CN219302865U - Mixed light source module and projection equipment - Google Patents
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Abstract
The utility model discloses a hybrid light source module and projection equipment, and relates to the field of optics. The mixed light source module comprises a first laser light source, a second laser light source, an LED light source and a light combining element, wherein the first laser light source is used for emitting first laser with a first wavelength; the second laser light source is used for emitting second laser with a second wavelength; the LED light source is used for emitting third light with a third wavelength; the light combining element is used for guiding the first laser, the second laser and the third light to exit from the same direction, and at least one of the first laser light source and the second laser light source and the LED light source are positioned on different sides of the light combining element. According to the utility model, through the light combination design of the two laser light sources and the LED light source, both the color gamut and the brightness are realized.
Description
Technical Field
The present utility model relates to the field of optics, and in particular, to a hybrid light source module and a projection device.
Background
Currently, two types of light source modules, namely a Light Emitting Diode (LED) and a laser semiconductor (LD), are mainly provided in the projection products on the market, and the two types of light source modules have different characteristics. Compared with the traditional LED light source, the laser light source can provide better color purity and better system efficiency, and correspondingly, the price of the laser is higher, and the price of the highlighting machine is high by using the laser light source.
Disclosure of Invention
In view of the above, the present utility model provides a hybrid light source module and a projection apparatus, which can achieve both high brightness and high color purity by combining the laser light source and the LED light source.
In a first aspect, the present utility model provides a hybrid light source module, including a first laser light source, a second laser light source, an LED light source, and a light combining element,
the first laser light source is used for emitting first laser with a first wavelength;
the second laser light source is used for emitting second laser with a second wavelength;
the LED light source is used for emitting third light with a third wavelength;
the light combining element is used for guiding the first laser, the second laser and the third light to exit from the same direction, and at least one of the first laser light source and the second laser light source and the LED light source are positioned on different sides of the light combining element.
In a possible implementation manner, the first laser light source and the second laser light source are located on the same side of the light combining element.
In a possible implementation, the third light is the same color as one of the first laser light and the second laser light.
In a possible implementation, the third light is blue light, and one of the first laser light and the second laser light, which is different in color from the third light, is a red laser light or a green laser light; or,
the third light is red light, and one of the first laser light and the second laser light, which is different in color from the third light, is blue laser light or green laser light; or,
the third light is green light, and one of the first laser light and the second laser light, which is different in color from the third light, is blue laser light or red laser light.
In a possible implementation manner, an optical axis of the first laser light emitted by the first laser light source and an optical axis of the second laser light emitted by the second laser light source are parallel to each other.
In a possible implementation manner, the first laser light source includes a first laser and a first light homogenizing element, where the first light homogenizing element is used to perform light homogenizing treatment on first laser light emitted by the first laser;
the second laser light source comprises a second laser and a second light homogenizing element, and the second light homogenizing element is used for homogenizing second laser emitted by the second laser.
In a possible implementation manner, the first laser light source further includes a reflecting element, where the reflecting element is located between the first laser and the first light homogenizing element, and the reflecting element is configured to reflect the first laser light emitted by the first laser to the first light homogenizing element.
In a possible implementation manner, a gaussian half angle of at least one of the first light homogenizing element and the second light homogenizing element is less than or equal to 6 degrees.
In a possible implementation, at least one of the first light homogenizing element and the second light homogenizing element is a diffuser.
In a possible implementation, at least one of the first laser light source and the second laser light source further comprises a beam expanding element;
when the first laser light source comprises a beam expanding element, the first laser light source further comprises a first beam expanding element, wherein the first beam expanding element is used for expanding the spot area of the light beam emitted by the first light homogenizing element and compressing the diffusion angle of the light beam emitted by the first light homogenizing element;
when the second laser light source comprises a beam expanding element, the second laser light source further comprises a second beam expanding element, and the second beam expanding element is used for expanding the spot area of the light beam emitted by the second light homogenizing element and compressing the diffusion angle of the light beam emitted by the second light homogenizing element.
