CN105867057A - Light source system, wavelength conversion device and related projection system - Google Patents

Abstract

The embodiment of the invention discloses a light source system, a wavelength conversion device and a related projection system. The light source system comprises an excitation light source and a wavelength conversion device, wherein the excitation light source is used for generating an excitation light; the excitation light enters the wavelength conversion device; the wavelength conversion device comprises a microstructure array; the microstructure array comprises a plurality of microstructure bodies which are in a projection form; each microstructure body comprises a wavelength conversion material; the distance between any two adjacent microstructure bodies is greater than zero; scattering surfaces coat the microstructure bodies; the undulating surface of the microstructure array faces the incident excitation light; and a light spot, of the excitation light, formed on the wavelength conversion device covers at least one part of one microstructure body and also covers at least one part of the scattering surface between the microstructure body and one adjacent microstructure body, so that the excitation light is scattered through the scattering surface, mixed with excited light and emitted. The light source system which is efficient and emits hybrid light of the excitation light and the excited light can be provided.

Description

Light source system, wavelength conversion device and related projection system

The present invention is based on the division of the patent application with the application number 201210395090.X, the title of the invention is light source system, wavelength conversion device and related projection system, and the application date is October 17, 2012.

technical field

The invention relates to the technical field of illumination and display, in particular to a light source system, a wavelength conversion device and a related projection system.

Background technique

In the light-emitting device of the lighting system or the projection system in the prior art, the excitation light is often used to excite the wavelength conversion material to generate the stimulated light. However, since the wavelength conversion efficiency of each wavelength conversion material particle cannot be 100% in the process of being excited, the energy lost therein is converted into heat, which results in the accumulation of heat of the wavelength conversion material particle and the temperature The rapid rise of the wavelength directly affects the luminous efficiency and service life of the wavelength conversion material.

A commonly used solution is to drive the wavelength conversion material to move through the driving device, so that the light spot formed by the excitation light on the wavelength conversion material acts on the wavelength conversion material according to a predetermined path. In this way, the wavelength conversion material per unit area is not always under the irradiation of excitation light, so as to reduce the heat accumulation of the wavelength conversion material per unit area.

However, as the illumination system and the projection system have higher and higher requirements on the optical power of the outgoing light, the optical power of the excitation light also increases accordingly. When the optical power density of the excitation light is higher, the photoconversion efficiency of the wavelength conversion material is lower; decline.

Contents of the invention

The technical problem mainly solved by the present invention is to provide an efficient light source system that emits mixed light of excitation light and received light.

An embodiment of the present invention provides a light source system, including an excitation light source for generating excitation light and a wavelength conversion device, the excitation light is incident on the wavelength conversion device, and the wavelength conversion device includes:

Microstructure array, including a plurality of microstructures, each microstructure is columnar, conical, pyramidal, truncated, pyramidal, prism-shaped, or protruding on the surface of other curved surfaces, wherein each microstructure Including a wavelength conversion material, the distance between any two adjacent microstructures is greater than zero, and a scattering surface is covered between each microstructure;

The microstructure array has an undulating side facing the incident excitation light, and the light spot formed by the excitation light on the wavelength conversion device covers at least part of a microstructure, so that the wavelength conversion material in the microstructure Excited to generate the subject light, the light spot also covers at least part of the scattering surface between the microstructure and an adjacent microstructure, so that the excitation light is scattered by the scattering surface and mixed with the subject light shoot.

An embodiment of the present invention also provides a wavelength conversion device, including:

Microstructure array, including a plurality of microstructures, each microstructure is columnar, conical, pyramidal, truncated, pyramidal, prism-shaped, or protruding on the surface of other curved surfaces, wherein each microstructure Including the wavelength conversion material, the distance between any two adjacent microstructures is greater than zero, and a scattering surface is covered between each microstructure.

An embodiment of the present invention also provides a projection system, including the above-mentioned light source system.

