CN111352287A

CN111352287A - Light source system and projection equipment

Info

Publication number: CN111352287A
Application number: CN201811581110.6A
Authority: CN
Inventors: 胡飞; 吴超; 余新; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-06-30
Also published as: WO2020135301A1

Abstract

The invention relates to a light source system comprising: at least one part of laser emitted by the laser group is used as primary light of the light source system; and the light homogenizing element is arranged on a laser light emitting path which is emitted by the laser group and is used as the primary light of the light source system, and is used for homogenizing the laser which is used as the primary light of the light source system. The invention also relates to a projection device comprising the light source system.

Description

Light source system and projection equipment

Technical Field

The invention relates to the technical field of optical imaging, in particular to a light source system and projection equipment.

Background

The High Dynamic Range (HDR) projection system can increase the contrast and peak brightness output by the projector, so that the bright field and dark field parts in the picture can display rich gray scale information, thereby greatly improving the picture effect and audience viewing experience. The existing projection system generally adopts a laser light source array as a light source for realizing a high dynamic range, because the laser light source has the characteristics of small divergence angle, high electro-optic conversion efficiency, good monochromaticity and the like, when the central wavelength in the laser light source array has a difference of 3nm, the partition chromatic aberration can be perceived by human eyes, and the central wavelength of the laser light source array can be deviated due to the type selection, the working temperature, the working current and the aging degree of a laser. High dynamic range projection systems therefore require stringent requirements for laser selection and adjustment of operating temperature, operating current and age, thus increasing the complexity of the projection system.

Disclosure of Invention

Accordingly, the present invention is directed to a light source system and a projection apparatus that overcome the above-mentioned problems.

A light source system, comprising:

at least one part of laser emitted by the laser group is used as primary light of the light source system;

the light homogenizing element is arranged on a laser light emitting path which is emitted by the laser group and is used as the primary color light of the light source system, and is used for homogenizing the laser which is used as the primary color light of the light source system; and the first light modulation element is arranged on a light emergent light path of the light homogenizing element and is used for pre-modulating the primary color light emitted by the light homogenizing element according to the content of the image to be projected.

A projection apparatus comprising a light source system and a second light modulation element located on an outgoing light path of the light source system, wherein: the light source system is the light source system described above; the second light modulation element is used for modulating the light emitted by the light source system.

Compared with the prior art, the light source system and the projection equipment formed by the light source system provided by the invention have the advantages that the dodging element is arranged on the light path of the primary color light of the light source system, and the dodging element is used for homogenizing the primary color light to eliminate the condition of inconsistent central wavelengths of the primary color light, so that the light source system does not need to strictly adjust the type selection of a laser, and does not need to strictly adjust the working temperature, the working current and the aging degree, thereby reducing the complexity of the system.

Drawings

Fig. 1 is a schematic structural diagram of a projection apparatus provided in a first embodiment.

Fig. 2 is a schematic structural diagram of a light source system according to a second embodiment.

Fig. 3 is a schematic structural diagram of a projection apparatus provided in a third embodiment.

Fig. 4 is a schematic structural diagram of a projection apparatus provided in a fourth embodiment.

Fig. 5 is a schematic structural diagram of a projection apparatus provided in the fifth embodiment.

Fig. 6 is a schematic structural diagram of a projection apparatus provided in a sixth embodiment.

Description of the main elements

Light source system

100, 100b, 100c, 100d, 100e, 100f

Projection device

200, 400, 500, 600, 700

Laser groups

10, 10b, 10c, 10d, 10e

First laser group 11

Second laser group 12

Lasers

101, 101c, 102, 103

Dodging element 20

First light modulation element 30

Second light modulation element 201

Beam shaping device 40

First relay lens group 45

Wavelength conversion device

50, 50f

Second relay lens group 55

Light splitting device

60, 75, 78, 90, 120, 125

First light directing element 65

Second light directing element 70

Light combining device 80

Control unit 85

Third light directing element 105

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. 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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection apparatus 200 according to a preferred embodiment of the invention. The projection apparatus 200 includes a light source system 100, and a second light modulation element 201 on an optical path of light emitted from the light source system 100. The light source system 100 is used as a light source of the projection apparatus 200 to generate a picture with a high dynamic range. The light source system 100 includes a laser group 10, a light unifying element 20, and a control unit 85.

