WO2016161934A1 - 一种投影系统及其色域控制方法 - Google Patents

一种投影系统及其色域控制方法 Download PDF

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Publication number
WO2016161934A1
WO2016161934A1 PCT/CN2016/078540 CN2016078540W WO2016161934A1 WO 2016161934 A1 WO2016161934 A1 WO 2016161934A1 CN 2016078540 W CN2016078540 W CN 2016078540W WO 2016161934 A1 WO2016161934 A1 WO 2016161934A1
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Prior art keywords
light
color
color light
signal
primary
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English (en)
French (fr)
Inventor
郭祖强
胡飞
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present invention relates to the field of projectors, and more particularly to a projection system and a gamut control method thereof.
  • DLP projection display technology has been widely used in the field of projection display. Its core component spatial light modulator DMD, with its fast response speed, can realize color projection display with time-switched primary color light, thereby making a monolithic DMD.
  • the projection system has become a more mature technology.
  • the monolithic DMD projection system is widely used in the low-end and mid-end markets because of its simple structure and low cost.
  • US Pat. No. 7,547,114 B2 provides a method for a semiconductor laser to excite different fluorescent pink segments on a color wheel to form different primary colors of light. The method has the advantages of high light efficiency and small optical expansion, and thus develops rapidly. Ideal for projector light sources.
  • the red light phosphor or the orange phosphor which generates red light has low excitation efficiency, and the fluorescence generated at the same time needs to be filtered with the corresponding filter to filter out the short-wavelength light to make the red light. More pure, this results in a very low red fluorescence efficiency. Therefore, for the system, the luminance of red light is a lower proportion of the overall luminance, which results in deterioration of image quality.
  • the color gamut requirements of the projection system are different in different occasions, so the projection system needs to implement different color gamuts.
  • the color gamut is mainly adjusted by the DDP control program DDP. Specifically, the color coordinates of the three primary colors are adjusted by a CCA (color coordinate adjust) algorithm.
  • the existing DMD projection system is shown in FIG. 1: the system includes a laser light source 101, collection lenses 102, 104, a color wheel 103, a square bar 105, an optical relay system 106, a TIR prism 107, a DMD chip 108, and a control device 109 thereof. , projection lens 110.
  • the laser light source 101 adopts a 445 nm blue laser module, is focused by the collecting lens 102, and is incident on the fluorescent pink wheel 103 as shown in FIG. 2.
  • the color wheel is divided into three parts, and the blue section is coated with scattering powder, so that the blue laser eliminates partial coherence. After the exit, in the green and red segments, the blue laser excites the phosphor to produce green fluorescence and red fluorescence. After rotating the color wheel, the time-series three primary colors are generated, and the color gamut is shown in FIG.
  • the light emitted by the color wheel is collected by the collecting lens 104, then enters the square bar 105 for homogenization, is homogenized, is incident on the TIR prism 107 via the optical relay system 106, is reflected by the TIR prism, and reaches the DMD 108, and passes through the DMD control device 109.
  • the modulated light is transmitted through the TIR prism 107, reaches the projection lens 110, and finally images.
  • the DMD control device 109 operates as shown in FIG. 4, and the DVI decoded RGB image signal is input to the DMD.
  • the RGB three primary color optical signals are outputted to the DMD, and the DMD is inverted according to the gray value of each signal.
  • the CCA algorithm is for color coordinate correction, taking the red base color coordinate adjustment as an example. If the red color coordinate needs to be corrected, the DDP will control a part of the green light to be incorporated into the red light, thereby realizing the red light correction. For example, if the video signal RGB is (255, 0, 0), the RGB signal parsed by the DDP is (255, 1, 0), and the like.
  • the present invention provides a projection system including a light source and a control system, the light source providing at least four color lights that are sequentially emitted, including a first color light, a second color light, a third color light, and a fourth color light;
  • the control system includes a decoding unit, a signal conversion unit, and a spatial light modulator;
  • the decoding unit is configured to parse the data to be displayed into a first primary color optical signal, a second primary color optical signal, and a third primary color optical signal;
  • the signal conversion unit is configured to convert the first primary color optical signal into the first The control signal and the second control signal convert the second primary color optical signal into a third control signal, and convert the third primary color optical signal into a fourth control signal;
  • the spatial light modulator modulates the first color light incident thereon under the action of the first control signal, and modulates the second color light incident thereon under the action of the second control signal, in the third control
  • the third color light incident thereon is modulated by the signal, and the fourth color light incident thereon is modulated by the fourth control signal;
  • the brightness of the first color light and the second color light mixed is the same as the brightness of the first primary color light signal parsed by the data to be displayed, and the color coordinates of the first color light and the second color light are mixed The color coordinates of the first primary color light signal from which the data is displayed are the same.
  • the projection system provided by the present invention controls the timing light combining two color lights that are close in time by a primary color optical signal, thereby improving the utilization of color light; the first color light and the second color for performing sequential illumination
  • the setting of the brightness and color coordinates of the color light refers to the brightness and color coordinates of the first primary color light to ensure the image quality, and the color gamut can be conveniently adjusted by setting the brightness ratio between the first color light and the second color light. Especially when there are multiple such projection systems spliced display, the color gamut can be easily adjusted.
  • Still another aspect of the present invention provides a color gamut adjustment method of a projection system, the projection system including a light source and a control system, the light source providing at least four color lights that are emitted in a time series, including a first color light, a second color light, Third color light and fourth color light;
  • the control system includes a decoding unit, a signal conversion unit, and a spatial light modulator, the decoding unit configured to parse data to be displayed into a first primary color light signal, a second primary color optical signal, and a third primary color optical signal;
  • the signal conversion unit is configured to convert the first primary color optical signal into a first control signal and a second control signal, convert the second primary color optical signal into a third control signal, and convert the third primary color optical signal into a fourth control signal ;
  • the spatial light modulator modulates the first color light incident thereon under the action of the first control signal, and modulates the second color light incident thereon under the action of the second control signal, in the third control
  • the third color light incident thereon is modulated by the signal, and the fourth color light incident thereon is modulated by the fourth control signal;
  • the brightness of the first color light and the second color light mixed is the same as the brightness of the first primary color light signal parsed by the data to be displayed, and the color coordinates of the first color light and the second color light are mixed The color coordinates of the first primary color light signal from which the data is displayed are the same.
  • the control method controls that the mixed color coordinates of the first color light and the second color light are the same as the first primary color signal, and the color coordinates of the first and second color lights are the same as the signals of the first primary color light, and the first adjustment is performed.
  • the ratio between the color light and the second color light can conveniently control the color gamut of the projection system, and the projection system can be adapted to different display standard requirements.
  • Figure 1 is a diagram of a conventional projection system
  • FIG. 2 is a structural diagram of a color wheel in a conventional projection system
  • 3 is a color gamut diagram of a conventional projection system
  • Figure 5 is a view showing a projection system according to Embodiment 1 of the present invention.
