WO2011123986A1

WO2011123986A1 - Protection method and apparatus for color modulation apparatus of projection system

Info

Publication number: WO2011123986A1
Application number: PCT/CN2010/000465
Authority: WO
Inventors: 李屹; 陈泉泉
Original assignee: 绎立锐光科技开发(深圳)有限公司
Priority date: 2010-04-09
Filing date: 2010-04-09
Publication date: 2011-10-13

Abstract

A protection apparatus for the color modulation apparatus of a projection system comprises a control unit and a positioning unit which is located on the color modulation device. The positioning unit provides the control unit reference signals changing with the movement of the color modulation device. The control unit outputs control signals to the power switch of a light radiation source. The invention also provides a protection method for the color modulation device of a projection system. The method includes: supplying electric power to the light radiation source; controlling the movement of the color modulation device located in the optical channel of the light radiation source; monitoring the movement of the color modulation device, in order to cut off the supply power of the light radiation source when the velocity of the movement is less than or equal to a reserve value.

Description

Method and device for protecting color grading device of projection system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control or adjustment techniques for high power light sources, and more particularly to protection of tinting devices, such as color wheels or phosphors.

BACKGROUND OF THE INVENTION A typical projection display system includes a light source system that includes a plurality of monochromatic light sources, such as, but not limited to, a red light source, a green light source, and a blue light source to generate red (R), green (G), and blue light, respectively ( B) Beam. The projection display system further includes a light valve for modulating the red, green, and blue light beams to produce a color image, and for projecting the red, green, and blue light beams modulated by the aperture to the screen to generate an image. Light projection lens. The red, green, and blue light beams may be, but are not limited to, conducted to the color combining prism through the optical fiber, and are concentrated and sent to the light valve. The light valve may be a micro-electro-mechanical system (MEMS) device such as a light modulator based on Texas Instruments' DLP (Digital Light Process) technology. The image signal processor of the projection display system controls the light sources by driving signals and outputs corresponding image data to the light modulator. For example, when the red light source is turned on and emits red light, the image signal processor will send the red image data to the light modulator (eg, digital micromirror device, DMD); similarly, when the green or blue light source is turned on and emitted In the case of green/blue light, the image signal processor will send the corresponding green/blue image data to the light modulator. If all red, green and blue light sources are turned on, the gray image data will be sent to the light modulator. Wherein, the light source system can also provide a feedback signal to the image signal processor, together with the drive signal to form a feedback loop for stabilizing the chromaticity and brightness of the light source. The modulated image beam is finally projected onto the display screen via the light projection lens. In order to save cost, the existing light source system uses UHP (Ultra High Performance) lamps as a light source to generate white light; and then passes through a color concentrating device, such as a segmented color wheel, to transmit red, green, blue, etc. required for display. Shade. The shortcomings of this scheme are: UHP lamp startup requires a high starting voltage, often up to several thousand volts; and UHP lamp startup and shutdown waiting time is longer; the color effect of each monochromatic light produced by this scheme is relatively poor The gamut is small. With the development of LED (Light Emi tt ing Diode) technology, LED systems are increasingly using LEDs to overcome these shortcomings.

Confirmation According to the way of generating monochromatic light, the existing light source system can be divided into the following types (for the convenience of description, the light source is

LED as an example):

1) Different colors of LEDs are used to generate various monochromatic beams, such as red, green, blue, and yellow beams. This method shows good results and a wide gamut range, but the LED cost is high.

2) Monochromatic LEDs and tinting devices are used to produce a variety of monochromatic beams. The most common color grading device is a segmented color wheel. As shown in Fig. 1, the color wheel 20 is placed in the outgoing light path of the LBD 10, so that the light is transmitted in a transmissive manner through the rotating color wheel to generate monochromatic light corresponding to the color of each segment.

