CN216595871U

CN216595871U - Three-color laser light source and laser projection equipment

Info

Publication number: CN216595871U
Application number: CN202122306032.2U
Authority: CN
Inventors: 颜珂; 田有良
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-09-06
Filing date: 2021-09-23
Publication date: 2022-05-24
Anticipated expiration: 2031-09-23
Also published as: CN113777868A

Abstract

The application discloses a three-color laser light source, which comprises a first laser, a second laser, a light combination component, a condensing lens and a reflection-type light-homogenizing component, wherein the first laser is used for emitting laser light; the first laser and the second laser are vertically arranged and are used for emitting three-color laser; the first light combination area of the light combination component transmits a first laser beam emitted by the first laser and reflects a second laser beam emitted by the second laser, and the second light combination area of the light combination component transmits a third laser beam emitted by the first laser and reflects a fourth laser beam emitted by the second laser; the light combination component emits the three-color light combination beam to the condensing lens and the reflection type light uniformization component, and the reflection type light uniformization component is used for outputting the three-color laser after reflecting for multiple times. The application also discloses laser projection equipment applying the three-color laser light source.

Description

Three-color laser light source and laser projection equipment

Technical Field

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

Background

With the development of display technology, the requirements for the display effect of the projection picture of the laser projection device are higher and higher.

The laser source has the advantages of good monochromaticity, high brightness, long service life and the like, and is an ideal light source. With the increase of the power of laser devices, the requirements of industrial applications are met, and the lasers are also gradually used as light sources for illumination. For example, in recent years, a laser is used as a projection light source in a projection apparatus, instead of a mercury lamp, and the laser also has advantages of a small etendue and high luminance as compared with an LED light source.

Most of laser projection light sources appearing in the industry at present are mixed laser light sources of monochromatic laser (blue laser) and fluorescence, the fluorescence is obtained by exciting a wavelength conversion device by blue laser, the commonly used wavelength conversion device is a fluorescence wheel, and the projection light sources including the wavelength conversion device have the defects that the brightness improvement is limited by the conversion efficiency of the wavelength conversion device, the number of optical components is increased, and the volume of the light sources is usually larger.

Disclosure of Invention

The embodiment of the application provides a three-color laser light source on the one hand, and realizes the compactness and miniaturization of the light source while realizing the high brightness and high color gamut output of three colors.

The following technical scheme is adopted:

a three-color laser light source comprises a first laser, a second laser, a light combination component, a condensing lens and a reflection-type light-homogenizing component;

the first laser and the second laser are vertically arranged and emit three-color laser;

the light combination assembly comprises a first light combination area and a second light combination area, the first light combination area transmits a first laser beam emitted by the first laser and reflects a second laser beam emitted by the second laser, and the second light combination area transmits a third laser beam emitted by the first laser and reflects a fourth laser beam emitted by the second laser;

the first light combining area and the second light combining area emit three-color laser light;

the condensing lens is used for receiving and condensing the three-color laser emitted by the first light combination area and the second light combination area to the reflection-type light-homogenizing component;

the reflection-type dodging component is used for outputting three-color laser after reflecting for multiple times.

The three-color laser light source comprises a first laser, a second laser, a light combination component and a fly eye lens;

the fly-eye lens is used for homogenizing the three-color laser and outputting the homogenized three-color laser.

Also, an embodiment of the present application further provides a laser projection apparatus, including:

the laser light source is used for emitting light to the light valve, the light valve is used for modulating incident light and then irradiating the modulated incident light to the lens, and the lens is used for projecting the incident light; the laser light source adopts the laser light source scheme.

