CN112114478B - Projection display method and system - Google Patents
Projection display method and system Download PDFInfo
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- CN112114478B CN112114478B CN201910538289.5A CN201910538289A CN112114478B CN 112114478 B CN112114478 B CN 112114478B CN 201910538289 A CN201910538289 A CN 201910538289A CN 112114478 B CN112114478 B CN 112114478B
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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
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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
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- 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
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- 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]
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- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
The invention relates to a projection display method and a projection display system, and belongs to the technical field of laser projection. The method comprises the following steps: when the control system receives a detection signal indicating that an obstacle exists in a laser projection area, a driving signal for the laser and a control signal for the light valve are synchronously output according to image information of an image to be displayed, and the driving signal is used for driving a laser beam emitted by the laser to irradiate the color wheel so as to enable the color wheel to emit fluorescent primary light; the laser emits laser beams under the driving of the driving signal; the color wheel performs wavelength conversion on the received laser beam and at least emits fluorescent primary color light of one color; and the light valve modulates the received light beam under the control of the control signal and outputs the modulated fluorescence primary color light to the lens for imaging. The invention effectively improves the efficiency of protecting the object to be protected.
Description
Technical Field
The invention relates to the technical field of laser projection, in particular to a projection display method and system.
Background
With the development of laser technology, the application of laser projection equipment is more and more extensive. The laser projection apparatus includes a laser projector and a display screen. The laser projector may transmit laser light to the display screen according to a picture to be displayed to display the picture on the display screen. Since laser is a high-energy light source, when the laser irradiates the eyes, the eyes are damaged greatly, and therefore, a human eye protection function needs to be configured in the laser projection device to reduce the damage of the laser projection device to the eyes.
At present, the realization process of the eye protection function is as follows: when the laser projector detects that a person is in the laser projection area, the brightness of the light beam emitted by the laser light source is adjusted to reduce the brightness of the light beam contacted by the human eyes, and then the human eye protection function is realized.
However, the light beam with reduced brightness still has a large stimulation to human eyes, resulting in a low efficiency of the human eye protection function.
Disclosure of Invention
The embodiment of the invention provides a projection display method and a projection display system, which can solve the problem that laser projection equipment in the related art has low efficiency of realizing a human eye protection function. The technical scheme is as follows:
according to a first aspect of the embodiments of the present invention, there is provided a projection display method applied to a projection display system, the projection display system including: laser, control system, colour wheel, light valve and camera lens, the method includes:
when the control system receives a detection signal indicating that an obstacle exists in a laser projection area, a driving signal for the laser and a control signal for the light valve are synchronously output according to image information of an image to be displayed, and the driving signal is used for driving a laser beam emitted by the laser to irradiate the color wheel so as to enable the color wheel to emit fluorescent primary light;
the laser emits laser beams under the driving of the driving signal;
the color wheel performs wavelength conversion on the received laser beam and at least emits fluorescent primary color light of one color;
and the light valve modulates the received light beam under the control of the control signal and outputs the modulated fluorescence primary color light to the lens for imaging.
Optionally, the color wheel is further configured to transmit a laser beam irradiated to the color wheel, and the light valve modulates the received beam under the control of the control signal, including:
and the light valve reflects the received laser beam at a negative deflection angle under the control of the control signal.
Optionally, the method further comprises: and the laser stops emitting light under the driving of the driving signal.
Optionally, the color of the primary color component of the image to be displayed is different from the color of the laser beam emitted by the laser.
Optionally, the primary color component of the image to be displayed is a fluorescent primary color light, the image to be displayed includes a prompt pattern, and the fluorescent primary color light is used for displaying the prompt pattern;
or the primary color component of the image to be displayed consists of two fluorescent primary color lights, the image to be displayed consists of a prompt pattern and a background pattern, one of the two fluorescent primary color lights is used for displaying the prompt pattern, and the other of the two fluorescent primary color lights is used for displaying the background pattern.
Optionally, the laser emits a blue laser beam, and the primary color component of the image to be displayed is green fluorescent primary color light.
Optionally, the detection signal is used to indicate that an object to be protected is present within a laser projection area of the laser.
According to a second aspect of embodiments of the present invention, there is provided a projection display system, comprising: the device comprises a laser, a control system, a color wheel, a light valve and a lens;
the control system is used for synchronously outputting a driving signal to the laser and a control signal to the light valve according to image information of an image to be displayed when receiving a detection signal indicating that an obstacle exists in a laser projection area, wherein the driving signal is used for driving a laser beam emitted by the laser to irradiate the color wheel and then enabling the color wheel to emit fluorescent primary color light;
the laser is used for emitting laser beams under the driving of the driving signal;
the color wheel is used for carrying out wavelength conversion on the received laser beam and emitting fluorescence primary color light of at least one color;
the light valve is used for modulating the received light beam under the control of the control signal and outputting the modulated fluorescence primary color light to the lens for imaging.
Optionally, the color wheel is further configured to transmit a laser beam irradiated to the color wheel, and the light valve is further configured to reflect the received laser beam at a negative deflection angle under the control of the control signal.
Optionally, the laser is further configured to stop emitting light when driven by the driving signal.
