CN108279548B

CN108279548B - Projection system

Info

Publication number: CN108279548B
Application number: CN201710010618.XA
Authority: CN
Inventors: 胡飞; 郭祖强; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2017-01-06
Filing date: 2017-01-06
Publication date: 2021-02-02
Anticipated expiration: 2037-01-06
Also published as: WO2018126561A1; CN108279548A

Abstract

A projection system comprises a first light source, a second light source, a color gamut judging module, a light source controller and a light modulation device. The first light source is used for emitting primary light for modulating an image, the primary light can be used for modulating an image in a first color gamut range, and the second light source is used for emitting supplementary light for widening the color gamut of at least one light of the primary light emitted by the first light source; the color gamut judging module is used for receiving image data, judging the color gamut range of an image to be displayed according to the image data and outputting a control signal according to the color gamut range; the color gamut control module is used for receiving the control signal and controlling the first light source and the second light source to be turned on and off according to the control signal, so that the color gamut range of the light emitted by the first light source and the second light source, which can be modulated, meets the color gamut range of the image to be displayed; the light modulation device is used for carrying out image modulation on the primary light and the supplementary light so as to generate projection light required by an image to be displayed.

Description

Projection system

Technical Field

The invention relates to the technical field of projection, in particular to a projection system.

Background

Conventional projection systems are widely used in the fields of cinema, education, television, and the like, and the projection systems may be classified into dmd (digital micro device), lcos (liquid Crystal on silicon), lcd (liquid Crystal display), and the like according to the types of light modulation devices used in the projection systems, and may be classified into single-chip, two-chip, and three-chip systems according to the number of light modulation devices. 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:

a first light source for emitting primary light for modulating an image, the primary light being operable to modulate an image in a first color gamut range;

a second light source for emitting supplementary light for widening a color gamut of at least one of primary lights emitted by the first light source, the primary light emitted by the first light source and the supplementary light emitting an image capable of being used for modulating within a second color gamut in a preset ratio;

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;

the light source controller is used for receiving the control signal and controlling the first light source and the second light source to be turned on and off according to the control signal, so that the color gamut range of the light emitted by the first light source and the second light source, which can be modulated, meets the color gamut range of the image to be displayed; and

and the light modulation device is used for carrying out image modulation on the primary light and the supplementary light so as to generate projection light required by an image to be displayed.

Compared with the prior art, in the projection system, the second light source can emit supplementary light to widen the color gamut of the projection system, the color gamut judging module judges the color gamut range of the image to be displayed according to the image data, and outputs a control signal to control the first light source and the second light source to be turned on or off according to the color gamut range, the light modulation device image-modulates the at least two colors of light and the supplemental light to generate projection light required for a projection image, since the second light source is capable of emitting supplementary light that widens the color gamut of the projection system, the light modulation device modulates the supplementary light to generate projection light so that the color gamut of the projected image is effectively widened, therefore, the color distortion phenomenon of the picture is improved, and the projection system has wider color gamut range, vivid picture color and better display effect.

Drawings

Fig. 1 is a block schematic diagram of a projection system according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a light-emitting device according to an embodiment of the projection system shown in fig. 1.

FIG. 3 is a schematic diagram of a light-emitting device of another embodiment of the projection system shown in FIG. 1.

Fig. 4 is a schematic structural diagram of the color wheel shown in fig. 1.

Fig. 5 is a schematic diagram of the gamut range of the projection system shown in fig. 1.

FIG. 6 is a timing diagram illustrating driving of the light emitting device and the spatial light modulator of the projection system shown in FIG. 1.

Fig. 7 is a block schematic diagram of a projection system according to a second embodiment of the present invention.

Fig. 8 is a schematic view of a color wheel structure of a projection system according to a second embodiment of the present invention.

Fig. 9, 10 and 11 are schematic diagrams illustrating driving timing sequences of a light source and a spatial light modulator of a projection system according to a second embodiment of the invention.

Fig. 12 is a structural diagram of a color wheel according to a modified embodiment of the second embodiment of the present invention.

Description of the main elements

Projection system

100, 200

Light emitting device 110

Light source controllers

150, 250

Light modulation device 160

Spatial light modulators

261, 262

Color

gamut determination modules

170, 270

Projection lens 180

Light processing component 190

First light source

120, 220

Second light source

130, 230

Color wheel

140, 240

Segment regions

141, 241

Non-spoke

regions

141a, 241a

Spoke regions

142, 242

Partial spoke

regions

141b, 241b

First gamut F1

Second gamut F2

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

First embodiment

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 emitting device 110, a light source controller 150, a light processing element 190, a light modulation device 160, a color gamut determination module 170, and a projection lens 180. The light emitting device 110 includes a first light source 120, a second light source 130 and a color wheel 140.

