CN114460799B - Laser display light source system and laser display equipment - Google Patents
Laser display light source system and laser display equipment Download PDFInfo
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- CN114460799B CN114460799B CN202210371004.5A CN202210371004A CN114460799B CN 114460799 B CN114460799 B CN 114460799B CN 202210371004 A CN202210371004 A CN 202210371004A CN 114460799 B CN114460799 B CN 114460799B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
Abstract
The invention relates to the technical field of laser display, and provides a laser display light source system and laser display equipment. The laser display light source system comprises a laser module, a polarization beam splitter prism, a polarization adjusting module and an optical waveguide module, wherein the polarization beam splitter prism is arranged on a light outgoing path of the laser module, a laser beam generated by a laser is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism, the first beam is emitted along a first light path, and the second beam is emitted along a second light path; the polarization adjusting module is arranged on the first light path and used for adjusting the polarization direction of the first light beam into a second polarization direction; the optical waveguide module is arranged on the light outgoing paths of the first light beam and the second light beam and used for coupling the first light beam and the second light beam and then emitting the coupled light beams. The invention fully utilizes the laser generated by the laser light source, improves the light energy utilization rate, effectively solves the problem of the enlargement of the spot size, keeps higher light beam quality and improves the laser display effect.
Description
Technical Field
The invention relates to the technical field of laser display, in particular to a laser display light source system and laser display equipment.
Background
The laser display is used as a new generation display technology, not only can reach the advanced technical indexes of the existing display technology, but also has at least the following advantages: (1) the laser has good monochromaticity, the spectral line is a linear spectrum, the wavelength is flexibly and variously selected, and the wavelength stability is good, so that the color gamut displayed by the laser is wider, the color purity and the saturation are higher, and the color is richer and more vivid; (2) the laser has high brightness and good directivity, and can realize super large picture size or long-distance projection display; (3) the laser display has low power consumption, long service life and high reliability. Therefore, the laser display has very wide application prospect.
In the laser Display device, the optical portion mainly includes three primary colors laser light source systems, an illumination optical system, an optical modulation projection system, a Display screen, and the like, wherein the optical modulation Display mainly adopts three implementation modes of LCD (Liquid Crystal Display), DMD (Digital micro Devices, Digital micro mirrors), and LCoS (Liquid Crystal on Silicon). The LCoS can normally work only by linearly polarized light, and therefore when the LCoS is used as the light modulator, light generated by the light source needs to be split by a PBS (Polarization Beam Splitter) and then enters the LCoS, so that the light energy utilization rate is reduced, and the laser display effect is affected.
Disclosure of Invention
The invention aims to provide a laser display light source system and laser display equipment, and aims to solve the technical problems of low picture brightness and poor laser display effect caused by low light energy utilization rate in the prior art.
In order to realize the purpose, the invention adopts the technical scheme that:
in a first aspect, the present invention provides a laser display light source system, comprising:
the laser module comprises a laser for generating a laser beam;
the laser module comprises a laser module, a polarization beam splitter prism, a first light source and a second light source, wherein the laser module is arranged on a light emergent path of the laser module;
the polarization adjusting module is arranged on a first light path of the polarization beam splitter prism and at least used for adjusting the polarization direction of the first light beam to a second polarization direction;
and the optical waveguide module is arranged on the light emitting paths of the first light beam and the second light beam and is used for coupling the first light beam and the second light beam and then emitting the coupled light beams.
In one embodiment, the polarization adjustment module includes a wave plate unit and a first reflector, the wave plate unit and the first reflector are disposed on a first light path of the polarization splitting prism, a first light beam emitted after passing through the wave plate unit and the first reflector is parallel to a second light beam, and a polarization direction of the first light beam is the same as a polarization direction of the second light beam.
In one embodiment, the wave plate unit is arranged on the first light path of the polarization splitting prism;
the first reflector is arranged on the light-emitting path of the wave plate unit, the directions of the first light beam and the second light beam reflected by the first reflector are parallel, and the polarization direction of the first light beam is the same as that of the second light beam.
