CN211786560U - Illumination system and projection device - Google Patents

Abstract

The utility model provides an illumination system for provide the illumination beam. The illumination system comprises a blue light laser module, a green light laser module, a red light laser module and a wavelength conversion element, wherein the blue light laser module, the green light laser module and the red light laser module are respectively used for providing blue light beams, green light beams and red light beams. The wavelength conversion element has a wavelength conversion region and an optical output region. In the first time interval, the blue light beams, the green light beams and the red light beams are sequentially transmitted to the optical output area, wherein the illumination light beams comprise the blue light beams, the green light beams and the red light beams. During a second time interval, the blue light beam is transmitted to the wavelength conversion region to form a converted light beam, wherein the illumination light beam comprises the converted light beam. A projection device comprising the illumination system is also provided. Use the utility model discloses an illumination system's projection arrangement has the color performance of lower cost and wide colour gamut.

Description

Illumination system and projection device

Technical Field

The utility model discloses an illumination system and projection arrangement.

Background

With the advancement of technology, projectors are used in a large number of applications in life, for example, they can be used in different places such as indoors, movie theaters, outdoors, etc. However, as users demand more and more projection apparatuses, the image quality of the image screen of the projector is more and more demanded.

In a conventional projector structure, the excitation light source, the fluorescent wheel and the filtering color wheel are used for projecting color lights with different colors in different time sequences, but because the structure emits yellow light by exciting the fluorescent powder and filters the yellow light out green light and red light by the filtering color wheel, the structure can only generate part of green color lights with narrow frequency bands, the visible light has low color gamut coverage rate, the green light has high consumption degree, the color of the green light is not good and the efficiency is low.

In another conventional projector architecture, the red, green and blue laser diode arrays are used to project color lights of different colors in different time sequences, and although the high visible light color gamut coverage can be achieved, the number of green diodes used is large, and the cost is high.

In addition, in the projector architecture, a diffusion wheel is additionally arranged on the laser light path to solve the problem of laser facula, but the cost is high.

The background section is only provided to aid in understanding the present invention, and therefore the disclosure in the background section may include some prior art that does not constitute a part of the knowledge of those skilled in the art. The disclosure in the "background" section does not represent that matter or the problems which may be solved by one or more embodiments of the present invention are known or appreciated by those skilled in the art prior to the filing of the present application.

SUMMERY OF THE UTILITY MODEL

An embodiment of the present invention provides an illumination system, which can make a projection apparatus using the illumination system have a good color performance.

An embodiment of the utility model provides a projection device, it has good color expression.

Other objects and advantages of the present invention can be obtained from the technical features disclosed in the present invention.

In order to achieve one or a part of or all of the above objectives or other objectives, in an embodiment of the present invention, an illumination system for providing an illumination beam includes a blue laser module, a green laser module, a red laser module, and a wavelength conversion element. The blue laser module is used for providing a blue light beam. The green laser module is used for providing a green light beam. The red laser module is used for providing a red light beam. The wavelength conversion element has a wavelength conversion region and an optical output region. In the first time interval, the blue light beam, the green light beam and the red light beam are sequentially transmitted to the optical output area, wherein the illumination light beam comprises the blue light beam, the green light beam and the red light beam. During a second time interval, the blue light beam is passed to the wavelength conversion region to form a converted light beam, wherein the illumination beam comprises the converted light beam.

In order to achieve one or a part of or all of the above objectives or other objectives, an embodiment of the present invention provides a projection apparatus, which includes the illumination system, the light valve and the projection lens. The light valve is arranged on the transmission path of the illumination light beam and converts the illumination light beam into an image light beam. The projection lens is arranged on a transmission path of the image light beam.

Based on the foregoing, in the embodiment of the utility model provides an among lighting system and the projection arrangement, adopted blue light, green glow, ruddiness laser module and wavelength conversion component's comprehensive optics framework, compared in prior art, because the utility model discloses a green glow source is more (from green glow laser module and wavelength conversion component), and consequently the quantity of green glow light emitting component in the green glow laser module can reduce the use, and perhaps the luminous intensity of the green glow beam that the green glow laser module provided can reduce, but can make the whole illuminating beam who provides of lighting system maintain the same luminous intensity at the green glow wave band, and lighting system and projection arrangement and then can lower cost's mode reach the color expression of wide colour gamut.

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A to fig. 1C are schematic diagrams of light paths of a first to a third sub-time intervals of a projection apparatus in a first time interval according to an embodiment of the present invention.

Fig. 1D is a schematic optical path diagram of the projection apparatus in fig. 1A to 1C in a second time interval.

Fig. 2A is a schematic top view of a wavelength conversion element of the projection apparatus in fig. 1A to 1D.

Fig. 2B is a schematic cross-sectional view taken along line a-a' in fig. 2A.

Fig. 3 is a timing diagram of different elements in a projection apparatus according to various embodiments of the present invention.

Fig. 4A to 4C are schematic optical path diagrams of the projection apparatus in the first to third sub-time intervals of the first time interval according to another embodiment of the present invention.

Fig. 4D is a schematic optical path diagram of the projection apparatus in fig. 4A to 4C in a second time interval.

Fig. 5A to 5C are schematic optical path diagrams of a first to third sub-time intervals of a projection apparatus in a first time interval according to another embodiment of the present invention.

Fig. 5D is a schematic optical path diagram of the projection apparatus in fig. 5A to 5C in a second time interval.

Fig. 6A is a schematic top view of the wavelength conversion element of the projection apparatus in fig. 5A to 5D.

Fig. 6B is a schematic cross-sectional view taken along line B-B' in fig. 6A.

Fig. 6C is a schematic cross-sectional view taken along line C-C' in fig. 6A.

FIG. 7 is a timing diagram of different elements in a projection apparatus according to various embodiments of the present invention

Fig. 8A to 8C are schematic optical path diagrams of a first to third sub-time intervals of a projection apparatus in a first time interval according to still another embodiment of the present invention.

Fig. 8D is a schematic optical path diagram of the projection apparatus in fig. 8A to 8C in a second time interval.

