WO2022048325A1

WO2022048325A1 - Light source system and projection equipment

Info

Publication number: WO2022048325A1
Application number: PCT/CN2021/106507
Authority: WO
Inventors: 陈怡学; 尹蕾
Original assignee: 成都极米科技股份有限公司
Priority date: 2020-09-05
Filing date: 2021-07-15
Publication date: 2022-03-10
Also published as: CN114153117B; CN114153117A

Abstract

A light source system, comprising a first light source (1) for generating a light of a first wavelength; a first light splitting element (2) for transmitting and/or reflecting the light of a first wavelength that is incident thereto, and splitting the light of a first wavelength into a first excitation light and a second excitation light; a first wavelength conversion device (3) for converting the first excitation light into a light of a second wavelength and guiding the light of a second wavelength to a projection direction; and a second wavelength conversion device (4) for converting the second excitation light into a light of a third wavelength and guiding the light of a third wavelength to the projection direction. The first light splitting element (2) reflects the light of a second wavelength and transmits the light of a third wavelength. Further disclosed is projection equipment comprising the light source system. The light source system only uses one excitation light source to simultaneously improve both the light effect and brightness of two colors of light, without weakening the excitation intensity and excitation efficiency of a single light fluorescent powder layer, and the light source system is simple and compact in structure and low in cost.

Description

A light source system and projection equipment

technical field

The present invention relates to the field of display technology, and in particular, to a light source system and a projection device.

Background technique

In projection display products, the projection display light source is a very important component. Its function is to convert light of different colors, different angular distributions, different brightness and different shapes into uniform light spots that illuminate the effective area of the display chip.

In the field of projection display, traditional light bulbs have been less and less used due to their own defects, while new light sources such as LEDs, laser phosphors and tri-color lasers show excellent characteristics in terms of brightness, color, life, and energy consumption. , and gradually become the mainstream of the light source for projection display. Among the three new light source technologies, the LED light source is difficult to achieve high brightness, while the three-laser light source suffers from speckle and cannot obtain ideal image quality.

SUMMARY OF THE INVENTION

In traditional light sources, the luminous efficiency of red light and green light cannot be simultaneously enhanced by one excitation light source; in the conventional scheme to simultaneously excite the luminous efficacy of red light and green light by means of light splitting, the excitation intensity of a single light is usually weakened. Reduce the utilization efficiency of a single light.

In view of this, the present invention provides a light source system, which can be used for projection display, can significantly enhance the brightness of the traditional LED light source, expand the application range of the LED light source, and has a simple optical path and a compact volume.

In a first aspect, the present invention provides a light source system, comprising:

a first light source for generating light of a first wavelength;

The first light splitting element is used to transmit and/or reflect the light of the first wavelength incident to the first light splitting element through the first light splitting element, and divide the light of the first wavelength into the first excitation light and the second excitation light; The light of the second wavelength is reflected, and the light of the third wavelength is transmitted;

a first wavelength conversion device for converting the first excitation light into light with a second wavelength and guiding the light to the projection direction;

The second wavelength conversion device is used to convert the second excitation light into light of the third wavelength and guide the light to the projection direction.

The present invention can simultaneously excite the phosphor layers on the surfaces of the two wavelength conversion devices through one light source, that is, the first light source, and simultaneously improve the light efficiency and brightness contribution of the two light colors.

In a possible implementation manner, the method further includes: a first filter element, configured to transmit or reflect the light incident to the first filter element through the first filter element to combine light; the light of the second wavelength is The first light splitting element is reflected to the first filter element; the light of the third wavelength is transmitted to the first filter element through the first light splitter element.

The direction of the light of the second wavelength and the light of the third wavelength can be changed by the first filter element, so that the light can be combined in a desired direction.

In a possible implementation manner, the method further includes: a second light source, configured to generate light of a fourth wavelength, and the light of the fourth wavelength is transmitted or reflected by the first filter element to combine light.

When the light of the second wavelength and the light of the third wavelength cannot synthesize the desired light color, such as white light, a second light source can be introduced to generate the light of the fourth wavelength, and an appropriate fourth wavelength can be selected so that the light of the second wavelength, The light of the third wavelength and the light of the fourth wavelength can synthesize the desired light color, such as white light.

