CN110928119A - 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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- CN110928119A CN110928119A CN201811095967.7A CN201811095967A CN110928119A CN 110928119 A CN110928119 A CN 110928119A CN 201811095967 A CN201811095967 A CN 201811095967A CN 110928119 A CN110928119 A CN 110928119A
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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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
- G03B21/2013—Plural light sources
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
- Projection Apparatus (AREA)
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 chip arranged on the metal substrate and used for emitting laser beams, a sealing part is arranged along the light-emitting direction and used for enclosing with the metal substrate to form a sealing space, and the light-emitting chip is sealed in the sealing space; the sealing part comprises a first light transmission area and a second light transmission area, wherein the first light transmission area and the second light transmission area are arranged, so that light beams transmitted through the two areas from the light emitting part have different polarization directions, the coherence of laser beams emitted by the laser array can be reduced, and speckle elimination is facilitated.
Description
Technical Field
The invention relates to the technical field of laser display, in particular to a laser array and a related laser light source and laser projection equipment.
Background
In recent years, lasers have been increasingly used as light sources in the field of projection display technology. However, due to the high coherence of the laser light, the speckle effect is inevitably generated. Speckle is that when a coherent light source irradiates a rough object, scattered light has the same wavelength and a constant phase, so that interference occurs in space, some parts in the space interfere constructively, some parts interfere destructively, and finally granular light and dark spots appear at a display end, so that the quality of a projected image is reduced.
Fig. 1 shows a schematic structural diagram of a laser array in the prior art, which includes a metal support 01, the metal support 01 is formed with a plurality of grooves 02, each groove 02 accommodates a laser light emitting chip 012 and a collimating lens 011, and the laser light emitting chip 012 and the collimating lens 011 shown in fig. 1 are packaged together and accommodated in the groove 02. Laser beams emitted by the laser array enter a light path, are irradiated to a light modulation device in the optical machine through convergence, shaping and the like, and are emitted after modulation. When the laser array is used as a light source, an anti-speckle element is required to be arranged in the light path to reduce the speckle effect.
In order to reduce the speckle effect of laser light due to the characteristics of the laser, the related art includes using a rotating diffuser or a vibrating diffuser in the laser light transmission path, or increasing the spatial phase of the laser light by arranging a diffuser to destroy the interference condition of constant phase to reduce the speckle. The method is characterized in that the influence of speckles is weakened by vibrating an optical fiber, a screen and the like, but the method is limited by application scenes and cost, for example, the optical fiber is usually matched with a coupling lens to be used, a good speckle eliminating effect is achieved, the size is usually large, the method is not beneficial to household use, a driving circuit needs to be additionally arranged on the screen when the screen is vibrated, and along with the increase of the size of the screen, the difficulty and the cost brought to driving control are also high.
The existing commonly used speckle elimination scheme is that a speckle elimination element is added in a transmission light path based on laser, so that the complexity of the light path is increased, and the speckle elimination effect is related to the light processing efficiency of the light path design, so that the problem of eliminating speckles of the whole optical system is greatly restricted 1.
Disclosure of Invention
In order to solve the speckle technical problem of laser projection display, the invention provides a laser array which is applied to a laser light source, can emit laser beams with low coherence and is beneficial to reducing the speckle effect in laser projection display.
In order to achieve the purpose, the invention adopts the following technical scheme:
the present invention provides a laser array comprising:
the LED chip comprises a light-emitting chip arranged on a metal substrate and used for emitting a laser beam, wherein a sealing part is arranged along the light emitting direction of the laser beam and used for enclosing with the metal substrate to form a sealing space so as to seal the light-emitting chip in the sealing space;
wherein the sealing 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 from the light-emitting part through the two areas have different polarization directions;
preferably, the first light-transmitting region and the second light-transmitting region are disposed so that the polarization directions of the light beams transmitted through the two regions from the light-emitting portion are orthogonal; or,
the first light-transmitting region and the second light-transmitting region are arranged so that light beams transmitted through the two regions from the light-emitting portion are linearly polarized light and circularly polarized light, respectively;
preferably, the sealing part comprises a window support, and the first light transmission region and the second light transmission region respectively comprise a plurality of first light transmission units, a plurality of second light transmission units and a plurality of first light transmission units, and the second light transmission units are bonded on the window support; the curvature of the first light-transmitting unit and the curvature of the second light-transmitting unit are zero;
preferably, the first light transmission unit and the second light transmission unit are arranged at intervals in rows or columns.