In a possible implementation manner, the beam expanding element includes a first lens and a second lens sequentially arranged along an optical path, an optical axis of the first lens and an optical axis of the second lens are parallel to each other, and a distance between the optical axes of the first lens and the second lens is greater than zero.
In one possible implementation, the first lens is a negative lens and the second lens is a positive lens.
In a possible implementation manner, the optical fiber optical system further comprises a functional element, wherein the functional element is used for compressing the diffusion angle of the light beam emitted by the light combination element;
and the intersection points of the optical axis of the first laser emitted by the first laser source and the intersection point of the optical axis of the second laser emitted by the second laser source and the light combining element are respectively positioned at two sides of the intersection point of the optical axis of the functional element and the light combining element.
In a possible implementation manner, the light combining element includes a first area and a second area, wherein,
the first area is used for guiding at least part of the second laser emitted by the second laser source and at least part of the third light emitted by the LED source;
the second region is used for guiding at least part of the first laser emitted by the first laser light source.
In a possible implementation, the second region is offset from a central position of the first region.
In a possible implementation manner, the second area is an open area or an antireflection film area or a light transmission area or a scattering area or a phase difference area.
In a second aspect, the present utility model provides a projection apparatus, including the hybrid light source module set in the first aspect.
According to the utility model, through the light combination design of the two laser light sources and the LED light source, both the color gamut and the brightness are realized. In addition, the beam expanding element can improve the laser efficiency, and the large-angle static light homogenizing element (such as a static diffusion sheet) replaces the dynamic light homogenizing element (such as a dynamic diffusion wheel), so that the volume of the light source module is reduced. The utility model separates the two lasers through off-axis design, so that the power density superposition of the optical element can be reduced.
Drawings
The above and other objects, features and advantages of the present utility model will become more apparent from the following more particular description of embodiments of the present utility model, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, and not constitute a limitation to the utility model. In the drawings, like reference numerals generally refer to like parts. Wherein:
FIG. 1 is a schematic block diagram of a projection apparatus according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a hybrid light source module according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of another hybrid light source module according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a light combining element according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of another hybrid light source module according to an embodiment of the present utility model.
Detailed Description
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model. Furthermore, while the present disclosure has been described in terms of an exemplary embodiment or embodiments, it should be understood that each aspect of the disclosure may be separately implemented as a complete solution. The following embodiments and features of the embodiments may be combined with each other without conflict.
In embodiments of the present utility model, "at least one" means one or more, and "a plurality" means two or more. The terms "first," "second," and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The term "and/or" includes any and all combinations of one or more of the associated listed items. It is to be understood that the terms "upper," "lower," "inner," "outer," "front," "back," and the like are merely used for convenience in describing the utility model and to simplify the description, and are not to be construed as implying or indicating a limitation on the utility model.
In order that the utility model may be fully understood, a detailed description will be provided below in order to illustrate the technical aspects of the utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
Fig. 1 is a schematic block diagram of a projection apparatus according to an embodiment of the present utility model. As shown in fig. 1, the projection device 10 includes a light combining system 11, an illumination system 12, and an imaging system 13, wherein a light source module is disposed in the light combining system 11, the light combining system 11 is used for collimating and combining light of a light source, and outputting red, green, and blue three-color light through a light homogenizing element, and the light homogenizing element can be a compound eye, a light rod, and the like; the illumination system 12 is used for illuminating the homogenized light beam onto a light valve, and the light valve can be a DMD chip, an LCOS chip or an LCD chip; the imaging system 13 is used to optically image the light exiting the light valve onto a screen, typically a lens system.