Optionally, the color of the primary color component of the image to be displayed is different from the color of the laser beam emitted by the laser.
Optionally, the primary color component of the image to be displayed is a fluorescent primary color light, the image to be displayed includes a prompt pattern, and the fluorescent primary color light is used for displaying the prompt pattern;
or the primary color component of the image to be displayed consists of two fluorescent primary color lights, the image to be displayed consists of a prompt pattern and a background pattern, one of the two fluorescent primary color lights is used for displaying the prompt pattern, and the other of the two fluorescent primary color lights is used for displaying the background pattern.
Optionally, the laser emits a blue laser beam, and the primary color component of the image to be displayed is green fluorescent primary color light.
Optionally, the detection signal is used to indicate that an object to be protected is present within a laser projection area of the laser.
The control system synchronously outputs a driving signal for the laser and a control signal for the light valve to drive a laser beam emitted by the laser to irradiate the color wheel, so that the color wheel emits fluorescent primary color light, the light valve is controlled to modulate the received light beam, and the modulated fluorescent primary color light is output to the lens for imaging. When the projection display method is applied to realizing the human eye protection function, the efficiency of protecting human eyes can be improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a projection display system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a color wheel segment according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another projection display system according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a signal processing unit according to an embodiment of the present invention.
Fig. 5 is a flowchart of a projection display method according to an embodiment of the present invention.
Fig. 6 is a flowchart of another projection display method according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of an image to be displayed according to an embodiment of the present invention.
Fig. 8 is a flowchart of another projection display method according to an embodiment of the present invention.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of a projection display system 10 according to a projection display method provided in an embodiment of the present invention, and as shown in fig. 1, the system may include: a laser 101, a control system 102, a color wheel 103, a light valve 104 and a lens 105.
The control system 102 is configured to, when receiving a detection signal indicating that an obstacle exists in the laser projection area, synchronously output a driving signal for the laser 101 and a control signal for the light valve 104 according to image information of an image to be displayed, where the driving signal is used to drive the color wheel 103 to emit a fluorescent primary color light after a laser beam emitted by the laser 101 is irradiated to the color wheel 103. Wherein the detection signal is used to indicate the presence of an object to be protected within the laser projection area of the laser 101.
The laser 101 is used for emitting a laser beam driven by a driving signal. For example, the laser 101 is used to emit a laser beam of at least one color.
The color wheel 103 is used for performing wavelength conversion on the received laser beam to emit at least one color of fluorescence primary light.
The light valve 104 is used for modulating the received light beam under the control of the control signal, and outputting the modulated fluorescence primary color light to the lens 105 for imaging.
Optionally, color wheel 103 is also used to transmit the laser beam that is irradiated to color wheel 103. For example, color wheel 103 has a fluorescent region and a laser transmitting region. The fluorescent area is provided with fluorescent powder, and when the laser beam irradiates the fluorescent area, the laser beam can excite the fluorescent powder in the fluorescent area to emit fluorescent light with corresponding colors. When the laser beam is irradiated to the laser transmission region, the laser beam is transmitted. In the projection display process, the fluorescent wheel is arranged on the propagation path of the laser and is controlled to rotate, so that laser beams emitted by the laser 101 are irradiated to different areas of the fluorescent wheel in turn and periodically, and the laser 101 can output light beams with colors corresponding to the irradiated areas of the fluorescent wheel in a time sequence.
For example, the laser 101 may emit blue laser light, and as shown in fig. 2, the color wheel 103 has a green fluorescent region in which green phosphor is disposed, a red fluorescent region in which red phosphor is disposed, and a laser transmission region. When the blue laser beam emitted from the laser 101 is irradiated to the green phosphor in the green phosphor region, the green phosphor can emit green phosphor under excitation of the blue laser beam. When the blue laser beam irradiates the red phosphor in the red phosphor region, the red phosphor can emit red phosphor under excitation of the blue laser beam. When the blue laser beam irradiates the laser transmission area, the blue laser beam is transmitted.
In one implementation of the protection of the projection display, the light beam emitted from the color wheel 103 may include a laser beam and a fluorescent beam, and in this case, the light valve 104 may be controlled by the control system 102 to implement the protection function of the projection display.
That is, when the color wheel 103 emits the fluorescent light beam to the light valve 104, the light valve 104 can reflect the received fluorescent light beam at a positive deflection angle under the control of the control signal. When the color wheel 103 transmits the laser beam to the light valve 104, the light valve 104 is further configured to reflect the received laser beam at a negative deflection angle under the control of the control signal.
Moreover, the light valve 104 can also screen the light beam emitted to the surface of the light valve 104, so as to reflect the light beam required for displaying the image to the lens 105. For example, when the control system 102 determines that the light beam irradiated to the light valve 104 is a light beam required for displaying an image, 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 for imaging, thereby displaying the image. When the control system 102 determines that the light beam irradiated to the light valve 104 is not required for displaying an image, the control system 102 may 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.