  • FIG. 6 is a structural diagram of a color wheel of a projection system according to Embodiment 1 of the present invention.
  • Figure 7 is a diagram showing a control system of a projection system according to Embodiment 1 of the present invention.
  • Embodiment 8 is a timing chart of controlling a DMD modulation color light by a control signal according to Embodiment 1 of the present invention.
  • FIG. 9 is a diagram showing driving current intensity corresponding to each color light according to Embodiment 1 of the present invention.
  • Figure 10 is a color gamut diagram of Embodiment 1 of the present invention.
  • FIG. 11 is a schematic diagram showing the duty ratio of driving current corresponding to each color light according to the embodiment of the present invention.
  • FIG. 13 is a diagram showing a control system when signal conversion is externally performed according to Embodiment 2 of the present invention.
  • Figure 14 is a structural diagram of a color wheel of a projection system according to Embodiment 4 of the present invention.
  • Figure 15 is a color gamut diagram of Embodiment 4 of the present invention.
  • the present invention provides a color gamut control method for a projection display system or a projection system, comprising a light source and a control system, wherein the light source can emit at least four color lights in time series, for example, a light source emitting different colors.
  • Time-division illumination forms a time-series color, preferably a common solid-state source laser or LED, or a rotating color wheel to emit time-series light.
  • the light source in the present invention comprises an excitation light source, a monochromatic illumination source and a color wheel 505.
  • the excitation source is a laser or laser module 501 that emits 445 nm blue light
  • the monochromatic illumination source is a red laser or a red laser mode that emits 638 nm red light.
  • the color wheel is a four-stage type for emitting the first color light, the second color light, the third color light, and the fourth color light, and the specific first color light is red light generated by the red laser or the red laser module 502 (for For ease of understanding, hereinafter referred to as red laser light
  • the second color light is orange light generated by the orange phosphor particle segment on the 445 nm blue laser excitation color wheel 505 (for ease of understanding, hereinafter referred to as orange fluorescence)
  • the third color light is green light
  • the four-color light is blue light.
  • the transparent diffuser section of the four-stage color wheel emits red laser light, the orange fluorescent powder section emits orange fluorescence, the green fluorescent powder section emits green fluorescence, and the scattering section emits blue light.
  • the third color green light and the fourth color light blue light may also be provided by a green light emitting element such as a green laser or a blue laser.
  • FIG. 5 shows a specific structure of the projection system of the present embodiment, including a 445 nm blue laser 501 serving as an excitation light source, a red laser 502 serving as a monochromatic illumination source, a dichroic mirror 503, collecting lenses 504 and 506, and color. Wheel 505, square bar 507, optical relay system 508, TIR prism 509, DMD chip 510 and signal conversion portion 511, projection lens 512.
  • the blue laser light emitted from the excitation light source 501 and the red laser light emitted from the red laser 502 are combined at the dichroic mirror 503, two directions
  • the color mirror transmits blue light to reflect red light, and the combined light beam is focused by the collecting lens 504 onto the color wheel 505.
  • the red laser can also be placed after the color wheel and combined with the light passing through the color wheel. This embodiment is for example. Other combined light positions and light combining methods are not listed here.
  • the color wheel 505 is a four-stage color wheel as shown in FIG. 6, wherein the blue laser 501 is turned on when the orange phosphor segment, the green phosphor segment or the scattering segment of the color wheel is on the optical axis of the light source, and the blue laser excites the green fluorescent light.
  • the powder segment and the orange phosphor segment produce green fluorescence and orange fluorescence and transmit; after the scattering segment blue laser is scattered, it transmits.
  • the blue laser 501 is turned off, the red laser 502 is turned on, and the red laser is transmitted through the collimator lens 504 to the diffuser segment.
  • the time-series light emitted from the color wheel 505 passes through the collecting lens 506 and enters the square bar 507. After the light is dimmed, it reaches the TIR prism 509 via the optical relay system 508, and is reflected and reaches the DMD chip 510. Under the control of the signal converted by the signal converting unit 511, The DMD chip 510 modulates the incident light, and the modulated light is transmitted through the TIR prism 509 and finally imaged by the projection lens 512.
  • the color wheel in the present embodiment may also be of a total reflection type as long as it can provide at least four kinds of color lights that are emitted at a time.
  • the color wheel in the present embodiment exemplifies the present invention only as a preferred mode.
  • the color wheel may also contain only orange phosphor for providing orange fluorescence, and other color lights may be provided by the light-emitting element.
  • the control system includes a decoding unit, a signal conversion unit, and a spatial light modulator.
  • the decoding unit parses the data to be displayed into a first primary color optical signal R, a second primary color optical signal G, and a third primary color.
  • the optical signal B; the signal conversion unit 511 is a control unit DDP of the DMD, and the present embodiment has a signal conversion function by modifying the program of the control unit DDP of the DMD.
  • the modified DDP converts the first primary color optical signal R into a first control signal R1 and a second control signal R1 or R2, converts the second primary color optical signal G into a third control signal G1, and the third primary color light
  • the signal B is converted into a fourth control signal B1;
  • the spatial light modulator is a digital micromirror DMD that modulates the first color red laser light incident thereon under the action of the first control signal R1, in the second
  • the control signal R2 modulates the second color light orange fluorescence incident thereon, and modulates the third color light green fluorescence incident thereon under the action of the third control signal G1, and acts on the fourth control signal B1.
  • the fourth color light blue laser incident thereon is modulated.
  • the above four-color light is not limited to a laser, and may be light generated by an LED.
  • the DMD modulates the time-series color light
  • the brightness of the first color light red laser and the second color light orange fluorescence is the same as the brightness of the first primary color light signal R parsed by the data to be displayed
  • the first The color coordinates of the mixed color of the color light red laser and the second color light orange are set to be the same as the color coordinates of the first primary color light signal R precipitated from the data to be displayed, thereby ensuring the image quality of the display.
  • the data to be displayed is decoded by DVI into a first primary color optical signal R, a second primary color optical signal G, and a third primary color optical signal B, and the primary color optical signal is converted into four control signals R1, R2, G1, and B1 by DDP processing, which is equivalent.
  • the first primary color optical signal R is repeated in time sequence.
  • the actually incident light on the DMD and the DMD processed signal are as shown in FIG. 8, that is, during the time of the R1 and R2 control signals, the DMD is actually processed separately.
  • Red laser R and orange fluorescence O are Specifically, as shown in FIG.
  • the actual emitted red light brightness is a/255 ⁇ L R ' (L R ' is the maximum brightness of the red laser), the color coordinate is (x, y), and the actual emitted brightness Refers to the actual brightness received by the human eye, that is, the gray level brightness, such as a / 255 ⁇ L R '; assuming that the red laser emits red laser brightness is b / 255 ⁇ L R (L R is the maximum of the red laser Brightness), the color coordinate is (x R , y R ), the orange fluorescent brightness generated by the excited orange phosphor is c/255 ⁇ L O (L O is the maximum fluorescence of orange fluorescence), and the color coordinates are (x O , y O ) , then
  • the gradation value a of the first primary color light signal is converted into a first control signal having a gray value of b and a second control signal having a gray value of c, and the first control signal gradation value b and the second control signal are changed.