In a possible implementation manner, the method further includes: a second light splitting element, configured to partially transmit or reflect the light of the first wavelength incident to the second light splitting element to the first light splitting element, and partially reflect or reflect it to the first light splitting element. transmits to the second filter element; the second filter element is used to transmit or reflect the light of the first wavelength incident to the second filter element to the first filter element through the second filter element.

When the light of the second wavelength and the light of the third wavelength cannot synthesize the desired light color, such as white light, the light of the first wavelength can be split twice, so that the light of the first wavelength is combined with the light of the second wavelength and the third wavelength. The wavelength of light is combined to form the desired light color, which can save a light source and save costs. At this time, it is necessary to reasonably select the first wavelength, the second wavelength and the third wavelength, so that the light of the first wavelength can excite the corresponding wavelength conversion material to generate the light of the second wavelength and the light of the third wavelength, and the first wavelength can be excited. The light of the wavelength, the light of the second wavelength and the light of the third wavelength can synthesize the desired light color.

In a possible implementation manner, the light of the first wavelength is linearly polarized or approximately linearly polarized polarized light; the first light splitting element includes a transparent substrate on which a light splitting filter film is formed, and the light splitting filter film is made of In order to transmit the light of the first wavelength in the first polarization direction, reflect the light of the first wavelength in the second polarization direction, transmit the light of the first wavelength and the light of the third wavelength, and reflect the light of the second wavelength.

Using the characteristics of linearly polarized light, a spectroscopic filter film is formed on the transparent substrate, and the incident linearly polarized light can be divided into the first excitation light and the second excitation light, so as to excite the phosphor layers on the surfaces of the two wavelength conversion devices at the same time, At the same time, the light efficiency and brightness contribution of the two light colors are improved.

In a possible implementation manner, the light-splitting filter film includes a polarizing light-splitting film and a filter film, wherein the polarizing light-splitting film is used to transmit light of a first wavelength in a first polarization direction, and reflect light of a first wavelength in a second polarization direction. The light of one wavelength; the filter film is used to transmit the light of the first wavelength and the light of the third wavelength, and reflect the light of the second wavelength.

In a possible implementation manner, the method further includes: a polarization converter, configured to control the polarization direction of the light of the first wavelength incident on the polarization converter, and guide the light of the first wavelength to the first light splitting element. Preferably, the polarization converter is an electrically controlled polarization converter.

The polarization direction of the light of the first wavelength incident to the polarization converter is controlled by the polarization converter, and the polarization direction of the light of the first wavelength is controlled as required, and the control timing period is matched with the timing period of the entire light source. Basically, all the light of the first wavelength is used to excite light of a certain wavelength. When the two phosphor layers are excited respectively, the excitation intensity and excitation efficiency of a single light phosphor layer will not be weakened, and the entire light source The structure is simple and compact.

In a possible implementation manner, the first wavelength conversion device and/or the second wavelength conversion device includes a light source and a wavelength conversion material layer, and the light beam of the light source and the light beam of the first excitation light or the second excitation light are respectively converted from wavelengths The two sides of the material layer are irradiated on it, which further improves the light efficiency and brightness of the light of the second wavelength and/or the light of the third wavelength.

In a possible implementation manner, the first wavelength conversion device and/or the second wavelength conversion device is a device with a wavelength conversion material layer formed on the surface thereof.

In a possible implementation manner, the first light source and/or the second light source is an LED light source or a laser light source.

The excitation power of the laser light source is larger than that of the LED light source, which can improve the brightness to a higher level and avoid insufficient excitation of monochromatic light caused by light splitting. Preferably, the outgoing light of the laser light source can first pass through a diffuser to homogenize the laser light to avoid damage to the wavelength conversion material caused by high power density.

Optionally, a lens group is provided in the light beam incident direction and/or light beam exit direction of the first wavelength conversion device and/or the second wavelength conversion device, and a lens group is provided in the light beam exit direction of the first light source and/or the second light source. The light beams incident on the first wavelength conversion device and/or the second wavelength conversion device are condensed by the lens group, and the outgoing light from the first wavelength conversion device and/or the second wavelength conversion device, as well as the first light source and/or the second wavelength conversion device are converged. The emitted light of the two light sources is collimated.

In a possible implementation manner, the light of the first wavelength is blue light or violet light. Both blue and violet light have relatively short wavelengths and are suitable for excitation light.

