CN113885285A

CN113885285A - Light source assembly and projection equipment

Info

Publication number: CN113885285A
Application number: CN202111138946.0A
Authority: CN
Inventors: 李巍; 田有良; 刘显荣
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-04
Anticipated expiration: 2041-09-27
Also published as: CN113885285B

Abstract

The application provides a light source subassembly and projection equipment, the light source subassembly includes laser generation unit, closes light mirror, adjusts luminance the unit. The laser generating unit is used for generating a plurality of beams of laser, and an interval is formed between two adjacent beams of laser; the light combining mirror is arranged on one side of the laser generating unit and comprises a plurality of light combining reflecting regions and a plurality of transmission regions which are alternately arranged, and each transmission region correspondingly allows a blue light beam in one laser beam to pass through; the dimming unit is arranged on one side of the light combining mirror, which is away from the laser generating unit, and comprises a first lens group and a fluorescent wheel; the first lens group is used for converging the plurality of blue light beams onto the fluorescent wheel; the fluorescent wheel comprises a reflection area, the reflection area comprises a reflection part and a light modulation part, the reflection part is used for reflecting blue light beams, the light modulation part is excited by the blue light beams to generate light of a first color, the light is modulated with the reflected blue light, and the light is reflected to the light combination reflection area to form a light source.

Description

Light source assembly and projection equipment

Technical Field

The application relates to the technical field of projection, in particular to a light source assembly and projection equipment.

Background

Currently, projection devices are widely used in various application scenarios such as home, business, education, and advertisement. The projection equipment is internally provided with a light source component for generating a light source, the light source component is used for generating tricolor light (red light, green light and blue light), the blue light accepted by human eyes is 474nm, and in the existing light source component, monochromatic 455nm blue light is generally adopted as an excitation light source, the wavelength is purple light, so that the color of a projection image is poor, and the blue light is purple.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

An object of the present application is to improve the color display effect of a projected image.

In order to solve the technical problem, the following technical scheme is adopted in the application:

according to one aspect of the present application, there is provided a light source assembly comprising:

the laser generating unit is used for generating a plurality of beams of laser, and an interval is formed between every two adjacent beams of laser;

the light combining mirror is arranged on one side of the laser generating unit and comprises a plurality of light combining reflecting regions and a plurality of transmission regions which are alternately arranged, and each transmission region correspondingly allows a blue light beam in a laser beam to pass through;

the dimming unit is arranged on one side of the light-combining mirror, which is far away from the laser generating unit, and comprises a first lens group and a fluorescent wheel; the first lens group is used for converging a plurality of blue light beams onto the fluorescent wheel; the fluorescent wheel comprises a reflection area, the reflection area comprises a reflection part and a light modulation part, the reflection part is used for reflecting the blue light beam, the light modulation part is excited by the blue light beam to generate light of a first color, the light is modulated with the reflected blue light, and the light is reflected to the light combination reflection area to form a light source.

According to an embodiment of the present application, the fluorescent wheel includes a circular substrate, the substrate further includes at least one light conversion region thereon, and the reflection region and the at least one light conversion region are sequentially arranged on the substrate along a circumferential direction of the substrate;

the light adjusting part is arranged on one side surface of the substrate facing the light combination mirror, and the reflecting part is at least partially overlapped on the light adjusting part.

According to an embodiment of the present application, the reflection portion includes a reflection film, and a light reflectivity of the reflection film is greater than a first value, so that a mixed light power ratio of the reflected blue light and the light of the first color is greater than 3: 1.

wherein the light adjusting portion is provided on the substrate in parallel with the reflecting portion, and extends in a circumferential direction of the substrate.

According to an embodiment of the present application, the light source assembly includes a driving mechanism for driving the first lens group to move between the light combining mirror and the fluorescent wheel to adjust the size and position of the light spot formed on the fluorescent wheel, so as to adjust the area of the light spot covering the light adjusting part and the reflecting part.

According to an embodiment of the application, the light adjusting part includes a pink fluorescent conversion material, and the pink fluorescent conversion material generates pink light after being excited by blue light irradiation.