Fig. 2 is a schematic structural diagram of a hybrid light source module according to an embodiment of the present utility model. As shown in fig. 2, the hybrid light source module includes a first laser light source 110, a second laser light source 120, an LED light source 130, and a light combining element 140, where the first laser light source 110 is configured to emit a first laser light with a first wavelength; the second laser light source 120 is configured to emit a second laser light of a second wavelength; the LED light source 130 is configured to emit a third light of a third wavelength; the light combining element 140 is configured to guide the first laser light, the second laser light, and the third laser light to exit from the same direction, and then enter a following functional element 150, such as a compensation lens, where the functional element 150 may be configured to compress a spread angle of the light beam exiting from the light combining element 140.
The colors of the first laser light and the second laser light may be the same or different, and in this embodiment, it is assumed that the colors of the first laser light and the second laser light are different, the first laser light is blue laser light, and the second laser light is red laser light. In other embodiments, the colors of the first laser light and the second laser light may be red and green, respectively, green and blue, respectively, yellow and red, respectively, or metameric red (or green or blue), respectively, which embodiments of the utility model are not limited.
The first laser light source 110 and the second laser light source 120 may be located on two different light emitting chips, or may be located on the same light emitting chip, and the first laser light source 110 and the second laser light source 120 may be a single light emitting element or an array of light emitting elements. Further, the light emitting element arrays on the same chip may include light emitting elements of different colors.
With continued reference to fig. 2, the first laser light source 110 and the second laser light source 120 may combine light through the dichroic element 101, where the dichroic element 101 is configured to transmit the first laser light and reflect the second laser light. The first laser source 110 and the second laser source 120 are located on the same side of the light combining element 140 and are located on different sides of the light combining element 140 from the LED light source 130, and in other embodiments, one of the first laser source 110 and the second laser source 120 may be located on the same side of the light combining element 140 as the LED light source 130, and the other may be located on different sides of the light combining element 140 as the LED light source 130, so as to facilitate light combining. Further, the laser beam after being combined by the dichroic element 101 can pass through the diffusion element 102 to attach diffusion particles, so that the incident light phase is randomly changed, the effect of weakening laser speckles is achieved, and meanwhile, light spots can be homogenized to eliminate uneven stripes of a picture.
The wavelength band of the LED light source 130 is similar to that of one of the first and second laser light sources 110 and 120, i.e., the LED light source 130 is the same color as one of the first and second laser light sources 110 and 120. In the embodiment of the present utility model, it is assumed that the wavelength band of the LED light source 130 is similar to the wavelength band of the first laser light source 110, for example, the LED light source 130 and the first laser light source 110 emit blue light, the second laser light source 120 emits red light, or the LED light source 130 and the first laser light source 110 emit green light, the second laser light source 120 emits red light, so as to improve the brightness of the blue light or the green light, and compared with the LED light source and the first laser light source 110 which emit red light, the brightness of the whole light source module can be further improved.
Fig. 3 is a schematic structural diagram of another hybrid light source module according to an embodiment of the present utility model. As shown in fig. 3, the first laser light emitted by the first laser light source 110 and the second laser light emitted by the second laser light source 120 are incident on the light combining element 140 side by side, that is, the optical axes of the first laser light emitted by the first laser light source 110 and the second laser light emitted by the second laser light source 120 are parallel to each other. Further, the optical axis of the first laser light and the optical axis of the second laser light may be located on both sides of the optical axis of the functional element 150, respectively. In some embodiments, if the lasers of the first laser source 110 and the second laser source 120 are arranged side by side, physical interference may be generated, so that a reflective element may be added to one of the first laser source 110 and the second laser source 120 to change the laser direction of the laser, and the changed laser direction is optically parallel to the laser emitted by the laser in the other laser source. According to the embodiment of the utility model, the two lasers are separated through the off-axis design, so that the power density superposition of the optical element can be reduced.