In one embodiment, the first reflector is arranged on a first light path of the polarization beam splitter prism, and the direction of the first light beam reflected by the first reflector is parallel to that of the second light beam;
the wave plate unit is arranged on the light-emitting path of the first reflector, and the polarization direction of the first light beam emitted after passing through the wave plate unit is the same as that of the second light beam.
In one embodiment, the wave plate unit comprises a half-wave plate;
alternatively, the wave plate unit includes two quarter wave plates disposed in sequence.
In one embodiment, the polarization adjustment module comprises:
the second reflecting mirror is arranged on a first light path of the polarization beam splitter prism, the direction of the first light beam reflected by the second reflecting mirror is vertical to that of the second light beam, and the polarization direction of the first light beam reflected by the second reflecting mirror is the same as that of the second light beam;
and the third reflector is arranged on the light-emitting path of the second reflector, and the direction of the first light beam reflected by the third reflector is parallel to that of the second light beam.
In one embodiment, the first optical path and the second optical path are perpendicular to each other;
the direction of the first light path is the transmission direction of the polarization beam splitter prism, and the direction of the second light path is the reflection direction of the polarization beam splitter prism;
or the direction of the first optical path is the reflection direction of the polarization beam splitter prism, and the direction of the second optical path is the transmission direction of the polarization beam splitter prism.
In one embodiment, the laser module further comprises an optical fiber outlet end, the optical fiber outlet end is connected with the laser, and a laser beam generated by the laser is emitted to the polarization beam splitter prism through the optical fiber outlet end.
In one embodiment, the optical waveguide module comprises a grating and an optical waveguide, wherein the grating is arranged on the light incident surface of the optical waveguide;
the grating is used for adjusting the incidence angles of the first light beam and the second light beam, so that the first light beam and the second light beam which are incident to the optical waveguide after passing through the grating are coupled and transmitted in the optical waveguide.
In a second aspect, the present invention further provides a laser display device, which includes the laser display light source system described above.
The laser display light source system and the laser display equipment provided by the invention have the beneficial effects that at least: on one hand, the laser display light source system provided by the embodiment of the invention can adjust the polarization direction of the light beam by arranging the polarization adjusting module, so that the polarization directions of the two light beams emitted by the polarization adjusting module are the same, the laser generated by the laser source can be fully utilized, the light energy utilization rate is improved, and the light intensity is further improved. On the other hand, the laser display light source system that this embodiment provided can couple the back to the LCoS to the light beam of dispersing through setting up the optical waveguide module, has greatly reduced the spot size of outgoing, has effectively solved the problem of spot size grow, keeps higher light beam quality, improves laser display effect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a first schematic diagram of an optical path structure of a laser display light source system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an optical path structure of a laser display light source system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a light path structure of a laser display light source system according to an embodiment of the present invention;
fig. 4 is a fourth schematic view of an optical path structure of a laser display light source system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an optical path structure of a laser display light source system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an optical waveguide module in a laser display light source system according to an embodiment of the present invention.
Wherein, in the figures, the various reference numbers:
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In a laser display device using an LCoS as an optical modulator, the LCoS can normally work only when the incident light is linearly polarized light, and therefore a laser light source system capable of efficiently generating linearly polarized laser light is required. One way is to arrange a polarization beam splitter prism on the light emitting path of a laser light source, the LCoS is arranged on one light emitting path of the polarization beam splitter prism, after natural light passes through the polarization beam splitter prism, light with one polarization direction is emitted to the LCoS, and light with the other polarization direction is emitted along the other light emitting path. Although the linearly polarized laser meeting the LCoS requirement can be obtained in the mode, the light emitted along the other light emitting path is not utilized, so that the light is wasted, the utilization rate of the light is greatly reduced, the light energy is wasted, the light intensity is reduced, and the laser display effect is influenced.