Compared with the prior art, the present invention includes the following beneficial effects:

In the present invention, the wavelength conversion material is arranged as a plurality of microstructures, and each microstructure is in the shape of a cone, a pyramid, a truncated cone, a truncated pyramid, a column, or a convex shape with other curved surfaces, and the microstructure array has The undulating side faces the excitation light, so that in a direction parallel to the extension of the microstructure array, the surface area of the wavelength conversion material receiving the excitation light in a unit plane area increases, compared to a whole and the surface is a planar wavelength In the conversion layer, the optical power density received by the wavelength conversion material in the wavelength conversion device in the present invention decreases, thereby improving the light conversion efficiency; at the same time, since the distance between any two adjacent microstructures is greater than zero, and each microstructure Scattering surfaces are covered between the structures, so that part of the excitation light is not used for excitation, but is scattered by the scattering surfaces and synthesized with the received light generated by the wavelength conversion material to form light of another color.

Description of drawings

FIG. 1A is a schematic structural view of an embodiment of the light source system of the present invention;

Fig. 1B is a schematic structural diagram of a wavelength conversion device in the light source system shown in Fig. 1A;

Fig. 1C is a perspective view of a wavelength conversion device in another embodiment of the light source system of the present invention;

1D is a side view of the wavelength conversion device in another embodiment of the light source system of the present invention;

FIG. 2A is a schematic diagram of an embodiment of an optical path structure in the light source system shown in FIG. 1A;

Fig. 2B is a schematic diagram of another embodiment of the light path structure in the light source system shown in Fig. 1A;

Fig. 3 is a structural schematic diagram of another embodiment of the light source system of the present invention;

Fig. 4 is a schematic structural diagram of another embodiment of the light source system of the present invention.

detailed description

Embodiments of the present invention will be described in detail below with reference to the drawings and implementation methods.

Embodiment one

Please refer to FIG. 1A . FIG. 1A is a schematic structural diagram of an embodiment of the light source system of the present invention. The light source system 100 includes an excitation light source 101 and a wavelength conversion device 11 .

The wavelength conversion device 11 includes a microstructure array 103 . The microstructure array includes a plurality of microstructures 103a, wherein each microstructure 103a includes a wavelength conversion material for absorbing light in one wavelength range and emitting light in another wavelength range. Commonly used wavelength converting materials include phosphors. The wavelength conversion material may also be materials with wavelength conversion capabilities such as quantum dots and fluorescent dyes, and is not limited to phosphors. As shown in FIG. 1B , FIG. 1B is a schematic structural diagram of the wavelength conversion device in the light source system shown in FIG. 1A . In this embodiment, each microstructure 103a is in the shape of a triangular pyramid and arranged in a square array. The distance between any two adjacent microstructures is greater than zero, and a scattering surface 107 is provided between each microstructure. The microstructure array 103 has an undulating side facing the excitation light source 101 .

The excitation light source 101 is used to generate excitation light L1 to excite the wavelength conversion material in the wavelength conversion device 103 to generate the stimulated light. Commonly used excitation light sources include LED light sources, laser light sources or other solid-state light sources.

The light spot formed by the excitation light L1 on the wavelength conversion device 11 covers at least part of a microstructure 103a, so as to excite the wavelength conversion material in the microstructure to generate the subject light; the light spot also covers the microstructure and adjacent At least part of the scattering surface 107 between one of the microstructures, so that the excitation light is directly scattered by the scattering surface 107 without being absorbed by the wavelength conversion material. Part of the scattered excitation light is incident on the microstructure to excite the wavelength conversion material in the microstructure, and the rest of the excitation light is not used for excitation but is directly mixed with the received light and emitted, so that the wavelength conversion device emits A mixture of stimulated and unabsorbed excitation light. Since the exciting light is scattered by the scattering surface 107 and then mixed with the receiving light, the two kinds of light are mixed more uniformly.

The wavelength conversion device 11 also includes a substrate 105 including opposing first and second surfaces 105a, 105b. The microstructure array 103 is disposed on the first surface 105a. Correspondingly, the scattering surface 107 between the microstructures in the microstructure array 103 can be realized by roughening the surface of the substrate 105 corresponding to the area between the microstructures, or by roughening the surface of the substrate 105 corresponding to each microstructure This is achieved by setting scattering materials or other scattering structures on the surface of the intermediate region.

