WO2020253374A1 - 投影显示方法及*** - Google Patents

投影显示方法及*** Download PDF

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Publication number
WO2020253374A1
WO2020253374A1 PCT/CN2020/086629 CN2020086629W WO2020253374A1 WO 2020253374 A1 WO2020253374 A1 WO 2020253374A1 CN 2020086629 W CN2020086629 W CN 2020086629W WO 2020253374 A1 WO2020253374 A1 WO 2020253374A1
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WIPO (PCT)
Prior art keywords
laser
light
signal
image
primary color
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Application number
PCT/CN2020/086629
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English (en)
French (fr)
Inventor
肖纪臣
陈许
Original Assignee
青岛海信激光显示股份有限公司
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Publication of WO2020253374A1 publication Critical patent/WO2020253374A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • 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 disclosure relates to the field of laser projection technology, in particular to a projection display method and system.
  • Laser projection equipment includes a laser projector and a display screen.
  • the laser projector projects laser light to the display screen according to the picture to be displayed to display the picture on the display screen. Since the laser is a high-energy light source, when the laser is irradiated to the human eye, it will cause great damage to the human eye. Therefore, it is necessary to configure the eye protection function in the laser projection equipment to reduce the damage to the human eye by the laser projection equipment .
  • a projection display method including:
  • control system When the control system receives a detection signal indicating that there is an obstacle in the laser projection area, according to the image information of the image to be displayed, it synchronously outputs a drive signal for the laser and a control signal for the light valve, and the drive signal is used to drive the After the laser beam emitted by the laser irradiates the color wheel, the color wheel emits fluorescent primary color light;
  • the laser emits a laser beam under the driving of the driving signal
  • the color wheel performs wavelength conversion on the received laser beam, and emits fluorescent primary color light of at least one color
  • the light valve modulates the received light beam under the control of the control signal, and outputs the modulated fluorescent primary color light to the lens for imaging.
  • a projection display system in another aspect, includes a laser, a control system, a color wheel, a light valve, and a lens;
  • the control system is used for synchronously outputting the driving signal for the laser and the control signal for the light valve according to the image information of the image to be displayed when receiving the detection signal indicating that there is an obstacle in the laser projection area, so
  • the driving signal is used to drive the laser beam emitted by the laser to make the color wheel emit fluorescent primary color light after irradiating the color wheel;
  • the laser is used to emit a laser beam under the driving of the driving signal
  • the color wheel is used to perform wavelength conversion on the received laser beam to emit fluorescent primary color light of at least one color
  • the light valve is used to modulate the received light beam under the control of the control signal, and output the modulated fluorescent primary color light to the lens for imaging.
  • Fig. 1 is a schematic structural diagram of a projection display system provided by an embodiment of the present disclosure.
  • Fig. 2 is a schematic diagram of a color wheel partition provided by an embodiment of the present disclosure.
  • Fig. 3 is a schematic structural diagram of another projection display system provided by an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a signal processing unit provided by an embodiment of the present disclosure.
  • Fig. 5 is a flowchart of a projection display method provided by an embodiment of the present disclosure.
  • Fig. 6 is a flowchart of another projection display method provided by an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of an image to be displayed according to an embodiment of the present disclosure.
  • FIG. 8 is a flowchart of still another projection display method provided by an embodiment of the present disclosure.
  • FIG. 1 is a schematic diagram of a projection display system 10 involved in a projection display method provided by an embodiment of the present disclosure. As shown in FIG. 1, the system includes: a laser 101, a control system 102, a color wheel 103, a light valve 104 and a lens 105.
  • the control system 102 is used for synchronously outputting a driving signal for the laser 101 and a control signal for the light valve 104 according to the image information of the image to be displayed when receiving a detection signal indicating that there is an obstacle in the laser projection area.
  • the driving signal is used for The driving laser 101 emits a laser beam to irradiate the color wheel 103 so that the color wheel 103 emits fluorescent primary color light.
  • the detection signal is used to indicate that there is an object to be protected in the laser projection area of the laser 101.
  • the laser 101 is used to emit a laser beam driven by a driving signal.
  • the laser 101 is used to emit a laser beam of at least one color.
  • the color wheel 103 is used to perform wavelength conversion on the received laser beam and emit fluorescent primary color light of at least one color.
  • the light valve 104 is used to modulate the received light beam under the control of the control signal, and output the modulated fluorescent primary color light to the lens 105 for imaging.
  • the color wheel 103 is also used to transmit the laser beam irradiated to the color wheel 103.
  • the color wheel 103 has a fluorescent area and a laser transmission area.
  • the fluorescent powder is arranged in the fluorescent area, and when the laser beam irradiates the fluorescent area, the laser beam can excite the fluorescent powder in the fluorescent area to emit fluorescence of corresponding color.
  • the laser beam is transmitted.
  • the laser beam emitted by the laser 101 is irradiated to different areas of the fluorescent wheel in turn and periodically, which can make the laser 101 sequential
  • the ground output color is the light beam of the color corresponding to the illuminated area of the fluorescent wheel.
  • the laser 101 can emit blue laser light.
  • the color wheel 103 has a green phosphor area, a red phosphor area, and a laser transmission area.
  • the green phosphor area is provided with green phosphor
  • the red phosphor area is provided with Red phosphor.
  • the blue laser beam emitted by the laser 101 irradiates the green phosphor in the green phosphor area
  • the green phosphor can emit green fluorescence under the excitation of the blue laser beam.
  • the blue laser beam irradiates the red phosphor in the red phosphor area
  • the red phosphor can emit red fluorescence under the excitation of the blue laser beam.
  • the blue laser beam irradiates the laser transmission area, the blue laser beam will be transmitted out.
  • the light beam emitted from the color wheel 103 may include a laser beam and a fluorescent light beam.
  • the light valve 104 may be controlled by the control system 102 to realize the projection display protection function.
  • the light valve 104 can reflect the received fluorescent light beam at a positive deflection angle under the control of the control signal.
  • the color wheel 103 transmits the laser beam to the light valve 104
  • the light valve 104 is also used to reflect the received laser beam at a negative deflection angle under the control of the control signal.
  • the light beam irradiated to the surface of the light valve 104 can also be filtered by the light valve 104 to reflect the light beam required for displaying the image to the lens 105.
  • the control system 102 may control the light valve 104 to reflect the received light beam at a positive deflection angle, and reflect the light beam to the lens 105 imaging, and then realize the image display.
  • control system 102 determines that the light beam irradiated to the light valve 104 is a light beam that is not needed for displaying images, the control system 102 can control the light valve 104 to reflect the received light beam at a negative deflection angle, and reflect the light beam to the light absorption device , So that the light beam cannot be irradiated to the lens 105 for imaging.
  • the control system 102 can provide the laser 101 with a driving signal to stop light-emitting, so that the laser 101 is Stop lighting under the drive of
  • the laser 101 may also be provided with a driving signal with a reduced amplitude to reduce the brightness of the laser beam emitted by the laser 101. This can reduce the energy consumption due to laser light emission.
  • the laser 101 emits light in synchronization with the rotation of the color wheel 103.
  • the control system 102 can provide the laser 101 with a driving signal to stop emitting light to drive the laser 101 to stop emitting light.
  • the control system 102 may not provide a driving signal to the laser 101, so that the laser 101 can stop emitting laser light.
  • the control system 102 may also provide the laser 101 with a driving signal with a reduced amplitude to reduce the brightness of the laser beam emitted by the laser 101.
  • the control system 102 may provide the laser 101 with a driving signal for the red light beam, a driving signal for the green light beam, and a driving signal for the blue light beam, respectively.
  • the driving signal of the color beam may be provided.
  • the control system 102 is used to provide the laser 101 with a drive signal for the red light beam in synchronization with the time when the laser beam emitted by the laser 101 irradiates the red phosphor area in the color wheel 103, and the control system 102 is used to provide the laser 101 with a green light
  • the time of the driving signal of the light beam is synchronized with the time when the laser beam emitted by the laser 101 irradiates the green phosphor area in the color wheel 103.
  • the control system 102 is used to provide the laser 101 with a driving signal for the blue light beam.
  • the time when the laser beam emitted by 101 irradiates the laser transmission area in the color wheel 103 is synchronized. In some embodiments, as shown in FIG.
  • the control system 102 may include: a control device 1021 and a driving device 1022.
  • the control device 1021 is configured to send a control signal to the driving device 1022 according to display requirements, and the control signal may carry the projection parameters of the laser 101.
  • the projection parameter may be luminous brightness and the like.
  • the driving device 1022 is configured to provide a driving signal to the laser 101 according to the light emission parameter carried in the received control signal.
  • the driving signal may be a driving current.
  • the driving device 1022 may include a plurality of driving modules, which are used to provide the laser 101 with driving signals for light beams of different colors.
  • the driving device 1022 may include: a driving module for a red light beam, a driving module for a green light beam, and a driving module for a blue light beam.
  • the red drive module is used to provide the laser 101 with a red drive signal for the red beam
  • the green drive module is used to provide the laser 101 with a blue drive signal for the blue beam.
  • the synchronization of the driving signal of each color with the color wheel 103 can be realized by a signal gating function.
  • a gate circuit may be connected in series between the control device 1021 and the driving device 1022, and at least three switch sub-circuits may be provided in the gate circuit, and each switch sub-circuit corresponds to a region of the color wheel 103 respectively.