In another implementation manner of the projection display protection, since the light emitting process of the laser 101 can be controlled by the control system 102, at this time, the control system 102 can provide a driving signal for stopping the light emitting to the laser 101, so that the laser 101 stops the light emitting under the driving of the driving signal. Alternatively, the laser 101 may be supplied with a drive signal having a reduced amplitude to reduce the brightness of the laser beam emitted by the laser 101. Further, when light emission is stopped by driving the laser 101, power consumption consumed by the laser light emission can be reduced.
Since the control system 102 may provide the laser 101 with a red driving signal, a green driving signal, and a blue driving signal, respectively, when the color of the light beam emitted from the color wheel 103 is red, green, and blue, respectively. And the light from the laser 101 is synchronized with the rotation of the color wheel 103, the control system 102 may provide a driving signal to the laser 101 to stop the light emission in a period in which the color wheel 103 rotates to the laser transmission region, so as to drive the laser 101 to stop the light emission. Alternatively, the control system 102 may not supply the driving signal to the laser 101 during this period, so that the laser 101 can stop emitting light. Alternatively, during this period, the control system 102 may provide a reduced amplitude driving signal to the laser 101 to reduce the brightness of the laser beam emitted by the laser 101. Alternatively, the supply of the drive signal to the laser 101 may be stopped, so that the laser 101 stops emitting the laser beam.
Illustratively, the timing of the control system 102 for providing the laser 101 with the red driving signal is synchronized with the timing of the laser beam emitted by the laser 101 irradiating the red fluorescent region of the color wheel 103, the timing of the control system 102 for providing the laser 101 with the green driving signal is synchronized with the timing of the laser beam emitted by the laser 101 irradiating the green fluorescent region of the color wheel 103, and the timing of the control system 102 for providing the laser 101 with the blue driving signal is synchronized with the timing of the laser beam emitted by the laser 101 irradiating the laser transmitting region of the color wheel 103. Therefore, the control system 102 may supply a drive signal for stopping light emission to the laser 101 in a period for supplying the blue drive signal to the laser 101, so that the laser 101 stops emitting the laser beam under the control of the drive signal. Alternatively, the control system 102 may not supply the drive signal to the laser 101 during the period for supplying the blue drive signal to the laser 101, so that the laser 101 stops emitting light.
Alternatively, as shown in fig. 3, the control system 102 may include: control means 1021 and drive means 1022. The control device 1021 is configured to send a control signal to the driving device 1022 according to a display requirement, where the control signal may carry projection parameters of the laser 101. Alternatively, the projection parameter may be light emission luminance or the like. The driving device 1022 is used for providing a driving signal to the laser 101 according to the light emitting parameter carried in the received control signal. Wherein the driving signal may be a driving current.
As shown in fig. 3, the driving device 1022 may include a plurality of driving modules for providing driving signals for light beams of different colors to the laser 101. For example, the driving device 1022 may include: the driving device comprises a red driving module, a green driving module and a blue driving module. The red driving module is configured to provide a red driving signal for the red light beam to the laser 101, and the green driving module is configured to provide a blue driving signal for the blue light beam to the laser 101.
Also, synchronization of the driving signals of the respective colors with the color wheel 103 may be achieved by a signal gating function. For example, a gating circuit may be connected in series between the control device 1021 and the driving device 1022, and at least three switching sub-circuits may be provided in the gating circuit, each corresponding to one region of the color wheel 103. Each switch sub-circuit has a control terminal, an input terminal and an output terminal, the control device 1021 may send a red control signal, a green control signal and a blue control signal to the input terminals of the three switch sub-circuits respectively, the control signal of each color carries the projection parameter of the corresponding color, the control device 1021 can send the red selection signal, the green selection signal and the blue selection signal to the control terminals of the three switch sub-circuits respectively, and only one of the three color select signals is active at the same time, that is, only one switch sub-circuit can output a control signal of a corresponding color to the driving device 1022 through the output terminal at the same time, and the driving device 1022 provides a driving signal corresponding to the projection parameter to the laser 101 according to the projection parameter carried in the control signal of the corresponding color, so as to drive the laser 101 to emit laser light according with the projection parameter. Wherein the period in which the selection signal is at the active level coincides with the period in which the laser beam is irradiated to the region of the corresponding color in the color wheel 103.
Further, as shown in fig. 3, the projection display system may further include: a storage device 106, wherein the storage device 106 can store the image information of the image to be displayed. Accordingly, the control system 102 may further include: a multimedia processing unit 1023. When an image needs to be displayed, the multimedia processing unit 1023 can obtain 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 sends a control signal to the light valve 104 or the driving device 1022 according to the image information to realize the display of the image.
The image to be displayed can be an image determined according to actual needs. For example, when the projection display system implements the eye protection function, the image to be displayed may be an image for prompting a user that the projection display system is in the eye protection mode, and when the control system 102 determines that an object to be protected (e.g., a person) exists in the laser projection area, the control system may obtain image information of the image to be displayed from the storage device 106, and control the light valve 104 according to the image information of the image to be displayed, so as to image the image to be displayed on the lens 105, thereby prompting the user that the projection display system is in the eye protection mode.