The first light source 120 is configured to emit primary light, the primary light is configured to modulate an image, and the primary light can be configured to modulate the image in a first color gamut range. The color wheel 140 is located on a light path of the primary light emitted by the first light source 120, and the color wheel 140 includes at least two segment regions, where the at least two segment regions receive the primary light and correspondingly emit converted light, where the converted light includes at least two colors of light. The second light source 130 is configured to emit complementary light that widens the color gamut of at least one of the primary lights emitted by the first light source 120, and the primary light emitted by the first light source 120 and the complementary light are emitted in a predetermined ratio to be able to modulate an image in a second color gamut range. The color gamut determining module 170 is configured to receive image data, determine a color gamut range of an image to be displayed according to the image data, and output a control signal according to the color gamut range. The light source controller 150 is configured to receive the control signal and control the first light source 120 and the second light source 130 to be turned on and off according to the control signal, so that a color gamut range in which light emitted by the first light source 120 and the second light source 130 can be modulated meets a color gamut range of the image to be displayed. The light processing element 190 may include a collecting lens system, a relay lens system, and the like, and the light processing element homogenizes and/or changes the light path of the at least two color lights emitted by the light emitting device and the supplementary light, and collects, diffuses, shapes, and the like the at least two color lights and the supplementary light so that the at least two color lights and the supplementary light are irradiated onto the light modulating device 160 according to a preset spot size. The light modulation device 160 is configured to perform image modulation on the at least two color lights and the supplemental light respectively according to the image data to generate projection light required for a projection image. It is understood that in a modified embodiment, the first light source 120 may directly emit primary colors of at least two colors, and thus the color wheel 140 may be omitted.

The first light source 120 is an excitation light source, and emits primary light under the control of the light source controller 150. The first light source 120 may be disposed at one side of the color wheel 140. The first light source 120 may be a blue light source emitting blue primary color light, but it is understood that the first light source 120 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 first light source 120 includes a blue laser for emitting blue laser as the primary light, and it is understood that the first light source 120 may include one, two or more blue lasers, and the number of the lasers may be selected according to actual needs.

The second light source 130 is a supplementary light source, which emits supplementary light under the control of the light source controller 150. As shown in fig. 2, in an embodiment, the second light source 130 may be disposed on a side of the color wheel 140 where the first light source 120 is located, that is, the first light source 120 and the second light source 130 are located on a same side of the color wheel 140, the color wheel 140 is a transmissive color wheel, and the light emitted by the first light source 120 and the light emitted by the second light source 130 are emitted to the light modulation device 160 after passing through the color wheel 140. As shown in fig. 3, in another embodiment, the second light source 130 may be disposed on the opposite side of the color wheel 140 from the first light source 120, that is, the first light source 120 and the second light source 130 are located on different sides of the color wheel 140, the color wheel 140 is also a transmissive color wheel, the light emitted by the first light source 120 is provided to the light modulation device 160 after passing through the color wheel 140, and the light emitted by the second light source 130 is also provided to the light modulation device 160 but not through the color wheel 140.

The second light source 130 may include at least one laser for emitting laser light of at least one color as the supplement light. As shown in fig. 2 and 3, the second light source 130 may include a first laser 131 and a second laser 132 respectively emitting 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 130 may include only one laser and emit only one color of supplementary light; alternatively, the second light source 130 may include three lasers, which emit light supplement 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 130 may be determined according to the color gamut to be widened, for example, the color gamut to be widened is widened, the second light source 130 may include a red laser emitting a red complementary light, for example, the color gamut to be widened is widened, the second light source 130 may include a green laser emitting a green complementary light, for example, the color gamut to be widened and the color gamut to be widened is widened, the second light source 130 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 first light source 120 is a blue laser, and the first laser 131 and the second laser 132 may be a red laser and a green laser, respectively. The number of the first laser 131 and the second laser 132 may also be one, two or more, and may be specifically selected according to actual needs.

Referring to fig. 4, fig. 4 is a schematic structural diagram of the color wheel 140 shown in fig. 1. At least two segment regions 141 of the color wheel 140 are disposed along a circumferential direction, and the color wheel 140 can rotate along a center of the color wheel 140, such that the at least two segment regions 141 are periodically located on an optical path of the primary color light emitted from the first light source 120, and thus the at least two segment regions 141 periodically emit the at least two color lights. It is understood that the sizes of the at least two segment regions 141 can be set to be the same or different according to actual needs.

Further, when the light spot formed on the color wheel by the primary light irradiation spans two segment areas, the irradiated area is a spoke area, and the area outside the spoke area in the segment areas is a non-spoke area. Thus, two partial spoke regions 141b between the non-spoke regions 141a of adjacent two segment regions 141 constitute the spoke region 142.

In this embodiment, the color wheel 140 includes three segment regions 141 sequentially arranged along a circumferential direction, which are a first segment region B, a second segment region R, and a third segment region G, and each of the first segment region B, the second segment region R, and the third segment region G includes a non-spoke region 141a and a partial spoke region 141B adjacent to another segment region, so that the color wheel 140 is also correspondingly divided into three non-spoke regions 141a and three spoke regions 142 located between the non-spoke regions 141 a. The first segment region B is used for emitting a first color light, such as a blue light, and when the first light source 120 is a blue light source, a scattering material may be disposed on the first segment region B, and the light emitted by the first light source 120 may be emitted after being scattered by the first segment region B. In a modified embodiment, when the first light source 120 is an ultraviolet light source, a first wavelength conversion material may be disposed on the first segment region B, and light emitted from the first light source 120 may excite the first wavelength conversion material to generate the first color light.

The second segment region R is configured to emit 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 source 120 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 source 120 may excite the third wavelength conversion material to generate the third color light, i.e., green light.

