CN113867090A - Projection equipment and light source device thereof - Google Patents

Abstract

The embodiment of the disclosure discloses a projection device and a light source device thereof, wherein the light source device comprises a laser module and an optical array group. The laser module comprises a module carrier and a plurality of laser transmitters, and a plurality of laser transmitter arrays are arranged on the module carrier; the optical array group comprises a plurality of optical arrays and a plurality of light-transmitting layers which are sequentially arranged on one side of the laser module along the optical axis direction, each optical array comprises a plurality of optical units which are arranged along a plane array perpendicular to the optical axis, and the optical units are arranged corresponding to the laser emitters; the laser emitted by each laser emitter passes through the light-transmitting layer and the plurality of optical units corresponding to each other. The optical array comprises a plurality of optical units which are arranged along a plane array perpendicular to an optical axis, and the optical units are arranged corresponding to laser emitters in the laser array, so that the use of large-size lens elements is reduced, and the problem of space waste caused by the fact that the size of the lens elements is too large in the prior art is solved.

Description

Projection equipment and light source device thereof

Technical Field

The disclosure relates to the field of display, in particular to a projection device and a light source device thereof.

Background

The existing laser projection design ideas are designed along with the design ideas of the traditional bulb machine and LED light source projection. Therefore, the conventional lens is mainly used for controlling the spot size and the transmission angle of a plurality of beams of laser in the current laser projection scheme. Under the projection scheme, in order to ensure the processing effect on the laser, the difference between the size of the lens and the size of the laser spot is often more than 1 order of magnitude, so that the overall volume of the projection equipment is overlarge, and serious space waste is caused.

Disclosure of Invention

The embodiment of the disclosure provides a projection device and a light source device thereof, which can solve the technical problem that in the prior art, the overall size of the projection device is too large due to the fact that the size of a lens is too large, and serious space waste is caused.

The embodiment of the disclosure provides a light source device, which comprises a laser module and an optical array group. The laser module comprises a plurality of laser transmitters arranged in an array; the optical array group comprises a plurality of optical arrays which are sequentially arranged on one side of the laser module along the direction of an optical axis, each optical array comprises a plurality of optical units which are arranged in an array along the direction vertical to the optical axis, and each optical unit is arranged corresponding to the laser transmitter; the laser emitted by each laser emitter passes through a plurality of optical units corresponding to each other.

Optionally, the plurality of optical array groups comprises:

the first optical array comprises a plurality of collimating lens units, and each collimating lens unit is arranged corresponding to the laser emitter;

the light source device further comprises at least one light-transmitting layer comprising:

and the first variable-refractive-index light-transmitting layer is arranged on the light emergent side of the first optical array along the optical axis direction.

Optionally, the at least one light transmitting layer further comprises:

and the diffusion euphotic layer is arranged on the light emergent side of the first variable refractive index euphotic layer along the direction of an optical axis.

Optionally, the plurality of optical arrays further comprises:

the second optical array is arranged on the light emitting side of the diffusion light-transmitting layer along the optical axis direction and comprises a plurality of light homogenizing units, and each light homogenizing unit is arranged corresponding to the laser emitter.

Optionally, the light source device further includes:

and the light receiving element is arranged on the light emitting side of the optical array group along the optical axis direction.

Optionally, the at least one light-transmitting layer further includes a second variable refractive index light-transmitting layer, the plurality of optical arrays further includes a third optical array and a fourth optical array, and the third optical array, the second variable refractive index light-transmitting layer and the fourth optical array are sequentially disposed on a side of the first variable refractive index light-transmitting layer facing away from the laser module; the third optical array comprises a plurality of light spot compression units, and each light spot compression unit is arranged corresponding to the laser emitter; the fourth optical array comprises a plurality of light receiving units, and each light receiving unit is arranged corresponding to the laser emitter.

Optionally, the spot compressing unit is provided with a plurality of layers in an optical axis direction.