Alternatively, to ensure efficient implementation of the projection display function, 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 are used to illustrate the implementation of the method:
in one example, 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 region and other regions, which are regions of the image to be displayed other than the pattern region. The pattern area is provided with a prompt pattern, and the fluorescent primary color light is used for displaying the prompt pattern. Alternatively, the prompting pattern can be a word or an icon. And because the optical power density of the fluorescence is far less than that of the laser, the damage of the fluorescence to human eyes is far less than that of the laser to human eyes, therefore, when the primary color component of the image to be displayed is a fluorescent primary color light, the prompting function can be realized, and the damage to human eyes can be effectively reduced.
Moreover, 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. For example, the gray levels of the pixel points in the other regions may be all low gray levels, so that the pixel points in the other regions appear black or dark. In this way, not only can the prompt function be realized, but also the damage to the human eyes can be reduced, and the display energy consumption of the control system 102 can be effectively reduced.
For example, the laser 101 is configured to emit a blue laser beam, at this time, a primary color component of the image to be displayed may be a green fluorescent primary color light, at this time, the green fluorescent primary color light is used to display a prompt pattern in the image to be displayed, and pixel points in other areas are all presented as black.
In another example, the primary color component of the image to be displayed may be composed of two fluorescent primary colors, one of which is used to display the cue pattern and the other of which is used to display the background pattern, and the image to be displayed may be composed of the cue pattern and the background pattern.
Alternatively, the primary color component of the image to be displayed may also comprise a laser beam, but the proportion of the laser beam in the primary color component of the image to be displayed is small. The proportion can be achieved 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 can still meet the requirement of projection display protection. The implementation manner of reducing the brightness of the emitted laser beam may be: the magnitude of the drive current supplied to the laser 101 is reduced in accordance with the image information to reduce the brightness of the laser beam emitted by the laser 101.
The amount of the laser beam reflected to the lens 105 may be determined according to national standards of laser safety level, for example, the amount of the laser beam reflected to the lens 105 may satisfy: the optical power of the 7 mm aperture gorgeous beam is less than or equal to 0.039 mw at a distance of 1051 m from the lens. Alternatively, the amount of laser light reflected to the lens 105 may be determined according to the operating mode of the projection display system. That is, different amounts of laser light may be reflected to the lens 105 in different operating modes. For example, the operation modes of the projection display system may include: the child mode, the youth mode, the day mode, the night mode, and the like may reflect the laser light of the corresponding amount to the lens 105 in each working mode, and when the working mode in which the user sets the projection display system to the child mode, the amount corresponding to the child mode may be reflected to the lens 105.
Optionally, as shown in fig. 3, the projection display system may further include: an optical engine illumination device 107 and an optical path 108. An optical illumination device 107 is disposed between the color wheel 103 and the light valve 104, and is configured to project a light beam emitted from the color wheel 103 to the light valve 104. An optical path 108 is disposed between light valve 104 and lens 105 for shaping the array of light beams reflected by light valve 104 such that the shaped and constrained array of light beams has a shape. For example, when the image to be displayed is rectangular, the array of light beams reflected by the light valve 104 may be shaped to result in a rectangular array of light beams, such that the displayed image is rectangular.
Alternatively, the projection display system may be a Digital Light Processing (DLP) system, and accordingly, the projection display system may include: a micromirror device. The micro-mirror device may be a digital micro-mirror device (DMD), the DMD may include a plurality of light valves 104 (also called micro-mirrors) arranged in an array, and the plurality of light valves 104 may correspond to a plurality of pixel points in an image to be displayed. Typically, a plurality of light valves 104 corresponds to a plurality of pixels.
Further, as shown in fig. 3, the projection display system may further include: and a detection device 109. The detection device 109 is configured to detect whether an object to be protected exists in a laser projection area of the laser 101, and send a detection signal indicating that an obstacle exists in the laser projection area to the control system when it is determined that the object to be protected exists in the laser projection area. Wherein, the object to be protected can be a person.
Alternatively, when the object to be protected is a target living body (e.g., a human), as shown in fig. 3, 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 configured to detect whether an infrared signal is present 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 configured to sequentially perform amplification processing, comparison processing, and logic processing on the electrical signal to obtain a pulse signal, and send the pulse signal to the signal logic unit 1093. The logical process may be a logic or process.
Since the magnitude of the electrical signal transmitted from the sensor unit 1091 is usually several millivolts (mv), if the electrical signal is directly transmitted to the signal logic unit 1093, the signal logic unit 1093 may not recognize the electrical signal, and therefore, before the electrical signal is transmitted to the signal logic unit 1093, a series of processing operations such as amplification of the electrical signal is performed by the signal processing unit 1092, so that the electrical signal can be effectively recognized and processed by the signal logic unit 1093, thereby improving the detection accuracy.
The signal logic unit 1093 is configured to determine whether a living target body exists in the laser projection area based on the pulse signal, and send an active level signal to the control system 102 when a living target body exists in the laser projection area. The active level signal is a detection signal for indicating the existence of an obstacle in the laser projection area.