The base can be made of some heat-conducting materials, such as aluminum, so as to reduce the working temperature of the microstructure array 103 and further increase the working life of the wavelength conversion device 11 . In this embodiment, the wavelength conversion material is arranged as a plurality of microstructures, and each microstructure is in the shape of a triangular pyramid, so that within a direction parallel to the extension of the microstructure array, the wavelength conversion of the received excitation light in a unit plane area The surface area of the material is increased. Compared with an integral wavelength conversion layer with a flat surface, the optical power density received by the wavelength conversion material in the wavelength conversion device in the present invention decreases, thereby improving the light conversion efficiency.

In this embodiment, each microstructure 103a may also be in the shape of a pyramid in other shapes, such as a quadrangular pyramid. Alternatively, each microstructure 103a can also be columnar, conical, truncated, truncated, prismatic, or protruding with other curved surfaces, or a combination of the above different microstructures. The shapes of these enumerated microstructures can increase the surface area of the wavelength conversion material receiving excitation light in a unit plane area along the extension direction parallel to the microstructure array, thereby improving the light conversion efficiency of the wavelength conversion material.

Please refer to FIG. 1C , which is a perspective view of the wavelength conversion device in another embodiment of the light source system of the present invention. As shown in Figure 1C, the difference between this embodiment and the embodiment shown in Figure 1 is that each microstructure 12 in the microstructure array in this embodiment is in the shape of a triangular prism, and each triangular prism is parallel to each other. extend in the same direction.

Please refer to FIG. 1D . FIG. 1D is a side view of the wavelength converting device in another embodiment of the light source system of the present invention. As shown in Figure 1D, the difference between this embodiment and the embodiment shown in Figure 1 is that in this embodiment, each microstructure 13 in the microstructure array is in the shape of a square column, that is, each microstructure 13 is parallel to The cross-section along the extending direction of the microstructure array is square. Different from microstructures in other shapes, in the microstructure array including columnar microstructures, the surface area of the wavelength conversion material receiving the excitation light is increased mainly through the side surfaces of the columns. Since in practical application, the excitation light cannot be completely collimated and incident on the wavelength conversion device vertically, part of the excitation light is incident on the side of the columnar microstructure for excitation.

In order to understand how the light source system of the present invention works, specific examples are given below. As shown in FIG. 2A , FIG. 2A is a schematic diagram of an embodiment of the light path structure in the light source system shown in FIG. 1A . In this embodiment, an excitation light source (not shown in the figure) is used to generate blue excitation light L1. The microstructure array 103 in the wavelength conversion device 11 includes a yellow phosphor for absorbing blue light and generating yellow light L2. The wavelength conversion device 11 is reflective, that is, the optical paths of the exciting light L1 and the receiving light L2 are located on the same side of the wavelength conversion device 11 , which can reduce light loss. Correspondingly, a reflective layer can be disposed on the first surface 105 a of the substrate 105 . Since the fluorescent powder emits full-angle light, the yellow stimulated light L2 emitted toward the excitation light source is directly emitted, and the emitted light L2 emitted toward the substrate 105 is reflected by the reflective layer on the first surface 105a and then emitted toward the excitation light source. The blue excitation light L1 scattered by the scattering surface 107 and reflected by the reflective layer on the first surface 105a also exits toward the excitation light source, and is mixed with the yellow excitation light to form white light.

In order to improve the utilization rate of the wavelength conversion material in the microstructure, preferably, the substrate 105 is made of a light-transmitting material, and the reflective surface is disposed on the second surface 105 b of the substrate 105 . In this way, the excitation light not absorbed by the microstructure array and part of the excitation light transmitted by the scattering surface 107 enters the substrate 105 and is reflected back to the microstructure array 103 by the second surface 105b. Part of the excitation light reflected back to the microstructure array 103 is scattered by the scattering surface 107 and transmitted, and the other part is reflected to the bottom surface of the microstructure array 103, that is, the side where the microstructure array 103 is in contact with the first surface 105a of the substrate 105, And excite the bottom surface of the microstructure 103 to generate the stimulated light.