  • Each switch sub-circuit has a control terminal, an input terminal and an output terminal.
  • the control device 1021 can respectively send a red control signal, a green control signal and a blue control signal to the input terminals of the three switch sub-circuits.
  • the control of each color The signal carries the projection parameters of the corresponding color.
  • the control device 1021 can respectively send the red selection signal, the green selection signal and the blue selection signal to the control terminals of the three switch sub-circuits, and the selection signals of the three colors are at the same time Only one selection signal is at the effective level, that is, only one switch sub-circuit can output the control signal of the corresponding color to the driving device 1022 through the output terminal at the same time, and the driving device 1022 according to the projection parameter carried in the control signal of the corresponding color,
  • the laser 101 is provided with a drive signal corresponding to the projection parameter to drive the laser 101 to emit laser light that conforms to the projection parameter.
  • the period during which the selection signal is at the effective level coincides with the period during which the laser beam irradiates the region of the corresponding color in the color wheel 103.
  • the projection display system may further include: a storage device 106, and the storage device 106 may store image information of the image to be displayed, etc.
  • the control system 102 may further include: a multimedia processing unit 1023.
  • the multimedia processing unit 1023 can obtain the image information of the image to be displayed from the storage device 106, and send the image information to the control device 1021, so that the control device 1021 can send or drive the light valve 104 according to the image information.
  • the device 1022 sends a control signal to realize the display of the image.
  • the image to be displayed may be an image determined according to actual needs.
  • the image to be displayed may be an image used to remind the user that the projection display system is in the eye protection mode
  • the control system 102 determines that there is an object to be protected in the laser projection area (such as a person)
  • the image information of the image to be displayed can be obtained from the storage device 106, and the light valve 104 can be controlled according to the image information of the image to be displayed to image the image to be displayed on the lens 105, thereby prompting the user
  • the projection display system is in the eye protection mode.
  • the color of the primary color component of the image to be displayed may be different from the color of the laser beam emitted by the laser 101.
  • the following two examples illustrate its implementation:
  • the primary color component of the image to be displayed is a fluorescent primary color light.
  • the image to be displayed may include a pattern area and other areas, and the other area is an area excluding the pattern area in the image to be displayed.
  • the pattern area has a prompt pattern, and the fluorescent primary color light is used to display the prompt pattern.
  • the prompt pattern can be a text or an icon.
  • the optical power density of fluorescence is much smaller than that of laser, the damage caused by fluorescence to human eyes is much less than that caused by laser. Therefore, when the primary color component of the image to be displayed is a fluorescent primary color light, It can not only realize the prompt function, but also effectively reduce the damage to human eyes.
  • the pixel values of the pixels in the other regions may all be smaller than the pixel values of the pixels in the prompt pattern.
  • the gray levels of the pixels in the other area may all be low gray levels, so that the pixels in the other area appear black or dark. In this way, the prompt function can be realized, the damage to human eyes can be reduced, and the display energy consumption of the control system 102 can be effectively reduced.
  • the laser 101 is used to emit a blue laser beam.
  • the primary color component of the image to be displayed may be green fluorescent primary color light.
  • the green fluorescent primary color light is used to display the prompt pattern in the image to be displayed.
  • the pixels in other areas are all black.
  • the primary color component of the image to be displayed may be composed of two fluorescent primary color lights
  • the image to be displayed may be composed of a prompt pattern and a background pattern, and one of the two fluorescent primary color lights is used to display the prompt pattern , The other of the two fluorescent primary colors is used to display background patterns.
  • the primary color component of the image to be displayed may also include a laser beam, but the laser beam occupies a small proportion of the primary color component of the image to be displayed. And the proportion can be reduced by reducing the brightness of the emitted laser beam, or by controlling the amount of laser reflection by the light valve 104, so that when the laser beam reflected to the lens 105 is a certain value, the image formed in the lens 105 It can still meet the needs of projection display protection.
  • the method for reducing the brightness of the laser beam emitted may be: reducing the size of the driving current provided to the laser 101 according to the image information, so as to reduce the brightness of the laser beam emitted by the laser 101.
  • the amount of laser beams reflected to the lens 105 can be determined according to the national standards of laser safety levels. For example, the amount of laser beams reflected to the lens 105 can meet the following requirements: at a distance of 1051 dm from the lens, a 7 mm beam with a gorgeous aperture The optical power is less than or equal to 0.039 milliwatts.
  • the amount of the laser beam reflected to the lens 105 may be determined according to the working mode of the projection display system. That is, in different working modes, different amounts of laser light can be reflected to the lens 105.
  • the working mode of the projection display system may include: child mode, youth mode, day mode and night mode, etc. In each working mode, a corresponding amount of laser light can be reflected to the lens 105. When the user sets the working mode of the projection display system to In the child mode, the amount corresponding to the child mode can be reflected to the lens 105.
  • the projection display system may further include: an opto-mechanical lighting device 107 and an optical path 108.
  • the optomechanical lighting device 107 is arranged between the color wheel 103 and the light valve 104 and is used to project the light beam emitted by the color wheel 103 to the light valve 104.
  • the optical passage 108 is arranged between the light valve 104 and the lens 105, and is used to shape and constrain the beam array reflected by the light valve 104, so that the beam array that has undergone the shaping and restriction has a certain shape. For example, when the image to be displayed is rectangular, the beam array reflected by the light valve 104 can be shaped to obtain a rectangular beam array, so that the displayed image is rectangular.
  • the projection display system may be a digital light processing (digital light processing, DLP) system.
  • the projection display system may include a micromirror device.
  • the micromirror device may be a digital micromirror device (DMD), and the DMD may include a plurality of light valves 104 (also called micro lenses) arranged in an array, and the plurality of light valves 104 may be connected to the image to be displayed.
  • DMD digital micromirror device
  • the DMD may include a plurality of light valves 104 (also called micro lenses) arranged in an array, and the plurality of light valves 104 may be connected to the image to be displayed.
  • multiple pixels Generally, multiple light valves 104 correspond to multiple pixels in a one-to-one correspondence.
  • the projection display system may further include: a detection device 109.
  • the detection device 109 is used to detect whether there is an object to be protected in the laser projection area of the laser 101, and when it is determined that there is an object to be protected in the laser projection area, it sends a detection signal indicating that there is an obstacle in the laser projection area to the control system.
  • the object to be protected may be a person.
  • the detection device 109 may include: a sensor unit 1091, a signal processing unit 1092, and a signal logic unit 1093.
  • the sensor unit 1091 is used to detect whether there is an infrared signal in the laser projection area, convert the detected infrared signal into an electrical signal, and send the electrical signal to the signal processing unit 1092.
  • the signal processing unit 1092 is used to sequentially amplify, compare, and logically process the electrical signal to obtain a pulse signal, and send the pulse signal to the signal logic unit 1093.
  • the logical processing can be logical OR processing.
  • the signal logic unit 1093 may not be able to recognize the electrical signal. Therefore, the electrical signal Before sending to the signal logic unit 1093, a series of processing operations such as amplifying the electrical signal by the signal processing unit 1092 can enable the signal logic unit 1093 to effectively identify and process the electrical signal and improve the accuracy of detection.
  • the signal logic unit 1093 is used to determine whether there is a target living body in the laser projection area based on the pulse signal, and send an effective level signal to the control system 102 when the target living body exists in the laser projection area.
  • the effective level signal is a detection signal used to indicate the presence of obstacles in the laser projection area.
  • the signal processing unit 1092 may include: an amplification module 1092a, a comparison module 1092b, and a logic module 1092c.
  • the amplifying module 1092a is used to amplify the electrical signal.
  • the electrical signal sent by the sensor unit 1091 is signal A
  • the amplifying module 1092a amplifies the signal A as a whole to obtain signal B.
  • the maximum value of signal A is 2mv
  • the maximum value of signal B after amplification is 2.5v.
  • the minimum value of signal A is 0.5mv
  • the minimum value of signal B after amplification is 0.5v.
  • the comparison module 1092b stores a high voltage threshold and a low voltage threshold.
  • the comparison module 1092b can compare the amplitude of the amplified electrical signal at different moments with the high voltage threshold and the low voltage threshold to obtain two pulse signals. .
  • the comparison module 1092b is provided with a high voltage threshold a1 and a low voltage threshold a2.
  • the absolute value of the amplitude of the signal B at different moments is compared with the high voltage threshold a1 to obtain the pulse signal C.
  • the pulse signal C when the absolute value of the amplitude of the signal B at a certain moment is greater than the high voltage threshold a1, the pulse signal C has a high level at that moment, and when the absolute value of the amplitude of the signal B at a certain moment is less than the high voltage threshold a1 When the pulse signal C is at a low level at that moment.
  • the absolute value of the amplitude of the signal B at different moments is compared with the low voltage threshold a2 to obtain the pulse signal D.
  • the pulse signal D when the absolute value of the amplitude of the signal B at a certain time is greater than the low voltage threshold a2, the pulse signal D has a high level at that time, and when the absolute value of the amplitude of the signal B at a certain time is less than a2, The pulse signal D has a low level at this moment.
  • the logic module 1092c can perform a logical OR operation on the two pulse signals output by the comparison module 1092b to obtain a pulse signal. For example, as shown in FIG. 4, the logic module 1092c can perform a logical OR operation on the pulse signal C and the pulse signal D to obtain the pulse signal E.
