its advantages of high brightness and strong directivity and being capable of emitting monochromatic coherent light beams.

However, since laser light has high coherence, a speckle effect is inevitably generated as a light source transmission facet. In general, an additional astigmatic color wheel, a random phaser, or a multimode fiber is added to eliminate speckle, so as to reduce the speckle effect caused by the laser beam.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to provide a wavelength conversion device and a projection system, for example, to improve the above-mentioned problems.

The embodiment of the application can be realized as follows:

in a first aspect, a wavelength conversion device is provided, which includes a driving member, a substrate, a light-scattering region and a fluorescent region. The base plate includes fluorescence area, and scattered light district or base plate and driving piece fixed connection scatter the district and be used for eliminating the speckle and the emergent scattered light beam to supplementary light beam. The fluorescent area is located the one side that the base plate deviates from the driving piece, and the fluorescent area coats and is coated with phosphor powder so that the fluorescent area produces the fluorescence light beam under excitation of excitation light beam.

Further, the base plate includes the medial surface, and the astigmatism district includes lateral surface and lower surface, and the lower surface and the driving piece fixed connection in astigmatism district, the lateral surface and the medial surface fixed connection of base plate in astigmatism district.

Further, the light diffusion region includes a first light diffusion region and a second light diffusion region different in divergence half angle. The first light scattering area is fixedly connected with the driving piece, and the second light scattering area is arranged on the periphery of the first light scattering area in a surrounding mode and is positioned on the inner side of the substrate; or the first light scattering area and the second light scattering area are both of fan-shaped structures, and the first light scattering area and the second light scattering area are spliced into a circle.

Furthermore, the substrate comprises a first surface and a second surface which are opposite to each other, the fluorescent area is located on the first surface, the driving piece is fixed on the second surface, and the light scattering area is fixedly connected with the substrate or the driving piece.

Furthermore, the protruding connecting portion that is equipped with of first surface of base plate, scattered light zone is fixed with connecting portion, and scattered light zone and fluorescence district stagger in the footpath along the driving piece.

Further, the light diffusion region is fixed to the peripheral sidewall of the driver or the second surface of the base plate.

Furthermore, the second surface of the substrate or the side wall of the driving part is provided with a conical part, the conical part comprises a conical surface which forms an included angle with the central axis of the driving part, and the light scattering area is attached to the conical surface.

Furthermore, the fluorescent lamp also comprises a filtering color ring, wherein the filtering color ring is fixedly connected with the outer side surface of the substrate, the filtering color ring and the fluorescent area are staggered in the radial direction of the driving piece, and the filtering color ring is used for filtering the fluorescent light beams emitted to the filtering color ring. The fluorescent light beam generated by exciting the fluorescent powder in the fluorescent area can be guided to the filtering color ring by the optical guide element and is emitted after being filtered and color-modified by the filtering color ring.

Furthermore, the light scattering area is adhered to the outer side wall of the filtering color ring, the light scattering area comprises an inclined side surface, and an included angle is formed between the inclined side surface and the central axis of the driving piece, so that the transmission direction of the scattered light beam emitted after the supplementary light beam emitted to the light scattering area is dissipated is changed.

In a second aspect, a projection system is provided that includes a light source and a wavelength conversion device.

Further, the light source comprises a first light source, a second light source and a third light source which are used for emitting exciting light, the wavelength conversion device is arranged in a transmission light path of the light source, fluorescent powder coated on the fluorescent area is sequentially excited under the irradiation of the first light source to generate fluorescent light beams, and the scattered light beams are emitted after the scattered light beams are scattered by the scattered light area to the second light source and the third light source which are incident on the scattered light area.

Further, the fluorescent light source further comprises a first optical guiding element which is arranged in a transmission light path of the first light source and guides and emits fluorescent light beams generated by exciting fluorescent powder in the fluorescent area.

Furthermore, the light source further comprises a second optical guiding element which is arranged in the transmission light path of the second light source and the third light source and guides the scattered light beams emitted after the scattered light beams are scattered by the light scattering area.

The wavelength conversion device provided by the embodiment of the application integrates the fluorescence area and the astigmatism area into a whole wavelength conversion device, can output tricolor light in a time sequence, and can perform a better speckle dissipation effect on tricolor laser, so that the quality of a projected image is improved. The optical device is beneficial to reducing independent speckle dissipation parts, simplifying the optical structure, reducing the production cost, and being beneficial to compressing the integral volume of the optical machine, so that the product is miniaturized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a cross-sectional view of a structure of a wavelength conversion device according to an embodiment of the present disclosure;

FIG. 2 is a top view of a structure of a wavelength conversion device according to an embodiment of the present disclosure;

fig. 3 is a cross-sectional view of a connection structure of a wavelength conversion device according to an embodiment of the present application;

FIG. 4 is a cross-sectional view of another structure of a wavelength conversion device provided by an embodiment of the present application;

fig. 5 is a top view of another structure of a wavelength conversion device according to an embodiment of the present disclosure;

fig. 6 is a cross-sectional view of another connection structure of a wavelength conversion device according to an embodiment of the present application;

