CN108628069B - Projection system - Google Patents

Projection system Download PDF

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Publication number
CN108628069B
CN108628069B CN201710174941.0A CN201710174941A CN108628069B CN 108628069 B CN108628069 B CN 108628069B CN 201710174941 A CN201710174941 A CN 201710174941A CN 108628069 B CN108628069 B CN 108628069B
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China
Prior art keywords
light
projection
color
module
polarization state
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CN201710174941.0A
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CN108628069A (en
Inventor
郭祖强
胡飞
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to CN201710174941.0A priority Critical patent/CN108628069B/en
Priority to PCT/CN2017/081312 priority patent/WO2018170987A1/en
Publication of CN108628069A publication Critical patent/CN108628069A/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
    • G03B21/2006—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
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

The present invention relates to a projection system. The projection system comprises a light source device, a light modulation module, a projection lens and a light recovery module. The light source device comprises a first light source and a second light source, wherein the first light source is used for emitting first light, and the first light is used for modulating an image in a first color gamut range; the second light source is configured to emit complementary light that widens a color gamut of at least one of the excitation lights emitted by the first light source, the complementary light being configured to modulate an image in a second color gamut range in cooperation with the first light. The light modulation module is used for carrying out image modulation on light emitted by the light source device according to image data so as to generate non-projection light and projection light required by an image to be displayed, and the projection lens is used for receiving the projection light so as to project the image. The light recycling module is used for recycling the non-projection light to the light modulation module for reuse. The projection system has the advantages of wide color gamut range, good image effect and high light utilization rate.

Description

Projection system
Technical Field
The invention relates to the technical field of projection, in particular to a projection system.
Background
The projection systems are classified into dmd (digital micro mirror device), lcos (liquid Crystal on silicon), lcd (liquid Crystal display), etc. according to the types of light modulation modules used in the projection systems, and are classified into single-chip, two-chip, and three-chip systems according to the number of light modulation modules. In terms of light sources of projection systems, conventional light sources include lamp light sources such as UHP and xenon lamps, and LED light sources, RGB pure laser light sources, and laser excited phosphor light sources are gradually developed, and the latter can be regarded as light sources based on semiconductor light emitting devices. The projection system of the LED light source is limited by optical expansion, has insufficient brightness, and is limited in application in many fields, especially cinema occasions with higher requirements on brightness. The existing common contrast difference lies in an RGB laser light source and a laser phosphor light source, the RGB laser light source has the advantages of high color purity and wide color gamut, and generally can reach the REC2020 color gamut standard, but the speckle problem is difficult to solve, the laser excited phosphor light source has no speckle problem, the visual performance is good, and generally can reach the DCI standard in the aspect of color gamut. For the vast majority of cases where the image is actually viewed, the DCI gamut is already sufficient. It is assumed that the captured image is from nature, living surroundings, etc., we can see that the object has a certain color, and the spectrum from its reflection will generally be a relatively continuous spectrum with a certain width, so the object color will fall within the DCI color gamut unless there is a case: the photographing device directly photographs pure laser beams, such as a 532nm green laser beam and a 638nm red laser beam, at this time, the DCI color gamut cannot restore the intrinsic colors of the two laser beams, which is also considered as a place where the laser fluorescence light source is not as good as the RGB pure laser light source, so how to make the laser fluorescence light source have the characteristics of exceeding the DCI color gamut and maintaining high light efficiency thereof becomes a challenging subject.
The existing pure laser projector can realize the large color gamut range of the REC2020, while the color gamut range of the projector of the laser phosphor technology is DCI709, although most colors in nature are in the DCI color gamut range, under a specific condition, for example, when displaying the color of pure laser, the color is located outside the DCI color gamut, and when displaying the color, the projector of the existing laser phosphor technology can make the color display beyond the DCI color gamut be not vivid.
With the development of laser projection technology, the projection picture with high fidelity also becomes a reference standard for consumers to chase projection products. The color gamut range of the existing laser phosphor technology meets the requirement of conventional color display in the natural world, but for special image colors, the image colors are out of the DCI color gamut, and if the DCI color gamut is adopted for display, the colors out of the DCI color gamut can only be displayed by the colors on the boundary of the DCI color gamut, but different color differences cannot be reflected. Eventually distorting the color display that is not within the DCI color gamut.
Disclosure of Invention
In order to solve the technical problem that the projection system in the prior art cannot display a specific color gamut, the invention provides a projection system capable of effectively widening the color gamut.
A projection system, comprising:
the light source device comprises
A first light source for emitting first light for modulating an image, the first light for modulating an image in a first color gamut range; and
a second light source for emitting complementary light that widens a color gamut of light of at least one color of the first light emitted by the first light source, the complementary light being for modulating an image in a second color gamut range in cooperation with the first light;
the light modulation module is used for carrying out image modulation on the light emitted by the light source device according to the image data so as to generate non-projection light and projection light required by an image to be displayed;
a projection lens for receiving the projection light to project an image; and
and the light recycling module is used for recycling the non-projection light to the light modulation module for reuse.
Compared with the prior art, in the projection system, the second light source can emit the supplementary light for widening the color gamut of the projection system, and the light modulation module modulates the supplementary light to generate the projection light, so that the color gamut of a projected image is effectively widened, and the phenomenon of picture color distortion is improved, therefore, the projection system has the advantages of wide color gamut range, vivid picture color and good display effect. In addition, the projection system is also provided with a light recycling module, and the light recycling module can recycle the non-projection light to the light modulation module for reuse, so that the light utilization rate of the projection system can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a projection system according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a color wheel of the projection system shown in fig. 1.
Fig. 3 is a schematic diagram of the gamut range of the projection system shown in fig. 1.
Fig. 4 is a schematic structural diagram of a first light combining element of the projection system shown in fig. 1.
Fig. 5 is a schematic structural diagram of a projection system according to a second embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a projection system according to a third embodiment of the present invention.
Fig. 7 is a schematic diagram of a color wheel of the projection system shown in fig. 6.
Fig. 8 is a schematic structural diagram of a projection system according to a fourth embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a projection system according to a fifth embodiment of the present invention.
Description of the main elements
Projection system 100, 200, 300, 400, 500
Light source device 110, 210, 310
Light source controller 120
Light processing elements 130, 230, 316, 317, 319c, 419a, 419c
Light modulation modules 140, 240, 340
Color gamut determination modules 150, 350
Light recovery modules 160, 260, 360
Projection lens 170, 370, 470, 570
First light source 111, 211, 311, 411
Second light source 112, 212, 312, 412
First light combining elements 113, 213
Light emitting elements 114, 214
Color wheel 115, 215, 315
First segmented region B
Second section area R, Y
Third segment region G
Spectral modules 161, 261, 361, 461, 561
The optical path modules 162, 262, 362, 462, 562
First region 113a
Second region 113b
Guide elements 163, 263, 264, 363, 319b, 419b, 463, 464, 465, 582
Second light combining element 164
First gamut F1
Second gamut F2
Spectroscopic elements 313, 413, 513
Light combining elements 318, 418
Polarization beam splitter 481, 581
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection system 100 according to a first embodiment of the invention. The projection system 100 includes a light source device 110, a light source controller 120, a light processing element 130, a light modulation module 140, a color gamut determination module 150, a light recycling module 160, and a projection lens 170.
The light source device 110 includes a first light source 111, a second light source 112, and a first light combining element 113. The first light source 111 is used to emit first light, which is used to modulate an image and which is capable of modulating an image within a first color gamut F1. The second light source 112 is configured to emit supplementary light that widens the color gamut of the light of at least one color of the first light emitted by the first light source 111, and the supplementary light is configured to modulate an image in the second color gamut range F2 together with the first light. The first light combining element 113 is configured to combine the first light and the supplemental light, so that the light source device 110 emits a combined light of the first light and the supplemental light as the light emitted by the light source device 110.