In the technical scheme that this application provided, first laser instrument and second laser instrument vertical arrangement all send the tristimulus designation laser to just accomplish the light that closes of tristimulus designation laser beam through once closing light, the light source light path is compact, easily miniaturization.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1-1 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 1-2 are schematic structural diagrams of an optical engine according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a laser light source according to an embodiment of the present disclosure;

fig. 3 is a schematic view of another laser light source provided in the embodiment of the present application;

fig. 4 is a schematic diagram of a laser projection optical path according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a further laser projection optical path provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a light spot emitted by a laser unit according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a light combining assembly according to an embodiment of the present disclosure;

fig. 8 is a schematic view of an ultra-short-focus laser projection apparatus according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

First, the technical scheme of the application is applied to laser projection equipment. Fig. 1-1 illustrate an example of a laser projection device, and fig. 1-2 illustrate an example of a laser projection optical engine. The structure and operation of the laser projection apparatus of the present embodiment will be described first with reference to the example of the laser projection apparatus shown in fig. 1-1.

As shown in fig. 1-1, the laser projection apparatus 00 includes a casing 011 and a base 012, the casing 011 and the base 012 form an accommodating space, and in the accommodating space, the laser projection apparatus further includes an optical engine structure mounted on the base 012, as shown in fig. 1-2, the laser projection apparatus includes a light source 100, an optical engine 200, and a lens 300, and these three optical parts are connected in sequence along a light beam propagation direction. Each of the three major portions has a corresponding housing to enclose the optical components and to provide a hermetic seal or seal to each optical portion.

The accommodating space formed by the complete machine shell 011 and the base 012 also comprises a plurality of circuit boards 400, the circuit boards 400 are parallel to each other, and the inner side of the complete machine shell 011 is vertically arranged on the base 012.

In one embodiment, referring to fig. 1-1 and fig. 1-2, the optical engine 200 and the lens 300 are connected and disposed along a first direction of the whole machine, for example, the first direction may be a width direction of the whole machine, or according to a use mode, the first direction is opposite to a direction viewed by a user, and a connection direction of the light source 10 and the optical engine 20 is perpendicular to the first direction, so that an optical engine portion composed of the light source 100, the optical engine 200, and the lens 300 is connected in an "L" shape. The optical machine is positioned at the corner position of the L shape. So that the optical axis makes a 90 degree turn, and the length of the optical path in one direction is compressed.

Referring to fig. 1-1, the plurality of circuit boards 400 include a power supply board, also referred to as a power supply board, for providing power to a plurality of modules of the device; the display board card is mainly used for controlling the imaging of the projection system, and in the embodiment, the display board card is a DLP system, such as the generation of a DMD chip signal, the output of a light source time sequence signal and a PWM brightness dimming signal, and the like; the signal transmission board card, also called TV board, is mainly used to decode the video signal and then form an image signal to be transmitted to the display board card for further image processing.

The light source 100 is a three-color laser light source, and the three-color laser light source in the following embodiments is applied.

Fig. 2 is a schematic structural diagram of a laser light source according to an embodiment of the present application. The laser light source may include: the optical engine comprises a first laser 10, a second laser 12, a light combining component 20, a condensing lens 30, and a light homogenizing part 40, wherein in some embodiments, the light homogenizing part 40 is disposed in the optical engine 200 shown in fig. 1-2.

The first laser 10 and the second laser 20 are vertically arranged and are used for emitting red, green and blue laser light.

The light combining component 20 is located at the light emitting side of the first laser 10 and the second laser 12, and is configured to receive the laser beams emitted from different areas of the first laser 10 and the second laser 12 through different light receiving areas, respectively.

As shown in fig. 7, the light combining component 20 includes a first light combining area 21 and a second light combining area 22.

In an example, the first light combining region 21 is configured to transmit a first laser beam emitted by the first laser 10 and reflect a second laser beam emitted by the second laser, and the second light combining region 22 is configured to transmit a third laser beam emitted by the first laser 10 and reflect a fourth laser beam emitted by the second laser 12, so that, by combining light in the above manner, three-color laser light can be emitted from both the first light combining region 21 and the second light combining region 22, and when the first laser 10 and the second laser 12 emit light simultaneously, both the first light combining region 21 and the second light combining region 22 can emit combined light of the three-color laser light, that is, white light. When the first laser 10 and the second laser 12 alternately emit light, the first light combining area 21 and the second light combining area 22 can emit laser beams of three primary colors of red, green and blue in a time sequence.