Or 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 one is a half-wave plate or a quarter-wave plate;
preferably, the LED lamp further comprises a collimating part, wherein the collimating part comprises a plurality of collimating lens units, and the number of the collimating 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;
or the light emitting chip emits blue laser, red laser and green laser.
The invention also provides a laser light source which comprises the laser array.
The invention also provides laser projection equipment which comprises the laser light source.
The sealing part can seal and protect the laser light-emitting chip, and the first light-transmitting area and the second light-transmitting area of the sealing part have different transmission treatments for the laser beams, so that one area can allow the laser beams to be emitted according to the original polarization direction, and the other area can change the polarization direction of the laser beams, so that mixed beams of the laser beams with different polarization directions can be formed after the laser light-emitting chip penetrates through the sealing part, the laser beams with different polarization directions are mixed and output, the coherence among the laser beams is reduced, the low-coherence laser beams can be provided, and the speckle effect during rear-end laser projection display can be reduced.
The laser light source and the laser projection equipment provided by the invention also have the beneficial technical effects, the low-coherence laser beam can reduce or simplify the use of speckle elimination components in the optical path, the complexity of the whole optical path structure is favorably reduced, and the miniaturization of the laser light source and the laser projection equipment is favorably realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a prior art laser array;
FIG. 2A is a schematic cross-sectional view of an embodiment of a laser array;
FIG. 2B is a schematic cross-sectional view of another laser array in an embodiment of the 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 laser array encapsulation section of FIG. 2A;
FIGS. 4A,4B,4C, and 4D are schematic views of the arrangement of the sealing portion in the embodiment of the present invention;
FIG. 5 is a schematic diagram of an assembly structure of a laser array according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an arrangement of the collimating parts according to the embodiment of the present invention.
FIG. 7A is a schematic diagram of a front view of a laser array in an embodiment of the invention;
FIG. 7B is a schematic diagram of a front view of a laser array in an embodiment of the 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 illustrating an architecture of a laser projection apparatus according to an embodiment of the present invention;
fig. 10A and 10B are schematic diagrams illustrating changes in polarization directions of laser beams according to embodiments of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment,
Referring to fig. 2A, fig. 2A is a schematic cross-sectional view of a laser array according to an embodiment of the present invention, the laser array includes a light emitting part 021 for emitting a laser beam, and a sealing part 022 arranged along a light emitting direction of the light emitting part 021 for transmitting the laser beam. Specifically, referring to fig. 3A, the light emitting part 021 includes a light emitting chip 0211, and a metal substrate 0212, and the light emitting chip is connectively fixed to the metal substrate 0212. The light emitting chip 0211 emits a laser beam under electric drive, wherein the laser beam is linearly polarized light. And, the sealing part 022 includes a first light transmission region and a second light transmission region, wherein the first light transmission region and the second light transmission region are disposed such that light beams transmitted through the two regions from the light emitting part 022 have different polarization directions, and in one implementation, the first light transmission region and the second light transmission region of the sealing part 022 are disposed such that polarization directions of light beams transmitted through the two regions from the light emitting part 021 are orthogonal, or, in another implementation, the first light transmission region and the second light transmission region are disposed such that light beams transmitted through the two regions from the light emitting part 021 are linearly polarized light and circularly polarized light, respectively.