Optionally, the third optical array is located between the first variable index light transmissive layer and the diffusive light transmissive layer.

Optionally, in the optical axis direction, the optical units of the plurality of optical arrays and the adjacent part of the light-transmitting layer are integrated into a unit assembly, the plurality of unit assemblies and the plurality of laser emitters are arranged in a corresponding array, and two adjacent unit assemblies are connected with each other to form an optical array module.

On the other hand, this disclosure provides a projection arrangement, include as above light source device, prism group, spatial light modulator and lens subassembly, the laser that the laser module launched passes behind the optical array group, passes through again the prism group refracts, and the back is again through spatial light modulator reflects, wears out the lens subassembly.

In the embodiment of the disclosure, by arranging a plurality of optical arrays, each optical array comprises a plurality of optical units arranged along a plane array perpendicular to an optical axis, and the optical units are arranged corresponding to the laser emitters in the laser arrays, the use of large-size lens elements is reduced, and thus the problem of space waste caused by the overlarge size of the lens elements in the prior art is solved.

Drawings

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

Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of an optical array provided in an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a projection apparatus according to an embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a projection apparatus according to another embodiment of the present disclosure.

Fig. 5 is a schematic structural diagram of a spot compression unit provided in the embodiment of the present disclosure.

Fig. 6 is a schematic structural diagram of a projection apparatus according to still another embodiment of the present disclosure.

Description of reference numerals:

thelight source device 10, theprism group 20, thespatial light modulator 30, thelens assembly 40, thelaser module 100, theoptical array group 200, the spatial lightmodulator module carrier 110, thelaser emitter 120, theoptical unit 201, theoptical carrier 202, the firstoptical array 210, the first variable refractive index light-transmitting layer 220, the diffusion light-transmittinglayer 230, the secondoptical array 240, the thirdoptical array 250, the second variable refractive index light-transmittinglayer 260, the fourthoptical array 270, thecollimating lens unit 211, thedodging unit 241, the lightspot compression unit 251, thelight receiving unit 271, thelight receiving element 280, thefirst block unit 203, thesecond block unit 204, and theunit assembly 209.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, and are not intended to limit the present disclosure. In the present disclosure, unless otherwise specified, use of the directional terms "upper" and "lower" generally refer to upper and lower, and specifically to the orientation of the drawing figures in the drawings, in the actual use or operating condition of the device; while "inner" and "outer" are with respect to the outline of the device.

The embodiments of the present disclosure provide a projection apparatus and a light source device thereof, which are described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.

The present disclosure provides a projection device that can be adapted for use in home, education, work, and outdoor scenarios. Referring to fig. 1, the projection apparatus includes alight source device 10, aprism group 20, aspatial light modulator 30, and alens assembly 40 sequentially arranged along an optical axis direction.

Referring to fig. 3, thelight source device 10 includes alaser module 100 and anoptical array assembly 200.Laser module 100 includes amodule carrier 110 and a plurality oflaser emitters 120. A plurality oflaser emitters 120 are arrayed on the module carrier. Thelaser emitters 120 are light sources of the projection device, and the laser light emitted by all thelaser emitters 120 together form a projection light of the projection device. In some embodiments of the present disclosure, the wavelengths of the laser lights emitted by twoadjacent laser emitters 120 are different, so as to form a red laser light, a green laser light, and a blue laser light corresponding to different colors. Thelaser emitters 120 emitting red laser light, thelaser emitters 120 emitting green laser light, and thelaser emitters 120 emitting blue laser light are arranged in a staggered manner to form a pixel.