List of reference numerals

100. 100a to 100 c: lighting system

110: blue light laser module

120: green laser module

130: red laser module

140. 140 b: wavelength conversion element

142: rotary disc

144: wavelength conversion material

146: rotating shaft

148: light transmission element

148': reflective element

149: optical adjusting structure

150. 150b 1: half-wave delay element

150b 2: quarter-wave delay element

160. 160a, 160 c: first light splitting element

170: second light splitting element

180: third light splitting element

190: controller

200. 200a to 200 c: projection device

210: light uniformizing element

220: light valve

230: projection lens

A-A ', B-B ', C-C ': line segment

BB. BB1, BB 2: blue light beam

C1-C4, C4 b: lens and lens assembly

CB: converting a light beam

CL1, CL 2: focusing lens

GB: green beam

HTR: transflective element

IB: illuminating light beam

IMB: image light beam

ST 1-ST 3: first to third sub-time intervals

T1: a first time interval

T2: second time interval

RB: red light beam

M1, M2: reflecting mirror

NT: gap

OA: optical prism group

OOR, OORb: optical output area

WCR: a wavelength conversion region.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1A to fig. 1C are schematic diagrams of light paths of a first to a third sub-time intervals of a projection apparatus in a first time interval according to an embodiment of the present invention. Fig. 1D is a schematic optical path diagram of the projection apparatus in fig. 1A to 1C in a second time interval. Fig. 2A is a schematic top view of a wavelength conversion element of the projection apparatus in fig. 1A to 1D. Fig. 2B is a schematic cross-sectional view taken along line a-a' in fig. 2A.

Referring to fig. 1A to fig. 1D, in the present embodiment, a projection apparatus 200 includes an illumination system 100, a light uniformizing element 210, a light valve 220, and a projection lens 230. Illumination system 100 is configured to provide illumination beam IB and includes blue laser module 110, green laser module 120, red laser module 130, wavelength conversion element 140, half-wavelength retardation element 150, first beam splitting element 160, second beam splitting element 170, third beam splitting element 180, and controller 190. The above elements are described in detail in the following paragraphs.

First, the elements in the illumination system 100 will be described.

The Laser module may be an array formed by arranging one or more Laser light emitting elements, or an optical element assembly formed by one or more Laser light emitting elements, such as Laser Diodes (LDs), a reflector or a lens, but the present invention is not limited thereto. In the present embodiment, one or more blue laser light emitting devices capable of emitting blue light are disposed in the blue laser module 110 to provide the blue light beam BB, and the Peak Wavelength (Peak Wavelength) of the blue light beam BB is, for example, 455 nanometers (nm), but not limited thereto. The green laser module 120 is provided with one or more green laser emitting devices for emitting green light to provide a green light beam GB having a peak wavelength of, for example, 525 nm, but not limited thereto. The red laser module 130 is provided with one or more red laser emitting devices capable of emitting red light for providing a red light beam RB, and the peak wavelength thereof is, for example, 638 nm, but not limited thereto. The peak wavelength is defined as the wavelength corresponding to the maximum light intensity in the light intensity spectrum. In addition, the blue light beam BB, the green light beam GB, and the red light beam RB are narrow-band light, that is, the Full width at half maximum (FWHM) of the light intensity spectrum is less than or equal to 25 nm.

In the present embodiment, the wavelength conversion device 140 is an optical device, and the main function of the optical device is to convert the short wavelength light beam passing through the wavelength conversion device 140 into a long wavelength light beam relative to the short wavelength light beam. Referring to fig. 2A and 2B, the wavelength conversion element 140 is, for example, a transmission fluorescent color wheel (phosphor wheel). The wavelength conversion element 140 includes a turntable 142, a wavelength conversion material 144, a rotation axis 146, a light transmissive element 148, and an optical tuning structure 149. The rotating disc 142 has a notch NT and is coupled to the rotating shaft 146. The wavelength conversion material 144 is disposed on the turntable 142, and the wavelength conversion material 144 is, for example, a photoluminescent material, which includes, but is not limited to, phosphor or quantum dots. The notch NT and the wavelength conversion material 144 form an annular region together in a top view. The light-transmitting element 148 is embedded in the notch NT, and is made of a material with a high light-transmitting coefficient, such as glass. The central angle of the wavelength converting material 144 relative to the center of the annular region is less than the central angle of the optically transmissive element 148 relative to the center of the annular region. When the wavelength conversion material 144 is irradiated by the short wavelength light beam, a photoluminescence phenomenon is generated to emit a long wavelength light beam (wavelength conversion), and a region defined by the wavelength conversion material 144 is also referred to as a wavelength conversion region WCR, on the other hand, a region defined by the light transmissive element 148 is capable of being transmitted by the light beam and outputting without wavelength conversion, and is also referred to as an optical output region OOR (or a light transmissive region, a non-wavelength conversion region). The optical adjustment structure 149 is, for example, a structure capable of adjusting the properties of the light beam, and is disposed on the light-transmitting element 148. In the present embodiment, the optical adjustment structure 149 includes, but is not limited to, a structure capable of scattering light beams. Further, for example, scattering particles may be doped in the light-transmitting element 148, or a surface microstructure may be disposed on the surface of the light-transmitting element 148 to form a rough surface, so as to achieve the effect of scattering the light beam.

The retardation element (also called wave plate, phase retardation plate) has different refractive indexes to the beams with different polarization directions, so that the beams with different polarization directions incident on the retardation element have different propagation velocities, and to introduce a phase difference between the beams with different polarization directions, the skilled person can introduce different phase differences by controlling the material type and thickness, the present invention is not limited by material and thickness. In the present embodiment, the retardation element is, for example, a half-wave retardation element 150, which can make the light beams passing through the retardation element have 1/2 phases different from each other in different polarization directions.

The spectroscopic element generally refers to an optical element having a spectroscopic function. In the embodiment, the light splitting element is a Dichroic Mirror (DM), which has wavelength selectivity and is a color splitting plate for splitting light by wavelength/color, but is not limited thereto. In the present embodiment, the first light splitting element 160 is designed to reflect yellow light, red light and green light and transmit other color light, the second light splitting element 170 is designed to reflect green light and transmit other color light, and the third light splitting element 180 is designed to reflect blue light and transmit other color light.