It is to be understood that the color wheel 140 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 the optical path and the positional relationship between the first light source 120 and the second light source 130 and the color wheel may also be designed and adjusted according to actual needs, and the optical path and the positional relationship between the different types of color wheels and the first light source 120 and the second light source 130 are not described herein again.

The light modulation device 160 is located on the light path of the light emitted from the color wheel 140 and the light emitted from the second light source 130, and the light modulation device 160 further receives the image DATA and modulates the light emitted from the color wheel 140 and the light emitted from the second light source 130 according to the image DATA to generate projection light. The light modulation device 160 is a spatial light modulator, such as but not limited to a DMD light modulator. The projection lens 180 receives the projection light emitted from the light modulation device 160 to perform projection display.

The color gamut determining module 170 is also configured to receive the image DATA, determine a color gamut range of an image to be displayed corresponding to the image DATA according to the image DATA, and determine whether the color gamut range corresponding to the image DATA falls within the first color gamut range F1. As shown in fig. 5, the first color gamut F1 may be a color gamut that the at least two colors of light may exhibit, such as a DCI color gamut, specifically a color gamut DCI709, specifically, in an embodiment, the at least two colors of light may include red fluorescence and green fluorescence generated by the blue laser of the first light source 120 exciting red and green wavelength conversion materials on the color wheel 140, and blue laser of the first light source 120 transmitted, scattered, or reflected by the color wheel 140. Since the red fluorescence and the green fluorescence in the light of the at least two colors are obtained by exciting the wavelength conversion material, rather than pure color laser, the color gamut of the red light and the green light in the 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 is the blue laser emitted by the first light source 120, 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 130 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.

After the second light source 130 is disposed, the supplementary light emitted by the second light source 130 may emit light exceeding the first gamut range F1, and specifically, the supplementary light emitted by the second light source 130 may exhibit an REC gamut range, such as gamut range REC2020, which may be wider than the first gamut range F1, such as gamut range of REC 2020. A second gamut range F2 is defined, which is a REC gamut range outside the first gamut range F1 and is a gamut range that the supplemental light can exhibit.

It is to be understood that the color gamut determination module 170 may analyze the gray-scale value of each primary image DATA of the image DATA to calculate the color gamut value after mixing of each primary image DATA, thereby determining whether the color gamut value falls within the first or second color gamut range. The color gamut determination module 170 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 a gray-scale value of the primary color image DATA to determine the color gamut range of the image to be displayed.

It can be understood that the preset ratio of the primary light emitted by the first light source 120 and the complementary light emitted by the second light source 130 can be set according to actual needs, and the preset ratio can be understood as a ratio of the primary light emitted by the first light source 120 and the complementary light emitted by the second light source 130 in one color wheel period, specifically, the preset ratio can be adjusted according to a color gamut determination result of image data, and if a color gamut value of a majority of pixels in the image data falls within a second color gamut range, the ratio of the complementary light emitted by the second light source 130 can be increased.

If the color gamut determining module 170 determines that the color gamut of the image to be displayed falls within the first color gamut range F1 according to the image DATA, the color gamut determining module 170 may send a first control signal to the light source controller 150, the light source controller 150 controls the first light source 120 to turn on and controls the second light source 130 to turn off according to the first control signal, and the light modulating device 160 modulates the light sent by the color wheel 140 according to the image DATA to generate the projection light.

If the color gamut determining module 170 determines that at least a portion of the color gamut range of the image to be displayed is within the second color gamut range F according to the image DATA, the color gamut determining module 170 may send a second control signal to the light source controller 150, the light source controller 150 controls the first light source 120 and the second light source 130 to turn on according to the second control signal, and the light modulation device 160 modulates the light emitted by the color wheel 140 and the supplemental light respectively according to the image DATA to generate the projection light. It is understood that the light emitted by the color wheel 140 includes the converted light (e.g., yellow excited light) and the light without conversion (e.g., blue primary light). In this embodiment, the light source controller 150 controls the first light source 120 and the second light source 130 to be turned on in a time-sharing manner according to the second control signal, and the light modulation device 160 modulates the light emitted from the color wheel 140 and the supplemental light in a time-sharing manner according to the image data to generate the projection light.

Specifically, as shown in fig. 4 and fig. 6, the time of one rotation of the color wheel 140 is defined as a color wheel period T, in each color wheel period T, the corresponding time period of the non-spoke region 141a of each segment region 141 is a non-spoke period T1, each segment region 141 receives the light of the first light source 120 and emits the corresponding one of the color lights in the non-spoke period T1, and the time period between two adjacent non-spoke periods T1 is a spoke period T2 corresponding to the spoke region 142. Each color wheel period T may include at least two non-spoke periods T1 and at least two spoke periods T2, and in this embodiment, each color wheel period T includes three non-spoke periods T1 and three spoke periods T2, and the non-spoke periods T2 and the spoke periods T1 are alternately arranged.

The image data corresponding to each color wheel period T is one frame of image data, which typically includes three sub-frame primary image data. It is to be understood that the primary colors refer to red, green and blue, and the three-subframe primary color image data are red subframe image data, green subframe image data and blue subframe image data.