As shown in fig. 2, the condensing lens 30 is a condensing lens for receiving and condensing the three-color laser beams emitted through the first light combining region 21 and the second light combining region 22, and emitting the laser beams in a condensed state to the reflective dodging member 40, and the reflective dodging member 40 may be a hollow or solid optical rod having a certain length for homogenizing the energy of the optical beam by reflecting the optical beam multiple times inside.

In this example, each of the first laser 10 and the second laser 12 may have a plurality of laser units (not shown in fig. 2) arranged in an array, and the plurality of laser units may include: the laser system comprises a red laser unit for emitting red laser light, a green laser unit for emitting green laser light, and a blue laser unit for emitting blue laser light. For example, the plurality of laser units are arrayed in four rows, and the four rows of laser units may include: two rows of red laser units for emitting red laser light, one row of green laser units for emitting green laser light, and one row of blue laser units for emitting blue laser light. In this way, the first laser 10 can emit red laser light, green laser light, and blue laser light simultaneously by the red laser unit, the green laser unit, and the blue laser unit; the second laser 12 can simultaneously emit red, green and blue laser lights through the red, green and blue laser units.

It should be noted that the embodiments in the present application are schematically illustrated by taking as an example that the first laser 10 and the second laser 12 simultaneously emit laser light of three colors, namely, blue laser light, green laser light, and red laser light. The structure of the second laser 12 in the embodiment of the present application may be the same as that of the first laser 10. In other possible implementations, the first laser 10 and the second laser 12 may also emit laser light of two colors, blue laser light and yellow laser light, simultaneously. The embodiment of the present application does not limit this.

In the present application, each of the plurality of laser units may include one light emitting chip, that is, each of the first laser 10 and the second laser 12 may include a plurality of light emitting chips arranged in an array, and each row of the plurality of light emitting chips is configured to emit laser light of the same color. For example, the first laser 10 includes light emitting chips arranged in four rows and six columns, where one row of the light emitting chips is used to emit blue laser, one row of the light emitting chips is used to emit green laser, and the other two rows of the light emitting chips are used to emit red laser; the second laser 12 includes light emitting chips arranged in four rows and six columns, where one row of the light emitting chips is used for emitting blue laser, one row of the light emitting chips is used for emitting green laser, and the other two rows of the light emitting chips are used for emitting red laser. In other possible implementation manners, the plurality of light emitting chips may also be arranged in other arrangement manners, which is not limited in this application embodiment.

Fig. 4 shows an example of an optical path including another laser light source. The same as in the example of fig. 2 is that the spatial arrangement between the first laser 10, the second laser 12 and the light combining component may be the same. The difference is that the laser beams combined by the first light combining region 21 and the second light combining region 22 of the light combining component are both incident on the fly eye lens 60. Fly-eye lens 60 is used to homogenize the received laser beam.

Fly-eye lens 60 is composed of a glass substrate, and microlenses on the light incident surface and the light exiting surface of the glass substrate. The fly-eye lens is thinner than the optical rod along the light beam propagation direction, so that the fly-eye lens is small in size and beneficial to miniaturization of the whole optical system. The size of the light spot emitted from the fly-eye lens is large, and the light spot needs to be shaped by matching with a subsequent illumination system.

As shown in fig. 4, there is an illuminating mirror group 80 between the fly-eye lens 60 and the light valve 90, and the illuminating mirror group 80 is used to reshape the angle and size of the light spot homogenized by the fly-eye lens 60 and make the light spot incident on the surface of the light valve 90, in this example, the light valve 90 is a DMD digital micromirror array.