The controller 190 is coupled to the blue laser module 110, the green laser module 120, and the red laser module 130, and is used to control whether the laser modules 110 to 130 emit light or not. The controller 190 may be a calculator, a Microprocessor (MCU), a Central Processing Unit (CPU), or other Programmable controller (Microprocessor), a Digital Signal Processor (DSP), a Programmable controller, an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), or the like, but the invention is not limited thereto.

Next, other elements in the projection device 200 are described.

The light uniformizing element 210 is an optical element that can uniformize the light beam passing through the light uniformizing element 210. In the present embodiment, the light uniformizing element 210 is, for example, but not limited to, an integrating Rod (Integration Rod), a lens array, or other optical elements with light uniformizing effect.

The light valve 220 refers to any one of a Digital Micro-mirror Device (DMD), a Liquid-crystal-on-silicon (LCOS) Panel, or a Liquid-crystal Panel (LCD), but is not limited thereto. In the present embodiment, the light valve 220 is a digital micromirror device.

The projection lens 230 is, for example, a combination including one or more optical lenses having diopter, and the optical lenses include, for example, various combinations of non-planar lenses such as a biconcave lens, a biconvex lens, a meniscus lens, a convex-concave lens, a plano-convex lens, and a plano-concave lens. The present invention is not limited to the type and kind of the projection lens 230.

In addition, in the present embodiment, one or more reflectors M1, M2 and lenses C1 to C4 may be optionally added to the illumination system 100 to adjust the optical path. On the other hand, the optical prism group OA can be optionally added inside the projection apparatus 200 to adjust the optical path.

The arrangement of the above elements will be described in detail in the following paragraphs.

Referring to fig. 1A to 1D, in the present embodiment, the blue laser module 110 is disposed on one side of the wavelength conversion element 140, and the green laser module 120 and the red laser module 130 are disposed on the other side of the wavelength conversion element 140. The blue laser module 110 is disposed opposite to the red laser module 130, and the green laser module 120 is disposed at one side of both the blue laser module 110 and the red laser module 130. The wavelength conversion element 140 is disposed on the transmission paths of the blue light beam BB, the green light beam GB, and the red light beam RB. The first light splitting element 160, the second light splitting element 170, and the third light splitting element 180 are used to guide the light beam inside the illumination system 100. The first light splitting element 160 is disposed between the blue laser module 120 and the wavelength conversion element 140, and the first light splitting element 160 is used for guiding the blue light beam BB to be transmitted to the wavelength conversion element 140. The second light splitting element 170 is disposed between the green laser module 120 and the red laser module 130, and the second light splitting element 170 is used to guide the green light beam GB and the red light beam RB to be transmitted to the wavelength conversion element 140. The third light splitting element 180 is disposed between the wavelength conversion element 140 and the green laser module 120 and the red laser module 130, and the third light splitting element 180 is used to guide the green light beam GB and the red light beam RB to be transmitted to the wavelength conversion element 140. Further, the second light splitting element 170 and the third light splitting element 180 are disposed in an area between the green laser module 120, the red laser module 130 and the wavelength conversion element 140. In more detail, the second light splitting element 170 is disposed in an area between the third light splitting element 180, the green laser module 120 and the red laser module 130, and the third light splitting element 180 is disposed in an area between the wavelength conversion element 140 and the second light splitting element 170. Referring to fig. 2A and 2B, the half-wavelength retardation element 150 is disposed on the surface of the light transmissive element 148, i.e., is correspondingly disposed in the optical output area OOR.

Fig. 3 is a timing diagram of different elements in a projection apparatus according to various embodiments of the present invention. The horizontal axis of fig. 3 represents time.

Referring to fig. 1A to fig. 1C and fig. 3, in the first time interval T1, the illumination system 100 sequentially outputs the red light beam RB, the green light beam GB, and the blue light beam BB. The first time interval T1 is further divided into first to third sub-time intervals ST1 to ST3 according to the output of the color lights with different colors, wherein the illumination system 100 outputs the red light beam RB, the green light beam GB, and the blue light beam BB in the first, second, and third sub-time intervals ST1 to ST3, respectively. The following paragraphs will be provided with reference to fig. 1A to 1D and fig. 3 to describe the optical effects of the illumination system 100 of the present embodiment in detail.

Referring to fig. 1A, fig. 2A and fig. 3, in the first sub-time interval ST1, the blue laser module 110 and the green laser module 120 are controlled by the controller 190 to be turned off, and the red laser module 130 is controlled by the controller 190 to emit the red light beam RB. At this time, the wavelength conversion element 140 rotates with the rotation shaft 146 to make the transparent element 148 enter the optical path of the red light beam RB. After the red light beam RB is emitted, the red light beam RB sequentially passes through the second light splitting element 170, the third light splitting element 180, the lenses C1, C2, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the half-wavelength retardation element 150, the lenses C3, and C4, and is reflected by the first light splitting element 160 to be emitted to the illumination system 100. The illumination beam IB output by the illumination system 100 during the first sub-time interval ST1 comprises the red light beam RB.

Referring to fig. 1B, fig. 2A and fig. 3, in the second sub-time interval ST2, the blue laser module 110 and the red laser module 130 are controlled by the controller 190 to be turned off, and the green laser module 120 is controlled by the controller 190 to emit the green light beam GB. At this time, the wavelength conversion element 140 rotates due to the rotation shaft 146, so that the light-transmitting element 148 enters the optical path of the green light beam GB. When the green light beam GB is emitted, the green light beam GB is reflected by the second light splitting element 170 and transmitted to the third light splitting element 180, and sequentially passes through the third light splitting element 180, the lenses C1, C2, the light transmitting element 148 (and is scattered by the optical adjustment structure 149 in the light transmitting element 148), the half-wavelength retardation element 150, the lenses C3, and C4, and is reflected by the first light splitting element 160 to be emitted out of the illumination system 100. Illumination beam IB output by illumination system 100 during second sub-interval ST2 comprises green beam GB.