If the color gamut determining module 170 determines that the color gamut range of the image to be displayed corresponding to one of the three subframes of primary color image data falls within the first color gamut range F1, where the three subframes of primary color image data respectively correspond to the three non-spoke periods T1, the color gamut determining module 170 sends a control signal to the light source controller 150 so as to control the first light source 120 to be turned on in the corresponding non-spoke period T1 and control the second light source 130 to be turned off in the corresponding non-spoke period T1 via the light source controller 150, the color wheel 140 receives the light emitted by the first light source 120 in the corresponding non-spoke period T1 and emits the light corresponding to the subframe of primary color image data, and the light modulating device 160 modulates the light emitted by the color wheel in the corresponding non-spoke period T1 according to the subframe of primary color image data to generate the projection light. Further, the first light source 120 may be turned off during the spoke period T2 of the color wheel period T, and the second light source 130 is also turned off during the spoke period T2, that is, if the image data falls within the first color range F1, the first light source 120 may be turned on during the non-spoke period T1 of the color wheel period T, and the second light source 130 is turned off during both the non-spoke period T1 and the spoke period T2 of the color wheel period T.

If the color gamut determination module 170 determines that the color gamut range of the image to be displayed corresponding to one sub-frame primary color image data of the three sub-frame primary color image data falls within the second color gamut range F (e.g. the color gamut range corresponding to the red sub-frame image data or the green sub-frame image data falls within the second color gamut range F), the color gamut determination module 170 sends a control signal to the light source controller 150 to control the first light source 120 to be turned on during the corresponding non-spoke period T1 and control the second light source 130 to be turned off during the corresponding non-spoke period T1 via the light source controller 150, the color wheel 140 emits color light (e.g., red light, green light, or other color light containing a red or green light component) corresponding to the sub-frame primary color image data, the light modulation device 160 modulates the light emitted from the color wheel 140 in accordance with the sub-frame primary color image data during the non-spoke period T1 to generate at least part of projected light; the control signal from the color gamut determination module 170 further controls the first light source 120 to turn off during a corresponding spoke period T2 and controls the second light source 130 to turn on during a spoke period T2 of the color wheel period T via the light source controller 150, the second light source 130 emits a supplemental light (e.g., a red laser or a green laser) corresponding to the sub-frame primary color image data, and the light modulation device 160 modulates the supplemental light according to the sub-frame primary color image data during the spoke period T2 to generate another portion of projection light. The projection lens 180 sequentially displays a projection image (e.g., a red image or a green image) corresponding to the sub-frame primary color image data according to a portion of the projection light during the non-spoke period T1 and another portion of the projection light during the spoke period T2.

It can be seen that, since the color gamut of the supplemental light emitted by the second light source 130 is wider, the colors of the first color gamut range F2 beyond the first color gamut range F1 can be displayed, and the color gamut of the projection light emitted after the light modulation device 160 modulates the supplemental light is wider, so that the colors of the first color gamut range F2 beyond the first color gamut range F1 can also be displayed, and the colors of the image data can be more effectively restored, so that the colors of the projection image are more vivid.

If the color gamut determination module 170 determines that the color gamut corresponding to two sub-frame primary color image data of the three sub-frame primary color image data falls within the second color gamut range F (e.g. the color gamut corresponding to the red sub-frame image data and the green sub-frame image data falls within the second color gamut range F), the color gamut determination module 170 sends control signals to the light source controller 150 to control the first light source 120 to be turned on during the corresponding two non-spoke periods T1 and control the second light source 130 to be turned off during the corresponding two non-spoke periods T2 via the light source controller 150, the color wheel 140 sequentially emits color light (e.g., red light, green light, or other color light containing a red or green light component) corresponding to the sub-frame primary color image data, the light modulation device 160 modulates the light emitted from the color wheel 140 according to the two sub-frame primary color image data during the corresponding two non-spoke periods T1 to generate at least part of the projected light; the control signal from the color gamut determination module 170 further controls the first light source 120 to turn off during a spoke period T2 and controls the first laser 131 of the second light source 130 to turn on during a first spoke period T2 of the color wheel period T via the light source controller 150, the second light source 130 emits a first supplemental light (e.g., red laser R1), and the light modulation device 160 modulates the first supplemental light during the first spoke period T2 according to the sub-frame primary color image data to generate another portion of projection light. The control signal from the color gamut determination module 170 further controls the second laser 132 of the second light source 130 to turn on during a second spoke period T2 of the color wheel period T via the light source controller 150, the second light source 130 emits a second supplemental light (e.g., a green laser G1), and the light modulation device 160 modulates the second supplemental light according to the subframe primary color image data during the second spoke period T2 to generate a further portion of projection light. The projection lens 180 sequentially displays projection images corresponding to the two sub-frame primary color image data according to the partial projection light of the non-spoke period T1 and the two partial projection light of the first and second spoke periods T2.

It can be seen that, when the color gamut corresponding to the two sub-frame primary color image DATA falls within the second color gamut F, the second light source 130 emits the first supplemental light and the second supplemental light in different time division periods T2, the light modulation device 160 modulates the first supplemental light and the second supplemental light according to the two sub-frame primary color image DATA in time division, since the color gamut of the first supplemental light and the second supplemental light emitted by the second light source 130 is wider, the color of the second color gamut F exceeding the first color gamut F1 can be displayed, and the color gamut of the projection light emitted after the light modulation device 160 modulates the supplemental light is wider, so that the color of the second color gamut F exceeding the first color gamut F1 can also be displayed, and the color of the image DATA can be more effectively reduced, so that the color of the projection image is more vivid.

