TWI656361B - Illumination system and projection apparatus - Google Patents

Abstract

An illumination system includes an excitation light source module, a color separation element, a wavelength conversion element, a light homogenizing element, and a lens array. The excitation light source module includes a plurality of excitation light sources, each of which is adapted to provide an excitation light beam. The dichroic element is adapted to pass the excitation beam to the wavelength conversion element. The wavelength converting element is adapted to convert the excitation beam into a converted beam and to reflect the converted beam to a dichroic element, the dichroic element being adapted to deliver the converted beam to the dodging element. The light homogenizing element is disposed on a transmission path of the converted light beam from the color separation element, and the light homogenizing element has an light incident end. The lens array is disposed on a transmission path of the excitation beam, and the lens array includes a plurality of lens units, and the long sides of the lens units are parallel to the long sides of the light incident end when projected along the transmission path of the converted light beam to the light incident end.

Description

Lighting system and projection device

The present invention relates to a display device, and more particularly to an illumination system and a projection device using the same.

The type of light source used in the projection device evolved from ultra-high pressure mercury lamps (UHP lamps) and light emitting diodes (LEDs) as the market demanded brightness, color saturation, service life, non-toxicity and environmental protection of the projection device. To the laser diode (LD).

In a conventional projection device using a laser diode, the laser diode provides an excitation beam to excite the phosphor layer on the phosphor powder wheel to generate a fluorescent beam, which is then homogenized by a homogenizing element. Fluorescent beam. However, the light incident end of the light homogenizing element is rectangular, and the spot formed by the excitation beam on the phosphor powder wheel is a circular spot, and the excited fluorescent light beam is formed into a circular shape at the light incident end of the light homogenizing element. Spot. Since the shape of the spot formed by the fluorescent light beam at the light incident end does not match the shape of the light incident end, the light utilization efficiency is deteriorated, thereby lowering the brightness of the projection device.

This "Prior Art" section is only intended to aid in understanding the present invention, and thus the disclosure of the prior art may include prior art that is not known to those of ordinary skill in the art. In addition, the content disclosed in the "Prior Art" does not represent the problem to be solved by the content or one or more embodiments of the present invention, nor does it mean that those having ordinary knowledge in the technical field before the application of the present invention Know or recognize.

The invention provides an illumination system which can improve light utilization efficiency.

The invention provides a projection device which can improve light utilization efficiency.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

An illumination system according to an embodiment of the present invention includes an excitation light source module, a dichroic element, a wavelength conversion element, a light homogenizing element, and a lens array. . The excitation light source module includes a plurality of excitation light sources, each of which is adapted to provide an excitation light beam. The color separation element is disposed on the transmission path of the excitation light beam and is adapted to transmit the excitation light beam from the excitation light source module to the wavelength conversion element. The wavelength conversion element is disposed on a transmission path of the excitation beam from the color separation element to convert the excitation beam into a converted beam and to reflect the converted beam to the color separation element, the color separation element being adapted to transmit the converted beam to the light homogenizing element. The light homogenizing element is disposed on a transmission path of the converted light beam from the color separation element, and the light homogenizing element has an light incident end. The lens array is disposed on a transmission path of the excitation beam, and the lens array includes a plurality of lens units, and the long sides of the lens units are parallel to the long sides of the light incident end when projected along the transmission path of the converted light beam to the light incident end.

In order to achieve one or a part or all of the above or other objects, a projection apparatus according to an embodiment of the present invention includes the above illumination system, a light valve, and a projection lens. The illumination system described above is adapted to provide an illumination beam. The light valve is disposed on the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed on the transmission path of the image beam.

In an embodiment of the invention, the lens array is disposed between the excitation light source module and the color separation element.

In an embodiment of the invention, the light incident ends of the lens units and the light homogenizing elements are corresponding rectangles, and the aspect ratio of each lens unit is greater than the aspect ratio of the light incident end of the light homogenizing element.

In an embodiment of the invention, the excitation beam is concentrated by the lens array on the wavelength conversion element and forms an overall spot, and the aspect ratio of each lens unit is equal to the aspect ratio of the excitation beam to the overall spot of the wavelength conversion element.