  • the signal logic unit 1093 can count the number of pulses of the pulse signal in a unit time period, and compare the number of pulses with the reference number threshold. By comparison, when the number is greater than or equal to the reference number threshold, the signal logic unit 1093 determines that there is a target living body in the laser projection area, and sends a notification signal to the control system 102. When the number is less than the reference number threshold, the signal logic unit 1093 determines that there is no target living body in the laser projection area, and does not send a notification signal to the control system 102.
  • the reference number threshold may be determined based on the energy of infrared rays emitted by the target living body.
  • the signal logic unit 1093 can detect whether another pulse is received within the reference duration after receiving a pulse, and if another pulse is received within the reference duration, determine that there is a target living body in the laser projection area and send it to the control system 102 sends a notification signal. If another pulse is not received within the reference time period, it is determined that there is no target living body in the laser projection area, and the notification signal is not sent to the control system 102.
  • the reference duration can be determined according to actual needs, for example, the reference duration can be 3 seconds.
  • FIG. 5 is a flowchart of a projection display method provided by an embodiment of the present disclosure. Please refer to FIG. 5. The method includes:
  • Step 501 When the control system receives a detection signal indicating that there is an obstacle in the laser projection area, it synchronously outputs a drive signal for the laser and a control signal for the light valve according to the image information of the image to be displayed.
  • the driving signal is used to drive the laser beam emitted by the laser to make the color wheel emit fluorescent primary color light after irradiating the color wheel.
  • the control signal is used to control the reflection angle of the light valve to the beam.
  • Step 502 The laser emits a laser beam under the driving of the driving signal.
  • Step 503 The color wheel performs wavelength conversion on the received laser beam, and emits fluorescent primary color light of at least one color.
  • Step 504 The light valve modulates the received light beam under the control of the control signal, and outputs the modulated fluorescent primary color light to the lens for imaging.
  • the projection display method synchronously outputs the drive signal to the laser and the control signal to the light valve through the control system to drive the laser beam emitted by the laser to irradiate the color wheel to make the color wheel Emit fluorescent primary color light, and control the light valve to modulate the received light beam, and output the modulated fluorescent primary color light to the lens for imaging.
  • the optical power density of fluorescence is much smaller than that of laser light.
  • the fluorescent primary color light displays the image to be displayed, effectively reducing the optical power density of the beam reflected to the lens, reducing the optical power of the beam contacting the object to be protected, and effectively improving the efficiency of protecting the object to be protected .
  • the projection display method is applied to realize the human eye protection function, the efficiency of protecting the human eye can be improved.
  • FIG. 6 is a flowchart of another projection display method provided by an embodiment of the present disclosure.
  • the method can be applied to the projection display system provided by the embodiment of the present disclosure.
  • the method realizes projection display protection by controlling the light valve's reflection direction of the light beam.
  • the method may include:
  • Step 601 The detection device detects whether there is an object to be protected in the laser projection area.
  • this step 601 please refer to the implementation of the detection of the object to be protected by the detection device in the aforementioned projection display system.
  • Step 602 When determining that there is an object to be protected in the laser projection area, the detection device sends a first notification signal to the control system.
  • the first notification signal is used to notify the control system that there is an object to be protected in the laser projection area.
  • Step 603 The control system acquires image information of the image to be displayed in the storage device based on the first notification signal.
  • the image to be displayed may be an image determined according to actual needs.
  • the image to be displayed may be an image used to remind the user that the projection display system is in the eye protection mode, and the control system determines that there is an object to be protected (such as When a person), the image information of the image to be displayed can be obtained from the storage device 105, and the light valve can be controlled according to the image information of the image to be displayed to realize the display of the image to be displayed, thereby prompting the user of the projection display system In the eye protection mode.
  • the color of the primary color component of the image to be displayed may be different from the color of the laser beam emitted by the laser.
  • the following two examples illustrate its implementation:
  • the primary color component of the image to be displayed is a fluorescent primary color light.
  • the image to be displayed may include a pattern area and other areas, and the other area is an area excluding the pattern area in the image to be displayed.
  • the pattern area has a prompt pattern, and the fluorescent primary color light is used to display the prompt pattern.
  • the prompt pattern can be a text or an icon. Because the optical power density of fluorescence is much smaller than that of laser, the damage caused by fluorescence to human eyes is much less than that caused by laser. Therefore, when the primary color component of the image to be displayed is a fluorescent primary color light, both It can realize the prompt function and can effectively reduce the damage to human eyes.
  • the pixel values of the pixels in the other regions may all be smaller than the pixel values of the pixels in the prompt pattern.
  • the gray levels of the pixels in the other area may all be low gray levels, so that the pixels in the other area appear black or dark.
  • the prompt function can be realized, the damage to the human eyes can be reduced, and the display energy consumption of the control system can be effectively reduced.
  • the display color of the area filled with diagonal lines in FIG. 7 is fluorescent green, and the display color of other areas is black.
  • the laser is used to emit a blue laser beam.
  • the primary color component of the image to be displayed can be green fluorescent primary light, that is, the green fluorescent primary light is used to display the prompt pattern in the image to be displayed, and other The pixels in the area are all black.
  • the primary color component of the image to be displayed is composed of two fluorescent primary colors
  • the image to be displayed is composed of a prompt pattern and a background pattern
  • one of the two fluorescent primary colors is used to display the prompt pattern
  • the two fluorescent primary colors The other of the primary colors is used to display background patterns.
  • the primary color component of the image to be displayed may also include a laser beam, but the laser beam occupies a small proportion of the primary color component of the image to be displayed. And the proportion can be reduced by reducing the brightness of the emitted laser beam, or by controlling the amount of laser reflection by the light valve, so that when the laser beam reflected to the lens is a certain value, the image formed in the lens can still satisfy Projection display protection needs.
  • the implementation manner of reducing the brightness of the emitted laser beam may be: reducing the size of the driving current provided to the laser according to the image information, so as to reduce the brightness of the laser beam emitted by the laser.
  • the amount of laser beam reflected to the lens can be determined according to the national standards of laser safety level.
  • the amount of laser beam reflected to the lens can meet the following requirements: at a distance of 1 dm from the lens, the amount of beams with a 7 mm aperture The power is less than or equal to 0.039 milliwatts.
  • the amount of the laser beam reflected to the lens can be determined according to the working mode of the projection display system. That is, in different working modes, different amounts of laser light can be reflected to the lens.
  • the working mode of the projection display system can include: child mode, youth mode, day mode and night mode, etc. In each working mode, a corresponding amount of laser light can be reflected to the lens. When the user sets the working mode of the projection display system to children In mode, the amount corresponding to the child mode can be reflected to the lens.
  • Step 604 The control system synchronously outputs the drive signal for the laser and the control signal for the light valve according to the image information of the image to be displayed.
  • the drive signal is used to drive the laser to emit a laser beam.
  • the driving signal can be determined according to the image information of the image to be displayed.
  • the driving signal may be a driving current, and the amplitude of the driving current may be determined according to the pixel value of the pixel in the image information.
  • the control signal is used to control the reflection direction of the light valve to reflect the received signal.
  • the control signal may be determined based on the first notification signal and image information. For example, when the control system receives the first notification signal, the control signal is used to instruct the light valve to reflect the received laser beam at a negative deflection angle, and reflect the laser beam to the light absorption device, so that the beam cannot be irradiated to Lens imaging.
  • the control system does not receive the first notification signal, and according to the image information, it is determined that the light beam irradiated to the light valve is not needed to display the image, the control signal is used to instruct the light valve to perform a negative deflection angle on the received laser beam.
  • the laser beam is reflected to the light absorption device, so that the beam cannot be irradiated to the lens for imaging.
  • the control signal is used to instruct the light valve to reflect the received laser beam at a positive deflection angle , Reflect the laser beam to the lens for imaging.
  • Step 605 The laser emits a laser beam under the driving of the driving signal.
  • Step 606 The color wheel performs wavelength conversion on the received laser beam, and emits at least one color of fluorescent primary color light.
  • the color wheel can perform wavelength conversion on the received laser beam and emit at least one color of fluorescent primary light. And, for example, the color wheel may also transmit a laser beam irradiated to the color wheel.
  • the color wheel can have two fluorescent areas and a laser projection area. At this time, the color wheel can perform wavelength conversion on the laser beam irradiated to the fluorescent area and emit fluorescent primary color light corresponding to the color of the fluorescent area, and the color wheel can transmit and illuminate Laser beam to laser transmission area.
  • Step 607 The light valve modulates the received light beam under the control of the control signal, and outputs the modulated fluorescent primary color light to the lens for imaging.
  • the light beam emitted by the color wheel can be irradiated to the light valve after passing through the opto-mechanical lighting device.
  • the light valve can modulate the received light beam according to the received control signal and reflect the modulated light beam.
  • the light beam reflected by the light valve can be irradiated to the optical path, and after being shaped and restricted by the optical path, irradiated to the lens for imaging.
  • the light valve when the light beam irradiated to the light valve is a laser beam, in order to ensure the effective realization of the projection display protection function, the light valve can reflect the received laser beam at a negative deflection angle under the control of the control signal, so that the laser beam The light beam cannot reach the lens for imaging.
  • the light valve when the light beam irradiated to the light valve is a fluorescent light beam, the light valve can reflect the received fluorescent light beam at a positive deflection angle under the control of the control signal, so that the laser beam is irradiated to the lens for imaging .