The present embodiment proposes a novel laser display light source system, and specifically, the laser display light source system is shown in fig. 1. The laser display light source system 10 includes a laser module 11, a polarization splitting prism 12, a polarization adjustment module 13, and an optical waveguide module 14. The laser module 11 includes a laser for generating a laser beam. The polarization beam splitter prism 12 is arranged on the light-emitting path of the laser module 11, a laser beam generated by the laser is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along the first light path, and the second beam is emitted along the second light path. The polarization adjustment module 13 is disposed on the first optical path of the polarization splitting prism 12, and is configured to adjust the polarization direction of the first light beam to the second polarization direction. The optical waveguide module 14 is disposed on the light emitting paths of the first light beam and the second light beam, and configured to couple and emit the first light beam and the second light beam.
The number of the lasers can be one, or a plurality (including two), and can be set according to the needs. When the number of the lasers is plural, the types of the lasers may be the same or different. When the laser types are the same, the multiple lasers may be red, green, or blue lasers simultaneously. When the laser types are different, the laser module 11 may include a red laser, a green laser, and a blue laser. In this embodiment, it is considered that a laser beam emitted from one laser display light source system 10 needs to be irradiated onto one LCoS, and therefore, the same type of laser is preferably used in one laser display light source system 10.
The polarization beam splitter prism 12 can split the incident unpolarized light into two mutually perpendicular linearly polarized lights (P light and S light, corresponding to two different polarization directions), wherein the P light can directly exit through the polarization beam splitter prism, and the S light is reflected when passing through the polarization beam splitter prism and then exits along the direction perpendicular to the P light. In this embodiment, the first optical path may be an optical path for emitting S light, and the second optical path corresponds to an optical path for emitting P light; alternatively, the first optical path may be an optical path through which the P light exits, and the second optical path may correspond to an optical path through which the S light exits.
In order to fully utilize the laser beam generated by the laser light source, considering that the laser beam emitted to the LCoS needs to have the same linear polarization direction, the polarization adjustment module 13 is arranged in this embodiment to adjust the polarization direction of the first light beam emitted along the first light path, so that after the first light beam passes through the polarization adjustment module 13, the polarization direction of the first light beam is adjusted from the first polarization direction to the second polarization direction which is the same as the second light beam.
Compared with the situation of only using the light beam of the first light path or the second light path, the light beam of the first light path and the light beam of the second light path are simultaneously used in the embodiment, so that the size of the light spot is increased, and if the size of the light spot is not adjusted, the light beam can be fully used only by increasing the numerical aperture of the subsequent projection lens. In order to reduce the size of the light spot, the optical waveguide module 14 is further disposed in this embodiment, and the first light beam of the first optical path and the second light beam of the second optical path are both incident into the optical waveguide module 14, transmitted to the exit of the optical waveguide module 14, and emitted to the LCoS. Because the light beam is totally reflected in the optical waveguide module 14 without changing the polarization direction, the light beam is not lost when being transmitted in the optical waveguide module 14, and the size of the exit of the optical waveguide module 14 is not affected by the size of the light spot, so that the size of the light spot of the light beam can be greatly reduced.
On one hand, the laser display light source system 10 provided in this embodiment can adjust the polarization direction of the light beam by arranging the polarization adjustment module 13, so that the polarization directions of the two light beams emitted by the polarization adjustment module are the same, thereby fully utilizing the laser generated by the laser light source, improving the light energy utilization rate, and further improving the light intensity; on the other hand, the laser display light source system 10 that this embodiment provided can couple the back to the LCoS to the light beam of dispersing through setting up optical waveguide module 14, has greatly reduced the spot size of outgoing, has effectively solved the problem of spot size grow, keeps higher light beam quality, improves laser display effect.
Further, the emitting mode of the laser beam generated by the laser in the laser module 11 can be set according to the requirement. For example, the laser beam generated by the laser may be emitted directly to the polarization splitting prism 12. For another example, an optical fiber may be connected to the exit end of the laser, and the laser beam generated by the laser is transmitted to the polarization splitting prism 12 through the optical fiber. Because the energy distribution of the light beam generated by the common laser is usually Gaussian when the light beam directly exits, the central energy density of the light beam is large, and the energy density is lower when the light beam is farther away from the center, so that the central energy of the light beam is too concentrated, and the uniformity is poor. In this embodiment, the optical fiber is disposed at the exit end of the laser device, so that on one hand, the propagation path of the laser beam can be adjusted, and on the other hand, the energy distribution of the laser beam after being emitted through the optical fiber is changed and is not concentrated in the center of the laser beam, thereby adjusting the energy distribution of the laser beam.