In a possible implementation, the light colors of the second wavelength light and the third wavelength light are different and selected from red light and green light, or yellow light and blue light.

In a possible implementation manner, the light of the fourth wavelength is blue light.

In a second aspect, the present application provides a projection device, including the light source system according to any one of the first aspect and possible implementations of the first aspect.

The present invention can simultaneously excite the phosphor layers on the surfaces of two wavelength conversion devices (such as red light and green light LED light sources), and by using one excitation light source, the light efficiency and Brightness contribution; compared with the conventional spectroscopic scheme, the present invention does not impair the excitation intensity and excitation efficiency of a single light phosphor layer while exciting two phosphor layers respectively, and the structure of the entire light source is simple and compact, and the cost is low .

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and together with the embodiments of the present invention, they are used to explain the present invention, and do not limit the present invention. In the drawings, the same reference numbers generally refer to the same components or steps. in:

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

FIG. 2 is a schematic structural diagram of a light source system in another embodiment of the present invention;

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

4 is a schematic structural diagram of a light source system in yet another embodiment of the present invention;

5 is a schematic structural diagram of a light source system in yet another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a light source system in yet another embodiment of the present invention.

detailed description

In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. In addition, although the disclosures in the present invention are described in terms of one or several exemplary examples, it should be understood that each aspect of the disclosures may also constitute a complete technical solution individually. The embodiments described below and features in the embodiments may be combined with each other without conflict.

In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to mean serving as an example, illustration or illustration. Any embodiment or design of the present disclosure described as "exemplary" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the word example is used to present a concept in a concrete way.

Unless otherwise defined, technical or scientific terms used in the present invention should have the ordinary meaning as understood by one of ordinary skill in the art to which the present invention belongs. "First," "second," and similar words used herein do not denote any order, quantity, or importance, but are merely used to differentiate the description. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. The term "and/or" includes any and all combinations of one or more of the associated listed items.

For a thorough understanding of the present invention, the following detailed description will be provided in order to explain the technical solutions of the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.

The light source system provided by the embodiment of the present invention includes: a first light source for generating light of a first wavelength; a first light splitting element for transmitting and passing through the first light splitting element the light of the first wavelength incident on the first light splitting element / or reflection, the light of the first wavelength is divided into the first excitation light and the second excitation light; the light of the second wavelength is reflected, and the light of the third wavelength is transmitted; the first wavelength conversion device is used to convert the first wavelength The excitation light is converted into light of the second wavelength and directed to the projection direction; the second wavelength conversion device is used for converting the second excitation light to light of the third wavelength and directed to the projection direction. The wavelength conversion device can be a device with a wavelength conversion material formed on the surface, and the wavelength conversion material can be phosphors, nanoparticles, etc.; the wavelength conversion device can also include a light source and a wavelength conversion material layer, and the wavelength conversion material layer can be evenly coated on the light source. It can also be arranged on other devices, and the light beam of the light source and the light beam of the excitation light in the wavelength conversion device respectively irradiate it from both sides of the wavelength conversion material layer.

In some embodiments, the light of the second wavelength and the light of the third wavelength can synthesize the desired light color. If the desired light color is white light, the yellow light and the blue light can synthesize white light. In some other embodiments, the light of the second wavelength and the light of the third wavelength cannot synthesize the desired light color. In this case, light of other wavelengths can be added, which can be realized by adding a new light source, or by adding a new light source to the first light source. Spectral realization.