Referring to fig. 2, theoptical array set 200 includes a plurality of optical arrays and at least one light-transmitting layer sequentially disposed on one side of thelaser module 100 along the optical axis direction, and the optical arrays include a plurality ofoptical units 201 disposed along a planar array perpendicular to the optical axis. In this embodiment, theoptical units 201 are disposed corresponding to thelaser emitters 120, and may be disposed in a one-to-one correspondence manner, or oneoptical unit 201 is disposed corresponding to a plurality oflaser emitters 120, or onelaser emitter 120 is disposed corresponding to a plurality ofoptical units 201.Spatial light modulator 30 is disposed on a side ofprism assembly 20 adjacent to the optical array, andlens assembly 40 is disposed on a side ofprism assembly 20 facing away fromspatial light modulator 30. In other embodiments, thespatial light modulator 30 may also be disposed on a side of theprism group 20 opposite to theoptical array group 200, and the relative positions of theoptical array group 200, thelaser module 100, thespatial light modulator 30, and thelens assembly 40 to theprism group 20 may be set according to a specific light path, which is not limited in this application.

In the present embodiment, theoptical units 201 are not necessarily arranged along a planar array perpendicular to the optical axis, and may be arranged along a curved array perpendicular to the optical axis, or arranged along a polygonal line array symmetrical about the optical axis.

The laser emitted from eachlaser emitter 120 passes through the transparent layer and the plurality of optical units corresponding thereto, is processed by the optical units and the transparent layer, is refracted by theprism group 20, is reflected by thespatial light modulator 30, and passes out of thelens assembly 40.

The embodiment is provided with a plurality of optical arrays, each optical array comprises a plurality ofoptical units 201 arranged along a plane array perpendicular to the optical axis, and theoptical units 201 are arranged corresponding to thelaser emitters 120 in the laser arrays, so that the use of large-size lens elements is reduced, and the problem of space waste caused by overlarge size of the lens elements in the prior art is solved.

Thespatial light modulator 30 may be a plurality of Digital Micromirror Devices (DMDs), Liquid Crystal On Silicon (LCOS) devices, and other Liquid Crystal Display (LCD) devices, and the disclosure is not limited thereto.

The prism set 20 may be a Polarization Beam Splitter (PBS) prism, a Total Internal Reflection (TIR) prism, and the like, and the disclosure is not limited thereto.

In combination with fig. 3, 4 and 6, the plurality of optical arrays and the at least one light-transmitting layer of theoptical array set 200 include a firstoptical array 210, a first light-transmittinglayer 220 with variable refractive index, a diffusing light-transmittinglayer 230 and a secondoptical array 240 sequentially arranged along the optical axis direction.

The firstoptical array 210 includes a plurality ofcollimating lens units 211 arranged along a plane array perpendicular to the optical axis, in this embodiment, thecollimating lens units 211 are fast-axis and slow-axiscollimating lens units 211 using fast-axis and slow-axis collimating lenses, and in other embodiments, thecollimating lens units 211 using other types of collimating lenses may also be used. The first variable refractive indextransparent layer 220 is disposed on the light emitting side of the firstoptical array 210 along the optical axis direction, and is a transparent plate having an area similar to that of the firstoptical array 210. The diffusingtransparent layer 230 is disposed on the light emitting side of the first variable refractive indextransparent layer 220 along the optical axis direction, and is a transparent plate having an area close to that of the firstoptical array 210. The secondoptical array 240 is disposed on a side of the diffusivelight transmissive layer 230 facing away from thelaser module 100 along the optical axis direction, and the secondoptical array 240 includes a plurality oflight homogenizing units 241 disposed along a planar array perpendicular to the optical axis.

Thecollimating lens unit 211, thedodging unit 241 and thelaser emitter 120 are in a one-to-one correspondence relationship. The laser emitted from thelaser emitter 120 first passes through the correspondingcollimating lens unit 211 and the first variable refractive index light-transmittinglayer 220 to become a collimated laser beam, and then passes through the diffusing light-transmittinglayer 230 and thecorresponding dodging unit 241 to homogenize and diffuse the laser. The homogenized and diffused laser is processed by light collection to form a surface light source with the size matched with that of the spatiallight modulator 30. Then, the surface light source is refracted by theprism group 20, enters the spatiallight modulator 30, is subjected to imaging processing by the spatiallight modulator 30, and is reflected out of thelens assembly 40.

