CN110955104B - Light source system and projection system - Google Patents

Light source system and projection system Download PDF

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Publication number
CN110955104B
CN110955104B CN201811126090.3A CN201811126090A CN110955104B CN 110955104 B CN110955104 B CN 110955104B CN 201811126090 A CN201811126090 A CN 201811126090A CN 110955104 B CN110955104 B CN 110955104B
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China
Prior art keywords
light source
light
lens
fly
array
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CN201811126090.3A
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CN110955104A (en
Inventor
胡飞
余新
张贤鹏
郭祖强
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to CN201811126090.3A priority Critical patent/CN110955104B/en
Priority to PCT/CN2019/100489 priority patent/WO2020063159A1/en
Publication of CN110955104A publication Critical patent/CN110955104A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/12—Projectors or projection-type viewers; Accessories therefor adapted for projection of either still pictures or motion pictures
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Abstract

A light source system, comprising: a light source, an optical assembly and a control unit; the light source includes a light source array formed of a plurality of light source units; the control unit is used for independently controlling each light source unit; the optical assembly comprises a fly-eye lens assembly and a lens array which are sequentially arranged on the light path of the light source; the fly-eye lens assembly comprises a fly-eye lens pair or a single fly-eye lens; the lens array comprises a plurality of lens units arranged in an array, and each lens unit corresponds to at least one light source unit.

Description

Light source system and projection system
Technical Field
The present invention relates to the field of optics, and in particular, to a light source system and a projection system including the same.
Background
The High Dynamic Range (HDR) projection system can increase the contrast and peak brightness output by the projector, so that the bright field and dark field parts in the picture can display rich gray scale information, thereby greatly improving the picture effect and audience viewing experience. In the prior art, a method for realizing HDR projection display is to increase the uniformity of an area illumination light field by using a method of generating a light spot array by using a square bar array. However, the square rod array is difficult to process and is not suitable for mass production, and when the projection system is assembled, the alignment accuracy between the square rod and the light source needs to be considered, and the square rod is easily damaged, which affects the quality of the projection system.
Disclosure of Invention
Accordingly, the present invention is directed to a light source system and a projection system including the same, which can overcome the above-mentioned problems, and can realize high dynamic display.
A light source system, comprising: a light source, an optical assembly and a control unit; the light source includes a light source array formed of a plurality of light source units; the control unit is used for independently controlling each light source unit;
the optical assembly comprises a light spot compression lens array, a fly-eye lens assembly and a lens array which are sequentially arranged on the light path of the light source; the fly-eye lens assembly comprises a pair of fly-eye lenses or a single fly-eye lens; the lens array comprises a plurality of lens units arranged in an array, and each lens unit corresponds to at least one light source unit; the light spot compression lens array receives light spots emitted from the light source and compresses the light spots to obtain a light spot array with a smaller area.
A projection system comprising a light source system, and a spatial light modulator located in an optical path of light emitted by the light source system and a lens system located in an optical path of the spatial light modulator, wherein: the control unit is electrically connected with the light source and the spatial light modulator, and the lens system is used for projecting the light field modulated by the spatial light modulator onto a projection screen.
Compared with the prior art, the light source system provided by the invention can independently control each light source unit through the control unit so as to realize local dimming of the light source, the light beam emitted by the light source unit directly passes through the fly eye lens assembly and the lens array positioned in the light emitting direction of the fly eye lens assembly to separate the light source to form the independent light source unit, and the independent light source unit is controlled, so that high dynamic range display is realized. Meanwhile, the optical device of the light source system is simple to process, so that the process is simplified.
Drawings
Fig. 1 is a schematic structural diagram of a light source system according to a first embodiment of the present invention.
FIG. 2 is a block diagram of a projection system according to a preferred embodiment of the present invention.
Fig. 3 is a schematic diagram of a second embodiment of the projection system shown in fig. 2.
Fig. 4 is a diagram showing a distribution of light fields formed when the light source unit is fully opened.
Fig. 5 is a schematic view of the light field distribution when one of the light source units is turned off.