For example, referring to fig. 4, the signal processing unit 1092 may include: an amplification module 1092a, a comparison module 1092b, and a logic module 1092 c. The amplifying module 1092a is configured to amplify the electrical signal, as shown in fig. 4, the electrical signal sent by the sensor unit 1091 is a signal a, and the amplifying module 1092a amplifies the signal a as a whole to obtain a signal B. The maximum value of the signal A is 2mv, and the maximum value of the amplified signal B is 2.5 v. The minimum value of the signal a is 0.5mv and the minimum value of the amplified signal B is 0.5 v.
The comparison module 1092b stores a high voltage threshold and a low voltage threshold, and the comparison module 1092b may compare the absolute values of the amplitudes of the amplified electrical signals at different times with the high voltage threshold and the low voltage threshold, respectively, to obtain two pulse signals. As shown in fig. 4, the comparing module 1092B is provided with a high voltage threshold a1 and a low voltage threshold a2, and compares the absolute value of the amplitude of the signal B at different times with the high voltage threshold a1 to obtain the pulse signal C. When the absolute value of the amplitude of the signal B at a certain time is greater than the high voltage threshold a1, the level of the pulse signal C at the certain time is high, and when the absolute value of the amplitude of the signal B at the certain time is less than the high voltage threshold a1, the level of the pulse signal C at the certain time is low. And comparing the absolute values of the amplitudes of the signal B at different moments with a low voltage threshold value a2 to obtain a pulse signal D. Here, when the absolute value of the amplitude of the signal B at a certain time is greater than the low voltage threshold a2, the level of the pulse signal D at that time is high, and when the absolute value of the amplitude of the signal B at a certain time is less than a2, the level of the pulse signal D at that time is low.
The logic module 1092c may perform a logical or operation on the two pulse signals output by the comparing module 1092b to obtain a pulse signal. For example, as shown in fig. 4, the logic module 1092C may perform a logic or operation on the pulse signal C and the pulse signal D to obtain the pulse signal E.
Alternatively, after receiving the pulse signal sent by the signal processing unit 1092, the signal logic unit 1093 may count the number of pulses of the pulse signal in a unit time period, compare the number of pulses with a reference number threshold, and when the number is greater than or equal to the reference number threshold, the signal logic unit 1093 determines that the target living body exists in the laser projection area, and sends a notification signal to the control system 102. When the number is smaller than the reference number threshold value, the signal logic unit 1093 determines that the living target body does not exist within the laser projection area, and does not send a notification signal to the control system 102. Alternatively, the reference number threshold may be determined based on the energy of infrared rays emitted from the target living body.
Alternatively, the signal logic unit 1093 may detect whether another pulse is received within the reference time period after receiving one pulse, determine that a target living body exists in the laser projection area and send the notification signal to the control system 102 if another pulse is received within the reference time period, and determine that a target living body does not exist in the laser projection area and do not send the notification signal to the control system 102 if another pulse is not received within the reference time period. The reference time duration may be determined according to actual needs, for example, the reference time duration may be 3 seconds.
The projection display method provided by the embodiment of the invention is explained below. The method can be applied to the projection display system provided by the embodiment of the invention. Fig. 5 is a flowchart of a projection display method according to an embodiment of the present invention, please refer to fig. 5, in which the method includes:
The driving signal is used for driving the laser beam emitted by the laser to irradiate the color wheel so as to enable the color wheel to emit the fluorescent primary color light. The control signal is used for controlling the reflection angle of the light valve to the light beam.
And step 504, the light valve modulates the received light beam under the control of the control signal, and outputs the modulated fluorescence primary color light to the lens for imaging.
In summary, in the projection display method provided in the embodiment of the present invention, the control system synchronously outputs the driving signal for the laser and the control signal for the light valve to drive the laser beam emitted by the laser to irradiate the color wheel, so that the color wheel emits the fluorescent primary color light, and the light valve is controlled to modulate the received light beam, and output the modulated fluorescent primary color light to the lens for imaging. When the projection display method is applied to realizing the human eye protection function, the efficiency of protecting human eyes can be improved.
Fig. 6 is a flowchart of another projection display method according to an embodiment of the present invention, which can be applied to the projection display system according to the embodiment of the present invention, and the method implements a projection display protection function by controlling a reflection direction of a light valve to a light beam. Referring to fig. 6, the method may include:
The implementation manner of step 601 refers to the implementation manner of detecting the object to be protected by the detection device in the projection display system.
The first notification signal is used for notifying a control system that an object to be protected exists in a laser projection area.
And step 603, the control system acquires the image information of the image to be displayed in the storage device based on the first notification signal.
The image to be displayed can be an image determined according to actual needs. For example, when the projection display system implements a human eye protection function, the image to be displayed may be an image for prompting a user that the projection display system is in a human eye protection mode, and when the control system determines that an object to be protected (e.g., a person) exists in the laser projection area, the control system may acquire image information of the image to be displayed from the storage device 105, and control the light valve according to the image information of the image to be displayed, so as to implement display of the image to be displayed, and further prompt the user that the projection display system is in the human eye protection mode.