The laser group 10 comprises a plurality of lasers 101, the plurality of lasers 101 can be arranged in an array of m × n according to the length-width ratio of a projection picture, and at least a part of laser light emitted by the plurality of lasers 101 is used as primary color light of the light source system 100.

In other embodiments, at least a part of the laser light emitted from the laser group 10 is used as the excitation light of the light source system 100, and the power of the emitted laser light is adjustable when the emitted laser light is used as the excitation light.

That is, the plurality of lasers 101 included in the laser group 10 may be divided into two parts, wherein a part of the laser light emitted from the lasers 101 is used as the primary light of the light source system 100, and a part of the laser light emitted from the lasers 101 is used as the excitation light of the light source system 100; alternatively, the laser group emits light serving as the primary light of the light source system 100 and light serving as the excitation light of the light source system 100 in time series (time division).

In the present embodiment, the laser group 10 emits primary color light for the light source system 100 in time series (time division). The primary light emitted by the laser group 10 may include three colors, red, green, and blue. It will be appreciated that the number of lasers emitting each color may be one or more. In the present embodiment, the laser group 10 includes a laser 101 capable of emitting blue light, a laser 102 for red light, and a laser 103 for green light.

The dodging element 20 is disposed on a laser light outgoing path of the primary light of the light source system 100 emitted from the laser group 10, and is configured to dodge the laser light of the primary light of the light source system 100. The light homogenizing element 20 is a square rod. The square rod can be in various cylindrical shapes, and the square rod can be in a hollow cylindrical shape or a solid rod shape. The light unifying element 20 may also be a fly-eye lens assembly. The fly-eye lens assembly comprises a single-piece double fly-eye lens or a double-piece single fly-eye lens.

When the light uniformizing element 20 is a square rod, the light uniformizing element 20 performs multiple reflection and light uniformizing on the light beams entering the light uniformizing element and then emits the light beams, so as to eliminate the situation that the central wavelengths of the primary light beams are not uniform.

When the light uniformizing element 20 is a fly-eye lens assembly, the fly-eye lens assembly emits light again by converging the light beams, and the center wavelengths of the emitted light beams can be consistent.

In the present embodiment, the power of the laser light emitted from the laser group 10 is controlled by the control unit 85 as the excitation light. The control unit 85 is electrically connected to the laser group 10 and the second light modulation element 201, and the control unit 85 is configured to receive original image data of an image to be displayed, generate a light source control signal according to the original image data, control the on/off of each laser of the laser group 10 and the light emission luminance of each laser according to the light source control signal, predict the illuminance distribution of the second light modulation element 201 according to the on/off of each laser and the light emission luminance of each laser, and generate a compensation control signal according to the illuminance index and the original image data. Thus, a Local Dimming (Local Dimming) function of the projection apparatus 200 can be implemented.

As a preferred embodiment, the light source system 100 further includes a first light modulation element 30 located on the light emitting path of the dodging element 20. The first light modulation element 30 is a low resolution LCD panel. The first light modulation element 30 is configured to pre-modulate the primary light emitted by the light uniformizing element 20 according to the content of the image to be projected to realize a light field with a bright-dark distribution, so as to provide a high contrast of a projection picture when the light source system 100 is used as a light source of a projection apparatus.

Note that, when the first light modulation element 30 is located on the optical path of the blue primary light, the first light modulation element 30 may be omitted. Because blue light only provides 7% of brightness in a white field, and the improvement of the image contrast by the pre-modulation of a blue light field is limited, a blue light path can also directly utilize a uniform blue light field without pre-modulation, so that the first light modulation element 30 is omitted, and the complexity of an optical system and projection equipment is reduced.

In the present embodiment, since the laser group 10 includes the laser 101 capable of emitting blue light, the laser 102 for red light, and the laser 103 for green light, and the dodging element 20 is disposed on the optical path of only one color in order to simplify the configuration of the projection apparatus 200, the light source system 100 further includes the light guide element 115, the light splitting device (Dichroic Mirror)120, and the light splitting device 125 in order to dodge the primary color light of different colors.