Further, the specific structural form of the polarization adjustment module 13 can be set as required. For convenience of description, the first optical path is an optical path for emitting S light (the first light beam is S light), and the second optical path is an optical path for emitting P light (the second light beam is P light).
In an embodiment, referring to fig. 1, the polarization adjustment module 13 includes a wave plate unit 131 and a first reflector 132, the wave plate unit 131 and the first reflector 132 are disposed on the first light path of the polarization beam splitter 12, the first light beam emitted after passing through the wave plate unit 131 and the first reflector 132 is parallel to the second light beam, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The wave plate unit 131 is configured to adjust a polarization direction of the first light beam, so that the polarization direction of the first light beam is adjusted to be the same as the polarization direction of the second light beam. The specific form of the wave plate unit 131 can be set as required, for example, referring to fig. 1 and fig. 2, the wave plate unit 131 can include a half-wave plate, and the polarization direction of the first light beam rotates to be the same as the polarization direction of the second light beam after passing through the half-wave plate. The polarization direction of the first light beam can be adjusted through the half-wave plate, and the whole structure is simple. For another example, referring to fig. 3 and 4, the wave plate unit 131 may include two quarter wave plates sequentially disposed, where the two quarter wave plates are equivalent to a half wave plate, and the polarization direction of the first light beam is rotated to be the same as the polarization direction of the second light beam after passing through the two quarter wave plates. The present embodiment can also realize the adjustment of the polarization direction of the first light beam through the two half-wave plates, and has a simple structure and increased adjustability of the overall structure.
The first mirror 132 is arranged to adjust the propagation direction of the first light beam, and is preferably a 45 ° mirror (i.e. the incident angle of the first light beam is set to be 45 °), and the normal of the first mirror 132 is arranged coplanar with the plane where the first light beam and the second light beam are located, so as to ensure that the first light beam is parallel to the second light beam after passing through the first mirror 132.
The order in which the wave plate unit 131 and the first mirror 132 are disposed along the first optical path may be adjusted as necessary.
Referring to fig. 1, in one arrangement, the wave plate unit 131 and the first mirror 132 are sequentially disposed on the first optical path, that is: the wave plate unit 131 is disposed on the first light path of the polarization beam splitter 12, and the first reflector 132 is disposed on the light exit path of the wave plate unit 131. At this time, the first light beam is polarized by the wave plate unit 131 and then is propagated by the first reflector 132, so as to ensure that the first light beam is parallel to the second light beam after passing through the first reflector 132, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam. By adjusting the distance of the first reflecting mirror 132 with respect to the polarization splitting prism 12, the distance between the first light beam and the second light beam can be adjusted, and thus the size of the light spot can be adjusted.
Referring to fig. 2, in another arrangement, the first reflecting mirror 132 and the wave plate unit 131 are sequentially disposed on the first optical path, that is: the first reflector 132 is disposed on the first light path of the polarization beam splitter 12, and the wave plate unit 131 is disposed on the light emitting path of the first reflector 132. At this time, the first light beam is first adjusted in the propagation direction by the first reflector 132, and then adjusted in the polarization direction by the wave plate unit 131, so as to ensure that the propagation direction of the first light beam is parallel to the second light beam after passing through the first reflector 132, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam. By adjusting the distance of the first reflecting mirror 132 with respect to the polarization splitting prism 12, the distance between the first light beam and the second light beam can be adjusted, and thus the size of the light spot can be adjusted.
Referring to fig. 5, in one embodiment, the polarization adjustment module 13 includes a second mirror 133 and a third mirror 134. The second reflecting mirror 133 is disposed on the first light path of the polarization beam splitter 12, the direction of the first light beam reflected by the second reflecting mirror 133 is perpendicular to the direction of the second light beam, and the polarization direction of the first light beam reflected by the second reflecting mirror 133 is the same as the polarization direction of the second light beam. The third reflector 134 is disposed on the light-emitting path of the second reflector 133, and the first light beam reflected by the third reflector 134 is parallel to the second light beam.