With continued reference to fig. 3, the first laser light source 110 includes a first laser 111 and a first light homogenizing element 113, where the first light homogenizing element 113 is configured to perform light homogenizing treatment on the first laser light emitted from the first laser 111; the second laser light source 120 includes a second laser 121 and a second light homogenizing element 122, and the second light homogenizing element 122 is configured to perform light homogenizing treatment on the second laser light emitted from the second laser 121. Optionally, the first light homogenizing element 113 and/or the second light homogenizing element 122 may be a diffusing element, such as a static diffusion sheet or a dynamic diffusion wheel, and diffusion particles are attached to make the incident light phase change randomly, so as to achieve the effect of reducing laser speckle, and at the same time, the light spots can be homogenized, so as to eliminate non-uniform stripes of the picture, and further, the gaussian half angle of the diffusing element is less than or equal to 6 °, which is beneficial to eliminating the non-uniform stripe phenomenon of the picture. The gaussian half angle herein refers to a positive cut angle formed by the corresponding diffusion distance and transmission distance when the light intensity is reduced to 50% of the peak value.
In some embodiments, the first laser light source 110 further includes a beam expanding element, or the second laser light source 120 further includes a beam expanding element, or the first laser light source 110 and the second laser light source 120 further include beam expanding elements, such as a beam expanding lens group, for compressing the beam angle under the condition that the beam caliber increases, that is, expanding the spot area of the beam and compressing the spreading angle of the beam, which can improve the laser efficiency and replace dynamic light homogenizing elements (such as dynamic diffusion wheels) with high-angle static light homogenizing elements (such as static diffusion sheets), so as to reduce the volume of the light source module. Illustratively, the beam expanding element includes a first lens and a second lens sequentially disposed along the optical path, and further, an optical axis of the first lens is parallel to an optical axis of the second lens, and a distance between the optical axis of the first lens and the optical axis of the second lens is greater than zero, so as to mitigate an influence of off-axis designs of the first laser light source 110 and the second laser light source 120.
As shown in fig. 3, the first laser source 110 includes a first beam expander 114, the first beam expander 114 includes a negative lens and a positive lens sequentially disposed along an optical path, the first laser light emitted by the first laser 111 is reflected by the reflective element 112 to the first light homogenizing element 113, and is angularly diffused, and then passes through the first beam expander 114 to expand the spot area and compress the diffusion angle, and then is incident on the light combining element 140.
The second laser light source 120 includes a second beam expander 123, the second beam expander 123 includes a negative lens and a positive lens sequentially disposed along the optical path, and the second laser light emitted by the second laser 121 passes through the second light homogenizing element 122, is angularly diffused, passes through the second beam expander 123, expands the spot area, compresses the diffusion angle, and is incident on the light combining element 140.
The light combining element 140 may perform wavelength light combining or physical light combining, for example, the LED light source 130 emits red LED light, the first laser light source 110 emits red laser light, the second laser light source 120 emits blue laser light, and the light combining element 140 may be a dichroic element, transmit red laser light and blue laser light, reflect red LED light, and combine light by wavelength, because the red LED light is far from the wavelength band of the red laser light. For example, the LED light source 130 emits blue LED light, the first laser light source 110 emits blue laser light, the second laser light source 120 emits red laser light, and since the blue LED light is closely spaced from the wavelength band of the blue laser light, the light combining element 140 may be divided into two regions, a first region a and a second region B, as shown in fig. 4, where the first region a is used to implement reflection of the blue LED light and transmission of the red laser light, and the second region B is used to implement transmission of the blue laser light, for example, the first region a is a dichroic mirror region that reflects red and blue, the second region B is an opening region or an antireflection film region that reflects blue (there is no reflection light in theory), and optionally, the second region B may also be a light transmitting region or a scattering region or a phase difference region, so as to enhance the light efficiency. Further, the second area B deviates from the center position of the first area a, as shown in fig. 4, so that the position of the opening can be prevented from being at the position with the highest gaussian spot intensity, and the loss of light efficiency can be reduced by avoiding the center position.
The functional element 150 may be a compensation lens, and is disposed behind the light combining element 140 for converging the light with a large angle.