Specifically, a light guide element 115 is provided on the light outgoing path of the laser 103 capable of emitting green light, and a beam splitter 120 and a beam splitter 125 are provided on the light paths of the blue laser 101 and the red laser 102, respectively. The light guide element 115 guides the primary green light to the light splitting device 120, the light splitting device 120 is capable of transmitting green and reflecting red, and the light splitting device 125 is capable of transmitting blue and reflecting yellow.

The light uniformizing element 20 is disposed in the light emitting direction of the light splitting device 125, light beams of different colors emitted by the laser group 10 can enter the light uniformizing element 20 in time sequence, and the light uniformizing element performs light uniformizing on the laser light as the primary color light of the light source system 100 respectively entering the light uniformizing element. The light homogenizing element 20 is a light bar.

The two sides of the dodging element 20 are respectively provided with a convergent lens 21 and a collimating lens group 23. The converging lens 21 guides light emitted from the light splitting device 125 into the light uniformizing element 20, and emits and enters the collimating lens group 23 after being uniformized by the light uniformizing element 20, and then projects the collimated light to the first light modulation element 30 after being collimated by the collimating lens group 23.

The first light modulation element 30 is disposed on the light emitting path of the light uniformizing element 20, and is configured to pre-modulate the primary light emitted by the light uniformizing element 20 according to the content of the image to be projected so as to realize a light field with light and dark distribution. The first light modulation element 30 is a low resolution LCD panel.

The light combining device 80 is further disposed on the light outgoing path of the first light modulation element 30.

The second light modulation element 201 may be an LCD (Liquid Crystal Display), an LCOS (Liquid Crystal on Silicon, also called Liquid Crystal on Silicon), a DMD (Digital micro-mirror Device), or the like. The second light modulation element 201 modulates the three colors of light, i.e., red, green and blue, according to a time sequence to obtain three color images, the three color images enter the light combining device 80, and the light combining device 80 combines the three color images to form a projection image with a high dynamic range.

Fig. 2 is a schematic structural diagram of a light source system 100b according to a second embodiment of the present invention. The second embodiment provides a light source system 100b including a laser group 10b and a light unifying element 20.

In the present embodiment, the laser beams emitted from the laser group 10b are all used as the primary light of the light source system. The laser group 10b includes a plurality of lasers capable of emitting three primary color beams, i.e., red, green, and blue beams. In the present embodiment, the laser group 10b can emit primary colors of three colors at the same time. The number of lasers of each color can be set according to actual needs.

The light paths of the red, green and blue lights are respectively provided with the light uniformizing elements 20, that is, the red, green and blue lights respectively pass through the three light uniformizing elements 20. It will be appreciated that a converging lens 21 and a collimating lens group 23 may also be provided at each end of each dodging element 20 to ensure that light emitted from the laser enters said dodging element 20.

A first light modulation element 30 is respectively arranged on the light emergent path of each dodging element 20. The primary lights with different colors are respectively incident to the first light modulation element 30 for pre-modulation to realize a light field with light and dark distribution.

When the light source system 100b is used to form a projection apparatus, a second light modulation element (not shown) is also disposed in the light outgoing direction of the light source system 100 b.

Specifically, the red, green and blue lights respectively pass through the dodging of the corresponding dodging element 20, and each of the first light modulation elements 30 is used for modulating the primary light emitted from the dodging element 20 to form image light. A reflecting element and a light splitting element are arranged in the light emitting direction of the first light modulation element 30, which is similar to the light path arrangement between the laser group 10 and the condensing lens 21 in the first embodiment, so that red, green and blue light can enter the second light modulation element according to a time sequence, and the second light modulation element is used for further modulating image light. The second light modulation element and the first light modulation element 30 form a dual spatial light modulator, and the contrast of the image of the projection device can be greatly improved after the modulation of the dual spatial light modulator. The resolution finally modulated by the projection device is determined by the resolution of the image modulated by the second light modulation element, and generally, the resolution of the image modulated by the first light modulation element is less than or equal to the resolution of the image modulated by the second spatial light modulation element.

