CN110928120B - Laser array, laser light source and laser projection equipment - Google Patents
Laser array, laser light source and laser projection equipment Download PDFInfo
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- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
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- 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
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Abstract
The invention discloses a laser array, a laser light source and laser projection equipment, and belongs to the technical field of laser display. The laser array comprises a light emitting part, a light transmitting part and a light receiving part, wherein the light emitting part is used for emitting laser beams, and the light transmitting part is arranged along the light emitting direction of the light emitting part and used for transmitting the laser beams; the light transmission part comprises a first light transmission area and a second light transmission area, and the light beams transmitted through the two areas from the light emitting part have different polarization directions due to the arrangement of the first light transmission area and the second light transmission area, so that the coherence of laser beams emitted by the laser array can be reduced, and speckle dissipation is facilitated.
Description
Technical Field
The present invention relates to the field of laser display technologies, and in particular, to a laser array, a related laser light source, and a related laser projection device.
Background
In recent years, laser light has been increasingly used as a light source in the field of projection display technology. But due to the high coherence of the laser, a speckle effect is inevitably generated. When a rough object is irradiated by a coherent light source, scattered light has the same wavelength and a constant phase, so that interference occurs in space, interference constructive occurs in some parts in space, interference destructive occurs in some parts, and finally, granular speckles with alternate brightness appear at a display end, thereby degrading the quality of a projected image.
Fig. 1 shows a schematic structure of a laser array in the prior art, wherein the laser array comprises a metal bracket 01, a plurality of grooves 02 are formed on the metal bracket 01, a laser light emitting chip 012 and a collimating lens 011 are contained in each groove 02, and the laser light emitting chip 012 and the collimating lens 011 shown in fig. 1 are packaged together and contained in the grooves 02. The laser beam emitted by the laser array enters the light path, is converged, shaped and the like, irradiates to the light modulation device in the optical machine, and is emitted after modulation. In general, when using the laser array as a light source, it is necessary to provide a speckle removing element in the optical path to mitigate the speckle effect.
In order to reduce the speckle effect of the laser due to the characteristics of the laser itself, the related art includes using a rotating diffusion sheet or a vibrating diffusion sheet in the laser transmission path, or increasing the spatial phase of the laser by providing a diffusion member to destroy the interference condition of constant phase for reducing the speckle. Still other methods are to weaken the influence of speckle by vibrating an optical fiber, vibrating a screen and the like, but are limited by application scenes and cost, for example, the optical fiber is usually used together with a coupling lens, and to achieve a better speckle dissipation effect, the size is usually larger, and the method is unfavorable for household use, and the vibrating screen needs to be additionally provided with a driving circuit, so that the driving control is difficult and the cost is higher along with the increase of the size of the screen.
The conventional speckle eliminating scheme is generally based on adding speckle eliminating elements in a transmission light path of laser, so that the complexity of the light path is increased, the speckle eliminating effect is also related to the light processing efficiency of the light path design, and the problem of speckle eliminating of the whole optical system is greatly restricted.
Disclosure of Invention
In order to solve the technical problem of speckle of laser projection display, the invention provides a laser array which is applied to a laser light source, can emit laser beams with lower coherence and is beneficial to reducing the speckle effect during laser projection display.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a laser array, comprising:
the light emitting part is used for emitting laser beams, and a light transmitting part is arranged along the light emitting direction of the light emitting part and used for transmitting the laser beams; the light transmitting part comprises a first light transmitting area and a second light transmitting area, and the first light transmitting area and the second light transmitting area are arranged so that light beams transmitted through the two areas from the light emitting part have different polarization directions;
preferably, the first light-transmitting region and the second light-transmitting region are arranged such that the polarization directions of the light beams transmitted through the two regions from the light-emitting portion are orthogonal; or alternatively, the process may be performed,
the first light-transmitting region and the second light-transmitting region are arranged such that the light beams transmitted through the two regions from the light-emitting portion are linearly polarized light and circularly polarized light, respectively; or the laser beam emitted by the light-emitting chip is respectively linearly polarized light and circularly polarized light after passing through the first light-transmitting area and the second light-transmitting area;
preferably, the light transmission part comprises a window bracket, the first light transmission area and the second light transmission area respectively comprise a plurality of first light transmission units, the second light transmission unit and a plurality of first light transmission units, and the second light transmission units are adhered to the window bracket; the curvature of the first light transmission unit and the curvature of the second light transmission unit are zero; or the light-transmitting part comprises a light-transmitting glass plate, and a first light-transmitting area and a second light-transmitting area are formed by regional coating on the light-transmitting glass plate;
preferably, the first light transmitting unit and the second light transmitting unit are arranged in a row or column interval.