Compared with the prior art, in the projection system 100, the second light source 130 may emit supplementary light to widen the color gamut of the projection system 100, the color gamut determining module 170 determines the color gamut range of an image to be displayed according to the image DATA, and outputs a control signal to control the turning on and off of the first light source 120 and the second light source 130 according to the determination result, so that the light modulation device 160 performs image modulation on the light emitted by the color wheel 140 and the supplementary light to generate projection light required for projecting an image, and the supplementary light emitted by the second light source 130 can effectively widen the color gamut of the projection system 100.

The color gamut determining module 170 determines a color gamut range according to the image DATA and controls the two

light sources

120 and 130 to be turned on and off, and may further select which of the at least two color lights and the supplemental light is modulated according to the color gamut range of the image DATA, so that the color gamut range of the image DATA is adapted to the light modulated by the light modulation device 160, thereby effectively improving the picture color distortion phenomenon, and the projection system 100 has a wider color gamut range, vivid picture colors, and a better display effect.

Second embodiment

Referring to fig. 7 and 8, fig. 7 is a block diagram of a projection system 200 according to a second embodiment of the present invention, and fig. 8 is a structural diagram of a color wheel 240 of the projection system 200 according to the second embodiment of the present invention. The projection system of the second embodiment is similar to the projection system of the first embodiment, that is, most of the description of the first embodiment above can be basically applied to the second embodiment, and the difference between them is mainly that: the structure of the color wheel 240, the number of spatial light modulators of the light modulation device, and the driving timing of the light source and the spatial light modulator are different. It is to be understood that the following description mainly refers to the differences between the second embodiment and the first embodiment, and the descriptions of the parts of the second embodiment that are the same as the first embodiment are omitted.

Specifically, as shown in fig. 8, in the second embodiment, the color wheel 240 includes two segment regions 241, namely a first segment region B and a second segment region Y, which are sequentially arranged along the circumferential direction. The first segment region B is used for emitting a first color light, such as blue light, when the first light source 220 is a blue light source, a scattering material may be disposed on the first segment region B, and the light emitted by the first light source 220 may be emitted after being scattered by the first segment region B; when the first light source 220 is an ultraviolet light source, a first wavelength conversion material may be disposed on the first segment region B, and the light emitted from the first light source 200 may excite the first wavelength conversion material to generate the first color light, such as blue light. The second segment region Y is used for emitting a second color light, such as a yellow light, and a second wavelength conversion material, such as a yellow phosphor, may be disposed on the second segment region Y, and the light emitted from the first light source 220 may excite the second wavelength conversion material to generate the second color light, i.e., the yellow light.

Further, in the embodiment shown in fig. 8, each of the first and second segment regions B and Y includes a non-spoke region 241a and a partial spoke region 241B adjacent to another segment region. Wherein two partial spoke regions 241B between the non-spoke regions 241a of the first and second segment regions B and Y can be defined as a spoke region 242; two other partial spoke regions 241B between the second segment region Y and the non-spoke region 241a of the first segment region B may be defined as another spoke region 242.

Further, in the second embodiment, the projection system 200 includes two spatial light modulators: a first spatial light modulator 261 and a second spatial light modulator 261. Wherein the first spatial light modulator 261 is operable to modulate an image in accordance with a first sub-frame primary image data of the three sub-frame primary image data, and the second spatial light modulator 262 is operable to modulate an image in accordance with second and third sub-frame primary image data of the three sub-frame primary image data.

As shown in fig. 9, each color wheel period T in the present embodiment includes two non-spoke periods T1 and two spoke periods T2. The three sub-frame primary color image data correspond to the two non-spoke periods T1, respectively, that is, one of the non-spoke periods T1 corresponds to two sub-frame primary color image data (e.g., the first non-spoke period T1 corresponds to red sub-frame image data and green sub-frame image data), the color wheel also emits color light corresponding to the two sub-frame image data (e.g., the second segment region Y emits yellow light) in the non-spoke period T1, the first spatial light modulator 261 modulates the light emitted from the color wheel 240 in the non-spoke period T1 according to the corresponding sub-frame primary color image data (e.g., red sub-frame image data) to generate projection light, and the second spatial light modulator 262 modulates the light emitted from the color wheel 240 in the same non-spoke period T1 according to another sub-frame primary color image data (e.g., green sub-frame image data) to. The other non-spoke period T1 corresponds to another sub-frame primary color image data (e.g., blue sub-frame image data), the color wheel 240 also emits the color light corresponding to the another sub-frame image data (e.g., blue light emitted from the first segment region B) in the other non-spoke period T1, and the second spatial light modulator 262 also modulates the light emitted from the color wheel 240 in the other non-spoke period T1 according to the another sub-frame primary color image data to generate the projection light.