Of course, in practical applications, the wavelength conversion device 11 may also be a transmission type. As shown in FIG. 2B , FIG. 2B is a schematic diagram of another embodiment of the light path structure in the light source system shown in FIG. 1A . In this embodiment, the base 105 is made of a transparent material, such as glass. The yellow stimulated light L2 generated by the yellow phosphor in the microstructure array 103 is transmitted through the substrate 105 and emerges from the second surface 105 b of the substrate 105 . Part of the excitation light is scattered by the scattering surface 107 and then transmits through the substrate 105 and emerges from the second surface 105b of the substrate 105, and is mixed with the yellow stimulated light L2 to form white light. In this embodiment, due to the full-angle light emission of the phosphor, part of the yellow received light is emitted from the side of the wavelength conversion device 11 facing the excitation light source, causing part of the light to be lost without being collected. Therefore, a filter can be placed on the optical path where the excitation light L1 is incident on the wavelength conversion device 11 , for transmitting the excitation light and reflecting the received light, so as to increase the collection rate of the light beam. Of course, in occasions where the requirement for brightness is not very high, the filter may not be used.

Embodiment two

Please refer to FIG. 3 . FIG. 3 is a schematic structural diagram of another embodiment of the light source system of the present invention. In this embodiment, the light source system 300 includes an excitation light source 301 and a wavelength conversion device 33 . The wavelength conversion device 33 includes a microstructure array 303 and a substrate 305 . Different from Embodiment 1, the base 305 in this embodiment is made of light-transmitting material, and the microstructure array 303 is disposed in the base 305 .

The substrate 305 includes a first surface 305 a and a second surface 305 b opposite to the first surface 305 a, wherein the first surface 305 a is used for receiving the excitation light L1 from the excitation light source 301 . The microstructure array 303 has an undulating side facing the first surface 305a, and the extending direction of the microstructure array 303 is parallel to the first surface 305a.

Compared with Embodiment 1, the contact area between each microstructure body 303 a in the microstructure array 303 and the substrate 305 in this embodiment is larger, which is more conducive to the heat dissipation of the microstructure array 303 .

In this embodiment, the wavelength conversion device 33 may be a transmissive type or a reflective type, and the optical path structures of the two are similar to those in the transmissive and reflective wavelength conversion devices described in Embodiment 1. The optical path structure, the same parts will not be repeated here. However, compared with the transmission wavelength conversion device described in Embodiment 1, in this embodiment, a filter film may be coated on the first surface 305a for transmitting the excitation light and reflecting the received light, so as to improve the collection rate of the light beam. Further, the filter film can also be set to reflect the excitation light incident at a large angle, so that the part of the excitation light reflected by the microstructure array 303 that exits from the first surface 305a of the substrate 305 at a large angle is filtered by the filter film. The light film is reflected back to the microstructure array 303 again, so as to improve the utilization rate of the excitation light.

In this embodiment, the scattering surface 307 between the microstructures 303a in the microstructure array 303 can be realized by disposing scattering materials or scattering structures between the microstructures. For example, this can be achieved by roughening the surface of the second surface 305b of the substrate 305 corresponding to the regions between the microstructures.

Embodiment Three

Please refer to FIG. 4 . FIG. 4 is a schematic structural diagram of another embodiment of the light source system of the present invention. The light source system 400 includes an excitation light source (not shown) and a wavelength conversion device 44 . The wavelength conversion device 44 includes a wavelength conversion layer 403 . Different from the above embodiments, the microstructure array in the wavelength conversion device 44 in this embodiment is not arranged on the substrate or in the substrate, but is directly formed on the side of the wavelength conversion layer 403 facing the excitation light source as in the embodiment. 1 and 2 describe microstructure arrays. Compared with the above embodiments, in this embodiment, since no substrate is needed to carry the wavelength conversion layer, the cost can be reduced.