According to an embodiment of the present application, the light combining mirror sequentially includes a first light combining reflection region, a first transmission region, a second light combining reflection region, and a second transmission region along a length direction thereof;

the first light combining reflection area and the second transmission area are correspondingly identical in shape and size and are symmetrical along the longitudinal axis of the light combining mirror; the second light combining reflection area and the first transmission area are correspondingly identical in shape and size and are symmetrical along the longitudinal axis of the light combining mirror.

According to an embodiment of the present application, the laser generating unit includes a laser and two reflecting mirrors, and the two reflecting mirrors are disposed between the laser and the light combining mirror; the laser is used for emitting laser, and the two reflector groups are respectively used for dividing the laser into two beams which are respectively reflected to the first transmission area and the second transmission area.

According to an embodiment of the application, the light source subassembly still includes second lens and light pipe, the second lens and the light pipe is located in proper order one side of closing the photoscope, the second lens be used for with it converges to close the light that the light reflection zone reflects to the entry of light pipe.

The application also provides projection equipment which comprises an optical machine, a lens and the light source component;

the light source assembly is used for converting monochromatic laser into tricolor light according to time sequence and inputting the tricolor light into the optical machine; the light machine modulates the time sequence tricolor light and outputs the color light to the lens; the lens collects and images modulated light input from the optical machine and projects the modulated light.

According to the scheme of the embodiment, the reflection part and the dimming part are arranged on the reflection area of the fluorescent wheel, the reflection part is used for reflecting the blue light beam, the dimming part is excited by the blue light beam to generate light with a first color so as to be tuned with the reflected blue light, the main wavelength change is realized, and therefore the purple light in the original mixed light color is tuned, and the display effect of the projection color is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic view of a light source assembly according to an example embodiment.

FIG. 2 is a schematic diagram illustrating a fluorescent wheel construction according to an example embodiment.

Fig. 3 is a side view of fig. 2.

FIG. 4 is a schematic diagram illustrating a fluorescent wheel according to another example embodiment.

Fig. 5 is a schematic view of a light source assembly according to another exemplary embodiment.

The reference numerals are explained below: 1. a laser generating unit; 11. a laser; 12. a reflector group; 121. a first plane mirror; 122. a second plane mirror; 123. a third planar mirror; 124. a fourth plane mirror.

2. A light combining mirror; 21. a first light-combining reflection area; 22. a first transmissive region; 23. a second light-combining reflection area; 24. a second transmissive region;

3. a dimming unit; 31. a first lens group; 32. a fluorescent wheel; 321. a substrate; 322. a reflective region; 3221. a reflection section; 3222. a light adjusting section; 323. a light conversion region;

41. a second lens group; 42. a lens array;

51. a second lens; 52. a light pipe; 53. and (5) a color filter wheel.

Detailed Description

While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.

Thus, a feature indicated in this specification is intended to describe one of the features of an embodiment of the application and does not imply that every embodiment of the application must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various elements of the present application not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

The preferred embodiments of the present application will be further described in detail below with reference to the accompanying drawings of the present specification.

The application provides a light source component and projection equipment, wherein the projection equipment comprises an optical machine, a lens and the light source component; the light source component is used for converting the monochromatic laser into three primary colors according to time sequence and inputting the three primary colors into the optical machine; the optical machine modulates the sequential tricolor light and outputs the color light to the lens; the lens collects and images modulated light input from the optical machine and projects the modulated light.

Illustratively, the three primary colors include red, green, and blue. The light source assembly can generate primary color light sources required by projection display according to time sequence, and the primary color light sources are illuminated by the light machine and imaged by the lens, so that a color picture is finally synthesized on the display screen.

In the following embodiments, specific embodiments of the light source assembly will be described.

Referring to fig. 1, fig. 1 is a schematic view illustrating a light source assembly according to an exemplary embodiment. In one embodiment, the light source assembly includes a laser generating unit 1, a light combining mirror 2, and a light adjusting unit 3. The laser generating unit 1 is used for generating a plurality of laser beams; the light combining mirror 2 is arranged on one side of the laser generating unit 1, the light combining mirror 2 comprises a plurality of light combining reflecting regions and a plurality of transmission regions which are alternately arranged, and each transmission region correspondingly allows a blue light beam in a laser beam to pass through; the dimming unit 3 is arranged on one side of the light combining mirror 2, which is far away from the laser generating unit 1, and the dimming unit 3 comprises a first lens group 31 and a fluorescent wheel 32; the first lens group 31 is used for converging a plurality of blue light beams onto the fluorescent wheel 32; as shown in FIG. 2, the fluorescent wheel 32 includes a light conversion region 323 and a reflective region 322. The light conversion region 323 is provided with a fluorescence conversion material for converting fluorescence under irradiation of the excitation light. The reflection region 322 is used for harmonizing the blue laser incident thereon, and emits the blue laser toward the first lens group 31 after changing the wavelength range of the blue laser.

