TW201935085A - Illumination system and projection apparatus - Google Patents

Abstract

An illumination system 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, wherein each excitation light source is adapted to provide an excitation light beam. The dichroic element is adapted to transmit the excitation light beams to the wavelength conversion element. The wavelength conversion element is adapted to convert the excitation light beams to a conversion light beam, and reflect the conversion light beam to the dichroic element. The dichroic element is adapted to transmit the conversion light beam to the light homogenizing element. The light homogenizing element is disposed on a transmission path of the conversion light beam from the dichroic element, and has a light incident end. The lens array is disposed on a transmission path of the excitation light beam, and includes a plurality of lens units. When projected to the light incident end along the transmission path of the conversion light beam, a long side of each lens unit is parallel to a long side of the light incident end.

Description

Lighting system and projection device

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

The types of light sources used in projection devices have evolved from ultra-high pressure mercury lamps (UHP lamps) and light emitting diodes (LEDs) in accordance with market requirements for brightness, color saturation, service life, non-toxic and environmental protection of projection devices. To a 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 wheel to generate a fluorescent beam, and then homogenizes by a homogenizing element. Fluorescent beam. However, the light entrance end of the homogenizing element is rectangular, and the spot formed by the excitation light beam on the phosphor wheel is a circular spot. The excited fluorescent light beam will form a circle at the light entrance end of the light homogenizing element. Light spot. Because the shape of the spot formed by the fluorescent light beam at the light entrance end does not match the shape of the light entrance end, the light utilization rate is deteriorated, and the brightness of the projection device is reduced.

This "prior art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "prior art" may include some conventional technologies that do not constitute the ordinary knowledge of those skilled in the art. In addition, the content disclosed in the "prior art" does not represent the content or the problem to be solved by one or more embodiments of the present invention, nor does it mean that prior to the application of the present invention, it has been used by those with ordinary knowledge in the technical field to which it belongs. Know or know.

The invention provides a lighting system, which can improve the light utilization rate.

The invention provides a projection device, which can improve the light utilization rate.

Other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention.

In order to achieve one or a part or all of the foregoing or other objectives, an illumination system provided by an embodiment of the present invention includes an excitation light source module, a dichroic element, a wavelength conversion element, a uniform light element, and a lens array. . The excitation light source module includes a plurality of excitation light sources, and each excitation light source is adapted to provide an excitation light beam. The dichroic element is disposed on the transmission path of the excitation beam, and is suitable for transmitting the excitation beam from the excitation light source module to the wavelength conversion element. The wavelength conversion element is disposed on the transmission path of the excitation beam from the dichroic element to convert the excitation beam into a converted beam and reflect the converted beam to the dichroic element. The dichroic element is adapted to transmit the converted beam to the uniform light element. The light homogenizing element is disposed on the transmission path of the converted light beam from the dichroic element. The light homogenizing element has a light incident end. The lens array is disposed on the transmission path of the excitation light beam. The lens array includes a plurality of lens units. When the long side of each lens unit is projected along the transmission path of the converted light beam to the light entrance end, it is parallel to the long side of the light entrance end.

In order to achieve one or a part or all of the foregoing or other objectives, a projection device provided by an embodiment of the present invention includes the above-mentioned lighting system, light valve, and projection lens. The lighting system described above is suitable for providing an illumination beam. The light valve is disposed on a transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam.

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

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

In an embodiment of the present invention, the above-mentioned excitation beam is converged on the wavelength conversion element through the lens array to form an overall spot, and the aspect ratio of each lens unit is equal to the overall aspect ratio of the excitation beam on the wavelength conversion element.

In an embodiment of the present invention, the aspect ratio of the entire spot of the excitation beam focused on the wavelength conversion element is greater than the aspect ratio of the spot of the converted beam on the wavelength conversion element, and the length of the entire spot of the excitation beam on the wavelength conversion element. Less than the length of the spot where the light beam is converted to the wavelength conversion element.

In an embodiment of the present invention, the lighting system further includes a first condenser lens, a second condenser lens, and a third condenser lens. The first condenser lens is disposed between the excitation light source module and the lens array. The second condenser lens is disposed between the dichroic element and the wavelength conversion element. The third condensing lens is disposed between the dichroic element and the uniform light element.