Fig. 6 is a schematic diagram of the relationship between the size of the illumination light field, the rectangular spot size and the spot gap.
Fig. 7 is a flowchart of the operation of the projection system provided in fig. 2.
Fig. 8 is a schematic diagram of a third embodiment of the projection system shown in fig. 2.
Fig. 9 is a schematic diagram of a fourth embodiment of the projection system shown in fig. 2.
Fig. 10 is a schematic diagram of a fifth embodiment of the projection system shown in fig. 2.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a light source system 1 according to the present invention, wherein the light source system 1 is used as a light source of a projection system to generate a picture with a high dynamic range. The light source system 1 comprises a light source 2, an optical assembly 20 and a control unit 3.
The light source 2 includes a light source array formed of a plurality of light source units 10. Each light source unit 10 is independently controllable. In the present embodiment, each light source unit 10 may be controlled by the control unit 3 to be in an on state, an off state and/or control the current/voltage intensity of each light source unit 10 to emit light having different brightness.
Preferably, the plurality of light source units 10 form a light source array with an aspect ratio approximate to a projection screen. In the present embodiment, the light source units 10 are arranged in an array of M × N, and the aspect ratio of the array shape is similar to the aspect ratio of the projection screen.
Preferably, the aspect ratio of the light source 2 is the same as the aspect ratio of the projection screen. By setting the aspect ratio of the light source 2 in this manner, waste of light emitted from the light source can be minimized. In general, the aspect ratio of the projection screen may be 4:3 or 16:9.
preferably, the light source unit 10 is preferably a solid-state light source. The solid-state light source can comprise a semiconductor laser, a fiber laser or any combination of the two or a non-laser light source such as a Light Emitting Diode (LED). The lasers or LEDs may be solid state light sources of different or the same wavelength. In the present embodiment, the spatial luminance distribution of the light beam emitted from each light source unit 10 changes only the spatial gray-scale distribution of the image light without changing the color gamut spatial distribution of the image light, thereby ensuring that the intensity distribution in the three primary color space is constant, and thus ensuring the uniformity of the color of the projection screen.
The optical assembly 20 includes a fly-eye lens assembly 22 and a lens array 23 sequentially disposed on the light path of the light source 2.
The fly-eye lens assembly 22 comprises a pair of fly-eye lenses or a single fly-eye lens. The fly-eye lens assembly 22 is used for dodging and shaping, and the shaping can form a spot shape with a predetermined shape, such as a rectangle or a square. In the present embodiment, the fly-eye lens assembly 22 can shape the light spots projected thereon in an elliptical or circular gaussian distribution into square light spots with a fixed interval and emit the light spots from the emission surface.
Preferably, the fly-eye lens assembly 22 is a single fly-eye lens, a single-piece double fly-eye lens, or a double-piece single fly-eye lens. A monolithic bifocal fly's eye lens refers to a single lens having a plurality of microlenses 222 disposed on opposite surfaces of the single lens.
More preferably, the double-piece single fly-eye lens comprises two fly-eye lenses 220 arranged in mirror image. Each fly-eye lens 220 is formed by a plurality of micro lenses 222 in an array arrangement, the micro lenses 222 in two fly-eye lenses 220 are arranged in a direction away from each other, and two corresponding micro lenses 222 arranged in front and back on an optical path in the two fly-eye lenses 220 have the same shape and are in one-to-one correspondence.
More preferably, the pitch of the two fly-eye lenses 220 is equal to the focal length of the single microlens 222. This allows the previous microlens (fly eye) 222 to be imaged onto the subsequent microlens 222 (fly eye), i.e. the emitted light source is matched to the shape of the microlens 222.
More preferably, the shape of the microlenses 222 is preferably rectangular. The shape of the light spot passing through the compound eye lens assembly 22 is rectangular, the shape of the display area can be matched better, the space and the gap between the light spots are easy to control, and therefore light loss caused by mismatching of the shape of the light spot and the shape of projection can be reduced. Of course, if the display area is square or has other specific shape, the shape of the light spot emitted by the fly-eye lens assembly can be matched with the shape of the display area by changing the shape of the micro-lens.