The light source assembly further includes a first lens group 31 disposed on the front surface of the fluorescent wheel 32 for converging the incident light beam so that the light beam is incident on the surface of the fluorescent wheel 32 as a converging spot.

Referring to fig. 1 for example, the laser beams are respectively emitted to a plurality of transmission regions in the light combining mirror 2, and each transmission region can transmit the emitted laser beams to the first lens group 31. Spots formed on the first lens group 31 by any two of the plurality of laser beams are asymmetric with respect to the optical axis h of the first lens group 31. Alternatively, the plurality of laser beams do not pass through the optical axis of the first lens group 31.

Illustratively, the plurality of lasers emitted by the laser 11 includes a first laser beam S1 and a second laser beam S1. The first laser beams S1 may be directed to the first transmissive areas 22, and to the first lens group 31 through the first transmissive areas 22, respectively; the second laser beam S2 is directed to the second transmissive area 24 and is directed to the first lens group 31 through the second transmissive area 24. The spot formed by the first laser beam S1 on the first lens group 31 and the spot formed by the second laser beam S1 on the first lens group 31 are asymmetrical with respect to the optical axis h of the first lens group 31. In other words, the position of the mirror irradiated with the first laser beam S1 on the first lens group 31 and the position of the mirror irradiated with the second laser beam S1 are asymmetrical with respect to the optical axis h of the first lens group 31. The first laser beam S1 is closer to the optical axis h than the second laser beam S2 as in fig. 1. Alternatively, there is no position symmetrical with respect to the optical axis h in the spot formed by the first laser beam S1 on the first lens group 31 and the spot formed by the second laser beam S1 on the first lens group 31.

The first lens group 31 may converge the incident laser light toward the fluorescent wheel 32. The fluorescent wheel 32 can rotate around the rotation axis Z, and during the rotation of the fluorescent wheel 32, different areas in the fluorescent wheel 32 are irradiated by the converged laser light (i.e., the laser light emitted from the first lens group 31). When the converged laser light is emitted to the light conversion region of the fluorescent wheel 32, the light conversion region is excited to emit fluorescent light having a color different from that of the incident laser light of the fluorescent wheel 32. The fluorescence light may be directed through the first lens group 31 towards the combiner 2, e.g. towards a reflective area in the combiner 2. When the converged laser light is emitted to the light reflection region in the fluorescent wheel 32, the light reflection portion disposed on the light reflection region can reflect the laser light, and the reflected laser light is emitted to the light combining mirror 2 through the first lens group 31 again, for example, to the reflection region of the light combining mirror 2. The reflecting region of the light combining mirror 2 can reflect the light emitted to the reflecting region by the first lens group 31; that is, the reflective region may reflect both the laser light and the fluorescence emitted to the reflective region by the first lens group 31 in a target direction, so as to realize the mixing of the laser light and the fluorescence.

In an example, as shown in fig. 1, the light source module further includes a second lens 51 disposed in a light path before the light guide 52, and the second lens 51 receives the light beam reflected by the light-receiving mirror 2, and the light beam is angularly compressed and then enters the light guide 52.

FIG. 2 is a schematic plane view of a fluorescent wheel according to an embodiment of the present disclosure. The fluorescent wheel 32 can rotate about the rotation axis so that the laser light (e.g., including the first laser beam and the second laser beam) converged from the first lens group 31 to the fluorescent wheel 32 is switched between the light conversion region 323 and the reflection region 322. Alternatively, the fluorescent wheel 32 may be annular in shape with a reflective substrate.