  • the detection device determines that there is no object to be protected in the laser projection area, it can send a second notification signal to the control system, and the second notification signal is used to notify the control system that there is no object to be protected in the laser projection area.
  • the control system acquires the image information of the image to be displayed in the storage device based on the second notification signal, and synchronously outputs the drive signal for the laser and the control signal for the light valve according to the image information, so as to realize the image information to be displayed. display.
  • the projection display method synchronously outputs the drive signal to the laser and the control signal to the light valve through the control system to drive the laser beam emitted by the laser to irradiate the color wheel to make the color wheel Emit fluorescent primary color light, and control the light valve to modulate the received light beam, and output the modulated fluorescent primary color light to the lens for imaging.
  • the optical power density of fluorescence is much smaller than that of laser light.
  • the fluorescent primary color light displays the image to be displayed, effectively reducing the optical power density of the beam reflected to the lens, reducing the optical power of the beam contacting the object to be protected, and effectively improving the efficiency of protecting the object to be protected .
  • the projection display method is applied to realize the human eye protection function, the efficiency of protecting the human eye can be improved.
  • FIG. 8 is a flowchart of another projection display method provided by an embodiment of the present disclosure.
  • the method can be applied to the projection display system provided by the embodiment of the present disclosure.
  • the method realizes the projection display protection function by providing different drive signals to the laser. .
  • the method may include:
  • Step 801 The detection device detects whether there is an object to be protected in the laser projection area.
  • this step 801 please refer to the implementation of detecting the object to be protected by the detection device in the projection display system.
  • Step 802 When it is determined that there is an object to be protected in the laser projection area, the detection device sends a first notification signal to the control system.
  • the first notification signal is used to notify the control system that there is an object to be protected in the laser projection area.
  • Step 803 The control system obtains image information of the image to be displayed in the storage device based on the first notification signal.
  • this step 803 please refer to the implementation of the aforementioned step 603 accordingly.
  • Step 804 The control system synchronously outputs the drive signal for the laser and the control signal for the light valve according to the image information of the image to be displayed.
  • the driving signal is used to drive the laser beam emitted by the laser.
  • the driving signal can be determined according to the first notification signal. For example, during the period when the color wheel rotates to the laser transmission area, the control system can provide the laser with a driving signal to stop the laser from emitting light, so as to drive the laser to stop emitting light. Or, during this period, the control system may not provide a driving signal to the laser, so that the laser can stop emitting light.
  • the control signal is used to control the reflection direction of the light valve to reflect the received signal.
  • the control signal can be determined based on image information. For example, when it is determined according to the image information that the light beam irradiated to the light valve is not needed to display the image, the control signal is used to instruct the light valve to reflect the received laser beam at a negative deflection angle, and reflect the laser beam to the light Absorption device, so that the beam can not irradiate the lens to form an image.
  • the control signal is used to instruct the light valve to reflect the received laser beam at a positive deflection angle, and reflect the laser beam to the lens for imaging.
  • Step 805 The laser emits or does not emit a laser beam under the driving of the driving signal.
  • the laser can stop emitting laser beams driven by the driving signal, and during the period when the color wheel rotates to the phosphor area, the laser can emit light under the driving of the driving signal.
  • Step 806 The color wheel performs wavelength conversion on the received laser beam to emit at least one color of fluorescent primary color light.
  • the color wheel is also used to transmit the laser beam irradiated to the color wheel.
  • the implementation process of step 806, please refer to the implementation process of step 606 accordingly.
  • Step 807 The light valve modulates the received fluorescent light beam under the control of the control signal, and outputs the modulated fluorescent primary color light to the lens for imaging.
  • the light beam irradiated to the light valve is all a fluorescent light beam.
  • the light valve can reflect the fluorescent light beam according to the control signal.
  • the fluorescent light beam irradiated to the light valve is a light beam that is not needed to display an image
  • the light valve can reflect the received fluorescent light beam at a negative deflection angle, and reflect the fluorescent light beam to the light absorption device so that the fluorescent light beam cannot Irradiate to the lens for imaging.
  • the fluorescent light beam irradiated to the light valve is the light beam needed to display the image
  • the light valve can reflect the received fluorescent light beam at a positive deflection angle, and reflect the fluorescent light beam to the lens for imaging.
  • the detection device determines that there is no object to be protected in the laser projection area, it can send a second notification signal to the control system, and the second notification signal is used to notify the control system that there is no object to be protected in the laser projection area.
  • the control system acquires the image information of the image to be displayed in the storage device based on the second notification signal, and synchronously outputs the drive signal for the laser and the control signal for the light valve according to the image information, so as to realize the image information to be displayed. display.
  • the control system when it receives the first notification signal, it can also control the laser to emit a laser beam and control the light valve to reflect the laser beam to the lens for imaging. However, at this time, certain measures need to be taken to control the laser reflected to the lens.
  • the proportion of the beam For example, by reducing the brightness of the emitted laser beam, or by controlling the amount of laser reflection by the light valve, so that when the laser beam reflected to the lens is a certain value, the image formed in the lens can still meet the requirements of projection display protection Demand.
  • the implementation manner of reducing the brightness of the emitted laser beam may be: reducing the size of the driving current provided to the laser according to the image information, so as to reduce the brightness of the laser beam emitted by the laser.
  • the amplitude of the drive signal provided to the laser can be adjusted to the default value, so that the laser emits a laser beam according to the default brightness and restores the normal light-emitting process of the laser. For example, if the size of the drive current provided to the laser is reduced in the previous projection display process, at this time, the size of the drive current provided to the laser can be controlled to increase based on the second notification signal.
  • the amount of the laser beam reflected to the lens can be determined according to the national standards of laser safety level.
  • the amount of the laser beam reflected to the lens can meet the following requirements: at a distance of 1 dm from the lens, a beam with a 7 mm aperture The optical power is less than or equal to 0.039 milliwatts.
  • the amount of the laser beam reflected to the lens can be determined according to the working mode of the projection display system. That is, in different working modes, different amounts of laser light can be reflected to the lens.
  • the working mode of the projection display system may include: child mode, youth mode, day mode and night mode, etc. Each working mode can reflect a corresponding amount of laser light to the lens. When the user sets the working mode of the projection display system to child mode When, the amount corresponding to the child mode can be reflected to the lens.
  • the projection display method synchronously outputs the drive signal to the laser and the control signal to the light valve through the control system to drive the laser beam emitted by the laser to irradiate the color wheel to make the color wheel Emit fluorescent primary color light, and control the light valve to modulate the received light beam, and output the modulated fluorescent primary color light to the lens for imaging.
  • the optical power density of fluorescence is much smaller than that of laser light.
  • the fluorescent primary color light displays the image to be displayed, effectively reducing the optical power density of the beam reflected to the lens, reducing the optical power of the beam contacting the object to be protected, and effectively improving the efficiency of protecting the object to be protected .
  • the projection display method is applied to realize the human eye protection function, the efficiency of protecting the human eye can be improved.
  • control system including:
  • a memory used to store executable instructions of a processor.
  • the processor is configured to execute executable instructions in the memory to realize the function of the control system in the projection display method provided by the embodiment of the present disclosure.
  • the embodiments of the present disclosure also provide a computer-readable storage medium.
  • the computer-readable storage medium may be a non-volatile storage medium.
  • the computer-readable storage medium stores instructions. When the instructions run on the processing component, the The processing component performs the function of the control system in the projection display method provided by the embodiment of the present disclosure.
  • the embodiments of the present disclosure also provide a computer program product containing instructions.
  • the computer program product runs on a computer, the computer executes the functions of the control system in the projection display method provided by the embodiments of the present disclosure.