Alternatively, each first light-transmitting unit and each second light-transmitting unit are adjacently arranged;
preferably, one of the first light transmission area and the second light transmission area is flat glass or a diffusion sheet, and the other is a half-wave sheet or a quarter-wave sheet;
preferably, the light emitting device further comprises a collimation part, wherein the collimation part comprises a plurality of collimation lens units, and the number of the collimation lens units is consistent with that of the light emitting chips;
preferably, the light emitting chips are arranged in a row-column array;
preferably, the color of the light beam emitted by the light emitting chip is one of blue, green and red;
or the color of the light beam emitted by the light-emitting chip is any two of blue, green and red;
alternatively, the light emitting chip emits blue laser, red laser, and green laser.
The invention also provides a laser light source comprising the laser array.
The invention also provides laser projection equipment, which comprises the laser light source.
The first light-transmitting area and the second light-transmitting area of the light-transmitting part have different transmission treatments for laser beams, one area can allow the laser to emit according to the original polarization direction, and the other area can change the polarization direction of the laser beams, so that when the laser light-emitting chip penetrates the light-transmitting part, mixed beams of the laser beams with different polarization directions can be formed, the laser beams with different polarization directions are mixed and output, the coherence between the laser beams is reduced, and therefore, the laser beams with low coherence can be provided, and the speckle effect when the rear end performs laser projection display is reduced.
The laser light source and the laser projection equipment provided by the invention also have the beneficial technical effects, and the low-coherence laser beam can also reduce or simplify the use of the speckle dissipation component in the optical path, thereby being beneficial to the reduction of the complexity of the whole optical path architecture and the miniaturization of the laser light source and the laser projection equipment.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a prior art laser array;
FIG. 2A is a schematic cross-sectional view of a laser array according to an embodiment of the present invention;
FIG. 2B is a schematic cross-sectional view of another laser array according to an embodiment of the present invention;
FIG. 3A is a schematic cross-sectional view of the light emitting portion of the laser array of FIG. 2A;
FIG. 3B is a schematic front view of the light transmitting portion of the laser array of FIG. 2A;
FIGS. 4A,4B,4C,4D are schematic diagrams illustrating the arrangement of the light-transmitting portions according to the embodiments of the present invention;
FIG. 5 is a schematic cross-sectional view of an assembled structure of a laser array according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an arrangement manner of the collimating part in the embodiment of the present invention.
FIG. 7A is a schematic front view of a laser array according to an embodiment of the present invention;
FIG. 7B is a schematic front view of a laser array according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a laser source according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a laser projection device according to an embodiment of the present invention;
fig. 10a and 10b are schematic diagrams illustrating a change in polarization direction of a laser beam according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment 1,
An embodiment of the present invention provides a laser array, referring to fig. 2A, fig. 2A is a schematic cross-sectional view of the laser array in the embodiment of the present invention, where the laser array includes a light emitting portion 021 for emitting a laser beam, and a light transmitting portion 022 disposed along a light emitting direction of the light emitting portion 021 for transmitting the laser beam. Specifically, referring to fig. 3A, the light emitting part 021 includes a light emitting chip 0211, a metal substrate 0212, and the light emitting chip is fixedly connected to the metal substrate 0212. The light emitting chip 0211 emits a laser beam under electric drive, wherein the laser beam may be linearly polarized light.
And, the light transmitting portion 022 includes a first light transmitting region and a second light transmitting region, wherein the first light transmitting region and the second light transmitting region are disposed such that light beams transmitted through the two regions from the light emitting portion 022 have different polarization directions, and in one embodiment, the first light transmitting region and the second light transmitting region of the light transmitting portion 022 are disposed such that polarization directions of light beams transmitted through the two regions from the light emitting portion 021 are orthogonal, or in another embodiment, the first light transmitting region and the second light transmitting region are disposed such that light beams transmitted through the two regions from the light emitting portion 021 are linearly polarized light and circularly polarized light, respectively.
Referring to fig. 2A, the light-transmitting portion 22 is a light-transmitting layer structure, and covers the light-emitting side of the laser beam of the light-emitting portion 021, and in an embodiment, as shown in fig. 3B, the light-transmitting portion 022 includes a window frame 0221, and a plurality of hollow windows 0222 are formed on the window frame 0221, and are used for adhesively accommodating a plurality of light-transmitting units. In a specific implementation, the light transmission unit is a light transmission component, has zero curvature and is used for transmitting the laser beam without generating convergence and collimation effects on the laser beam.