3) A monochromatic LED and a color grading device with a light wavelength conversion material are used to generate various monochromatic beams. The faint wavelength conversion material includes a phosphor. Pigmenting is usually applied in sections between the double glazing of the color wheel to achieve segmented toning. The glass itself can withstand high temperatures, and the temperature limit that the phosphor can withstand is generally 100 to 20 (TC. Under the illumination of the LED, the fluorescence of each segment can be obtained by the rotation of the color wheel. The corresponding monochromatic excited light of the powder. For example, the three-color projection display system is usually based on the blue LED to generate the red, green, and blue monochromatic light required for display. Sometimes, in order to improve the excitation efficiency of the phosphor, the blue LED plus ultraviolet light is used. The LBD is used to jointly excite the phosphor. The disadvantages of the prior art described above are: As the power requirements of the field system for the light source system become larger and larger, various high-power light sources are constantly emerging, so that the color concentrating device in the light source system receives Increasingly large light energy. When the color grading device (such as the color wheel) is shown at high speed, these light energy will not accumulate in a fixed segment per unit time. However, if an accident occurs, for example, the optomechanical system appears. For reasons such as malfunctions, when the color wheel suddenly stops or the rotation speed is significantly reduced, the light energy per unit time will cause the color wheel to burn or cause the coating due to local accumulation of excessive heat. The optical wavelength conversion material is permanently disabled. There is another possibility: the color wheel should also be started after the projector is started normally; but if the accidental color wheel does not start, the system will still be in the normal order. Starting the LED light source will also damage the color wheel or phosphor performance in a short period of time.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to address the deficiencies of the prior art described above, and to provide a protection method and apparatus for a projection display system, which can protect the color grading device from high power light irradiation or destruction. In order to solve the above technical problems, the basic idea of the present invention is: if a device is provided to monitor the movement of the color grading device in real time, such as the rotation speed of the color wheel, when the rotation speed is found to be low enough to jeopardize the efficacy of the phosphor or the color wheel trait, the cutting is quickly cut off. hair The power supply of the light source can achieve the purpose of protecting the color wheel or phosphor. Specifically, when the projection system is started up and during the normal operation of the projection system, if the color wheel rotation speed is lower than a preset value, the power supply is not turned on; when monitoring or re-monitoring that the rotation speed returns to normal The power supply is turned on to facilitate the safe operation of the projection system. As a technical solution for realizing the inventive concept, a method for protecting a color grading device for a light source system includes:

a step of supplying power to the light source of the light source system; outputting light from the light source through an optical channel; controlling a step of moving a color grading device disposed on the light path; the color grading device comprising different optical At least two regions of the characteristic, the movement of the color grading device causes each of the regions to be continuously rotated into the optical channel; in particular, the method further comprises the steps of:

Monitoring the movement of the color grading device, when it is detected that the speed of the motion is small or equal to a predetermined value, turning off the power supply to the illuminating source; otherwise, starting or maintaining the power supply to the illuminating source. In the above solution, the light source system first starts the step of monitoring the movement of the color grading device to control the step of performing power supply to the illuminating source. The color wheel and phosphor can be protected from the start of the light source. In the above solution, once the light source system is powered on, the step of monitoring the movement of the color grading device is always performed. It is convenient to resume the work of the light source system immediately after the malfunction of the color grading device. The color grading device is a sports disk. In the above solution, the different optical characteristics refer to different transmission or reflection characteristics of the region to the same incident light; or when the optical wavelength conversion material is carried on one of the regions, the pair is the same Different light wavelength conversion characteristics of incident light. In the above solution, the optical wavelength converting material is carried on the region in the form of coating, filling or filming. In the above solution, when monitoring the movement of the color grading device, a positioning device is disposed on the color grading device for providing a reference signal for evaluating the moving speed of the color grading device to the light source system. The unit performs the monitoring. The positioning device is included in a servo device of the color grading device, and the reference signal is an angle or position related signal output by the servo device. Or the positioning device is a protrusion mounted on the edge of the color grading device, the movement of the color grading device causing the protrusion to periodically trigger an optical or electromechanical detection signal for use as the reference signal. In the above solution, the control unit estimates the moving speed of the coloring device according to the pulse width of the reference signal. Or, the moving speed of the color grading device is evaluated based on the number of pulses of the reference signal per unit time. As a technical solution for realizing the concept of the present invention, there is still provided a protection device for a packet conditioning device, which is used in a light source system, the light source system includes a light source and a color device, and light from the light source is projected to the light through an optical channel a color grading device; the color grading device includes at least two regions having different optical characteristics, each of the regions will be continuously rotated into a projection range of the light channel when the color grading device is in a moving state; in particular, The protection device comprises a control unit and a positioning device disposed on the color grading device; the positioning device provides a reference signal that changes with the movement of the color grading device to the control unit; the control unit outputs a control A signal is applied to the power switch of the illumination source. In the above solution, the control unit is further connected to an output end of the temperature sensor; the temperature sensor senses an environmental temperature change of the heat sink from the light source to output a corresponding temperature control signal. In the above solution, the color grading device is a moving disk having at least two regions having different light transmission characteristics; or at least two regions having different light wavelength conversion characteristics, wherein at least one region carries the light wavelength conversion material. . As a technical solution for realizing the inventive concept, there is still provided a projection system including a light source system, the light source system including a light source and a color concentrating device, and light from the light source is projected to the color grading device through an optical channel; The color grading device includes at least three regions having different optical characteristics, each of the regions will be continuously rotated into a projection range of the optical channel when the color grading device is in a motion state, so that the light source system provides red light, a plurality of monochromatic beams of green light and blue light; the projection system further comprising a light valve for modulating the red, green, and blue light beams to produce a color image, and for projecting red light modulated by the light valve a green, blue light beam to the screen to produce an image of the light projection lens; the projection system further comprising an image signal processor, the image signal processor controls the light output of the light source system by the driving signal, and outputs corresponding image data to the light a valve; in particular, the projection system further includes a control unit and a positioning device disposed on the color grading device; The positioning device provides a reference signal that varies with the movement of the color grading device to the control unit; the control unit outputs a control signal to the power switch of the illumination source. In the above solution, the control unit is further connected to an output end of the temperature sensor; the temperature sensor senses an environmental temperature change of the heat sink from the light source and outputs a corresponding temperature control signal. In the above solution, when the control unit detects that the ambient temperature or temperature change represented by the temperature control signal exceeds a predetermined warning value, a control signal for causing the system to generate an alarm is given. In the above aspect, the color grading device includes a color wheel having at least three regions respectively having different light transmission characteristics corresponding to the red, green, and blue light phases; or including having the red light and the green light Corresponding to the blue light A color wheel of at least three regions of the same wavelength conversion characteristic, the color wheel carrying at least two optical wavelength conversion materials distributed in different regions. By using the above various technical solutions, the color grading device can be protected, and at the same time, the realization cost is low. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the optical path structure of a light source system;

2 is a schematic structural view of a light source system of the present invention taking a turntable as an example;

3 is a schematic view showing an alternative embodiment of the optical path structure of the light source system of the present invention;

4 is a second schematic view showing an alternative embodiment of the optical path structure of the light source system of the present invention;

Figure 5 is a third schematic view showing an alternative embodiment of the optical path structure of the light source system of the present invention;

Figure 6 is a schematic structural view of a projection system of the present invention;

Wherein, each reference numeral is: 10—one illuminating source, 11—excitation ray, and 1 Γ 激发激发激发激发激发激发;

20 one coloring device / color wheel, 21 - positioning device; 30 - a lens; 41, 42 - a light detector. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be further described with reference to the preferred embodiments shown in the drawings. The prior art light source system as represented in FIG. 1 includes a light source 10 and a color wheel 20, and light from the light source 10 is projected to the color wheel 20 through a light path (for example, guided by the lens 30); The color wheel 20 includes at least two regions having different optical characteristics, for example, four regions having different light transmission characteristics represented by 20a, 20b, 20c, and 20d. When the color wheel is in motion, each of the regions will continuously The rotation enters the projection range of the optical channel such that time-division transmission produces different monochromatic light.

When different light wavelength conversion materials are respectively carried in the form of coating, filling or filming on the four regions of the color wheel 20, each region will have different light wavelength conversion characteristics, so that each region is rotated into the light channel. The excitation light 11 from the illumination source 10 will be alternately converted into light rays having different wavelengths. One (e.g., 20a) or more (e.g., 20a and 2Gc) of the respective regions may be allowed to carry no light wavelength converting material to pass through the excitation light line 11.