  • the gray value c by controlling the degree of inversion of the DMD, can change the ratio between the red laser and the orange fluorescence, thereby changing the color coordinates of the red light after mixing the red laser and the orange fluorescence, and at the same time, the corresponding green fluorescence and the scattered
  • the gray value of the blue light also needs to be changed, and the red light maintains a white balance when mixed.
  • the above signal conversion is performed by the signal conversion unit 511 of the control system, specifically, directly by the modified DDP.
  • the gradation values of the first control signal and the second control signal after the gradation value a of the first primary color optical signal is converted by the signal conversion unit 511 are both set to a, assuming that the first primary color optical signal R is grayscaled.
  • the value is a (0 ⁇ a ⁇ 255), after the DDP conversion, the gray values of the first and second control signals are both a, and the first control signal with the gray value of a controls the red laser and the second control signal. Controlling the second primary color light, that is, orange fluorescence, is modulated on the spatial light modulator.
  • the actual emitted red light brightness is a/255 ⁇ L R ' (L R ' is red light Maximum brightness)
  • the color coordinate is (x, y)
  • the red laser R light brightness is a / 255 ⁇ L R (L R is the maximum brightness of the red laser)
  • the color coordinates are (x R , y R )
  • the light O brightness is a/255 ⁇ L O (L O is the maximum brightness of orange fluorescence)
  • the color coordinates are (x O , y O )
  • the time-series light of the red laser and the orange fluorescence is realized, and the two are mixed to obtain the red light required by the system, the brightness is L R ', and the color coordinate is (x, y). Since the red light is obtained by mixing two kinds of light, if the ratio of the two kinds of light changes, the red color coordinate obtained after the mixing also changes accordingly.
  • the control system further includes a light source driving control portion that adjusts a luminance ratio of the first color light and the second color light by controlling a driving current intensity or a current duty ratio of the first color light and the second color light.
  • the light source driving control unit further controls a driving current intensity or a duty ratio of the third color light or the fourth color light to cause the data to be displayed to reach a predetermined white balance; or the signal converting portion further configures the gray of the third color light or the fourth color light.
  • the value of the value is such that the data to be displayed reaches a predetermined white balance.
  • the white balance refers to the requirement that the color coordinates of the white light obtained after the various color lights are mixed together meet certain standards, such as the requirement of white light of REC.709 (0.31, 0.33). , DCI standard requirements for white light (0.314, 0.351).
  • the red laser luminance L R and the orange fluorescent luminance L O are determined by the magnitude of the driving current thereof. Therefore, by changing the driving current corresponding to the red laser and the excitation light source by the light source driving control portion of the control system, the change can be changed.
  • the red laser brightness L R corresponds to the brightness of the orange fluorescent L O , thereby changing the finally obtained red color coordinate, as shown in FIG. 9 , reducing the driving current intensity of the excitation light source corresponding to the orange fluorescent segment, and improving the red laser segment red laser.
  • the intensity of the driving current increases the ratio of the red laser in the two, so that the mixed red light coordinates expand in a redder direction, as shown in FIG.
  • the corresponding excitation light source driving current intensity corresponding to the scattered blue light and the green fluorescent light is required.
  • the light source driving unit control unit adopts a PWM driving current modulation method to adjust the current excitation intensity by changing the duty ratio of each segment driving current, thereby changing the brightness of each segment, and changing the red color coordinate. At the same time, keep the white balance.
  • the present embodiment is different from the above-described embodiment in that the signal conversion unit 511 is different from the DDP and is an external signal conversion device.
  • the DMD control program DDP it is necessary to modify the intrinsic program and In the embodiment, the color wheel and the light timing correspond to each other.
  • the DDP intrinsic program is not modified, and the external signal conversion device 511 is used.
  • FPGA as shown in Figure 13.
  • the first primary color optical signal R, the second primary color optical signal G, and the third primary color optical signal B parsed by the DVI pass through the signal conversion device 511, and become the first control signal R1, the second control signal O1, and the third control signal.
  • the G1 and the fourth control signal B1, DDP are arranged in four segments, namely R1, O1, G1 and B1 segments, respectively, and the control DMD processes the first color light, the second color light, the third color light and the fourth color light, respectively.
  • the first primary color optical signal R passes through the signal conversion device 511 and becomes a R1 and O1 control signal.
  • the ratio of the gray values of the two the color coordinates of the red light obtained by mixing the first color light and the second color light are determined.
  • the signal parsed by the DVI is (255, 100, 100), and after the signal conversion device 511, the signal is changed.
  • the first control signal R1 and the second control signal O1 are not independent, and the two are associated with each other, and the first color light and the second color light are not separately treated as the primary color light. . If the gray value of the first control signal R1 and the second control signal O1 are changed, the degree of the second color light of the first color light can be changed by the degree of inversion of the DMD, and the red color coordinate obtained by the mixing of the two colors also changes.
  • the corresponding values of the green fluorescence and the blue laser are changed, for example, the signal parsed by the DVI is (255, 100, 100), after the signal conversion device 511, becomes (255, 240, 98, 110), and the like.
  • the first embodiment is different from the first embodiment in that the first color light is green light, the second color light is cyan light, the third color light is red light, and the fourth color light is blue light; the first primary color light signal is For green light, the second primary color light signal is red light, and the third primary color light signal is blue light.
  • the present invention can implement switching between different color gamuts, such as switching between REC.709 and DCI gamut standards, and maintaining the white balance by adjusting the ratio of the three primary colors during the color gamut switching process. Therefore, on the basis of maintaining the ratio of the luminance of the red light, the dynamic switching of the color gamut can be realized at the same time, and high-quality image display can be realized.
  • the light source also emits a fifth color light--cyan light.
  • a cyan laser is selected, and other cyan light may be used.
  • the cyan laser emits immediately after the green fluorescence, and the signal is converted.
  • the portion 511 further converts the second primary color light signal G into a third control signal G1 and a fifth control signal C1; the spatial light modulator 505 acts on the cyan laser incident thereon under the action of the fifth control signal C1 Modulation; the brightness of the mixed green fluorescence and cyan laser is the same as the brightness of the second primary light signal G parsed by the data to be displayed, and the color coordinates of the mixed green and light cyan lasers and the second primary color optical signal resolved by the data to be displayed The color coordinates of G are the same.
  • a cyan laser is added as the second monochromatic illuminating light source, and the color wheel is set to five-stage. As shown in FIG.
  • the five-segment color wheel segments are respectively the first diffuser segment for transmitting the red laser. , orange phosphor powder segment, green phosphor segment, for transmitting cyan laser
  • the red laser still selects a 638 nm red laser
  • the cyan laser selects a 530 nm cyan laser.
  • the blue laser 501 is turned on when the orange phosphor segment, the green phosphor segment or the scattering segment of the color wheel 505 is on the optical axis of the light source
  • the red laser 502 is turned on when the first diffused transparent segment is on the optical axis of the light source.