That is, the pitch, size and shape of the spots in the spot array are determined by the focal length, size and shape of the single micro lens 222 of the fly-eye lens assembly 22 and the focal length of the lens in the corresponding lens array, so as to achieve the technical problem of uniformizing the light output of the light source.
The lens array 23 includes a plurality of lens units arranged in an array, and each lens unit corresponds to at least one light source unit 10. In the present embodiment, each of the lens units corresponds to one of the light source units 10. I.e. the lens array 23 also forms an array of M x N. And the optical axis of each lens unit is parallel to the optical axis of each light source unit 10. The lens array 23 is used for focusing the light beams emitted by the fly-eye lens assembly 22 to form a light spot array with fixed space intervals.
Continuing to refer to fig. 1, the optical assembly 20 preferably further includes collimating optics 21 positioned in the optical path of the light source 2. The collimating optics 21 is located between the light source 2 and the fly-eye lens assembly 22.
More preferably, the collimating optics 21 is a collimating lens array for collimating the light beams emitted from the light source unit 10 into M × N nearly parallel light beams.
More preferably, the collimating optics 21 correspond to the light source arrays one to one, and the optical axes coincide. I.e. the collimating optics 21 comprises collimating lenses, also arranged in an array of M x N, each collimating lens corresponding to one light source unit 10.
Preferably, the optical assembly 20 further comprises a wavelength conversion device 25. The wavelength conversion means is located on the optical path behind the lens array 23. The wavelength conversion device 25 is a transmissive wavelength conversion device or a reflective wavelength conversion device. The wavelength conversion device 25 receives light incident from the lens array 23 and emits a received laser beam. The wavelength conversion device 25, which includes a substrate and a wavelength conversion layer, can be rotated at a constant rate at a high speed. The substrate is used for bearing the wavelength conversion layer, and the wavelength conversion layer can be fluorescent powder which can generate broad spectrum light after being excited. The wavelength conversion device 25 can be driven to move circularly, so that the light spot formed by the light beam on the wavelength conversion layer acts on the wavelength conversion layer along a predetermined path to be converted into visible light with different wavelength.
Wherein the wavelength conversion layer can be divided into one or more sections. The plurality of segments may be specifically three segments, four segments, six segments, and the like. Each segment may be provided with a phosphor, and different phosphors may be used to convert incident light into visible light of different wavelengths. For example, the three-segment wavelength conversion layer can be used to convert blue light into red, green, and blue visible light. The four segments of wavelength converting layer can be used to convert excitation light of blue color to visible light of red, green, blue, and white. The six-segment wavelength conversion layer can be used to convert blue light into red, green, blue, red, green, and blue visible light.
The invention provides a light source system 1, which comprises a light source 2, wherein the light source 2 comprises a light source array formed by a plurality of light source units 10, and each light source unit 10 can be independently controlled to be bright or dark or/and switched on or switched off so as to realize local dimming (local dimming); the light beam emitted by the light source 2 directly passes through the fly eye lens assembly 22 and the lens array 23 positioned in the light emitting direction of the fly eye lens assembly 22, the fly eye lens assembly 22 can shape the light spot projected thereon into light spots with fixed intervals and emit the light spots from the emitting surface of the fly eye lens assembly 22, the lens array 23 is used for focusing the light beam emitted by the fly eye lens assembly 22 to form a light spot array with fixed intervals in space, the projection effect is prevented from being influenced by inconsistent intervals among the light spots, and when the light source system 1 is used as a light source of a projection system, high dynamic range display can be realized.
Referring to fig. 2-3, fig. 2 is a block diagram of a projection system 100 according to a second embodiment of the invention, and fig. 3 is a schematic structural diagram of the projection system 100 according to the second embodiment of the invention. The projection system 100 includes a light source system 1a, a spatial light modulator 4, and an optical lens 5.