Referring to fig. 1C, fig. 2A and fig. 3, in the third sub-time interval ST3, the green laser module 120 and the red laser module 130 are controlled by the controller 190 to be turned off, and the blue laser module 110 is controlled by the controller 190 to emit the blue light beam BB. At this time, the wavelength conversion element 140 rotates with the rotation shaft 146 to make the light transmission element 148 enter the optical path of the blue light beam BB. When the blue light beam BB is emitted, the blue light beam BB enters and penetrates the first light splitting element 160 in the incident direction, then sequentially penetrates the lenses C4, C3, the half-wavelength retardation element 150, the light transmitting element 148 (and is scattered by the optical adjustment structure 149 in the light transmitting element 148), the lenses C2, C1, is reflected by the third light splitting element 180 and transmitted to the mirror M1, and then sequentially reflected by the mirrors M1, M2, and is transmitted to the first light splitting element 160 in the direction different from the incident direction and penetrates the first light splitting element 160 to be emitted out of the illumination system 100. The illumination light beam IB output by the illumination system 100 in the third sub-time interval ST3 comprises the blue light beam BB.

Referring to fig. 1D, fig. 2A and fig. 3, in the second time interval T2, the green laser module 120 and the red laser module 130 are controlled by the controller 190 to be turned off, and the blue laser module 110 is controlled by the controller 190 to emit the blue light beam BB. At this time, the wavelength conversion element 140 rotates due to the rotation shaft 146 thereof to make the wavelength conversion material 144 enter the optical path of the blue light beam BB. When the blue light beam BB is emitted, the blue light beam BB sequentially passes through the first light splitting element 160, the lenses C3, and C4 and is transmitted to the wavelength conversion material 144, and the wavelength conversion material 144 is irradiated by the blue light beam BB to be excited into a converted light beam CB, wherein the converted light beam CB is, for example, a yellow light beam. The converted light beam CB is transmitted to the first light splitting element 160 and then reflected by the first light splitting element to exit the illumination system 100. The illumination beam IB output by the illumination system 100 during the second time interval T2 comprises the converted beam CB.

Referring to fig. 1A to fig. 1D, after the illumination beam IB is output from the illumination system 100, the illumination beam IB is transmitted to the light uniformizing element 210, is uniformized by the light uniformizing element 210, and is guided to the light valve 220 by the optical prism group OA, that is, the light valve 220 is disposed on the transmission path of the illumination beam IB. Referring to fig. 3, the light valve 220 converts the illumination beam IB with different colors into the image beam IMB with different colors in different time intervals. More specifically, during the first, second and third sub-time intervals ST 1-ST 3 and the second time interval T2, the light valve 220 receives a red, green, blue and yellow image control signal to convert the illumination beam IB into the red, green, blue and yellow image beams IMB, respectively. The image beam IMB is transmitted to the projection lens 230 through the optical prism assembly OA, that is, the projection lens 230 is disposed on the transmission path of the image beam IMB. The projection lens 230 transmits the image beam IMB to a projection medium (e.g., a projection screen or a wall surface).

Referring to fig. 1A to fig. 1C, fig. 2A and fig. 2B, since the blue, red and green light beams BB, RB and GB all pass through the optical output region OOR defined by the light-transmitting element 148, and the optical output region OOR is provided with the optical adjustment structure 149 (e.g., a scattering structure), the problem of Speckle (Speckle) can be eliminated. Moreover, since the half-wave retardation element 150 is correspondingly disposed in the optical output area OOR, it can delay the phases of the blue, red, green light beams BB, RB, GB passing through the optical output area OOR by 1/2 phase differences, thereby eliminating the problem of picture heterochrosis.

In view of the above, in the illumination system 100 and the projection apparatus 200 of the present embodiment, a comprehensive optical architecture of the wavelength conversion element 140, and the blue laser module 110, the green laser module 120, and the red laser module 130 capable of emitting the blue light beam BB, the green light beam GB, and the red light beam RB, respectively, is adopted. In the first time interval T1, the blue light beams BB, GB, and RB emitted by the blue laser module 110, the green laser module 120, and the red laser module 130 are sequentially transmitted to the optical output region OOR (the light penetration region, the light transmission element 148) of the wavelength conversion element 140, wherein the illumination light beam IB in this time interval T1 includes the blue light beam BB, the green light beam GB, and the red light beam RB. During the second time interval T2, the blue light beam BB passes through the wavelength conversion region WCR defined by the wavelength conversion material 144 of the wavelength conversion element 140 and excites the wavelength conversion material 144 to form the converted light beam CB, wherein the illumination light beam IB of the time interval T2 includes the converted light beam CB (e.g., a yellow light beam, which can be one of the sources of green light). From the above optical behaviors, the green light of the illumination system 100 and the green light of the projection apparatus 200 come from both the green laser module 120 and the wavelength conversion element 140, and the green light sources of the illumination system 100 and the projection apparatus 200 are more than those of the prior art, so that the illumination system 100 and the projection apparatus 200 can reduce the number of green light emitting elements in the green laser module 120 or reduce the light intensity of the green light beam GB provided by the green laser module 120, but the illumination light beam IB provided by the illumination system 100 as a whole can maintain the same light intensity in the green light band, and thus, the illumination system 100 and the projection apparatus 200 can achieve the color gamut specifications of high visible light color gamut coverage of the DCI-P3 and rec.2020 at lower cost.

Moreover, since the wavelength conversion element 140 is disposed on the transmission path of the blue light beam BB, the green light beam GB, and the red light beam RB, if the user wants to adjust the blue light beam BB, the green light beam GB, and the red light beam RB, the optical adjustment function can be integrated into the optical output region OOR of the wavelength conversion element 140 (in the above embodiment, for example, the scattering particles or the surface microstructures are disposed on the light transmissive element 148, or the half-wavelength retardation element 150 is disposed on the light transmissive element 148), and there is no need to add other optical adjustment/modification elements on the optical path, so as to reduce the cost.

It should be noted that, the following embodiments follow the contents of the foregoing embodiments, descriptions of the same technical contents are omitted, reference may be made to the contents of the foregoing embodiments for the same element names, and repeated descriptions of the following embodiments are omitted.

Fig. 4A to 4C are schematic optical path diagrams of the projection apparatus in the first to third sub-time intervals of the first time interval according to another embodiment of the present invention. Fig. 4D is a schematic optical path diagram of the projection apparatus in fig. 4A to 4C in a second time interval.

Referring to fig. 4A to 4D, the projection apparatus 200a and the illumination system 100a of fig. 4A to 4D are substantially similar to the projection apparatus 200 and the illumination system 100 of fig. 1A to 1D, and the main differences are: the position of the component and the ability of the light splitting component to reflect (or to be penetrated) the light beam are slightly different, specifically, the dodging component 210 is disposed opposite to the red laser module 130, and the green laser module 120 and the blue laser module 110 are disposed on two opposite sides (left and right sides) of the red laser module 130 respectively. The first light splitting element 160a is designed to reflect blue light and transmit other color light.