Of course, after the modulation of the first light modulation element 30, it is not limited to only setting one second light modulation element, but a second light modulation element (not shown) may be set in the light emitting direction of the image light of each color, each second light modulation element is used to further modulate the image light of the corresponding color, and the images are superimposed to obtain a projection picture with a high dynamic range, so that three pieces of second spatial light modulation elements are required.

Or combining two colors of image light, arranging a second light modulation element for further modulating the two colors of image light, arranging a second light modulation element on the light-emitting path of the other color of image light for further modulating the single color of image light, and finally obtaining a high-dynamic-range projection picture after image superposition, thus needing a two-piece second spatial light modulation element.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a projection apparatus 400 according to a third embodiment of the present invention. The projection device 400 also comprises a light source system 100c and a second light modulation element 201 positioned in the light exit path of the light source system 100 c.

In the present embodiment, the light source system 100c includes, in addition to the laser group 10c and the dodging element 20, the light source system 100c further includes a beam shaping device 40, a first relay lens group 45, a wavelength conversion device 50, a second relay lens group 55, a light splitting device 60, a first light guide element 65, a second light guide element 70, a light splitting device 75, and a light combining device 80.

In the present embodiment, the laser group 10c can emit the primary color light and the excitation light as the light source system 100a in time series. In the present embodiment, the laser group 10c is used to emit blue primary light.

Because blue light only provides 7% of brightness in a white field, and the improvement of the image contrast by the pre-modulation of the blue light field is limited, the blue light path can also directly utilize a uniform blue light field without pre-modulation, and at the moment, the light source system 100c does not comprise the first light modulation element 30, so that the complexity of an optical system and projection equipment is reduced.

It can be understood that, when providing a high contrast of a projection picture, the first light modulation element 30 may be further disposed on the light exit path of the light uniformizing element 20, so that the first light modulation element 30 pre-modulates the primary light emitted by the light uniformizing element 20 according to the content of the image to be projected to realize a light field with a bright-dark distribution.

The beam shaping device 40 is located on the light exit path of the laser group 10 c. The beam shaping device 40 comprises a square rod array formed by a plurality of square rods or a waveguide array formed by a plurality of waveguides. Each laser 101 in the laser array formed by the laser group 10 corresponds to each square rod in the square rod array one by one; or each laser 101 in the laser array formed by the laser group 10c corresponds to each waveguide in the waveguide array. The primary light emitted by the laser group 10c is an array spot with an elliptical or circular gaussian distribution. The beam shaping device 40 is used for shaping the elliptical or circular gaussian spots emitted by the laser group 10 into rectangular spots with fixed intervals. In this embodiment, the beam shaper 40 is a square rod array.

The first relay lens group 45 is disposed in the light outgoing direction of the beam shaping device 40. The first relay lens group 45 is composed of one or more convex lenses and/or one or more concave lenses. In the present embodiment, the first relay lens group 45 is composed of two plano-convex lenses, the convex surfaces of which are disposed in directions away from each other. The first relay lens group 45 is used for relaying the light spot emitted from the beam shaping device 40 to the wavelength conversion device 50.

The wavelength conversion device 50 is located on the light exit path of the beam shaping device 40. The wavelength conversion device 50 is a transmissive wavelength conversion device and includes a conversion region and a scattering region, the conversion region is configured to convert the excitation light into at least a first color light and transmit the first color light, and the scattering region is configured to scatter the primary color light and emit the primary color light. The wavelength conversion device 50 may be circular, and the conversion region and the scattering region are respectively distributed in a fan shape.

The driving device drives the wavelength conversion device 50 to periodically move, so that the conversion region and the scattering region are alternately located on the light path of the primary light and the excitation light, when the light emitted by the laser group 10c is emitted to the conversion region, the light emitted from the conversion region is used as the excitation light, and when the light emitted by the laser group 10c is emitted to the scattering region, the emitted light is used as the primary light of the light source system, so that the laser group 10c can emit the excitation light used as the light source system 100 and the primary light of the light source system according to the time sequence.

