CN113691787A - Projection equipment and field angle adjusting method thereof - Google Patents

Projection equipment and field angle adjusting method thereof Download PDF

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Publication number
CN113691787A
CN113691787A CN202010419446.3A CN202010419446A CN113691787A CN 113691787 A CN113691787 A CN 113691787A CN 202010419446 A CN202010419446 A CN 202010419446A CN 113691787 A CN113691787 A CN 113691787A
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Prior art keywords
optical signal
target
receiving
field angle
assembly
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Granted
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CN202010419446.3A
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CN113691787B (en
Inventor
陈许
朱亚文
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Qingdao Hisense Laser Display Co Ltd
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Qingdao Hisense Laser Display Co Ltd
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Priority to CN202010419446.3A priority Critical patent/CN113691787B/en
Priority to CN202211167587.6A priority patent/CN115802015A/en
Priority to CN202180036211.9A priority patent/CN115516852B/en
Priority to PCT/CN2021/089280 priority patent/WO2021233068A1/en
Publication of CN113691787A publication Critical patent/CN113691787A/en
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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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • 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
    • 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
    • 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
    • G03B21/2053—Intensity control of illuminating light
    • 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]
    • 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]
    • H04N9/3141—Constructional details thereof
    • 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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • 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]
    • H04N9/3179—Video signal processing therefor

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Projection Apparatus (AREA)

Abstract

The application discloses a projection device and a field angle adjusting method thereof, and belongs to the field of projection display. The control circuit in the projection equipment is used for determining a target distance between a target object and the projection equipment according to the light output time value of the light signal emitting component and the light receiving time value of the light signal receiving component; adjusting the receiving field angle of the optical signal receiving assembly according to the target distance; and adjusting the brightness of the laser light source according to the target distance. Because the size of the adjusted receiving field angle is inversely related to the length of the target distance, when the target object is closer to the projection device, the larger receiving field angle can increase the detection range of the optical signal receiving assembly, so that the detection range of the target object is more comprehensive, and the reliability of the detection of the target object is improved. Meanwhile, the brightness of the laser light source can be adjusted according to the target distance, so that human eyes are effectively protected.