When the laser light is emitted to the light conversion region 323, the phosphor thereon may be excited to emit fluorescent light of a corresponding color, which is different from the color of the laser light, and the fluorescent light may be reflected by the reflective substrate toward the first lens group 31. Illustratively, at least a green fluorescent material may be disposed in the light conversion region of the fluorescent wheel 32. At least one of a red fluorescent material and a yellow fluorescent material may also be disposed in the light conversion region. The fluorescent light emitted from the light-converting region of the fluorescent wheel 32 may be green fluorescent light, red fluorescent light, or other color fluorescent light, such as yellow fluorescent light. Alternatively, the fluorescence may be a laser. The color of the fluorescence is different from the color of the laser light emitted by the laser 11, e.g., the laser 11 may emit blue laser light. Optionally, the color of the laser light emitted by the laser 11 may also be other colors, which is not limited in this embodiment.

When the laser light is emitted to the reflection area 322 of the fluorescent wheel 32, the reflection area 322 is used to perform band-pass modulation on the blue laser light incident thereon and then reflect the blue laser light, so that the light reflected by the reflection area 322 is a mixed light of the blue light and the fluorescent light.

Both the fluorescence emitted from the light conversion region 323 of the fluorescence wheel 32 and the mixed light of the laser light and the fluorescence emitted from the reflection region 322 of the fluorescence wheel 32 can be emitted to the first lens group 31 in a wide light emission angle range. Since the light conversion region and the light reflection region in the fluorescence wheel 32 both resemble lambertian bodies when emitting light and emit light toward the whole surface of the first lens group 31, the first lens group 31 can collimate the incident light so that the light is emitted in a whole beam similar to parallel light. Optionally, in the embodiment of the present application, the first lens group 31 is taken as an example, and optionally, the first lens group 31 may also be composed of a plurality of lenses, so as to improve the converging effect of the first lens group on light.

The light (for example, a mixed light of laser light and fluorescence or fluorescence) emitted from the first lens group 31 to the light combining mirror 2 is approximately parallel light, and can be emitted from the entire surface of the first lens group 31. The light directed to the light combiner 2 is directed not only to the reflection area in the light combiner 2 but also to the transmission area in the light combiner 2. The reflection area in the light combining mirror 2 can reflect the laser light and the fluorescence, and the embodiment of the present application is not limited as to whether the reflection area reflects light with a color different from that of the laser light and the fluorescence. For example, the reflective region may be a full spectrum highly reflective film, i.e., reflecting all colors of light. The light combining mirror 2 may have opposite first and second faces, the first face may face the laser 11, and the second face may face the first lens group 31. The first surface is also the light incident surface of the light combiner 2, and the second surface is also the light emitting surface of the light combiner 2. Alternatively, the light emitted from the first lens group 31 to the combiner 2 may be reflected at the second surface.

Alternatively, the transmissive region in the light combining mirror 2 may have dichroism. The transmissive region may transmit the blended blue light, i.e., the mixed light of the blue light and the fluorescent light, reflected by the reflective region 322 of the fluorescent wheel 32, and reflect the excited fluorescent light from the light-converting region 323 of the fluorescent wheel 32.

Alternatively, the transmissive region may reflect light of a color different from the laser color. Illustratively, the transmissive region may be configured to transmit blue light and reflect red and green light. The fluorescence excited by the light conversion region 323 of the fluorescence wheel 32 can be totally reflected after being emitted to the beam combiner 2, so as to be used for forming a projection picture subsequently, and the utilization rate of the fluorescence is ensured.

Alternatively, the transmission region in the light combiner 2 may also be transmissive for all light. And the area of the transmission region in the light combining mirror 2 can be smaller than that of the reflection region. For example, the total area of all the transmissive regions in the combiner 2 may be smaller than the total area of all the reflective regions, the area of each transmissive region may be smaller than the area of its neighboring reflective region, or may be smaller than the area of each reflective region. Alternatively, the area of each transmissive region may be less than or equal to 1/4 of the area of the reflective region adjacent to the transmissive region. Optionally, the areas of the transmission regions in the light combining mirror 2 are equal, and the areas of the reflection regions are also equal; or the areas of the transmission regions may be different, and the areas of the reflection regions may be different. The area of the transmission region in the light combining mirror 2 only needs to be sufficient to transmit the incident laser light.