The conversion region of the wavelength conversion device 50 is described as forming a yellow wavelength conversion material by way of example. The wavelength conversion material may be a phosphor, a phosphorescent material, or a quantum dot. The monochromatic light relayed to the wavelength conversion device 50 by the first relay lens group 45 is blue light, and the light emitted after the blue light is absorbed by the conversion region of the wavelength conversion device 50 is composite light of two other colors except the blue light in the three primary colors of RGB, that is, the first color light is composite light of red light and green light, that is, yellow light. And the blue light is emitted after being scattered by the scattering region.

In other embodiments, if the laser group 10c emits red light and the wavelength conversion device 50 has a cyan phosphor formed thereon, the first color light emitted after the red light is absorbed by the wavelength conversion device 50 is a composite light of the blue light and the green light, i.e., cyan light. If the laser group 10c emits green light and the wavelength conversion device 50 is formed with magenta phosphor, the first color light emitted by the green light relayed by the first relay lens group 45 to the wavelength conversion device 50 after being absorbed by the wavelength conversion device 50 is the composite light of red light and blue light, i.e., magenta.

In one embodiment, the conversion region of the wavelength conversion device 50 is provided with wavelength conversion materials for generating red stimulated light and green stimulated light, respectively. Under the driving of the driving device, the red wavelength conversion material, the green wavelength conversion material and the scattering region on the surface of the wavelength conversion device are periodically located on the light path of the excitation light, and the wavelength conversion device 50 periodically emits red light, green light and scattered blue excitation light.

Of course, the present invention is not limited thereto, and the tricolor light forming the image of the projection apparatus may be obtained through the wavelength conversion device 50.

The second relay lens group 55 is disposed in the light outgoing direction on the wavelength conversion device 50. The second relay lens group 55 has the same structure as the first relay lens group 45. The second relay lens group 55 is configured to collimate the light spot emitted from the wavelength conversion device 50 and relay the light spot onto the light splitting device 60.

The light splitting device 60 transmits the first color light after the wavelength range is changed by the wavelength conversion device 50 and reflects the excitation light transmitted from the scattering region of the wavelength conversion device 50. The spectroscopic device 60 is a device formed by plating a multilayer dielectric film on a transparent substrate. The selective plating of dielectric films of different thicknesses and different refractive indices allows transmission of light in a desired wavelength range and reflection of light in another wavelength range. In the present embodiment, the light splitting device 60 may be configured as a film that transmits yellow light and reflects blue light.

A first light guiding element 65 is disposed on the reflected light path of the light splitting device 60, and the first light guiding element 65 is configured to reflect the light beam reflected by the light splitting device 60. In the present embodiment, blue primary light is reflected.

The dodging element 20 is disposed in the light emitting direction of the first light guiding element 65, that is, in the optical path of the primary light, and performs dodging on the primary light so that the light center wavelengths of the blue light emitted from the dodging element 20 are consistent.

The first light modulation element 30 is still disposed in the light emitting direction of the light uniformizing element 20, and is configured to pre-modulate the primary color light emitted by the light uniformizing element 20 according to the content of the image to be projected so as to realize a light field with bright and dark distribution. The first light modulation element 30 is a low resolution LCD panel, and it is understood that the first light modulation element 30 can be omitted since the light emitted from the dodging element 20 is blue light.

The second light guiding element 70 is disposed in the light outgoing path of the first light modulation element 30, and is configured to change the propagation direction of the light beam incident on the surface thereof by 90 degrees and then emit the light beam.

In the present embodiment, the light source device further includes a condenser lens 21 and a collimator lens group 23, which are disposed between the first and second

light guide elements

65 and 70 and at both ends of the dodging element 20. The converging lens 21 guides the light emitted from the first light guiding element 65 into the dodging element 20, emits the light after being dodged by the dodging element 20, enters the collimating lens group 23, and projects the light after being collimated by the collimating lens group 23 to the first light modulation element 30.

The light splitting device 75 is disposed on the light emitting path of the second light guiding element 70, and the light splitting device 75 has the same structure as the light splitting device 60 and can also transmit yellow light and reflect blue light.