Description

Projection equipment and field angle adjusting method thereof
Technical Field
The present disclosure relates to the field of projection display, and in particular, to a projection device and a method for adjusting a field angle thereof.
Background
At present, after laser emitted by projection equipment is projected onto a projection screen, an image can be projected onto the projection screen. However, since the laser light emitted from the projection device has high brightness, the laser light may cause damage to human eyes when the user is close to the projection screen.
In the related art, the projection device may include a pyroelectric sensor and a control circuit. When a human body in the sensing range of the pyroelectric sensor moves, the pyroelectric sensor can detect infrared signals radiated by the human body and amplify the received infrared signals. And then converting the amplified infrared signal into an electric signal and sending the electric signal to a control circuit. When the control circuit determines that the electric signal is larger than the signal threshold, the brightness of the projection screen can be reduced, and therefore damage to human eyes caused by laser emitted by the projection equipment is reduced.
However, the pyroelectric sensor can only detect infrared signals radiated by a human body when the human body moves, so that the reliability of human body detection is low, and the safety of human eye protection is low.
Disclosure of Invention
The embodiment of the disclosure provides a projection device and a method for adjusting a field angle thereof, which can solve the problem that in the related art, a pyroelectric sensor can only detect infrared signals radiated by a human body when the human body moves, so that the safety of protecting human eyes is low. The technical scheme is as follows:
in one aspect, a projection apparatus is provided, the projection apparatus comprising: the optical signal transmitting assembly and the optical signal receiving assembly are arranged on one side of a host of the projection equipment, the optical signal transmitting assembly and the optical signal receiving assembly are arranged on the upper surface or the front side surface of a shell of the projection equipment, and the optical signal receiving assembly comprises a plurality of photoreceptors;
the optical signal transmitting assembly is used for transmitting an optical signal along a preset field angle range;
the optical signal receiving component is used for receiving the optical signal reflected by a target object in front of or at the side of the projection equipment;
the control circuit is respectively connected with the optical signal transmitting assembly and the optical signal receiving assembly; the system comprises a light signal emitting component, a light signal receiving component and a control component, wherein the light signal emitting component is used for emitting light signals to the light signal receiving component;
the control circuit is further configured to adjust a receiving field angle of the optical signal receiving component according to the target distance, where a size of the receiving field angle is inversely related to a length of the target distance;
and the optical signal receiving component is also used for receiving the optical reflection signal at the adjusted receiving field angle, and the control circuit is also used for adjusting the brightness of the laser light source according to the target distance.
In another aspect, a viewing angle adjusting method is provided, where the method is applied to a control circuit in a projection apparatus, and the projection apparatus further includes: the projection device comprises an optical signal transmitting assembly and an optical signal receiving assembly which are arranged on one side of a host of the projection device, wherein the optical signal transmitting assembly and the optical signal receiving assembly are arranged on the upper surface or the front side surface of a shell of the projection device, the optical signal receiving assembly comprises a plurality of photoreceptors, the control circuit is respectively connected with the optical signal transmitting assembly and the optical signal receiving assembly, and the method comprises the following steps:
determining a target distance between the target object and the projection equipment according to the light output time value of the light signal emitting assembly and the light receiving time value of the light signal receiving assembly;
adjusting a receiving field angle of the optical signal receiving assembly according to the target distance, wherein the size of the receiving field angle is inversely related to the length of the target distance, so that the optical signal receiving assembly receives the optical reflection signal at the adjusted receiving field angle;
and adjusting the brightness of the laser light source according to the target distance.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the disclosed embodiments provide a projection apparatus and a viewing angle adjusting method thereof, in which a control circuit may adjust a viewing angle of an optical signal receiving assembly according to a target distance between a target object and the projection apparatus. Because the size of the adjusted field angle is inversely related to the length of the target distance, when the target object is closer to the projection device, the larger field angle can enlarge the detection range of the optical signal receiving assembly, so that the detection range of the target object is more comprehensive, and the reliability of the detection of the target object is improved. In addition, since the angle of view of the optical signal receiving module can be dynamically adjusted according to the distance, flexibility in detecting the target object is improved. Meanwhile, the brightness of the laser light source can be adjusted according to the target distance, so that human eyes are effectively protected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;
fig. 3 is a flowchart of a method for adjusting an angle of view according to an embodiment of the present disclosure;
fig. 4 is a flowchart of another method for adjusting a field angle according to an embodiment of the disclosure;
FIG. 5 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;
FIG. 6 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;
FIG. 7 is a schematic diagram of an optical signal emitting assembly emitting an optical signal and an optical signal receiving assembly receiving an optical signal reflected by a target object according to an embodiment of the disclosure;
fig. 8 is a schematic diagram of a target receiving field angle corresponding to a target distance provided by the embodiment of the present disclosure;
fig. 9 is a schematic diagram of a photoreceptor on-off state when the field angle of the optical signal receiving assembly provided by the embodiment of the disclosure is 30 degrees;
fig. 10 is a schematic diagram of a photoreceptor on-off state when the viewing angle of the optical signal receiving assembly provided by the embodiment of the disclosure is 25 degrees;