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

In an embodiment of the present invention, the light incident ends of the lens units and the light homogenizing element 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 present invention, the above-mentioned excitation beam is converged on the wavelength conversion element through the lens array to form an overall spot, and the aspect ratio of each lens unit is equal to the overall aspect ratio of the excitation beam on the wavelength conversion element.

In an embodiment of the present invention, the lighting system further includes a first condenser lens, a second condenser lens, and a third condenser lens. The first condenser lens is disposed between the excitation light source module and the dichroic element. The second condenser lens is disposed between the lens array and the wavelength conversion element. The third condensing lens is disposed between the dichroic element and the uniform light element.

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

In an embodiment of the present invention, the above-mentioned excitation light source module includes a plurality of collimating lenses, which are respectively disposed in front of the excitation light source to transmit the excitation light beam to the color separation element.

In an embodiment of the present invention, the above-mentioned wavelength conversion element is adapted to pass a part of the excitation light beam, and the illumination system further includes a light guiding component, and the part of the excitation light beam passing through the wavelength conversion element is guided by the light guiding component. And passed to the uniform light element.

In an embodiment of the present invention, the light homogenizing element has a light exit end opposite to the light entrance end, and the illumination light beam emitted from the light exit end obliquely enters the light modulation area of the light valve. The light exit end and the light modulation area are rectangular, and The aspect ratio of the light-emitting end of the light homogenizing element is greater than the aspect ratio of the light modulation region.

Because the lens array is used in the present invention, the spot shape of the excitation beam emitted from the lens array when the wavelength conversion element is irradiated can be adjusted so that the spot shape of the converted light beam converted by the wavelength conversion element corresponds to the shape of the light entrance end of the uniformity element. Improve light utilization. Since the projection device of the embodiment of the present invention uses the above-mentioned lighting system, the light utilization rate can be improved.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with reference to the accompanying drawings, as follows.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or rear, are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

FIG. 1 is a schematic diagram of a lighting system according to an embodiment of the present invention. Please refer to FIGS. 1 and 2. The illumination system 100 of this embodiment includes an excitation light source module 110, a dichroic element 120, a wavelength conversion element 130, a uniform light element 140, and a lens array 150. The excitation light source module 110 includes a plurality of excitation light sources 111, and each excitation light source 111 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 suitable for transmitting 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 beams L1 from the dichroic element 120 to convert the excitation beams L1 into conversion beams L2 and reflect the conversion beams L2 to the dichroic element 120, wherein the wavelength of the excitation beams L1 is Different from the wavelength of the converted light beam L2, the dichroic element 120 is adapted to pass the converted light beam L2 to the uniform light element 140. The light homogenizing element 140 is disposed on a transmission path of the converted light beam L2 from the dichroic element 120. The light homogenizing element 140 has a light incident end 141. In this embodiment, the lens array 150 may use only a single group and be disposed on the transmission path of the excitation light beam L1. The lens array 150 includes a plurality of lens units 151.

FIG. 2 is a schematic diagram of a light incident end of the homogeneous element of FIG. 1, and FIG. 3 is a schematic diagram of a light spot formed by an excitation beam on a lens array according to an embodiment of the present invention. Please refer to FIGS. 1, 2 and 3. In this embodiment, when 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, the long side 141 b parallel. Because the lens array 150 shapes 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 exiting the lens array 150 will be Corresponding to the shape of the lens unit 151, the long side of the light spot of the converted light beam L2 is parallel to the long side 141b of the light entrance end 141.

Please refer to FIG. 1 and FIG. 3. In this embodiment, the excitation light source 111 is, for example, a laser light source or other solid-state light sources, but is not limited thereto. These excitation light sources 111 are arranged in an array, for example. The number of the excitation light sources 111 in this embodiment is 20 as an example, so 20 light 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, which are respectively disposed in front of the excitation light sources 111, that is, the collimating lens 112 is located between the excitation light source 111 and the lens array 150. The lens 112 is adapted to transmit the excitation light beam L1 to the dichroic element 120. In another embodiment, the plurality of collimating lenses 112 may be replaced by a lens array.