Optionally, to ensure effective implementation of the projection display function, 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 are used to illustrate the implementation of the method:
in one example, 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 region and other regions, which are regions of the image to be displayed other than the pattern region. The pattern area is provided with a prompt pattern, and the fluorescent primary color light is used for displaying the prompt pattern. Alternatively, the prompting pattern can be a word or an icon. Because the optical power density of the fluorescence is far less than that of the laser, the damage of the fluorescence to human eyes is far less than that of the laser to human eyes, and therefore, when the primary color component of the image to be displayed is the primary color light of the fluorescence, the prompting function can be realized, and the damage to the human eyes can be effectively reduced.
Moreover, 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. For example, the gray levels of the pixel points in the other regions may be all low gray levels, so that the pixel points in the other regions appear black or dark. Therefore, the prompting function can be realized, the damage to human eyes can be reduced, and the display energy consumption of the control system can be effectively reduced. As shown in fig. 7, the display color of the diagonally filled region in fig. 7 is fluorescent green, and the display colors of the other regions are black.
For example, the laser is configured to emit a blue laser beam, at this time, the primary color component of the image to be displayed may be a green fluorescent primary color light, that is, the green fluorescent primary color light is used to display a prompt pattern in the image to be displayed, and the pixel points in other areas are all presented in black.
In another example, 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 the cue pattern and the background pattern, one of the two fluorescent primary colors is used for displaying the cue pattern, and the other of the two fluorescent primary colors is used for displaying the background pattern.
Alternatively, the primary color component of the image to be displayed may also comprise a laser beam, but the proportion of the laser beam in the primary color component of the image to be displayed is small. And the proportion can be reduced by reducing the brightness of the emitted laser beams, or the quantity of the laser beams reflected by the light valve can be controlled, so that when the laser beams reflected to the lens are a certain value, the image formed in the lens can still meet the requirement of projection display protection. The implementation manner of reducing the brightness of the emitted laser beam may be: the magnitude of the drive current supplied to the laser is reduced in accordance with the image information to reduce the brightness of the laser beam emitted by the laser.
The amount of the laser beam reflected to the lens can be determined according to national standards of laser safety level, for example, the amount of the laser beam reflected to the lens can satisfy the following conditions: the optical power of the 7 mm aperture gorgeous beam is less than or equal to 0.039 mw at a distance of 1 m from the lens. Alternatively, the amount of laser light reflected to the lens may be determined according to the operating mode of the projection display system. That is, different amounts of laser light can be reflected to the lens in different operating modes. For example, the operation modes of the projection display system may include: the children mode, young mode, day mode and night mode etc. can reflect the laser to the camera lens of corresponding volume under every mode, and when the user set up projection display system's mode for children's mode, can reflect the volume that this children's mode corresponds to the camera lens.
The driving signal is used for driving the laser to emit laser beams. The driving signal may be determined according to image information of an image to be displayed. For example, the driving signal may be a driving current, and the magnitude of the driving current may be determined according to pixel values of pixel points in the image information.
The control signal is used to control the reflection direction of the light valve reflecting the received signal. And, the control signal may be determined according to the first notification signal and the 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 the lens for imaging. When the control system does not receive the first notification signal and determines that the light beam irradiated to the light valve is the light beam which is not needed for displaying the image according to the image information, the control signal is used for indicating 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 light beam cannot be irradiated to the lens for imaging. When the control system does not receive the first notification signal and determines that the light beam irradiated to the light valve is the light beam required for displaying the image according to the image information, the control signal is used for indicating the light valve to reflect the received laser beam at a positive deflection angle and reflect the laser beam to the lens for imaging.
After the laser beam emitted by the laser irradiates the color wheel, the color wheel can convert the wavelength of the received laser beam and emit at least one color of fluorescent primary color light. Also, for example, the color wheel may transmit a laser beam irradiated to the color wheel. The color wheel may have two fluorescent regions and a laser projection region, and at this time, the color wheel may perform wavelength conversion on the laser beam irradiated to the fluorescent regions, and emit fluorescent primary color light of a color corresponding to the fluorescent regions, and the color wheel may transmit the laser beam irradiated to the laser projection region.
And step 607, the light valve modulates the received light beam under the control of the control signal, and outputs the modulated fluorescence 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 optical machine illumination device, and at the moment, 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 irradiate to the optical path, and the light beam is irradiated to the lens for imaging after being subjected to shaping constraint of the optical path.
When the light beam irradiated to the light valve is a laser beam, in order to ensure effective implementation 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 cannot be irradiated to the lens for imaging. Correspondingly, when the light beam irradiated to the light valve is the fluorescence primary color light beam, the light valve can reflect the received fluorescence primary color light beam at a positive deflection angle under the control of the control signal, so that the laser light beam irradiates the lens for imaging.
It should be noted that, when the detection device determines that the object to be protected does not exist in the laser projection area, a second notification signal may be sent to the control system, where the second notification signal is used to notify the control system that the object to be protected does not exist in the laser projection area. At the moment, 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 a driving signal for the laser and a control signal for the light valve according to the image information so as to realize the display of the image to be displayed.