The first light source 111 includes a light emitting element 114 and a color wheel 115, the light emitting element 114 is configured to emit an excitation light, the color wheel 115 is located on a light path of the excitation light emitted by the light emitting element 114, the color wheel 115 includes at least two segment regions, the at least two segment regions receive the excitation light and emit the first light correspondingly, wherein the first light includes at least two colors of light, and each segment region emits one color of light correspondingly.
In this embodiment, the light emitting element 114 is an excitation light source, and emits the excitation light under the control of the light source controller 120. The light emitting element 114 may be disposed at one side of the color wheel 115. Further, the light emitting element 114 may be a blue light source emitting blue excitation light, but it is understood that the light emitting element 114 is not limited to the blue light source, and may be a red light source, a green light source, an ultraviolet light source, or the like. In this embodiment, the light emitting element 114 includes a blue laser for emitting blue laser as the excitation light, and it is understood that the light emitting element 114 may include one, two or more blue lasers, and the number of the lasers may be selected according to actual needs.
Referring to fig. 2, fig. 2 is a schematic structural diagram of the color wheel 115 shown in fig. 1. The color wheel 115 includes at least two segment regions (e.g., R, G, B) arranged along a circumferential direction, each segment region for emitting light of one color. The color wheel 115 may rotate along the center of the color wheel 115, such that the at least two segment regions (e.g., R, G, B) are periodically located on the optical path of the excitation light emitted from the light emitting element 114, and thus the at least two segment regions (e.g., R, G, B) periodically emit at least two colors of light as the first light. It is understood that the area sizes of the at least two segment regions (e.g., R, G, B) can be set to be the same or different according to actual needs.
In this embodiment, the color wheel 115 includes three segment regions, namely, a first segment region B, a second segment region R, and a third segment region G, which are sequentially arranged in the circumferential direction. The first segment region B is used for emitting a first color light, such as blue light, and when the light emitting device is a blue light source, a scattering material may be disposed on the first segment region B, and the light emitted by the light emitting device 114 may be emitted after being scattered by the first segment region B. In a modified embodiment, when the light emitting element 114 is an ultraviolet light source, a first wavelength conversion material may be disposed on the first segment region B, and the light emitted by the light emitting element 114 may excite the first wavelength conversion material to generate the first color light, such as blue light.
The second segment region R is used for emitting a second color light, such as a red light, and a second wavelength conversion material, such as a red phosphor, may be disposed on the second segment region R, and the light emitted from the light emitting element 114 may excite the second wavelength conversion material to generate the second color light, i.e., the red light; the third segment region G is used for emitting a third color light, such as green light, and a third wavelength conversion material, such as green phosphor, may be disposed on the third segment region G, and the light emitted from the light emitting element 114 may excite the third wavelength conversion material to generate the third color light, i.e., green light. Of course, in the modified embodiment, the number of the segment regions of the color wheel 115 may be two (for example, two segment regions emitting blue light and yellow light, respectively), four (for example, four segment regions emitting blue, green, yellow, and red light, respectively), five, six, or the like, but is not limited to the above, and two or more segment regions of the color wheel 115 may emit light of the same color, or the like, that is, the number of the segment regions of the color wheel 115, the color of the emitted converted light, or the like may be selected according to actual needs.
It is to be understood that in an alternative embodiment, the light emitting element 114 may directly emit the first light, for example, the light emitting element 114 includes at least two colors of light emitting elements, so that the color wheel 115 may be omitted. In this embodiment, the color wheel 115 is a transmissive color wheel, that is, one side of the color wheel 115 receives the excitation light and the other side emits the first light, and the first light is guided to the first light combining element 113, but in a modified embodiment, the color wheel 115 may also be a reflective color wheel, that is, the same side of the color wheel 115 receives the excitation light and emits the first light, and the first light is guided to the first light combining element 113; or, the color wheel 115 may also be a reflective color wheel or a semi-transmissive and semi-reflective color wheel (for example, a part of the segment area is a transmissive area, and another part of the segment area is a reflective area), and when the color wheel 115 is a reflective color wheel or a semi-transmissive and semi-reflective color wheel, the optical path and the positional relationship between the light emitting element and the color wheel may also be designed and adjusted according to actual needs, and the optical path and the positional relationship between the color wheels of different types and the light emitting element will not be described herein again.
The second light source 112 is a supplementary light source, which emits supplementary light under the control of the light source controller 120. In this embodiment, the second light source 112 is disposed on a side of the color wheel 115 opposite to the first light source 111, that is, the light emitting element 114 and the second light source 112 are located on different sides of the color wheel 115, light emitted by the light emitting element 114 is converted into first light through the color wheel 115 and then provided to the first light combining element 113, and supplementary light emitted by the second light source 112 is guided to the first light combining element 113, so that the first light and the supplementary light are combined at the first light combining element 113. Of course, in an alternative embodiment, the light emitting element 114 and the first light source 111 may be disposed on the same side of the color wheel 115, for example, the excitation light emitted from the light emitting element 114 and the supplementary light emitted from the second light source 112 are both guided to the color wheel 115, and the first light and the supplementary light are emitted from the color wheel 115 as the light emitted from the light source device 110.
Specifically, the second light source 112 may include at least one laser for emitting laser light of at least one color as the supplement light. In one embodiment, the second light source 112 may include a first laser and a second laser, which respectively emit a first supplementary light and a second supplementary light, and the first supplementary light and the second supplementary light are different in color. However, in a modified embodiment, the second light source 112 may include only one laser and emit only one color of complementary light; alternatively, the second light source 112 may include three lasers for emitting light of three colors. It is to be understood that the type of the laser or the number of the complementary light colors of the second light source may be determined according to the color gamut to be widened, for example, the red color gamut is widened, the second light source 112 may include a red laser emitting a red complementary light, for example, the green color gamut is widened, the second light source 112 may include a green laser emitting a green complementary light, for example, the red color gamut and the green color gamut are widened, and the second light source may include a red laser emitting a red complementary light, and further include a green laser emitting a green complementary light.
In this embodiment, the light emitting element 114 is a blue laser, the color wheel 115 is provided with a fluorescent material for receiving blue excitation light (e.g., blue laser light) emitted by the light emitting element 114 and emitting first light, where the first light may include the blue excitation light emitted by the light emitting element 114 or the scattered blue excitation light, and red light and green light generated by the fluorescent material excited by the blue excitation light. Correspondingly, the second light source 112 includes a first laser emitting red supplemental light and a second laser emitting green supplemental light. The number of the first laser and the second laser may also be one, two or more, and may be specifically selected according to actual needs.
The color gamut determining module 150 is configured to receive image data, determine a color gamut range of an image to be displayed (e.g., a sub-frame image to be displayed, specifically, a sub-frame red image data corresponding to a red image or a sub-frame green image data corresponding to a green image, etc.) according to the image data (e.g., a sub-frame image data, specifically, a sub-frame red image to be displayed or a sub-frame green image to be displayed, etc.), and output a control signal according to the color gamut range to control the first light source and the second light source to be turned on and off through the light source controller 120.
Specifically, if the color gamut determining module 150 determines that the color gamut range of the image to be displayed falls within a first color gamut range F1, and the first color gamut range F1 is the color gamut range that the first light can exhibit, the color gamut determining module 150 outputs a control signal to the light source controller 120 to control the first light source 111 to be turned on, and the light modulating module 140 modulates the first light to generate the projection light according to the image data.
If the color gamut determining module 150 determines that at least a portion of the color gamut range of the image to be displayed is in a second color gamut range, the second color gamut range is outside the first color gamut range, and the second color gamut range is within the color gamut range that the supplemental light and the first light can be shown together, and that is, the image data in the second color gamut range can be formed by projecting the first light emitted by the first light source and the second light emitted by the second light source together, the color gamut determining module 150 outputs a control signal to the light source controller 120 to control at least the second light source 112 to be turned on (that is, only the first light source 111 can be controlled to be turned on or both the first light source 111 and the second light source 112 can be controlled to be turned on), the light modulation module 140 modulates at least the supplemental light according to the image data (when both the first light source 111 and the second light source 112 are turned on, i.e., modulating the first light and the supplemental light) to generate the projected light.