The light source system 1a provided in the second embodiment is basically the same as the light source system 1 provided in fig. 1 in structure, and the differences mainly lie in that: the optical assembly 20a of fig. 3 differs somewhat from the optical assembly 20 of fig. 1 in structure. In the present embodiment, the optical unit 20a includes a first relay lens group 24, a light-receiving relay lens group 26, a second relay lens group 27, and a light-combining device 28 in addition to the collimating optics 21, the fly-eye lens assembly 22, the lens array 23, and the wavelength conversion device 25.
The first relay lens group 24 is disposed between the lens array 23 and the wavelength conversion device 25. The first relay lens group 24 is composed of one or more convex lenses and/or one or more concave lenses. In this embodiment, the first relay lens group 24 is formed by sequentially arranging three plano-convex lenses on the light-emitting path of the lens array 23, the convex surfaces of two plano-convex lenses close to the lens array 23 are opposite to each other, and the convex surface of the plano-convex lens far away from the lens array 23 is arranged toward the lens array 23. The plano-convex mirrors may be of different sizes to meet different beam processing requirements. The first relay lens group 24 is used for relaying the square light spot emitted by the optical assembly 20 to the wavelength conversion device 25. In the present embodiment, the first relay lens group 24 can also perform a function of compressing the light spot, and compress and project the light beam emitted from the lens array 23 to ensure uniformity of the light spot. The light receiving relay lens group 26 is disposed in the light outgoing direction of the wavelength conversion device 25. The light receiving relay lens group 26 is configured to collect and project the primary light converted by the wavelength conversion device 25. In this embodiment, the light-collecting relay lens group 26 is composed of a convex lens.
The second relay lens group 27 is disposed in the light exit direction of the light collection relay lens group 26. The second relay lens group 27 is composed of one or more convex lenses and/or one or more concave lenses. In this embodiment, the second relay lens group 27 is composed of two plano-convex mirrors, and the convex surfaces of the two plano-convex mirrors are arranged oppositely.
In the present embodiment, the first relay lens group 24, the wavelength conversion device 25, the light receiving relay lens group 26, and the second relay lens group 27 do not change the distribution shape of the light spot projected thereon.
The light combining device 28 is located in the light emitting direction of the second relay lens group 27, and the light combining device 28 receives and combines the light beams of the second relay lens group 27.
The spatial light modulator 4 is disposed on the light combining path of the light combining device 28. The optical lens 5 is disposed in the light exit direction of the spatial light modulator 4. It is understood that the spatial light modulator 4 may be a Digital Micromirror Device (DMD) spatial light modulator, a reflective liquid crystal panel (Lcos) spatial light modulator, or an LCD spatial light modulator, etc. Under the control of the control unit 3, the spatial light modulator 4 modulates the light beam projected on its surface to obtain image light.
The spatial light modulator 4 modulates the light beam projected on the spatial light modulator 4 to obtain image light. The optical lens 5 is configured to project a display image according to the image light.
Referring to fig. 4-6, fig. 4-6 illustrate a rectangular illumination spot array formed on the spatial light modulator 4, and are illustrated by taking spots generated by 4 light source units 10 as an example. Fig. 4 is a schematic diagram of a light spot generated by the projection system 1 provided in fig. 2. Fig. 5 is a schematic view of the spot array in the case where one light source unit 10 is turned off. Thus, the current/voltage intensity or/and on/off of each light source unit 10 can be independently controlled to achieve local dimming. Fig. 6 is a diagram showing the relationship between the size of the illumination light field, the size of the light spot, and the gap between the light spots. That is, the size and the spacing of the light spots in the light spot array can be controlled by controlling the size and the spacing of the microlenses 222 included in the fly-eye lens assembly 22, so as to achieve the homogenization of the illumination light field. Specifically, in the projection system 100, the illumination light field of the light source 2 needs to cover all areas of the spatial light modulator 4, and thus the ratio of Dx and Dy may be the same as the aspect ratio of the spatial light modulator 4 to adapt the light source array formed by the light source 2 to the desired spatial light modulator 4.