The second light modulation element 201 is configured to receive the yellow light and the reflected blue light emitted by the light splitting device 75, modulate the yellow light and the reflected blue light, combine the modulated blue light and the combined light by the light combining device 80, and emit the combined light to form a projection image with a high dynamic range.

Fig. 4 is a schematic structural diagram of a projection apparatus 500 according to a fourth embodiment of the present invention. The projection apparatus 500 includes a light source system 100d, and a second light modulation element 201 located on an optical path of light emitted from the light source system 100 d.

The light source system 100d provided in the fourth embodiment also includes the laser group 10d, and the dodging element 20 and the first light modulation element 30 are disposed on the optical path of the primary light. In the present embodiment, the light source system 100d includes a laser group 10d, a dodging element 20, a first light modulation element 30, and the light source system 100d further includes a beam shaping device 40, a beam splitting device 90, a first relay lens group 45, a wavelength conversion device 50, a second relay lens group 55, a beam splitting device 75, a second light guide element 70, a third light guide element 105, a light combining device 80, and a control unit 85.

In the present embodiment, the laser group 10 emitting blue light will be described as an example.

The beam shaping device 40 is disposed in the light-exiting path of the laser group 10 d. The beam shaping device 40 comprises a square rod array formed by a plurality of square rods or a waveguide array formed by a plurality of waveguides. Each laser 101 in the light source array formed by the laser group 10 corresponds to each square rod in the square rod array one by one; or each laser 101 in the light source array formed by the laser group 10d corresponds to each waveguide in the waveguide array. The emitted laser light is shaped by the beam shaping device 40, and then enters the light splitting device 90 to generate the primary light and the excitation light emitted along different optical paths.

In this embodiment, the light splitting device 90 is an area diaphragm, and the area diaphragm includes a first area and a second area, the first area is used for guiding a part of the laser light emitted by the laser group 10d to transmit along a first optical path to obtain the excitation light, and the second area is used for guiding another part of the laser light emitted by the laser group 10d to transmit along a second optical path to obtain the primary light.

The first relay lens group 45, the wavelength conversion device 50, the second relay lens group 55, and the light splitting device 75 are sequentially disposed on the optical path of the excitation light, that is, the light outgoing path of the light splitting device 90. The transmission manner of the light beam from the first relay lens assembly 45 to the light splitting device 75 is the same as that of the fourth embodiment, and is not described herein again.

The light guided by the second region of the light splitting device 90, i.e. the primary light, reaches the third light directing element 105. The dodging element 20, the first light modulation element 30, and the second light guide element 70 are sequentially disposed on the light outgoing path of the third light guide element 105. The second light guiding element 70 is parallel to the light splitting device 75, the second light guiding element 70 is configured to guide the light pre-modulated by the first light modulation element 30 to the light splitting device 75, and the light splitting device 75 transmits yellow and reflects blue, so that the light splitting device 75 can guide the stimulated light and the blue primary color light to the second light modulation element 201.

The second light modulation element 201 is configured to receive the light transmitted and reflected by the light splitting device 75, guide the light to be modulated, combine the light by the light combining device 80, and emit the light to form a projection image with a high dynamic range.

Fig. 5 is a projection apparatus 600 according to a fifth embodiment of the present invention. The fifth embodiment also provides a projection apparatus 600 including a light source system 100e and a second light modulation element 201. The light source system 100e includes, in addition to: the laser group 10e, the dodging element 20, and the first optical modulator 30 further include a beam shaping device 40, a first relay lens group 45, a wavelength conversion device 50, a second relay lens group 55, a second light guide element 70, a light splitting device 75, a light combining device 80, and a control unit 85.

The present embodiment is different from the fourth embodiment in that the laser group 10e includes a first laser group 11 and a second laser group 12. The light emitted from the first laser group 11 is used as the excitation light of the light source system 100e, and the light emitted from the second laser group 12 is used as the primary light of the light source system 100 e.