In this embodiment, the wavelength conversion device 44 is reflective, and each microstructure is columnar. This can be achieved by coating a reflective film on the other side of the wavelength conversion layer 403 facing away from the excitation light source. Of course, the wavelength converting device 44 can also be arranged on a reflective mirror to realize a reflective structure.

Correspondingly, the scattering surface 407 is set as a scattering reflection surface, which can be realized by coating a reflective film between the microstructures first and then providing a scattering material or a scattering structure. Of course, if the scattering is realized by placing scattering materials between the microstructures, since the scattering materials have a partial reflection effect on the light beam, when the thickness of the scattering materials is large enough, the effect of scattering reflection can also be realized, that is, there is no need to first A reflective film is plated between each microstructure body, and a scattering material is directly arranged. Of course, in practical applications, if the required amount of excitation light is small, since the scattering material has a partial reflection effect on the beam, the scattering material does not need to reflect the thickness of the entire beam, as long as part of the beam is reflected. . The excitation light transmitted through the scattering material excites the wavelength conversion material and the unabsorbed excitation light will be reflected by the reflective film on the other side of the wavelength conversion layer 403 facing away from the excitation light source, and from the wavelength conversion The layer exits towards the side of the excitation light source. The structure of the optical path in this embodiment is similar to the structure of the optical path in the reflective wavelength conversion device in the above embodiments, and will not be repeated here.

In order to increase the surface area of each microstructure on the microstructure array for receiving excitation light, preferably, the average height of each microstructure is greater than half of the average distance between any two adjacent microstructures.

In the above embodiments, the proportions of the excitation light and the received light used to synthesize the mixed outgoing light are different, which will result in different color coordinates of the synthesized mixed outgoing light. When the concentration of the wavelength conversion material in the microstructure array in the wavelength conversion device is constant, the ratio of the excitation light and the received light in the outgoing mixed light is determined by the density of each microstructure covered by the light spot formed by the excitation light on the wavelength conversion device. The ratio of the surface area to the surface area of the covered scattering surface; it is easy to understand that when the microstructure is sufficiently small, this ratio is approximately the ratio of the surface area of each microstructure in the microstructure array to the surface area of the scattering surface. Since the ratio of the excitation light component in the mixed outgoing light is determined by the ratio of the surface area of the scattering surface to the total area of the microstructure array, the ratio of the laser component is determined by the ratio of the surface area of each microstructure to the total area of the microstructure array; therefore, The ratio of the excitation light to the received light can be determined according to the color coordinates of the required mixed outgoing light, and then the ratio of the surface area of each microstructure in the microstructure array to the surface area of the scattering surface can be determined, so that the final light source system emits the mixed light. The color coordinates reach the previously required color coordinates.

In the above embodiments, both the excitation light source and the wavelength conversion device are relatively static. In practical applications, the driving device can also be used to drive the wavelength conversion device to move, so that the spot formed by the excitation light on the wavelength conversion device moves along a predetermined path. In this way, the heat dissipation capability of the wavelength conversion device can be further improved. For example, a motor can be used to drive the wavelength conversion device to rotate, so that the light spot formed by the excitation light on the wavelength conversion device periodically acts on the microstructure array along a circular path.

Further, the light source system may also include a control device, and the microstructure array includes at least two different regions, wherein the ratio of the surface area of each microstructure on the two regions to the surface area of the scattering surface is different, and the different ratios in different regions Corresponding to predetermined color coordinates of different mixed outgoing lights. When the color coordinate of the mixed outgoing light needs to be changed, the control device sends a control signal to the drive device, wherein the control signal includes a drive mode. The drive device acquires the control signal, and drives the wavelength conversion device according to the driving mode included in the control signal, so that the moving path of the light spot formed by the excitation light on the wavelength conversion device is changed to a predetermined area, so that the wavelength conversion The device emits mixed light conforming to a predetermined color coordinate value.