The light of the first wavelength may be linearly polarized or approximately linearly polarized polarized light. In this case, the first light splitting element includes a transparent substrate, and a light splitting filter film is formed on the transparent substrate, and the light splitting filter film is used to transmit the first polarized light. The light of the first wavelength in the direction reflects the light of the first wavelength in the second polarization direction, and transmits the light of the first wavelength and the light of the third wavelength, and reflects the light of the second wavelength. In some embodiments, the light-splitting filter film includes a polarizing light-splitting film and a filter film, and the polarizing light-splitting film and the filter film may be arranged on the same side of the transparent substrate, or may be arranged on two sides of the transparent substrate respectively. When the polarizing beam splitting film and the filter film are arranged on the same side of the transparent substrate, the two films can be combined into one film. The polarizing beam splitter film is used to transmit the light of the first wavelength in the first polarization direction and reflect the light of the first wavelength in the second polarization direction; the filter film is used to transmit the light of the first wavelength and the light of the third wavelength, and reflect the light of the first wavelength and the third wavelength. light of the second wavelength. If the light of the first wavelength only includes light of one polarization direction, a polarization converter can be used to control the polarization direction of the light of the first wavelength, so that the light of the first wavelength can be divided into the first excitation light by the first beam splitting element And the second excitation light, for example, can use an electrically controlled polarization converter, such as a liquid crystal light valve, to control the polarization direction of the light of the first wavelength by energizing or not. For example, assuming that the initial polarization direction of the light of the first wavelength relative to the first beam splitting element is P-polarized light, when the electrical polarization converter is not powered on, the light of the first wavelength will remain P-polarized after passing through the electrical polarization converter. The polarization state exits; when the electrically controlled polarization converter is powered on, the polarization direction of the light of the first wavelength is converted from the P polarization state to the S polarization state after passing through the electrically controlled polarization converter. By controlling the polarization direction of the light of the first wavelength by the electrically controlled polarization converter, the sequence of the light source can be controlled, and the structure is simple.

FIG. 1 is a schematic structural diagram of a light source system in an embodiment of the present invention. As shown in FIG. 1 , the light source system includes a first light source 1 , a first light splitting element 2 , a first wavelength conversion device 3 , a second wavelength conversion device 4 , a first filter element 5 and a second light source 6 .

The light of the first wavelength emitted by the first light source 1 is split by the first spectroscopic element 2, and a part of the light is transmitted to form the first excitation light for illuminating the first wavelength conversion device 3, and a part of the light is reflected to form the second wavelength conversion device 4. The second excitation light, the first wavelength conversion device 3 is irradiated by the first excitation light to generate light of the second wavelength and directed to the projection direction, the second wavelength conversion device 4 is illuminated by the second excitation light to generate light of the third wavelength and directed to transmit direction, the light of the second wavelength and the light of the third wavelength are respectively reflected and transmitted by the first beam splitting element 2 to synthesize the desired light color, or, the light of the second wavelength and the third wavelength emitted from the first beam splitting element 2 The light of the desired color is synthesized by the first filter element 5 and the light of the fourth wavelength emitted by the second light source 6 .

It should be noted that the first spectroscopic element 2 is a spectroscopic element with a specific wavelength. In this embodiment, it splits the light of the first wavelength, reflects the light of the second wavelength, and conducts the light of the third wavelength. transmission. The first filter element 5 can transmit the light of the fourth wavelength and reflect the light of the second wavelength and the third wavelength, or can reflect the light of the fourth wavelength and transmit the light of the second wavelength and the third wavelength.

The function of the first light source 1 is to generate light of a first wavelength. In this embodiment, the first light source 1 is a blue LED light source, and the light of the first wavelength is blue light. In other embodiments, the first light source 1 may also be other light sources, such as an ultraviolet light source, a laser light source, and the like. The first light source 1 in this embodiment is an LED light source, and the light generated by the first light source 1 can be collimated first through a lens group (ie, the lens 11 and the lens 12).

In some embodiments, the first wavelength conversion device 3 and the second wavelength conversion device 4 are devices whose surfaces are coated with phosphors, such as phosphor-coated light sources using blue LEDs to excite light of corresponding wavelengths. The color of the phosphor on the first wavelength conversion device 3 is different from the color of the phosphor on the second wavelength conversion device 4 . In this embodiment, the light of the first wavelength is blue light, the first wavelength conversion device 3 is a device coated with red phosphor powder, and the second wavelength conversion device 4 is a device coated with green phosphor powder. The light is red light, and the light of the third wavelength is green light. In other embodiments, the light of the first wavelength can also be light of a shorter wavelength, such as violet light, which can also excite the phosphor layers on the surfaces of the first wavelength conversion device 3 and the second wavelength conversion device 4 at the same time, so as to enhance the second wavelength. The effect of brightness on wavelengths of light and third wavelengths of light, such as red and green. In some embodiments, the first wavelength conversion device 3 and the second wavelength conversion device 4 can be provided with a lens group in both the incident direction and the outgoing direction of the light beam, such as

lenses

21 and 22 in FIG. The incident light of the wavelength conversion device 3 and the second wavelength conversion device 4 is concentratedly irradiating the phosphor layer on the surface thereof, and the outgoing light is collimated.