FIG. 7 is a cross-sectional view of another structure of a wavelength conversion device provided by an embodiment of the present application;

FIG. 8 is a top view of another structure of a wavelength conversion device according to an embodiment of the present application;

fig. 9 is a cross-sectional view of a fourth structure of a wavelength conversion device according to an embodiment of the present application;

fig. 10 is a top view of a fourth structure of a wavelength conversion device according to an embodiment of the present application;

fig. 11 is a cross-sectional view of a fourth connection structure of a wavelength conversion device according to an embodiment of the present application;

fig. 12 is a cross-sectional view of a fifth structure of a wavelength conversion device according to an embodiment of the present application;

fig. 13 is a top view of a fifth structure of a wavelength conversion device according to an embodiment of the present application;

fig. 14 is a cross-sectional view of a sixth structure of a wavelength conversion device according to an embodiment of the present application;

fig. 15 is a cross-sectional view of a seventh structure of a wavelength conversion device according to an embodiment of the present application;

fig. 16 is a cross-sectional view of an eighth structure of a wavelength conversion device according to an embodiment of the present application;

fig. 17 is a cross-sectional view of a ninth structure of a wavelength conversion device according to an embodiment of the present application;

FIG. 18 is a structural diagram of a structure of a projection system according to an embodiment of the present disclosure;

FIG. 19 is a schematic structural diagram of another configuration of a projection system according to an embodiment of the present disclosure;

FIG. 20 is a schematic structural diagram of another structure of a projection system according to an embodiment of the present disclosure;

FIG. 21 is a schematic diagram illustrating a fourth exemplary configuration of a projection system according to an embodiment of the present disclosure;

FIG. 22 is a schematic structural diagram of a fifth configuration of a projection system according to an embodiment of the present disclosure;

fig. 23 is a schematic structural diagram of a sixth structure of a projection system according to an embodiment of the present application.

Icon: 100-a wavelength conversion device; 105-a receiving block; 110-a drive member; 120-a substrate; 122-a connecting portion; 125-a conical section; 130-a light-scattering area; 132-a first light-scattering region; 134-a second light scattering area; 140-a fluorescent zone; 150-filter color circle; 200-a projection system; 201-a first light source; 203-a second light source; 205-a third light source; 210-a zone diaphragm; 212-a first lens; 214-a second lens; 216 — first mirror; 220-a third lens; 222-a second mirror; 224-third mirror.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.

With the development of technology, projection display devices are favored by more consumers because they can implement a wider color gamut (e.g., DCI-P3 rec.2020 color gamut). In the field of projection display, laser fluorescence has the advantages of high efficiency and high brightness, and is widely applied in the fields of illumination, display and projection.

Laser phosphor technology, in which a laser beam excites a phosphor to generate fluorescence, generally uses a blue laser as excitation light. In the visible range, the energy of the photons varies inversely with wavelength, and the shorter the wavelength, the more energetic the photons, so that when the phosphor is excited by a short-wavelength blue laser, the more energetic blue laser photons are absorbed by the phosphor material and the less energetic long-wavelength fluorescent photons are released. However, the fluorescence spectrum generated by the fluorescent material generated at the same time is wide, so that the purity of the primary light of the corresponding color is insufficient, and the color gamut of the light source has poor performance.

In addition, laser, as a light source emitting a monochromatic coherent light beam, has the advantages of high brightness and strong directivity, and is gradually applied to the technical field of projection display as a light source. However, since laser has high coherence, when used as a light source, the laser can form speckle in the projection imaging process, which seriously affects the display quality of the final projected image.

In general, an additional fluorescent filter and an astigmatic color wheel are required to eliminate the speckle. Or a random phaser, a multimode fiber and other devices are used to eliminate speckle to reduce the speckle effect caused by the laser beam, but these structures result in a complicated and bulky optical structure.

In view of the above problems, embodiments of the present application provide a wavelength conversion device, which integrates a fluorescent wheel and an astigmatism wheel, and forms an integral structure, so that tricolor light can be output in a time-sequential manner, and simultaneously, a good speckle eliminating effect can be performed on tricolor laser light, thereby improving the quality of a projected image. On one hand, the independent speckle dispersing component is reduced, so that the whole volume of the optical-mechanical compressor is facilitated, and the miniaturization of the product is realized. On the other hand, because only one wavelength conversion device is needed to realize speckle elimination and wavelength conversion at the same time, the optical structure of the wavelength conversion device is effectively multiplexed, and the production cost is reduced.

Specifically, referring to fig. 1, a schematic view of a structure of a wavelength conversion device 100 according to an embodiment of the present disclosure is shown. The wavelength conversion device 100 may include a driver 110, a substrate 120, an astigmatism region 130, and a fluorescence region 140.