Specifically, a plurality of light transmitting units (not shown) may be adhered to the window frame 0221 by UV glass cement curing, and the plurality of light transmitting units are divided into two areas according to whether the polarity of the transmitted laser light is changed or not: the first light-transmitting area and the second light-transmitting area. The polarization directions of the laser beams emitted by the light emitting portion 021 after passing through the first light transmitting region and the second light transmitting region are different, for example, as shown in fig. 10A, the original linear polarization is changed into circular polarization, the polarization direction is changed, or as shown in fig. 10B, the original linear polarization direction is changed into another polarization direction perpendicular to the original polarization direction, assuming that the laser beam passing through the first light transmitting region is P light, the laser beam passing through the second light transmitting region is S light, the polarization directions of the two are in 90-degree inversion relationship, and the polarities are perpendicular to each other.
In one embodiment, one of the first light-transmitting area and the second light-transmitting area adopts flat glass, and the other adopts a quarter wave plate, so that after the laser beam passes through the first light-transmitting area and the second light-transmitting area, one of the laser beams still keeps the original linear polarization direction, and after the other laser beam passes through the quarter wave plate, the linear polarization light vertically enters the quarter wave plate, and the polarization direction of the linear polarization light forms an angle of 45 degrees with the optical axis of the wave plate, so that circular polarization is generated, the situation shown in fig. 10A is formed, the circular polarization has a plurality of polarization directions, the coherence between the light beams with different polarization directions is reduced, and the laser array can emit the laser beam with low coherence, so that the speckle effect in the rear-end laser projection display is reduced.
In another embodiment, one of the first light-transmitting area and the second light-transmitting area adopts flat glass, and the other adopts half wave plate, so that after the laser beam penetrates through the first light-transmitting area and the second light-transmitting area, one of the laser beams still keeps the original linear polarization direction, and after the other one passes through the half wave plate, the polarization direction is turned over by 90 degrees, polarized light with different polarities from the original laser beam is emitted, so that the situation shown in fig. 10B is formed, two lasers with mutually perpendicular polarization directions can be converted between P light and S light, and when the two lasers enter the same scattering element (a speckle dissipation component), superposition of two independent random patterns can be generated, thereby being beneficial to reducing speckle effect, and two laser beams with the same frequency and different polarization directions can be considered to be incoherent, so that the coherence of the laser beams emitted by the laser array is reduced to a great extent, and the speckle effect is beneficial to be weakened or eliminated.
In one embodiment, according to the number of panes contained in the first light-transmitting area and the second light-transmitting area, a plurality of flat glass plates, half wave plates or quarter wave plate elements are arranged and respectively adhered to the window of the window bracket of the light-transmitting part, and the window is opposite to the emergent light beam of each laser light-emitting chip, and the light-transmitting part is a pane-shaped light-transmitting structure.
In another embodiment, the light-transmitting portion is an integral light-transmitting structure, such as a light-transmitting glass plate, and the transmission characteristics of different areas are realized through the split-area coating, for example, the polarization direction can be changed through the partial coating, so that the first light-transmitting area and the second light-transmitting area are formed. The position of the specific coating can be determined according to the polarization direction change requirement of the laser beam.
In another embodiment, the nonpolar conversion element may be made of a diffusion sheet material other than flat glass, so that the laser beam can be homogenized while passing through the diffusion sheet.
In one embodiment, a plurality of light-transmitting units are adhered to the window 0221 to form a pane-shaped light-transmitting layer structure, as shown in a schematic cross-section of a laser array package structure in fig. 5, a light-transmitting portion of the light-transmitting layer structure is covered on a light-emitting direction of a light-emitting chip, an edge portion of the light-transmitting portion can be fixed to a metal substrate by welding or gluing, specifically, the window bracket and the metal substrate can be fixed by resistance welding, so as to form a sealed space, and the light-emitting chip is contained in the sealed space to protect the light-emitting chip and prevent dust and isolate. Optionally, nitrogen is filled in the sealed space, so that the oxidation of the light-emitting chip can be further prevented, and the performance and the service life of the laser are improved.