Further, referring to fig. 3, in this embodiment, the first gamut F1 may be a gamut that the first light can exhibit, and may be a DCI gamut, such as gamut DCI709, and after the second light source 112 is set, the supplementary light emitted by the second light source 112 may emit light exceeding the first gamut F1, specifically, the supplementary light emitted by the second light source 112 may exhibit a REC gamut F, such as gamut REC2020, which may be wider than the first gamut F1, such as gamut range REC 2020. A second gamut range F2 is defined, the second gamut range F2 being a REC gamut range outside the first gamut range F1 and being a gamut range that the supplemental light can exhibit.
Specifically, in one embodiment, the first light may include red fluorescence and green fluorescence generated by exciting red and green wavelength conversion materials on the color wheel 115 by the blue laser of the light emitting element 114, and the blue laser of the light emitting element transmitted, scattered or reflected by the color wheel 115. Since the red fluorescence and the green fluorescence are obtained by exciting the wavelength conversion material, not pure laser light, of the light of the at least two colors, the color gamut of the red light and the green light of the at least two colors is narrow, and only the color gamut of the DCI709 (i.e., the first color gamut) can be displayed, and the blue light emitted by the color wheel 115 is the blue laser light emitted by the light emitting element 114, so that the problem of narrow color gamut of the blue light generally does not exist, and therefore, in this embodiment, the second light source 112 includes a red laser and a green laser that respectively emit complementary light of the red laser and the green laser to widen the color gamut.
It is to be understood that the gamut determining module 150 may analyze the gray-scale value of each sub-frame image DATA of the image DATA to calculate the color gamut value after mixing of the sub-frame image DATA, so as to determine whether the color gamut value falls within the first color gamut range F1 or the second color gamut range F2. The color gamut determination module 150 may be integrated into an image DATA processing module of the projection system 100, where the image DATA processing module receives the image DATA, decompresses the image DATA, and calculates the color gamut value based on the gray-scale value of each sub-frame image DATA to determine the color gamut range of the image to be displayed.
The light source controller 120 is configured to receive a control signal output by the color gamut determining module 150 according to the determination result to control the on and off of (the light emitting element of) the first light source 111 and the second light source 112, so that the color gamut range, which can be modulated by the light emitted from the first light source 111 and the second light source 112, satisfies the color gamut range of the image to be displayed.
The light processing component 130 may include at least one of a light homogenizing component (e.g., a light homogenizing rod, a fly-eye lens), a collecting lens, a relay lens, and the like, and the light processing component may be configured to homogenize the first light and the supplemental light emitted by the light source device 110 and/or change a light path, and/or collect, diffuse, shape, and the like the first light and the supplemental light so that the first light and the supplemental light are irradiated onto the light modulation module according to a predetermined spot size. In this embodiment, the light processing element 130 includes a dodging element (e.g., a fly-eye lens) for dodging the first light emitted from the light source device 110 and the complementary light (i.e., the combined light emitted from the first light combining element) and providing the dodged first light and complementary light to the light modulation module 140.
The light modulation module 140 is configured to perform image modulation on the first light and the supplemental light according to the image DATA, respectively, to generate projection light required for projecting an image. The light modulation module 140 may include at least one of a DMD spatial light modulator, an LCOS spatial light modulator, and an LCD spatial light modulator. The projection lens 170 is used to receive the projection light to project an image.
It will be appreciated that the light modulation module 140 also generates non-projected light that is not used to project an image. The light recycling module 160 is configured to recycle the non-projection light to the light modulation module 140 for reuse, and specifically, the light recycling module 160 may recycle the non-projection light to the light modulation module 140 for reuse via the light source device 110. Specifically, the light recycling module 160 may include a light splitting module 161 and a light path module 162, where the light splitting module 161 is configured to receive the projected light and the non-projected light emitted by the light modulation module 140, guide the projected light to the projection lens 170, and guide the non-projected light to the light source device 110 via the light path module 162, so that the light source device 110 guides the non-projected light to the light modulation module 140 for reuse. Specifically, the light splitting module 161 may transmit the projected light emitted from the light modulation module 140 to the projection lens 170, and reflect the non-projected light emitted from the light modulation module 140 to the optical path module 162. The optical path module 162 guides the non-projection light to the first light combining element 113, and the first light combining element 113 guides the first light and the supplemental light to the optical modulation module 140 and also guides all the non-projection light recycled by the light recycling module 160 to the optical modulation module 140, so that the optical modulation module 140 can reuse the recycled non-projection light.
Referring to fig. 4, in a first embodiment, the first light combining element 113 includes a first region 113a and a second region 113b, one of the first region 113a and the second region 113b is a light transmission region, the other one of the first region 113a and the second region 113b is a light reflection region, the first region 113a guides (e.g., reflects or transmits) both the supplemental light and the non-projected light to the light modulation module 140, and the second region 113b guides (e.g., transmits or reflects) the first light to the light modulation module 140. Specifically, as shown in fig. 4, the first region 113a is a reflective region, the second region 113b is a transmissive region, the first region 113a may be a rectangular region and located at the center of the first light combining element 113, and the second region 113b may be arranged around the first region 113a and be a rectangular annular region. The first region 113a receives the supplement light emitted by the second light source 112 and the non-projection light recovered by the light path module 162 and reflects the supplement light and the non-projection light to the light processing element 130, so that the light processing element 130 guides the processed supplement light and the non-projection light to the light modulation module 140. The second region 113b receives the first light and transmits the first light to the light processing element 130, and the light processing element 130 guides the processed first light to the light modulation module 140.
In this embodiment, the optical path module 162 may include a guiding element 163 (e.g., a reflecting element) and a second light combining element 164, where the guiding element 163 is configured to receive the non-projection light emitted by the light splitting module 161 and guide (e.g., reflect) the non-projection light to the second light combining element 164, the supplemental light emitted by the second light source 112 is also guided to the second light combining element 164, and the second light combining element 164 combines the non-projection light and the supplemental light and guides the combined light to the first light combining element 113. Specifically, the second light combining element 164 may transmit the supplemental light to the first light combining element 113, and reflect the non-projection light to the first light combining element 113. In a modified embodiment, if the light splitting module 161 can directly guide the non-projection light to the second light combining element 164, the guiding element 163 may be omitted, or the second light combining element 164 and the guiding element 163 exchange positions, and the second light combining element 164 receives the non-projection light and the supplementary light emitted by the light splitting module 161 and guides (e.g., reflects) both the non-projection light and the supplementary light to the guiding element 163 so as to be guided (e.g., reflected) to the first light combining element 113 by the guiding element 163.
Further, the second light combining element 164 is a polarization light combining element, and the second light combining element 164 is used for transmitting one of the light with the first polarization state and the light with the second polarization state and reflecting the other of the light with the first polarization state and the light with the second polarization state. It is understood that the light of the first polarization state may be referred to as S-polarized light, and the light of the second polarization state may be referred to as P-polarized light, or vice versa. In this embodiment, the second light combining element 164 guides (e.g., transmits) the supplementary light with the first polarization state emitted from the second light source 112 to the first light combining element 113, and the second light combining element 164 guides (e.g., reflects) the non-projection light with the second polarization state to the first light combining element 113. Correspondingly, the second light source 112 may emit the supplementary light with the first polarization state, or the second light source 112 includes a laser and a polarization element, the light emitted by the laser is converted into the supplementary light with the first polarization state by the polarization element, so that the second light combining element 164 guides the supplementary light with the first polarization state to the first light combining element 113. Furthermore, the non-projection light is preferably light with a second polarization state, that is, the non-projection light emitted by the light splitting module 161 or the light modulation module 140 is the light with the second polarization state; however, when the non-projection light emitted by the light splitting module 161 or the light modulation module 140 is light with a first polarization state, a polarization element (e.g., a polarization converter) may be added to the light path module 162 to convert the light with the first polarization state into light with a second polarization state and guide the light with the second polarization state to the second light combining element 164. Correspondingly, when the second light combining element 164 is a polarization light combining element, the light modulation module 140 is preferably an LCOS spatial light modulator or an LCD spatial light modulator, so as to achieve the purpose of effectively utilizing and recycling light with a polarization state.