It can be understood that, as shown in fig. 9, if the color gamut determining module 270 determines that the color gamut ranges of the images to be displayed corresponding to the three-subframe primary color image data all fall within the first color gamut range F1, since the color gamut ranges corresponding to the three-subframe primary color image data can be displayed without passing through the second light source 130, in the whole color wheel cycle T corresponding to the three-subframe primary color image data, under the control of the control signal output by the color gamut determining module 270 to the light source controller 250, the second light source 230 may be always turned off, and the first light source 220 may be turned on in the non-spoke period T1 and turned off in the spoke period T2. When the first light source 220 is turned off in the spoke period T2, the color wheel which is easy to turn on in the spoke period T2 can be prevented from emitting a spoke effect caused by light of two colors at the same time, and the color distortion of the image caused by the spoke effect is reduced, however, when the influence of the color distortion is not large or is not considered, it is also possible that the first light source 220 is turned on in the spoke period T2.

As shown in fig. 10, if the color gamut determining module 270 determines that the color gamut range of the image to be displayed corresponding to one sub-frame primary color image data in the three sub-frame primary color image data is within the second color gamut range F (e.g. the color gamut range corresponding to the red sub-frame image data is within the second color gamut range F), the color gamut determining module 270 sends out a control signal to control the first light source 220 to turn on in the corresponding non-spoke period T1 and to control the second light source 230 to turn off in the corresponding non-spoke period T1 via the light source controller 250, the color wheel 240 sends out the color light (red light; or other color light containing red light component, e.g. yellow light) corresponding to the sub-frame primary color image data, the first spatial light modulator 261 modulates the light sent out by the color wheel 240 according to the sub-frame primary color image data (e.g. green sub-frame image data) in the non-spoke period T1, the second spatial light modulator 262 modulates the light emitted from the color wheel in accordance with another sub-frame primary image data (e.g., red sub-frame image data) during the non-spoke period T1 to generate another portion of projected light.

Further, the control signal from the color gamut determining module 270 further controls the first light source 220 to be turned off in one or two spoke periods T2 of the color wheel period T and controls the second light source 230 to be turned on in one or two spoke periods T2 of the color wheel period T via the light source controller 250, the second light source 230 emits the supplemental light (e.g., red laser) corresponding to the sub-frame primary color image data, and the second spatial light modulator 262 modulates the supplemental light in the spoke period T2 according to the sub-frame primary color image data to generate a further portion of projection light.

The control signal from the color gamut determination module 270 further controls the first light source 220 to be turned on during another non-spoke period T1 of the color wheel period T and controls the second light source 230 to be turned off during the other non-spoke period T1 via the light source controller 250, the color wheel 240 emits color light (e.g., blue light) corresponding to another sub-frame primary color image data (e.g., blue sub-frame image data), and the second spatial light modulator 262 modulates the light emitted by the color wheel 240 during the other non-spoke period T1 according to the another sub-frame primary color image data (e.g., blue sub-frame image data) to generate projection light.

As shown in fig. 11, if the color gamut determining module 270 determines that the color gamut ranges of the images to be displayed corresponding to two sub-frame primary color image data in the three sub-frame primary color image data are within the second color gamut range F (e.g. the color gamut ranges corresponding to the red sub-frame image data and the green sub-frame image data are both within the second color gamut range F), the color gamut determining module 270 sends out control signals to control the first light source 220 to be turned on in the corresponding first non-spoke period T1 and control the second light source 230 to be turned off in the first non-spoke period T1 via the light source controller 250, the color wheel 240 sends out color light (e.g. yellow light containing red light and green light components) corresponding to the two sub-frame primary color image data, the first spatial light modulator 261 modulates the light sent out by the color wheel 240 according to the one sub-frame primary color image data (e.g. green sub-frame image data) in the first non-spoke period T1 to generate, the second spatial light modulator 262 modulates the light emitted from the color wheel 240 in accordance with another sub-frame primary image data (e.g., red sub-frame image data) during the first non-spoke period T1 to generate another portion of projected light.

Further, the control signal from the color gamut determining module 270 further controls the first light source 220 to turn off during the spoke period T2 of the color wheel period T via the light source controller 250 to reduce the spoke effect, and controls the first laser (e.g., red laser) of the second light source 220 to turn on to emit the first supplemental light during one or two spoke periods T2 of the color wheel period T, and the second spatial light modulator 262 modulates the first supplemental light (e.g., red laser) during the one or two spoke periods T2 to generate the projection light.

Still further, the control signal from the color gamut determining module 270 further controls a second laser (e.g., a green laser) of the second light source 220 to turn on to emit a second supplemental light (e.g., a green laser) in the spoke period(s) T2 of the color wheel period T or the second non-spoke period T1 'different from the first non-spoke period T1 via the light source controller 250, and the first spatial light modulator 261 modulates the second supplemental light according to the further subframe image data (blue subframe image data) in one or two spoke periods T2 of the color wheel period T or the second non-spoke period T1' different from the first non-spoke period T1 to generate projection light. In this embodiment, the color gamut determining module 270 further controls the second laser of the second light source 230 to turn on to emit a second supplemental light (e.g., green laser) in the partial time periods of at least one spoke period T2 and a second non-spoke period T1 'of the color wheel cycle T, and the first spatial light modulator 261 modulates the second supplemental light according to the another sub-frame image data (blue sub-frame image data) in the partial time periods of at least one spoke period T2 and a second non-spoke period T1' of the color wheel cycle T to generate the projection light. It is understood that the first non-spoke period T1 and the second non-spoke period T1' are two different non-spoke periods.