The present invention designs and provides several embodiments for replacing the optical path structure of Figure 1 in accordance with the application of the light source. One of the embodiments shown in Fig. 3 is to match the color wheel 20 with a mirror and replace the transmission by reflection to change the direction of the optical path. Since this is replaced by the prior art, it will not be repeated here and below.

The second embodiment shown in FIG. 4 replaces the color wheel 20 with a rotating drum made of a transparent material, which is simplified. The curved surface is divided into three regions along the simple edge, and the light source 10 provides excitation light inside the transition 20 and is directed through a light tunnel (not shown) to a projection area.

The third embodiment shown in Fig. 5 replaces the color wheel 20 with a rectangular moving disk composed of an opaque material which is linearly reciprocated and divided into three regions through which the light is reflected. Changing the direction of the light channel.

The above several embodiments are not exhaustive for the structure of the light source system of the present invention, and other configurations in accordance with the inventive concept are also within the scope of the present invention. Therefore, for the sake of brevity, unless otherwise stated, the color grading device will include a sports disk having at least two regions having different light transmission characteristics, or a motion disk having at least two regions having different light wavelength conversion characteristics. (at least one of the regions carries a light wavelength converting material); the moving disk comprises a rotating disk or a moving disk; the light wavelength converting material comprises a phosphor, a dye or a quantum dot; the light source comprises an LED light source, a laser light source or UHP (Ultra High Performance) light. The process of controlling the operation of the light source system based on the above structure generally includes the steps of:

A. supplying power to the illumination source of the light source system; light from the illumination source is output through an optical channel;

B. controlling movement of a color grading device disposed on the light path; the color grading device comprising at least two regions having different optical characteristics, the movement of the color grading device causing each of the regions to be continuously rotated into the fascinating channel Based on the above steps, the present invention proposes a method for protecting the color grading device by: monitoring the movement of the color grading device, and cutting off the light source when the speed of the motion is small or equal to a predetermined value powered by. In order to prevent the coloring device from moving after the power supply system is powered, and the illumination source starts to work to damage the color grading device, the present invention may further adjust the execution order of the above steps as follows: the light source system first starts monitoring the movement of the color grading device And the step of controlling the execution of powering the illumination source. That is, the power supply control step of the illumination source is adjusted to be activated by the monitoring result, and the system can supply power to the illumination source only after the toner device is controlled to move and the motion speed is monitored to be reasonable. When the illumination source employs an LED, the light source system can be arranged to perform the step of monitoring the movement of the toning device once power is applied. Thus, after the system cuts off the power supply of the LED for some reason, the control unit continues to monitor the movement of the color grading device, so that after the cause is excluded, the recovery of the motion speed is detected as soon as possible (to be greater than the predetermined value). ), thereby restoring power to the illumination source. The specific monitoring measure may be: setting a positioning device on the color grading device for providing a basis for evaluation The reference signal of the moving speed of the coloring device is subjected to the monitoring by the control unit of the light source system. Taking an example of FIG. 3, the positioning device may be disposed as a protrusion 21 mounted on the edge of the color grading device 20; and a photodetector or electromechanical detecting device aligned with a predetermined position is disposed outside the color grading device 20, When the rotation of the color grading device 20 periodically moves the protrusion 21 to the predetermined position, a detection pulse is periodically triggered to be used as the reference signal. Taking a color wheel with a general rotation speed higher than 7200 rpm in the projection system as an example, if the control unit is implemented by a single chip microcomputer, the control unit can calculate the pulse appearing in the reference signal in units of seconds. Number, thereby estimating the rotational speed of the color wheel. When the number of pulses is found to decrease to a predetermined value, it means that the rotational speed is reduced to a level sufficient to jeopardize the efficacy of the phosphor or the material of the color wheel, and the supply of power to the illumination source should be quickly cut off. The predetermined value is empirically determined based on the particular color wheel or phosphor material. The single chip microcomputer can also be replaced by an FPGA (Field Programmable Gate Array), a CPLD (Comlpex Programmable Logic Device) or a DSP (Digital Signal Processor). The minimum accuracy of the above monitoring is 1 second, and it is still possible to cause damage to some of the more fragile phosphors. Therefore, the correlation between each pulse width and the color wheel rotation speed can be utilized, so that the control unit calculates the pulse width of each pulse in real time, and when the pulse width of one pulse or the pulse width of a plurality of consecutive pulses is detected to be a predetermined value, At the time, the power supply to the illumination source is quickly cut off.