Specifically, for example, in this embodiment, the driving device is used to drive the wavelength conversion device to rotate periodically. Correspondingly, the microstructures in the microstructure array can be arranged parallel and side by side in multiple rings. In different rings, the spacing between the microstructures is different, that is, the area of the scattering surface is different. In this embodiment, the distance between the microstructures in the outermost ring is the largest. Along the radial direction, the spacing between the microstructures in different rings gradually decreases, that is, the smaller the area of the scattering surface in the inner ring, the smaller the proportion of the excitation light to the outgoing mixed light. The larger the ratio of the received light to the outgoing mixed light is. When changing the color coordinates of the outgoing mixed light, if it is necessary to increase the ratio of the excitation light to the outgoing mixed light, the control device sends a control signal to the drive device, so that the drive device drives the wavelength conversion device to move, so as to change the excitation light in micro The position of the light spot formed on the structure array makes it move toward the outer ring along the direction away from the center of the circle of the microstructure array in the radial direction. If it is necessary to increase the ratio of the received light to the outgoing mixed light, the control device sends a control signal to the drive device, so that the drive device drives the wavelength conversion device to move, so that the position of the light spot moves inward toward the center of the microstructure array along the radial direction The ring moves.

The above description is just an example of different ratios of the surface area of the microstructures in the microstructure array to the surface area of the scattering surface on different regions of the wavelength conversion device, and is not limited thereto. In practical application, the spacing between the microstructures in the outermost ring can also be the smallest; and along the radial direction, the spacing between the microstructures in different rings gradually increases, that is The larger the area of the scattering surface in the inner ring, the greater the proportion of the excitation light to the outgoing mixed light, and the smaller the proportion of the stimulated light to the outgoing mixed light.

Alternatively, the microstructures in the microstructure array are distributed in a square array, wherein the microstructures are uniformly distributed in each row in the square array, that is, the surface areas of the microstructures are consistent and the scattering surfaces between the microstructures are equal to each other. The surface area is consistent; the ratio of the surface area of each microstructure in different rows to the surface area of the scattering surface is different. For example, along the direction perpendicular to each row, the ratio of the surface area of each microstructure in different rows to the surface area of the scattering surface decreases gradually. Correspondingly, the driving device is a linear translation device, so that the light spots respectively act on a certain row in the microstructure array along a linear path. When the color coordinate of the emitted mixed light needs to be changed, the control device controls the drive device to change the row where the light spot formed by the excitation light on the wavelength conversion device is located. Of course, in this embodiment, the microstructures in the same row of the square microstructure array can also be unevenly distributed, as long as the light spot formed by the excitation light on the wavelength conversion device moves in one row of the mixed outgoing light. It is sufficient that the average color coordinates are different from the average color coordinates of the mixed outgoing light generated when the other rows are moved.

In order to change the color coordinates of the mixed outgoing light more precisely, the light source system may further include a detection device for detecting the color coordinates of the mixed outgoing light and feeding back the detected color coordinates to the user or the control device. If the feedback is given to the user, the user can manually control the control device to control the driving device according to the difference between the detected color coordinate and the predetermined color coordinate, so that the spot formed by the excitation light on the wavelength conversion device moves to a predetermined position. If it is fed back to the control device, the control device can predetermine the predetermined color coordinates, and calculate the difference between the detected color coordinates and the predetermined color coordinates. When the difference exceeds a predetermined threshold, the control device sends a control signal to the drive device, and the drive device The wavelength conversion device is driven to move according to the control signal, so that the light spot formed by the excitation light on the wavelength conversion device moves to a position where the detected color coordinate coincides with the predetermined color coordinate.

Specifically, for example, in this embodiment, the blue excitation light and the yellow excitation light are mixed to form white light to be emitted. Since the color coordinates and color temperature of white light can be converted to each other, for the convenience of calculation, the detection device is used to detect the color temperature of white light. The control device presets the amplitude of each movement of the wavelength conversion device. In this embodiment, the amplitude is the amplitude D0 of the radial translation of the wavelength conversion layer, and the preset color temperature of white light is S1, and the predetermined threshold is S0.