Referring to fig. 5, a light emitting chip (not shown) disposed on a metal substrate 0512 for emitting a laser beam is provided with a sealing portion 052 along a light emitting direction of the laser beam for enclosing with the metal substrate 0512 to form a sealing space, and the light emitting chip is sealed in the sealing space. The sealing portion 052 may be fixedly attached to the metal substrate 0512 by soldering or glass paste.
Referring to fig. 2A, the sealing portion 22 is a light-transmitting layer structure covering the light-emitting side of the laser beam of the light-emitting portion 021, and in one embodiment, referring to fig. 3B, the sealing portion 022 includes a window support 0221, and a plurality of hollow windows 0222 are formed on the window support 0221 for adhering and accommodating a plurality of light-transmitting units. In a specific implementation, the light transmitting unit is a sealing part, has zero curvature, and is used for transmitting the laser beam without generating a convergent collimation effect on the laser beam.
Specifically, a plurality of light transmitting units (not shown in the figure) may be cured and adhered to the window support 0221 by UV glass paste, and the plurality of light transmitting units are divided into two regions according to whether the polarity of the transmitted laser light is changed or not: a first light-transmitting region and a second light-transmitting region. The polarization direction of the laser beam emitted by the light emitting part 021 after passing through the first light transmission region and the second light transmission region is different, for example, as shown in fig. 10A, the original linear polarization is changed into circular polarization, and 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, it is assumed that the laser beam passing through the first light transmission region is P light, the laser beam passing through the second light transmission region is S light, the polarization directions of the two are in a 90-degree turnover relationship, and the polarities are perpendicular to each other.
In one embodiment, one of the first and second light-transmitting regions is made of flat glass, and the other is made of quarter-wave plate, so that after the laser beam is transmitted through the first and second light-transmitting regions, one of the linear polarization directions still keeps the original linear polarization direction, and the other one passes through the quarter-wave plate, because the linearly polarized light vertically enters the quarter-wave plate and the polarization direction of the linearly polarized light forms an angle of 45 degrees with the optical axis of the wave plate, circularly polarized light is generated to form a situation as shown in fig. 10A such that the circularly polarized light has a plurality of polarization directions, there are a plurality of polarization directions different from the original linearly polarized light, such that the coherence of the light beams having the different polarization directions with each other is reduced, therefore, the laser array can emit low-coherence laser beams, and is beneficial to reducing the speckle effect during rear-end laser projection display.
In another embodiment, one of the first light-transmitting area and the second light-transmitting area is made of flat glass, and the other is made of a half-wave plate, so that after the laser beam passes through the first light-transmitting area and the second light-transmitting area, one of the first light-transmitting area and the second light-transmitting area still keeps the original linear polarization direction, and after the other passes through the half-wave plate, the polarization direction is reversed by 90 degrees, and polarized light with a polarity different from that of the original laser beam is emitted, so as to form the situation shown in fig. 10B, which can convert between P light and S light, and two laser beams with mutually perpendicular polarization directions can generate superposition of two independent random patterns when entering the same scattering element (speckle elimination component), so as to be more beneficial to reducing speckle effect, and two laser beams with different polarization directions and same frequency can be considered as incoherent, so that coherence of the laser beams emitted by the laser array is greatly reduced, and is useful for reducing or eliminating the speckle effect.
In one embodiment, a plurality of flat glass plates, half-wave plates or quarter-wave plate elements are arranged according to the number of the panes contained in the first light transmission area and the second light transmission area, and are respectively adhered to the window of the sealing part window support and are opposite to the emergent light beam of each laser light emitting chip, and the sealing part is in a grid-shaped light transmission structure.
In another embodiment, the sealing portion is an integral light-transmitting structure, and the transmission characteristics of different regions are realized by region coating, for example, the polarization direction can be changed by partial coating. The position of the specific coating can be determined according to the requirement for changing the polarization direction of the laser beam.