The following description will further be made by taking the first laser 111 as a blue laser source, for example, the dominant wavelength is 465nm, the second laser 121 as a red laser source, for example, the dominant wavelength is 640 nm, and the LED light source 130 as a blue LED source, for example, the dominant wavelength is 455 nm.
Referring again to fig. 3, the blue laser light emitted by the first laser 111 is separated from the red laser light emitted by the second laser 121, and is respectively transmitted through the diffusion element, and after being angularly expanded, the beam area is expanded by the beam expansion lens group by compressing the beam angle, so that the laser efficiency under the large-angle diffusion sheet is improved. Wherein, the blue laser light is transmitted through the second region B (e.g., the aperture region) of the light combining element 140, and the red laser light is transmitted through the first region a (e.g., the dichroic mirror region) of the light combining element 140. Then slightly compressed by the compensating lens. The lambertian light source emitted by the blue LED light source is compressed, collimated, and then irradiated onto the light combining element 140 by the collimating lens group, wherein most of the light beam irradiates on a first area a (such as a dichroic mirror area) of the light combining element 140 to cause reflection, and a small part of the light beam irradiates on a second area B (such as an opening area) of the light combining element 140 to generate a small efficiency loss. And then the LED light beam passes through a compensation lens, and the angle is further compressed to complete the light combination with the laser light path.
Fig. 5 is a schematic structural diagram of another hybrid light source module according to an embodiment of the present utility model. Unlike the embodiment shown in fig. 2, the hybrid light source module further includes a fourth light source 160 and a color filter 170, where the fourth light source 160 is configured to emit light with a fourth wavelength, such as one or more of green light, blue light, and red light, and the color filter 170 is configured to guide the light with the fourth wavelength emitted by the fourth light source 160 and the light beam emitted by the functional element 150 to exit from the same direction. Illustratively, the color filter 170 is a dichroic plate that reflects blue and red light and transmits green light, the fourth light source 160 is configured to emit a green light beam, the red light beam and the blue light beam emitted by the functional element 150 are reflected by the color filter 170, and the green light beam emitted by the fourth light source 160 is transmitted by the color filter 170, so as to complete the light combination of the green light beam, the red light beam and the blue light beam.
The fourth light source 160 may be a light source such as a light emitting diode or a laser, or may be a single light emitting element or an array of light emitting elements, and further, the array of light emitting elements on the same chip may include light emitting elements with different colors, which is not limited in the embodiment of the present utility model. In some embodiments, the fourth light source 160 includes a blue excitation light source and a wavelength conversion device that generates green fluorescence under the irradiation of the blue excitation light source, and further, the wavelength conversion device may be a green phosphor layer or a green phosphor sheet on the surface of the blue light source, so that the wavelength conversion device can receive the excitation of the two side light sources, and the excitation efficiency is improved.
It should be noted that, the corresponding transmission function in the above embodiment may be changed into reflection, and the reflection function is changed into transmission, so that the function implementation of the whole light path is not affected, and the present utility model will not be described in detail.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (17)
1. A hybrid light source module is characterized by comprising a first laser light source, a second laser light source, an LED light source and a light combining element, wherein,
the first laser light source is used for emitting first laser with a first wavelength;
the second laser light source is used for emitting second laser with a second wavelength;
the LED light source is used for emitting third light with a third wavelength;
the light combining element is used for guiding the first laser, the second laser and the third light to exit from the same direction, and at least one of the first laser light source and the second laser light source and the LED light source are positioned on different sides of the light combining element.
2. The hybrid light source module of claim 1, wherein the first laser light source and the second laser light source are located on the same side of the light combining element.
3. The hybrid light source module of claim 1, wherein the third light is the same color as one of the first laser light and the second laser light.
4. A hybrid light source module as recited in claim 3, wherein the third light is blue light and one of the first laser light and the second laser light having a different color than the third light is red laser light or green laser light; or,
the third light is red light, and one of the first laser light and the second laser light, which is different in color from the third light, is blue laser light or green laser light; or,
the third light is green light, and one of the first laser light and the second laser light, which is different in color from the third light, is blue laser light or red laser light.