In addition, in this embodiment, a condensing element (such as a collecting lens) may be further disposed between the second light combining element 164 and the first light combining element 113, so as to condense and project the light emitted from the second light combining element 164 to the first region 113a of the first light combining element 113, so that the first region 113a guides the supplemental light, i.e., the recovered non-projection light, to the light processing element 130 to be guided to the light modulation module 140, and the light modulation module 140 may modulate the supplemental light and modulate the recovered non-projection light in addition to modulating the first light according to the image data in the second color gamut F2, thereby reducing the light loss of the system and improving the light utilization efficiency of the system.
Compared with the prior art, in the projection system 100, since the second light source 112 can emit the supplementary light for widening the color gamut of the projection system 100, and the light modulation module 140 modulates the supplementary light to generate the projection light, the color gamut of the projected image is effectively widened, so that the phenomenon of picture color distortion is improved, and thus, the projection system 100 has a wider color gamut range, vivid picture colors and better display effect. In addition, the projection system 100 further has a light recycling module 160, and the light recycling module 160 can recycle the non-projection light to the light modulation module 140 for reuse, so as to improve the light utilization rate of the projection system 100.
Further, in a modified embodiment of the first embodiment, the first light combining element 113 may be modified as follows: the first region 113a may reflect light of a first polarization state and transmit light of a second polarization state, and both natural light may transmit; the second region 113b is transmissive to all light. Meanwhile, a polarization element (e.g., a polarization converter) may be disposed between the second light combining element 164 and the first light combining element 113, and the polarization element may transmit light in the first polarization state and convert the light in the second polarization state into light in the first polarization state, so that the supplemental light and the recycled non-projection light are both light in the first polarization state when reaching the first light combining element 113, and thus the first region 113a further reflects the supplemental light and the non-projection light to the light processing element 130, and further reaches the light modulation module 140 to reuse the effect of the non-projection light. It is understood that, in this embodiment, light having a first polarization state of the first light irradiated to the first region 113a is lost, and light having a second polarization state of the first light may be transmitted to the light processing element 130.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a projection system 200 according to a second embodiment of the invention. The projection system 200 of the second embodiment is substantially the same as the projection system 100 of the first embodiment, that is, the above description of the projection system 100 of the first embodiment is substantially applied to the projection system 200 of the second embodiment, and the main differences are as follows: the positions of the light path module 262, the first light combining element 213 and the second light source 212 of the light recycling module 260 are different from those of the first embodiment.
Specifically, in the second embodiment, the optical path module 262 includes two guiding elements (e.g., reflecting elements), the first light combining element 213 is a polarization light combining element, and the first light combining element 213 transmits light with a first polarization state and reflects light with a second polarization state. The first light emitted by the first light source 211 and the supplementary light emitted by the second light source 212 are both lights with a first polarization state or are converted into lights with the first polarization state by arranging a polarization element (such as a polarization converter), and the first light and the supplementary light are guided (transmitted) to the light processing element 230 by the first light combining element 213 and then reach the light modulation module 240. The light modulation module 240 may be an LCD or LCOS spatial light modulator, the non-projection light emitted therefrom is light with a second polarization state, the non-projection light with the second polarization state is guided to the light path module 262 by the light splitting module 261, the light path module 262 guides (reflects) the non-projection light with the second polarization state to the first light combining element 213, and the first light combining element 213 reflects the light with the second polarization state to the light processing element 230, so as to reach the light modulation module 240 for reuse.
It is to be understood that, in the modified embodiment of the second embodiment, the light emitting element 214 of the second light source 212 and the first light source 211 may be disposed on the same side of the color wheel 215, that is, the supplementary light emitted by the second light source 212 reaches the first light combining element 213 via the color wheel 215. If the non-projection light emitted from the light modulation module 240 or the light splitting module 261 is light with a first polarization state, a polarization element (e.g., a polarization converter) may be disposed in the light path module 262 to convert the non-projection light with the first polarization state into light with a second polarization state, and then guide the light to the first light combining element 214. In addition, similar to the first embodiment, the second light source 212 may emit the supplemental light with the first polarization state, or the second light source 212 includes a laser and a polarization element, the light emitted by the laser is converted into the supplemental light with the first polarization state by the polarization element, so that the first light combining element 213 guides the supplemental light with the first polarization state to the light processing element 230 and then to the light modulation module 240.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a projection system 300 according to a third embodiment of the invention. The projection system 300 is similar to the projection system 100 of the first embodiment in principle and structure, that is, the description of the projection system 100 of the first embodiment is fully applicable to the projection system 300, and the main differences are: the positions of the first light source 311 and the second light source 312, the optical path control elements (such as the positions and principles of the light splitting element and the light combining element) of the light source device 310, the number and principle of the spatial light modulators of the light modulation module 340, and the light splitting module 361 and the optical path module 362 of the light recycling module 360 are different.
Specifically, as shown in fig. 6, the first light emitted by the first light source 311 may include a first color light and a second color light, the first color light may be blue light, the second color light may be yellow light, and the first color light and the second color light may be sequentially provided. It can be understood that the first light source 311 includes a light emitting element 314 and a color wheel 315, and the structures of the light emitting element 314 and the color wheel 315 are substantially the same as those of the light emitting element 314 and the color wheel 315 in the first embodiment, and the differences between the two structures are mainly: as shown in fig. 7, in the present embodiment, the color wheel 315 includes two segment regions, which are a first segment region B and a second segment region Y. The first segment region B is similar to the first embodiment and is configured to scatter the blue excitation light emitted by the light emitting element 314 to emit blue light, the second segment region Y may be disposed with a yellow fluorescent material thereon, and the second segment region Y receives the blue excitation light emitted by the light emitting element 314 to generate yellow conversion light, so that the first light emitted by the color wheel 315 includes blue light and yellow conversion light, and it can be understood that, as described in the first embodiment, the color wheel 315 moves along the circumferential direction, so that the first and second segment regions are sequentially located on the optical path of the blue excitation light emitted by the light emitting element 314, and thus sequentially emit the blue light and the yellow conversion light as the first light.
The light source device 310 further includes light processing elements 316 and 317, a light splitting element 313 and a light combining element 318, and the color wheel 315 emits the first light and provides the first light to the light splitting element 313 through the light processing elements 316 and 317. It is understood that the light processing elements 316 and 317 are used for the first light to perform the processes of dodging and collecting, and may include a light dodging element 316 (such as a fly-eye lens) and a collecting lens 317 arranged in sequence, and it is understood that the light processing elements 316 and 317 may be omitted if the light emitted from the color wheel 315 does not need to be processed.
The light modulation module 340 includes a first spatial light modulator 341 and a second spatial light modulator 342, and the first spatial light modulator 341 and the second spatial light modulator 342 may be both LCOS spatial light modulators or LCD spatial light modulators. The light splitting element 313 may be a color splitter, the light splitting element 313 receives the first light for a first period of time and guides (e.g., reflects) a first color light (e.g., blue light) in the first light to a guiding element 319b (e.g., a reflecting element), and the guiding element 319b guides the first color light to the first spatial light modulator 341 so that the first spatial light modulator 341 modulates the first color light according to an image data of the first color to generate a projected light and a non-projected light of the first color.
The light splitting element 313 is further configured to direct a second color light (e.g., red light) of the converted light of the first light to any one of the first spatial light modulator 341 and the second spatial light modulator 342 for a second time period different from the first time period (e.g., the second time period may be adjacent to but not overlapping with the first time period) so that the any one spatial light modulator modulates the second color light to generate a projected light and a non-projected light of a second color according to image data of the second color. In this embodiment, the light splitting element 313 guides (e.g., reflects) the second color light (e.g., red light) in the converted light of the first light to the guiding element 319b (e.g., a reflecting element), and the guiding element 319b guides the second color light to the first spatial light modulator 341 so that the first spatial light modulator 341 modulates the second color light according to the image data of the second color to generate the projection light and the non-projection light of the second color.