Specifically, the excitation light emitted from the first laser group 11 is used to excite the wavelength conversion material on the wavelength conversion device 50 to generate the excited light, and the laser light emitted from the second laser group 12 is used as the primary light of the light source system 100 e. In the present embodiment, the first laser group 11 and the second laser group 12 are both configured to emit blue laser light, but it is understood that the spectral curves of the blue laser light emitted from the first laser group 11 and the second laser group 12 do not overlap, that is, the blue laser light emitted from the first laser group 11 and the second laser group 12 is metameric light, and the conversion efficiency of the wavelength conversion device 50 and the color coordinates of the blue primary light emitted from the light source system 100e are compatible. The number of lasers included in the first laser group 11 and the number of lasers included in the second laser group 12 may be the same or different.

The beam shaping device 40, the first relay lens group 45, the wavelength conversion device 50, the second relay lens group 55, and the beam splitting device 75 are disposed on the light outgoing path of the first laser group 11. The wavelength conversion device 50 is a transmissive wavelength conversion device.

The dodging element 20, the first light modulation element 30, and the second light guide element 70 are disposed on the light outgoing path of the second laser group 12.

The optical components included in projection apparatus 600 are numbered the same as the optical components of projection apparatus 500 and represent the same operating principles. That is, the light emitted from the first laser group 11 is shaped by the beam shaping device 40 and relayed to the wavelength conversion device 50 to generate the stimulated light, and the stimulated light is transmitted through the light splitting device 75 to reach the light combining device 80. Since the stimulated light is fluorescence, the consistency of the central wavelength of the lasers in the laser array is not required, and the dodging element 20 is not required to be arranged on the optical path of the lasers.

The primary light emitted by the second laser group 12 is homogenized by the light homogenizing element 20 to eliminate the central wavelength inconsistency of the primary light, and then is modulated by the first light modulation element 30 and then enters the second light guide element 70, and the second light guide element 70 reflects the light beam to the light splitting device 75, and finally enters the second light modulation element 201 after being reflected by the light splitting device 75.

The light beams reflected and transmitted by the light splitting device 75 enter the second light modulation element 201 in time sequence, and are modulated by the second light modulation element 201, then are combined by the light combining device 80, and are emitted to form a projection picture with a high dynamic range. Since the light emitted from the second laser group 12 is blue-base light, the first light modulation element 30 can be omitted.

In one embodiment, the second laser group 12 emits red laser light or green laser light as the primary light of the light source system 100e, and the second laser group 12 passes through the dodging device 20 and the first light modulation device 30 in sequence and then enters the second light guide device 70, where the first light modulation device 30 is used for pre-modulating the red laser light or the green laser light and cannot be omitted. In addition, the wavelength conversion device 50 is further provided with a scattering region corresponding to the wavelength conversion device to emit the scattered blue excitation light, and the scattered blue excitation light needs to pass through the dodging element 20 and then enter the second light modulation element 201.

Referring to fig. 6, fig. 6 is a projection apparatus 700 according to a sixth embodiment of the present invention, where the projection apparatus 700 includes a light source system 100f and a second light modulation element 201. The light source system 100f includes: a laser group 10e, a dodging element 20, a first optical modulation element 30, a beam shaping device 40, a first relay lens group 45, a wavelength conversion device 50f, a second relay lens group 55, a light splitting device 75, a light splitting device 78, a light combining device 80, and a control unit 85.

However, in the present embodiment, the wavelength conversion device 50f is a reflection type wavelength conversion device.

Taking the example that the first and second laser groups 11 and 12 both emit blue light, the operation principle of the projection apparatus 700 according to the sixth embodiment is as follows: the blue light beam emitted from the first laser group 11 is shaped by the beam shaping device 40 to form rectangular light spots with a predetermined interval, and enters the first relay lens group 45, the first relay lens group 45 relays the received blue light spot to the light splitting device 75, the light splitting device 75 is a blue-light-transmitting and yellow-light-reflecting membrane, so that the blue light beam emitted from the first laser group 11 is transmitted from the light splitting device 75 to the second relay lens group 55, is collimated by the second relay lens group 55 and then relayed to the wavelength conversion device 50f, the wavelength conversion device 50f absorbs the blue light spot, changes the wavelength range and emits yellow light, the yellow light spot is relayed by the second relay lens group 55, and is reflected by the light splitting device 75 and then enters the light splitting device 78, the light splitting device 78 is a blue-light-reflecting and yellow-light-transmitting membrane, so that, the yellow light can be transmitted from the light splitting device 78 into the second light modulation element 201.