The first light-transmitting area and the second light-transmitting area of the light-transmitting portion respectively include a plurality of first light-transmitting units and second light-transmitting units, and the plurality of first light-transmitting units and the second light-transmitting units are adhered in a window 0222 formed by the window support 0221. In one embodiment, in the laser array, the number of the plurality of light emitting chips is identical to the sum of the number of the plurality of first light transmitting units and the number of the plurality of second light transmitting units, that is, the light beam emitted by each laser light emitting chip corresponds to one light transmitting unit and is transmitted through the light transmitting unit. For example, when the laser array includes 20 lasers, that is, includes 20 light emitting chips, the sum of the number of the first light transmitting units and the number of the second light transmitting units is also 20, and each of the first light transmitting units or the second light transmitting units faces the light emitting direction of one of the light emitting chips.
Of course, the light beams emitted by the plurality of laser light emitting chips may be incident to the light transmitting units, that is, the division of the first light transmitting units and the second light transmitting units is inconsistent with the number of the laser light emitting chips, for example, when the laser array includes 20 light emitting chips, the number of the first light transmitting units may be set to 5, and the number of the second light transmitting units may be set to 5, so that 10 light transmitting units are altogether, so that the laser light beams emitted by each two laser light emitting chips may be incident to one light transmitting unit.
When the total number of the light transmitting units is consistent with the total number of the laser light emitting chips, a plurality of laser beams with different polarization directions can be divided more finely, so that the laser beams are mixed more uniformly, and the coherence is reduced more favorably.
Next, an arrangement structure of the light transmitting units of the light transmitting portion will be described in detail with reference to examples given in fig. 4a,4b,4c,4 d. For simplicity, the laser array includes 20 laser light emitting chips, and is described in terms of an array arrangement of 4×5.
As illustrated in fig. 4A, the light-transmitting portion 22 includes a plurality of first light-transmitting units 0222a, which are indicated by filled vertical lines, the plurality of light-transmitting units 0222a constituting a first light-transmitting region, and a plurality of second light-transmitting units 0222b, which are indicated by blank squares, the plurality of light-transmitting units 0222b constituting a second light-transmitting region. In the example of fig. 4A, the laser light emitting chips (not shown) are arranged in an array to emit P light, where, illustratively, the first light transmitting unit 0222a is a half-wave plate, the second light transmitting unit 0222b is a flat glass, after passing through the first light transmitting area formed by the plurality of first light transmitting units 0222a, the polarity of the plurality of laser beams emitted by the light emitting unit is turned over from 90 degrees to S light, and after passing through the second light transmitting area formed by the plurality of second light transmitting units 0222b, the polarity of the laser beams is not changed by the flat glass, so that the P light is still obtained, that is, after passing through the first light transmitting area and the second light transmitting area, the polarization directions of the laser beams emitted by the light emitting unit are different and are perpendicular to each other.
Wherein the flat glass and the half wave plate may be of the same size. The thickness of the flat glass or half-wave plate may be selected to be between 0.5mm and 2mm, for example, about 0.7 mm.
Taking the arrangement shown in fig. 4A as an example, the plurality of first light-transmitting units and the plurality of second light-transmitting units may be arranged at intervals, where the first light-transmitting area includes two rows of first light-transmitting units, the second light-transmitting area includes two rows of second light-transmitting units, the laser beam still maintains the original polarity after transmitting the first light-transmitting area, for example, P light, and the polarity is turned over by 90 degrees after the laser beam transmits the second light-transmitting area, and the P light and the S light in the laser beams emitted from the laser array are arranged at intervals, so that the mixed light of the P light and the S light is the light with different polarities, and the simultaneous emission of the light beams is favorable for reducing the coherence of the light beams.
In practical applications, preferably, when the number of the arranged rows of the laser array is even, the first light-transmitting unit and the second light-transmitting unit are arranged at a row interval, so that the amounts of the outgoing P light and the outgoing S light are equivalent, and the decoherence effect is better, because according to the definition of the speckle contrast:
Whereas for two orthogonal beams of different polarization directions, which are incident on the same type of scattering element (speckle reduction device), separate speckle patterns are generated, each pattern being one of the two orthogonal polarization components. According to the above formula, if the two independent speckle patterns are of equal intensity, then n=2, and the speckle contrast will be reduced to 1/. V2, resulting in better speckle dissipation.
Taking the arrangement shown in fig. 4A as an example, the polarities of the laser beams in the first row and the second row are different, the polarization directions are mutually perpendicular, the polarities of the laser beams in the second row and the third row are also different, the polarization directions are mutually perpendicular, and the same holds true for the third row and the fourth row, so that the polarities of the two light beams emitted by the four rows of light emitting chips are opposite, and according to the description of the influence of the polarized light on speckle contrast, the laser array provided by the embodiment can emit laser beams with lower coherence, and achieves better speckle dissipation effect when being applied to projection display.