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Abstract

一种投影显示方法及***，属于激光投影技术领域。投影显示方法包括：当控制***（102）接收到指示激光投影区域内存在障碍物的检测信号时，根据待显示图像的图像信息，同步输出对激光器（101）的驱动信号以及对光阀（104）的控制信号，驱动信号用于驱动激光器（101）发出激光光束照射至色轮（103），以使色轮（103）发出荧光基色光；激光器（101）在驱动信号的驱动下发出激光光束；色轮（103）对接收到的激光光束进行波长转换，发出至少一种颜色的荧光基色光；光阀（104）在控制信号的控制下，对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像。有效地提高了对待保护物体进行保护的效率。

Description

投影显示方法及***
本公开要求于2019年6月20日中国专利局，申请号为201910538289.5的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及激光投影技术领域，特别涉及一种投影显示方法及***。
背景技术
随着激光技术的发展，激光投影设备的应用越来越广泛。激光投影设备包括激光投影仪和显示屏。激光投影仪根据待显示的画面，向显示屏投射激光，以在显示屏上显示画面。由于激光是一种高能光源，当激光照射到人眼时，会对人眼造成较大伤害，因此，需要在激光投影设备中配置人眼保护功能，以减小激光投影设备对人眼的伤害。
发明内容
一方面，提供了一种投影显示方法，包括：
当控制***接收到指示激光投影区域内存在障碍物的检测信号时，根据待显示图像的图像信息，同步输出对激光器的驱动信号以及对光阀的控制信号，所述驱动信号用于驱动所述激光器发出的激光光束在照射至色轮后，使所述色轮发出荧光基色光；
所述激光器在所述驱动信号的驱动下发出激光光束；
所述色轮对接收到的激光光束进行波长转换，发出至少一种颜色的荧光基色光；
所述光阀在所述控制信号的控制下，对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像。
另一方面，提供一种投影显示***，所述投影显示***包括：激光器、控制***、色轮、光阀和镜头；
所述控制***用于当接收到指示激光投影区域内存在障碍物的检测信号时，根据待显示图像的图像信息，同步输出对所述激光器的驱动信号以及对所述光阀的控制信号，所述驱动信号用于驱动所述激光器发出的激光光束在照射至所述色轮后，使所述色轮发出荧光基色光；
所述激光器用于在所述驱动信号的驱动下发出激光光束；
所述色轮用于对接收到的激光光束进行波长转换，发出至少一种颜色的荧光基色光；
所述光阀用于在所述控制信号的控制下，对接收到的光束进行调制，并将调制后的荧光基色光输出至所述镜头成像。
附图说明
为了更清楚地说明本发明的实施例，下面将对实施例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一些实施例，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，还可以根据这些附图获得其他的附图。
图1是本公开实施例提供的一种投影显示***的结构示意图。
图2是本公开实施例提供的一种色轮分区的示意图。
图3是本公开实施例提供的另一种投影显示***的结构示意图。
图4是本公开实施例提供的一种信号处理单元的结构示意图。
图5是本公开实施例提供的一种投影显示方法的流程图。
图6是本公开实施例提供的另一种投影显示方法的流程图。
图7是本公开实施例提供的一种待显示图像的示意图。
图8是本公开实施例提供的再一种投影显示方法的流程图。
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。
具体实施方式
为了使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开作进一步地详细描述，显然，所描述的实施例仅仅是本公开一部份实施例，而不是全部的实施例。基于本公开中的实施例，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它实施例，都属于本公开保护的范围。
图1是本公开实施例提供的投影显示方法所涉及的投影显示***10的示意图，如图1所示，该***包括：激光器101、控制***102、色轮103、光阀104和镜头105。
控制***102用于当接收到指示激光投影区域内存在障碍物的检测信号时，根据待显示图像的图像信息，同步输出对激光器101的驱动信号以及对光阀104的控制信号，驱动信号用于驱动激光器101发出激光光束以照射至色轮103使色轮103发出荧光基色光。其中，检测信号用于指示激光器101的激光投影区域内存在待保护物体。
激光器101用于在驱动信号的驱动下发出激光光束。例如，激光器101用于发出至少一种颜色的激光光束。
色轮103用于对接收到的激光光束进行波长转换，发出至少一种颜色的荧光基色光。
光阀104用于在控制信号的控制下，对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头105成像。
在一些实施例中，色轮103还用于透射照射至色轮103的激光光束。例如，色轮103具有荧光区和激光透射区。该荧光区中设置有荧光粉，当激光光束照射至荧光区时，激光光束能够激发该荧光区中的荧光粉发出对应颜色的荧光。当激光光束照射至激光透射区时，激光光束会被透射。在投影显示过程中，通过将荧光轮设置于激光的传播路径上，并控制荧光轮旋转，使得激光器101发出的激光光束轮流且周期性地照射至荧光轮的不同区域，能够使激光器101时序性地输出颜色为荧光轮被照射的区域对应颜色的光束。
示例地，激光器101可以发出蓝色的激光，如图2所示，色轮103具有绿色荧光区、红色荧光区和激光透射区，绿色荧光区中设置有绿色荧光粉，红色荧光区中设置有红色荧光粉。当激光器101发出的蓝色激光光束照射至绿色荧光区中的绿色荧光粉时，该绿色荧光粉在该蓝色激光光束的激发下，能够发出绿色的荧光。当蓝色激光光束照射至红色荧光区中的红色荧光粉时，该红色荧光粉在该蓝色激光光束的激发下，能够发出红色的荧光。当蓝色激光光束照射至激光透射区时，该蓝色激光光束会被透射出。
在投影显示保护的一种可实现方式中，从色轮103发射出的光束可以包括 激光光束和荧光光束，此时，可以通过控制***102控制光阀104以实现投影显示保护功能。
也即是，当色轮103发出荧光光束至光阀104时，光阀104可以在控制信号的控制下，对接收到的荧光光束以正偏转角度进行反射。当色轮103透射激光光束至光阀104时，光阀104还用于在控制信号的控制下，对接收到的激光光束以负偏转角度进行反射。
并且，还可以通过光阀104对照射至光阀104表面的光束进行筛选，以将显示图像所需的光束反射至镜头105。例如，当控制***102确定照射至光阀104的光束为显示图像所需的光束时，控制***102可以控制该光阀104对接收到的光束以正偏转角度进行反射，将该光束反射至镜头105成像，进而实现图像显示。当控制***102确定照射至光阀104的光束为显示图像不需要的光束时，控制***102可以控制该光阀104对接收到的光束以负偏转角度进行反射，将该光束反射至光吸收装置，使得该光束无法照射至镜头105成像。
在投影显示保护的另一种可实现方式中，由于激光器101的发光过程可以通过控制***102控制，此时，控制***102可以向激光器101提供停止发光的驱动信号，使得激光器101在该驱动信号的驱动下停止发光。或者，也可以向激光器101提供减小幅值后的驱动信号，以减小激光器101发出的激光光束的亮度。从而能够减小因激光器发光所消耗的能耗。
具体的，激光器101出光与色轮103旋转同步，当色轮103旋转至激光透射区的时段内，控制***102可以向激光器101提供停止发光的驱动信号，以驱动激光器101停止发光。或者，在该时段内，控制***102也可以不向激光器101提供驱动信号，使得激光器101能够停止发出激光。或者，在该时段内，控制***102也可以向激光器101提供减小幅值后的驱动信号，以减小激光器101发出的激光光束的亮度。
在一些实施例中，当从色轮103发出的光束的颜色包括红色、绿色和蓝色时，控制***102可以分别向激光器101提供针对红色光束的驱动信号、针对绿色光束的驱动信号和针对蓝色光束的驱动信号。控制***102用于向激光器101提供针对红色光束的驱动信号的时间，与该激光器101发出的激光光束照射至色轮103中红色荧光区域的时间同步，控制***102用于向激光器101提供针对绿色光束的驱动信号的时间，与该激光器101发出的激光光束照射至色轮 103中绿色荧光区域的时间同步，控制***102用于向激光器101提供针对蓝色光束的驱动信号的时间，与该激光器101发出的激光光束照射至色轮103中激光透射区的时间同步。在一些实施例中，如图3所示，控制***102可以包括：控制装置1021和驱动装置1022。控制装置1021用于根据显示需求向驱动装置1022发送控制信号，该控制信号中可以携带有激光器101的投影参数。可选地，该投影参数可以为发光亮度等。驱动装置1022用于根据接收到的控制信号中携带的发光参数，向激光器101提供驱动信号。其中，该驱动信号可以为驱动电流。
如图3所示，驱动装置1022可以包括多个驱动模块，该多个驱动模块用于向激光器101提供针对不同颜色的光束的驱动信号。例如，该驱动装置1022可以包括：针对红色光束的驱动模块、针对绿色光束的驱动模块和针对蓝色光束的驱动模块。红色驱动模块用于向激光器101提供针对红色光束的红色驱动信号，绿色驱动模块用于向激光器101提供蓝色光束的蓝色驱动信号。