The light emitted by the second laser group 12 is used as the primary light of the light source system 100f, and reaches the light splitting device 78 through the dodging of the dodging element 20 and the pre-modulation of the first light modulation element 30, and the light splitting device 78 reflects the blue light and guides the blue light to the second light modulation element 201.

The light transmitted and reflected from the light splitting device 78 is modulated by the second light modulation element 201, and finally, the light is combined by the light combining device 80 and emitted, thereby forming a projection screen with a high dynamic range.

In summary, in the light source system 100 and the projection apparatus 200 formed by the light source system 100 provided by the present invention, the light homogenizing element 20 is disposed on the light path of the primary light of the light source system 100, and the primary light is homogenized by the light homogenizing element 20 to eliminate the situation of the non-uniform central wavelength of the primary light, so that the light source system 100 of the present invention does not need to strictly adjust the type of the laser, nor strictly adjust the working temperature, the working current and the aging degree, thereby reducing the complexity of the system.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units or means recited in the apparatus claims may also be embodied by one and the same item or means in software or hardware.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A light source system, comprising:

the light homogenizing element is arranged on a laser light emitting path which is emitted by the laser group and is used as the primary color light of the light source system, and is used for homogenizing the laser which is used as the primary color light of the light source system; and

the first light modulation element is arranged on a light emitting path of the light homogenizing element and is used for pre-modulating the primary color light emitted by the light homogenizing element according to the content of the image to be projected.

2. The light source system according to claim 1, wherein at least a part of the laser light emitted from the laser group is used as excitation light of the light source system, and the power of the emitted laser light is adjustable when the emitted laser light is used as the excitation light.

3. The light source system of claim 2, wherein the laser group comprises a plurality of lasers, and the lasers emit the primary light and the excitation light in time sequence.

4. The light source system according to claim 2, wherein the laser group includes a plurality of lasers, and a part of the plurality of lasers is used for emitting primary light and another part is used for emitting excitation light as the light source system.

5. The light source system of claim 1, wherein the laser light emitted from the laser group as the primary light comprises three colors of red, green and blue.

6. The light source system of claim 2, further comprising a control unit electrically connected to the set of lasers, the control unit adjusting the power of the lasers emitting as excitation light according to the image to be projected.

7. The light source system according to claim 2, wherein the light source system comprises a wavelength conversion device located on an optical path of light emitted from the laser group, the wavelength conversion device comprises a conversion region and a scattering region, the conversion region is configured to convert the excitation light into at least first color light, and the scattering region is configured to scatter the primary color light and emit the primary color light.

8. The light source system according to claim 2, wherein the light source system comprises a light splitting device, and the laser light emitted from the laser group generates the primary color light and the excitation light emitted along different optical paths after passing through the light splitting device.

9. The light source system of claim 8, wherein the light splitting device is an area diaphragm, the area diaphragm includes a first area and a second area, the first area is used for guiding a portion of the laser light emitted by the laser group to transmit along a first optical path to obtain the excitation light, and the second area is used for guiding another portion of the laser light emitted by the laser group to transmit along a second optical path to obtain the primary light.

10. The light source system of claim 1, wherein the first light modulation element is an LCD panel.

11. The light source system according to claim 2, wherein a beam shaping device is disposed on an optical path of the excitation light; the beam shaping device comprises shaping units which are arranged in an array mode, and the shaping units correspond to the lasers one to one.

12. The light source system of claim 2, wherein the laser group is a blue laser group, and the excitation light and the primary light are both blue light; at this time, the first light modulation element is not included in the light source system.

13. A projection apparatus comprising a light source system and a second light modulation element located on an outgoing light path of the light source system, wherein: the light source system is the light source system as claimed in any one of claims 1 to 12; the second light modulation element is used for modulating the light emitted by the light source system.