The driving member 110 is a power source and can drive the wavelength conversion device 100 to rotate. The light-scattering area 130 or the substrate 120 is fixedly connected to the driving member 110, the substrate 120 is used to carry the phosphor area 140, the phosphor area 140 (i.e. the excitation area) can be obtained by coating phosphor powder on a specific area of the substrate 120, and the phosphor area 140 can be located on the upper surface or the lower surface of the substrate 120.

The upper surface of the substrate 120 refers to a side of the substrate 120 away from the driving element 110, that is, the fluorescent region 140 is disposed on a side of the substrate 120 away from the driving element 110. The light-emitting region 130 is fixedly connected to the driving member 110, the substrate 120 is fixedly connected to the outer circumference of the light-emitting region 130, and a fluorescent region 140 is formed by coating phosphor on a specific region of the substrate 120. When the supplementary beam is emitted onto the light diffusion region 130, the light diffusion region 130 can destroy the coherence of the laser light so that the laser light becomes uniform. In this process, the wavelength properties of the laser light itself do not change, and only the irregular intensity distribution before astigmatism becomes uniform, thereby generating a scattered beam.

The fluorescence area 140 is used for stimulated generation of fluorescence and scattering in lambert light, and the astigmatism area 130, the fluorescence area 140, the substrate 120 and the driving member 110 may form a whole and be disposed in a transmission light path of a light source capable of emitting excitation light, thereby realizing function multiplexing of the wavelength conversion device 100, reducing the volume of the light path, and reducing the related cost.

It is understood that the substrate 120 in the embodiment of the present application may be specifically a reflective substrate, and the material of the reflective substrate may be a ceramic substrate or a metal substrate, so as to facilitate heat dissipation.

Alternatively, referring to fig. 1 and 2, the light diffusion region 130 may be fixedly connected to the substrate 120 and the driver 110, and in this structure, the light diffusion region 130 is located at an inner circle of the phosphor region 140.

Specifically, the fluorescent region 140 and the substrate 120 may be both circular ring structures, the light diffusion region 130 may be a circular plate structure, the substrate 120 includes an inner side, and the light diffusion region 130 includes a lower surface and an outer side matched with the inner side of the substrate 120 in size. The lower surface of the light diffusion area 130 is fixedly connected with the driving member 110, and the outer side surface of the light diffusion area 130 is fixedly connected with the inner side surface of the substrate 120.

Alternatively, phosphor zones 140 may include, but are not limited to, red, green, and blue segments at various angles. High-strength bonding can be performed between the fluorescent region 140 and the substrate 120, between the substrate 120 and the light diffusion region 130, and between the light diffusion region 130 and the driving member 110 by using high-refractive-index glue.

In an alternative embodiment, as shown in fig. 3, the receiving block 105 may be used for fixing, that is, the receiving block 105 is disposed at the connection between the substrate 120 and the light scattering area 130. Specifically, the receiving block 105 is disposed on the same side of the substrate 120 and the light dispersion area 130 close to the driver 110, and the receiving block 105 is located at a connection position of the substrate 120 and the light dispersion area 130 while having an overlapping portion with the substrate 120 and the light dispersion area 130, thereby fixedly connecting the substrate 120 and the light dispersion area 130.

When the base plate 120 and the light dispersion region 130 are fixedly connected by means of the receiving block 105, it is preferable that the receiving block 105 is made of a material having characteristics corresponding to those of the light dispersion region 130.

Since the wavelengths of the red laser beam and the green laser beam are different from each other, the half angle of divergence of the light scattering area for the red laser beam needs to be smaller than that of the light scattering area for the green laser beam in order to obtain the same scattering effect.

Further, referring to fig. 4 and 5, the light scattering area 130 may include a first light scattering area 132 and a second light scattering area 134 having different half angles of divergence, and the two first light scattering areas 132 and the two second light scattering areas 134 having different half angles of divergence may make the spot-scattering effects of the red laser light and the green laser light consistent.

Alternatively, the first light-radiating region 132 may be circular, and the second light-radiating region 134 may be a circular ring structure. When the light scattering area 130 is located at the inner circle position of the fluorescent area 140, the first light scattering area 132 is fixedly connected with the driving member 110, the second light scattering area 134 is annularly arranged on the periphery of the first light scattering area 132, and the second light scattering area 134 and the first light scattering area 132 are spliced to form the light scattering area 130. The red laser is scattered by the light scattering area with the smaller divergence half angle, and the green laser is scattered by the light scattering area with the larger divergence half angle.

When the light diffusion region 130 includes the first light diffusion region 132 and the second light diffusion region 134, the connection positions between the first light diffusion region 132 and the second light diffusion region 134, and between the second light diffusion region 134 and the substrate 120 may be high-strength bonded by using a high-refractive-index glue or fixedly connected by using a receiving block.

As shown in fig. 6, the connection positions between the first light-scattering area 132 and the second light-scattering area 134, and the connection positions between the second light-scattering area 134 and the substrate 120 can be fixed by using the receiving block 105, and the fixing manner is as described above, which is not described herein again.