The function of the second light source 6 is to generate light of the fourth wavelength to synthesize the light of the second wavelength and the light of the third wavelength with a desired light color. In this embodiment, the required light color is white light, the second light source 6 is a blue LED light source, the light of the fourth wavelength is blue light, the blue light is transmitted through the first filter element 5 and the red light reflected by the first filter element 5 Light and green light are combined. In other embodiments, the second light source 6 may also be other light sources, such as a laser light source, etc. The wavelength of the light generated by the second light source 6 is selected according to the wavelengths of the light of the second wavelength and the light of the third wavelength, as long as the three Can synthesize the desired light color. The second light source 6 in this embodiment is an LED light source, and the light generated by the second light source 6 can be collimated by a lens group (ie, the lens 41 and the lens 42 ).

FIG. 2 is a schematic structural diagram of a light source system in another embodiment of the present invention. Compared to the embodiment shown in FIG. 1 , the first light source 1 in this embodiment is a laser light source. The advantage of the laser light source is that its excitation power is larger, which can further improve the excitation efficiency of the phosphor layers on the surfaces of the first wavelength conversion device 3 and the second wavelength conversion device 4, improve the brightness to a higher level, and avoid the occurrence of light splitting. Monochromatic light excitation is insufficient.

In this embodiment, after the excitation light source is emitted, it may first pass through a diffuser 7, which functions to homogenize the laser light and avoid damage to the phosphor layer due to high power density. Other aspects of this embodiment are similar to those of the embodiment shown in FIG. 1 , and details are not described herein again.

FIG. 3 is a schematic structural diagram of a light source system in yet another embodiment of the present invention. As shown in FIG. 3 , the light source system includes a first light source 1 , a first beam splitting element 2 , a first wavelength conversion device 3 , a second wavelength conversion device 4 , a first filter element 5 , a second beam splitter element 8 and a second filter element 8 . Optical element 9.

The light of the first wavelength emitted by the first light source 1 is split by the second beam splitting element 8, a part is transmitted to the first beam splitting element 2, and a part is reflected to the second filter element 9. In other embodiments, a part of the light can also be reflected. To the beam splitter element 2 , a part is transmitted to the second filter element 9 . The light of the first wavelength incident on the second filter element 9 is reflected or transmitted to the first filter element 5 by the second filter element 9 , and then transmitted or reflected by the first filter element 5 to combine light.

The difference of this embodiment is that the light of the first wavelength generated by the first light source 1 is split twice, the second light source 6 can be omitted, and the cost is saved, and it is usually used in scenes with sufficient excitation light intensity. Other aspects of this embodiment are similar to those of the embodiment shown in FIG. 2 , and details are not described herein again.

FIG. 4 is a schematic structural diagram of a light source system in still another embodiment of the present invention. As shown in FIG. 4 , the light source system includes a first light source 1 , a first light splitting element 2 , a first wavelength conversion device 3 , a second wavelength conversion device 4 , a first filter element 5 , a second light source 6 and a polarization converter 10 .

In this embodiment, the light of the first wavelength generated by the first light source 1 is linearly polarized or approximately linearly polarized polarized light, and the first light source 1 is preferably a laser light source. It is a homogenized laser to avoid damage to the phosphor layer due to high power density. The first beam splitting element 2 includes a transparent substrate 201. The transparent substrate 201 can be a transparent substrate such as glass. The transparent substrate 201 is coated with a polarizing beam splitting film 202 and a filter film 203 with a specific wavelength. The polarizing beam splitting film 202 and the filter film 203 can be They are located on both sides of the transparent substrate 201, respectively, or on the same side of the transparent substrate 201. The polarizing beam splitting film 202 and the filter film 203 can also be combined into one film, that is, a film is coated on the transparent substrate 201 to realize polarization beam splitting at the same time. The role of the film 202 and the filter film 203. The function of the polarizing beam splitter film 202 is to transmit the light of the first wavelength in the first polarization direction and reflect the light of the first wavelength in the second polarization direction, such as transmitting the P-polarized light of blue light and reflecting the S-polarized light of blue light. The function of the filter film 203 is to transmit the light of the first wavelength and the light of the third wavelength, and reflect the light of the second wavelength, such as transmitting blue light and green light and reflecting red light. The polarization converter 10 is an electronically controlled polarization converter, and controls the polarization direction of the light of the first wavelength by whether it is energized or not.