Specifically, the second mirror 133 is preferably a 45 ° mirror, that is, the second mirror 133 is disposed such that the incident angle of the first light beam is 45 °, and the direction of the second light beam is perpendicular to the normal of the second mirror 133 and the plane of the first light beam, so that the first light beam is reflected by the second mirror 133 and then travels in a direction perpendicular to the second light beam, and the polarization direction of the first light beam is consistent with the polarization direction of the second light beam. The third reflector 134 is preferably a 45 ° reflector, that is, the third reflector 134 is disposed such that the incident angle of the first light beam reflected by the second reflector 133 is 45 °, and the direction of the second light beam is parallel to the normal of the third reflector 134 and the plane where the first light beam is located, so that the propagation direction of the first light beam reflected by the third reflector 134 is parallel to the second light beam, and the polarization direction of the first light beam is consistent with the polarization direction of the second light beam. This embodiment not only can realize the adjustment to the polarization direction and the propagation direction of first light beam through setting up two speculum for the polarization direction and the propagation direction of first light beam are unanimous with the second light beam, and the low cost of speculum has greatly reduced whole manufacturing cost moreover. Further, the present embodiment can adjust the distance between the first beam and the second beam by adjusting the distance of the second reflecting mirror 133 with respect to the polarization splitting prism 12 and adjusting the distance of the third reflecting mirror 134 with respect to the second reflecting mirror 133, so that the size of the light spot can be adjusted.
It should be understood that, the above-mentioned first optical path is taken as an optical path for emitting S light, and the second optical path is taken as an optical path for emitting P light, which is only for illustration and not for limiting the technical solution, and a light beam obtained after passing through the polarization splitting prism 12 and the polarization adjusting module 13 is P light and propagates along the direction of P light. Of course, the first optical path is taken as the P light emitting optical path, the second optical path is taken as the S light emitting optical path, and the light beam with the same propagation direction and polarization direction can also be obtained, and the light beam obtained after passing through the polarization splitting prism 12 and the polarization adjusting module 13 is the S light.
Further, the utilization ratio of light has been increased through the second light beam of polarization beam splitter prism 12 outgoing and the first light beam of outgoing after polarization adjustment module 13 adjustment, the area of facula has also been increased simultaneously, consider the same situation of first light beam and second light beam light volume, compare in the situation that only utilizes the second light beam, the facula area of this embodiment has increased 1 doubly, if direct with this facula outgoing to LCoS, then need the numerical aperture increase of LCoS, projection lens etc. just can make full use of light. In order to reduce the size of the light spot and meet the requirement of the numerical aperture of the LCoS and the projection lens, the optical waveguide module 14 is disposed on the light outgoing path of the first light beam and the second light beam in the embodiment, where the optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incoming surface of the optical waveguide 142. The grating 141 is configured to adjust incident angles of the first light beam and the second light beam, so that the first light beam and the second light beam incident to the optical waveguide 142 after passing through the grating 141 are coupled in the optical waveguide 142 and transmitted to the outlet of the optical waveguide 142.
In this embodiment, the specific form of the grating 141 can be set as required. For example, referring to fig. 6, the grating 141 may be a multilayer holographic grating, the multilayer holographic grating is stacked on the surface of the optical waveguide 142, each layer of grating may deflect the light beam, and after multiple deflections of the multilayer holographic grating, the incident angle of the incident light beam may be changed, so that the incident angle of the light beam incident on the optical waveguide 142 is smaller than the total reflection angle of the optical waveguide 142, and the light beam is totally reflected during the transmission process of the optical waveguide 142, thereby avoiding light loss. For another example, the grating 141 may be a surface relief grating, and the surface relief grating may be formed on the surface of the optical waveguide 142 by a photolithography technique, which helps to improve the integrity of the grating 141 and the optical waveguide 142. By adjusting the parameters of the multilayer holographic grating or the surface relief grating, the diffraction angle of the grating can be increased, so that the divergence angle of the light beam can be kept small, and the quality of the light beam is improved. For another example, the grating 141 may also be a PVG grating (polarizer grating), which not only can ensure that the incident angle of the light beam entering the optical waveguide 142 is smaller than the total reflection angle of the optical waveguide 142, but also has high diffraction efficiency and large diffraction angle, and can keep the divergence angle of the light beam smaller, and improve the quality of the light beam.