Referring to the fluorescent wheel 32 including the reflective area 322, the reflective area 322 includes a reflective portion 3221 and a light adjusting portion 3222, the reflective portion 3221 is configured to reflect the blue light beam, and the light adjusting portion 3222 is excited by the blue light beam to generate light of the first color, so as to be adjusted with the reflected blue light, and both are reflected to the light combining reflective area to be reflected, so as to form the light source.

In the scheme of this embodiment, the reflection portion 3221 and the light-adjusting portion 3222 are disposed on the reflection region of the fluorescent wheel 32, the reflection portion 3221 is configured to reflect a blue light beam, and the light-adjusting portion 3222 is excited by the blue light beam to generate light of a first color, so as to be tuned with the reflected blue light, thereby realizing a dominant wavelength change of the blue light, and thus tuning light near a purple waveband in light in an original mixed light color, so as to obtain a purer and more visually acceptable blue light, and improve a display effect of projection colors.

Moreover, the light combining mirror 2 of the present application has a plurality of light combining reflective areas and a plurality of transmissive areas alternately arranged, wherein each transmissive area corresponds to a blue light beam in a laser beam to pass through, and the plurality of blue light beams passing through the plurality of transmissive areas can be irradiated onto the first lens group 31 without being symmetrical with respect to the optical axis of the first lens group 31, and finally irradiated onto the fluorescence wheel, so that the ratio of the light reflected by the reflective portion 3221 and the light excited by the light modulating portion 3222 meets the design requirement, and the light modulating effect is ensured.

In this embodiment, the laser generating unit 1 may include a laser 11, and the laser 11 is used to generate blue laser light (hereinafter referred to as blue light). The laser 11 may emit only one laser beam or may emit a plurality of laser beams, which are respectively S1 and S2 in fig. 1.

The laser generating unit 1 may further include a second lens group 41, where the second lens group 41 includes a convex lens and a concave lens to form a telescope system for beam reduction of the laser beam, and the laser beam enters the telescope system formed by the second lens group 41 as an approximately parallel beam and still exits as an approximately parallel beam, but the size of the laser spot is smaller than the size before entering, so as to achieve the beam reduction.

In some embodiments, as in the example of fig. 5, the laser generating unit 1 further comprises a mirror group 12, the mirror group 12 being disposed between the laser 11 and the light combining mirror 2. The number of mirror groups 12 may correspond to the number of laser beams. Here, the mirror group 12 may be used to reflect the laser beams S1 and S2, respectively. Or one laser beam may be reflected to form two laser beams. The reflector set 12 includes a first plane mirror 121, a second plane mirror 122, a third plane mirror 123, and a fourth plane mirror 124, wherein the first plane mirror 121, the second plane mirror 122 are used for reflecting S1, the third plane mirror 123, and the fourth plane mirror 124 are used for reflecting S2.

Can carry out the beam splitting to the laser that laser instrument 11 sent through setting up speculum group 12 to, through the design that sets up the position of speculum group 12, can adjust the interval behind the beam splitting laser, can adapt to the interval between the above-mentioned transmission region in closing light mirror 2, thereby improve light utilization efficiency, and can also form the light beam with the different optical axes of first battery of lens 31, thereby make first battery of lens 31 carry out refraction processing to the light beam smoothly.

Illustratively, the direction of the laser light emitted by the laser 11 is a first direction, and the direction perpendicular to the first direction is a second direction. Each mirror group 12 may include two mirrors disposed in parallel, and the two mirrors may be disposed at an angle of 45 ° with respect to the first direction, so that the laser light after two reflections still propagates along the first direction.

And, as illustrated in fig. 5, the laser generating unit 1 may further include a lens array 42, where the lens array 42 is disposed between the second lens group 41 and the light combining mirror 2, and is used for diffusing the light beam refracted by the second lens group 41 at an angle in a length and width direction. Generally, the optical axes of the second lens group 41, the lens array 42, and the first lens group 31 are collinear.

In other embodiments, the lens array 42 may also be a single-sided microlens array, or may be a double-sided fly-eye lens. The main principle of the single-sided micro-lens array is that laser beams pass through the single-sided micro-lens array, and the laser beams are split by the micro-lens array to divide laser spots into divergent beams of the beams with different angles.