The refractive index of the first variable refractive index light-transmittinglayer 220 may be slightly higher than the refractive index of thecollimating lens unit 211, or slightly lower than the refractive index of thecollimating lens unit 211, so as to ensure that the laser beam is refracted when entering the first variable refractive index light-transmittinglayer 220, so as to ensure that the emitted laser beam becomes a collimated laser beam.

In other embodiments, the function of homogenizing and diffusing the laser light can be achieved by the diffusingtransparent layer 230 alone, and the secondoptical array 240, which is used as an optical array for assisting the diffusingtransparent layer 230 to homogenize and diffuse the laser light beam, needs to be disposed adjacent to the diffusingtransparent layer 230.

In the present disclosure, there are various ways of performing the light receiving process on the laser light, and the following will exemplify.

In some embodiments of the present disclosure, referring to fig. 3, the light receiving processing of the laser is performed by thelight receiving element 280. In this embodiment, the projection apparatus includes alight receiving element 280 disposed on the light emitting side of the optical array set 200 along the optical axis direction. Thelight receiving element 280 includes a plurality of lenses for adjusting the area of the surface light source. The laser light homogenized and diffused by the light-diffusing and light-transmittinglayer 230 and the light-homogenizing unit 241 passes through the light-receivingelement 280, and is subjected to light-receiving processing by the light-receivingelement 280 to form a surface light source with a size matched with that of the spatiallight modulator 30.

In other embodiments of the present disclosure, referring to fig. 4, the optical array further includes a thirdoptical array 250, and the transparent layer further includes a second variable refractive indextransparent layer 260 and a fourthoptical array 270. The thirdoptical array 250, the second variable refractive index light-transmittinglayer 260, and the fourthoptical array 270 are sequentially disposed in the optical axis direction.

The fourthoptical array 270 is disposed along the optical axis direction at one end of the first variable refractive-index light-transmittinglayer 220 away from thelaser module 100, the fourthoptical array 270 includes a plurality of light-receivingunits 271, and each light-receivingunit 271 corresponds to thelaser emitter 120. The second variable refractive index light-transmittinglayer 260 is disposed on one side of the fourthoptical array 270 facing thelaser emitter 120 along the optical axis direction, the thirdoptical array 250 is disposed between the fourthoptical array 270 and the first variable refractive index light-transmittinglayer 220 along the optical axis direction, and includes a plurality ofspot compression units 251 disposed along a planar array perpendicular to the optical axis, each spot compression unit is disposed corresponding to thelaser emitter 120, and eachlight receiving unit 271 is disposed corresponding to the light emitted by thespot compression unit 251.

In one embodiment of the present disclosure, the thirdoptical array 250 is disposed between the first variable refractive indexlight transmitting layer 220 and the diffusivelight transmitting layer 230. The second variable refractive index light-transmittinglayer 260 is disposed at the light emitting side of the secondoptical array 240, and the fourthoptical array 270 is disposed at the light emitting side of the second variable refractive index light-transmittinglayer 260.

The laser emitted from thelaser emitter 120 first passes through the correspondingcollimating lens unit 211 and the first variable refractive index light-transmittinglayer 220 to become a collimated laser beam. Multiple collimated laser beams pass through thespot compression unit 251 to form collimated laser beams with smaller intervals to complete the first light receiving process, and then the collimated laser beams pass through the light diffusion andtransmission layer 230 and the correspondinglight homogenizing unit 241 to complete the homogenization and diffusion. The homogenized and diffused laser beam is subjected to a second light receiving treatment by the second variable refractive index light-transmittinglayer 260 and the correspondinglight receiving unit 271, and a surface light source with the size matched with that of the spatiallight modulator 30 is formed. Then, the surface light source is refracted by theprism group 20, enters the spatiallight modulator 30, is subjected to imaging processing by the spatiallight modulator 30, and is reflected out of thelens assembly 40.