Fig. 4A to 4D are combined in the following paragraphs to illustrate the optical behavior difference between the projection apparatus 200a and the projection apparatus 200. It should be noted that only the optical behavior difference is described in the following paragraphs, and the actions of other elements can be referred to fig. 1A to 1D.

Referring to fig. 4A and fig. 3, in the first sub-time interval ST1, after the red light beam RB is emitted, the red light beam RB sequentially passes through the second light splitting element 170, the third light splitting element 180, the lenses C1, C2, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the half-wavelength retardation element 150, the lenses C3, C4, and the first light splitting element 160a to be emitted to the illumination system 100 a. Illumination beam IB output by illumination system 100a during first sub-interval ST1 comprises red beam RB.

Referring to fig. 4B and fig. 3, in the second sub-time interval ST2, after the green light beam GB is emitted, the green light beam GB is reflected by the second light splitting element 170 and transmitted to the third light splitting element 180, and sequentially passes through the third light splitting element 180, the lenses C1, C2, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the half-wavelength retardation element 150, the lenses C3, C4, and the first light splitting element 160a, so as to be emitted to the illumination system 100 a. Illumination beam IB output by illumination system 100a during second sub-interval ST2 comprises green beam GB.

Referring to fig. 4C and fig. 3, in the third sub-time interval ST3, after the blue light beam BB is emitted, the blue light beam BB enters the first light splitting element 160a in the incident direction and is reflected by the first light splitting element 160a, and sequentially passes through the lenses C4, C3, the half-wavelength retardation element 150, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the lenses C2, and C1, and is reflected by the third light splitting element 180, and is sequentially reflected by the mirrors M1 and M2, and then is transmitted to the first light splitting element 160a in the direction different from the incident direction and is reflected by the first light splitting element 160a to be emitted out of the illumination system 100 a. The illumination light beam IB output by the illumination system 100a in the third sub-time interval ST3 comprises the blue light beam BB.

Referring to fig. 4D and fig. 3, in the second time interval T2, after the blue light beam BB is emitted, the blue light beam BB is reflected by the first light splitting element 160a, and sequentially passes through the lenses C4 and C3 to be transmitted to the wavelength conversion material 144, and the wavelength conversion material 144 is irradiated by the blue light beam BB to be excited into the converted light beam CB. The converted light beam CB further penetrates the first light splitting element 160a to exit the illumination system 100 a. The illumination beam IB output by the illumination system 100a during the second time interval T2 comprises the converted beam CB.

The optical path of the illumination beam IB emitted from the illumination system 100a in fig. 4A to 4D is the same as the description of the projection apparatus 200 in fig. 1A to 1D, and is not repeated herein.

Fig. 5A to 5C are schematic optical path diagrams of a first to third sub-time intervals of a projection apparatus in a first time interval according to another embodiment of the present invention. Fig. 5D is a schematic optical path diagram of the projection apparatus in fig. 5A to 5C in a second time interval. Fig. 6A is a schematic top view of the wavelength conversion element of the projection apparatus in fig. 5A to 5D. Fig. 6B is a schematic cross-sectional view taken along line B-B' in fig. 6A. Fig. 6C is a schematic cross-sectional view taken along line C-C' in fig. 6A.

Referring to fig. 5A to 5D, fig. 6A, fig. 6B and fig. 6C, the projection apparatus 200B and the illumination system 100B of fig. 5A to 5D are substantially similar to the projection apparatus 200 and the illumination system 100 of fig. 1A to 1D, and the main differences are: in the projection apparatus 200b and the illumination system 100b of the present embodiment, the wavelength conversion element 140b is, for example, a reflective fluorescent color wheel. The lens C4b is a focusing lens CL 1. The illumination system 100b further includes a transflective element HTR disposed between the blue laser module 110 and the wavelength conversion element 140b, the quarter-wave retardation element 150b2, and another focusing lens CL2, wherein the transflective element HTR is an optical element capable of reflecting a portion of the blue light beam transmitted to the transflective element HTR and transmitting a portion of the blue light beam. On the other hand, the optical actuation principle of the quarter-wave retarding element 150b2 is similar to that of the half-wave retarding element 150b1, with the difference that: the different polarization direction beams passing through this quarter-wave retarding element 150b2 can be made 1/4 phase different. In addition, the illumination system 100b of the present embodiment employs one reflector M1 in number.

In detail, as shown in fig. 6A, 6B and 6C, the wavelength conversion element 140B further includes a reflective element 148' compared to the wavelength conversion element 140. The reflective element 148 'and the transparent element 148 are embedded in the notch NT, wherein the half-wavelength retardation element 150b1 is disposed on the surface of the transparent element 148, and the quarter-wavelength retardation element 150b2 is disposed on the surface of the reflective element 148'. When the wavelength conversion material 144 is irradiated by a short wavelength light beam, a photoluminescence phenomenon is generated to emit a long wavelength light beam (wavelength conversion), this region is also referred to as a wavelength conversion region WCR, the region defined by the light transmissive element 148 can be penetrated by the light beam to make the light beam output the wavelength conversion element 140b (this region is also referred to as a light penetration region), and the region defined by the reflective element 148 'can reflect the light beam to make the light beam output the wavelength conversion element 140b (this region is also referred to as a light reflection region), so the region defined by the light transmissive element 148 and the reflective element 148' is also referred to as an optical output region OORb, i.e. the optical output region OORb includes a light penetration region, a light reflection region, a half-wavelength retardation element 150b1 and a quarter-wavelength retardation element 150b2, which are correspondingly disposed in the optical output region OORb. In addition, in other embodiments not shown, the turntable 142 can extend to the light reflection region, and the reflection element 148' can be a reflection coating or a reflection film disposed on the turntable 142, as long as the effect of reflecting the light beam can be achieved. The half-transmissive half-reflective element HTR is connected to one end of the first light splitting element 160, and the focusing lens CL1 is located between the element formed by connecting the half-transmissive half-reflective element HTR to the first light splitting element 160 and the wavelength conversion element 140 b. The mirror M1 is disposed downstream of the half-transmissive half-reflective element HTR in the optical path, and since light is transmitted from upstream to downstream of the optical path, the optical path downstream of an element can be understood as the portion of the optical path after the light passes through the element. The focusing lens CL2 is disposed near the light exit of the illumination system 100 b. In the present embodiment, the optical adjustment structure 149 is preferably disposed only on the light-transmitting element 148 and not disposed on the reflective element 148'. However, in other embodiments, the optical adjustment structure 149 may still be disposed on the reflective element 148 ', but since when the optical adjustment structure 149 includes a structure capable of scattering the light beam, the light beam incident on the reflective element 148 ' may be too much divergent under the influence of the optical adjustment structure 149, and thus cannot be smoothly incident on the transflective element HTR, in this case, it must be considered that the optical adjustment structure 149 disposed on the reflective element 148 ' cannot make the light beam too much divergent, for example, the haze caused by the optical adjustment structure 149 cannot be too much, so as to avoid the influence of the deviation between the subsequent optical path and the predetermined optical path on the overall optical effect.