The laser is linearly polarized light, and is divided into P-linearly polarized light and S-linearly polarized light according to the difference of the light emitting principle, which will be referred to as P light and S light hereinafter. When the laser light source is applied to a micro-projection system, a projection image is projected to a screen, a curtain or a rough wall surface, and generally, the rough medium surface has no particular selectivity on the polarization state of laser light. Therefore, the different polarization states of the laser light source do not need to be processed. When the laser light source is used with an ultra-short-focus optical screen, the optical screen is composed of multiple layers of microstructures, and has polarization selectivity according to the material. For example, a fresnel optical panel has a higher transmittance for P light than S light, thereby exhibiting selectivity for P light, which may be visible light in any wavelength range. Therefore, in order to improve the brightness of the projection screen and improve the system light efficiency, the linearly polarized light of different polarization states in the laser light source can be preferably changed into a uniform polarization state.

Referring to fig. 4, a first wave plate 72 and a second wave plate 71 are disposed facing part of the light emitting surfaces of the first laser 10 and the second laser 12, respectively. The first laser 10 emits red, green and blue laser beams, wherein the emitted blue and green laser beams pass through the second wave plate 72, the second wave plate 72 is a half-wave plate, and after passing through the half-wave plate, the blue and green laser beams are converted into a P polarization state from an original S polarization state.

Similarly, the second laser 12 emits red, green, and blue laser beams, wherein the emitted blue and green laser beams pass through the first wave plate 71, the first wave plate 71 is a half-wave plate, and after passing through the half-wave plate, the S polarized light emitted by the second laser 12 is also converted into P polarized light. The red laser beams emitted by the first laser 10 and the second laser 12 are both P-polarized light, and after passing through the first wave plate 71 and the second wave plate 72, the three-color laser beams emitted by the lasers are both P-polarized light.

And laser has strong correlation, and forms speckle effect when imaging. The speckle effect causes the picture to generate graininess, and reduces the quality of the projected picture. The laser is in Gaussian energy distribution, when the light beams of different luminous points are combined, the energy distribution of the light combining light spot can be more uniform through the light homogenizing component, and the speckle effect can also be improved to a certain extent. According to the principle of decoherence or speckle elimination, the energy distribution of the laser beam is about uniform and is changed from a Gaussian type to a smooth type, and the speckle effect can be greatly reduced or eliminated. In this example, the energy distribution of the laser light can be improved by increasing the divergence angle of the laser light beam by providing a diffusion sheet member in the light source structure.

Referring to fig. 3, a first diffusion 51 and a second diffusion 52 are added to the optical path of the laser light source shown in fig. 2. The second diffusion part 52 is disposed between the condensing lens 30 and the reflection-type light-homogenizing member 40, and the second diffusion part 52 is a rotating diffusion sheet, and can diffuse the laser beam in a condensed state, increase the diffusion angle, and homogenize the light spot to a certain extent. The first diffusion part 51 is positioned between the light combination component 20 and the condensing lens 30, and is used for primarily homogenizing the light spots after light combination, the first diffusion part 51 is fixedly arranged, the number of random phases in the laser beam can be effectively increased through the arrangement of a diffusion sheet combination with dynamic and static combination, the randomness of speckle spot patterns is also increased, and therefore the speckle granular sensation in the visual perception of human eyes can be reduced.

In some miniaturized examples, only the second diffusion portion 52 in a motion state may be provided in the light source architecture shown in fig. 3. The second diffusion portion 52 may be rotatable or two-dimensionally translatable, and is not limited herein.

Referring to fig. 5, on the basis of the laser light source shown in fig. 4, a small-angle diffuser, i.e., a third diffuser 53, may be further disposed between the light combining assembly and the fly-eye lens 60, so as to homogenize the three-color light spots after light combining and then perform secondary homogenization through the fly-eye lens.

Referring to fig. 6, fig. 6 is a schematic diagram of a light spot formed by the laser unit according to the embodiment of the present application.

In one example, the light emitting surfaces of the first laser 10 and the second laser 12 may be both as shown in fig. 6.

For example, the laser units in the first laser 10 and the second laser 12 emit rectangular laser spots, wherein the lasers with different colors are arranged in rows, which facilitates dividing the laser beams with different colors into regions.