The second variable refractive index light-transmittinglayer 260 is a light-transmitting layer that performs light receiving processing in cooperation with the fourthoptical array 270, and therefore needs to be disposed adjacent to the fourthoptical array 270. Meanwhile, the refractive index of the second variable refractive index light-transmittinglayer 260 may be slightly higher than the refractive indexes of the diffusion light-transmittinglayer 230 and the corresponding light-equalizingunit 241, or slightly lower than the refractive indexes of the diffusion light-transmittinglayer 230 and the corresponding light-equalizingunit 241, so as to ensure that the laser beam is refracted when entering the second variable refractive index light-transmittinglayer 260.

Meanwhile, referring to fig. 5, thespot compression unit 251 is composed of a plurality of prisms, and two parallel collimated lasers are incident into thespot compression unit 251 and then are refracted by thespot compression unit 251 to become two parallel collimated lasers with a shorter distance. Therefore, when there are a plurality of rows of laser arrays, a multi-layer process is required, and in this embodiment, thespot compressing unit 251 is provided with a plurality of layers along the optical axis direction to compress the plurality of rows of laser beams together.

For example, when three rows of lasers need to be compressed, at least two layers of spot compression arrays need to be arranged to compress the lasers on two sides towards the lasers in the middle.

In an embodiment of the present disclosure, the thirdoptical array 250 may be disposed at any position before the fourthoptical array 270, and the present disclosure is not limited thereto. When the thirdoptical array 250 is disposed between the first variable refractive index light-transmittinglayer 220 and the diffusive light-transmittinglayer 230, the efficiency of the compression laser light may be improved.

In some embodiments of the present disclosure, the optical arrays may be integrally formed, and may be made of transparent materials such as glass, transparent plastic, etc. and cast after being injected into a mold. The optical array comprises onlyoptical units 201 arranged in close connection with a planar array along a perpendicular optical axis when the corresponding openings of theoptical units 201 in the mold are maximized. When the corresponding opening of theoptical unit 201 in the mold is smaller, the optical array includes anoptical carrier 202 and theoptical units 201 arranged on theoptical carrier 202.

In other embodiments of the present disclosure, in the optical axis direction, the optical units of the optical arrays and the adjacent partially transparent layers are integrated into aunit module 209, theunit module 209 and thelaser emitter 120 are arranged in a corresponding array, and twoadjacent unit modules 209 are connected to each other to form an optical array module.

In one embodiment, referring to fig. 6, the optical array (except for the third optical array 250) may also be composed of a plurality of independent block units, which are thefirst block units 203. Eachfirst block unit 203 includes oneoptical unit 201 therein. Thefirst block units 203 are arranged in an array corresponding to thelaser emitters 120, and eachfirst block unit 203 is connected with the adjacentfirst block units 203 in an adhering mode to form an optical array.

Meanwhile, in other embodiments of the present disclosure, the light-transmitting layer may also be composed of a plurality of independent block units, which are thesecond block units 204. Eachsecond block element 204 is a light-transmissive block. Thesecond block unit 204 is provided corresponding to thefirst block unit 203. Each block unit is adhesively connected to an adjacent block unit in the optical axis direction to form aunit assembly 209. Theunit modules 209 are arranged in an array corresponding to thelaser emitter 120, and eachunit module 209 is bonded with theadjacent unit module 209 to form an optical array module.

If the projection apparatus relies on the thirdoptical array 250 to perform the light receiving process, when the thirdoptical array 250 is located between the secondoptical array 240 and the second variable refractive index light-transmittinglayer 260, the firstoptical array 210, the first variable refractive index light-transmittinglayer 220, the diffusive light-transmittinglayer 230 and the secondoptical array 240 located in front of the thirdoptical array 250 are all composed of a plurality of independent block-shaped units, and the plurality of block-shaped units are sequentially bonded along the optical axis direction to form theaforementioned unit assembly 209. When the thirdoptical array 250 is located between the first variable refractive index light-transmittinglayer 220 and the diffusion light-transmittinglayer 230, the block units constituting the firstoptical array 210 and the first variable refractive index light-transmittinglayer 220 are sequentially connected in the optical axis direction to form thefirst unit assembly 209, and the block units constituting the diffusion light-transmittinglayer 230, the secondoptical array 240, the second variable refractive index light-transmittinglayer 260, and the fourthoptical array 270 are sequentially bonded in the optical axis direction to form thesecond unit assembly 209.