Further, referring to fig. 6, when the number of the lasers in the laser module 11 is multiple (for example, N is a positive integer), and the number of the light source systems is multiple, since the area of the light incident surface of the optical waveguide module 14 can be increased as required, and the size of the exit of the optical waveguide 142 can be kept unchanged, the light beams of the N lasers can be coupled into the same optical waveguide 142.
Specific examples of laser display light source systems are given below. It should be understood that the following embodiments are only for illustrating the laser display light source system and are not intended to limit the scope of protection.
Referring to fig. 1, a first embodiment:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is an S light-emitting light path, the second light path is a P light-emitting light path correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflector 132, the wave plate unit 131 includes a half-wave plate, the half-wave plate and the first reflector 132 are sequentially disposed on the first light path of the polarization beam splitter 12, the first light beam emitted after passing through the wave plate unit 131 and the first reflector 132 is parallel to the second light beam, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Please refer to fig. 2, example two:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is an S light-emitting light path, the second light path is a P light-emitting light path correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflection mirror 132, the wave plate unit 131 includes a half-wave plate, the first reflection mirror 132 and the half-wave plate are sequentially disposed on a first light path of the polarization beam splitter prism 12, a first light beam emitted after passing through the first reflection mirror 132 and the wave plate unit 131 is parallel to a second light beam, and a polarization direction of the first light beam is the same as a polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Please refer to fig. 3, a third embodiment:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is an S light-emitting light path, the second light path is a P light-emitting light path correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflector 132, the wave plate unit 131 includes two quarter wave plates, the two quarter wave plates and the first reflector 132 are sequentially disposed on the first light path of the polarization beam splitter 12, the first light beam emitted after passing through the wave plate unit 131 and the first reflector 132 is parallel to the second light beam, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Please refer to fig. 4, in a fourth embodiment:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is an S light-emitting light path, the second light path is a P light-emitting light path correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflector 132, the wave plate unit 131 includes two quarter wave plates, the first reflector 132 and the two quarter wave plates are sequentially disposed on the first light path of the polarization beam splitter prism 12, the first light beam emitted after passing through the wave plate unit 131 and the first reflector 132 is parallel to the second light beam, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Please refer to fig. 5, example five:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is an S light-emitting light path, the second light path is a P light-emitting light path correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a second reflecting mirror 133 and a third reflecting mirror 134, the second reflecting mirror 133 is disposed on the first light path of the polarization beam splitter 12, the direction of the first light beam reflected by the second reflecting mirror 133 is perpendicular to the direction of the second light beam, and the polarization direction of the first light beam reflected by the second reflecting mirror 133 is the same as the polarization direction of the second light beam; the third reflector 134 is disposed on the light-emitting path of the second reflector 133, and the first light beam reflected by the third reflector 134 is parallel to the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Example six:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is a light path for emitting P light, the second light path is a light path for emitting S light correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflection mirror 132, the wave plate unit 131 includes a half-wave plate, the half-wave plate and the first reflection mirror 132 are sequentially disposed on the first light path of the polarization splitting prism 12, the first light beam emitted after passing through the wave plate unit 131 and the first reflection mirror 132 is parallel to the second light beam, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Example seven:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is a light path for emitting P light, the second light path is a light path for emitting S light correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflector 132, the wave plate unit 131 includes a half-wave plate, the first reflector 132 and the half-wave plate are sequentially disposed on the first light path of the polarization beam splitter 12, the first light beam and the second light beam emitted after passing through the first reflector 132 and the wave plate unit 131 are parallel in direction, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Example eight:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is a light path for emitting P light, the second light path is a light path for emitting S light correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflector 132, the wave plate unit 131 includes two quarter wave plates, the two quarter wave plates and the first reflector 132 are sequentially disposed on the first light path of the polarization beam splitter 12, the first light beam emitted after passing through the wave plate unit 131 and the first reflector 132 is parallel to the second light beam, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Example nine:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is a light path for emitting P light, the second light path is a light path for emitting S light correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a wave plate unit 131 and a first reflector 132, the wave plate unit 131 includes two quarter wave plates, the first reflector 132 and the two quarter wave plates are sequentially disposed on the first light path of the polarization beam splitter 12, the first light beam emitted after passing through the wave plate unit 131 and the first reflector 132 is parallel to the second light beam, and the polarization direction of the first light beam is the same as the polarization direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
Example ten:
a laser display light source system 10 comprises a laser module 11, a polarization splitting prism 12, a polarization adjusting module 13 and an optical waveguide module 14.