  • the cyan laser is turned on in the second transparent diffusion segment on the optical axis of the source.
  • the modulation mode of the cyan laser and the green fluorescence is the same as that of the red laser and the orange fluorescence in the first embodiment, and the gray level value of each segment may be adjusted by the control system or the driving current intensity or the duty ratio may be adjusted by the light source driving control portion.
  • changing the ratio of the red laser to the orange fluorescence or changing the ratio of the cyan laser to the green fluorescence, or simultaneously changing the ratio of the red laser to the orange fluorescence, and the ratio of the cyan laser to the green fluorescence can change the color coordinates of the finally emitted red and green light.
  • the color gamut conversion between REC.709 and DCI is implemented as shown in FIG. 15, and in the color gamut conversion process, the ratio between the three primary colors is adjusted to maintain white balance.

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Abstract

一种投影系统，包括光源和控制系统，控制系统将显示的数据解析为基色光信号，信号转换装置将其中一个基色信号转为2个控制信号，该两个控制信号分别控制一种色光在DMD上进行调制，该两个控制信号控制第一色光和第二色光混合后的亮度和色坐标设定的与被解析的该基色光信号一致。本投影系统通过一个基色光信号控制两个在时序上靠近的色光进行时序合光，提高了色光的利用率；对进行时序合光的第一色光和第二色光的亮度和色坐标的设定参照第一基色光的亮度和色坐标，保证了图像质量，另外可以通过设置第一色光和第二色光的之间的亮度比例可以方便的调整色域。尤其是当有多个这样的投影系统拼接显示时可以方便的调整的色域。

Description

一种投影系统及其色域控制方法 技术领域
本发明涉及投影仪领域，更具体的说，涉及一种投影系统及其色域控制方法。
背景技术
目前，DLP投影显示技术在投影显示领域获得广泛应用，其核心部件空间光调制器DMD以其响应速度快的特点，可以用时序切换的基色光来实现彩色投影显示，由此使得单片式DMD投影系统成为一种较为成熟的技术。单片式DMD投影系统以其结构简单，成本较低，在中低端市场广泛应用。在投影系统的光源方面，美国专利US7547114B2提供了一种半导体激光器激发色轮上不同荧光粉色段以形成不同基色光的方法，该方法具有光效高，光学扩展量小的优势，因此发展迅速，成为投影仪光源的理想选择。在现有的激光激发荧光粉光源中，由于产生红光的红光荧光粉或者橙光荧光粉激发效率较低，同时产生的荧光还需配合相应的滤光片滤除短波长光使得红光更纯，这导致最终得到的红光荧光效率很低。因此对于系统而言，红光亮度在总体亮度中所占比例较低，这导致图像质量变差。在实际应用中，不同的场合对于投影系统的色域要求不一样，因此投影系统需要实现不同的色域。当前主要通过DMD的控制程序DDP对色域进行调整，具体来说，是通过CCA(color coordinate adjust)算法对三基色的色坐标进行调整。
现有的DMD投影系统如图1所示：系统包括激光光源101，收集透镜102、104，色轮103，方棒105，光中继系统106，TIR棱镜107，DMD芯片108及其控制装置109，投影镜头110。
激光光源101采用445nm蓝光激光模组，经收集透镜102聚焦后入射到如图2所示的荧光粉色轮103上，色轮分三部分，蓝段涂有散射粉，使得蓝激光消部分相干性后出射，在绿色段和红色段，蓝激光激发荧光粉产生绿色荧光和红色荧光，经过旋转色轮后，产生时序的三基色光，其色域如图3所示。色轮出射的光经过收集透镜104收集后，进入方棒105进行匀光，匀光后经光中继系统106入射到TIR棱镜107处，在TIR棱镜处反射后到达DMD108，经过DMD控制装置109(即DDP)处理后，被调制过的光透射TIR棱镜107，到达投影镜头110，最终成像。DMD控制装置109的工作方式如图4所示，DVI解码出来的RGB图像信号输入到DMD 控制装置DDP，DDP经过CCA算法处理后，输出RGB三基色光信号送入DMD，DMD根据每路信号的灰度值大小进行翻转。CCA算法针对色坐标校正，以红基色光色坐标调整为例，若红光色坐标需要校正，则DDP会控制绿光一部分掺入红光中，从而实现红光的校正。例如视频信号RGB为(255,0,0)，则DDP解析出来的RGB信号为(255,1,0)，诸如此类。在此过程中，由于绿光距离红光的色坐标较远，因此红光校正时并不需要掺入太多的绿光，这对于红光的亮度提升没有帮助，图像质量依然比较差。因此，如何实现一种色域可调，同时又能保证高图像质量的投影系统，成为一项重要的课题。
发明内容
为解决上述问题，本发明提供了一种投影系统，包括光源和控制系统，所述光源提供时序出射的至少四种色光，包括第一色光、第二色光、第三色光和第四色光；所述控制系统包括解码部、信号转换部和空间光调制器；
所述解码部用于将待显示的数据解析为第一基色光信号、第二基色光信号和第三基色光信号；所述信号转换部用于将所述第一基色光信号转换为第一控制信号和第二控制信号，将第二基色光信号转换为第三控制信号，将第三基色光信号转换为第四控制信号；
空间光调制器在所述第一控制信号的作用下对入射在其上的第一色光进行调制，在第二控制信号作用下对入射在其上的第二色光进行调制，在第三控制信号的作用下对入射在其上的第三色光进行调制，在第四控制信号的作用下对入射在其上的第四色光进行调制；