In the above embodiment, the light combining mirror 2 is disposed obliquely and forms an included angle with the first direction. The light combining mirror 2 includes a light combining reflection region and a transmission region. The transmission area has a dichroic function, can be directly transmitted by blue light, and reflects light beams of other colors. The reflecting area can comprise a lens which can be used for reflection, and the lens can be coated with a total reflection mode to improve the light reflection efficiency.

In an embodiment, the light combining mirror 2 sequentially includes a first light combining reflection area 21, a first transmission area 22, a second light combining reflection area 23, and a second transmission area 24. The laser 11 is used for emitting laser light, and the two mirror groups 12 are respectively used for dividing the laser light into two beams, and respectively reflect the two beams to the first transmission region 22 and the second transmission region 24. With the above embodiment, two blue light beams formed by the blue light beam emitted from the laser 11 passing through the two mirror groups 12, the second lens group 41, and the lens array 42 respectively reach the first transmissive region 22 and the second transmissive region 24.

In order to further improve the light utilization efficiency, in an embodiment, the shape and size of the first light combining reflection area 21 and the second light transmitting area 24 are correspondingly the same, and are symmetrical along the longitudinal axis of the light combining mirror 2; the second light combining reflection area 23 has the same shape and size as the first transmission area 22, and is symmetrical along the longitudinal axis of the light combining mirror 2. The light beam S1 is transmitted from the first transmission region 22 to the first lens group 31, refracted by the first lens group 31, and reflected by the fluorescent wheel 32, and most of the light beam can be emitted to the second light combining reflection region 23, so that the loss of light beams passing through the first transmission region 22 and the second light combining reflection region 23 is reduced. Similarly, the light beam S2 is transmitted from the second transmission region 24 to the first lens group 31, refracted by the first lens group 31, and reflected by the fluorescent wheel 32, and then the majority of the light beam can be emitted to the first light combination reflection region 21. By such an arrangement, the loss of light passing through the second transmissive region 24 and the first light-combining reflective region 21 is reduced.

In this embodiment, the light combining mirror 2 may be a whole lens, and the first light combining reflection area 21, the first transmission area 22, the second light combining reflection area 23, and the second transmission area 24 are formed by plating corresponding film layers on different areas. In other embodiments, the light combining mirror 2 may also be formed by splicing four small lens pieces, so that the length of the light combining mirror 2, the projection area, and the number of light combining areas can be flexibly configured.

In one embodiment, the first lens group 31 includes two convex lenses for converging the blue light transmitted from the light combiner 2. Based on the foregoing example, after entering the first lens group 31, the light beams S1 and S2 are refracted at angles β and α, respectively, and finally converge to form a light spot, which is projected onto the fluorescent wheel 32.

In order to solve the problem that the color of the projected image is poor and the blue light is purple due to using monochromatic 455nm blue light as an excitation light source in the conventional light source assembly, in the present embodiment, the fluorescent wheel 32 includes a reflection area, the reflection area includes a reflection portion 3221 and a light adjusting portion 3222, the reflection portion 3221 is configured to reflect a blue light beam, and the light adjusting portion 3222 is excited by the blue light beam to generate light of a first color, so as to be tuned with the reflected blue light beam, improve the main peak wavelength of the blue light, and all of the light is reflected to the light combining reflection area and is reflected by the light combining reflection area to form a light source.

The first color can be set according to the wavelength of the color to be mixed out finally. In one embodiment, the first color is a fluorescent color. The phosphor powder is excited and then mixed with blue light to realize the change of dominant wavelength, thereby blending the light close to the purple waveband range in the light in the original mixed light color to improve the display effect of the projection color.

Based on the operation of the light source assembly, the blue light blending process will be described with reference to the specific structure of the fluorescent wheel 32.

Referring to fig. 2 and 3, fig. 2 is a schematic diagram of a fluorescent wheel 32 according to an exemplary embodiment. Fig. 3 is a side view of fig. 2. In one embodiment, the fluorescent wheel 32 includes a circular base 321, and further includes at least one light conversion region 323, the reflective region 322 and the at least one light conversion region 323 are sequentially arranged on the base 321 along a circumferential direction of the base 321; the light adjusting portion 3222 is disposed on a surface of the substrate 321 facing the light combiner 2, and the reflecting portion 3221 is at least partially overlapped on the light adjusting portion 3222.