Each light source unit 10 forms a light spot having a width W and a height H satisfying: w = f 2 /(f 1 /w)，H＝f 2 /(f 1 H), wherein f is defined 1 Is the focal length of the microlens, f 2 Is the focal length of the lens unit, and w and h are the length and width of the microlens; and W = d x -Δx，H＝d y -ay, where Dx and Dy are the distances between the array of spots formed by the light source 2 arranged in the length and width directions, dx = Dx/N, dy = Dy/M, dx and Dy representing the length and width N of the field of illumination, M being the number of the array of spots in the width and length directions, respectively; Δ x and Δ y represent the dimensions of the gap between adjacent rectangular spots in the transverse and longitudinal directions, respectively. The value range of delta x is 5-70% of dx, and the value range of delta y is 5-70% of dy. Satisfying this condition can avoid the gap between the spots being too large, or the spots overlapping, so that uniform illumination spots and picture contrast can be formed on the spatial light modulator 4.
Referring to fig. 7, the operation principle of the projection system 100 of the present invention is:
step 401: an image to be displayed is input into the projection system 100.
Step 402: the control unit 3 receives the image to be displayed.
Step 403: the light source 2 is partitioned and the image is divided according to the light source partition to obtain a plurality of image partitions, for example, the image is divided according to the number of light source units 10 included in the light source 2 to obtain a plurality of image partitions. The number of light source units 10 may correspond one-to-one to the number of image partitions.
Step 404: the control unit 3 is further configured to calculate a peak luminance for each image partition from the image to be displayed.
Step 405: the control signal required for dimming of each light source unit 10 is generated according to the peak luminance of the image partition.
Step 406: the light source control signal is fed back to the light source 2, and the on/off of each light source unit 10 of the light source 2 and the light emission luminance of each light source unit 10 are controlled according to the control signal.
Step 407: the control unit 3 also predicts the distribution of the illuminance formed by the light source 2 on the basis of the control signal that needs to be dimmed for each image partition.
Step 408: the illuminance distribution is compared with the raw image data to generate a compensation control signal.
Step 409: the control unit 3 modulates the brightness corresponding to the light beam emitted by the light source 2 according to the compensation control signal to obtain image light, and the image light is projected to the spatial light modulator, so that a picture with a high dynamic range is projected and displayed through the optical lens 5.
Referring to fig. 8, fig. 8 is a projection system 200 according to a third embodiment of the invention. The projection system 200 provided in the third embodiment is substantially the same as the projection system provided in the second embodiment, that is, the projection system 200 includes a light source system 1b, a spatial light modulator 4 and an optical lens 5. The light source system 1b includes a light source 2, an optical assembly 20b, and a control unit 3. The difference is that the optical assembly 20b of fig. 6 has a structure that is somewhat different from the optical assembly 20a of fig. 3. The optical assembly 20a also includes the collimating optics 21, the fly-eye lens assembly 22, the lens array 23, the first relay lens group 24, the wavelength conversion device 251, the light-collecting relay lens group 26, the second relay lens group 27, and the light combining device 28. However, in the present embodiment, the wavelength conversion device 251 included in the optical unit 20b is a reflective wavelength conversion device, and the optical unit 20b further includes a light guide element 29 and a third relay lens group 30 in order to smoothly relay the light spot from the wavelength conversion device 251 to the light receiving relay lens group 26 in the optical unit 20 b.
The third relay lens group 30 is disposed opposite to the first relay lens group 24. The light guide element 29 is disposed on the optical path between the first relay lens group 24 and the third relay lens group 30. The light directing element 29 comprises a filter having a central membrane and an edge membrane. The central diaphragm and the edge diaphragm may be a unitary diaphragm or separate diaphragms. The central diaphragm of the optical filter transmits the light beam from the unit first relay lens group 24, and the edge diaphragm of the optical filter is a reflection diaphragm. The edge membrane reflects the visible light converted by the wavelength conversion device 25. In this embodiment, the central film of the optical filter is blue-transparent and yellow-reflective, and the edge film of the optical filter is a reflective film.