It can be understood that the positions and the width dimensions of the first light scattering area 132 and the second light scattering area 134 can be adjusted according to the positions of the inner and outer circles where the red laser light and the green laser light are located, and the application does not limit the size of the divergence half angle corresponding to the first light scattering area 132 and the second light scattering area 134, as long as it is ensured that the red laser light corresponds to the light scattering area with the smaller divergence half angle, and the green laser light corresponds to the light scattering area with the larger divergence half angle.

In another embodiment, referring to fig. 7 and 8, the first light-scattering area 132 and the second light-scattering area 134 may be both fan-shaped structures, and the first light-scattering area 132 and the second light-scattering area 134 can be spliced into a circle. As above, the light scattering area with a smaller half angle of divergence scatters the red laser, and the light scattering area with a larger half angle of divergence scatters the green laser.

It is understood that the fan angle of the first light scattering area 132 may be the same as or different from the fan angle of the second light scattering area 134, or the first light scattering area 132 and the second light scattering area 134 may have a substantially fan-shaped structure, in other words, the light scattering area 130 may be formed by splicing two light scattering areas having different shape angles and different half angles of divergence, and the positions and the shapes and the sizes of the first light scattering area 132 and the second light scattering area 134 may be adjusted according to the turn-on time of the red laser light and the green laser light, which is not limited in this application.

Through the structure that forms for two kinds of astigmatic regional concatenations that the half angle is different are dispersed to the design of light scattering area 130, can realize that the facula of red laser is broken up the effect and is broken up the effect unanimous with the facula of green laser, and then makes the red laser and the green laser of actual replenishment possess the same face and distribute when synthesizing white light jointly with fluorescence, improves the homogeneity of white light.

Further, referring to fig. 9, the wavelength conversion device 100 may further include a color filter ring 150. The color filter ring 150 is used to filter the emitted fluorescent light beams to meet the color gamut requirement.

Referring to fig. 9 and fig. 10, alternatively, the color filter ring 150 may have a ring-shaped structure, the color filter ring 150 may be sleeved on the outer side of the substrate 120, and the color filter ring 150 and the side of the substrate 120 may be fixed by gluing.

As shown in fig. 11, in an alternative embodiment, a receiving block 105 may also be disposed at a connection position of the color filter ring 150 and the substrate 120, and the receiving block 105 is located at a side of the color filter ring 150 and the substrate 120 close to the driving component 110.

The color filter rings 150 are radially offset from the phosphor zones 140 along the driver 110, so that the wavelength conversion device 100 has a phosphor zone, an astigmatism zone, and a filter zone. The excitation light source is emitted to the phosphor in the phosphor area 140, so that the phosphor is excited to generate a fluorescent light beam, and the fluorescent light beam can be guided by the optical guiding element to the color filter ring 150, pass through the filter area, and be emitted.

It should be noted that, if the excitation light is emitted onto the fluorescence area 140, and the fluorescence beam generated by exciting the fluorescence area 140 can meet the requirement of the color gamut without color correction, the wavelength conversion device 100 may remove the laser color ring and leave the fluorescence area and the light scattering area, that is, the wavelength conversion device 100 may not include the filter color ring 150, so as to save the production cost. However, when the color gamut requirement is not satisfied on the premise that the color is not required to be modified, the entire structure of the wavelength conversion device 100 includes the laser color ring, and the fluorescent light beam generated by exciting the fluorescent region 140 needs to be filtered by the laser color ring, and the filtered fluorescent light beam is emitted from the color wheel, so as to satisfy the color gamut requirement.

Alternatively, the color filter wheel 150 may include, but is not limited to, red, green and blue filter regions at various angles. When the color filter is mounted, the fluorescent area 140 and the color filter ring 150 can be adhered to the side surface of the substrate 120 by glue, the fluorescent area 140 is located on the upper surface of the substrate 120, and the color filter ring 150 is sleeved on the outer side of the substrate 120.

It can be understood that the relative positions of the fluorescent area 140, the light-scattering area 130 and the color filter ring 150 can be adjusted according to the optical path requirement, including but not limited to the light-scattering area 130 being located inside the substrate 120, the color filter ring 150 being located outside the substrate 120, the fluorescent area 140 and the color filter ring 150 can be composed of a plurality of areas with different colors according to the requirement, and the light-scattering area 130 can also be formed by splicing light-scattering areas with different half-angles according to the actual requirement. The embodiment of the application does not limit the corresponding position, size, color segment and the like, and can be adjusted according to actual requirements.

Alternatively, in another embodiment, the substrate 120 can be used as a carrier and is fixedly connected to the driver 110, the light scattering area 130 and the fluorescent area 140.

Referring to fig. 12 and 13, the substrate 120 may include a first surface and a second surface that are opposite to each other, a specific region of the first surface of the substrate 120 is coated with phosphor to form a phosphor region 140, the driving member 110 is fixedly connected to the second surface of the substrate 120, and the light-scattering region 130 is fixedly connected to a side of the substrate 120 that is opposite to the driving member 110.