Further, while the light splitting element 313 also directs (e.g., transmits) the third color light (e.g., green light) in the converted light of the first light to the first spatial light modulator 341 in the second time period, the light splitting element 313 also directs (e.g., transmits) the third color light (e.g., green supplemental light) emitted by the second light source 312 to the light combining element 318, and the light combining element 318 directs (e.g., transmits) the third color supplemental light (e.g., green supplemental light) emitted by the second light source 312 to the second spatial light modulator 342 and directs (e.g., reflects) the third color light of the first light emitted by the light splitting element 313 to the second spatial light modulator 342, so that the second spatial light modulator 342 modulates the third color light according to the image data of the third color to generate the projection light and the non-projection light of the third color. It can be understood that the second spatial light modulator 342 can modulate the third color light according to the third color image data to generate the projection light and the non-projection light of the third color, and as described in the first embodiment, when the first light source 311 emits the third color light of the first light and when the second light source 312 emits the complementary light of the third color are determined by the result of the color gamut determining module 350 determining the color gamut range of the subframe image data of the third color, and detailed descriptions thereof are omitted here.
In this embodiment, the light splitting module 361 is a polarization light splitting module (e.g., a polarization beam splitter), the light splitting module 361 provides the light with the first polarization state (e.g., S-polarized light) emitted from the light modulation module 340 to the projection lens 370 as the projection light, and the light splitting module 361 further provides the light with the second polarization state (e.g., P-polarized light) emitted from the light modulation module 340 to the light path module 262 as the non-projection light. The optical path module 362 guides the non-projection light to the light splitting element 313, and the light splitting element 313 receives the non-projection light and the first light. In this embodiment, the light splitting module 361 includes four sides connected end to end, the first spatial light modulator 341 and the second spatial light modulator 342 are respectively disposed on two adjacent sides of the light splitting module 361, the projection light is emitted from a side opposite to the second spatial light modulator 342, and the non-projection light is emitted from a side opposite to the first spatial light modulator 341.
The non-projection light emitted from the light splitting module 361 has a second polarization state, or the light path module 362 includes a polarization element, and the non-projection light (e.g., the non-projection light of the first polarization state) emitted from the light splitting module 361 is converted into light having the second polarization state by the polarization element and is guided to the light source device 310 by the light path module 362 for reuse. Specifically, in this embodiment, the non-projection light (for example, the non-projection light of the first polarization state) emitted from the light splitting module 361 is guided by the light path module 362 to the light splitting element 313 of the light source device 310 to be split and used again by the non-projection light of the second polarization state emitted from the light splitting module 361. It is understood that, in this embodiment, the optical path module 362 includes a plurality of guiding elements 363 (e.g., reflecting elements), and the plurality of guiding elements 363 guide the non-projection light to the light processing elements 316 and 317 of the light source device 310, and the non-projection light reaches the light splitting element 313 after passing through the light processing elements 316 and 317 to be split and utilized again. A light processing element 319c (e.g., a dodging element: fly eye lens) may be disposed between the second light source 312 and the light combining element 318.
Still further, in an embodiment, the light combining element 318 may include a first region and a second region, one of the first region and the second region is a light transmitting region, one of the first region and the second region is a light reflecting region, the first region guides (e.g., transmits) the complementary light of the third color (e.g., green complementary light) to the second spatial light modulator 342, and the second region guides (e.g., reflects) the first light of the third color to the second spatial light modulator 342.
In another embodiment, the light combining element 318 is a polarization light combining element, and the light combining element 318 is used for transmitting one of the light with the first polarization state and the light with the second polarization state and reflecting the other of the light with the first polarization state and the light with the second polarization state. Further, in this embodiment, the light combining element 318 transmits the third color light with the first polarization state and reflects the third color light with the second polarization state, the second light source 312 emits the supplementary light with the third color, the supplementary light with the third color with the first polarization state is guided (e.g., transmitted) to the second spatial light modulator 342 by the light combining element 318, and the third color light with the second polarization state emitted by the light splitting element 313 is guided (e.g., reflected) to the second spatial light modulator 342 by the light combining element 318. It is understood that, in this embodiment, the second light source 312 may include a laser and a polarization element, and light emitted from the laser is converted into supplementary light of a third color with the first polarization state by the polarization element and is guided to the light combining element 318.
Compared with the first embodiment, the light modulation module 340 of the present embodiment includes two spatial light modulators, and the two spatial light modulators can modulate the first color light and then modulate the second and third color lights simultaneously through the light splitting processing of the light splitting element 313, so as to effectively increase the image modulation speed.
It is to be understood that, in the modified embodiment of the second embodiment, the optical paths of the second color light and the third color light may be interchanged, that is, the light splitting element 313 is further configured to direct a third color light (e.g., green light) in the converted light of the first light to any one of the first spatial light modulator 341 and the second spatial light modulator 342 for a second time period different from the first time period (e.g., the second time period may be adjacent to but not overlapping with the first time period) so that the any one spatial light modulator modulates the third color light according to the image data of the third color to generate the projected light and the non-projected light of the third color. In this embodiment, the light splitting element 313 guides (e.g., reflects) the third color light (e.g., green light) in the converted light of the first light to the guiding element 319b (e.g., a reflecting element), and the guiding element 319b guides the second color light to the first spatial light modulator 341 so that the first spatial light modulator 341 modulates the third color light according to the image data of the third color to generate the projection light and the non-projection light of the third color.
Further, while the light splitting element 313 also directs (e.g., transmits) the second color light (e.g., red light) in the converted light of the first light to the first spatial light modulator 341 in the second time period, the light splitting element 313 also directs (e.g., transmits) the second color light (e.g., red complementary light) in the converted light of the first light to the light combining element 318, the light combining element 318 directs (e.g., transmits) the complementary light (e.g., red complementary light) of the second color emitted by the second light source 312 to the second spatial light modulator 342, and the second color light with the second polarization state emitted by the light splitting element 313 is directed (e.g., reflected) to the second spatial light modulator 342 by the light combining element 318, so that the second spatial light modulator 342 modulates the second color light according to the image data of the second color to generate the projection light and the non-projection light of the second color. It is to be understood that the second spatial light modulator 342 can modulate the second color light according to the second color image data to generate the projected light and the non-projected light of the second color.
Specifically, in an example of the modified embodiment of the second embodiment, the light combining element 318 may include a first region and a second region, one of the first region and the second region is a light transmitting region, one of the first region and the second region is a light reflecting region, the first region guides (e.g., transmits) the complementary light of the second color to the second spatial light modulator 342, and the second region guides (e.g., reflects) the first light of the second color to the second spatial light modulator 342.
In another embodiment, the light combining element 318 is a polarization light combining element, and the light combining element 318 is used for transmitting one of the second color light with the first polarization state and the second color light with the second polarization state and reflecting the other one of the second color light with the first polarization state and the second color light with the second polarization state. Further, the light combining element 318 can transmit the second color light with the first polarization state and reflect the second color light with the second polarization state, the second light source 312 emits the supplementary light with the second color, the supplementary light with the second color with the first polarization state is guided (e.g., transmitted) to the second spatial light modulator 342 by the light combining element, and the second color light with the second polarization state emitted by the light splitting element 313 is guided (e.g., reflected) to the second spatial light modulator 342 by the light combining element 318. It is understood that, in this embodiment, the second light source 312 may include a laser and a polarization element, and light emitted from the laser is converted into supplementary light of the second color with the first polarization state by the polarization element and is guided to the light combining element 318.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a projection system 400 according to a fourth embodiment of the invention. The projection system 400 has a similar structure to the projection system 300 of the third embodiment, that is, the description of the projection system 300 of the third embodiment can be basically applied to the projection system 400, and the main difference is that: the positions of the light processing elements 416 and 417 in the light source device of the projection system 400 and the optical path of the non-projection light recovered by the light recovery module 460 are different from those of the third embodiment, and the projection system 400 further includes a polarization beam splitter 481 disposed between the first spatial light modulator 441 and the light splitting module 461 (such as a polarization beam splitter) and a light processing element 419a (such as a collecting lens) disposed between the light combining element 418 and the second spatial light modulator 442.