Fig. 7 is a timing diagram of different elements in a projection apparatus according to various embodiments of the present invention. The unit of the horizontal axis of fig. 7 is time.

Fig. 5A to 5D and fig. 7 are used together to describe the optical behavior and element actuation differences between the projection apparatus 200b and the projection apparatus 200.

Referring to fig. 5A, fig. 6A and fig. 7, in the first sub-time interval ST1, the wavelength conversion element 140b makes the light transmissive element 148 enter the light path of the red light beam RB due to the rotation of the rotating shaft 146. When the red light beam RB is emitted, the red light beam RB sequentially passes through the second beam splitter 170, the lenses C1, C2, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the half-wavelength retarder 150b1, the lens C3, and the focusing lens CL1, is reflected by the first beam splitter 160, passes through the focusing lens CL2, and then exits the illumination system 100 b. Illumination beam IB output by illumination system 100b during first sub-interval ST1 comprises red beam RB.

Referring to fig. 5B, fig. 6A and fig. 7, in the second sub-time interval ST2, the wavelength conversion element 140B makes the transparent element 148 enter the light path of the green light beam GB due to the rotation of the rotating shaft 146. When the green light beam GB is emitted, the green light beam GB is reflected by the second light splitting element 170, sequentially passes through the lenses C1, C2, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the half-wavelength retardation element 150b1, the lens C3, and the focusing lens CL1, is reflected by the first light splitting element 160, passes through the focusing lens CL2, and then exits the illumination system 100 b. Illumination beam IB output by illumination system 100b during second sub-interval ST2 comprises green beam GB.

Referring to fig. 5C, fig. 6A and fig. 7, in the third sub-time interval ST3, the wavelength conversion element 140b makes the reflection element 148' enter the optical path of the blue light beam BB due to the rotation of the rotation shaft 146. When the blue light beam BB is emitted, the blue light beam BB penetrates the first light splitting element 160, enters the focusing lens CL1 from one side of the focusing lens CL1, penetrates the lens C3, passes through the quarter-wavelength retardation element 150b2, and is transmitted to the reflection element 148 'of the wavelength conversion element 140b, and the reflection element 148' reflects the blue light beam BB. The reflected blue light beam BB penetrates the lens C3 again, and enters the focusing lens CL1 from the other side of the focusing lens CL1 to exit the focusing lens CL1, and is transmitted to the transflective element HTR. The half-transmissive half-reflective element HTR reflects a part of the blue light beam BB 1. On the other hand, a part of the blue light beam BB2 penetrates through the half-transmissive and half-reflective element HTR, is reflected by the mirror M1, and then penetrates through the first light splitting element 160, wherein the energies of the blue light beams BB1 and BB2 are substantially the same, and the optical paths of the blue light beam BB1 reflected by the half-transmissive and half-reflective element HTR and the blue light beam BB2 reflected by the mirror M1 and then penetrating through the first light splitting element 160 are substantially symmetrical with respect to the optical axis of the focusing lens CL2, so that the image provided by the projection apparatus 200b has better color uniformity. The blue light beams BB1 and BB2 are focused by the focusing lens CL2 and then emitted to the illumination system 100 b. The illumination light beam IB output by the illumination system 100b in the third sub-time interval ST3 comprises the blue light beam BB.

Referring to fig. 5D, fig. 6A and fig. 7, in the second time interval T2, the wavelength conversion element 140b makes the wavelength conversion material 144 enter the optical path of the blue light beam BB due to the rotation of the rotating shaft 146. When the blue light beam BB is emitted, the blue light beam BB penetrates the first light splitting element 160, enters the focusing lens CL1 from one side of the focusing lens CL1, penetrates the lens C3, and is transmitted to the wavelength conversion material 144 of the wavelength conversion element 140b, and the wavelength conversion material 144 is irradiated by the blue light beam BB to be excited into a conversion light beam CB, wherein the conversion light beam CB is, for example, a yellow light beam. The converted light beam CB is transmitted to the first light splitting element 160, reflected by the first light splitting element, penetrates the focusing lens CL2, and then exits the illumination system 100 b. The illumination beam IB output by the illumination system 100b during the second time interval T2 comprises the converted beam CB.

Referring to fig. 5A to 5C, fig. 6A, fig. 6B and fig. 6C again, since the blue, red and green light beams BB, RB and GB all pass through the optical output area OORb defined by the light-transmitting element 148 and the reflecting element 148', and the optical output area OORb is provided with the half-wavelength retardation element 150B1 and the quarter-wavelength retardation element 150B2, which can delay the phase of the blue light beam BB passing through the optical output area OORb by 1/4 phase differences, and thus the phase of the red light beam RB and the green light beam GB passing through the optical output area OORb by 1/2 phase differences, the problem of picture heterochromatic can be eliminated.

The optical path of the illumination beam IB emitted from the illumination system 100b in fig. 5A to 5D is the same as the description of the projection apparatus 200 in fig. 1A to 1D, and is not repeated herein.

Fig. 8A to 8C are schematic optical path diagrams of a first to third sub-time intervals of a projection apparatus in a first time interval according to still another embodiment of the present invention. Fig. 8D is a schematic optical path diagram of the projection apparatus in fig. 8A to 8C in a second time interval.