Specifically, the first surface of the substrate 120 is convexly provided with the connecting portion 122, the connecting portion 122 may be a cylindrical structure, the light scattering area 130 is fixed to an end surface of the connecting portion 122, and the light scattering area 130 and the fluorescent area 140 are staggered in a radial direction along the driver 110. Since the color filter ring 150 is fixedly connected to the outer side of the substrate 120, the light-scattering region 130, the light-emitting region 140, and the color filter ring 150 are staggered in the radial direction of the driver 110. When the wavelength conversion device 100 with the structure is applied to a projection system, it is convenient to provide an optical guiding element, so that the first excitation light source emits to the fluorescent area 140, and emits a fluorescent light beam through the first optical guiding element, the second excitation light source emits to the light scattering area 130, and emits a scattered light beam through the second optical guiding element, and the emitted fluorescent light beam and the emitted scattered light beam have the same emitting direction, which is beneficial to the later-period light combination.

Alternatively, the light scattering region 130 and the light emitting region 140 may be located on different sides of the substrate 120, in addition to being located on the same side of the substrate 120. When the light scattering region 130 and the light scattering region 140 are located on different sides of the substrate 120, it is advantageous to reduce the size of the device in the axial or radial direction of the driver 110, thereby reducing the overall volume of the device.

Referring to fig. 14, the substrate 120 is a circular plate-shaped structure, a fluorescent region 140 is obtained by coating phosphor on a specific region of the first surface of the substrate 120, the driving member 110 is adhered to the second surface of the substrate 120, and the driving member 110 is located at the center of the substrate 120. The light scattering area 130 is a circular ring structure, and the light scattering area 130 is adhered to the second surface of the substrate 120 and sleeved outside the driving member 110.

In this configuration, the phosphor zones 140 and the astigmatism zones 130 are offset along the axis of the driver 110 and do not intersect or overlap each other. The filter color ring 150 and the fluorescent region 140, and the filter color ring 150 and the light scattering region 130 are offset in the radial direction of the driver 110, and the relative positions of the fluorescent region 140 and the light scattering region 130 in the radial direction of the driver 110 are not limited, which is beneficial to reducing the volume of the wavelength conversion device 100 on the premise of meeting the use requirement.

Alternatively, as shown in fig. 15, the fluorescent area 140 and the light scattering area 130 may be respectively located at two sides of the substrate 120, and the light scattering area 130 is a circular ring structure and is fixed on the outer peripheral wall of the driving member 110 by using glue.

In another alternative embodiment, the light dispersion zone 130 is obliquely disposed between the driver 110 and the substrate 120.

Referring to fig. 16, the second surface of the substrate 120 or the sidewall of the driver 110 is provided with a conical portion 125, the conical portion 125 is disposed around the outer peripheral wall of the driver 110, the conical portion 125 includes a conical surface having an included angle of 45 ° with the central axis of the driver 110, and the light diffusion region 130 is attached to the conical surface. By arranging the conical part 125, and forming an included angle of 45 ° between the conical surface and the central axis of the driving element 110, on one hand, the exit direction of the scattered light beam after being scattered by the light scattering area 130 of the excitation light beam incident on the light scattering area 130 can be ensured to be consistent with the exit direction of the fluorescent light beam, which is beneficial to subsequent light combination. In addition, since the conical portion 125 is annularly disposed on the outer peripheral wall of the driver 110 and the second surface of the substrate 120 or the sidewall of the driver 110, the structural stability of the connection between the driver 110 and the substrate 120 can be further enhanced.

Alternatively, in another alternative embodiment, as shown in fig. 17, the light diffusion area 130 is adhered to the outer sidewall of the filter color ring 150, the longitudinal section of the light diffusion area 130 may be triangular, the light diffusion area 130 includes an inclined side surface, and the angle between the inclined side surface and the central axis of the driver 110 may be 45 °. Compared with the conventional structure by adding the scattering wheel, the wavelength conversion device 100 provided by the embodiment of the present application only needs one driving member 110 and wheel body, and has a simple structure and a compact optical path. Meanwhile, since the light scattering area 130 is disposed outside the substrate 120, the light scattering area 130 is convenient to detach and replace, and an operator can change the position, the roughness, the slope angle and other parameters of the light scattering area 130 according to different requirements of the supplement light, so as to adjust the speckle eliminating degree and the transmission direction of the supplement light, and the wavelength conversion device 100 provided by the embodiment of the application can adapt to different application scenes.

It can be understood that the relative positions of the phosphor zones 140, the color filter rings 150 and the light diffusion zones 130 in the above embodiments can be adjusted according to the requirement of the light path, and are not limited to the same plane, and the selectivity of the relative positions is large. Meanwhile, the light scattering area 130 may also be designed to be formed by splicing two light scattering areas with different divergence half angles according to requirements, which is not limited in the present application.