In an embodiment of the invention, the aspect ratio of the excitation spot concentrating on the entire wavelength spot of the wavelength conversion element is greater than the aspect ratio of the spot of the conversion beam to the wavelength conversion element, and the length of the overall spot of the excitation beam on the wavelength conversion element. Less than the length of the spot of the converted beam to the wavelength converting element.

In an embodiment of the invention, the illumination system further includes a first concentrating lens, a second concentrating lens, and a third concentrating lens. The first collecting lens is disposed between the excitation light source module and the lens array. The second collecting lens is disposed between the dichroic element and the wavelength converting element. The third collecting lens is disposed between the dichroic element and the light homogenizing element.

In an embodiment of the invention, the lens array is disposed between the color separation element and the wavelength conversion element.

In an embodiment of the invention, the light incident ends of the lens units and the light homogenizing elements are corresponding rectangles, and the aspect ratio of each lens unit is equal to the aspect ratio of the light incident end of the light homogenizing element.

In an embodiment of the invention, the excitation beam is concentrated by the lens array on the wavelength conversion element and forms an overall spot, and the aspect ratio of each lens unit is equal to the aspect ratio of the excitation beam to the overall spot of the wavelength conversion element.

In an embodiment of the invention, the illumination system further includes a first concentrating lens, a second concentrating lens, and a third concentrating lens. The first concentrating lens is disposed between the excitation light source module and the color separation element. The second concentrating lens is disposed between the lens array and the wavelength conversion element. The third collecting lens is disposed between the dichroic element and the light homogenizing element.

In an embodiment of the invention, the spot of each of the excitation beams on the lens array covers at least two lens units.

In an embodiment of the invention, the excitation light source module includes a plurality of collimating lenses respectively disposed in front of the excitation light source for transmitting the excitation light beam to the color separation element.

In an embodiment of the invention, the wavelength conversion element is adapted to pass a portion of the excitation beam, and the illumination system further comprises a light guiding component, the portion of the excitation beam passing through the wavelength conversion element being guided by the light guiding component And passed to the leveling element.

In an embodiment of the invention, the light-shaping element has a light-emitting end with respect to the light-incident end, and the illumination beam emitted from the light-emitting end is obliquely incident on the light-modulating area of the light valve, and the light-emitting end and the light-modulating area are rectangular, and The aspect ratio of the light exiting end of the light homogenizing element is greater than the aspect ratio of the light modulation area.

According to the present invention, the shape of the spot when the excitation beam emitted from the lens array is irradiated to the wavelength conversion element can be adjusted by using the lens array, so that the spot shape of the converted beam converted by the wavelength conversion element corresponds to the shape of the light incident end of the light homogenizing element, and further Improve light utilization. The projection apparatus according to the embodiment of the present invention can improve light utilization efficiency by using the above illumination system.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

1 is a schematic view of an illumination system in accordance with an embodiment of the present invention. Referring to FIG. 1 and FIG. 2 , the illumination system 100 of the present embodiment includes an excitation light source module 110 , a color separation component 120 , a wavelength conversion component 130 , a light homogenizing component 140 , and a lens array 150 . The excitation light source module 110 includes a plurality of excitation light sources 111, each of which is adapted to provide an excitation light beam L1. The dichroic element 120 is disposed on the transmission path of the excitation light beams L1 and is adapted to pass the excitation light beams L1 from the excitation light source module 110 to the wavelength conversion element 130. The wavelength conversion element 130 is disposed on the transmission path of the excitation light beams L1 from the color separation element 120 to convert the excitation light beams L1 into the converted light beams L2, and reflects the converted light beams L2 to the color separation elements 120, wherein the wavelength of the excitation light beams L1 Unlike the wavelength of the converted light beam L2, the dichroic element 120 is adapted to deliver the converted light beam L2 to the light homogenizing element 140. The light homogenizing element 140 is disposed on a transmission path of the converted light beam L2 from the color separation element 120, and the light homogenizing element 140 has a light incident end 141. In this embodiment, the lens array 150 may be used only in a single group and disposed on the transmission path of the excitation light beam L1, and the lens array 150 includes a plurality of lens units 151.