Since the malfunction of the color grading device may be caused by an abnormal operation of the servo device of the color grading device, and the rotating disk or the moving disk generates motion under the action of the servo device, the servo device may output an angle. Or a position-dependent signal, therefore, the positioning device can be set as part of the servo device, and the angle or position-related signal can be used as the reference signal.

In addition, as shown in FIG. 4: the positioning device may also be a reflection or absorption device (for example, a reflection block 21 disposed on the inner wall of the simplification) installed in the color grading device; Mounting a photoelectric transmitting and receiving device, for example, using the light source as a transmitting device, and further providing a light detecting receiving device 41; the movement of the color adjusting device causes the photoelectric transmitting and receiving device to be turned on or by the reflecting block 21 Blocked to generate the reference signal. Or the positioning device is a photodetector mounted on the edge of the exiting optical path outside the color grading device, as shown by the photodetector 42 of FIG. 4, the detection sensitivity of the probe varies with the wavelength of the light, thereby The motion of the motion device uses the change in the probe output signal as the reference signal. Accordingly, the adjustment control unit recognizes the reference signal and evaluates the manner in which the color grading device moves. The positioning device may further be a linear or circular grating mounted in the color grading device, and a photodetector is mounted outside the color grading device, thereby directly correspondingly by "reading" the grating scale Reference signals at different locations. In accordance with the method of the present invention, the protective device of the present invention designed to protect the color system of the light source system, as shown in Figure 2, includes a control unit and a positioning device (not shown) disposed on the toner unit. The positioning device provides a reference signal that varies with the movement of the color grading device to the control unit; the control unit outputs a control signal to the power switch of the illumination source, whereby the control unit evaluates according to the reference signal The movement speed of the color grading device and the corresponding control signal are provided to cut or turn on the power supply to the illumination source. A projection system using the protection method and apparatus of the present invention, as an example of a specific embodiment, includes a light source system including a light source and a color concentrating device, and light from the light source is projected to the tone through an optical channel Coloring device; the color grading device includes at least three regions having different optical characteristics, each of the regions will be continuously rotated into a projection range of the optical channel when the color grading device is in a moving state, so that the light source system provides At least three monochromatic beams of red, green and blue light. When the optical characteristic refers to a light transmitting (transmitting or reflecting) characteristic of the same incident light, the color grading device includes at least three having different light transmitting characteristics corresponding to the red, green, and blue light phases, respectively. The color wheel of the area. When the optical characteristic refers to different light wavelength conversion characteristics for the same incident light, the color grading device includes at least three regions having different light wavelength conversion characteristics respectively corresponding to the red, green, and blue light phases The color wheel has at least two kinds of light wavelength conversion materials distributed in different regions. That is, for the color wheel embodiment of Figure 6, two of the regions &, b, c, and d are allowed to have the same optical characteristics and correspond to the same monochromatic light output; and at least one region is allowed to use no light. The wavelength converting material, just straight through, utilizes light from the source of illumination. In the case of higher color requirements, it is also possible to output blue, green, yellow, and red 0-color monochromatic beams in the regions a, b, c, and d, respectively. The projection system further includes a light valve for modulating the red, green, and blue light beams to produce a color image, such as the illustrated digital micromirror device (DMD); and for projecting red modulated by the light valve , a green, blue light beam to the screen to produce an image of the light projection lens; further comprising an image signal processor that controls the light output of the light source system by the drive signal and outputs corresponding image data to the light valve. The projection system further includes a control unit and a positioning device disposed on the color grading device; in the embodiment of FIG. 6, the control unit may be an internal unit of the image signal processor. The positioning device provides a reference signal that varies with the movement of the color grading device to the control unit. The control unit outputs a control signal to the power switch of the illumination source. In the projection system, taking the LED illumination source as an example, only a part of the obtained electric energy is converted into light energy, and another part is converted into thermal energy. In order to ensure the normal operation of the LED, a heat sink is usually disposed on the back side of, for example, but not limited to, the LED metal substrate. In some specific situations, such as the failure of the heat sink, the LED will overheat and damage due to the rapid rise of temperature caused by self-heating, so that the projection system cannot be displayed normally. To this end, as shown by the dotted line in FIG. 2, the control unit of the projection system of the present invention can simultaneously monitor a temperature control signal. The control unit can be connected to an output of a temperature sensor (not shown); the temperature sensor senses ambient temperature changes from the heat sink and outputs a corresponding temperature control signal. When the control unit detects that the ambient temperature or temperature change represented by the temperature control signal exceeds a predetermined warning value, it may give a control signal for causing the system to generate an alarm; when a predetermined threshold value that may damage the illumination source is reached, output one A control signal is applied to the power switch of the illumination source to completely cut off the power supply to ensure the safety of the illumination source. The temperature sensor, for example, when the heat sensitive component is used, can be directly mounted on the substrate of the LED light source, so that the magnitude of the resistance changes according to the ambient temperature. The temperature control signal is actually a sampled voltage or sampled current signal associated with the heat sensitive component. The signal may be an analog signal or a digital signal, and the corresponding signal transformation may be performed according to the interface requirements of the control unit. The temperature sensor can also employ other types of sensors and adjust the corresponding signal type. Because these are all prior art, they will not be described again. Experiments have shown that the light source system or projection system using the method of the present invention can effectively protect the phosphor or the color wheel under the premise of little hardware modification.