The wavelength conversion device 100 provided in the embodiment of the present application can integrate the reflective color wheel and the light-scattering color wheel, and can perform a better speckle-scattering effect on the three primary colors of laser light while outputting the three primary colors of light in a time-sequential manner, thereby improving the quality of a projected image; the wavelength conversion device 100 which combines the fluorescent area 140, the filtering color ring 150 and the light scattering area 130 into a whole is favorable for reducing independent speckle dispersing components, simplifying an optical structure and reducing production cost, so that the integral volume of a compression optical machine is favorable for realizing miniaturization of a product, and the color gamut range of a light source can be enlarged due to the arrangement of different color correction areas; through designing the structure that the half angle concatenation formed for dispersing by the difference with light scattering area 130, can satisfy the facula of red laser and green laser and break up the demand that the effect is the same, further improve the optical expansion maintenance rate of laser, improve laser transmission efficiency. The wavelength conversion device 100 can be applied to color wheels such as micro-projection and laser televisions with higher requirements on the volume and the color gamut of a light source, can effectively reduce the volume of the light source, improves the color gamut range of the light source, and is beneficial to improving the competitiveness of products.

The embodiment of the present application further provides a projection system 200, which includes a light source and the wavelength conversion device 100 described above.

Referring to fig. 18, 19 and 20 together, there are shown schematic structural diagrams of various structures of a projection system 200 according to an embodiment of the present disclosure.

Specifically, the light source may include a first light source 201, a second light source 203, and a third light source 205 for emitting excitation light. The wavelength conversion device 100 is disposed in a transmission optical path of the light source, and the phosphor disposed in the phosphor area 140 can be sequentially excited to generate a phosphor beam under the irradiation of the first light source 201, and the light scattering area 130 can emit a scattering beam under the irradiation of the second light source 203 and the third light source 205. In the wavelength conversion device 100 provided in the embodiment of the present application, the fluorescence area 140 is a reflective structure, and the fluorescence area 140 is excited to generate a fluorescence beam and is reflected.

Further, the projection system 200 provided by the embodiment of the present application may further include a first optical guiding element.

Since the wavelength of the blue laser light is short, the blue laser light is used as the first light source 201, thereby exciting the fluorescent region in the wavelength conversion device 100. The second light source 203 may be a green laser light source, the third light source 205 may be a red laser light source, and the excitation light emitted from the green laser light source and the red laser light source may be incident on the light diffusion region in the wavelength conversion device 100.

The first optical guiding element may be disposed in a transmission optical path of the first light source 201, and guides the fluorescent light beam reflected by the fluorescent region 140 to exit.

Specifically, referring to fig. 18, the first optical guiding element may include an area diaphragm 210, a first lens 212, a second lens 214 and a first reflector 216.

Alternatively, the area diaphragm 210 may include a reflective area and a transmissive area in the middle. The transmission area can transmit the excitation light beam, and the reflection area can reflect the fluorescence light beam generated by exciting the fluorescent powder coated on the fluorescence area. The first lens 212 and the second lens 214 may both be collecting lenses, and the first mirror 216 may be a total reflection mirror.

The emitted light beam of the first light source 201 sequentially passes through the transmission region of the regional diaphragm 210, the first lens 212, and the second lens 214 and then reaches the fluorescent region 140 in the wavelength conversion device 100, the fluorescent powder disposed in the fluorescent region 140 can be sequentially excited under the irradiation of the first light source 201 to generate a fluorescent light beam, the fluorescent light beam sequentially passes through the second lens 214 and the first lens 212 to be collimated and then enters the reflection region of the regional diaphragm 210, is reflected to the first reflector 216 by the reflection region of the regional diaphragm 210, is reflected by the first reflector 216 and then exits to the color filter ring 150, and finally, the fluorescent light beam is emitted after being filtered by the color filter ring 150.

The light-emitting principle of the projection system 200 provided by the embodiment of the application is as follows:

when the blue laser emitted from the first light source 201 passes through the blue light penetration region of the area film 210, the blue laser sequentially enters the first lens 212 and the second lens 214, and reaches the fluorescent region in the wavelength conversion device 100 after being converged by the collecting lens group, so that the fluorescent powder is excited on the fluorescent region 140 to generate a fluorescent light beam. The fluorescent light beam is scattered in lambertian light form, then collimated by the second lens 214 and the first lens 212 to reach the surface of the area diaphragm 210, reflected by the area diaphragm 210 to reach the surface of the first reflector 216, reflected by the first reflector 216 to reach the filter area in the wavelength conversion device 100, and finally emitted from the color wheel after being filtered by the filter color ring 150.

Meanwhile, the wavelength conversion device 100 is integrally rotated in synchronization by the rotation of the driving member 110, so that the fluorescent light beams can be sequentially output in time series. The excitation light beams emitted from the second light source 203 and the third light source 205 are emitted to the light scattering region 130 in the wavelength conversion device 100, and then emitted from the wavelength conversion device 100 after the light spots are scattered by the light scattering region 130.