This embodiment can be used in a light source system requiring timing control. The power-on timing of the polarization converter 10 is matched with the timing period of the entire light source system. When the light source system needs to emit light of the second wavelength, the polarization converter 10 ensures that the first wavelength is emitted. The light of the first wavelength is transmitted in the first polarization direction, so that the light of the first wavelength will be transmitted and irradiated on the phosphor layer of the first wavelength conversion device 3 through the first light splitting element 2, so as to improve the luminous efficiency of the light of the second wavelength; When the light source system needs the light of the third wavelength to exit, the polarization converter 10 ensures that the light of the first wavelength is transmitted in the second polarization direction, so that the light of the first wavelength will be reflected by the first light splitting element 2 and irradiated to the second wavelength conversion. On the phosphor layer of the device 4, the luminous efficiency of the light of the third wavelength is improved. In this way, the light of the first wavelength can simultaneously improve the luminous efficiency of the light of the second wavelength and the light of the third wavelength in one cycle, and the excitation intensity of each light will not be weakened by the light splitting.

Exemplarily, the light generated by the first light source 1 is P-polarized light, the light of the first wavelength and the light of the fourth wavelength are both blue light, the light of the second wavelength and the light of the third wavelength are red light and green light, respectively, The light of the first wavelength in the first polarization direction is P-polarized light, and the light of the first wavelength in the second polarization direction is S-polarized light. The entire light source system is required to output red, green and blue light in sequence, and TR:TG:TB=4:4 : 2, where TR, TG and TB respectively represent the time ratio of red, green and blue light in one cycle (10s). In one cycle, in the first 4s, the first light source 1 generates P-polarized light of blue light, the polarization converter 10 is not energized, and the blue light is emitted in the P-polarized state, and is transmitted to the first wavelength conversion device 3 after being transmitted by the first light splitting element 2. On the red phosphor layer, red light is generated, the red light is reflected by the first light splitting element 2 and then incident on the first filter element 5, and then reflected by the first filter element 5 and then output; in 5-8s, the polarization converter 10 After power is turned on, the polarization direction of blue light is converted from P polarization state to S polarization state after passing through the polarization converter 10. After being reflected by the first light splitting element 2, it is irradiated on the green phosphor layer of the second wavelength conversion device 4 to generate green light, green light, and green light. After being transmitted by the first light splitting element 2, the light is incident on the first filter element 5, and then reflected by the first filter element 5 and then output; in 9-10s, the first light source 1 is turned off, the polarization converter 10 is not powered on, and the second light source 1 is turned off. The light source 6 is turned on to generate blue light, which is transmitted through the first filter element 5 and then output. In this way, the blue light generated by the first light source 1 can simultaneously improve the luminous efficiency of red light and green light in one cycle, and the excitation intensity of each light will not be weakened by the light splitting, that is, when the luminous efficiency of red light is improved, the first Substantially all of the laser light emitted by the first light source 1 is used to excite red light. When improving the luminous efficiency of green light, substantially all of the laser light emitted by the first light source 1 is used to excite green light.

The function of the first filter element 5 is to synthesize the light of the second wavelength and the light of the third wavelength emitted by the first light splitting element 2 and the light of the fourth wavelength emitted by the second light source 6 into a desired light color. In this embodiment, the second light source 6 is an LED light source. Of course, the second light source 6 may also be other types of light sources, such as a laser light source, as shown in FIG. 5 .

In addition, it should be noted that the first light source 1 may be a blue laser or a linearly polarized light source with a shorter wavelength, such as a violet laser, which can also enhance the light of the second wavelength and the light of the third wavelength (such as red light and green light) brightness effect.

FIG. 6 is a schematic structural diagram of a light source system in yet another embodiment of the present invention. As shown in FIG. 6 , the light source system includes a first light source 1 , a first light splitting element 2 , a first wavelength conversion device 3 , a second wavelength conversion device 4 , a first filter element 5 , a second light splitting element 8 and a second filter Optical element 9.