Claims

Claim

A protection device for a color grading device, comprising: a light source system, the light source system comprising a light source and a color concentrating device, wherein light from the light source is projected to the color grading device through an optical channel; The apparatus includes at least two regions having different optical characteristics, each of the regions being continuously rotated into a projection range of the optical channel when the toning device is in motion; characterized in that:

The protection device includes a control unit and a positioning device disposed on the color grading device; the positioning device provides a reference signal that varies with the movement of the color grading device to the control unit; the control unit outputs A control signal is applied to the power switch of the illumination source.

2. The protection device for a color grading device according to claim 1, wherein:

The control unit is further connected to an output of a temperature sensor; the temperature sensor senses an ambient temperature change of the heat sink from the illumination source and outputs a corresponding temperature control signal.

3. The protection device for a color grading device according to claim 1, wherein:

The illumination source uses an LED light source, a laser light source or an ultra high performance lamp.

4. The protection device for a color grading device according to claim 1, wherein:

The color grading device is a moving disk having at least two regions having different light transmission characteristics; or having at least two regions having different light wavelength conversion characteristics, wherein at least one region carries a light wavelength conversion material.

5. According to the profit-making requirements, the protection device of the color-changing device is characterized in that:

The sports disc is a rotating disc or a moving disc.

6. According to the profit requirement 4, the protective device of the color grading device is characterized in that:

The optical wavelength converting material comprises a phosphor, a dye or a quantum dot.

7. A method of protecting a color grading device, for controlling a light source system, comprising: a step of supplying power to the light source of the light source system; light from the light source is output through an optical channel; controlling a step of moving a color grading device disposed on the light path; the color grading device includes At least two regions of optical characteristics, the movement of the color grading device causes each of the regions to be continuously rotated into the fascinating channel; and the method further includes the steps of:

Monitoring the movement of the color grading device to cut off power to the illumination source when the speed of the motion is detected to be small or equal to a predetermined value; otherwise, powering the illumination source is initiated or maintained.

8. The method of protecting a color grading device according to claim 7, characterized in that:

The light source system first initiates a step of monitoring the movement of the color grading device to control the step of powering the illumination source.

9. A method of protecting a color grading device according to claim 7 or 8, characterized in that:

Once the light source system is powered up, the step of monitoring the movement of the color grading device is always performed.

10. The method of protecting a color grading device according to claim 7, wherein:

The color grading device is a sports disk.

11. A method of protecting a color grading device according to claim 10, characterized in that:

The sports disc is a rotating disc or a moving disc.

12. The method of protecting a color grading device according to claim 7, wherein:

The different optical properties either refer to different transmission or reflection characteristics of the region to the same incident light; or when the optical wavelength conversion material is carried on one of the regions, the difference in the same incident light for the region Optical wavelength conversion characteristics.