并且，各个颜色的驱动信号与色轮103的同步可以通过信号选通功能实现。例如，控制装置1021和驱动装置1022之间可以串联有选通电路，选通电路中可以至少设置三个开关子电路，每个开关子电路分别与色轮103的一个区域对应。每个开关子电路均具有控制端、输入端和输出端，控制装置1021可以分别向三个开关子电路的输入端发送红色控制信号、绿色控制信号和蓝色控制信号，该每种颜色的控制信号中携带有对应颜色的投影参数，控制装置1021可以分别向该三个开关子电路的控制端发送红色选择信号、绿色选择信号和蓝色选择信号，且该三种颜色的选择信号在同一时刻仅有一个选择信号处于有效电平，即同一时刻仅有一个开关子电路能够通过输出端向驱动装置1022输出对应颜色的控制信号，驱动装置1022根据该对应颜色的控制信号中携带的投影参数，向激光器101提供与该投影参数对应的驱动信号，以驱动激光器101发出符合该投影参数的激光。其中，选择信号处于有效电平的时段与激光光束照射至色轮103中对应颜色的区域的时段重合。
进一步地，如图3所示，该投影显示***还可以包括：存储装置106，该存储装置106中可以存储有待显示图像的图像信息等。相应的，控制***102还可以包括：多媒体处理单元1023。在需要显示图像时，多媒体处理单元1023可以从该存储装置106中获取待显示图像的图像信息，并向控制装置1021发送该 图像信息，以供控制装置1021根据该图像信息向光阀104或驱动装置1022发送控制信号，以实现该图像的显示。
其中，待显示图像可以为根据实际需要确定的图像。例如，在投影显示***实现人眼保护功能时，该待显示图像可以为用于提示用户该投影显示***处于人眼保护模式下的图像，控制***102在确定激光投影区域内存在待保护物体(如人)时，可以从该存储装置106中获取待显示图像的图像信息，并根据该待显示图像的图像信息对光阀104进行控制，以在镜头105上成像该待显示图像，进而提示用户该投影显示***处于人眼保护模式下。
可选地，为保证投影显示功能的有效实现，待显示图像的基色分量的颜色可以与激光器101发出的激光光束的颜色不同。下面以以下两种示例对其实现方式进行说明：
在一种示例中，该待显示图像的基色分量为一种荧光基色光。
该待显示图像可以包括图案区域和其他区域，该其他区域为该待显示图像中除图案区域外的区域。该图案区域中具有提示图案，该荧光基色光用于显示提示图案。可选地，该提示图案可以为文字或图标。且由于荧光的光功率密度远小于激光的光功率密度，使得荧光对人眼造成的伤害远小于激光对人眼造成的伤害，因此，当待显示图像的基色分量为一种荧光基色光时，既能够实现提示功能，还能够有效减小对人眼造成的伤害。
并且，该其他区域中像素点的像素值可以均小于该提示图案中像素点的像素值。例如，该其他区域中的像素点的灰阶可以均为低灰阶，使得该其他区域中的像素点呈现为黑色或暗色。这样一来，既能够实现提示功能，又能够减小对人眼造成的伤害，还能够有效减小控制***102的显示能耗。
示例地，激光器101用于发出蓝色的激光光束，此时，待显示图像的基色分量可以为绿色的荧光基色光，此时，该绿色的荧光基色光用于显示待显示图像中的提示图案，且其他区域中的像素点均呈现为黑色。
在另一种示例中，待显示图像的基色分量可以由两种荧光基色光组成，且待显示图像可以由提示图案和背景图案组成，该两种荧光基色光中的一种用于显示提示图案，该两种荧光基色光中的另一种用于显示背景图案。
在一些实施例中，待显示图像的基色分量也可以包括激光光束，但该激光光束在待显示图像的基色分量中的占比很小。且该占比可以通过减小发出的激 光光束的亮度，或者，可以通过控制光阀104对激光反射的量，使得当反射至镜头105的激光光束为一定值时，在镜头105中成像的图像仍能够满足投影显示保护的需求。其中，减小发出的激光光束的亮度的实现方式可以为：根据图像信息减小向激光器101提供的驱动电流的大小，以减小激光器101发出的激光光束的亮度。
其中，反射至镜头105的激光光束的量可以根据激光安全等级的国家标准确定，例如，反射至镜头105的激光光束的量可以满足：在距离镜头1051分米处，7毫米的孔径斑斓的光束的光功率小于或等于0.039毫瓦。或者，反射至镜头105的激光光束的量可以根据投影显示***的工作模式确定。也即是，不同的工作模式下，可以将不同量的激光反射至镜头105。例如，投影显示***的工作模式可以包括：儿童模式、青年模式、白天模式和夜晚模式等，在每个工作模式下可以反射对应量的激光至镜头105，当用户设置投影显示***的工作模式为儿童模式时，可以将该儿童模式对应的量反射至镜头105。
在一些实施例中，如图3所示，该投影显示***还可以包括：光机照明装置107和光学通路108。光机照明装置107设置在色轮103和光阀104之间，用于将色轮103发出的光束投射至光阀104。光学通路108设置在光阀104和镜头105之间，用于对被光阀104反射的光束阵列进行整形约束，使得经过整形约束的光束阵列具有一定形状。例如，当待显示图像呈矩形时，可将由光阀104反射的光束阵列进行整形，以得到呈矩形的光束阵列，使得显示出的图像呈矩形。
在一些实施例中，该投影显示***可以为数字光学处理(digital light processing,DLP)***，相应的，投影显示***可以包括：微镜装置。该微镜装置可以为数字微镜装置(digital micromirror device，DMD)，该DMD可以包括阵列排布的多个光阀104(也称微镜片)，该多个光阀104可以与待显示图像中的多个像素点对应。通常的，多个光阀104和多个像素点一一对应。
进一步地，如图3所示，该投影显示***还可以包括：检测装置109。检测装置109用于检测激光器101的激光投影区域内是否存在待保护物体，并在确定激光投影区域内存在待保护物体时，向控制***发送用于指示激光投影区域内存在障碍物的检测信号。其中，该待保护物体可以为人。
在一些实施例中，当待保护物体为目标活体(例如人)时，如图3所示，该检测装置109可以包括：传感器单元1091、信号处理单元1092和信号逻辑单 元1093。
传感器单元1091用于检测激光投影区域内是否存在红外信号，将检测到的红外信号转换为电信号，并将该电信号发送至信号处理单元1092。信号处理单元1092用于对该电信号依次进行放大处理、比较处理和逻辑处理得到脉冲信号，并将该脉冲信号发送至信号逻辑单元1093。其中，该逻辑处理可以为逻辑或处理。
由于传感器单元1091发送的电信号的大小通常为几毫伏(mv)，若直接将该电信号发送至信号逻辑单元1093，信号逻辑单元1093可能无法识别该电信号，因此，在将该电信号发送至信号逻辑单元1093之前，通过信号处理单元1092该电信号进行放大等一系列处理操作，能够使信号逻辑单元1093有效识别并处理该电信号，提高检测的准确性。
信号逻辑单元1093用于基于该脉冲信号判断激光投影区域内是否存在目标活体，并在激光投影区域内存在目标活体时，向控制***102发送有效电平信号。该有效电平信号即为用于指示激光投影区域内存在障碍物的检测信号。
示例地，请参考图4，该信号处理单元1092可以包括：放大模块1092a、比较模块1092b和逻辑模块1092c。放大模块1092a用于对电信号进行放大处理，如图4所示，传感器单元1091发送的电信号为信号A，放大模块1092a对该信号A进行整体放大后得到信号B。其中，信号A的最大值为2mv，放大后的信号B的最大值为2.5v。信号A的最小值为0.5mv，放大后的信号B的最小值为0.5v。
比较模块1092b中存储有高电压阈值和低电压阈值，比较模块1092b可以将放大后的电信号在不同时刻的幅值的绝对值分别与高电压阈值和低电压阈值进行比较，得到两个脉冲信号。如图4所示，比较模块1092b中设置有高电压阈值a1和低电压阈值a2，将信号B在不同时刻的幅值的绝对值与高电压阈值a1进行比较，可得到脉冲信号C。其中，当信号B在某时刻的幅值的绝对值大于高电压阈值a1时，脉冲信号C在该时刻电平为高电平，当信号B在某时刻的幅值绝对值小于高电压阈值a1时，脉冲信号C在该时刻电平为低电平。将信号B在不同时刻的幅值的绝对值与低电压阈值a2进行比较，得到脉冲信号D。其中，当信号B在某时刻的幅值的绝对值大于低电压阈值a2时，脉冲信号D在该时刻电平为高电平，当信号B在某时刻的幅值的绝对值小于a2时，脉冲信号D 在该时刻电平为低电平。
逻辑模块1092c可以对比较模块1092b输出的两个脉冲信号进行逻辑或操作，以得到一个脉冲信号。示例地，如图4所示，逻辑模块1092c可以对脉冲信号C和脉冲信号D进行逻辑或操作，得到脉冲信号E。
在一些实施例中，信号逻辑单元1093在接收到信号处理单元1092发送的脉冲信号后，可以统计该脉冲信号在单位时间周期内脉冲的个数，并将该脉冲个数与参考个数阈值进行比较，当该个数大于或者等于参考个数阈值时，信号逻辑单元1093确定激光投影区域内存在目标活体，并向控制***102发送通知信号。当该个数小于参考个数阈值时，信号逻辑单元1093确定激光投影区域内不存在目标活体，不向控制***102发送通知信号。可选地，该参考个数阈值可以基于目标活体发出的红外线的能量确定。
或者，信号逻辑单元1093可以在接收到一个脉冲后，检测在参考时长内是否接收到另一个脉冲，若在参考时长内接收到另一个脉冲，确定激光投影区域内存在目标活体，并向控制***102发送通知信号，若在参考时长内未接收到另一个脉冲，确定激光投影区域内不存在目标活体，不向控制***102发送通知信号。其中，该参考时长可以根据实际需要确定，例如，该参考时长可以为3秒。
下面对本公开实施例提供的投影显示方法进行说明。该方法可以应用于本公开实施例提供的投影显示***。图5为本公开实施例提供的一种投影显示方法的流程图，请参考图5，该方法包括：
步骤501、当控制***接收到指示激光投影区域内存在障碍物的检测信号时，根据待显示图像的图像信息，同步输出对激光器的驱动信号以及对光阀的控制信号。