The laser module 11 includes a laser for generating a laser beam.
The polarization beam splitter prism 12 is arranged on a light-emitting path of the laser module 11, the laser beam is divided into a first beam with a first polarization direction and a second beam with a second polarization direction after passing through the polarization beam splitter prism 12, the first beam is emitted along a first light path, the second beam is emitted along a second light path, the first light path is a light path for emitting P light, the second light path is a light path for emitting S light correspondingly, and the first light path and the second light path are perpendicular to each other.
The polarization adjustment module 13 includes a second reflecting mirror 133 and a third reflecting mirror 134, the second reflecting mirror 133 is disposed on the first light path of the polarization beam splitter 12, the direction of the first light beam reflected by the second reflecting mirror 133 is perpendicular to the direction of the second light beam, and the polarization direction of the first light beam reflected by the second reflecting mirror 133 is the same as the polarization direction of the second light beam; the third reflector 134 is disposed on the light emitting path of the second reflector 133, and the direction of the first light beam reflected by the third reflector 134 is parallel to the direction of the second light beam.
The optical waveguide module 14 includes a grating 141 and an optical waveguide 142, and the grating 141 is disposed on the light incident surface of the optical waveguide 142. The first and second light beams are incident into the optical waveguide 142 via the grating 141, coupled via the optical waveguide 142 and transmitted to the outlet thereof.
It is also an object of the present embodiment to provide a laser display device comprising at least one laser display light source system 10 as described above. The laser display device further comprises an LCoS, a prism and a projection lens. The number of the LCoS corresponds to the number of the laser display light source systems 10, and each laser display light source system 10 corresponds to one LCoS. In this embodiment, the number of the LCoS may be three, which are red light LCoS, green light LCoS and blue light LCoS, respectively, the number of the laser display light source system 10 is correspondingly three, and the lasers thereof are red light laser, green light laser and blue light laser, respectively. The prism is used for converging light beams reflected by the LCoS and then emitting the light beams to the projection lens, and the image is amplified to the display screen through the projection lens, so that laser display is realized.
The laser display device provided by the embodiment has the beneficial effects that: on one hand, the polarization adjusting module 13 arranged in the laser display light source system 10 of the laser display device can adjust the polarization direction of the light beam, so that the polarization directions of the two light beams emitted by the polarization adjusting module are the same, the laser generated by the laser source can be fully utilized, the light energy utilization rate is improved, and the light intensity is further improved; on the other hand, laser display light source system 10 of laser display equipment can couple the back emergence to LCoS to the light beam of dispersing through setting up optical waveguide module 14, has greatly reduced the spot size of emergence, has effectively solved the problem of spot size grow, keeps higher light beam quality, improves laser display effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A laser display light source system, comprising:
the laser module comprises a laser for generating a laser beam;
the laser module comprises a laser module, a polarization beam splitter prism, a first light source and a second light source, wherein the polarization beam splitter prism is arranged on a light outgoing path of the laser module, a laser beam is split into a first light beam with a first polarization direction and a second light beam with a second polarization direction after passing through the polarization beam splitter prism, the first light beam is emitted along a first light path, and the second light beam is emitted along a second light path;
the polarization adjusting module is arranged on a first light path of the polarization splitting prism and at least used for adjusting the polarization direction of the first light beam to be a second polarization direction;
the optical waveguide module is arranged on light outgoing paths of the first light beam and the second light beam and is used for coupling the first light beam and the second light beam and then emitting the coupled light beams;
the optical waveguide module comprises a grating and an optical waveguide, the grating is arranged on a light incoming surface of the optical waveguide, the light incoming surface is arranged on the side surface of the optical waveguide, the grating is used for adjusting the incident angles of the first light beam and the second light beam so that the first light beam and the second light beam which are incident to the optical waveguide after passing through the grating are coupled in the optical waveguide and transmitted to an outlet of the optical waveguide, and the outlet is arranged at the end part of the optical waveguide to reduce the size of a light spot;
the polarization adjustment module comprises:
the second reflecting mirror is arranged on a first light path of the polarization beam splitter prism, the direction of the first light beam reflected by the second reflecting mirror is vertical to that of the second light beam, and the polarization direction of the first light beam reflected by the second reflecting mirror is the same as that of the second light beam;
and the third reflector is arranged on the light-emitting path of the second reflector, and the direction of the first light beam reflected by the third reflector is parallel to that of the second light beam.