2 is a schematic view of the light incident end of the light homogenizing element of FIG. 1, and FIG. 3 is a schematic view of a light spot formed by the excitation light beam in the lens array according to an embodiment of the present invention. Referring to FIG. 1 , FIG. 2 and FIG. 3 , in the present embodiment, the long side 151 a of each lens unit 151 is projected along the transmission path of the converted light beam L2 to the light incident end 141 , and the long side 141 b of the light incident end 141 . parallel. Since the lens array 150 will shape the incident excitation beam L1, the excitation beam L1 forms a spot S3 on the lens array 150 and each spot S3 can cover at least two lens units 151, so that the spot of the excitation beam L1 of the exit lens array 150 will be Corresponding to the shape of the lens unit 151, therefore, the long side of the spot of the converted light beam L2 is parallel to the long side 141b of the light incident end 141 at the light incident end 141.

Referring to FIG. 1 and FIG. 3 , in the embodiment, the excitation light source 111 is, for example, a laser light source or other solid state light source, but is not limited thereto. These excitation light sources 111 are, for example, arranged in an array. The number of the excitation light sources 111 of the present embodiment is exemplified by 20, and thus 20 spots S3 are formed on the lens array 150. In addition, the excitation light source module 110 may further include a plurality of collimating lenses 112 respectively disposed in front of the excitation light sources 111, that is, the collimating lenses 112 are located between the excitation light sources 111 and the lens array 150. The lens 112 is adapted to transmit the excitation beam L1 to the dichroic element 120. In another embodiment, the plurality of collimating lenses 112 can also be replaced with a single lens array.

The dichroic element 120 is, for example, a dichroic filter or a dichroic mirror, but is not limited thereto. The dichroic element 120 is adapted to pass the excitation beam L1 (eg, a blue beam) and reflect the converted beam L2 (eg, a yellow beam). In another embodiment of the illumination system, the dichroic element 120 can also reflect the excitation beam L1 and pass the converted beam L2, but the optical architecture of the illumination system needs to be properly adjusted.

The wavelength conversion component 130 is configured with a wavelength conversion material (not labeled), and the wavelength conversion material may be a photoluminescence material for receiving a short wavelength light beam and generating a corresponding converted light beam L2 by photoluminescence phenomenon (see FIG. 1). Shown). The photoluminescent material is, for example, a phosphor powder, and the wavelength converting element 130 is, for example, a phosphor powder wheel, the phosphor powder wheel has a phosphor particle block (not shown), and the excitation light beam L1 is irradiated to the phosphor powder area. The converted beam L2 is excited by the block.

The above-mentioned light-collecting element 140 is, for example, a light integration rod, but is not limited thereto. The light integration column can be a solid cylinder or a hollow cylinder.

The lens array 150 of the present embodiment is disposed, for example, between the excitation light source module 110 and the dichroic element 120, and is located on the transmission path of the excitation light beam L1. Each lens unit 151 of the lens array 150 described above has, for example, a positive refractive power. For example, each lens unit 151 may be a plano-convex lens or a lenticular lens. In another embodiment, each lens unit 151 may also have a negative refracting power as desired. For example, each lens unit 151 may be a biconcave lens. Further, the excitation light beams L1 from these excitation light sources 111 form a plurality of light spots S3 on the lens array 150, and each of the light spots S3 covers, for example, at least two lens units 151. Since the energy concentration of the spot S3 of the excitation beam L1 is high, when covering at least two lens units 151, the covered lens units 151 cut the spot S3 and project it to the wavelength conversion element 130 to avoid excessive concentration of energy. An overall spot of uniformity is formed on the wavelength conversion element 130.

In order to enable most of the converted light beam L2 to enter the light homogenizing element 140 from the light incident end 141, the element structure of the illumination system 100 can be adjusted, and the lens unit 151 of the lens array 150 changes the shape of the excitation light beam L1, and then allows the wavelength to pass through. The shape of the converted light beam L2 converted by the conversion element 130 matches the shape of the light incident end 141 of the light homogenizing element 140. For example, the light incident ends 141 of the lens units 151 and the light homogenizing elements 140 are correspondingly rectangular, and the aspect ratio of each lens unit 151 is made larger than the aspect ratio of the light incident end 141 of the light homogenizing element 140. The correlation between the aspect ratio of each lens unit 151 and the aspect ratio of the light incident end 141 of the light homogenizing element 140 will be exemplified below.