Alternatively, as shown in fig. 4B, the plurality of first light-transmitting units 0222a and the plurality of second light-transmitting units 0222B may be arranged at intervals, and the first light-transmitting area includes three rows of first light-transmitting units 0222a, such as a flat sheet 8 The second light-transmitting area includes two rows of second light-transmitting units 0222b, such as half-wave plates, the laser beams still keep the original polarity after transmitting through the first light-transmitting units of the first light-transmitting area, such as P light, and the polarity is turned over by 90 degrees after transmitting through the second light-transmitting units of the second light-transmitting area, the original P light is changed into S light, so that the P light and the S light in the laser beams emitted by the laser array are arranged at intervals, and are mixed light of the P light and the S light, and if the light-emitting intensity of each laser light-emitting chip is the same, the difference is different from the situation shown in fig. 4A, and the light intensity of the P light and the S light with different polarities at this time is a certain difference, and the light intensity of the P light is no longer equal to that of the S light. The effect of such decoherence is slightly lower than the situation shown in fig. 4A. Of course, the power of the laser light-emitting chip can be adjusted to make the light intensity of the P light and the S light equal, so that a better speckle dissipation effect can be obtained.
In order to obtain the speckle contrast value as small as possible, on the premise of not changing the luminous power of the laser luminous chip, the luminous intensity of two kinds of light with different polarization directions is equivalent as much as possible, and preferably, when the number of rows or columns of the laser array is even, the first light transmission unit and the second light transmission unit are arranged at intervals of rows or columns.
Fig. 4C shows an example of arrangement of light transmitting units of a further light transmitting portion. The first light transmitting units 0222a and the second light transmitting units 0222b are arranged in a checkerboard manner, namely, the first light transmitting units and the second light transmitting units are adjacent to each other, when the laser light emitting chips are arranged in rows and columns of 4x5, the first light transmitting units are 10, the second light transmitting units are also 10, the laser light emitting chips emit P light, the first light transmitting units 0222a are flat glass, when the second light transmitting units 0222b are half wave plates, the light beams transmitted by the laser light emitting chips through the first row light transmitting units are P light, S light, P light, S light and P light, the light beams transmitted by the second row light transmitting units are S light, P light, S light and S light, the third row is the same as the first row, the fourth row is the same as the second row, through the arrangement, the P light and the S light transmitting beams are adjacent to each other, the mixing is more uniform, the total light intensity is equivalent, and therefore the beam coherence effect after the adjacent light emitting chips pass through the light transmitting parts is reduced, and the laser projection display is facilitated to be reduced.
In yet another embodiment, when the laser light emitting chips are not arranged in regular rows and columns, such as in the case shown in fig. 4D, the laser light emitting chips can be arranged more compactly, which is advantageous for reducing the volume. Wherein the first light transmitting units are shown in the square pattern, and the second light transmitting units are shown in diagonal hatching, preferably, the first light transmitting units and the second light transmitting units are arranged adjacently. Therefore, laser beams with different polarization directions can be emitted from the light transmission units which are adjacent as far as possible, and the distribution of the P light and the S light is distributed uniformly, so that the light intensities of the P light and the S light are equivalent, and the mixing homogenization degree is higher.
Based on the above-mentioned allocation principle, it can be understood by those skilled in the art that, when the number of rows or columns is preferably even, the first light-transmitting units and the second light-transmitting units are arranged at intervals of rows or columns, and when the arrangement of the laser light-emitting chips is not regular row-column arrangement, the two light-transmitting units are arranged in a mode of adjacent two first light-transmitting units and second light-transmitting units, so that the number of the two light-transmitting units is equal as much as possible.
In summary, in the arrangements of the light-transmitting portions illustrated in fig. 4A to 4D, since different areas of the light-transmitting portions have different processing manners for the laser beams, one area may allow the laser beam to emit according to the original polarization direction, and the other area may change the polarization direction of the laser beam, so when the laser light-emitting chip transmits the light-transmitting portion to form a mixed beam of the laser beams with different polarization directions, and the polarization directions are different, two laser beams with corresponding light intensities have a large probability to form a plurality of independent speckle patterns, which is beneficial to resolving speckles, so that the coherence of the laser beams emitted by the laser array is reduced.
In the above example, the first light-transmitting unit may be a quarter-wave plate, and the second light-transmitting unit may be a flat glass or a diffusion plate. The laser beam is changed from linear polarized light to circular polarized light after passing through the first light transmission unit, and the laser beam is still in the original linear polarization direction after passing through the second light transmission unit, so that the laser beam emitted from one laser array comprises a plurality of polarization directions, and the coherence between the laser beams is reduced to a certain extent.