Referring to fig. 8A to 8D, the projection apparatus 200c and the illumination system 100c of fig. 8A to 8D are substantially similar to the projection apparatus 200b and the illumination system 100b of fig. 5A to 5D, and the main differences are: the position of the component is arranged and the capacity of the light splitting component to reflect (or be penetrated by) the light beam is slightly different. In detail, in the projection apparatus 200c and the illumination system 100c of the present embodiment, the light uniformizing element 210 and the red laser module 130 are disposed opposite to each other, and the green laser module 120 and the blue laser module 110 are disposed on two opposite sides of the red laser module 130, respectively. The first light splitting element 160c is designed to reflect blue light and transmit other color light. The first light splitting element 160c is separated from the half-transmissive half-reflective element HTR, and the two elements are disposed parallel to each other. The focusing lens CL1 is located between the transflective element HTR and the first light splitting element 160c and the wavelength conversion element 140 b.

The following paragraphs will be accompanied with fig. 8A to 8D, fig. 6A and fig. 7 to illustrate the optical behavior differences between the projection apparatuses 200b of the projection apparatus 200 c.

Referring to fig. 8A, fig. 6A and fig. 7, in the first sub-time interval ST1, the wavelength conversion element 140b makes the light transmissive element 148 enter the light path of the red light beam RB due to the rotation of the rotating shaft 146. After the red light beam RB is emitted, the red light beam RB sequentially passes through the second beam splitter 170, the lenses C1, C2, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the half-wavelength retardation element 150, the lens C3, the focusing lenses CL1, and the focusing lens CL2 to be emitted to the illumination system 100C. In some embodiments, depending on the arrangement angles of the transflective element HTR and the first light splitting element 160c, the red light beam RB may pass through the transflective element HTR and/or the first light splitting element 160c before being emitted from the focusing lens CL1 to be transmitted to the focusing lens CL 2. Illumination beam IB output by illumination system 100c during first sub-interval ST1 comprises red beam RB.

Referring to fig. 8B, fig. 6A and fig. 7, in the second sub-time interval ST2, the wavelength conversion element 140B makes the transparent element 148 enter the light path of the green light beam GB due to the rotation of the rotating shaft 146. After the green light beam GB is emitted, the green light beam GB is reflected by the second beam splitting element 170 and sequentially passes through the lenses C1, C2, the transparent element 148 (and is scattered by the optical adjustment structure 149 in the transparent element 148), the half-wavelength retardation element 150, the lens C3, the focusing lens CL1, and the focusing lens CL2, so as to be emitted to the illumination system 100C. In some embodiments, depending on the arrangement angles of the transflective element HTR and the first light splitting element 160c, the green light beam GB may pass through the transflective element HTR and/or the first light splitting element 160c before being emitted from the focusing lens CL1 to be transmitted to the focusing lens CL 2. Illumination beam IB output by illumination system 100c during second sub-interval ST2 comprises green beam GB.

Referring to fig. 8C, fig. 6A and fig. 7, in the third sub-time interval ST3, the wavelength conversion element 140b makes the reflection element 148' enter the optical path of the blue light beam BB due to the rotation of the rotation shaft 146. When the blue light beam BB is emitted, the blue light beam BB is reflected by the first light splitting element 160C, enters the focusing lens CL1 from one side of the focusing lens CL1, passes through the lens C3, and is transmitted to the reflective element 148 'of the wavelength conversion element 140b, and the reflective element 148' reflects the blue light beam BB. The reflected blue light beam BB penetrates the lens C3 again, and enters the focusing lens CL1 from the other side of the focusing lens CL1 to exit the focusing lens CL1, and is transmitted to the transflective element HTR. At this time, the transflective element HTR reflects a part of the blue light beam BB1 to the first light splitting element 160c, and is reflected by the first light splitting element 160c and transmitted to the side of the focusing lens CL 2. On the other hand, a part of the blue light beam BB2 passes through the half-transmissive half-reflective element HTR and then passes to the other side of the focusing lens CL 2. The energies of the blue light beams BB1 and BB2 are substantially the same, and the light paths of the blue light beam BB1 reflected by the first light splitting element 160c and the blue light beam BB2 transmitted through the half-transmissive half-reflective element HTR are substantially symmetrical with respect to the optical axis of the focusing lens CL2, so that the image provided by the projection apparatus 200b has better color uniformity. The blue light beams BB1 and BB2 are focused by the focusing lens CL2 and then emitted to the illumination system 100 c. The illumination light beam IB output by the illumination system 100c in the third sub-time interval ST3 comprises blue light beams BB1, BB 2.

Referring to fig. 8D, fig. 6A and fig. 7, in the second time interval T2, the wavelength conversion element 140b makes the wavelength conversion material 144 enter the optical path of the blue light beam BB due to the rotation of the rotating shaft 146. When the blue light beam BB is emitted, the blue light beam BB is reflected by the first light splitting element 160C, enters the focusing lens CL1 from one side of the focusing lens CL1, passes through the lens C3, and is transmitted to the wavelength conversion material 144 of the wavelength conversion element 140b, and the wavelength conversion material 144 is irradiated by the blue light beam BB to be excited into a converted light beam CB, wherein the converted light beam CB is, for example, a yellow light beam. The converted light beam CB passes through the focusing lens CL2 and exits the illumination system 100 c. The illumination beam IB output by the illumination system 100b during the second time interval T2 comprises the converted beam CB.

The optical path of the illumination beam IB emitted from the illumination system 100c in fig. 8A to 8D is the same as the description of the projection apparatus 200 in fig. 1A to 1D, and is not repeated herein.

It should be noted that, in the above embodiments, the arrangement of the first, second, and third light splitting elements and their corresponding capability of reflecting or transmitting color light are satisfied in the same manner as the color light timing chart shown in fig. 3 or fig. 7 and the optical configuration of the projection apparatus. Those skilled in the art can select the number of the light splitting elements and the capability of reflecting the corresponding color light according to the color timing chart shown in fig. 3 or fig. 7 and the optical configuration of the projection apparatus, but the invention is not limited thereto.