The above-mentioned 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 (for example, a blue beam) and reflect the converted beam L2 (for example, a yellow beam). In another embodiment of the lighting system, the dichroic element 120 may also reflect the excitation light beam L1 and let the converted light beam L2 pass, but the optical structure of the lighting system needs to be adjusted appropriately.

The above-mentioned wavelength conversion element 130 is provided with a wavelength conversion material (not labeled). The wavelength conversion material may be a photoluminescence material for receiving a short-wavelength light beam and generating a corresponding conversion light beam L2 through a photoluminescence phenomenon (as shown in FIG. 1). As shown). The photoluminescent material is, for example, a phosphor, and the wavelength conversion element 130 is, for example, a phosphor wheel. The phosphor wheel has a phosphor block (not shown), and the excitation beam L1 is irradiated on the phosphor region. The block will excite the converted beam L2.

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

The lens array 150 in this embodiment is, for example, disposed 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 has, for example, 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 have a negative refractive power according to requirements. For example, each lens unit 151 may be a biconcave lens. In addition, the excitation light beam L1 from these excitation light sources 111 forms a plurality of light spots S3 on the lens array 150, and each light spot S3 covers at least two lens units 151, for example. Because the energy concentration of the spot S3 of the excitation beam L1 is high, when at least two lens units 151 are covered, each covered lens unit 151 cuts the spot S3 and projects it to the wavelength conversion element 130 to avoid excessive concentration of energy, thereby An overall light spot with better uniformity is formed on the wavelength conversion element 130.

In order to allow most of the converted beam L2 to enter the light homogenizing element 140 from the light entrance end 141, the element structure of the illumination system 100 can be adjusted. The shape of the excitation beam L1 is changed by each lens unit 151 of the lens array 150, and the wavelength of 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 lens unit 151 and the light incident end 141 of the light uniformity element 140 are made into corresponding rectangles, and the aspect ratio of each lens unit 151 is greater than the aspect ratio of the light incident end 141 of the light uniformity element 140. The relationship between the aspect ratio of each lens unit 151 and the aspect ratio of the light entrance end 141 of the light homogeneous element 140 will be described below by way of example.

FIG. 4 is a schematic diagram of a spot of an excitation beam and a converted beam on a wavelength conversion element according to an embodiment of the present invention. Please refer to FIG. 2 and FIG. 4 at the same time. Assume that the light entrance end 141 of the light uniformity element 140 is rectangular and the size of the light entrance end 141 is 2.5 mm × 4.6 mm. The spot magnification of the wavelength conversion element 130 to the light uniformity element 140 is 2 times, the size of the spot S2 of the converted light beam L2 on the wavelength conversion element 130 needs to be preset to be 1.25 mm × 2.3 mm (the aspect ratio is 2.3 / 1.25 = 1.84). In addition, when 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 into the wavelength conversion material. L2 will spread around, so that the spot S2 when the converted light beam L2 emerges from the surface of the wavelength conversion material of the wavelength conversion element 130 will be larger than the entire spot S1 where the excitation light beam L1 converges on the wavelength conversion element 130. That is, the length of the entire light spot S1 of the excitation light beam L1 on the wavelength conversion element 130 is smaller than the length of the light spot S2 of the conversion light beam L2 on the wavelength conversion element 130. It is assumed that the increase in length and width of the converted light beam L2 on the spot S2 of the wavelength conversion element 130 is 0.25 mm. Therefore, it is necessary to preset the size of the entire light spot S1 of the excitation beam L1 on the wavelength conversion element 130 to be 1 mm × 2.05 mm (length and width). The ratio is 2.05), so that the size of the spot S2 of the converted light beam L2 on the wavelength conversion element 130 can be 1.25 mm × 2.3 mm. Therefore, the aspect ratio of the entire spot S1 of the excitation beam L1 converged on the wavelength conversion element 130 needs to be larger than the aspect ratio of the spot S2 of the converted beam L2 on the wavelength conversion element 130.