其中，驱动信号用于驱动激光器发出的激光光束在照射至色轮后，使色轮发出荧光基色光。控制信号用于控制光阀对光束的反射角度。
步骤502、激光器在驱动信号的驱动下发出激光光束。
步骤503、色轮对接收到的激光光束进行波长转换，发出至少一种颜色的荧光基色光。
步骤504、光阀在控制信号的控制下，对接收到的光束进行调制，并将调制 后的荧光基色光输出至镜头成像。
综上所述，本公开实施例提供的投影显示方法，通过控制***同步输出对激光器的驱动信号以及对光阀的控制信号，以驱动激光器发出的激光光束在照射至色轮后，使色轮发出荧光基色光，并控制光阀对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像，相较于相关技术，由于荧光的光功率密度远小于激光的光功率密度，通过该荧光基色光显示待显示图像，有效地减小了反射至镜头的光束的光功率密度，减小了待保护物体接触到的光束的光功率，有效地提高了对待保护物体进行保护的效率。当该投影显示方法应用于实现人眼保护功能时，能够提高对人眼进行保护的效率。
图6为本公开实施例提供的另一种投影显示方法的流程图，该方法可以应用于本公开实施例提供的投影显示***，该方法通过控制光阀对光束的反射方向，实现投影显示保护功能。请参考图6，该方法可以包括：
步骤601、检测装置检测激光投影区域内是否存在待保护物体。
其中，该步骤601的实现方式请相应参考前述投影显示***中检测装置检测待保护物体的实现方式。
步骤602、检测装置在确定激光投影区域内存在待保护物体时，向控制***发送第一通知信号。
该第一通知信号用于通知控制***激光投影区域内存在待保护物体。
步骤603、控制***基于第一通知信号，在存储装置中获取待显示图像的图像信息。
其中，待显示图像可以为根据实际需要确定的图像。例如，在投影显示***实现人眼保护功能时，该待显示图像可以为用于提示用户该投影显示***处于人眼保护模式下的图像，控制***在确定激光投影区域内存在待保护物体(如人)时，可以从该存储装置105中获取待显示图像的图像信息，并根据该待显示图像的图像信息对光阀进行控制，以实现该待显示图像的显示，进而提示用户该投影显示***处于人眼保护模式下。
可选地，为保证投影显示功能的有效实现，待显示图像的基色分量的颜色可以与激光器发出的激光光束的颜色不同。面以以下两种示例对其实现方式进行说明：
在一种示例中，该待显示图像的基色分量为一种荧光基色光。
该待显示图像可以包括图案区域和其他区域，该其他区域为该待显示图像中除图案区域外的区域。该图案区域中具有提示图案，该荧光基色光用于显示提示图案。可选地，该提示图案可以为文字或图标。由于荧光的光功率密度远小于激光的光功率密度，使得荧光对人眼造成的伤害远小于激光对人眼造成的伤害，因此，当待显示图像的基色分量为一种荧光基色光时，既能够实现提示功能，还能够有效减小对人眼造成的伤害。
并且，该其他区域中像素点的像素值可以均小于该提示图案中像素点的像素值。例如，该其他区域中的像素点的灰阶可以均为低灰阶，使得该其他区域中的像素点呈现为黑色或暗色。这样一来，既能够实现提示功能，又能够减小对人眼造成的伤害，还能够有效减小控制***得显示能耗。如图7所示，图7中斜线填充区域的显示颜色为荧光绿色，其他区域的显示颜色均为黑色。
示例地，激光器用于发出蓝色的激光光束，此时，待显示图像的基色分量可以为绿色的荧光基色光，即该绿色的荧光基色光用于显示待显示图像中的提示图案，且其他区域中的像素点均呈现为黑色。
在另一种示例中，待显示图像的基色分量由两种荧光基色光组成，待显示图像由提示图案和背景图案组成，两种荧光基色光中的一种用于显示提示图案，两种荧光基色光中的另一种用于显示背景图案。
在一些实施例中，待显示图像的基色分量也可以包括激光光束，但该激光光束在待显示图像的基色分量中的占比很小。且该占比可以通过减小发出的激光光束的亮度，或者，可以通过控制光阀对激光反射的量，使得当反射至镜头的激光光束为一定值时，在镜头中成像的图像仍能够满足投影显示保护的需求。其中，减小发出的激光光束的亮度的实现方式可以为：根据图像信息减小向激光器提供的驱动电流的大小，以减小激光器发出的激光光束的亮度。
其中，反射至镜头的激光光束的量可以根据激光安全等级的国家标准确定，例如，反射至镜头的激光光束的量可以满足：在距离镜头1分米处，7毫米的孔径斑斓的光束的光功率小于或等于0.039毫瓦。或者，反射至镜头的激光光束的量可以根据投影显示***的工作模式确定。也即是，不同的工作模式下，可以将不同量的激光反射至镜头。例如，投影显示***的工作模式可以包括：儿童模式、青年模式、白天模式和夜晚模式等，在每个工作模式下可以反射对应量的激光至镜头，当用户设置投影显示***的工作模式为儿童模式时，可以将该 儿童模式对应的量反射至镜头。
步骤604、控制***根据待显示图像的图像信息，同步输出对激光器的驱动信号以及对光阀的控制信号。
驱动信号用于驱动激光器发出激光光束。该驱动信号可以根据待显示的图像的图像信息确定。例如，该驱动信号可以为驱动电流，可以根据图像信息中像素点的像素值确定驱动电流的幅值。
控制信号用于控制光阀对接收到的信号进行反射的反射方向。并且，该控制信号可以根据第一通知信号和图像信息确定。例如，当控制***接收到第一通知信号时，该控制信号用于指示光阀对接收到的激光光束以负偏转角度进行反射，将该激光光束反射至光吸收装置，使得该光束无法照射至镜头成像。当控制***未接收到第一通知信号，且根据图像信息确定照射至光阀的光束为显示图像不需要的光束时，该控制信号用于指示光阀对接收到的激光光束以负偏转角度进行反射，将该激光光束反射至光吸收装置，使得该光束无法照射至镜头成像。当控制***未接收到第一通知信号，且根据图像信息确定照射至光阀的光束为显示图像需要的光束时，该控制信号用于指示光阀对接收到的激光光束以正偏转角度进行反射，将该激光光束反射至镜头成像。
步骤605、激光器在驱动信号的驱动下发出激光光束。
步骤606、色轮对接收到的激光光束进行波长转换，至少发出一种颜色的荧光基色光。
激光器发出的激光光束在照射至色轮后，色轮可对接收到的激光光束进行波长转换，并至少发出一种颜色的荧光基色光。并且，例如，色轮还可以透射照射至色轮的激光光束。色轮可以具有两个荧光区和一个激光投射区，此时，色轮可以对照射至荧光区的激光光束进行进行波长转换，并发出荧光区对应颜色的荧光基色光，且色轮可以透射照射至激光透射区的激光光束。
步骤607、光阀在控制信号的控制下，对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像。
色轮发出的光束在经过光机照明装置后，可以照射至光阀，此时，光阀可以根据接收到的控制信号，对接收到的光束进行调制，并反射调制后的光束。由光阀反射的光束可以照射至光学通路，并经过光学通路整形约束后照射至镜头成像。
其中，当照射至光阀的光束为激光光束时，为了保证投影显示保护功能的有效实现，光阀可以在控制信号的控制下，对接收到的激光光束以负偏转角度进行反射，使得该激光光束无法照射至镜头成像。相应的，当照射至光阀的光束为荧光基色光光束时，光阀可以在控制信号的控制下，对接收到的荧光基色光光束以正偏转角度进行反射，使得该激光光束照射至镜头成像。
需要说明的是，在检测装置在确定激光投影区域内不存在待保护物体时，可以向控制***发送第二通知信号，该第二通知信号用于通知控制***激光投影区域内不存在待保护物体。此时，控制***基于第二通知信号，在存储装置中获取待显示图像的图像信息，并根据该图像信息同步输出对激光器的驱动信号以及对光阀的控制信号，以实现该待显示图像的显示。
综上所述，本公开实施例提供的投影显示方法，通过控制***同步输出对激光器的驱动信号以及对光阀的控制信号，以驱动激光器发出的激光光束在照射至色轮后，使色轮发出荧光基色光，并控制光阀对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像，相较于相关技术，由于荧光的光功率密度远小于激光的光功率密度，通过该荧光基色光显示待显示图像，有效地减小了反射至镜头的光束的光功率密度，减小了待保护物体接触到的光束的光功率，有效地提高了对待保护物体进行保护的效率。当该投影显示方法应用于实现人眼保护功能时，能够提高对人眼进行保护的效率。
图8为本公开实施例提供的另一种投影显示方法的流程图，该方法可以应用于本公开实施例提供的投影显示***，该方法通过向激光器提供不同的驱动信号，实现投影显示保护功能。请参考图8，该方法可以包括：
步骤801、检测装置检测激光投影区域内是否存在待保护物体。
其中，该步骤801的实现方式请相应参考前述投影显示***中检测装置检测待保护物体的实现方式。
步骤802、检测装置在确定激光投影区域内存在待保护物体时，向控制***发送第一通知信号。
该第一通知信号用于通知控制***激光投影区域内存在待保护物体。
步骤803、控制***基于第一通知信号，在存储装置中获取待显示图像的图像信息。
该步骤803的实现方式请相应参考前述步骤603的实现方式。
步骤804、控制***根据待显示图像的图像信息，同步输出对激光器的驱动信号以及对光阀的控制信号。
驱动信号用于驱动激光器发出的激光光束。该驱动信号可以根据第一通知信号确定。例如，在色轮旋转至激光透射区的时段内，控制***可以向激光器提供使激光器停止发光的驱动信号，以驱动激光器停止发光。或者，在该时段内，控制***也可以不向激光器提供驱动信号，使得激光器能够停止发光。
控制信号用于控制光阀对接收到的信号进行反射的反射方向。并且，该控制信号可以根据图像信息确定。例如，当根据图像信息确定照射至光阀的光束为显示图像不需要的光束时，该控制信号用于指示光阀对接收到的激光光束以负偏转角度进行反射，将该激光光束反射至光吸收装置，使得该光束无法照射至镜头成像。当根据图像信息确定照射至光阀的光束为显示图像需要的光束时，该控制信号用于指示光阀对接收到的激光光束以正偏转角度进行反射，将该激光光束反射至镜头成像。