The projection device and the light source device thereof provided by the embodiments of the present disclosure are described in detail above, and the principles and embodiments of the present disclosure are explained herein by applying specific examples, and the description of the embodiments above is only used to help understanding the method and the core idea of the present disclosure; meanwhile, for those skilled in the art, according to the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present description should not be construed as a limitation to the present disclosure.

Claims (10)

1. A light source device is characterized by comprising

The laser module comprises a plurality of laser transmitters arranged in an array;

the optical array group comprises a plurality of optical arrays which are sequentially arranged on one side of the laser module along the direction of an optical axis, each optical array comprises a plurality of optical units which are arranged in an array along the direction vertical to the optical axis, and each optical unit is arranged corresponding to the laser transmitter;

the laser emitted by each laser emitter passes through a plurality of optical units corresponding to each other.

2. The light source device of claim 1, wherein the plurality of optical arrays comprise:

the first optical array comprises a plurality of collimating lens units, and each collimating lens unit is arranged corresponding to the laser emitter;

the light source device further comprises at least one light-transmitting layer comprising:

and the first variable-refractive-index light-transmitting layer is arranged on the light emergent side of the first optical array along the optical axis direction.

3. The light source device according to claim 2, wherein the at least one light-transmissive layer further comprises:

and the diffusion euphotic layer is arranged on the light emergent side of the first variable refractive index euphotic layer along the direction of an optical axis.

4. The light source device of claim 3, wherein the plurality of optical arrays further comprises:

the second optical array is arranged on the light emitting side of the diffusion light-transmitting layer along the optical axis direction and comprises a plurality of light homogenizing units, and each light homogenizing unit is arranged corresponding to the laser emitter.

5. The light source device according to claim 3, further comprising:

and the light receiving element is arranged on the light emitting side of the optical array group along the optical axis direction.

6. The light source device according to claim 2, wherein the at least one light-transmitting layer further comprises a second variable-index light-transmitting layer, the plurality of optical arrays further comprises a third optical array and a fourth optical array, and the third optical array, the second variable-index light-transmitting layer and the fourth optical array are arranged in this order on the light-emitting side of the first variable-index light-transmitting layer;

the third optical array comprises a plurality of light spot compression units, and each light spot compression unit is arranged corresponding to the laser emitter; the fourth optical array comprises a plurality of light receiving units, and each light receiving unit is arranged corresponding to the laser emitter.

7. The light source device according to claim 6, wherein the spot compressing unit is provided with a plurality of layers in the optical axis direction.

8. The light source device according to claim 6, wherein the at least one light transmissive layer further comprises a diffusive light transmissive layer disposed on a light exit side of the first variable refractive index light transmissive layer along an optical axis direction, and the third optical array is disposed between the first variable refractive index light transmissive layer and the diffusive light transmissive layer.

9. The light source device according to any one of claims 2 to 8, wherein in the optical axis direction, the optical units of the plurality of optical arrays and the adjacent portions of the light-transmissive layer are integrated into a unit assembly, the plurality of unit assemblies and the plurality of laser emitters are arranged in an array, and two adjacent unit assemblies are connected to each other to form an optical array module.

10. A projection apparatus, comprising a prism set, a spatial light modulator, a lens assembly and the light source device according to any one of claims 1 to 9, wherein the laser emitted from the laser module passes through the optical array set, passes through the prism set, and then is modulated by the spatial light modulator to exit from the lens assembly.

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