In summary, in the projection display method provided in the embodiment of the present invention, the control system synchronously outputs the driving signal for the laser and the control signal for the light valve to drive the laser beam emitted by the laser to irradiate the color wheel, so that the color wheel emits the fluorescent primary color light, and the light valve is controlled to modulate the received light beam, and output the modulated fluorescent primary color light to the lens for imaging. When the projection display method is applied to realizing the human eye protection function, the efficiency of protecting human eyes can be improved.
Fig. 8 is a flowchart of another projection display method according to an embodiment of the present invention, which may be applied to the projection display system according to the embodiment of the present invention, and the method implements a projection display protection function by providing different driving signals to the laser. Referring to fig. 8, the method may include:
The implementation manner of step 801 refers to the implementation manner of detecting the object to be protected by the detection device in the projection display system.
The first notification signal is used for notifying a control system that an object to be protected exists in a laser projection area.
And step 803, the control system acquires the image information of the image to be displayed in the storage device based on the first notification signal.
For an implementation of this step 803, please refer to the implementation of the aforementioned step 603.
And step 804, the control system synchronously outputs a driving 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 for driving a laser beam emitted by the laser. The driving signal may be determined according to the first notification signal. For example, the control system may provide a drive signal to the laser to stop the laser from emitting light during a period in which the color wheel rotates to the laser transmission region to drive the laser to stop emitting light. Alternatively, the control system may not provide the drive signal to the laser during this period, so that the laser can stop emitting light.
The control signal is used to control the reflection direction of the light valve reflecting the received signal. And, the control signal may be determined according to the image information. For example, when the light beam irradiated to the light valve is determined to be a light beam not required for displaying an image according to the image information, the control signal is used for instructing 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 light beam cannot be irradiated to the lens for imaging. When the light beam irradiated to the light valve is determined to be the light beam required for displaying the image according to the image information, the control signal is used for indicating the light valve to reflect the received laser beam at a positive deflection angle and reflect the laser beam to the lens for imaging.
The laser may stop emitting the laser beam by being driven by the driving signal during a period in which the color wheel rotates to the laser transmission region, and may emit light by being driven by the driving signal during a period in which the color wheel rotates to the fluorescent region.
The color wheel is also used for transmitting the laser beam irradiated to the color wheel. The implementation procedure of this step 806 refers to the implementation procedure of step 606.
In step 807, the light valve modulates the received fluorescent light beam under the control of the control signal, and outputs the modulated primary fluorescent light to the lens for imaging.
When the laser is controlled by the driving signal to stop emitting the laser beam, the light beams irradiated to the light valve are all fluorescent light beams, and at the moment, the light valve can reflect the fluorescent light beams according to the control signal. For example, when the fluorescent light beam irradiated to the light valve is not required for displaying an image, the light valve may 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 be irradiated to the lens for imaging. When the fluorescent light beam irradiated to the light valve is a light beam required for displaying an image, the light valve may reflect the received fluorescent light beam at a positive deflection angle, and reflect the fluorescent light beam to the lens for imaging.
It should be noted that, when the detection device determines that the object to be protected does not exist in the laser projection area, a second notification signal may be sent to the control system, where the second notification signal is used to notify the control system that the object to be protected does not exist in the laser projection area. At the moment, 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 a driving signal for the laser and a control signal for the light valve according to the image information so as to realize the display of the image to be displayed.
Moreover, when the control system receives the first notification signal, the control system may also control the laser to emit a laser beam and control the light valve to reflect the laser beam to the lens for imaging. For example, the brightness of the emitted laser beam can be reduced, or the amount of laser reflection by the light valve can be controlled, so that when the laser beam reflected to the lens is a certain value, the image formed in the lens can still meet the requirement of projection display protection. The implementation manner of reducing the brightness of the emitted laser beam may be: the magnitude of the drive current supplied to the laser is reduced in accordance with the image information to reduce the brightness of the laser beam emitted by the laser.
Correspondingly, when the object to be protected does not exist in the laser projection area, the amplitude of the driving signal provided for the laser can be adjusted to be a default value, so that the laser emits laser beams according to default brightness, and the normal light emitting process of the laser is recovered. For example, if the magnitude of the driving current supplied to the laser is reduced in the previous projection display process, the magnitude of the driving current supplied to the laser may be controlled to be increased based on the second notification signal.
Alternatively, the amount of the laser beam reflected to the lens may be determined according to national standards of laser safety class, for example, the amount of the laser beam reflected to the lens may satisfy: the optical power of the 7 mm aperture gorgeous beam is less than or equal to 0.039 mw at a distance of 1 m from the lens. Alternatively, the amount of laser light reflected to the lens may be determined according to the operating mode of the projection display system. That is, different amounts of laser light can be reflected to the lens in different operating modes. For example, the operation modes of the projection display system may include: the utility model discloses a projection display system, including children mode, young mode, day mode and night mode, every mode can reflect the laser to the camera lens of corresponding volume, and when the user set up projection display system's mode for children mode, can reflect the volume that this children mode corresponds to the camera lens.
In summary, in the projection display method provided in the embodiment of the present invention, the control system synchronously outputs the driving signal for the laser and the control signal for the light valve to drive the laser beam emitted by the laser to irradiate the color wheel, so that the color wheel emits the fluorescent primary color light, and the light valve is controlled to modulate the received light beam, and output the modulated fluorescent primary color light to the lens for imaging. When the projection display method is applied to realizing the human eye protection function, the efficiency of protecting human eyes can be improved.