Specifically, in the projection system 400 of the fourth embodiment, the light splitting element 413 is a dichroic sheet, and during the first time period, the light splitting element 413 reflects the first color light (blue excitation light) in the first light, and the guiding element 419b (such as a reflecting element) guides the first color light to the first spatial light modulator 441(LCOS or LCD spatial light modulator). The first spatial light modulator 441 receives the first color light guided by the guiding element 419b modulated by the image data, and emits the non-projection light of the first color with the first polarization state that is not used for projection display and the projection light of the first color with the second polarization state that is used for projection display, the non-projection light of the first color with the first polarization state and the projection light of the first color with the second polarization state that is used for projection display are guided to the polarization splitting sheet 481, and the polarization splitting sheet 481 guides (e.g., reflects) the non-projection light of the first color with the first polarization state out of the light splitting module 461 and guides (e.g., transmits) the projection light of the first color with the second polarization state to the light splitting module 461. The light splitting module 461 guides the projection light of the first color with the second polarization state to the projection lens 470.
Further, in the first time period, the second light source 412 may emit a complementary light (e.g., a red complementary light) of a second color, the complementary light of the second color is homogenized by the light processing element 419c (e.g., a light homogenizing element: fly eye lens), then transmitted by the light combining element 418, collected by the light processing element 419a, and reaches the second spatial light modulator 442, the second spatial light modulator 442 may modulate the complementary light of the second color according to the image data of the second color gamut F2, and the second spatial light modulator 442 emits a second color light with the first polarization state for projection display and a second color light with the second polarization state for non-projection display to the light splitting module 461. The light splitting module 461 guides the second color light with the first polarization state to the projection lens 470 and guides the second color light with the second polarization state to the light path module 462, and the light path module 462 may include a plurality of guiding elements 463, 464, 465 (e.g., reflective elements), and the plurality of guiding elements 463, 464, 465 guide the second color light with the second polarization state to the light source device. Specifically, unlike the third embodiment, the plurality of guiding elements 463, 464 and 465 guide the non-projection light of the second color having the second polarization state to the light combining element 418 (in the third embodiment, the non-projection light is guided to the light splitting element 313), so that the light combining element 418 combines the non-projection light and the complementary light and provides the combined light to the second spatial light modulator 442 for reuse.
In the second time period, the first light source 441 emits yellow converted light of the first light, the yellow converted light is split by the light splitting element 413 (e.g., a dichroic film), the second color light (e.g., red light) of the first light is guided (e.g., transmitted) by the light splitting element 413 to the light combining element 418, and the light combining element 418 further guides (e.g., reflects) the second color light of the first light to the second spatial light modulator 442, so that the second spatial light modulator 442 modulates the second color light of the first light according to the image data of the second color to generate projected light and non-projected light of the second color, wherein the projected light of the second color can be guided to the projection lens 470 by the light splitting module 461 for projection display. Further, at the same time, the third color light (e.g. green light) in the first light is guided (reflected) by the light splitting element 413 to the guiding element 419b and further reaches the first spatial light modulator 441 through the guiding element 419b, so that the first spatial light modulator 441 can modulate the third color light in the first light according to the image data of the third color to generate the projection light and the non-projection light of the third color, wherein the projection light of the third color can be guided to the projection lens 470 by the light splitting module 461 for projection display.
Specifically, the light combining element 418 has a plurality of guiding manners for the second color light of the first light and the second color light of the supplementary light. Two examples are mainly described in detail below.
In one embodiment, the light combining element 418 may include a first region and a second region, the first region reflects a second color light of the first light, the second region transmits a supplementary light of the second color, and the light combining element 418 is periodically rotated, so that the first region is located on the optical path of the supplementary light of the second color emitted by the second light source 412 for the first period of time, and the second area is located on the light path where the second color light in the first light emitted by the first light source via the light splitting element 413 is located in the second time period, such that the light combining element 418 can sequentially provide the second color light of the first light and the second color light of the supplemental light to the second spatial light modulator 442 in time, such that the second spatial light modulator 442 modulates the second color light of the first light and the second color light of the supplemental light in time-sharing (i.e., sequentially) according to image data.
In another embodiment, the light combining element 418 is a polarization light combining element, and the polarization states of the second color light of the first light and the second color light of the supplementary light are orthogonal, for example, if the second color light of the first light is the light with the first polarization state or the second color light of the first light is converted into the second color light with the first polarization state by a polarization element (e.g., a polarization conversion element disposed between the light splitting element 413 and the light combining element 418), the second color light with the first polarization state is guided (e.g., reflected) by the light combining element 418 to the second spatial light modulator 442; the second color light in the supplemental light is light with the second polarization state, that is, the second light source 412 directly emits the second color light with the second polarization state or the second light source 412 includes a laser and a polarization element, the second color light emitted by the laser is converted into the second color light with the second polarization state as the supplemental light by the polarization element, and the supplemental light with the second color with the second polarization state is guided (e.g., transmitted) by the light combining element 418 to the second spatial light modulator 442. The second spatial light modulator 442 modulates the second color light with the first polarization state and the supplemental light with the second polarization state according to image data, and correspondingly emits the projection light with the second color with the first polarization state for projection display and the non-projection light with the second color with the second polarization state for non-projection display to the light splitting module 461. The light splitting module 461 guides the second color light with the first polarization state to the projection lens 470, and guides the second color light with the second polarization state to the light path module 462, the light path module 462 may include a plurality of guiding elements 463, 464, 465 (such as reflecting elements), and the plurality of guiding elements 463, 464, 465 guide the second color light with the second polarization state to the light splitting element 413 or the light combining element 418 of the light source device (the light combining element 418 is taken as an example in this embodiment). The light combining element 418 can sequentially provide the second color light of the first light and the second color light of the complementary light to the second spatial light modulator 442 in time, so that the second spatial light modulator 442 modulates the second color light of the first light and the second color light of the complementary light according to image data in a time-sharing (i.e., sequential) manner; however, in an alternative embodiment, the light combining element 418 may provide the second color light of the first light and the second color light of the complementary light to the second spatial light modulator 442 at the same time, so that the second spatial light modulator 442 modulates the second color light of the first light and the second color light of the complementary light according to image data at the same time.
Furthermore, since the etendue of the laser light is small, the laser light is easier to recover than the fluorescence light, the power of the laser light can be saved by recovering the laser light, and the color gamut of the image that can be modulated by the mixed light of the fluorescence light and the laser light is smaller than the color gamut that can be modulated by the pure laser light, in this embodiment, the laser light can be recovered as much as possible while the fluorescence light is recovered as little as possible. To achieve the above object, specifically, as shown in fig. 8, one or more guiding elements 463, 464, 465 (e.g. reflecting elements: mirrors) in the optical path module 462 mainly guide the non-projected light by reflection, the non-projected light includes a non-projected light formed by a corresponding color light of the first light and a non-projected light formed by a corresponding color light of the complementary light, a size of a main light spot formed by the non-projected light of the first light at a predetermined position is generally much larger than a size of a main light spot formed by the non-projected light of the complementary light at the predetermined position, the guiding elements 463, 464, 465 may be arranged at the predetermined position, and a size of an actual reflection surface of the guiding element at the predetermined position is smaller than a size of the main light spot formed by the non-projected light of the first light at the predetermined position and is substantially equal to the guiding element 463, 464. 465, at the predetermined position, whereby recycling of light of a corresponding color in the first light can be further reduced, mainly for efficient supplementary light.