所述第一色光和所述第二色光混合后的亮度与待显示数据解析出来的第一基色光信号亮度相同，所述第一色光和所述第二色光混合后的色坐标与待显示数据析出来的第一基色光信号的色坐标相同。
通过上述描述可知，本发明提供的投影系统通过一个基色光信号控制两个在时序上靠近的色光进行时序合光，提高了色光的利用率；对进行时序合光的第一色光和第二色光的亮度和色坐标的设定参照第一基色光的亮度和色坐标，保证了图像质量，另外可以通过设置第一色光和第二色光的之间的亮度比例可以方便的调整色域。尤其是当有多个这样的投影系统拼接显示时可以方便的调整的色域。
本发明的再一个方面提供了一种投影系统的色域调整方法，所述投影系统包括光源和控制系统，所述光源提供时序出射的至少四种色光，包括第一色光、第二色光、第三色光和第四色光；
所述控制系统包括解码部、信号转换部和空间光调制器，所述解码部用于将待显示的数据解析为第一基色光信号、第二基色光信号和第三基色光信号；所述信号转换部用于将所述第一基色光信号转换为第一控制信号和第二控制信号，将第二基色光信号转换为第三控制信号，将第三基色光信号转换为第四控制信号；
空间光调制器在所述第一控制信号的作用下对入射在其上的第一色光进行调制，在第二控制信号作用下对入射在其上的第二色光进行调制，在第三控制信号的作用下对入射在其上的第三色光进行调制，第四控制信号的作用下对入射在其上的第四色光进行调制；
所述第一色光和所述第二色光混合后的亮度与待显示数据解析出来的第一基色光信号亮度相同，所述第一色光和所述第二色光混合后的色坐标与待显示数据析出来的第一基色光信号的色坐标相同。
本控制方法控制第一色光和第二色光的混合后的色坐标与第一基色信号相同，第一与第二色光混合后的色坐标与第一基色光的信号也相同，通过调整第一色光和第二色光之间的比例就可以方便的控制投影系统的色域，可以使的投影系统适应与不同的显示标准要求。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。
图1为现有投影系统图；
图2为现有投影系统中色轮结构图；
图3为现有投影系统的色域图；
图4为现有DMD控制装置的工作方式图；
图5为本发明实施例1的投影系统图；
图6为本发明实施例1投影系统的色轮结构图；
图7为本发明实施例1投影系统的控制系统图。
图8为本发明实施例1控制信号控制DMD调制色光时序图；
图9为本发明实施例1各色光对应的驱动电流强度图；
图10为本发明实施例1色域图；
图11为本发明实施1各色光对应的驱动电流占空比示意图；
图12为本发明实施例1第一控制信号与第二控制信号值相同时的控制系统图；
图13为本发明实施例2信号转换外置时的控制系统图；
图14为本发明实施例4投影系统的色轮结构图。
图15为本发明实施例4色域图；
具体实施方式
下面将结合本发明实施例中的附图，对本发明的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。对于本发明投影系统色域的控制方法在实施方式中结合投影系统的进行阐述，为节省篇幅不再另行说明。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例1
为解决现有技术中提出的问题，本发明提供了的投影显示系统或者投影系统的色域控制方法，包括光源和控制系统，光源能够时序出射至少四种色光，例如可以是发射不同颜色的光源分时发光形成时序色光，优选选用常见的固态光源激光器或LED，或选用旋转的色轮来发射时序光。本发明中的光源包括激发光源、单色发光光源和色轮505，激发光源为发射445nm蓝光的激光器或激光器模组501，单色发光光源为发射638nm红光的红光激光器或者红光激光器模组502。色轮为四段式，用于出射第一色光、第二色光、第三色光和第四色光，具体的第一色光为红光激光器或者红光激光器模组502产生的红光(为便于理解，下文称为红激光)、第二色光为445nm蓝激光激发色轮505上橙色荧光粉段产生的橙光(为便于理解，下文称为橙荧光)、第三色光为绿光和第四色光为蓝光。该四段式色轮的透明diffuser段出射红激光、橙光荧光粉段出射橙荧光、绿光荧光粉段出射绿荧光，散射段出射蓝光。在本方案中第三色光绿光和第四色光蓝光也可以由绿光发光元件例如绿激光器或者蓝激光器提供。
图5示出了本实施方式投影系统的具体结构，包括用作激发光源的445nm蓝光激光器501、用作单色发光光源的红光激光器502、二向色镜503，收集透镜504和506，色轮505，方棒507，光中继系统508，TIR棱镜509，DMD芯片510和信号转换部511，投影镜头512。激发光源501发出的蓝激光与红色激光器502发出的红激光在二向色镜503处合光，二向 色镜透射蓝光反射红光，合光后的光束经收集透镜504聚焦到色轮505上，红光激光器也可以放在色轮之后与经过色轮的光进行合光，本实施方式出于举例，其他合光位置与合光方式在此不再一一列举。色轮505为如图6所示的四段式色轮，其中蓝光激光器501在色轮的橙色荧光粉段、绿色荧光粉段或散射段处于光源光轴上时开启，蓝激光激发绿光荧光粉段和橙光荧光粉段产生绿荧光与橙荧光后透射；在散射段蓝激光经散射后透射。在透射diffuser段(也就是透明diffuer段)蓝光激器501关闭，红光激光器502打开，红激光经准直透镜504聚焦到diffuser段后透射。色轮505出射的时序光经收集透镜506后进入方棒507，匀光后经光中继系统508到达TIR棱镜509处，反射后到达DMD芯片510，在信号转换部511转换的信号控制下，DMD芯片510对入射光进行调制，经调制后的光透射TIR棱镜509，最终经投影镜头512成像。本实施方式中的色轮也可以采用全反射式结构，只要能够提供时序出射的至少四种色光即可。本实施方式中的色轮仅作为一种优选方式举例说明书本方案，如前所述，色轮也可以只包含橙色荧光粉用于提供橙荧光，其他色光可以由发光元件提供。
控制系统包括解码部、信号转换部和空间光调制器，如图7或图8所示，解码部将待显示的数据解析为第一基色光信号R、第二基色光信号G和第三基色光信号B；信号转换部511为DMD的控制单元DDP，本实施方式通过修改DMD的控制单元DDP的程序，使其具有信号转换功能。修改后的DDP其将所述第一基色光信号R转换为第一控制信号R1和第二控制信号R1或R2，将第二基色光信号G转换为第三控制信号G1，将第三基色光信号B转换为第四控制信号B1；空间光调制器为数字微镜DMD，其在所述第一控制信号R1的作用下对入射在其上的第一色光红激光进行调制，在第二控制信号R2作用下对入射在其上的第二色光橙荧光进行调制，在第三控制信号G1的作用下对入射在其上的第三色光绿荧光进行调制，在第四控制信号B1的作用下对入射在其上的第四色光蓝激光进行调制。上述的四色光不局限于激光，也可以是LED产生的光。在DMD对时序色光进行调制时，将第一色光红激光和所述第二色光橙荧光混合后的亮度与待显示数据解析出来的第一基色光信号R亮度设为相同，所述第一色光红激光和所述第二色光橙荧光混合后的色坐标与待显示数据析出来的第一基色光信号R的色坐标设为相同，保证显示的图像质量。