And, in another embodiment, the non-polar conversion element can be made of a diffusion sheet material in addition to flat glass, so that the laser beam can be homogenized while being transmitted through.
In an embodiment, a plurality of light transmitting units are adhered to the window 0221 to form a light transmitting layer structure in a window grid shape, as shown in a schematic view of a laser array package structure shown in fig. 5, a sealing portion of the light transmitting layer structure covers a light emitting direction of the light emitting chip, and an edge portion of the light transmitting layer structure may be fixed to the metal substrate by welding or gluing, specifically, the window support and the metal substrate may be fixed by resistance welding to form a sealed space, and the light emitting chips are all contained in the sealed space to protect the light emitting chips and play a role in dust prevention and isolation. Optionally, the sealed space is filled with nitrogen, so that oxidation of the light emitting chip can be further prevented, the performance of the laser is improved, and the service life of the laser is prolonged.
The first light-transmitting region and the second light-transmitting region of the sealing portion respectively include a plurality of first light-transmitting units and a plurality of second light-transmitting units, and the plurality of first light-transmitting units and the plurality of second light-transmitting units are bonded in the 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 equal 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, each light emitting chip of the laser emits a light beam corresponding to one light transmitting unit and transmits through the light transmitting unit. For example, when the laser array includes 20 lasers, that is, 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 first light transmitting unit or each second light transmitting unit faces the light emitting direction of one light emitting chip.
Of course, light beams emitted by several laser light emitting chips may be incident on the light transmitting units, that is, the first light transmitting unit and the second light transmitting unit are divided into different numbers of 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 is set to 5, which totally results in 10 light transmitting units, so that laser beams emitted by every two laser light emitting chips are incident on one light transmitting unit.
When the total number of the light-transmitting units is consistent with the total number of the light-emitting chips of the laser, 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, the arrangement structure of the sealing portion light-transmitting cells will be described in detail with reference to the examples given in fig. 4A,4B,4C, and 4D. For simplicity, the laser array includes 20 laser light emitting chips, and the description is made in an array arrangement manner of 4 × 5.
As illustrated in fig. 4A, the sealing part 22 includes a plurality of first light-transmitting units 0222a, indicated by filled vertical lines, in the figure, the plurality of light-transmitting units 0222a constituting the first light-transmitting region, and a second light-transmitting unit 0222b, indicated by blank squares in the figure, the plurality of light-transmitting units 0222b constituting the second light-transmitting region. In the example of fig. 4A, laser light emitting chips (not shown) are arranged in an array to emit P light, wherein, for example, the first light transmitting unit 0222a is a half-wave plate, the second light transmitting unit 0222b is flat glass, after a plurality of laser beams emitted by the light emitting unit penetrate through a first light transmitting area formed by a plurality of first light transmitting units 0222a, the polarity is reversed from the P light to S light, and after a plurality of laser beams emitted by the light emitting unit penetrate through a second light transmitting area formed by a plurality of second light transmitting units 0222b, because the flat glass does not change the polarity of the laser beams, the laser beams still remain P light, that is, after the laser beams emitted by the light emitting unit penetrate through the first light transmitting area and the second light transmitting area, the polarization directions of the laser beams are different and perpendicular to each other.
Wherein the flat plate glass and the half-wave plate can be the same size. The thickness of the flat glass or the half-wave plate can 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 first light-transmitting units and the second light-transmitting units may be arranged in rows at intervals, 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 laser beam transmits the second light-transmitting area, the polarity is turned over by 90 degrees, and the original P light is changed into S light, and the P light and the S light in the laser beam emitted from the laser array are arranged at intervals, and are mixed light of the P light and the S light, and the simultaneous emission of the light beams with different polarities is beneficial to reducing the coherence of the light beams.