It is understood that in this embodiment, the first supplemental light is red laser R1, which is mainly provided to the corresponding spatial light modulator (e.g. the second spatial light modulator 262) during the spoke period T2, so as to ensure that the first supplemental light is modulated in time division with the light (e.g. red light and blue light) emitted by the color wheel 240 modulated by the second spatial light modulator 262, thereby avoiding timing confusion; the second supplemental light is green laser G1, which may be provided to the corresponding spatial light modulator (e.g. the first spatial light modulator 261) during any period when the color wheel 240 does not emit light with green light components (i.e. the spoke period or the non-spoke period when the color wheel does not emit light with green light components), so that it is ensured that the second supplemental light (e.g. green laser) is modulated in time with the light (e.g. green light) emitted by the color wheel modulated by the first spatial light modulator 261, thereby avoiding timing confusion.

It is understood that, in a modified embodiment of the second embodiment, as shown in fig. 12, the two segment regions of the color wheel 240 may be a first segment region C and a second segment region Y, respectively, the first segment region C may carry cyan phosphor emitting cyan light, i.e., a mixture of blue light and green light, and the second segment region Y may carry yellow phosphor emitting yellow light. Correspondingly, the first spatial light modulator 261 may modulate the first segment region C to emit cyan light according to the green sub-frame image data to generate projection light when the first segment region C emits cyan light, and the second spatial light modulator 262 may modulate the first segment region C to emit cyan light according to the blue sub-frame image data to generate projection light when the first segment region C emits cyan light. Specifically, before modulation, the cyan light needs to be filtered to respectively filter out blue light and green light, the first spatial light modulator modulates the filtered green light according to green subframe image data to generate projection light, and the second spatial light modulator modulates the filtered blue light according to the blue subframe image data to generate projection light. The second spatial light modulator 262 also modulates the yellow light according to the red sub-frame image data to generate the projection light when the second segment region Y emits the yellow light, or modulates the yellow light according to both the red sub-frame image data and the green sub-frame image data to generate the projection light.

In the above embodiment, the first spatial light modulator 261 modulates the green sub-frame image data, and the second spatial light modulator 262 time-divisionally modulates the red sub-frame image data and the blue sub-frame image data. However, in the modified embodiment, the first spatial light modulator 261 may modulate the green sub-frame image data and the red sub-frame image data in a time-division manner, and the second spatial light modulator 262 may modulate the blue sub-frame image data, or the first spatial light modulator may modulate the green sub-frame image data and the blue sub-frame image data in a time-division manner, and the second spatial light modulator 262 may modulate the red sub-frame image data, and the like, and the present invention is not limited to the above, and may be configured so as to modulate the light emitted from the color wheel in a time-division manner in accordance with the three sub-frame primary color image data.

In the second embodiment and the modified embodiments thereof, the color gamut determining module 270 determines the color gamut range of the image to be displayed according to the image DATA, and outputs a control signal to control the on and off of the first light source 220 and the second light source 230 according to the determination result, so that the two spatial

light modulators

261 and 262 perform image modulation on the at least two color lights and the supplemental light to generate the projection light required for projecting the image, and the supplemental light emitted by the second light source 230 not only effectively widens the color gamut of the projection system 200. The color gamut determining module 270 determines, according to the image DATA, that a color gamut range sends a control signal to control the two

light sources

220 and 230 to be turned on and off via the light source controller 250, and may further select, according to the color gamut range of the image DATA, which of the at least two color lights and the supplemental light is modulated, so that the color gamut range of the image DATA is adapted to the lights modulated by the spatial

light modulators

261 and 262, thereby effectively improving the picture color distortion phenomenon, and the projection system has a wider color gamut range, vivid picture colors, and a better display effect.

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

1. A projection system, characterized by: the projection system includes:

the light modulation device is used for carrying out image modulation on the primary light and the supplementary light so as to generate projection light required by an image to be displayed;

the color gamut judging module sends a control signal to the light source controller if the color gamut judging module judges that at least part of the color gamut range of the image to be displayed corresponding to one subframe of primary color image data is within the second color gamut range, and the light source controller controls the first light source and the second light source to be turned on in a time-sharing manner.

2. The projection system of claim 1, wherein: the projection system further includes a color wheel including at least two segment regions receiving the primary color light and emitting converted light corresponding thereto, the converted light including at least two colors of light, the second light source including at least one laser, and the supplemental light including laser light.

3. The projection system of claim 2, wherein: when light spots formed on the color wheel by the primary light irradiation cross two segment areas, the irradiated areas are spoke areas, areas outside the spoke areas in the segment areas are non-spoke areas, a corresponding time period of the non-spoke area of each segment area is a non-spoke period, each segment area receives the primary light and emits corresponding color light in the non-spoke period, and a time period between two adjacent non-spoke periods is a spoke period corresponding to the spoke area;

each color wheel period comprises at least two non-spoke periods and at least two spoke periods, and each color wheel period corresponds to the frame of image data;

if the color gamut judging module judges that at least part of the color gamut range of the image to be displayed corresponding to one subframe primary color image data is in the second color gamut range, the color gamut judging module sends a control signal to the light source controller to control the first light source to be turned on in a non-spoke period of the color wheel period corresponding to the subframe primary color image data, the color wheel emits color light corresponding to the subframe primary color image data in the non-spoke period, and the light modulation device modulates the light emitted by the color wheel according to the subframe primary color image data in the non-spoke period; the light source controller also controls the second light source to start emitting the supplement light in a spoke period of the color wheel period, and the light modulation device also modulates the supplement light in the spoke period according to the sub-frame primary color image data, wherein the supplement light and the light emitted by the color wheel at least comprise primary color components of the sub-frame primary color image data.