步骤805、激光器在驱动信号的驱动下发出或者不发出激光光束。
在色轮旋转至激光透射区的时段内，激光器可以在驱动信号的驱动下停止发出激光光束，在色轮旋转至荧光区的时段内，激光器可以在驱动信号的驱动下发光。
步骤806、色轮对接收到的激光光束进行波长转换，至少发出一种颜色的荧光基色光。
其中，色轮还用于透射照射至色轮的激光光束。该步骤806的实现过程请相应参考步骤606的实现过程。
步骤807、光阀在控制信号的控制下，对接收到的荧光光束进行调制，并将调制后的荧光基色光输出至镜头成像。
当通过驱动信号控制激光器停止发出激光光束时，照射至光阀的光束均为荧光光束，此时，光阀可以根据控制信号对荧光光束进行反射。例如，当照射至光阀的荧光光束为显示图像不需要的光束时，光阀可以对接收到的荧光光束以负偏转角度进行反射，将该荧光光束反射至光吸收装置，使得该荧光光束无法照射至镜头成像。当照射至光阀的荧光光束为显示图像需要的光束时，光阀可以对接收到的荧光光束以正偏转角度进行反射，将该荧光光束反射至镜头成 像。
需要说明的是，在检测装置在确定激光投影区域内不存在待保护物体时，可以向控制***发送第二通知信号，该第二通知信号用于通知控制***激光投影区域内不存在待保护物体。此时，控制***基于第二通知信号，在存储装置中获取待显示图像的图像信息，并根据该图像信息同步输出对激光器的驱动信号以及对光阀的控制信号，以实现该待显示图像的显示。
并且，当控制***接收到第一通知信号时，也可以控制激光器发出激光光束，并控制光阀将该激光光束反射至镜头成像，但是，此时需要采取一定的措施，控制反射至镜头的激光光束的占比。例如，可以通过减小发出的激光光束的亮度，或者，通过控制光阀对激光反射的量，使得当反射至镜头的激光光束为一定值时，在镜头中成像的图像仍能够满足投影显示保护的需求。其中，减小发出的激光光束的亮度的实现方式可以为：根据图像信息减小向激光器提供的驱动电流的大小，以减小激光器发出的激光光束的亮度。
相应的，当激光投影区域中不存在待保护物体时，可以将向激光器提供的驱动信号的幅值调整为默认值，使得激光器按照默认亮度发出激光光束，恢复激光器的正常发光过程。例如，若在之前的投影显示过程中减小了向激光器提供的驱动电流的大小，此时，可以基于该第二通知信号控制增大向激光器提供的驱动电流的大小。
可选地，反射至镜头的激光光束的量可以根据激光安全等级的国家标准确定，例如，反射至镜头的激光光束的量可以满足：在距离镜头1分米处，7毫米的孔径斑斓的光束的光功率小于或等于0.039毫瓦。或者，反射至镜头的激光光束的量可以根据投影显示***的工作模式确定。也即是，不同的工作模式下，可以将不同量的激光反射至镜头。例如，投影显示***的工作模式可以包括：儿童模式、青年模式、白天模式和夜晚模式等，每个工作模式在可以反射对应量的激光至镜头，当用户设置投影显示***的工作模式为儿童模式时，可以将该儿童模式对应的量反射至镜头。
综上所述，本公开实施例提供的投影显示方法，通过控制***同步输出对激光器的驱动信号以及对光阀的控制信号，以驱动激光器发出的激光光束在照射至色轮后，使色轮发出荧光基色光，并控制光阀对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像，相较于相关技术，由于荧光的光功 率密度远小于激光的光功率密度，通过该荧光基色光显示待显示图像，有效地减小了反射至镜头的光束的光功率密度，减小了待保护物体接触到的光束的光功率，有效地提高了对待保护物体进行保护的效率。当该投影显示方法应用于实现人眼保护功能时，能够提高对人眼进行保护的效率。
需要说明的是，本公开实施例提供的投影显示方法的方法步骤的先后顺序可以进行适当调整，步骤也可以根据情况进行相应增减，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化的方法，都应涵盖在本申请的保护范围之内，因此不再赘述。
本公开实施例还提供了一种控制***，包括：
处理器。
用于存储处理器的可执行指令的存储器。
其中，处理器被配置为：执行存储器中的可执行指令，以实现如本公开实施例提供的投影显示方法中控制***的功能。
本公开实施例还提供了一种计算机可读存储介质，该计算机可读存储介质可以为非易失性存储介质，计算机可读存储介质中存储有指令，当指令在处理组件上运行时，使得处理组件执行如本公开实施例提供的投影显示方法中控制***的功能。
本公开实施例还提供了一种包含指令的计算机程序产品，当计算机程序产品在计算机上运行时，使得计算机执行本公开实施例提供的投影显示方法中控制***的功能。
本领域技术人员在考虑说明书及实践这里公开的公开后，将容易想到本公开的其它实施方案。本申请旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由权利要求指出。
应当理解的是，本公开并不局限于上面已经描述并在附图中示出的精确结 构，并且可以在不脱离其范围进行各种修改和改变。本公开的范围仅由所附的权利要求来限制。

Claims (20)

  1. 一种投影显示方法，包括：
    当控制***接收到指示激光投影区域内存在障碍物的检测信号时，根据待显示图像的图像信息，同步输出对激光器的驱动信号以及对光阀的控制信号，所述驱动信号用于驱动所述激光器发出激光光束照射至所述色轮以使所述色轮发出荧光基色光；
    所述激光器在所述驱动信号的驱动下发出激光光束；
    所述色轮对接收到的激光光束进行波长转换，发出至少一种颜色的荧光基色光；
    所述光阀在所述控制信号的控制下，对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像。
  2. 根据权利要求1所述的方法，包括：
    所述光阀在所述控制信号的控制下，对接收到的荧光光束以正偏转角度进行反射。
  3. 根据权利要求1所述的方法，所述色轮还用于透射照射至所述色轮的激光光束。
  4. 根据权利要求3所述的方法所述光阀在所述控制信号的控制下，对接收到的光束进行调制，包括：
    所述光阀在所述控制信号的控制下，对接收到的激光光束以负偏转角度进行反射。
  5. 根据权利要求3所述的方法，还包括：
    所述控制***向所述激光器发送停止发光的驱动信号，以驱动所述激光器停止发光。
  6. 根据权利要求3所述的方法，还包括：
    所述控制***向所述激光器发送指示亮度减小的驱动信号，以使所述激光器发出亮度减小的激光光束。
  7. 根据权利要求1至6任一所述的方法，所述待显示图像的基色分量的颜色与所述激光器发出的激光光束的颜色不同。
  8. 根据权利要求7所述的方法，所述待显示图像的基色分量为一种荧光基色光，所述待显示图像包括提示图案，所述所述荧光基色光用于显示所述提示图案；
    或者，所述待显示图像的基色分量由两种荧光基色光组成，所述待显示图像由提示图案和背景图案组成，所述两种荧光基色光中的一种用于显示所述提示图案，所述两种荧光基色光中的另一种用于显示所述背景图案。
  9. 根据权利要求8所述的方法，所述激光器发出蓝色的激光光束，所述待显示图像的基色分量为绿色的荧光基色光。
  10. 根据权利要求1至6任一所述的方法，所述检测信号用于指示所述激光器的激光投影区域内存在待保护物体。
  11. 一种投影显示***，包括：
    控制***，用于当接收到到指示激光投影区域内存在障碍物的检测信号时，根据待显示图像的图像信息，同步输出对激光器的驱动信号以及对光阀的控制信号，所述驱动信号用于驱动所述激光器发出激光光束照射至所述色轮以使所述色轮发出荧光基色光；
    激光器，用于在所述驱动信号的驱动下发出激光光束；
    色轮，用于对接收到的激光光束进行波长转换，发出至少一种颜色的荧光基色光；
    光阀，用于在所述控制信号的控制下，对接收到的光束进行调制，并将调制后的荧光基色光输出至镜头成像；
    镜头，用于基于接收到的调制后的荧光基色光进行成像
  12. 根据权利要求11所述的***，所述光阀用于，
    在所述控制信号的控制下，对接收到的荧光光束以正偏转角度进行反射。
  13. 根据权利要求11所述的***，所述色轮还用于透射照射至所述色轮的激光光束。
  14. 根据权利要求13所述的***，所述光阀还用于在所述控制信号的控制 下，对接收到的激光光束以负偏转角度进行反射。
  15. 根据权利要求13所述的***，所述控制***还用于，
    向所述激光器发送停止发光的驱动信号，以驱动所述激光器停止发光。
  16. 根据权利要求15所述的***，所述控制***还用于，
    向所述激光器发送指示亮度减小的驱动信号，以使所述激光器发出零度减小的激光光束。
  17. 根据权利要求11至16任一所述的***，所述待显示图像的基色分量的颜色与所述激光器发出的激光光束的颜色不同。
  18. 根据权利要求17所述的***，所述待显示图像的基色分量为一种荧光基色光，所述待显示图像包括提示图案，所述所述荧光基色光用于显示所述提示图案；
    或者，所述待显示图像的基色分量由两种荧光基色光组成，所述待显示图像由提示图案和背景图案组成，所述两种荧光基色光中的一种用于显示所述提示图案，所述两种荧光基色光中的另一种用于显示所述背景图案。
  19. 根据权利要求18所述的***，所述激光器发出蓝色的激光光束，所述待显示图像的基色分量为绿色的荧光基色光。
  20. 根据权利要求11至16任一所述的***，所述检测信号用于指示所述激光器的激光投影区域内存在待保护物体。
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