4 is a schematic view of a spot of an excitation beam and a converted beam on a wavelength conversion element according to an embodiment of the invention. Referring to FIG. 2 and FIG. 4 simultaneously, it is assumed that the light incident end 141 of the light homogenizing element 140 is rectangular and the size of the light incident end 141 is 2.5 mm × 4.6 mm, and the spot magnification of the wavelength conversion element 130 to the light homogenizing element 140 is 2 times, it is necessary to preset the size of the spot S2 of the converted light beam L2 to the wavelength conversion element 130 to be 1.25 mm × 2.3 mm (the aspect ratio is 2.3/1.25 = 1.84). In addition, since the excitation light beam L1 is projected on the surface (not labeled) of the wavelength conversion material of the wavelength conversion element 130, the excitation light beam L1 forms an integral spot S1 on the surface, and the excitation light beam L1 enters the converted light beam converted in the wavelength conversion material. L2 will spread out around, so that the spot S2 when the converted beam L2 is emitted from the surface of the wavelength converting material of the wavelength converting element 130 is larger than the spot S1 where the exciting beam L1 converges on the wavelength converting element 130. That is, the length of the excitation spot L1 of the entire spot S1 of the wavelength conversion element 130 is smaller than the length of the spot S2 of the conversion beam L2 of the wavelength conversion element 130. Assuming that the length and width of the spot S2 of the converted light beam L2 at the wavelength conversion element 130 are both 0.25 mm, it is necessary to preset the size of the entire spot S1 of the excitation beam L1 to the wavelength conversion element 130 to be 1 mm × 2.05 mm (length and width). The ratio of 2.05) is such that the size of the spot S2 of the converted light beam L2 to the wavelength conversion element 130 is 1.25 mm × 2.3 mm. Therefore, the aspect ratio of the entire spot S1 where the excitation beam L1 converges on the wavelength conversion element 130 needs to be larger than the aspect ratio of the spot S2 of the conversion beam L2 to the wavelength conversion element 130.

In the above embodiment, the entire excitation beam L1 is concentrated by the lens array 150 on the surface of the wavelength conversion material of the wavelength conversion element 130 and forms an integral spot S1, and the long side 151a of each lens unit 151 is along the converted beam. When the transmission path of L2 is projected to the light incident end 141, parallel to the long side 141b of the light incident end 141, the long side L2c of the spot S2 of the converted light beam is parallel to the long side 141b of the light incident end 141 at the light incident end 141. Since the aspect ratio of each lens unit 151 is substantially equal to the aspect ratio of the excitation spot L1 to the overall spot S1 of the wavelength conversion element 130, the aspect ratio of each lens unit 151 is designed to be larger than that of the uniform light element 140. The aspect ratio of the end 141 is such that most of the converted beam L2 enters the light homogenizing element 140 from the light incident end 141 to reduce light loss. The values mentioned in the above derivation process are for illustrative purposes only, and those having ordinary skill in the art to which the present invention pertains may use a suitable aspect ratio of each lens unit 151 depending on the design values of the components in the illumination system 100.

The illumination system 100 described above may also include a plurality of lenses or other optical components, such as a first concentrating lens 160, a second concentrating lens 170, and a third concentrating lens 180. The first collecting lens 160 is disposed between the excitation light source module 110 and the dichroic element 120. The second condensing lens 170 is disposed between the lens array 150 and the wavelength conversion element 130. The third collecting lens 180 is disposed between the dichroic element 120 and the light homogenizing element 140. In the embodiment of FIG. 1 , the first concentrating lens 160 is located between the excitation light source module 110 and the lens array 150 , and the second concentrating lens 170 is located between the dichroic element 120 and the wavelength conversion component 130 , and the excitation beam L1 is The first concentrating lens 160, the lens array 150, the dichroic element 120, and the second condensing lens 170 are sequentially passed through the wavelength conversion element 130.