待显示数据被DVI解码为第一基色光信号R、第二基色光信号G和第三基色光信号B，上述基色光信号经DDP处理转换为R1、R2、G1、B1四个控制信号，相当于第一基色光信号R在时序上重复了一下，此时，DMD上实际入射的光与DMD处理的信号如图8所示，即在R1和R2控制信号的时间内，DMD实际上分别处理了红激光R和橙荧光O。具体来说， 如图12所示，假设第一基色光信号R灰度值为a(0≤a≤255)，经信号转换部DDP处理后灰度值变为b和c(0≤b,c≤255)，则两段时序混合后，实际出射的红光亮度为a/255·LR’(LR’为红激光器最大亮度)，色坐标为(x,y)，实际出射的亮度是指人眼接收到的实际亮度，也即是灰阶亮度，例如a/255·LR’；假设红激器发射的红激光亮度为b/255·LR(LR为红激光器的最大亮度)，色坐标为(xR,yR)，激发橙色荧光粉产生的橙荧光亮度为c/255·LO(LO为橙色荧光最大亮度)，色坐标为(xO,yO)，则以上各参量满足以下关系式：
Figure PCTCN2016078540-appb-000001
Figure PCTCN2016078540-appb-000002
Figure PCTCN2016078540-appb-000003
即第一基色光信号的灰度值a被转换为灰度值为b的第一控制信号和灰度值为c的第二控制信号，改变第一控制信号灰度值b和第二控制信号灰度值c，通过控制DMD的翻转程度可以改变红激光和橙荧光之间的比例，从而改变红激光和橙荧光混合后红光的色坐标，与此同时，对应的绿荧光和经散射的蓝光的灰度值也需要进行改变，配合混合后红光保持白平衡。以上信号转换都是通过控制系统的信号转换部511，具体的说，是通过修改后的DDP直接实现的。
为了便于理解，第一基色光信号的灰度值a被信号转换部511转换后的第一控制信号和第二控制信号的灰度值都设为a，假设第一基色光信号R信号灰度值为a(0≤a≤255)，经DDP转换后，第一和第二控制信号的灰度值都为a,灰度值都为a的第一控制信号控制红激光和第二控制信号控制第二基色光即橙荧光在空间光调制器上进行调制，红激光和橙荧光在时序上混合后，实际出射的红光亮度为a/255·LR’(LR’为红光的最大亮度)，色坐标为(x,y)，假设红光激光R光亮度为a/255·LR(LR为红激光最大的亮度)，色坐标为(xR,yR)，橙光O光亮度为a/255·LO(LO为橙色荧光最大的亮度)，色坐标为(xO,yO)，则以上各参量满足以下关系式：
LR'＝LR+LO
Figure PCTCN2016078540-appb-000004
Figure PCTCN2016078540-appb-000005
采用以上方式实现了红光激光与橙色荧光的时序合光，二者混合得到系统所需的红光，亮度为LR’，色坐标为(x,y)。由于红光是由两种光混合得到的，若两种光的比例发生变化，则混合后得到的红光色坐标也会发生相应的变化。
控制系统还包括光源驱动控制部，所述光源驱动控制部通过控制第一色光和第二色光的驱动电流强度或电流占空比调配第一色光和第二色光的亮度比例。光源驱动控制部还控制第三色光或者第四色光的驱动电流强度或者占空比，使待显示数据达到预定的白平衡；或，所述信号转换部还配置第三色光或者第四色光的灰度值，使待显示数据达到预定的白平衡，白平衡指的是各种色光混合到一起以后得到的白光的色坐标满足一定标准的要求，例如REC.709对白光的要求(0.31,0.33)，DCI标准对白光的要求(0.314,0.351)。
在上述描述中，红激光亮度LR与橙色荧光亮度LO是由其驱动电流大小决定的，因此，通过控制系统的光源驱动控制部改变红激光器和激发光光源对应的驱动电流，即可改变红激光亮度LR与橙荧光LO对应的亮度，从而改变最终得到的红光色坐标，如图9所示，减小橙荧光段对应的激发光源的驱动电流强度，提高红激光段红激光器驱动电流的强度，可提高红激光在二者中的比例，从而使得混合后的红光坐标向更红的方向扩展，如图10所示。同时，为了保证色域改变后白平衡不变，需要对应的调节散射蓝光和绿荧光对应的激发光源驱动电流强度。
优选的，如图11所示，光源驱动部控制部采用PWM驱动电流调制方式，通过改变各段驱动电流的占空比，调节电流激发强度，从而改变各段的亮度，在改变红光色坐标的同时，保持白平衡。
实施例2
本实施方式与上述实施方式的不同之处在于，信号转换部511不同于DDP，为外置的信号转换的装置，在上述实施例中，在DMD控制程序DDP方面，需要修改其本征程序与实施例中的色轮、光时序相对应，本实施例不修改DDP本征程序，采用外部信号转换装置511， 例如FPGA，如图13所示。将DVI解析出来的第一基色光信号R、第二基色光信号G和第三基色光信号B经过信号转换装置511后，变为第一控制信号R1、第二控制信号O1，第三控制信号G1和第四控制信号B1，DDP设置成四段式，分别为R1、O1、G1和B1段，控制DMD分别处理第一色光、第二色光、第三色光和第四色光。具体来说，DVI解析出来的第一基色光信号R、第二基色光信号G和第三基色光信号B中，第一基色光信号R经过信号转换装置511后，变为R1与O1控制信号，其依据为二者的灰度值比例决定了第一色光与第二色光混合后得到的红光的色坐标，例如DVI解析出的信号为(255,100,100)，经过信号转换装置511后，变为(255，255,100,100)，也即是说，第一控制信号R1与第二控制信号O1不是独立的，二者相互关联，第一色光与第二色光不会被单独的当做基色光来处理。若改变第一控制信号R1与第二控制信号O1的灰度值，通过DMD的翻转翻转程度可改变第一色光第二色光的比例，二者混合后得到的红光色坐标也会改变，与此同时，为了保证白平衡，对应的改变绿荧光与蓝激光的值，例如DVI解析出来的信号为(255,100,100)，经过信号转换装置511后，变为(255，240,98,110)，诸如此类。
实施例3
本实施方式与实施例1的不同之处在于，第一色光为绿光，第二色光为青绿光，第三色光为红光，所述第四色光为蓝光；所述第一基色光信号为绿光，所述第二基色光信号为红光，所述第三基色光信号为蓝光。通过调节绿荧光与青绿激光的比例，得到不同的绿光色坐标，实现不同的色域。由此，本发明可实现不同色域之间的切换，例如REC.709与DCI色域标准的切换，并且在色域切换过程中，通过调节三基色的比例，保持白平衡不变，其好处在于，在保持红光亮度比例的基础上，同时实现色域的动态切换，能够实现高质量的图像显示。
实施例4