In practical applications, it is preferable that 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 intervals, so that the light quantity of the emitted P light and the emitted S light can be equivalent, and the effect of decoherence is better, because according to the definition of speckle contrast:
For two beams with different orthogonal polarization directions, when the beams are incident on the same type of scattering element (speckle elimination device), independent speckle patterns are generated, wherein each pattern is one of two orthogonal polarization components. According to the above formula, if the two independent speckle patterns are of equal intensity, N is 2, the speckle contrast can be reduced to 1/v 2, and a better speckle fading effect can be obtained.
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 perpendicular to each other, the polarities of the laser beams in the second row and the third row are also different, and the polarization directions are perpendicular to each other, and similarly, the same applies to the third row and the fourth row, so that the polarities of the light beams emitted by the four rows of light-emitting chips are opposite to each other.
Alternatively, as shown in fig. 4B, the first and second light-transmitting units 0222a and 0222B may be arranged in a row-to-row manner8And in alternate arrangement, the first light-transmitting area includes three rows of first light-transmitting units 0222a, such as a flat glass or a diffusion sheet, the second light-transmitting area includes two rows of second light-transmitting units 0222b, such as a half-wave plate, the laser beam still maintains the original polarity after transmitting through the first light-transmitting units of the first light-transmitting area, such as P light, and the laser beam changes the polarity after transmitting through the second light-transmitting units of the second light-transmitting area by 90 degrees, so that the original P light is changed into S light, the P light and the S light in the laser beam emitted by the laser array are alternately arranged, and are mixed light of the P light and the S light, if the light emission intensity of each laser light-emitting chip is the same as that shown in fig. 4A, the light intensity of the P light and the S light with different polarities at this time has a certain difference and is no longer equivalent, and the light intensity of the P light is greater than that. The effect of such decoherence is slightly lower than in the case shown in fig. 4A. Of course alsoThe power of the laser light emitting chip can be adjusted to make the light intensity of the P light and the light intensity of the S light equivalent, so that a better speckle-dissipating effect can be obtained.
In order to obtain the speckle contrast value as small as possible, and make the light intensities of the two lights with different polarization directions as equivalent as possible without changing the light emitting power of the light emitting chip of the laser, it is preferable that the first light transmitting unit and the second light transmitting unit are arranged in line or column intervals when the number of lines or columns of the laser array is an even number.
Fig. 4C shows an arrangement example of the light transmitting cells of the further sealing portion. Wherein, the first light transmission unit 0222a and the second light transmission unit 0222b are arranged in a checkerboard pattern, that is, the first light transmission unit and the second light transmission unit are adjacent to each other two by two, when the laser light emitting chips are arranged in 4x5 rows and columns, the first light transmission unit is 10, the second light transmission unit is also 10, the laser light emitting chips emit P light, the first light transmission unit 0222a is flat glass, the second light transmission unit 0222b is a half-wave plate, the light beam transmitted by the laser light emitting chips through the first row of light transmission units is P light, S light, P light, and P light, the light beam transmitted by the second row of light transmission units is S light, P light, S light, the third row is the same as the first row, the fourth row is the same as the second row, by such arrangement, the P light and S light beams can be arranged adjacent to each other, the mixing is more uniform, the total light intensity is equivalent, thereby the coherence of the light beams after the adjacent light emitting chips pass through the, therefore, the speckle effect during laser projection display can be reduced.
And, in another embodiment, when the laser light emitting chips are not arranged in regular rows and columns, such as the case shown in fig. 4D, the laser light emitting chips can be arranged more compactly, which is beneficial to reducing the volume. Wherein the schematic first light-transmitting units in a checkered pattern and the schematic second light-transmitting units in diagonal line hatching are preferably arranged in such a manner that each first light-transmitting unit and each second light-transmitting unit are adjacent. Therefore, the adjacent light-transmitting units can respectively emit laser beams with different polarization directions as far as possible, the distribution of the P light and the S light is distributed in a balanced manner, the light intensity of the P light and the light intensity of the S light are equivalent, and the mixing homogenization degree is high.