The illumination system 100 of the present embodiment changes the shape of the overall spot S1 formed by the excitation beam L1 to the wavelength conversion element 130 by the lens unit 151 of the lens array 150, thereby further changing the shape of the spot S2 of the converted beam L2 to the wavelength conversion element 130. The shape of the light incident end 141 of the light homogenizing element 140 is matched, so that the light loss when the converted light beam L2 enters the light homogenizing element 140 via the light incident end 141 can be reduced, and the light utilization efficiency can be improved.

Further, the wavelength conversion element 130 described above may also pass a portion of the excitation light beam L1, and the excitation light beam passing through the wavelength conversion element 130 may be represented by the excitation light beam L3. In detail, the wavelength conversion element 130 is, for example, a phosphor powder wheel, and has a phosphor particle block (not shown) and a light penetrating block (not shown). When the wavelength conversion element 130 rotates, the excitation light beam L1 is alternately irradiated in the phosphor powder block and the light penetrating block, and the excitation light beam L1 irradiated in the phosphor powder block is converted into the above-mentioned converted light beam L2, and is irradiated in the light. The excitation light beam L1 that penetrates the block and penetrates the wavelength conversion element 130 is the excitation light beam L3. In an embodiment, the excitation beam L1 is, for example, a blue beam, and the converted beam L2 is, for example, a yellow beam. In addition, the phosphor powder block can also have a plurality of phosphor powders that can produce different colors, so that the converted light beam L2 is divided into a plurality of colors according to timing. In addition, illumination system 100 can further include a light directing component 190 through which excitation beam L3 that passes through wavelength conversion component 130 is directed and transmitted to light homogenizing element 140. The light guiding component 190 includes, for example, three reflective elements 191, 192, 193 to sequentially reflect the excitation light beam L3 back to the color separation element 120, and the excitation light beam L3 passes through the color separation element 120 and is further transmitted to the light homogenizing element 140.

Although the embodiment is based on the fact that the phosphor powder wheel has a light-transmitting block, the architecture of the lighting system of the present invention is not limited thereto. In another embodiment, the phosphor powder wheel may have a phosphor particle block (not shown) and a reflective block (not shown), and the reflective block may be used to reflect the excitation beam and cooperate with other components of the illumination system. The excitation beam reflected by the reflective block and the converted beam enter the light homogenizing element.

Figure 5 is a schematic illustration of an illumination system in accordance with another embodiment of the present invention. Referring to FIG. 5, the illumination system 100a of the present embodiment is similar in structure and advantages to the illumination system 100 described above, and only the main differences in the structure will be described below. The lens array 150 of the illumination system 100a of the present embodiment is disposed between the color separation element 120 and the wavelength conversion element 130. The light incident ends 141 of the lens units 151 and the light homogenizing elements 140 are, for example, corresponding rectangles. Since both the excitation beam L1 and the conversion beam L2 pass through the lens array 150, the aspect ratio of each lens unit 151 can be designed to be substantially equal to the aspect ratio of the light incident end 141 of the light homogenizing element 140, so that the converted light beam L2 can be made. The spot shape of the light incident end 141 of the light homogenizing element 140 matches the shape of the light incident end 141, thereby reducing the light loss when the converted light beam L2 enters the light homogenizing element 140 from the light incident end 141 to improve the light utilization efficiency.

Figure 6 is a block diagram of a projection apparatus in accordance with an embodiment of the present invention. Referring to FIG. 6, the projection apparatus 10 of the present embodiment includes the illumination system 100, the light valve 20, and the projection lens 30 described above. The illumination system 100 is adapted to provide an illumination beam L. The light valve 20 is disposed on the transmission path of the illumination light beam L to convert the illumination light beam L into the image light beam La. The projection lens 30 is disposed on the transmission path of the image light beam La to project the image light beam La onto the screen to form an image on the screen. This illumination light beam L includes the above-described converted light beam L2 and excitation light beam L3. The illumination system 100 can also include a color wheel (not shown) to divide the illumination beam L into three more purely colored beams of red, green, and blue. The light valve 20 may be a transmissive light valve or a reflective light valve, wherein the transmissive light valve may be a liquid crystal display panel, and the reflective light valve may be a digital micro-mirror devic (DMD) or a germanium. Liquid crystal on silicon panel (LCoS panel). The number of light valves 20 may be one or more depending on the design. Furthermore, the illumination beam L can be positively incident on the light valve 20 or obliquely incident on the light valve 20.