Continuing the above, in this embodiment, the entire excitation beam L1 is collected by the lens array 150 on the surface of the wavelength conversion material of the wavelength conversion element 130 to form an overall light spot S1, and the long side 151a of each lens unit 151 is along the converted light beam. When the transmission path of L2 is projected to the light incident end 141, it is parallel to the long side 141b of the light incident end 141, so that the long side L2c of the spot S2 of the converted beam is parallel to the light incident end 141 of the light incident end 141. Since the aspect ratio of each lens unit 151 is substantially equal to the aspect ratio of the entire light spot S1 of the excitation beam L1 to the wavelength conversion element 130, the aspect ratio of each lens unit 151 needs to be designed to be greater than the light incident of the uniform light element 140. The aspect ratio of the end 141 is such that most of the converted light beam L2 enters the light uniformity element 140 from the light entrance end 141 and reduces light loss. The numerical values mentioned in the above derivation process are for example only. Those with ordinary knowledge in the technical field to which the present invention pertains may use the appropriate aspect ratio of each lens unit 151 according to different design values of each element in the lighting system 100.

The above-mentioned lighting system 100 may further include a plurality of lenses or other optical elements, such as a first condenser lens 160, a second condenser lens 170, and a third condenser lens 180. The first condenser lens 160 is disposed between the excitation light source module 110 and the dichroic element 120. The second condenser lens 170 is disposed between the lens array 150 and the wavelength conversion element 130. The third condenser lens 180 is disposed between the dichroic element 120 and the uniform light element 140. In the embodiment of FIG. 1, if the first condenser lens 160 is located between the excitation light source module 110 and the lens array 150, and the second condenser lens 170 is located between the dichroic element 120 and the wavelength conversion element 130, the excitation light beam L1 After passing through the first condensing lens 160, the lens array 150, the dichroic element 120, and the second condensing lens 170 in this order, they are collected on the wavelength conversion element 130.

In the lighting system 100 of this embodiment, the shape of the entire light spot S1 formed by the excitation light beam L1 on the wavelength conversion element 130 is changed by each lens unit 151 of the lens array 150, so that the shape of the converted light beam L2 on the light spot S2 of the wavelength conversion element 130 and The shape of the light entrance end 141 of the light homogenizing element 140 matches, so the light loss when the converted light beam L2 enters the light homogenizing element 140 through the light entrance end 141 can be reduced, and the light utilization rate can be improved.

In addition, the above-mentioned wavelength conversion element 130 may pass a part of the excitation light beam L1, and the excitation light beam L3 is hereinafter referred to as the excitation light beam that passes through the wavelength conversion element 130. In detail, the wavelength conversion element 130 is, for example, a phosphor wheel, and has a phosphor block (not shown) and a light transmission block (not shown). When the wavelength conversion element 130 rotates, the excitation beam L1 will alternately irradiate the phosphor block and the light transmission block, and the excitation beam L1 irradiated on the phosphor block will be converted into the conversion beam L2 described above and irradiated on the light. The excitation beam L1 that penetrates the block and penetrates the wavelength conversion element 130 is the excitation beam L3. In one embodiment, the excitation light beam L1 is, for example, a blue light beam, and the conversion light beam L2 is, for example, a yellow light beam. In addition, the phosphor block can also have a variety of phosphors that can generate different colors, so that the converted light beam L2 is divided into multiple colors in accordance with the time sequence. In addition, the lighting system 100 may further include a light guide component 190, and the excitation light beam L3 passing through the wavelength conversion element 130 is guided by the light guide component 190 and transmitted to the light uniformity element 140. The light guide assembly 190 includes, for example, three reflective elements 191, 192, and 193 to sequentially reflect the excitation light beam L3 back to the dichroic element 120. The excitation light beam L3 passes through the dichroic element 120 and is then transmitted to the light uniformity element 140.

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

FIG. 5 is a schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to FIG. 5. The structure and advantages of the lighting system 100 a of this embodiment are similar to those of the lighting system 100 described above, and only the main differences in the structure will be described below. The lens array 150 of the illumination system 100 a of this embodiment is disposed between the dichroic element 120 and the wavelength conversion element 130. The light-incident end 141 of each lens unit 151 and the light uniformity element 140 is, for example, a corresponding rectangle. 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 approximately equal to the aspect ratio of the light entrance end 141 of the uniformity element 140, so that the conversion beam L2 can be made. The shape of the light spot at the light entrance end 141 of the light uniformity element 140 matches the shape of the light entrance end 141, thereby reducing the light loss when the converted light beam L2 enters the light uniformity element 140 from the light entrance end 141, so as to improve the light utilization efficiency.