As can be appreciated by those skilled in the art, based on the above-mentioned distribution principle, in consideration of the convenience of manufacturing, preferably, when the number of rows or columns is selected as an even number, the first light-transmitting units and the second light-transmitting units are arranged at row intervals or column intervals, and when the arrangement of the laser light-emitting chips is not a regular row-column arrangement, the two light-transmitting units are arranged in a manner that the first light-transmitting units and the second light-transmitting units are adjacent to each other two by two, so that the number of the two light-transmitting units is as large as possible.
In summary, in the arrangement of the sealing portions illustrated in fig. 4A to 4D, because different regions of the sealing portion have different processing manners for the laser beams, one region can allow the laser beams to emit according to the original polarization direction, and the other region can change the polarization direction of the laser beams, when the laser light emitting chip transmits through the sealing portion, a mixed beam of the laser beams with different polarization directions is formed, and the two laser beams with equivalent light intensities have a greater probability of forming a plurality of independent speckle patterns, which is beneficial to speckle elimination, 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 also be a quarter-wave plate, and the second light-transmitting unit may be made of flat glass or a diffusion sheet. The laser beam is changed from linearly polarized light to circularly 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 region, the second light-transmitting unit, the second light-transmitting region, and the laser emitting chip emitting P light, S light, or circularly polarized light in the above examples are not limited to the laser array, and are only used for illustrating a specific embodiment. In addition, in the implementation, those skilled in the art can understand that the material selection of the first light-transmitting unit and the second light-transmitting unit is not limited to the example of the embodiment, and the two units may be interchanged.
And, in practical application, because the divergence angles of the laser beam emitted by the laser light emitting chip on the fast axis and the slow axis are different, the actual laser beam is in a relatively large divergence state in the fast axis direction, for example, divergence of 30 degrees is provided, while the slow axis has only divergence angles of 8-10 degrees, and divergence conditions exist, therefore, as a laser array component, it is theoretically expected to emit a relatively parallel beam, and therefore, the beam emitted by the laser light emitting chip also needs to be collimated, and the collimated beam is emitted in a substantially parallel state, which is beneficial to the design of a rear optical path. In one embodiment, a microlens may be disposed directly above the laser light emitting chip as a collimating lens, and then the laser light emitting chip and the microlens are hermetically packaged, for example, the outermost layer of the laser array is disposed with a light transmissive layer and hermetically connected to the metal substrate, and the light emitting chip and the microlens are accommodated in the sealed space.
Referring to fig. 2B, a collimating part 023 is disposed at the light emitting side of the sealing part 022, and the collimating part 023 is a collimating lens group, which is composed of a plurality of lens unit structures and can collimate and converge light beams.
Referring to fig. 6, the collimator lens group includes a plurality of collimator lens units 0231, the number of the plurality of collimator lens units 0231 is the same as the number of the light emitting chips or the number of the light transmitting units of the sealing portion, that is, one collimator lens unit corresponds to one light transmitting unit of the sealing portion and also corresponds to one light emitting chip, and is used for collimating the laser beam which is emitted by the corresponding light emitting chip and which is 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, for example, as a fly-eye lens array.
Optionally, the collimating lens group can be integrally formed into a whole, so as to cover the light-emitting direction of the light-emitting chip or the light-emitting direction of the reflecting part; or 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 collimating lens group can be made of B270 or K9, and is made of optical glass with high light transmittance and high hardness.
Referring to fig. 5, which is a schematic structural diagram of a laser array package, a collimating part 053 is further disposed on the outermost side of the laser array, and specifically, the collimating part 053 is a fly-eye lens array. The periphery of the collimating part 053 is bonded to the sealing part 052 or the periphery of the metal substrate 0512 by UV glue, so as to form a packaged laser array. After packaging, the light emitting chip (not shown) is enclosed in a sealed space formed by the sealing portion 052 and the metal substrate 0512. And a pin 0514 is led out from the side surface of the metal substrate.