It should be noted that, the first light transmitting unit, the first light transmitting area, the second light transmitting unit, the second light transmitting area, and the laser light emitting chip in the above examples emit P light, and S light or circularly polarized light do not limit the laser array, but only illustrate one specific embodiment. And, in implementation, those skilled in the art will understand that the choice of materials for the first light-transmitting unit and the second light-transmitting unit is not limited to the example of the present embodiment, and the two may be interchanged.
In practical application, as the divergence angles of the laser beams emitted by the laser light emitting chip in the fast axis and the slow axis are different, the actual laser beams are in a relatively larger divergence state in the fast axis direction, such as 30 degrees divergence, and the slow axis has a divergence angle of only 8-10 degrees, so that the laser array component is expected to emit relatively parallel beams theoretically, the beams emitted by the laser light emitting chip also need to be collimated, and the collimated beams are emitted in a basically parallel state, which is beneficial to the design of a following light path. In one implementation, the microlens may be directly disposed above the laser light emitting chip as a collimating lens, and then sealed and packaged, for example, the outermost layer of the laser array is disposed with a light-transmitting layer and is hermetically connected to the metal substrate, so that the light emitting chip and the microlens are accommodated in the sealed space.
Referring to fig. 2B, a collimating part 023 is disposed on the light emitting side of the light transmitting part 022, and the collimating part 023 is a collimating lens group, and is composed of a plurality of lens unit structures, and is capable of collimating and converging light beams.
Referring to fig. 6, the collimating lens group includes a plurality of collimating lens units 0231, and the number of the plurality of collimating lens units 0231 is identical to the number of the light emitting chips or the number of the light transmitting units of the light transmitting part, that is, one collimating lens unit corresponds to one light transmitting unit of the light transmitting part and also corresponds to one light emitting chip, and is used for collimating the laser beam emitted by the corresponding light emitting chip and transmitted through the first light transmitting unit or the second light transmitting unit. The collimating lens group is arranged in the light emitting direction of the laser beam. In practical applications, the plurality of collimating lens units may be arranged in an array, such as a fly-eye lens array.
Optionally, the collimating lens group may be integrally formed into a single body, so as to cover the light emitting direction of the light emitting chip or the light emitting direction of the reflecting portion; each collimating lens group can be separately arranged and independently covered in the light emitting direction of the light emitting chip or the light emitting direction of the reflecting part. The material of the collimating lens group can be B270 and K9, and the optical glass material with high light transmittance and higher hardness can be selected.
Referring to fig. 5, a schematic structure diagram of a laser array package is shown, and a collimation portion 053 is further disposed at the outermost side of the laser array, specifically, the collimation portion 053 is a fly eye lens array. The peripheral edge portion of the collimating part 053 is adhered to the peripheral edge portion of the light transmitting part 052 or the metal substrate 0512 through UV glue, so as to form a packaged laser array. After the encapsulation, the light emitting chip (not shown) is enclosed in a sealed space formed by the light transmitting portion 052 and the metal substrate 0512. And pins 0514 are led out from the side of the metal substrate.
In one embodiment, the light emitting chip may be directly soldered to the metal substrate by soldering tin, or as shown in fig. 3A, the light emitting chip 0211 may be further connected to the metal substrate 0212 by a heat sink 0213, the light emitting chip 0211 is first fixedly connected to one side of the heat sink 0213 by soldering or heat conducting adhesive bonding, and the other side of the heat sink is then fixedly connected to the metal substrate 0212 by soldering or heat conducting adhesive bonding.
The connection mode of the light emitting chip and the metal substrate is not particularly limited, and may be a welding mode or a bonding mode of heat conducting glue, so long as the connection mode is ensured not to greatly influence heat conduction.
Each light emitting chip may be connected in series by an electrical connection, and in particular, each light emitting chip may be connected with a gold wire, which is finally connected to a Pin (Pin) to achieve energization of each light emitting chip. Alternatively, the wires may be fixed to the metal substrate by means of gluing.
In one embodiment, the metal substrate in the laser array is preferably a copper substrate, and has good heat conduction performance and a thickness in the range of 1mm to 3 mm.
In one embodiment, the light beams emitted by the light emitting chips in the laser array may be blue, green, or red; or one part of the light-emitting chips can emit blue light, and the other part of the light-emitting chips can emit red light or green light; a part of the light emitting chips can emit blue light, a part of the light emitting chips emit red light, and a part of the light emitting chips emit green light.