4. A projection system according to claim 3, wherein: the second light source comprises a first laser and a second laser which respectively emit first supplementary light and second supplementary light, if at least part of a color gamut range corresponding to two sub-frame primary color image data in the three sub-frame primary color image data is not in the first color gamut range, the light source controller controls the first light source to be turned on in a non-spoke period of the color wheel period corresponding to the two sub-frame primary color image data, the color wheel emits color light containing primary color components corresponding to the two sub-frame primary color image data in the non-spoke period, and the light modulation device modulates the emitted light according to the two sub-frame primary color image data in the non-spoke period;

the light source controller further controls the second light source to be turned on to emit the first supplement light in a first spoke period of at least two spoke periods of the color wheel period, the light source controller further controls the second light source to be turned on to emit the second supplement light in a second spoke period of the at least two spoke periods, and the light modulation device modulates the first supplement light and the second supplement light according to the two sub-frame primary color image data in the first spoke period and the second spoke period respectively.

5. A projection system according to claim 3, wherein: the second light source comprises a first laser and a second laser which respectively emit first supplementary light and second supplementary light, the light modulation device comprises a first spatial light modulator and a second spatial light modulator, the first spatial light modulator is used for modulating first subframe primary color image data in the three-subframe primary color image data, and the second spatial light modulator is used for modulating second subframe primary color image data and third subframe primary color image data in the three-subframe primary color image data;

the first spatial light modulator modulates light correspondingly emitted by the color wheel in a first non-spoke period of the at least two non-spoke periods according to the first subframe primary color image data;

the second spatial light modulator modulates the light correspondingly emitted by the color wheel according to the second subframe primary color image data and the third subframe primary color image data respectively in the at least two non-spoke periods;

if the color gamut judging module judges that at least part of the color gamut range of the image to be displayed corresponding to the primary color image data of the first subframe in the three-subframe primary color image data is in the second color gamut range, the color gamut judging module outputs a control signal to the light source controller to control the second light source to start to emit the first supplement light in a spoke period of the color wheel cycle or a second non-spoke period different from the first non-spoke period in the two non-spoke periods, and the first spatial light modulator also modulates the first supplement light according to the first sub-frame primary color image data in the spoke period or the second non-spoke period of the color wheel cycle;

if the color gamut judging module judges that at least part of the color gamut range corresponding to the second subframe primary color image data in the three-subframe primary color image data is in the second color gamut range, the color gamut judging module outputs a control signal to the light source controller to control the second light source to start emitting the second supplement light in at least one spoke period of the color wheel period, and the second spatial light modulator also modulates the second supplement light in at least one spoke period of the color wheel period according to the second subframe primary color image data.

6. The projection system of claim 5, wherein: if the color gamut judging module judges that at least parts of color gamut ranges corresponding to first subframe primary color image data and second subframe primary color image data in the three-subframe primary color image data are both in the second color gamut range, the color gamut judging module outputs a control signal to the light source controller to control the second light source to start emitting the first supplement light and the second supplement light in a spoke period of the color wheel period, and the first spatial light modulator also modulates the first supplement light according to the first subframe primary color image data in the spoke period of the color wheel period; the second spatial light modulator also modulates the second supplemental light in accordance with the second sub-frame primary color image data during a spoke period of the color wheel cycle.

7. The projection system of claim 6, wherein: if the color gamut judging module judges that the first sub-frame primary color image data in the three sub-frame primary color image data is in the second color gamut range, the color gamut judging module outputs a control signal to the light source controller to control the second light source to start emitting the first supplement light in the spoke period and the second non-spoke period of the color wheel period, and the first spatial light modulator modulates the first supplement light according to the first sub-frame primary color image data in the spoke period and the second non-spoke period of the color wheel period.

8. The projection system of claim 2, 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.

9. The projection system of any of claims 4, 5, 6, and 7, wherein: the three-subframe primary color image data are respectively red subframe image data, green subframe image data and blue subframe image data, the color wheel correspondingly emits yellow light and blue light in the at least two non-spoke periods, the light modulation device modulates the yellow light according to the red subframe image data and the green subframe image data in the non-spoke period in which the color wheel emits the yellow light, the light modulation device modulates the blue light according to the blue subframe image data in the non-spoke period in which the color wheel emits the blue light, the first supplement light is one of red laser and green laser, and the second supplement light is the other of the red laser and the green laser.

10. The projection system of any of claims 4, 5, 6, and 7, wherein: the three-subframe primary color image data are respectively red subframe image data, green subframe image data and blue subframe image data, the color wheel correspondingly emits yellow light and cyan light in the at least two non-spoke periods, the light modulation device modulates the yellow light according to the red subframe image data in the non-spoke period in which the color wheel emits the yellow light, the light modulation device modulates the cyan light according to the blue subframe image data and the green subframe image data in the non-spoke period in which the color wheel emits the cyan light, the first supplementary light is one of red laser and green laser, and the second supplementary light is the other of the red laser and the green laser.