Figure 7 is a schematic illustration of a light homogenizing element and a light valve in accordance with an embodiment of the present invention. Referring to FIG. 6 and FIG. 7 , the light-harvesting element 140 in the present embodiment has a light-emitting end 142 opposite to the light-incident end 141 , and the illumination light beam L emitted from the light-emitting end 142 is, for example, obliquely incident on the light-modulating area 21 of the light valve 20 . . The light modulation area 21 is an effective area in which the light valve 20 can convert the illumination light beam L into the image light beam La. Taking the light valve 20 as a digital micromirror device as an example, the light modulation region 21 is a region in which a plurality of micromirrors are arranged.

In this embodiment, the light-emitting end 142 of the light-harvesting element 140 and the light-modulating area 21 are, for example, rectangular, and the aspect ratio of the light-emitting end 142 of the light-smoothing element 140 can be adjusted to be larger than the aspect ratio of the light-modulating area 21, so that Most of the illumination beam L can be illuminated on the light modulation area 21 of the light valve 20 to enhance light utilization. Therefore, the aspect ratio of the light incident end 141 of the light homogenizing element 140 may be different from the aspect ratio of the light exit end 142.

In summary, the embodiment of the present invention can adjust the shape of the spot when the excitation beam emitted from the lens array is irradiated to the wavelength conversion element by using a single lens array, so that the spot shape of the converted beam converted by the wavelength conversion element is evenly matched. The shape of the light-input end of the optical element further increases the light utilization efficiency. The projection apparatus according to the embodiment of the present invention can improve light utilization efficiency by using the above illumination system.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention. In addition, the terms "first" and "second" as used in the specification or the scope of the patent application are used only to name the elements or to distinguish different embodiments or ranges, and are not intended to limit the number of elements. Upper or lower limit.

10‧‧‧Projector

20‧‧‧Light valve

21‧‧‧Light Modulation Area

30‧‧‧Projection lens

100, 100a‧‧‧ lighting system

110‧‧‧Excitation light source module

111‧‧‧Excitation source

112‧‧‧ Collimating lens

120‧‧‧Separation components

130‧‧‧wavelength conversion components

140‧‧‧Dod light components

141‧‧‧ into the optical end

142‧‧‧ light end

150‧‧‧ lens array

151‧‧‧ lens unit

160‧‧‧First condenser lens

170‧‧‧Second condenser lens

180‧‧‧ third condenser lens

190‧‧‧Light guiding components

191, 192, 193‧‧ ‧ reflective elements

151a‧‧‧ long side of the lens unit

141b‧‧‧The long side of the light end

L‧‧‧ illumination beam

L1‧‧‧Excitation beam

L2‧‧‧Converting beam

L2c‧‧‧ converts the long side of the beam

L3‧‧‧ part of the excitation beam

La‧‧·Image Beam

S1‧‧‧Integrated spot of the excitation beam on the wavelength conversion element

S2‧‧‧Spots that convert the beam to the wavelength conversion element

S3‧‧‧Spots of the excitation beam on the lens array

1 is a schematic view of an illumination system in accordance with an embodiment of the present invention. 2 is a schematic view of the light incident end of the light homogenizing element of FIG. 1. 3 is a schematic view of a spot formed by an excitation beam on a lens array in accordance with an embodiment of the present invention. 4 is a schematic view of a spot of an excitation beam and a converted beam on a wavelength conversion element according to an embodiment of the invention. Figure 5 is a schematic illustration of an illumination system in accordance with another embodiment of the present invention. Figure 6 is a block diagram of a projection apparatus in accordance with an embodiment of the present invention. Figure 7 is a schematic illustration of a light homogenizing element and a light valve in accordance with an embodiment of the present invention.