In conclusion, in the embodiment of the utility model provides an among lighting system and the projection arrangement, adopted blue light, green glow, ruddiness laser module and wavelength conversion component's comprehensive optics framework, compared in prior art, because the utility model discloses a green glow source is more (from green glow laser module and wavelength conversion component), therefore the quantity of green glow light emitting component in the green glow laser module can reduce the use, perhaps the luminous intensity of the green glow light beam that the green glow laser module provided can reduce, but can make the whole illuminating beam who provides of lighting system maintain the same luminous intensity at the green glow wave band, lighting system and projection arrangement and then can reach the color expression of wide colour gamut by lower cost's mode. Moreover, because the wavelength conversion element is arranged on the transmission path of the blue light, green light and red light beams emitted by the blue light, green light and red light laser modules, if a user wants to perform further light beam modification on the blue light, green light and red light beams, the function of optical modification can be directly integrated into the wavelength conversion element, so that the use of the element is saved, and the system complexity and the manufacturing cost are further reduced.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the contents of the specification should be included in the scope of the present invention. Furthermore, it is not necessary for any embodiment or claim of the invention to achieve all of the objects, advantages, or features disclosed herein. Furthermore, the abstract and the title of the specification are provided only for assisting the retrieval of patent documents and are not intended to limit the scope of the present invention. Furthermore, the terms "first", "second", and the like in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Claims (20)

1. An illumination system for providing an illumination beam, the illumination system comprising a blue laser module, a green laser module, a red laser module, and a wavelength conversion element, wherein the blue laser module is configured to provide a blue beam;

the green laser module is used for providing a green light beam;

the red laser module is used for providing a red light beam;

the wavelength converting element has a wavelength converting region and an optical output region,

wherein the content of the first and second substances,

in a first time interval, the blue light beam, the green light beam and the red light beam are sequentially transmitted to the optical output area, wherein the illumination light beam comprises the blue light beam, the green light beam and the red light beam;

during a second time interval, the blue light beam passes to the wavelength conversion region to form a converted light beam, wherein the illumination beam comprises the converted light beam.

2. The illumination system of claim 1, wherein the optical output region is provided with an optical adjustment structure.

3. The illumination system of claim 1, further comprising a half-wavelength retarding element disposed in correspondence with the optical output region.

4. The illumination system of claim 1, further comprising a quarter-wave retarding element disposed in correspondence with the optical output region.

5. The illumination system of claim 1, wherein the optical output region is a light transmissive region through which the blue light beam, the green light beam and the red light beam sequentially pass.

6. The illumination system of claim 1, wherein the optical output region further comprises a light reflecting region and a light transmitting region, wherein,

the blue light beam is transmitted to the light reflection area to be reflected by the light reflection area;

the green light beam and the red light beam are sequentially transmitted to the light penetration region to penetrate the light penetration region.

7. The illumination system of claim 6, further comprising a focusing lens, wherein,

the blue light beam enters the focusing lens from one side of the focusing lens and is transmitted to the light reflection area,

the light reflection area reflects the blue light beam to the other side of the focusing lens so as to be emitted out of the focusing lens.

8. The illumination system of claim 1, further comprising a first light splitting element and a second light splitting element, wherein,

the first light splitting element is arranged between the blue laser module and the wavelength conversion element and used for guiding the blue light beam to be transmitted to the wavelength conversion element;

the second light splitting element is arranged between the green laser module and the red laser module and used for guiding the green light beams and the red light beams to be transmitted to the wavelength conversion element.

9. The lighting system, as set forth in claim 8, further comprising:

and the third light splitting element is arranged between the wavelength conversion element and the green laser module and between the wavelength conversion element and the red laser module, and is used for guiding the green light beams and the red light beams to be transmitted to the wavelength conversion element.

10. The illumination system of claim 8, further comprising a semi-transmissive semi-reflective element disposed between the blue laser module and the wavelength conversion element.

11. The illumination system of claim 10, wherein the first light splitting element is coupled to the transflective element.

12. The illumination system of claim 10, wherein the first light splitting element is separate from the transflective element.

13. A projection device comprises an illumination system, a light valve and a projection lens, wherein the illumination system is used for providing an illumination beam, the illumination system comprises a blue laser module, a green laser module, a red laser module and a wavelength conversion element, wherein,

the blue laser module is used for providing a blue light beam;

the green laser module is used for providing a green light beam;

the red laser module is used for providing a red light beam;

the wavelength converting element has a wavelength converting region and an optical output region, wherein,

in a first time interval, the blue light beam, the green light beam and the red light beam are sequentially transmitted to the optical output area, wherein the illumination light beam comprises the blue light beam, the green light beam and the red light beam;

during a second time interval, the blue light beam passes to the wavelength conversion region to form a converted light beam, wherein the illumination beam comprises the converted light beam;

the light valve is arranged on the transmission path of the illumination light beam and converts the illumination light beam into an image light beam;

the projection lens is arranged on a transmission path of the image light beam.

14. A projection device according to claim 13, wherein said optical output area is provided with optical adjustment structures.

15. The projection device of claim 13, further comprising a half-wavelength retarding element disposed in correspondence with the optical output area.

16. The projection device of claim 13, further comprising a quarter-wave retarding element disposed in correspondence with the optical output region.

17. The projection apparatus of claim 13, wherein the optical output region is a light transmissive region, and the blue light beam, the green light beam and the red light beam sequentially transmit through the light transmissive region.

18. The projection device of claim 13, wherein the optical output region further comprises a light reflecting region and a light transmitting region, wherein,

the blue light beam is transmitted to the light reflection area to be reflected by the light reflection area;

the green light beam and the red light beam are sequentially transmitted to the light penetration region to penetrate the light penetration region.

19. The projection device of claim 18, further comprising a focusing lens, wherein,

the blue light beam enters the focusing lens from one side of the focusing lens and is transmitted to the light reflection area,

the light reflection area reflects the blue light beam to the other side of the focusing lens so as to be emitted out of the focusing lens.

20. The projection device of claim 13, wherein the projection device further comprises a first light splitting element and a second light splitting element,

the first light splitting element is arranged between the blue laser module and the wavelength conversion element and used for guiding the blue light beam to be transmitted to the wavelength conversion element;

the second light splitting element is arranged between the green laser module and the red laser module and used for guiding the green light beams and the red light beams to be transmitted to the wavelength conversion element.

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