In one embodiment of the present invention, if a plurality of light emitting chips emit light of the same color, whether blue, red or green, the wavelengths of light beams emitted by adjacent light emitting chips in the plurality of light emitting chips are different, that is, there is a certain wavelength difference. By adopting the design scheme, the time coherence influence between adjacent laser beams can be greatly reduced, and the speckle influence of laser display is reduced. The wavelength difference is preferably at least 1nm in this embodiment, and more preferably 2nm.
When the light emitting chip emits blue laser and red laser, the light emitting chip emitting blue laser and the light emitting chip emitting red laser are consistent with the arrangement rule of the first light transmission unit and the second light transmission unit. Thus, blue laser and red laser have different wavelengths and polarization polarities, and the speckle is dissipated from two dimensions of time coherence and space coherence.
As shown in fig. 7A, a schematic view of a light emitting surface structure of a dual-color laser array is shown, where a red laser light emitting chip and a blue light emitting chip may be arranged adjacent to each other, a first light transmitting unit and a second light transmitting unit are respectively covered on the light emitting surfaces of the blue laser light emitting chip and the red laser light emitting chip and are also arranged at intervals from each other, the first light transmitting unit is a half-wave plate, the second light transmitting unit is a flat glass, the first light transmitting units of the first row and the third row normally transmit blue laser light, respectively, and the second light transmitting units of the second row and the fourth row transmit red laser light with polarity inverted.
Of course, the red laser light emitting chips and the blue laser light emitting chips may be arranged at intervals of rows or columns, for example, the first row and the third row may be arranged as the blue laser light emitting chips, the second row and the fourth row may be arranged as the red laser light emitting chips, and the first light transmitting unit and the second light transmitting unit may be arranged not according to rows or columns but according to two adjacent checkerboards, so that a plurality of laser beams with different wavelengths, different polarities, and possibly different polarities even if the wavelengths are the same may be obtained, and thus the speckle contrast of the laser beams with the polarization direction may be reduced, and a better speckle dissipation effect may be obtained.
As shown in fig. 7B, a schematic view of a light emitting surface structure of a three-color laser array is shown, where among a plurality of light emitting chips arranged in an array, three-color laser light emitting chips including red, green and blue are included, where a first row and a second row are blue laser light emitting chips, a third row is red laser light emitting chip, and a fourth row is green laser light emitting chip, where the first row and the third row are provided with a first light transmitting unit, and the second row and the fourth row are provided with a second light transmitting unit, so that blue laser transmitted by the first row and the second row have different polarities, blue laser transmitted by the second row light transmitting unit has different polarities from red laser transmitted by the third row, and red laser transmitted by the third row light transmitting unit has different polarities from green laser transmitted by the fourth row light transmitting unit, so that the whole laser array can emit multiple laser beams with different wavelengths and different polarities.
The polychromatic laser array in the above embodiment can emit laser beams with different wavelengths and different polarities, and can reduce the speckle effect of the laser beams based on the principle of reducing the speckle contrast with the polarized light, which is not described herein.
Embodiment II,
The invention also provides a laser light source, as shown in fig. 8, comprising a laser array 801 and a converging and shaping component 802, wherein the converging and shaping component 802 converges and shapes the laser beam emitted by the laser array 801 to form an illumination beam, and the illumination beam is homogenized by a light homogenizing part 803 and then is incident into a light machine. The light homogenizing part 803 may be a light guide or a fly eye lens. The shaped laser beam may be further passed through a moving diffuser wheel, diffuser plate, or phase adjustment device, for example, to dissipate the spots before entering the homogenizing unit 803, or after being homogenized by the homogenizing unit 803.
The laser array 801 in this embodiment may be any laser array example of the embodiment, and by adopting the laser array, the coherence characteristic or the speckle effect of the laser beam can be suppressed from the source, a high-quality illumination beam is provided, and more importantly, the use of the speckle dissipating component in the optical path can be greatly simplified, the optical path architecture is simplified, and miniaturization is facilitated.