FIG. 6 is a block diagram of a projection apparatus according to an embodiment of the present invention. Please refer to FIG. 6, the projection device 10 of this embodiment includes the above-mentioned illumination system 100, light valve 20 and projection lens 30. The lighting system 100 is adapted to provide an illumination light beam L. The light valve 20 is disposed on a transmission path of the illumination light beam L to convert the illumination light beam L into an image light beam La. The projection lens 30 is disposed on a transmission path of the image light beam La to project the image light beam La to a screen, and further forms an image frame on the screen. The illumination light beam L includes the conversion light beam L2 and the excitation light beam L3 described above. The lighting system 100 may further include a color wheel (not shown) to divide the illumination light beam L into three light beams of red, green, and blue with more pure colors. 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 silicon Liquid crystal panel (liquid crystal on silicon panel, LCoS panel). According to different design architectures, the number of the light valves 20 may be one or more. In addition, the illumination light beam L may be incident on the light valve 20 in a forward direction or incident on the light valve 20 in an oblique direction.

FIG. 7 is a schematic diagram of a light homogenizing element and a light valve according to an embodiment of the present invention. Please refer to FIG. 6 and FIG. 7. The light homogenizing element 140 in this embodiment has a light exit end 142 opposite to the light entrance end 141. The illumination light beam L emitted from the light exit end 142 is, for example, the light modulation region 21 of the oblique incidence light valve 20. . The light modulation area 21 is an effective area where the light valve 20 can convert the illumination light beam L into an image light beam La. Taking the light valve 20 as a digital micromirror element as an example, the light modulation region 21 is an area where a plurality of micromirrors are arranged.

In this embodiment, the light exiting end 142 and the light modulation region 21 of the light uniforming element 140 are, for example, rectangular, and the aspect ratio of the light exiting end 142 of the light uniforming element 140 can be adjusted to be greater than the aspect ratio of the light modulation region 21 so that Most of the illumination light beam L can be irradiated on the light modulation region 21 of the light valve 20 to improve light utilization efficiency. Therefore, the aspect ratio of the light entrance end 141 of the light homogeneous element 140 may be different from that of the light exit end 142.

In summary, the embodiment of the present invention uses a single-group lens array to adjust the spot shape of the excitation beam emitted from the lens array when the wavelength conversion element is irradiated, so that the spot shape of the converted beam converted by the wavelength conversion element is uniform. The shape of the light-entry end of the optical element further improves light utilization. Since the projection device of the embodiment of the present invention uses the above-mentioned lighting system, the light utilization rate can be improved.

However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made according to the scope of the patent application and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of patent application does not need to achieve all the purposes or advantages or features disclosed by the invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not intended to limit the scope of rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element or to distinguish between different embodiments or ranges, not to limit the number of elements. Upper or lower limit.

10‧‧‧ Projection device

20‧‧‧light valve

21‧‧‧light modulation area

30‧‧‧ projection lens

100, 100a‧‧‧lighting system

110‧‧‧Excitation light source module

111‧‧‧excitation light source

112‧‧‧ collimating lens

120‧‧‧ color separation element

130‧‧‧wavelength conversion element

140‧‧‧Uniform light element

141‧‧‧Incoming light end

142‧‧‧light output

150‧‧‧ lens array

151‧‧‧lens unit

160‧‧‧The first condenser lens

170‧‧‧Second condenser lens

180‧‧‧ third condenser lens

190‧‧‧light guide assembly

191, 192, 193‧‧‧ Reflective elements

151a‧‧‧Long side of lens unit

141b‧‧‧Long side of light entrance

L‧‧‧illumination beam

L1‧‧‧ Excitation beam

L2‧‧‧Converted beam

L2c‧‧‧ The long side of the spot of the converted beam

L3‧‧‧ part of the excitation beam

La‧‧‧Image Beam

S1‧‧‧The whole spot of the excitation beam in the wavelength conversion element

S2‧‧‧ converts the light beam to the spot of the wavelength conversion element

S3‧‧‧ Spot of excitation beam on lens array

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

Claims (15)