Specifically, the fluorescent wheel 32 is a three-primary-color fluorescent wheel, and there are two light conversion regions 323, wherein one light conversion region 323 has a red fluorescent material therein, and the red fluorescent material can emit red light under excitation of blue laser; one of the light conversion regions 323 includes a green phosphor material capable of emitting green light under excitation of blue laser light. In addition, blue light emitted to the reflective region 322 can form red, yellow and blue light. In the working process of the projection device, the fluorescent color wheel rotates at a high speed, so that once the fluorescent wheel 32 rotates for one period, the wavelength of the light source is converted twice completely to form red light and green light, and therefore, three primary colors of red, yellow and blue can be generated once the fluorescent wheel 32 rotates for one period.

In the present embodiment, the light adjusting portion 3222 is located below the reflection portion 3221 along the incident direction of the laser light, so when the blue light is emitted to the reflection region 322, part of the blue light is reflected by the reflection portion 3221, and part of the blue light is emitted to the light adjusting portion 3222 (phosphor material) through the reflection portion 3221, so that the phosphor color is excited.

Further, the ratio of blue light transmitted through the blue reflective region 322 is controlled to achieve the effect of the mixed light ratio of blue light and pink fluorescence. Here, the blue light reflecting portion 3221 may include a reflective film, a dichroic film, or a film material having light splitting such as a polarizing film. In an embodiment, the reflection portion 3221 includes a reflection film, and a light reflectivity of the reflection film is greater than a first value, so that a mixed light power ratio of the reflected blue light to the light of the first color is greater than 3: 1. The phenomenon of blue light color cast can be corrected better to mix the light proportion setting in this embodiment.

Therefore, in the present embodiment, the reflective portion 3221 and the light adjusting portion 3222 are configured, so that the light mixing ratio of the blue light and the first color can be conveniently adjusted by increasing or decreasing the types and the number of the diaphragms of the blue reflective portion 3221, thereby conveniently adjusting the light color after light mixing.

Referring to fig. 4, fig. 4 is a schematic diagram of a fluorescent wheel 32 according to another exemplary embodiment. In another embodiment, the fluorescent wheel 32 includes a circular base plate 321, and further includes at least one light conversion region 323, the reflective region 322 and the at least one light conversion region 323 are sequentially arranged on the base plate 321 along a circumferential direction of the base plate 321; the light adjusting portion 3222 is disposed on the substrate 321 in parallel with the reflecting portion 3221, and extends along the circumferential direction of the substrate 321; the first lens group 31 refracts the blue light beam to form a light spot on the fluorescent wheel 32, and the light spot can at least partially cover the light adjusting portion 3222 and partially cover the reflecting portion 3221 when the fluorescent wheel 32 rotates.

In this embodiment, the light adjusting portion 3222 is disposed on the substrate 321 in parallel with the reflection portion 3221, so that blue light is directly emitted to the light adjusting portion 3222, thereby exciting light of the first color. Here, since the edge of the substrate 321 is arc-shaped, the light adjusting portion 3222 and the reflecting portion 3221 each have an arc shape with respect to the center of the substrate 321. The light is converged by the first lens group 31 to form a light spot, and the light spot can periodically irradiate the light adjusting portion 3222 and the light reflecting portion along with the rotation of the fluorescent color wheel.

Further, in an embodiment, the light source assembly includes a driving mechanism for driving the first lens group 31 to move between the light combining mirror 2 and the fluorescent wheel 32 to adjust the size and the position of the light spot, so as to adjust the area of the light spot covering the light adjusting portion 3222 and the reflecting portion 3221.

The drive mechanism may comprise a drive motor. When the driving motor drives the first lens group 31 to move along the first direction, the size of the light spot irradiated on the fluorescent wheel 32 can be adjusted, and when the driving motor drives the first lens group 31 to move along the second direction, the distance of the light spot relative to the center of the base plate 321 can be adjusted. Therefore, according to the embodiment, the areas of the light spot covering the light adjusting portion 3222 and the reflecting portion 3221 can be adjusted, so that the light mixing ratio of the blue light and the first color can be adjusted, and the light color after light mixing can be adjusted.