Further, in an embodiment, when the corresponding color light of the first light and the supplemental light are time-divided and provided to the second spatial light modulator 442, the light path module 462 may be turned off when the light dividing module 461 emits the non-projected light formed by the first light, that is, the light recycling module 460 suspends recycling the non-projected light; when the light splitting module emits the non-projection light formed by the supplement light, the light path module 462 is turned on, and the light recycling module 260 recycles the non-projection light formed based on the supplement light.
As shown in fig. 8: the non-projection light a of the second color of the first light and the non-projection light C of the supplement light of the second color are emitted from the light splitting module 461, and the beam area of the non-projection light a of the second color of the first light is larger than the beam area of the non-projection light C of the supplement light of the second color. The size of the directing element 463 is only suitable for fully receiving the non-projected light C of the supplemental light of the second color.
Further, in a modified embodiment of the fourth embodiment, the optical paths of the second color light and the third color light may be interchanged, and further, during the first time period, the second light source 412 may emit supplementary light of a third color (e.g., green supplementary light), the complementary light of the third color is homogenized by the light processing element 419c (such as a light homogenizing element: fly eye lens), transmitted by the light combining element 418, collected by the light processing element 419a (such as a collecting lens), and then reaches the second spatial light modulator 442, the second spatial light modulator 442 may modulate the supplementary light of the third color according to the image data of the third color of the second color gamut F2, the second spatial light modulator 442 emits a third color light with the first polarization state for projection display and a third color light with the second polarization state for non-projection display to the light splitting module 461. The light splitting module 461 guides the third color light with the first polarization state to the projection lens 470 and guides the third color light with the second polarization state to the light path module 462, and the light path module 462 may include a plurality of guiding elements 463, 464, 465 (e.g., reflective elements), and the plurality of guiding elements 463, 464, 465 guide the third color light with the second polarization state to the light source device. Specifically, unlike the third embodiment, the plurality of guiding elements 463, 464 and 465 guide the non-projection light of the third color having the second polarization state to the light combining element 418 (in the third embodiment, the non-projection light is guided to the light splitting element 313), so that the light combining element 418 combines the non-projection light and the complementary light and provides the combined light to the second spatial light modulator 442 for reuse.
In the second time period, the first light source 411 emits yellow converted light of the first light, the yellow converted light is split by the light splitting element 413 (e.g., a dichroic film), the third color light (e.g., green light) of the first light is guided (e.g., transmitted) by the light splitting element 413 to the light combining element 418, and the light combining element 418 further guides (e.g., reflects) the third color light of the first light to the second spatial light modulator 442, so that the second spatial light modulator 442 modulates the third color light of the first light according to the image data of the third color to generate projected light and non-projected light of the third color, wherein the projected light of the third color can be guided to the projection lens by the light splitting module 461 for projection display. Further, at the same time, the light of the second color (e.g., red light) in the first light is guided (reflected) by the light splitting element to the guiding element 419b, and then reaches the first spatial light modulator 441 through the guiding element 419b, so that the first spatial light modulator 441 can modulate the light of the second color in the first light according to the image data of the second color to generate the projection light and the non-projection light of the second color, wherein the projection light of the second color can be guided by the polarization light splitting module to the projection lens 480 for projection display.
Specifically, the light combining element 418 has a plurality of guiding manners for the third color light of the first light and the third color light of the supplementary light. Two examples are mainly described in detail below.
In one embodiment, the light combining element 418 may include a first region and a second region, the first region reflects a third color of light of the first light, the second region transmits supplemental light of the third color, and the light combining element 418 is periodically rotated, so that the first region is located on the optical path of the supplementary light of the third color emitted by the second light source 412 for the first period of time, and the second area is located on the light path where the third color light in the first light emitted by the first light source via the light splitting element 413 is located in the second time period, such that the light combining element 418 can sequentially provide the third color light of the first light and the third color light of the supplemental light to the second spatial light modulator 442 in time, such that the second spatial light modulator 442 modulates the third color light of the first light and the second color light of the supplementary light in time-sharing (i.e., sequential) manner according to image data.
In another embodiment, the light combining element 418 is a polarization light combining element, and the polarization states of the third color light in the first light and the third color light in the supplementary light are orthogonal, for example, if the third color light in the first light is the light with the first polarization state or the third color light in the first light is converted into the third color light with the first polarization state by a polarization element (e.g., a polarization conversion element disposed between the light splitting element and the light combining element), the third color light with the first polarization state is guided (e.g., reflected) by the light combining element 418 to the second spatial light modulator 442; the third color light in the supplemental light is light with the second polarization state, that is, the second light source 412 directly emits the third color light with the second polarization state, or the second light source 412 includes a laser and a polarization element, the third color light emitted by the laser is converted into the third color light with the second polarization state as the supplemental light by the polarization element, and the supplemental light with the third color with the second polarization state is guided (e.g., transmitted) to the second spatial light modulator 442 by the light combining element 418. The second spatial light modulator 442 modulates the third color light with the first polarization state and the supplementary light with the second polarization state according to the image data, and correspondingly emits the projection light with the third color with the first polarization state for projection display and the non-projection light with the second color with the second polarization state for non-projection display to the light splitting module 461. The light splitting module 461 guides the third color light with the first polarization state to the projection lens 470, and guides the third color light with the second polarization state to the light path module 462, the light path module may include a plurality of guiding elements 463, 464, 465 (such as reflecting elements), and the plurality of guiding elements 463, 464, 465 guide the third color light with the second polarization state to the light splitting element 413 or the light combining element 418 of the light source device (the light combining element 418 is taken as an example in this embodiment). The light combining element 418 can sequentially provide the third color light of the first light and the third color light of the complementary light to the second spatial light modulator 442 in time, so that the second spatial light modulator 442 modulates the third color light of the first light and the third color light of the complementary light according to image data in a time-sharing (i.e., sequential) manner; however, in an alternative embodiment, the light combining element 418 may provide the third color light of the first light and the second color light of the complementary light to the second spatial light modulator 442 at the same time, so that the second spatial light modulator 442 modulates the third color light of the first light and the third color light of the complementary light according to image data at the same time.
Further, as shown in fig. 8: the non-projection light a of the third color of the first light and the non-projection light C of the supplement light of the third color are emitted from the light splitting module 461, and the beam area of the non-projection light a of the third color of the first light is larger than the beam area of the non-projection light C of the supplement light of the third color. The size of the guiding element is only suitable for completely receiving the non-projected light C of the supplementary light of the second color.
Referring to fig. 9, fig. 9 is a schematic view of a projection system 500 according to a fifth embodiment of the invention. The projection system 500 is substantially the same as the projection system 400 of the fourth embodiment, and the main difference is that: the light recycling module of the projection system 500 includes a first recycling module 560 and a second recycling module 580. The first recycling module 560 is the same as the light recycling module 460 of the fourth embodiment. The second light recycling module 580 is disposed adjacent to the first spatial light modulator 541, the second light recycling module 580 includes a polarization beam splitter 581 and a guiding element 582, the polarization beam splitter 581 is the same as the polarization beam splitter 481 of the fourth embodiment, and the guiding element 582 receives the non-projected light with the second polarization state emitted from the polarization beam splitter 581 and guides the non-projected light with the second polarization state to the light source device (e.g., the light splitting element 513) for further utilization by the first spatial light modulator 541. In this embodiment, the non-projection light emitted from the first spatial light modulator 541 can be further recycled, and the light utilization efficiency of the projection system 500 is further improved.