In the following, the laser beam homogenization is performed by taking fig. 4 as an example, and the laser beams emitted by each of the above-mentioned lasers form a three-color light-combined spot. The light incident surface and the light emitting surface of the fly-eye lens 60 are formed by arranging a plurality of microlenses in a matrix. The light spot formed by the light combining laser beam on the light incident surface of the fly-eye lens 60 overlaps with the region where the at least two micro lenses are located at the light incident surface. In this case, since the size of the microlens provided on the light incident surface of the fly-eye lens 60 is small, the spot formed on the light incident surface of the fly-eye lens 60 by the combined laser beam can correspond to at least two microlenses. Therefore, the effect of homogenizing each part of the synthetic laser beam by the fly-eye lens 60 is good.

In another embodiment, the light spots formed by the combined laser beam on the light incident surface of the fly-eye lens 60 may overlap with regions where at least four microlenses arranged on the light incident surface of the fly-eye lens 60 are located, and the at least four microlenses are arranged in at least two rows and two columns in an array. For example, when the light spot formed by the laser unit on the light incident surface of the fly-eye lens 60 overlaps with the region where the four microlenses are located, the four microlenses may be arranged in two rows and two columns. In this way, the effect of homogenizing the laser beams emitted from the respective laser units by the fly-eye lens 60 can be further improved.

In the present embodiment, the sizes of the respective microlenses in the fly-eye lens 60 are the same. For example, the width of the microlens in the fast axis direction and the width in the slow axis direction are both in the range of 0.1 mm to 1 mm.

In the examples of fig. 2 to 5, the light combining component 20 includes the first light combining region 21 and the second light combining region 22 as shown in fig. 7, and in the examples, the first light combining region 21 and the second light combining region 22 combine light by wavelength selection characteristics. The light combination assembly can comprise a transparent substrate, and a first light combination area and a second light combination area are formed on the lens substrate through coating. The above-mentioned plating film may be a plating film having different wavelength selective characteristics. Alternatively, the light combining component can be formed by splicing two dichroic plates with different wavelength selection characteristics.

In one example, the first laser beam emitted by the first laser 10 and the second laser beam emitted by the second laser 12 have different wavelength ranges, and one of the first laser beam and the second laser beam may be a red laser beam, and the other of the first laser beam and the second laser beam may include a blue laser beam and a green laser beam.

When the first laser beam is red laser and the second laser beam is blue and green laser, the first light combining region 21 can selectively transmit the red light band and reflect light outside the red light band or reflect only the blue light band and the green light band through the film layer or the coating or the wafer, so that the red laser can be transmitted and the blue laser and the green laser can be reflected. When the first laser beam is blue and green laser and the second laser beam is red laser, the first light combining region 21 selectively transmits the blue wavelength band and the green wavelength band to reflect the light before the wavelength bands or reflects only the red wavelength band through the film layer.

And the wavelength ranges of the third laser beam emitted by the first laser 10 and the fourth laser beam emitted by the second laser 12 are different. One of the third laser beam and the fourth laser beam is red laser, and the other laser beam comprises blue laser and green laser. Similarly to the arrangement manner of the first light combining region 21, the second light combining region 22 may also realize transmission of one of the third laser beam and the fourth laser beam and reflection of the other through arrangement of a wavelength selective film or coating or a wafer. In addition, the first light combining area and the second light combining area correspond to different light emitting areas of the same laser, and the colors of the laser beams emitted by the different light emitting areas are different, so that the wavelength selection characteristics of the first light combining area and the second light combining area are opposite.

In one example, the first light combining region transmits the red laser light emitted by the first laser, the second light combining region transmits the blue and green laser light emitted by the first laser, and the first light combining region reflects the blue and green laser light emitted by the second laser, and the second light combining region reflects the red laser light emitted by the second laser.