In this embodiment, the blue light is directly emitted to the dimming portion 3222 and the reflecting portion 3221, so that the light loss is reduced, and the light utilization rate is improved. In addition, in the embodiment, when the mixed light color needs to be adjusted again, the position of the first lens group 31 only needs to be adjusted without adjusting the reflection portion 3221 and the light adjusting portion 3222, so that convenience in adjusting the mixed light color is improved.

Further, in an embodiment, the light source assembly further includes a second lens 51 and a light guide pipe 52, the second lens 51 and the light guide pipe 52 are sequentially disposed on one side of the light combining mirror 2, and the second lens 51 is used for converging the light reflected by the light combining and reflecting area 322 to an inlet of the light guide pipe 52. And further enters the optical machine through the light guide light outlet.

In an embodiment, a color filter wheel 53 is further disposed between the second lens 51 and the light pipe 52 for filtering the light beam, so as to improve the optical purity of the light beam and improve the color display effect.

The light propagation path is explained herein in its entirety. First, light beams S1 and S2 emitted from the laser 11 are reflected by the two mirror groups 12 and projected onto the second lens group 41, the light beam processed by the second lens group 41 is a circular light beam, the light beam is incident on the lens array 42, the lens array 42 diffuses the blue laser beam, so as to diverge the blue laser beam at a certain length and width angle, the diverged light beam is incident on the first transmission region 22 and the second transmission region 24 of the light combining mirror 2, and passes through the first transmission region 22 and the second transmission region 24 to be incident on the first lens group 31, and the blue light processed by the first lens group 31 is incident on the fluorescence wheel 32. During the rotation of the fluorescent wheel 32, the blue light hits the blue light reflection region 322, part of the blue light is reflected by the blue light reflection portion 3221, and part of the blue light is emitted to the light modulation portion 3222, and is reflected after the first color light is excited; the reflected blue light and the first color reflected by the reflection region (including the first light combination reflection region 21 and the second light combination reflection region 23) on the light combination mirror 2 are reflected, and then incident on the second lens 51, and the second lens 51 converges the light. The converged light enters the light guide 52 through the entrance port of the light guide 52 and finally enters the optical engine.

While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A light source assembly, comprising:

2. The light source assembly of claim 1, wherein the fluorescent wheel comprises a circular substrate, the substrate further comprising at least one light-converting region thereon, the reflective region and the at least one light-converting region being sequentially arranged on the substrate along a circumferential direction of the substrate;

3. The light source assembly according to claim 2, wherein the reflecting part includes a reflecting film having a light reflectivity greater than a first value so that a mixed light power ratio of the reflected blue light to the light of the first color is greater than 3: 1.

4. The light source assembly of claim 1, wherein the fluorescent wheel comprises a circular substrate, the substrate further comprising at least one light-converting region thereon, the reflective region and the at least one light-converting region being sequentially arranged on the substrate along a circumferential direction of the substrate;

5. The light source assembly according to claim 4, comprising a driving mechanism for driving the first lens group to move between the light combiner and the fluorescent wheel to adjust the size and position of the light spot formed on the fluorescent wheel, thereby adjusting the area of the light spot covering the light adjusting part and the reflecting part.

6. The light source assembly according to claim 1, wherein the dimming portion comprises a pink phosphor conversion material that generates pink light when excited by blue light illumination.

7. The light source component of claim 1, wherein the light combining mirror comprises a first light combining reflection region, a first transmission region, a second light combining reflection region, and a second transmission region in sequence along a length direction of the light combining mirror;

8. The light source assembly according to claim 7, wherein the laser generating unit comprises a laser and two mirror groups disposed between the laser and the light combining mirror; the laser is used for emitting laser, and the two reflector groups are respectively used for dividing the laser into two beams which are respectively reflected to the first transmission area and the second transmission area.

9. The light source module according to claim 1, further comprising a second lens and a light guide, wherein the second lens and the light guide are sequentially disposed on one side of the light combining mirror, and the second lens is configured to converge the light reflected by the light combining reflective area to an inlet of the light guide.

10. A projection apparatus, comprising an optical engine, a lens and a light source module according to any one of claims 1 to 9;