It is understood that in the prior art, the complementary light and the fluorescent light are usually processed by combining and then homogenizing. However, in this manner, since the etendue of the laser light and the fluorescence is different, in order to ensure the dodging effect on the etendue of the fluorescence, the etendue of the supplementary light is generally sacrificed, resulting in a large loss of the supplementary light.

The projection system 200 provided in the embodiment of the present application performs light uniformization on the fluorescent light and the complementary light respectively through different light uniformizing devices, and then performs light combination through the light combining device to generate the illumination light beam. Because the optical expansion amounts of the laser and the fluorescence are different, the laser and the fluorescence can be respectively homogenized by adopting different light homogenizing devices, so that the light utilization rate of the supplementary laser is improved, and the production cost of the whole machine is reduced.

It should be noted that, in order to achieve the same scattering effect of the second light source 203 and the third light source 205, the light scattering areas 130 formed by splicing the light scattering areas with different half angles of divergence are needed. And the first and second light diffusion regions 132 and 134 of the light diffusion region 130 are disposed at positions corresponding to the second and third light sources 203 and 205. Namely: the second light source 203 is a green laser light source, the third light source 205 is a red laser light source, the first light scattering area 132 corresponds to the second light source 203, and when the second light scattering area 134 corresponds to the third light source 205, the divergence half-angle of the first light scattering area 132 is larger than that of the second light scattering area 134. The light spot scattering effect of the second light source 203 and the light spot scattering effect of the third light source 205 can be the same through the light scattering areas 130 with two different divergence half angles.

In fig. 18, the first light source 201, the second light source 203, and the third light source 205 have the same incident direction and the same emission direction. In fig. 19 and 20, the reflecting surface of the light scattering area 130 is inclined, and the inclined angle is 45 ° to the axial direction of the driving member 110. The incidence directions of the second light source 203 and the third light source 205 are the same, and have an angle of 90 ° with the incidence direction of the first light source 201. The second light source 203 and the third light source 205 are incident on the reflection surface of the light diffusion region 130, and the emergent direction after scattered and reflected by the light diffusion region 130 is the same as that of the first light source 201, so that the structure is compact.

Alternatively, in fig. 19, a dichroic plate may be provided in the direction of intersection with the fluorescent light beam, and the interference effect of the supplementary optical element with the driver 110 may be reduced by providing the dichroic plate. Alternatively, the emission direction of the fluorescent light beam and the emission direction of the supplementary light may be set apart in the 3D space to reduce color crosstalk.

It is understood that the filter color wheel 150 may not be included in the wavelength conversion device 100 if the fluorescent light beam excited by the fluorescent region 140 can satisfy the color gamut requirement without color correction. The light beam emitted from the first light source 201 is guided by the first optical guiding element and then directly emitted without being filtered by the color filter ring 150, which can also meet the requirement of color gamut. Meanwhile, the structure is simple, and the production cost is saved.

Further, referring to fig. 21, fig. 22, and fig. 23, the projection system 200 provided in the embodiment of the present application may further include a second optical guiding element. The second optical guiding element is disposed in the transmission optical path of the second light source 203 and the third light source 205, and guides the scattered light beam out.

Specifically, as shown in fig. 21, the second optical guiding element may include a third lens 220 and a second mirror 222. Wherein the third lens 220 may be a collecting lens. The light beams emitted from the second light source 203 and the third light source 205 are converged by the third lens 220, reach the light diffusion region 130 in the wavelength conversion device 100, are diffused by the light diffusion region 130, are collimated by the third lens 220, reach the second reflecting mirror 222, and are reflected by the second reflecting mirror 222 to emit a diffused light beam.

When the structure of the wavelength conversion device 100 is shown in fig. 15, the light-scattering region 130 is disposed around the outer peripheral wall of the driving member 110. The incident directions of the second light source 203 and the third light source 205 are the same and perpendicular to the incident direction of the first light source 201. The laser light emitted by the second light source 203 and the third light source 205 is focused by the third lens 220 to reach the light scattering area 130, and is scattered by the light scattering area 130, so that the scattered laser light is collimated by the third lens 220 again and is reflected by the second reflecting mirror 222, and the emitting direction is the same as the emitting direction of the first light source 201.

Further, as shown in fig. 22, the second optical element may further include a third mirror 224. Wherein the third mirror 224 corresponds to the second mirror 222 for changing the direction of the light beam.

When the wavelength conversion device 100 has the structure shown in fig. 11, that is, the light scattering region 130 is disposed on the second surface of the substrate 120, the incident directions of the second light source 203 and the third light source 205 are the same and opposite to the incident direction of the first light source 201. The laser light emitted by the second light source 203 and the third light source 205 is focused by the third lens 220 to reach the light scattering area 130, and is scattered by the light scattering area 130, so that the scattered laser light is collected by the third lens 220 again and then is reflected by the second reflector 222 and the third reflector 224 in sequence, and the emitting direction is the same as the emitting direction of the first light source 201.