2. The laser display light source system of claim 1, wherein the first light path and the second light path are perpendicular to each other;
the direction of the first light path is the transmission direction of the polarization beam splitter prism, and the direction of the second light path is the reflection direction of the polarization beam splitter prism;
or the direction of the first light path is the reflection direction of the polarization beam splitter prism, and the direction of the second light path is the transmission direction of the polarization beam splitter prism.
3. The laser display light source system of claim 1, wherein the laser module further comprises an optical fiber exit end, the optical fiber exit end is connected to the laser, and a laser beam generated by the laser exits to the polarization splitting prism through the optical fiber exit end.
4. A laser display device, characterized in that the laser display device comprises a laser display light source system according to any one of claims 1-3.
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| CN202111307969X | 2021-11-05 | ||
| CN202111307969.XA CN114200760A (en) | 2021-11-05 | 2021-11-05 | Laser display light source system and laser display equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4822150A (en) * | 1987-05-18 | 1989-04-18 | Eastman Kodak Company | Optical device for rotating the polarization of a light beam |
| US5995284A (en) * | 1996-03-29 | 1999-11-30 | 3M Innovative Properties Company | Polarized illumination system for LCD projector |
| JP3697013B2 (en) * | 1997-02-19 | 2005-09-21 | キヤノン株式会社 | Illumination device and projection device using the same |
| TW380213B (en) * | 1999-01-21 | 2000-01-21 | Ind Tech Res Inst | Illumination apparatus and image projection apparatus includes the same |
| TW200632508A (en) * | 2005-02-09 | 2006-09-16 | Wavien Inc | Etendue efficient combination of multiple light sources |
| CN201233470Y (en) * | 2008-07-08 | 2009-05-06 | 杭州远方光电信息有限公司 | Polarization eliminating reflection lens |
| CN101923223B (en) * | 2009-06-12 | 2012-09-05 | 深圳市绎立锐光科技开发有限公司 | Polarized light source, polarization conversion method and device thereof, and application system |
| CN102004321A (en) * | 2010-08-27 | 2011-04-06 | 浙江金成科技发展有限公司 | Optical structure of LED liquid crystal projector with single polarization converter |
| KR20150118789A (en) * | 2014-04-15 | 2015-10-23 | 엘지전자 주식회사 | Image projection apparatus |
| CN106842605B (en) * | 2017-04-11 | 2023-05-12 | 合肥全色光显科技有限公司 | Light splitting device based on polarization spectroscope |
| US10642031B2 (en) * | 2018-05-03 | 2020-05-05 | Texas Instruments Incorporated | Expanding a pupil using replication via beam splitter feeding a waveguide |
| CN110794644B (en) * | 2018-08-03 | 2023-02-24 | 扬明光学股份有限公司 | Optical device and method for manufacturing the same |
| CN110161680A (en) * | 2019-05-10 | 2019-08-23 | 北京理工大学 | A kind of holographical wave guide display device and its display methods |
| CN213690209U (en) * | 2020-12-23 | 2021-07-13 | 杭州光粒科技有限公司 | Projection optical machine and projection display equipment |
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