5. The hybrid light source module of claim 2, wherein an optical axis of the first laser light emitted by the first laser light source and an optical axis of the second laser light emitted by the second laser light source are parallel to each other.
6. The hybrid light source module of claim 5, wherein the first laser light source comprises a first laser and a first light homogenizing element, and the first light homogenizing element is used for homogenizing the first laser light emitted by the first laser;
the second laser light source comprises a second laser and a second light homogenizing element, and the second light homogenizing element is used for homogenizing second laser emitted by the second laser.
7. The hybrid light source module of claim 6, wherein the first laser light source further comprises a reflective element, the reflective element is located between the first laser and the first light homogenizing element, and the reflective element is configured to reflect the first laser light emitted from the first laser to the first light homogenizing element.
8. The hybrid light source module of claim 6, wherein the gaussian half angle of at least one of the first light homogenizing element and the second light homogenizing element is 6 degrees or less.
9. The hybrid light source module as recited in claim 6, wherein at least one of the first light homogenizing element and the second light homogenizing element is a diffuser.
10. The hybrid light source module of claim 6, wherein at least one of the first laser light source and the second laser light source further comprises a beam expanding element;
when the first laser light source comprises a beam expanding element, the first laser light source further comprises a first beam expanding element, wherein the first beam expanding element is used for expanding the spot area of the light beam emitted by the first light homogenizing element and compressing the diffusion angle of the light beam emitted by the first light homogenizing element;
when the second laser light source comprises a beam expanding element, the second laser light source further comprises a second beam expanding element, and the second beam expanding element is used for expanding the spot area of the light beam emitted by the second light homogenizing element and compressing the diffusion angle of the light beam emitted by the second light homogenizing element.
11. The hybrid light source module of claim 10, wherein the beam expanding element comprises a first lens and a second lens arranged in sequence along the optical path, the optical axis of the first lens and the optical axis of the second lens are parallel to each other, and the distance between the optical axis of the first lens and the optical axis of the second lens is greater than zero.
12. The hybrid light source module of claim 11, wherein the first lens is a negative lens and the second lens is a positive lens.
13. The hybrid light source module of claim 5, further comprising a functional element for compressing a spread angle of the light beam emitted from the light combining element;
and the intersection points of the optical axis of the first laser emitted by the first laser source and the intersection point of the optical axis of the second laser emitted by the second laser source and the light combining element are respectively positioned at two sides of the intersection point of the optical axis of the functional element and the light combining element.
14. The hybrid light source module as recited in claim 1, wherein the light combining element comprises a first region and a second region, wherein,
the first area is used for guiding at least part of the second laser emitted by the second laser source and at least part of the third light emitted by the LED source;
the second region is used for guiding at least part of the first laser emitted by the first laser light source.
15. The hybrid light source module as recited in claim 14, wherein the second region is offset from a center position of the first region.
16. The hybrid light source module as recited in claim 14, wherein the second region is an open area or an antireflection film area or a light transmission area or a scattering area or a phase difference area.
17. A projection device comprising the hybrid light source module of any one of claims 1-16.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117389106A (en) * | 2023-12-08 | 2024-01-12 | 宜宾市极米光电有限公司 | Projection light source |
| WO2024109627A1 (en) * | 2022-11-25 | 2024-05-30 | 先临三维科技股份有限公司 | Illuminating device and scanner |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024109627A1 (en) * | 2022-11-25 | 2024-05-30 | 先临三维科技股份有限公司 | Illuminating device and scanner |
| CN117389106A (en) * | 2023-12-08 | 2024-01-12 | 宜宾市极米光电有限公司 | Projection light source |
| CN117389106B (en) * | 2023-12-08 | 2024-04-02 | 宜宾市极米光电有限公司 | Projection light source |
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