In another example, when the polarization states of some laser beams of the first laser 10 and the second laser 12 are not converted, that is, two laser beams with different polarization states are emitted from the original laser, the different light combining areas of the light combining component 20 can also combine light through the polarization selection characteristic, and thus the light combining component may be a polarizer with the polarization selection characteristic. For example, the red laser is P light, and the blue and green laser is S light, the first light combining area 21 and the second light combining area 22 of the light combining component have different polarization selection characteristics.

One of the first laser beam emitted by the first laser 10 and the second laser beam emitted by the second laser is P light, and the other is S light, and both of them are incident on the first light combining area 21 together, and when the first laser beam is red laser and the second laser beam is blue and green laser, the first light combining area 21 transmits P light and reflects S light, so that the red laser is transmitted through the first light combining area, and the blue and green laser is reflected by the other surface of the first light combining area.

And one of the third laser beam emitted by the first laser 10 and the fourth laser beam emitted by the second laser 12 is S light, and the other is P light, and both of them are incident on the second light combining area 22. When the first laser beam is a red laser and the second laser beam is a blue laser and a green laser, the third laser beam is a blue laser and a green laser in an S-polarization state, the fourth laser beam is a red laser in a P-polarization state, and the second light combining region 22 can transmit the S light and reflect the P light, so that the third laser beam transmits through the second light combining region, and the fourth laser beam is reflected by the other surface of the second light combining region, thereby finally completing the light combining of the four laser beams emitted by the two groups of lasers.

When the light combining component combines light by polarization, referring to fig. 7 again, the first light combining region 21 and the second light combining region 22 are polarizers with different polarity selections, respectively.

When the wave plate is arranged at the light-emitting surface of the laser, light cannot be combined through the polarization selection characteristic, and only the wavelength light combination mode can be selected.

In the laser light source or the laser projection optical path system of the above-mentioned multiple embodiments, set up two sets of lasers that all send three-colour laser beam through vertical arrangement to set up one and close the optical subassembly in the crossing light path position that two sets of lasers exit beam, just accomplish the light that closes of two sets of three-colour lasers, compare and close the light through a plurality of dichroic filters among the prior art, the light path is short, and the light path is compact, does benefit to and realizes that the laser light source is miniaturized.

The following embodiments of the present application provide a laser projection apparatus, and a display effect of a projection screen of the laser projection apparatus may be better. The laser projection apparatus can also be miniaturized relatively easily.

Referring to fig. 5 and 5, which are schematic diagrams illustrating a laser projection light path, three-color laser light obtained by combining light of a first laser 10 and a second laser 12 is homogenized by a fly eye lens 60, shaped by an illuminating mirror group 80, and incident to a light valve 90, and the light valve 90 transmits a modulated light beam to a projection lens 001 through a prism 92, so as to amplify the projection light beam, and finally projects the projection light beam to a screen for imaging.

The light valve in the embodiment of the present application may be modified adaptively according to the projection architecture of the laser projection apparatus. Illustratively, the light valve may be a Liquid Crystal On Silicon (LCOS), a Liquid Crystal Display (LCD), or a Digital Micromirror Device (DMD). In the embodiment of the present application, a Digital Light Processing (DLP) architecture is adopted for a laser projection device, and a DMD is used as an example for the Light valve for explanation. Illustratively, the DMD includes a plurality of tiny reflective sheets (not shown), each of which can be regarded as a pixel, and the light reflected by each of the reflective sheets can be used to display a pixel point in a projected picture. The reflector plate can be in two states, the reflector plate can reflect incident light to the lens in the first state, and the reflector plate can reflect the incident light to the outside of the lens in the second state, so that bright and dark display of pixels is realized. For example, the reflective sheet may be in the first state when rotated by plus 17 degrees or plus 12 degrees from the initial state, and the reflective sheet may be in the second state when rotated by minus 17 degrees or minus 12 degrees from the initial state. For example, if the light valve shown in fig. 8 represents a reflective sheet, the reflective sheet may be in the first state at this time, and the initial state of the reflective sheet may be a state in which the reflective sheet is parallel to the side of the first prism L1 adjacent thereto. If the angle of clockwise rotation of the reflection sheet from the initial state is positive, the angle of counterclockwise rotation from the initial state is negative. Therefore, the laser projection equipment can project a corresponding projection picture by adjusting the state of each reflecting sheet in the DMD.