In one embodiment, the light emitting chip can be directly soldered to the metal substrate by solder, or, as shown in fig. 3A, the light emitting chip 0211 can 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 thermal adhesive, and the other side of the heat sink is then fixedly connected to the metal substrate 0212 by soldering or thermal adhesive.
It should be noted that the connection method of the light emitting chip and the metal substrate is not limited specifically, and may be a welding method, or a thermal conductive adhesive bonding method, as long as it is ensured that the connection method does not affect the heat conduction greatly.
Each light emitting chip can be connected in series through an electrical connection mode, and specifically, each light emitting chip can be connected with a gold wire which is finally connected to a Pin (Pin) so as to realize the electrification of each light emitting chip. Alternatively, the gold wire 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, which has good thermal conductivity and a thickness selected from 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 all 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; and a part of the light emitting chips can emit blue light, a part of the light emitting chips can emit red light, and a part of the light emitting chips can emit green light.
In one embodiment of the present invention, if a plurality of light emitting chips in the laser array emit light of the same color, whether blue, red or green, 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. In this embodiment, the wavelength difference is preferably at least 1nm, and more preferably 2 nm.
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 transmitting unit and the second light transmitting unit. Therefore, the blue laser and the red laser have different wavelengths and different polarization polarities, and speckle elimination can be performed from two dimensions of time coherence and space coherence together.
As shown in fig. 7A, a schematic diagram of a light emitting surface structure of a two-color laser array is shown, where a red laser emitting chip and a blue laser emitting chip may be arranged adjacent to each other, a first light transmitting unit and a second light transmitting unit cover light emitting surfaces of the blue laser emitting chip and the red laser emitting chip, and are also arranged at intervals, taking the first light transmitting unit as a half-wave plate and the second light transmitting unit as flat glass as an example, the first light transmitting units in the first row and the third row respectively normally transmit blue laser, and the second light transmitting units in the second row and the fourth row transmit red laser with reversed polarity.
Certainly, the red laser light emitting chips and the blue laser light emitting chips may also be arranged at intervals in rows or columns, for example, the first row and the third row are blue laser light emitting chips, the second row and the fourth row are red laser light emitting chips, and the first light transmitting unit and the second light transmitting unit are not arranged in rows or columns but arranged adjacently in pairs according to a checkerboard, so that a plurality of laser beams with different wavelengths and different polarities and possibly different polarities even if the wavelengths are the same can be obtained, and thus the speckle contrast of the laser beams in the polarization direction can be reduced, and a better speckle elimination effect can be obtained.
As shown in fig. 7B, a schematic diagram of a light-emitting surface structure of a three-color laser array is shown, wherein among a plurality of light-emitting chips arranged in an array, a red, green and blue three-color laser light-emitting chip is included, wherein the first row and the second row are blue laser light emitting chips, the third row is a red laser light emitting chip, the fourth row is a green laser light emitting chip, wherein the first and third rows are provided with first light-transmitting units, the second and fourth rows are provided with second light-transmitting units, thus, the blue laser transmitted by the first row and the second row of light-transmitting units have different polarities, the blue laser transmitted by the second row of light-transmitting units has different polarity from the red laser transmitted by the third row, the red laser transmitted by the third row of light-transmitting units has different polarity from the green laser transmitted by the fourth row of light-transmitting units, so that the entire laser array can emit a plurality of laser beams of different wavelengths and different polarities.
The multicolor laser array in the above embodiment can emit laser beams with various wavelengths and different polarities, and can also 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 again.
Example II,
The invention also provides a laser light source, as shown in fig. 8, comprising a laser array 801, 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 homogenizing part 803 and then is incident into an optical machine. The light uniformizing unit 803 may be a light guide or a fly eye lens. Before entering the homogenizing part 803 or after being homogenized by the homogenizing part 803, the shaped laser beam can be subjected to speckle elimination by a moving diffusion wheel, a diffusion sheet or a phase adjusting device.