It should be noted that, the order of the method steps of the projection display method provided in the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the circumstances, and any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application shall be included in the protection scope of the present application, and therefore, the details are not described again.
An embodiment of the present invention further provides a control system, including:
a processor.
A memory for storing executable instructions of the processor.
Wherein the processor is configured to: executable instructions in the memory are executed to realize the functions of the control system in the projection display method provided by the embodiment of the invention.
The embodiment of the present invention further provides a computer-readable storage medium, which may be a non-volatile storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a processing component, the instructions cause the processing component to execute the functions of the control system in the projection display method provided in the embodiment of the present invention.
Embodiments of the present invention further provide a computer program product including instructions, which, when the computer program product runs on a computer, causes the computer to execute the functions of the control system in the projection display method provided in the embodiments of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (14)
1. A projection display method is applied to a projection display system, and the projection display system comprises: laser, control system, colour wheel, light valve and camera lens, the method includes:
when the control system receives a detection signal indicating that an obstacle exists in a laser projection area, a driving signal for the laser and a control signal for the light valve are synchronously output according to image information of an image to be displayed, and the driving signal is used for driving a laser beam emitted by the laser to irradiate the color wheel so as to enable the color wheel to emit fluorescent primary light; the image to be displayed comprises a prompt pattern, and the primary color components of the image to be displayed comprise: a fluorescent primary color light for displaying the cue pattern;
the laser emits laser beams under the driving of the driving signal;
the color wheel performs wavelength conversion on the received laser beam and at least emits fluorescent primary color light of one color;
and the light valve modulates the received light beam under the control of the control signal and outputs the modulated fluorescence primary color light to the lens for imaging.
2. The method of claim 1, wherein the color wheel is further configured to transmit a laser beam to the color wheel, and the light valve modulates the received beam under the control of the control signal, comprising:
and the light valve reflects the received laser beam at a negative deflection angle under the control of the control signal.
3. The method of claim 1, further comprising:
and the laser stops emitting light under the driving of the driving signal.
4. A method according to any one of claims 1 to 3, wherein the primary color component of the image to be displayed is of a different color than the laser beam emitted by the laser.
5. The method according to claim 4, wherein the primary color component of the image to be displayed is a fluorescent primary color light, and the fluorescent primary color light is used for displaying the prompt pattern;
or the primary color component of the image to be displayed consists of two fluorescent primary color lights, the image to be displayed consists of the prompt pattern and the background pattern, one of the two fluorescent primary color lights is used for displaying the prompt pattern, and the other of the two fluorescent primary color lights is used for displaying the background pattern.
6. The method according to claim 5, wherein the laser emits a blue laser beam and the primary color component of the image to be displayed is a green fluorescent primary color light.
7. A method according to any one of claims 1 to 3, wherein the detection signal is used to indicate the presence of an object to be protected within the laser projection area of the laser.
8. A projection display system, comprising: the device comprises a laser, a control system, a color wheel, a light valve and a lens;
the control system is used for synchronously outputting a driving signal to the laser and a control signal to the light valve according to image information of an image to be displayed when receiving a detection signal indicating that an obstacle exists in a laser projection area, wherein the driving signal is used for driving a laser beam emitted by the laser to irradiate the color wheel and then enabling the color wheel to emit fluorescent primary light; the image to be displayed comprises a prompt pattern, and the primary color components of the image to be displayed comprise: a fluorescent primary color light for displaying the cue pattern;
the laser is used for emitting laser beams under the driving of the driving signal;
the color wheel is used for carrying out wavelength conversion on the received laser beam and emitting fluorescence primary color light of at least one color;
the light valve is used for modulating the received light beam under the control of the control signal and outputting the modulated fluorescence primary color light to the lens for imaging.
9. The system of claim 8, wherein the color wheel is further configured to transmit a laser beam directed to the color wheel, and the light valve is further configured to reflect the received laser beam at a negative deflection angle under control of the control signal.
10. The system of claim 8, wherein the laser is further configured to stop emitting light when driven by the driving signal.
11. The system according to any one of claims 8 to 10, wherein the primary color component of the image to be displayed has a color different from the color of the laser beam emitted by the laser.
12. The system according to claim 11, wherein the primary color component of the image to be displayed is a fluorescent primary color light for displaying the prompt pattern;
or the primary color component of the image to be displayed consists of two fluorescent primary color lights, the image to be displayed consists of the prompt pattern and the background pattern, one of the two fluorescent primary color lights is used for displaying the prompt pattern, and the other of the two fluorescent primary color lights is used for displaying the background pattern.
13. The system of claim 12, wherein the laser emits a blue laser beam and the primary color component of the image to be displayed is a green fluorescent primary color light.
14. The system of any one of claims 8 to 10, wherein the detection signal is indicative of the presence of an object to be protected within a laser projection area of the laser.
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| CN208299916U (en) * | 2018-05-02 | 2018-12-28 | 深圳吉祥星科技股份有限公司 | A kind of projector |
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