Fig. 1-2 are schematic structural diagrams of an optical engine of a laser projection apparatus according to an embodiment of the present disclosure. Fig. 1-2 show an overall appearance of an optical engine of a laser projection device, which may be an overall appearance of an optical engine of a laser projection device of any of the alternative configurations in the above-described embodiments. As shown in fig. 1-2, the laser projection apparatus includes: a light source 10, a light engine 20 and a lens 30. The light source 10 is configured to emit light to the optical engine 20, the optical engine 20 is configured to modulate the incident light and emit the modulated light to the lens 30, and the lens 30 is configured to project the incident light. For example, the light source 10 may include any one of the embodiments of the laser light source described above with reference to fig. 2 to 3 and modifications thereof. Alternatively, the optical engine optical path may be the laser projection optical path system shown in fig. 4 or fig. 5 and the modified version thereof, and has the beneficial effects of the laser light source or the laser projection optical path, which are not described herein again.

Fig. 8 is a schematic structural diagram of an ultra-short-focus laser projection apparatus according to an embodiment of the present application.

As shown in fig. 8, the laser projection apparatus 00 is disposed close to the projection screen, and emits an image beam obliquely upward to the projection screen for imaging. The laser projection apparatus 00 may include the laser light source shown in fig. 2 or fig. 3 and its modified example, or include the laser projection optical path system shown in fig. 4 or fig. 5 and its modified example, and have the beneficial effects of the laser light source or the laser projection optical path, which are not described herein again.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship. The term "A, B and at least one of C" in this application means that there may be seven relationships that may mean: seven cases of A alone, B alone, C alone, A and B together, A and C together, C and B together, and A, B and C together exist. In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A three-color laser light source is characterized by comprising a first laser, a second laser, a light combination component, a condensing lens and a reflection type light uniformizing component;

the first laser and the second laser are vertically arranged and are used for emitting three-color laser;

the condenser lens is used for receiving and converging the three-color laser emitted by the first light combination area and the second light combination area to the reflection-type light-homogenizing component;

the reflection-type dodging component is used for outputting the three-color laser after multiple reflections.

2. The laser light source according to claim 1, further comprising a first diffusing portion provided between the condenser lens and the light entrance of the reflective dodging member, the first diffusing portion being in a moving state.

3. A three-color laser light source is characterized by comprising a first laser, a second laser, a light combination component and a fly eye lens;

the fly-eye lens is used for homogenizing the three-color laser and then outputting the homogenized three-color laser.

4. The laser light source of claim 1 or 3, wherein the light combining assembly comprises a transparent substrate, and the first light combining area and the second light combining area are formed on the transparent substrate by plating.

5. The laser light source according to claim 1 or 3, wherein the first light combining region and the second light combining region are dichroic plates having different wavelength selective characteristics, respectively.

6. The laser light source according to claim 1 or 3, wherein the first light combining region and the second light combining region are polarizers having different polarization selection characteristics, respectively.

7. The laser light source according to claim 1 or 3, wherein one of the first laser beam and the second laser beam is a red laser and the other is a blue and green laser;

and one of the third laser beam and the fourth laser beam is red laser, and the other is blue and green laser.

8. The laser light source according to claim 1 or 3, wherein one of the first laser beam and the second laser beam is a P-beam and the other is an S-beam;

and one of the third laser beam and the fourth laser beam is S light, and the other is P light.

9. The laser light source according to claim 3, further comprising a third diffusion portion provided between the light combining member and the fly-eye lens.

10. A laser projection device, comprising:

the laser light source is used for emitting light to the light valve, the light valve is used for modulating incident light and then emitting the modulated light to the lens, and the lens is used for projecting the incident light; the laser light source is the laser light source according to any one of claims 1 to 9.