An illumination system includes: an excitation light source module, a dichroic element, a wavelength conversion element, a uniform light element, and a lens array; wherein the excitation light source module includes a plurality of excitation light sources, each of which is suitable for Providing an excitation beam; the dichroic element is disposed on the transmission path of the excitation beams, and is adapted to transmit the excitation beams from the excitation light source module to the wavelength conversion element; the wavelength conversion element is disposed on the The transmission paths of the excitation beams of the color separation element are used to convert the excitation beams into a conversion beam and reflect the conversion beam to the color separation element. The color separation element is adapted to transmit the conversion beam to the uniform light. The light diffusing element is disposed on a transmission path of the converted light beam from the dichroic element, the light diffusing element has a light entrance end; and the lens array is disposed on the transmission path of the excitation light beams, the lens array The lens unit includes a plurality of lens units. When the long sides of the lens units are projected to the light input end along the transmission path of the converted light beam, Sides are parallel. The lighting system according to claim 1, wherein the lens array is disposed between the excitation light source module and the color separation element. The lighting system according to claim 2, wherein each of the lens units and the light entrance end of the light uniformity element is a corresponding rectangle, and an aspect ratio of each of the lens units is greater than a length of the light entrance end of the light uniformity element. Aspect ratio. The illumination system according to claim 3, wherein the excitation beams are focused on the wavelength conversion element through the lens array to form an integral light spot, and the aspect ratio of each of the lens units is equal to the conversion of the excitation beams at the wavelength The aspect ratio of the overall light spot of the element. The illumination system according to claim 3, wherein an aspect ratio of an entire spot of the excitation beams converged on the wavelength conversion element is greater than an aspect ratio of an spot of the converted beams on the wavelength conversion element, and the excitation beams The length of the entire light spot at the wavelength conversion element is shorter than the length of the light spot of the converted light beam at the wavelength conversion element. The lighting system according to claim 2, further comprising: a first condenser lens disposed between the excitation light source module and the lens array; a second condenser lens disposed between the dichroic element and the wavelength Between the conversion elements; and a third condenser lens disposed between the dichroic element and the uniform light element. The lighting system according to claim 1, wherein the lens array is disposed between the dichroic element and the wavelength conversion element. The lighting system according to claim 7, wherein each of the lens units and the light entrance end of the light uniformity element is a corresponding rectangle, and an aspect ratio of each of the lens units is equal to the length of the light entrance end of the light uniformity element. Aspect ratio. The illumination system according to claim 8, wherein the excitation beams are converged on the wavelength conversion element through the lens array to form an overall light spot, and the aspect ratio of each of the lens units is equal to the conversion of the excitation beams at the wavelength The aspect ratio of the overall light spot of the element. The lighting system according to claim 7, further comprising: a first condenser lens disposed between the excitation light source module and the dichroic element; a second condenser lens disposed between the lens array and the wavelength Between the conversion elements; and a third condenser lens disposed between the dichroic element and the uniform light element. The lighting system according to claim 1, wherein a spot of each excitation beam on the lens array covers at least two of the lens units. The illumination system according to claim 1, wherein the excitation light source module includes a plurality of collimating lenses, which are respectively disposed in front of the excitation light sources and are suitable for transmitting the excitation light beams to the color separation element. The lighting system according to claim 1, wherein the wavelength conversion element is adapted to pass a part of the excitation light beams, and the lighting system further includes a light guiding component, the excitation light beams passing through the wavelength conversion element The part is guided by the light guide assembly and transferred to the light homogenizing element. A projection device includes: an illumination system according to any one of claims 1 to 11 adapted to provide an illumination beam; a light valve configured on a transmission path of the illumination beam to convert the illumination beam into a light beam; An image beam; and a projection lens disposed on a transmission path of the image beam. The projection device according to claim 14, wherein the light homogenizing element has a light output end opposite to the light input end, and the illumination light beam emitted from the light output end enters a light modulation area of the light valve obliquely, and the light output The end and the light modulation area are rectangular, and the aspect ratio of the light output end of the light homogenizing element is greater than the aspect ratio of the light modulation area.