Third embodiment,
The invention also provides a laser projection device, as shown in fig. 9, which comprises a laser light source 901, a light modulation device 902 and a projection lens 903, wherein the laser light source 901 emits a laser beam to form an illumination beam to be irradiated onto the light modulation device 902, specifically, the illumination beam is irradiated onto the light modulation device 902, in a DLP architecture, the light modulation device 902 can be specifically a DMD digital micromirror array, and comprises millions of micro mirrors, the light modulation device 902 modulates the illumination beam according to a driving signal corresponding to an image display signal, and the modulated beam enters the projection lens to be imaged, wherein the laser light source is the laser light source in the embodiment. The laser projection device provided in this embodiment may be a laser projector or a laser projection television, in which the laser source can improve a high-quality illumination beam, reduce a speckle effect, and facilitate simplification of an optical architecture, so as to achieve miniaturization of the laser projection device.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The laser array is characterized by comprising a light-emitting part, wherein the light-emitting part comprises a plurality of light-emitting chips arranged on a metal substrate and used for emitting laser beams, and the light-emitting chips are arranged in a row-column array; a light transmission part is arranged along the light emitting direction of the light emitting part and is used for transmitting the laser beam; a collimating lens group is arranged on the light-emitting side of the light-transmitting part and consists of a plurality of collimating lens unit structures, and one collimating lens unit corresponds to one light-emitting chip;
the light-transmitting part and the metal substrate are enclosed to form a sealed space, a plurality of light-emitting chips are positioned in the sealed space,
the light-transmitting part comprises a first light-transmitting area and a second light-transmitting area, and the first light-transmitting area and the second light-transmitting area are arranged so that light beams transmitted through the two areas from the light-emitting part have different polarization directions;
the first light-transmitting area and the second light-transmitting area respectively comprise a plurality of first light-transmitting units and second light-transmitting units;
each first light transmission unit or each second light transmission unit at least corresponds to one light emitting chip;
one of the first light transmission unit and the second light transmission unit is a plate glass or a diffusion sheet, and the other one is a half-wave sheet or a quarter-wave sheet.
2. The laser array according to claim 1, wherein when one of the first light transmitting unit and the second light transmitting unit is a plate glass or a diffusion sheet and the other is a half wave plate, the first light transmitting region and the second light transmitting region are arranged such that polarization directions of light beams transmitted through both regions from the light emitting portion are orthogonal.
3. The laser array according to claim 1, wherein when one of the first light transmitting unit and the second light transmitting unit is a plate glass or a diffusion sheet and the other is a quarter wave plate, the first light transmitting region and the second light transmitting region are arranged such that light beams transmitted through the two regions from the light emitting portion are linearly polarized light and circularly polarized light, respectively.
4. The laser array of claim 1 wherein the light transmissive portion comprises a window bracket, the plurality of first light transmissive units and second light transmissive units are each bonded to the window bracket; wherein the curvature of the first light transmission unit and the curvature of the second light transmission unit are zero; or alternatively, the process may be performed,
the light-transmitting part comprises a light-transmitting glass plate, and the first light-transmitting area and the second light-transmitting area are formed by regional coating on the light-transmitting glass plate.
5. The laser array of claim 4 wherein the first light transmissive cells and the second light transmissive cells are arranged in a row or column spacing.
6. The laser array of claim 4 wherein each of the first light transmissive elements and each of the second light transmissive elements are arranged adjacent to each other.
7. The laser array of claim 1, wherein the light beam emitted by the light emitting chip has one of blue, green, and red;
or the color of the light beam emitted by the light-emitting chip is any two of blue, green and red;
or the light-emitting chip emits blue laser, red laser and green laser.
8. A laser source, comprising the laser array of any one of claims 1-7, and a converging and shaping component, wherein the converging and shaping component converges and shapes a laser beam emitted by the laser array to form an illumination beam.
9. The laser projection device is characterized by comprising a laser light source, a light modulation device and a projection lens, wherein the laser light source emits laser light beams to form illumination light beams to be irradiated to the light modulation device, the light modulation device modulates the illumination light beams according to driving signals corresponding to image display signals, and the modulated light beams enter the projection lens to be imaged, and the laser light source is the laser light source of claim 8.
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| CN201811095997.8A CN110928120B (en) | 2018-09-19 | 2018-09-19 | Laser array, laser light source and laser projection equipment |
| CN202310939354.1A CN117111391A (en) | 2018-09-19 | 2018-09-19 | Laser array, laser light source and laser projection equipment |
| PCT/CN2019/084117 WO2020057124A1 (en) | 2018-09-19 | 2019-04-24 | Laser array, laser light source and laser projection device |
| US16/708,406 US11467477B2 (en) | 2018-09-19 | 2019-12-09 | Laser array, laser source and laser projection device |
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| CN110928123A (en) * | 2018-09-19 | 2020-03-27 | 青岛海信激光显示股份有限公司 | Laser array, laser light source and laser projection equipment |
| CN113589322A (en) * | 2021-07-06 | 2021-11-02 | 太原理工大学 | VCSEL linear array for multi-line laser radar |
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