Alternatively, as shown in fig. 20, the second optical guiding element may include a second mirror 222 and a third mirror 224. The second mirror 222 and the third mirror 224 may be disposed in the transmission optical path of the second light source 203 and the third light source 205 in sequence.

When the wavelength conversion device 100 has the structure shown in fig. 9, that is, the light-scattering region 130 is connected to the connecting portion 122 convexly disposed on the first surface of the substrate 120, the incident directions of the second light source 203, the third light source 205 and the first light source 201 are the same. The laser beams emitted by the second light source 203 and the third light source 205 pass through the light scattering area 130, and are scattered by the light spot of the light scattering area 130, so that the scattered laser beams are reflected by the second reflector 222 and the third reflector 224 in sequence, and then the emitted light beams are deflected, and the emitting direction is the same as that of the first light source 201.

The wavelength conversion device 100 and the projection system 200 provided by the embodiment of the application can save separate speckle-dissipating components by integrating the fluorescence area 140 and the astigmatism area 130, reduce the production cost, reduce the size of the optical machine, and are beneficial to realizing the miniaturization of products. So that the wavelength conversion device 100 can output three primary colors of light in a time sequence, and simultaneously can perform a better speckle elimination effect on three primary colors of laser light, thereby improving the quality of a projected image.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (13)

1. A wavelength conversion device, comprising:

a drive member;

a substrate;

the light scattering area or the substrate is fixedly connected with the driving piece, and the light scattering area is used for eliminating speckles of the supplementary light beams and emitting scattered light beams; and

the fluorescent area is located the base plate deviates from one side of driving piece, it has phosphor powder to coat on the fluorescent area to make the fluorescent area produces fluorescence light beam under excitation of excitation light beam.

2. The wavelength conversion device of claim 1, wherein the substrate includes an inner side surface, the light scattering region includes an outer side surface and a lower surface, the lower surface of the light scattering region is fixedly connected to the driving member, and the outer side surface of the light scattering region is fixedly connected to the inner side surface of the substrate.

3. The wavelength conversion device according to claim 2, wherein the light-scattering region includes a first light-scattering region and a second light-scattering region different in divergence half angle;

the first light scattering area is fixedly connected with the driving piece, and the second light scattering area is arranged on the periphery of the first light scattering area in a surrounding mode and is located on the inner side of the substrate; or, the first light scattering area and the second light scattering area are both of fan-shaped structures, and the first light scattering area and the second light scattering area are spliced into a circle.

4. The wavelength conversion device of claim 1, wherein the substrate includes a first surface and a second surface facing away from each other, the phosphor region is located on the first surface, the driving member is fixed on the second surface, and the light-scattering region is fixedly connected to the substrate or the driving member.

5. The wavelength conversion device according to claim 4, wherein the first surface of the substrate is convexly provided with a connecting portion, the light-scattering region is fixed with the connecting portion, and the light-scattering region and the fluorescent region are staggered in a radial direction of the driving member.

6. The wavelength conversion device of claim 4, wherein the light-scattering region is fixed to a peripheral sidewall of the driving member or the second surface of the substrate.

7. The wavelength conversion device according to claim 4, wherein the second surface of the substrate or the side wall of the driving member is provided with a conical portion, the conical portion includes a conical surface having an included angle with the central axis of the driving member, and the light diffusion region is attached to the conical surface.

8. The wavelength conversion device according to any one of claims 1 to 7, further comprising a filtering color ring, wherein the filtering color ring is fixedly connected to an outer side surface of the substrate, and the filtering color ring is offset from the fluorescent region in a radial direction of the driving member, and the filtering color ring is configured to filter the fluorescent light beam emitted thereto;

the fluorescent light beam generated by exciting the fluorescent powder in the fluorescent area can be guided to the filtering color ring by an optical guide element and is emitted after color correction and filtering of the filtering color ring.

9. The wavelength conversion device of claim 8, wherein the light scattering area is adhered to an outer sidewall of the filter color ring, and the light scattering area comprises an inclined side surface, and the inclined side surface forms an included angle with a central axis of the driving member to change a transmission direction of the supplementary light beam emitted to the light scattering area after the supplementary light beam emits the scattered light beam after the spot is dissipated.

10. A projection system comprising a light source and a wavelength conversion device as claimed in any one of claims 1 to 9.

11. The projection system of claim 10, wherein the light source includes a first light source, a second light source, and a third light source for emitting an excitation light, the wavelength conversion device is disposed in a transmission light path of the light source, the phosphor coated on the phosphor area is sequentially excited under the irradiation of the first light source to generate a phosphor beam, and the light scattering area eliminates speckles of the second light source and the third light source incident thereon and emits a scattered light beam.

12. The projection system of claim 11, further comprising a first optical guiding element disposed in a transmission optical path of the first light source and guiding a fluorescent light beam generated by exciting the phosphor of the fluorescent region to exit.

13. The projection system of claim 11, further comprising a second optical guiding element disposed in a transmission optical path of the second light source and the third light source, and guiding and emitting a scattered light beam emitted after being despecked by the light scattering area.

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