13. The method of protecting a color grading device according to claim 12, wherein:

14. The method of protecting a color grading device according to claim 12, wherein:

The light wavelength converting material is carried onto the area in the form of a coating, filling or filming.

15. The method of protecting a color grading device according to claim 7, wherein:

When monitoring the movement of the color grading device, a positioning device is disposed on the color grading device for providing a reference signal for evaluating the moving speed of the color grading device to the control unit of the light source system Monitored.

16. A method of protecting a color grading device according to claim 15, wherein:

The positioning device is included in a servo of the color grading device, and the reference signal is an angle or position related signal output by the servo device.

17. A method of protecting a color grading device according to claim 15, wherein:

The locating means is a projection mounted on the edge of the grading means, the movement of the grading means causing the projection to periodically trigger an optical or electromechanical detection signal for use as the reference signal.

18. A method of protecting a color grading device according to claim 15, wherein:

The positioning device is a reflection or absorption device installed in the color grading device, and a photoelectric transmitting and receiving device is statically mounted outside the color grading device, and the movement of the color grading device causes the photoelectric transmitting and receiving device to be turned on. Or blocking to generate the reference signal.

19. A method of protecting a color grading device according to claim 15, wherein:

The positioning device is a photoelectric probe mounted on an edge of the exiting optical path outside the color grading device, and the detection sensitivity of the probe varies with the wavelength of the light, so that the probe outputs a signal according to the movement of the moving device. The change is used as the reference signal.

20. The method of protecting a color grading device according to claim 15, wherein:

The positioning device is a linear or circular grating mounted in the color grading device, in the color grading device A photodetector is also mounted to directly give reference signals corresponding to different positions by "reading" the scale.

21. The method of protecting a color grading device according to any one of claims 15 to 20, characterized in that:

The control unit evaluates the moving speed of the coloring device based on the pulse width of the reference signal, or evaluates the moving speed of the coloring device based on the number of pulses of the reference signal per unit time.

22. A method of protecting a color grading device according to claim 7, characterized in that:

23. A projection system comprising a light source system comprising an illumination source and a toning device, the light from the illumination source being projected to the toning device through an optical channel; the toning device comprising different optical properties At least three regions, when the color grading device is in motion, each of the regions will continuously rotate into a projection range of the optical channel, so that the light source system provides a plurality of orders including red, green, and blue light a color light beam; the projection system further comprising a light valve for modulating the red, green, and blue light beams to produce a color image, and for projecting red, green, and blue light beams modulated by the light valve to the screen to generate an image The projection system further includes an image signal processor, the image signal processor controls the light output of the light source system by driving the signal, and outputs corresponding image data to the light valve;

The projection system further includes a control unit and a positioning device disposed on the color grading device; the positioning device provides a reference signal that varies with the movement of the color grading device to the control unit; A control signal is output to the power switch of the illumination source.

24. The projection system according to claim 23, characterized in that:

The control unit is an internal unit of the image signal processor.

25. The projection system according to claim 23, characterized in that:

The control unit is further connected to an output of the temperature sensor; the temperature sensor senses an environmental temperature change of the heat sink from the illumination source and outputs a corresponding temperature control signal.

26. The projection system of claim 25, wherein:

When the control unit detects that the ambient temperature or temperature change represented by the temperature control signal exceeds a predetermined warning value, a control signal for causing the system to generate an alarm is given.

27. The projection system of claim 25, wherein:

When the control unit detects that the ambient temperature or temperature change represented by the temperature control signal reaches a predetermined threshold, a control signal is output to the power switch of the illumination source to completely cut off the power.

28. The projection system of claim 23, wherein:

29. The projection system according to claim 23, characterized in that:

The light valve uses a digital micromirror device.

30. The projection system according to claim 23, characterized in that:

The color grading device includes a color wheel having at least three regions respectively having different light transmission characteristics corresponding to the red, green, and blue light phases; or including having a phase corresponding to the red light, the recording light, and the blue light Corresponding color wheels of at least three regions having different light wavelength conversion characteristics, the color wheel carrying at least two kinds of light wavelength conversion materials distributed in different regions.