The laser array 801 in this embodiment may be any one of the examples of the laser array in the embodiments, and due to the adoption of the laser array, the coherent characteristic or the speckle effect of the laser beam can be suppressed from the source, and a high-quality illumination beam is provided, more importantly, the use of a speckle elimination component in the optical path can be greatly simplified, the optical path architecture is simplified, and the miniaturization is facilitated.
Example III,
The invention further provides a laser projection apparatus, as shown in fig. 9, which includes a laser light source 901, an optical modulation device 902, and a projection lens 903, where the laser light source 901 emits a laser beam to form an illumination beam to irradiate the optical modulation device 902, specifically, to irradiate the optical modulation device 902, in a DLP architecture, the optical modulation device 902 may specifically be a DMD digital micromirror array, which includes millions of tiny mirrors, the optical modulation device 902 modulates the illumination beam according to a driving signal corresponding to an image display signal, and the modulated light beam enters the projection lens to be imaged, where the laser light source is the laser light source in the above embodiment. The laser projection device provided in this embodiment may be a laser projector or a laser projection television, where the laser light source can improve a high-quality illumination beam, reduce a speckle effect, and facilitate simplification of an optical architecture, thereby realizing miniaturization of the laser projection device.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A laser array is characterized by comprising a light-emitting chip arranged on a metal substrate and used for emitting a laser beam, wherein a sealing part is arranged along the light emitting direction of the laser beam and used for enclosing with the metal substrate to form a sealing space so as to seal the light-emitting chip in the sealing space;
wherein the sealing portion includes a first light-transmitting region and a second light-transmitting region, the first light-transmitting region and the second light-transmitting region being disposed such that light beams transmitted through the two regions from the light-emitting portion have different polarization directions.
2. The laser array according to claim 1, wherein the first light-transmitting region and the second light-transmitting region are provided so that polarization directions of light beams transmitted from the light-emitting section through the two regions are orthogonal; or,
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 are linearly polarized light and circularly polarized light, respectively.
3. The laser array of claim 1 or 2, wherein the sealing portion comprises a window support, and the first and second light-transmitting regions respectively comprise a plurality of first and second light-transmitting units, and the plurality of first and second light-transmitting units are bonded to the window support; the curvature of the first light-transmitting unit and the curvature of the second light-transmitting unit are zero.
4. The laser array of claim 3, wherein the first and second light-transmissive units are arranged in rows or columns.
5. The laser array of claim 3, wherein each of the first light-transmissive cells and each of the second light-transmissive cells are arranged adjacent to each other.
6. The laser array of any of claims 1 to 5, wherein one of the first and second light transmissive regions is a flat glass or diffuser and the other is a half-wave plate or a quarter-wave plate.
7. The laser array of any one of claims 1 to 5, further comprising a collimating section, wherein the collimating section comprises a plurality of collimating lens units, and the number of the collimating lens units is equal to the number of the light emitting chips.
8. The laser array of claim 6 or 7, wherein the light emitting chip emits light beams with one of blue, green and red colors; 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.
9. A laser light source comprising the laser array according to any one of claims 1 to 8, and a converging/shaping member for converging and shaping a laser beam emitted from the laser array to form an illumination beam.
10. A laser projection device is characterized by comprising a laser light source, an optical modulation device and a projection lens, wherein the laser light source emits a laser beam to form an illumination beam to irradiate the optical modulation device, the optical modulation device 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 according to claim 9.
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| CN201811095967.7A CN110928119B (en) | 2018-09-19 | 2018-09-19 | Laser array, laser light source and laser projection equipment |
| CN202311592964.5A CN117784509A (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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| CN111338094A (en) * | 2020-04-28 | 2020-06-26 | 黎明职业大学 | Laser light source based on multi-element composite speckle elimination |
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| CN117784509A (en) | 2024-03-29 |
| CN110928119B (en) | 2023-10-13 |
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