Claims (15)

An illumination system includes: an excitation light source module, a color separation component, a wavelength conversion component, a light homogenizing component, and a lens array; wherein the excitation light source module includes a plurality of excitation light sources, and each of the excitation light sources is suitable for Providing an excitation beam; the dichroic element is disposed on the transmission path of the excitation light beams, and is adapted to transmit the excitation light beams from the excitation light source module to the wavelength conversion component; the wavelength conversion component is disposed from the a path of the excitation beams of the dichroic elements to convert the excitation beams into a converted beam and to reflect the converted beam to the dichroic element, the dichroic element being adapted to transmit the converted beam to the homogenizing The light absorbing element is disposed on a transmission path of the converted light beam from the color separation element, the light absorbing element has an light incident end; and the lens array is disposed on a transmission path of the excitation light beams, the lens array a plurality of lens units, wherein a long side of each of the lens units is projected to the light incident end along a transmission path of the converted light beam, and the light incident end Sides are parallel. The illumination system of claim 1, wherein the lens array is disposed between the excitation light source module and the color separation element. The illumination system of claim 2, wherein each of the lens units and the light incident end of the light homogenizing element has a corresponding rectangular shape, and an aspect ratio of each of the lens units is greater than a length of the light incident end of the light homogenizing element. Width ratio. The illumination system of claim 3, wherein the excitation beams are concentrated by the lens array on the wavelength conversion element and form an overall spot, and the length to width ratio of each of the lens units is equal to the excitation beams converted at the wavelength The aspect ratio of the overall spot of the component. The illumination system of claim 3, wherein an aspect ratio of an integral spot of the excitation beam concentrated on the wavelength conversion element is greater than an aspect ratio of a spot of the conversion beam to the wavelength conversion element, the excitation beams The length of the integral spot of the wavelength converting element is less than the length of the spot of the converted beam to the wavelength converting element. The illumination system of claim 2, further comprising: a first concentrating lens disposed between the excitation light source module and the lens array; a second concentrating lens disposed at the color separation element and the wavelength Between the conversion elements; and a third concentrating lens disposed between the color separation element and the light concentrating element. The illumination system of claim 1, wherein the lens array is disposed between the color separation element and the wavelength conversion element. The illumination system of claim 7, wherein each of the lens units and the light incident end of the light homogenizing element has a corresponding rectangular shape, and an aspect ratio of each of the lens units is equal to a length of the light incident end of the light homogenizing element. Width ratio. The illumination system of claim 8, wherein the excitation light beams are concentrated by the lens array on the wavelength conversion element and form an overall spot, and the length to width ratio of each of the lens units is equal to the excitation light beams converted at the wavelength The aspect ratio of the overall spot of the component. The illumination system of claim 7, further comprising: a first concentrating lens disposed between the excitation light source module and the color separation element; a second concentrating lens disposed at the lens array and the wavelength Between the conversion elements; and a third concentrating lens disposed between the color separation element and the light concentrating element. The illumination system of claim 1, wherein a spot of each excitation beam on the lens array covers at least two of the lens units. The illumination system of claim 1, wherein the excitation light source module comprises a plurality of collimating lenses respectively disposed in front of the excitation light sources, and adapted to transmit the excitation light beams to the color separation elements. The illumination system of claim 1, wherein the wavelength conversion element is adapted to pass a portion of the excitation beams, and the illumination system further comprises a light guiding component, the excitation beams passing through the wavelength conversion element This portion is guided by the light guiding assembly and transmitted to the light homogenizing element. A projection device, comprising: the illumination system according to any one of claims 1 to 11, adapted to provide an illumination beam; a light valve disposed on the transmission path of the illumination beam to convert the illumination beam into a An image beam; and a projection lens disposed on the transmission path of the image beam. The projection device of claim 14, wherein the light-harvesting element has a light-emitting end opposite to the light-incident end, and the illumination light beam emitted from the light-emitting end obliquely enters a light-modulating area of the light valve, the light-emitting area The end and the light modulation area are rectangular, and an aspect ratio of the light exiting end of the light homogenizing element is greater than an aspect ratio of the light modulation area.