在实施例1的基础上所述光源还出射第五色光--青绿光，本实施方式中选用青绿激光，也可以是其他青绿光，该青绿激光紧接绿荧光时序出射，所述信号转换部511还将所述第二基色光信号G转换为第三控制信号G1和第五控制信号C1；空间光调制器505在所述第五控制信号C1的作用下对入射在其上的青绿激光进行调制；绿荧光和青绿激光混合后的亮度与待显示数据解析出来的第二基色光信号G亮度相同，绿荧光和光青绿激光混合后的色坐标与待显示数据解析出来的第二基色光信号G的色坐标相同。本实施方式添加青绿激光作为第二单色发光光源，同时将色轮设为五段式，如图14所示，五段式色轮各段依次分别为用于透射红激光的第一diffuser段、橙荧光粉段、绿荧光粉段、用于透射青绿激光 的第二段diffuser段和散射蓝激光的蓝光散射段。如实施例1中激光器，本实施方式中红激光器依然选择638nm红激光器，青绿激光选用530nm青绿激光器。蓝光激光器501在所述色轮505的橙色荧光粉段、绿色荧光粉段或散射段处于光源光轴上时开启；红光激光器502在所述第一扩散透明段处于光源光轴上时开启，所述青绿光激光器在所述第二透明扩散段处于光源光轴上开启。
青绿激光与绿荧光的调节方式同实施例1中的红激光与橙荧光的调制方式，可以是通过控制系统调节各段灰度值或者通过光源驱动控制部调节驱动电流强度或者占空比。上述方式中改变红激光与橙荧光或改变青绿激光与绿荧光的比例，或者同时改变红激光与橙荧光比例、青绿激光与绿荧光的比例，可以改变最终出射的红光与绿光的色坐标，从而达到不同的色域，如图15所示实现REC.709与DCI之间的色域变换，并且在色域变换过程中，调节三基色光之间的比例，保持白平衡。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (30)

  1. 一种投影系统，包括光源和控制系统，其特征在于，所述光源提供时序出射的至少四种色光，包括第一色光、第二色光、第三色光和第四色光；所述控制系统包括解码部、信号转换部和空间光调制器；
    所述解码部用于将待显示的数据解析为第一基色光信号、第二基色光信号和第三基色光信号；所述信号转换部用于将所述第一基色光信号转换为第一控制信号和第二控制信号，将第二基色光信号转换为第三控制信号，将第三基色光信号转换为第四控制信号；
    空间光调制器在所述第一控制信号的作用下对入射在其上的第一色光进行调制，在第二控制信号作用下对入射在其上的第二色光进行调制，在第三控制信号的作用下对入射在其上的第三色光进行调制，在第四控制信号的作用下对入射在其上的第四色光进行调制；
    所述第一色光和所述第二色光混合后的亮度与待显示数据解析出来的第一基色光信号亮度相同，所述第一色光和所述第二色光混合后的色坐标与待显示数据析出来的第一基色光信号的色坐标相同；
    所述控制系统还包括光源驱动控制部，所述光源驱动控制部通过控制第一色光和第二色光的驱动电流强度或电流占空比调配第一色光和第二色光的亮度比例。
  2. 根据权利要求1所述的投影系统，其特征在于，通过所述信号转换部，将所述第一基色光信号的灰度值配置为a、将所述第一控制信号灰度值配置为b以及将所述第二控制信号灰度值配置为c，所述第一色光和所述第二色光的混合光与所述第一基色光信号在亮度和色坐标上满足如下关系：
    Figure PCTCN2016078540-appb-100001
    Figure PCTCN2016078540-appb-100002
    Figure PCTCN2016078540-appb-100003
    其中LR'为第一基色光信号的最大亮度，LR为第一色光的最大亮度，LO为第二色光的最大亮度，第一基色光信号的色坐标为(x,y)，第一色光色坐标为(xR,yR)，第二色光色坐标为(xO,yO)。
  3. 根据权利要求2所述的投影系统，其特征在于，通过所述信号转换部将所述第一基色光信号的灰度值、所述第一控制信号灰度值和第二控制信号灰度值配置为同一值a，所述第一色光和所述第二色光的混合光与所述第一基色光信号在亮度和色坐标上满足如下关系：
    LR'＝LR+LO
    Figure PCTCN2016078540-appb-100004
    Figure PCTCN2016078540-appb-100005
    其中LR'为第一基色光信号的最大亮度，LR为第一色光的最大亮度，LO为第二色光的最大亮度，第一基色光信号的色坐标为(x,y)，第一色光色坐标为(xR,yR)，第二色光色坐标为(xO,yO)。
  4. 根据权利要求1所述投影系统，其特征在于，所述光源驱动控制部还控制第三色光或者第四色光的驱动电流强度或者占空比，使待显示数据达到预定的白平衡；或，所述信号转换部还配置第三控制信号的灰度值调整第三色光亮度和配置第四控制信号的灰度值调整第四色光的亮度，使待显示数据达到预定的白平衡。
  5. 根据权利要求1所述投影系统，其特征在于，所述信号转换部为所述空间光调制器的控制系统DDP或者为独立于所述空间光调制器的信号转换装置。
  6. 根据权利要求1所述投影系统，其特征在于，所述第一色光为红光，所述第二色光为橙光，所述第三色光为绿光，所述第四色光为蓝光；所述第一基色光信号为红光，所述第二基色光信号为绿光，所述第三基色光信号为蓝光。
  7. 根据权利要求1所述投影系统，其特征在于，所述第一色光为绿光，所述第二色光为青绿光，所述第三色光为红光，所述第四色光为蓝光；所述第一基色光信号为绿光，所述第二基色光信号为红光，所述第三基色光信号为蓝光。
  8. 根据权利要求1至7任一项所述投影系统，其特征在于，所述光源包括激发光源、第一单色发光光源和置于所述光源光轴上的可旋转色轮，所述色轮包括依次设置的透明扩散段、橙色荧光粉段、绿色荧光粉段和散射段。
  9. 根据权利要求8所述投影系统，其特征在于，所述激发光源为蓝光激光器，所述第一单色发光光源为红光激光器，所述蓝光激光器在所述色轮的橙色荧光粉段、绿色荧光粉段或散射段处于光源光轴上时开启；所述红光激光器在所述扩散透明段处于光源光轴上时开启。
  10. 根据权利要求9所述投影系统，其特征在于，所述蓝光激光器发出的蓝色激光主波长为445nm，所述红激光器发出的红激光的主波长为638nm。
  11. 根据权利要求1所述投影系统，其特征在于，所述光源还出射第五色光，所述第五色光紧接第三色光时序出射，所述信号转换部还将所述第二基色光信号转换为第三控制信号和第五控制信号；空间光调制器在所述第五控制信号的作用下对入射在其上的第五色光进行调制；其特征在于，所述第三色光和所述第五色光混合后的亮度与待显示数据解析出来的第二基色光信号亮度相同，所述第三色光和所述第五色光混合后的色坐标与待显示数据解析出来的第二基色光信号的色坐标相同。
  12. 根据权利要求11所述投影系统，其特征在于，所述第一色光为红光，所述第二色光为橙光，所述第三色光为绿光，所述第四色光为蓝光，第五色光为青绿光；所述第一基色光信号为红光，所述第二基色光信号为绿光，所述第三基色光信号为蓝光。
  13. 根据权利要求1、11或12所述投影系统，其特征在于，所述光源包括激发光源、第一单色发光光源、第二单色发光光源和置于所述光源光轴上的可旋转色轮，所述色轮包括依次设置的第一透明扩散段、橙色荧光粉段、绿色荧光粉段、第二透明扩散段和散射段。
  14. 根据权利要求13所述的投影系统，其特征在于，所述激发光源为蓝光激光器，所述第一单色发光光源为红光激光器，所述第二单色发光元件为青绿光激光器；所述蓝光激光器在所述色轮的橙色荧光粉段、绿色荧光粉段或散射段处于光源光轴上时开启；所述红光激光器在所述第一扩散透明段处于光源光轴上时开启，所述青绿光激光器在所述第二透明扩散段处于光源光轴上开启。