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 (21)

1. A projection system, characterized by: the projection system includes:
the light source device comprises
A first light source for emitting a first light for modulating an image in a first color gamut range; and
a second light source for emitting complementary light that widens a color gamut of light of at least one color of the first light emitted by the first light source, the complementary light being for modulating an image in a second color gamut range in cooperation with the first light;
the light modulation module is used for carrying out image modulation on the light emitted by the light source device according to the image data so as to generate non-projection light and projection light required by an image to be displayed;
a projection lens for receiving the projection light to project an image; and
the light recycling module is used for recycling the non-projection light to the light modulation module for reuse;
the light recycling module comprises a light splitting module and a light path module, wherein the light splitting module is used for receiving the projection light and the non-projection light emitted by the light modulation module, guiding the projection light to the projection lens and guiding the non-projection light to the light source device through the light path module, so that the light source device guides the non-projection light to the light modulation module for reuse; and
the light splitting module is a polarization light splitting module, the polarization light splitting module provides the light with the first polarization state emitted by the light modulation module to the projection lens as the projection light, and the polarization light splitting module further provides the light with the second polarization state emitted by the light modulation module to the light path module as the non-projection light.
2. The projection system of claim 1, wherein: the projection system further includes: the color gamut judging module is used for receiving the image data, judging the color gamut range of the image to be displayed according to the image data and outputting a control signal according to the color gamut range;
and the light source controller is used for receiving the control signal and controlling the first light emitted by the first light source and the second light emitted by the second light source according to the control signal, so that the color gamut range of the light emitted by the first light source and the light emitted by the second light source can be modulated to meet the color gamut range of the image to be displayed.
3. The projection system of claim 2, wherein: the first light source comprises a light-emitting element and a color wheel, the color wheel comprises at least two segment areas, the light-emitting element emits exciting light, the at least two segment areas receive the exciting light and correspondingly emit first light, the first light comprises at least two colors of light, and the supplementary light comprises laser light;
if the color gamut judging module judges that the color gamut range of the image to be displayed is within a first color gamut range, the first color gamut range is the color gamut range which can be displayed by the light of the at least two colors, the color gamut judging module outputs a control signal to the light source controller to control the first light source to be turned on, and the light modulation module modulates the first light according to the image data to generate projection light;
if the color gamut judging module judges that at least part of the color gamut range of the image to be displayed is in a second color gamut range, the second color gamut range is the color gamut range outside the first color gamut range, the second color gamut range is in the color gamut range which can be displayed by the supplement light and the first light together, the color gamut judging module outputs a control signal to the light source controller to control the first light source and the second light source to be opened, and the light modulation module modulates the supplement light according to the image data to generate the projection light.
4. The projection system of claim 1, wherein: the first gamut range is a DCI gamut range and the second gamut range is a portion of the REC gamut range excluding the DCI gamut range.
5. The projection system of claim 1, wherein: the light source device further includes a first light combining element, the excitation light emitted by the first light source is converted into the first light by a color wheel and is guided to the first light combining element, the supplement light emitted by the second light source is also guided to the first light combining element, the light path module also guides the non-projection light to the first light combining element, and the first light, the supplement light and the non-projection light emitted by the first light combining element are guided to the light modulation module.
6. The projection system of claim 5, wherein: the first light combining element comprises a first area and a second area, one of the first area and the second area is a light transmission area, the other of the first area and the second area is a light reflection area, the first area guides the supplement light and the non-projection light to the light modulation module, and the second area guides the first light to the light modulation module.
7. The projection system of claim 5, wherein: the first light combining element is a polarization light combining element, the first light combining element guides both first light with a first polarization state and supplementary light with the first polarization state to the light modulation module, the first light combining element also guides non-projection light with a second polarization state to the light modulation module, and the light modulation module is an LCD spatial light modulation module or an LCOS spatial light modulation module.
8. The projection system of claim 5, wherein: the light path module includes a guiding element and a second light combining element, the guiding element is used for receiving the non-projection light emitted by the light splitting module and guiding the non-projection light to the second light combining element, the supplementary light emitted by the second light source is also guided to the second light combining element, and the second light combining element guides the non-projection light and the supplementary light to the first light combining element.
9. The projection system of claim 8, wherein: the second light combining element is a polarization light combining element, and is configured to transmit one of the light with the first polarization state and the light with the second polarization state and reflect the other of the light with the first polarization state and the light with the second polarization state, and the second light combining element guides the supplementary light with the first polarization state emitted by the second light source to the first light combining element, and the second light combining element guides the non-projection light with the second polarization state to the first light combining element.
10. The projection system of claim 1, wherein: the light modulation module comprises a first spatial light modulator and a second spatial light modulator, the light source device further comprises a light splitting element and a light combining element, the light splitting element receives the first light and guides the first color light in the first light to the first spatial light modulator so that the first spatial light modulator modulates the first color light according to image data to generate projection light and non-projection light of a first color, the light splitting element guides the second color light in the first light to the light combining element, the second light source emits supplemental light of a second color to be provided to the light combining element, the second color light emitted by the light combining element is guided to the second spatial light modulator so that the second spatial light modulator modulates the second color light according to image data to generate projection light and non-projection light of a second color, the light splitting element is further configured to direct third color light of the first light to any one of the first spatial light modulator and the second spatial light modulator, so that the any one spatial light modulator modulates the third color light according to image data to generate projected light and non-projected light of a third color.
11. The projection system of claim 10, wherein: the polarization beam splitting module provides the light with the first polarization state emitted by the first spatial light modulator and the second spatial light modulator to the projection lens as the projection light, and the polarization beam splitting module also provides the light with the second polarization state emitted by the first spatial light modulator and the second spatial light modulator to the light path module as the non-projection light.
12. The projection system of claim 11, wherein: the polarization beam splitting module is a polarization beam splitter, and the first spatial light modulator and the second spatial light modulator are LCD spatial light modulation modules or LCOS spatial light modulation modules.
13. The projection system of claim 11, wherein: the projection system further comprises a polarization beam splitter, the polarization beam splitter is arranged between the first spatial light modulator and the polarization beam splitting module, the polarization beam splitter guides non-projection light with first color in a first polarization state to the outside of the polarization beam splitting module and guides projection light with first color in a second polarization state to the polarization beam splitting module, and the polarization beam splitting module guides the projection light with the first color in the second polarization state to the projection lens.
14. The projection system of claim 10, wherein: the optical path module guides the non-projected light to the light splitting element, and the light splitting element receives the non-projected light and the first light.
15. The projection system of claim 14, wherein: the non-projection light has a second polarization state, or the light path module comprises a polarization element, and the non-projection light is converted into light with the second polarization state by the polarization element and guided to the light splitting element by the light path module.
16. The projection system of claim 10, wherein: the light combining element includes a first region and a second region, one of the first region and the second region is a light transmitting region, one of the first region and the second region is a light reflecting region, the first region guides the supplementary light of the second color to the second spatial light modulator, and the second region guides the first light of the second color to the second spatial light modulator.
17. The projection system of claim 10, wherein: the light combining element is a polarization light combining element, and is used for transmitting one of the second color light with the first polarization state and the second color light with the second polarization state and reflecting the other one of the second color light with the first polarization state and the second color light with the second polarization state.
18. The projection system of claim 17, wherein: the light path module guides the non-projection light to the light combining element, and the light combining element guides the non-projection light and the supplementary light emitted by the second light source to the second spatial light modulator.
19. The projection system of claim 1, wherein: the light path module comprises a guiding element, the guiding element is used for guiding the non-projection light, the non-projection light comprises non-projection light formed based on the first light and non-projection light formed based on the supplement light, the size of a main light spot formed by the non-projection light formed by the first light in a preset position is larger than that of a main light spot formed by the non-projection light formed by the supplement light in the preset position, the guiding device is arranged in the preset position, and the size of a reflecting surface of the guiding device in the preset position is smaller than that of the main light spot formed by the non-projection light formed by the first light in the preset position.
20. The projection system of claim 19, wherein: the size of the reflecting surface of the reflecting device at the preset position is equal to the size of a main light spot formed by the non-projection light formed by the supplement light at the preset position.
21. The projection system of claim 1 or 20, wherein: when the light splitting module emits non-projection light formed by the first light, the light path module is closed, and the light recycling module suspends recycling of the non-projection light; when the light splitting module emits the non-projection light formed by the supplement light, the light path module is started, and the light recovery module recovers the non-projection light formed by the supplement light.
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