The third relay lens group 30 is composed of one or more convex lenses and/or one or more concave lenses. In the present embodiment, the third relay lens group 30 includes 3 lenses including a plano-convex mirror facing the light guiding element 29 and two concave-convex mirrors facing the wavelength changer 251. The array of square spots emanating from the optical assembly 20 is relayed to the light directing element 29 by the first relay lens group 24, transmitted through the light directing element 29, directed by the third relay lens group 30 into the wavelength conversion device 251. The wavelength conversion device 251 converts and emits visible light of another wavelength. The light beam emitted from the wavelength conversion device 251 passes through the third relay lens group 30 again, and is then reflected by the edge film of the light guide element 29, until being received by the light receiving relay lens group 26. The optical path after passing through the light receiving relay lens group 26 is the same as the optical path after passing through the light receiving relay lens group 26 in the projection system 100 provided in the first embodiment, and is not described again here.
Referring to fig. 9, fig. 9 is a projection system 300 according to a fourth embodiment of the invention. The projection system 300 provided in the fourth embodiment is substantially the same as the projection system 100 provided in the second embodiment, that is, the projection system 300 includes a light source system 1c, a spatial light modulator 4 and an optical lens 5. The light source system 1c includes a light source 2, an optical assembly 20c, and a control unit 3. The difference lies in that: the optical assembly 20d of fig. 8 is configured somewhat differently than the optical assembly 20c of fig. 7. The optical assembly 20d includes the collimating optics 21, the fly-eye lens assembly 22, the lens array 23, a first relay lens group 24, a wavelength conversion device 25, a light-collecting relay lens group 26, a second relay lens group 27, and a light combining device 28. The optical assembly 20c further comprises a spot compression lens array 31 arranged between the light source 2 and the collimating optics 21. The spot compression lens array 31 may be an array composed of mirrors, or an array composed of positive and negative lenses. In this embodiment, the light spot compression lens array 31 includes a plano-convex mirror and a plano-concave mirror located in the light emitting direction of the light source, and the convex surface of the plano-convex mirror is opposite to the concave surface of the plano-concave mirror. The light spot compression lens array 31 receives the light spots emitted from the light source 2, and compresses the light spots to obtain a light spot array with a smaller area, so as to avoid uneven light emission caused by overlapping of the light spots. The light spot is homogenized by the optical assembly 20 after passing through the light spot compression lens array 31 to obtain a uniform light spot array.
Referring to fig. 10, fig. 10 is a projection system 400 according to a fifth embodiment of the present invention, the projection system 400 according to the fifth embodiment is substantially the same as the projection system 300 according to the fourth embodiment, that is, the projection system 400 includes a light source system 1d, a spatial light modulator 4 and an optical lens 5. The light source system 1d includes a light source 2, an optical assembly 20d, and a control unit 3. The difference lies in that: the optical assembly 20d of fig. 8 is configured somewhat differently than the optical assembly 20c of fig. 7. The optical assembly 20d of fig. 8 includes a collimating optical device 21, the fly-eye lens assembly 22, the lens array 23, a first relay lens group 24, a wavelength conversion device 25, a light-collecting relay lens group 26, a second relay lens group 27, a light combining device 28, and a spot compression lens array 31. The optical assembly 20d further includes a diffusion sheet 32 disposed between the light-receiving relay lens group 26 and the second relay lens group 27. The diffuser 32 is used to further homogenize the light beam of the light receiving relay lens group 26 to obtain a uniform light spot. It will be appreciated that when the pitch of the illumination spots emerging from the lens array 23 matches the spreading effect of the wavelength conversion device 25 on the spots, and the spots emerging from the wavelength conversion device 25 are already uniform, the diffuser 32 may be omitted.