The difference between this embodiment and the embodiment shown in FIG. 4 is that the light of the first wavelength is split twice, the second light source 6 can be omitted, and the cost is saved, and it is usually used in scenes with sufficient excitation light intensity. Other aspects of this embodiment are similar to those of the embodiment shown in FIG. 4 , and details are not described herein again.

The light source system of the present invention can be applied to any application scenarios that require synthetic light, including but not limited to projectors, such as single DLP projectors or triple DLP projectors.

Embodiments of the present invention also provide a projection device, including the light source system involved in the above embodiments, and the projection device further includes other components, such as a projection lens, etc., the settings of these components can be found in the related art, and details are not repeated here.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items. The character "/" in this text generally indicates that the related objects are an "or" relationship.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

A light source system, characterized in that it includes:

a first light source for generating light of a first wavelength;

The first light splitting element is used to transmit and/or reflect the light of the first wavelength incident to the first light splitting element through the first light splitting element, and divide the light of the first wavelength into the first excitation light and the second excitation light; The light of the second wavelength is reflected, and the light of the third wavelength is transmitted;

a first wavelength conversion device for converting the first excitation light into light with a second wavelength and guiding the light to the projection direction;

The second wavelength conversion device is used to convert the second excitation light into light of the third wavelength and guide the light to the projection direction.
A light source system according to claim 1, further comprising:

a first filter element, which is used to transmit or reflect the light incident to the first filter element through the first filter element to combine light;

The light of the second wavelength is reflected to the first filter element through the first beam splitting element; the light of the third wavelength is transmitted to the first filter element through the first beam splitter element.
A light source system according to claim 2, further comprising:

The second light source is used for generating light of a fourth wavelength, and the light of the fourth wavelength is transmitted or reflected by the first filter element for light combination.
A light source system according to claim 2, further comprising:

The second light splitting element is used to partially transmit or reflect the light of the first wavelength incident to the second light splitting element to the first light splitting element, and partially reflect or transmit it to the second filter element;

The second filter element is used to transmit or reflect the light of the first wavelength incident to the second filter element to the first filter element through the second filter element.
The light source system according to any one of claims 1-4, wherein the light of the first wavelength is linearly polarized or approximately linearly polarized polarized light; the first light splitting element comprises a transparent substrate, and the transparent substrate is formed There is a spectroscopic filter film for transmitting light of a first wavelength in a first polarization direction, reflecting light of a first wavelength in a second polarization direction, and transmitting light of the first wavelength and light of a third wavelength light, reflecting light of the second wavelength.
A light source system according to claim 5, wherein the light splitting filter film comprises a polarized light splitting film and a filter film, wherein,

The polarizing beam splitter film is used to transmit light of a first wavelength in a first polarization direction and reflect light of a first wavelength in a second polarization direction;

The filter film is used to transmit the light of the first wavelength and the light of the third wavelength, and reflect the light of the second wavelength.
A light source system according to claim 5, further comprising:

The polarization converter is used to control the polarization direction of the light of the first wavelength incident on the polarization converter, and guide the light of the first wavelength to the first light splitting element.
The light source system according to claim 7, wherein the polarization converter is an electrically controlled polarization converter.
The light source system according to any one of claims 1-4, wherein the first wavelength conversion device and/or the second wavelength conversion device comprises a light source and a wavelength conversion material layer.
The light source system according to any one of claims 1-4, wherein the first wavelength conversion device and/or the second wavelength conversion device are devices with a wavelength conversion material layer formed on the surface.
The light source system according to claim 3, wherein the first light source and/or the second light source is an LED light source or a laser light source.
A light source system according to any one of claims 1-4, characterized in that, further comprising a diffusing sheet disposed in the light beam exit direction of the first light source.
A light source system according to claim 3, wherein a lens group is provided in the light beam incident direction and/or the light beam exit direction of the first wavelength conversion device and/or the second wavelength conversion device, and the first light source and/or A lens group is arranged in the light beam exit direction of the second light source.
The light source system according to any one of claims 1-4, wherein the light of the first wavelength is blue light or violet light.
A light source system according to any one of claims 1-4, characterized in that the light colors of the light of the second wavelength and the light of the third wavelength are different and differ between red light and green light, or, yellow light and Choose from Blu-ray.
The light source system according to claim 3, wherein the light of the fourth wavelength is blue light.
A projection device, characterized by comprising the light source system according to any one of claims 1-16.