  15. 根据权利要求14所述投影系统，其特征在于，所述蓝光激光器发出的蓝色激光主波长为445nm，所述红光激光器发出的红激光的主波长为638nm，所述青绿光激光器发出的青绿激光的主波长为530nm。
  16. 一种投影系统的色域控制方法，其特征在于，所述投影系统包括光源和控制系统，所述光源提供时序出射的至少四种色光，包括第一色光、第二色光、第三色光和第四色光；
    所述控制系统包括解码部、信号转换部和空间光调制器，所述解码部用于将待显示的数据解析为第一基色光信号、第二基色光信号和第三基色光信号；所述信号转换部用于将 所述第一基色光信号转换为第一控制信号和第二控制信号，将第二基色光信号转换为第三控制信号，将第三基色光信号转换为第四控制信号；
    空间光调制器在所述第一控制信号的作用下对入射在其上的第一色光进行调制，在第二控制信号作用下对入射在其上的第二色光进行调制，在第三控制信号的作用下对入射在其上的第三色光进行调制，第四控制信号的作用下对入射在其上的第四色光进行调制；
    所述第一色光和所述第二色光混合后的亮度与待显示数据解析出来的第一基色光信号亮度相同，所述第一色光和所述第二色光混合后的色坐标与待显示数据析出来的第一基色光信号的色坐标相同；
    所述控制系统还包括光源驱动控制部，所述光源驱动控制部通过控制第一色光和第二色光的驱动电流强度或电流占空比调配第一色光和第二色光的亮度比例。
  17. 根据权利要求16所述的投影系统的色域控制方法，其特征在于，通过所述信号转换部，将所述第一基色光信号的灰度值配置为a、将所述第一控制信号灰度值配置为b以及将所述第二控制信号灰度值配置为c，所述第一色光和所述第二色光的混合光与所述第一基色光信号在亮度和色坐标上满足如下关系：
    Figure PCTCN2016078540-appb-100006
    Figure PCTCN2016078540-appb-100007
    Figure PCTCN2016078540-appb-100008
    其中LR'为第一基色光信号的最大亮度，LR为第一色光的最大亮度，LO为第二色光的最大亮度，第一基色光信号的色坐标为(x,y)，第一色光色坐标为(xR,yR)，第二色光色坐标为(xO,yO)。
  18. 根据权利要求17所述的投影系统的色域控制方法，其特征在于，通过所述信号转换部将所述第一基色光信号的灰度值、所述第一控制信号灰度值和第二控制信号灰度值配置为同一值a，所述第一色光和所述第二色光的混合光与所述第一基色光信号在亮度和色坐标上满足如下关系：
    LR'＝LR+LO
    Figure PCTCN2016078540-appb-100009
    Figure PCTCN2016078540-appb-100010
    其中LR'为第一基色光信号的最大亮度，LR为第一色光的最大亮度，LO为第二色光的最大亮度，第一基色光信号的色坐标为(x,y)，第一色光色坐标为(xR,yR)，第二色光色坐标为(xO,yO)。
  19. 根据权利要求16所述投影系统的色域控制方法，其特征在于，所述光源驱动控制部还控制第三色光或者第四色光的驱动电流强度或者占空比，使待显示数据达到预定的白平衡；或，所述信号转换部还配置第三控制信号的灰度值调整第三色光亮度和配置第四控制信号的灰度值调整第四色光的亮度，使待显示数据达到预定的白平衡。
  20. 根据权利要求16所述投影系统的色域控制方法，其特征在于，所述信号转换部为所述空间光调制器的控制系统DDP或者为独立于所述空间光调制器的信号转换装置。
  21. 根据权利要求16所述投影系统的色域控制方法，其特征在于，所述第一色光为红光，所述第二色光为橙光，所述第三色光为绿光，所述第四色光为蓝光；所述第一基色光信号为红光，所述第二基色光信号为绿光，所述第三基色光信号为蓝光。
  22. 根据权利要求16所述投影系统的色域控制方法，其特征在于，所述第一色光为绿光，所述第二色光为青绿光，所述第三色光为红光，所述第四色光为蓝光；所述第一基色光信号为绿光，所述第二基色光信号为红光，所述第三基色光信号为蓝光。
  23. 根据权利要求16至22任一项所述投影系统的色域控制方法，其特征在于，所述光源包括激发光源、第一单色发光光源和置于所述光源光轴上的可旋转色轮，所述色轮包括依次设置的透明扩散段、橙色荧光粉段、绿色荧光粉段和散射段。
  24. 根据权利要求23所述投影系统的色域控制方法，其特征在于，所述激发光源为蓝光激光器，所述第一单色发光光源为红光激光器，所述蓝光激光器在所述色轮的橙色荧光粉段、绿色荧光粉段或散射段处于光源光轴上时开启；所述红光激光器在所述扩散透明段处于光源光轴上时开启。
  25. 根据权利要求24所述投影系统的色域控制方法，其特征在于，所述蓝光激光器发出的蓝色激光主波长为445nm，所述红激光器发出的红激光的主波长为638nm。
  26. 根据权利要求16所述投影系统的色域控制方法，其特征在于，所述光源还出射第五色光，所述第五色光紧接第三色光时序出射，所述信号转换部还将所述第二基色光信号转换为第三控制信号和第五控制信号；空间光调制器在所述第五控制信号的作用下对入射在其上的第五色光进行调制；其特征在于，所述第三色光和所述第五色光混合后的亮度与待显示数据解析出来的第二基色光信号亮度相同，所述第三色光和所述第五色光混合后的色坐标与待显示数据解析出来的第二基色光信号的色坐标相同。
  27. 根据权利要求26所述投影系统的色域控制方法，其特征在于，所述第一色光为红光，所述第二色光为橙光，所述第三色光为绿光，所述第四色光为蓝光，第五色光为青绿光；所述第一基色光信号为红光，所述第二基色光信号为绿光，所述第三基色光信号为蓝光。
  28. 根据权利要求16、26或27所述投影系统的色域控制方法，其特征在于，所述光源包括激发光源、第一单色发光光源、第二单色发光光源和置于所述光源光轴上的可旋转色轮，所述色轮包括依次设置的第一透明扩散段、橙色荧光粉段、绿色荧光粉段、第二透明扩散段和散射段。
  29. 根据权利要求28所述的投影系统的色域控制方法，其特征在于，所述激发光源为蓝光激光器，所述第一单色发光光源为红光激光器，所述第二单色发光元件为青绿光激光器；所述蓝光激光器在所述色轮的橙色荧光粉段、绿色荧光粉段或散射段处于光源光轴上时开启；所述红光激光器在所述第一扩散透明段处于光源光轴上时开启，所述青绿光激光器在所述第二透明扩散段或所述橙色荧光粉处于光源光轴上开启。
  30. 根据权利要求29所述投影系统的色域控制方法，其特征在于，所述蓝光激光器发出的蓝色激光主波长为445nm，所述红光激光器发出的红激光的主波长为638nm，所述青绿光激光器发出的青绿激光的主波长为530nm。
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