In summary, in the light source systems 1, 1a, 1b, and 1c and the projection systems 100, 200, 300, and 400 formed by the light source systems, respectively, provided by the present invention, since the light source system includes a light source, each light source unit 10 included in the light source can be independently controlled to be turned on or off or to be turned off or on or off to implement local dimming; the light beam emitted by the light source 2 directly passes through the fly-eye lens assembly 22 and the lens array 23 positioned in the light-emitting direction of the fly-eye lens assembly 22, the light source is separated to form an independent light source unit 10, and then the independent light source unit 10 is controlled, so that high dynamic range display is realized. Meanwhile, the optical device of the light source system is simple to process, so that the process is simplified.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units or means recited in the apparatus claims may also be embodied by one and the same item or means in software or hardware.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (14)

1. A light source system, comprising: a light source, an optical assembly and a control unit; the light source includes a light source array formed of a plurality of light source units; the control unit is used for independently controlling each light source unit;
the optical assembly comprises a fly-eye lens assembly and a lens array which are sequentially arranged on the light path of the light source; the fly-eye lens assembly comprises a fly-eye lens pair or a single fly-eye lens; the lens array comprises a plurality of lens units arranged in an array, and each lens unit corresponds to at least one light source unit;
the fly-eye lens comprises a plurality of micro lenses arranged in an array, the micro lenses are rectangular, and light emitted by each light source unit forms a rectangular light spot after passing through the micro lenses; the width W and the height H of the light spot satisfy W = f 2 /(f 1 /w) and H = f 2 /(f 1 H), definition of f 1 Is the focal length of the microlens, f 2 Is the focal length of the lens unit, W and h are the length and width of the microlens, and W = d x -Δx，H＝d y -ay, where Dx and Dy are the distances between the light source units forming the spots arranged in the length and width directions, dx = Dx/N, dy = Dy/M, dx and Dy represent the length and width of the illuminated light field, dx and Dy are in the same ratio as the aspect ratio of the spatial light modulator, and N, M are the numbers of the light source array in the width and length directions, respectively; Δ x and Δ y represent the dimensions of the gap between adjacent rectangular spots in the transverse and longitudinal directions, respectively.
2. The light source system according to claim 1, wherein the light source unit is a laser or a light emitting diode.
3. The light source system of claim 1, wherein the light source comprises M x N light source units.
4. The light source system of claim 1, further comprising collimating optics positioned between the light source and the fly-eye lens assembly.
5. The light source system of claim 4, wherein the collimating optics is a collimating lens array configured to collimate light from the light source into M x N approximately parallel beams.
6. The light source system according to claim 5, wherein the collimating lens array corresponds to the light source array one to one, and an optical axis of each collimating lens in the collimating lens array coincides with an optical axis of each light source unit.
7. The light source system of claim 1, wherein the fly-eye lens assembly is a single-piece double fly-eye lens or a double-piece single fly-eye lens.
8. The light source system according to claim 7, wherein the microlenses of the single-piece double fly-eye lens or two fly-eye lenses opposite to the single-piece double fly-eye lens are in one-to-one correspondence.
9. The light source system of claim 8, wherein the distance between two microlenses in a one-to-one correspondence is equal to the focal length of the microlenses.
10. The light source system of claim 1, further comprising a wavelength conversion device positioned in the optical path after the lens array.
11. The light source system according to claim 1, wherein the control unit controls on/off of each of the light source units and/or controls current/voltage intensity of each of the light source units.
12. The light source system according to claim 1, wherein each of the lens units corresponds to one of the light source units, and an optical axis of each of the lens units is parallel to an optical axis of each of the light source units.
13. The light source system of claim 1, wherein Δ x ranges from 5% to 70% of dx and Δ y ranges from 5% to 70% of dy.
14. A projection system, characterized by: the projection system comprises a light source system, a spatial light modulator and a lens system, wherein the spatial light modulator is positioned on a light emitting path of the light source system, and the lens system is positioned on a light path of the spatial light modulator, and the lens system comprises: the light source system is the light source system according to any one of claims 1 to 13; the control unit is electrically connected with the light source and the spatial light modulator, and the lens system is used for projecting the light field modulated by the spatial light modulator onto a projection screen.
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