The detection device detects the light signal of the white light emitted by the wavelength conversion device, and obtains the color temperature of the white light, which is recorded as S2. The detection device feeds back the color temperature to the control device. The control device first judges the difference between the predetermined color temperature S1 and the actual color temperature S2. If the difference between S1 and S2 is less than S0, the control device has no action. If the difference between S1 and S2 is greater than or equal to S0, the control device determines the magnitude of S1 and S2. If S1 is greater than S2, the control device sends a control signal to the drive device, so that the drive device drives the wavelength conversion device to translate once in the direction of increasing the color temperature S2, and the translation range is the preset range D0. If S1 is smaller than S2, the control device sends a control signal to the drive device, so that the drive device drives the wavelength conversion device to translate once in the direction of reducing the color temperature S2, and the translation range is the preset range D0. After the wavelength conversion device is shifted, the detection device detects the light signal again, and obtains the new color temperature of the white light, which is recorded as S3. The detection device feeds back the color temperature to the control device. The control device first judges the difference between the predetermined color temperature S1 and the actual color temperature S3. In this way, until the difference between the actual color temperature and the predetermined color temperature S1 is less than the predetermined threshold value S0, the control device stops the drive device from driving the wavelength conversion device. In this way, the adjustment of the color temperature of white light is automated and more precise.

Additionally, the control device may also preset a mapping table. The mapping table contains different ranges of the difference between the actual color temperature and the predetermined color temperature, and the driving modes corresponding to the different ranges of the differences, and the driving mode includes the amplitude and direction of driving the movement of the wavelength conversion device. When the detection device sends the detected actual color temperature to the control device, the control device first determines whether the difference between the actual color temperature and the predetermined color temperature exceeds a predetermined threshold. If the difference does not exceed the predetermined threshold, the control means does not act. When the difference exceeds the predetermined threshold, the control device acquires the driving mode corresponding to the difference from the mapping table and generates a control signal, and sends the control signal to the driving device, the control signal includes the driving mode, that is, drives the wavelength conversion device direction and magnitude of movement. The driving device drives the wavelength conversion device according to the driving mode in the control signal, so that the wavelength conversion device moves according to a predetermined amplitude and direction.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

An embodiment of the present invention also provides a projection system, including a light source system, and the light source system may have the structures and functions in the above-mentioned embodiments. The projection system may adopt various projection technologies, such as liquid crystal display (LCD, Liquid Crystal Display) projection technology, digital light path processor (DLP, Digital Light Processor) projection technology. In addition, the above-mentioned light-emitting device can also be applied to lighting systems, such as stage lighting.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (7)

1. A light source system, comprising an excitation light source and a wavelength conversion device, is characterized in that: The excitation light source is used to generate blue excitation light; The wavelength conversion device includes a reflective layer, a substrate and a wavelength conversion material arranged in sequence; The wavelength conversion device is provided with a side of the wavelength conversion material facing the excitation light, and the wavelength conversion material is arranged on the optical path of the excitation light; The base is made of a light-transmitting material, and the excitation light that is incident on the wavelength conversion material and not absorbed by the wavelength conversion material transmits through the base and is reflected back to the wavelength conversion material by the reflective layer. 2. The light source system according to claim 1, wherein the substrate comprises a first surface and a second surface, a reflective layer is arranged on the side where the second surface is located, and a wavelength conversion material is arranged on the first surface side, wherein, The first surface is at least partially made into a scattering surface by surface roughening. 3. The light source system according to claim 1, wherein the base comprises a first surface and a second surface, a reflective layer is arranged on the side where the second surface is located, and the first surface and the second surface Oppositely, a scattering layer made of a scattering material or a scattering structure is arranged between the first surface and the wavelength conversion material. 4. The light source system according to any one of claims 1 to 3, wherein the wavelength conversion material is yellow phosphor. 5. The light source system according to claim 1, wherein the wavelength converting material is made into a microstructure array, and the distance between any two adjacent microstructures is greater than zero. 6. The light source system according to claim 5, wherein a scattering surface is provided between any two adjacent microstructures for scattering excitation light and/or light emitted by the wavelength conversion material. 7. A projection system, characterized by comprising the light source system according to any one of claims 1-6.