fig. 11 is a schematic diagram of a photoreceptor on-off state when the field angle of the optical signal receiving assembly provided by the embodiment of the disclosure is 15 degrees;
fig. 12 is a schematic structural diagram of another projection apparatus provided in an embodiment of the disclosure;
fig. 13 is a schematic diagram of an aperture adjustment process provided in an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present disclosure. Fig. 2 is a schematic structural diagram of another projection apparatus provided in the embodiment of the present disclosure. As shown in fig. 1 and 2, the projection apparatus may include: the control circuit 10, the optical signal emitting assembly 20 and the optical signal receiving assembly 30 are disposed on the host side of the projection device, the optical signal emitting assembly 20 and the optical signal receiving assembly 30 are disposed on the upper surface or the front side of the housing 00 of the projection device, for example, the area 01 in the upper surface, the area 02 in the front side, and the area 03 of the housing 00 may each be disposed with the optical signal emitting assembly 20 and the optical signal receiving assembly 30, the optical signals emitted by the optical signal emitting assembly 20 at different positions may form a range F, and the optical signal receiving assembly 30 may receive the optical signals reflected by the target object located in the range F. The optical signal receiving assembly 30 may include a plurality of photoreceptors arranged in an array.
The control circuit 10 is connected to the optical signal emitting module 20 and the optical signal receiving module 30, respectively. The control circuit 10 is used for controlling the optical signal emitting component 20 to emit an optical signal. Optionally, the optical signal receiving assembly 30 may include M × N photoreceptors arranged in an array, where M is the number of rows of the photoreceptors, N is the number of columns of the photoreceptors, and both M and N are positive integers greater than 1. The photoreceptor may be a photodiode.
Fig. 3 is a flowchart of a method for adjusting an angle of view according to an embodiment of the present disclosure. The adjusting method is applied to the control circuit 10 in the projection device shown in fig. 1 and fig. 2, and as can be seen from fig. 1 and fig. 2, the projection device may further include an optical signal emitting assembly 20 and an optical signal receiving assembly 30 disposed on a host side of the projection device, the optical signal emitting assembly 20 and the optical signal receiving assembly 30 are disposed on an upper surface or a front side of the housing 00 of the projection device, and the optical signal receiving assembly 30 may include a plurality of photoreceptors. The control circuit 10 is connected to the optical signal emitting module 20 and the optical signal receiving module 30, respectively. As shown in fig. 3, the method may include:
step 301, determining a target distance between the target object and the projection device according to the light output time value of the light signal emitting assembly and the light receiving time value of the light signal receiving assembly.
In the disclosed embodiment, the optical signal transmitting assembly may transmit an optical signal along a preset field angle range, and the optical signal receiving assembly may receive an optical signal reflected by a target object in front of or at a side of the projection apparatus. The control circuit can determine the target distance between the target object and the projection equipment according to the light output time value of the light signal emitting component and the light receiving time value of the light signal receiving component.
Alternatively, the target object may be a human or animal located in the transmission optical path of the optical signal emitted by the optical signal emitting assembly.
And step 302, adjusting the receiving field angle of the optical signal receiving assembly according to the target distance.
The control circuit may adjust a receiving angle of view of the optical signal receiving assembly according to the target distance after determining the target distance between the target object and the projection apparatus, so that the optical signal receiving assembly receives the optical reflection signal at the adjusted receiving angle of view. The size of the receiving field angle is inversely related to the length of the target distance. That is, the longer the target distance, the smaller the reception angle of view; the shorter the target distance, the larger the reception angle of view. The receiving angle of view of the optical signal receiving module is a range in which the optical signal receiving module can detect the optical signal, and the larger the receiving angle of view is, the larger the range in which the optical signal receiving module can detect the optical signal is. It should be noted that, after the projection apparatus is started up, the receiving angle of view of the optical signal receiving assembly may be an initial receiving angle of view stored in advance. The initial receiving angle of view may be a maximum receiving angle of view of the optical signal receiving assembly.
And 303, adjusting the brightness of the laser light source according to the target distance.
The control circuit can also adjust the brightness of the laser light source according to the target distance so as to protect human eyes.
In summary, the embodiments of the present disclosure provide a viewing angle adjusting method, which can adjust a receiving viewing angle of an optical signal receiving assembly according to a target distance between a target object and a projection apparatus, so that the optical signal receiving assembly receives an optical reflection signal at the adjusted receiving viewing angle. Because the size of the adjusted receiving field angle is inversely related to the length of the target distance, when the target object is closer to the projection device, the larger receiving field angle can increase the detection range of the optical signal receiving assembly, so that the detection range of the target object is more comprehensive, and the reliability of the detection of the target object is improved. In addition, since the receiving angle of view of the optical signal receiving module can be dynamically adjusted according to the distance, flexibility in detecting the target object is improved. Meanwhile, the brightness of the laser light source can be adjusted according to the target distance, so that human eyes are effectively protected.
Fig. 4 is a flowchart of another method for adjusting a field angle according to an embodiment of the present disclosure. The adjusting method is applied to the control circuit 10 in the projection device shown in fig. 1 and fig. 2, and as can be seen from fig. 1 and fig. 2, the projection device may further include an optical signal emitting assembly 20 and an optical signal receiving assembly 30 disposed on a host side of the projection device, the optical signal emitting assembly 20 and the optical signal receiving assembly 30 are disposed on an upper surface or a front side of the housing 00 of the projection device, and the optical signal receiving assembly 30 may include a plurality of photoreceptors. The control circuit 10 is connected to the optical signal emitting module 20 and the optical signal receiving module 30, respectively. As shown in fig. 4, the method may include:
step 401, in response to the start instruction, starting the optical signal transmitting assembly.
Referring to fig. 1, the projection device may further include a multimedia control assembly 40, the multimedia control assembly 40 being connected to the control circuit 10. A start button may be disposed on the projection device, and the multimedia control component 40 may generate a start instruction after detecting a click operation on the start button, and may send the start instruction to the control circuit 10. The control circuit 10 may activate the optical signal emitting assembly 20 in response to an activation instruction.
Alternatively, the activation instruction may be user-triggered via a remote control. The multimedia control module 40, upon receiving a start command from a remote controller, may send the start command to the control circuit 10. The control circuit 10 may activate the optical signal emitting assembly 20 in response to the activation instruction.
Alternatively, the start instruction may be triggered by the user through a projection client installed in the terminal. The display interface of the projection client may display a start button, and the projection client may generate a start instruction after detecting a click operation of a user on the start button. The projection client may then send the start instruction to the multimedia control component 40. The multimedia control component 40 may send a start instruction to the control circuit 10 after receiving the start instruction sent by the projection client. The control circuit 10 may activate the optical signal emitting assembly 20 in response to the activation instruction.
Optionally, fig. 5 is a schematic structural diagram of another projection apparatus provided in the embodiment of the present disclosure. Fig. 6 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present disclosure. Referring to fig. 5 and 6, the optical signal transmitting assembly 20 may include a laser driving assembly 21 and a laser 22. The control circuit 10 may send an enable signal and a laser drive current signal to the laser drive assembly 21 in response to the start instruction. The laser drive assembly 21 may provide a laser drive current to the laser 22 in response to the enable signal and the laser drive current signal. The laser 22 may emit an optical signal driven by a laser drive current. The laser 22 may have a safety rating of 1 level, and the optical signal receiving element emitted by the laser 22 may be infrared light having a wavelength of 940 nanometers (nm). Alternatively, the laser 22 may be a surface emitting laser (VCSEL).
Step 402, determining the transmission duration of the optical signal according to the optical output time value of the optical signal transmitting assembly and the optical receiving time value of the optical signal receiving assembly.
In the embodiment of the present disclosure, after the control circuit activates the optical signal transmitting assembly, referring to fig. 7, the optical signal transmitting assembly 20 may transmit an optical signal along a preset field angle range, and the optical signal receiving assembly 30 may receive an optical signal reflected by a target object in front of or at a side of the projection apparatus. The control circuit may determine a light output time value T1 at which the optical signal is emitted from the optical signal emitting module 20 and a light reception time value T2 at which the optical signal is received by the optical signal receiving module 30, and determine the transmission time period T of the optical signal based on the light output time value T1 and the light reception time value T2. T2-T1, wherein T2 and T1 are both greater than 0. Alternatively, the target object may be a human or animal located in the transmission optical path of the optical signal emitted by optical signal emitting assembly 20.
Step 403, determining a target distance between the target object and the projection device according to the transmission speed and the transmission duration of the detection optical signal.
The control circuit stores in advance the transmission speed V of the optical signal. After the control circuit determines the transmission time length of the optical signal, the control circuit may determine a target distance S between the target object and the projection device according to the transmission speed V and the transmission time length T of the optical signal. The
Figure BDA0002496377180000071
Since the transmission speed of the optical signal is a fixed value, the length of the target distance is positively correlated with the length of the transmission time. Namely, the longer the transmission time length is, the longer the target distance is; the smaller the transmission duration, the shorter the target distance.
And step 404, determining a target receiving visual field angle corresponding to the target distance range where the target distance is located from the corresponding relation between the distance range and the receiving visual field angle.
The control circuit stores in advance a correspondence relationship between the distance range and the reception angle of view. The control circuit may determine a target distance range in which the target distance is located after determining the target distance between the target object and the projection apparatus, and determine a target reception angle of view corresponding to the target distance range from a correspondence relationship between the distance range and the reception angle of view. The size of the target receiving field angle is inversely related to the length of the target distance, namely the longer the target distance is, the smaller the target receiving field angle is; the shorter the target distance, the larger the target reception field angle.
As an example, assuming that the correspondence relationship between the distance range and the reception angle of view is as shown in table 1, if the target distance is 0.7m, the target distance is within the target distance range (0,0.7 m), that is, the target distance range is greater than 0 and less than or equal to 0.7m, the target reception angle of view corresponding to the target distance range (0,0.7 m) is determined to be 30 degrees from table 1, if the target distance is 1, the target distance is within the target distance range (0.7m, 1 m), that is, the target distance range is greater than 0.7 and less than or equal to 1m, the target reception angle of view corresponding to the target distance range (0.7m, 1 m) is determined to be 25 degrees from table 1, if the target distance is 1.3m, the target distance is within the target distance range (1m, 1.3 m), that is greater than 1 and less than or equal to 1.3m, the target distance range (1m, 1.3m ] corresponds to a target reception angle of 15 degrees.
TABLE 1
Range of distances Receiving field angle
(0，0.7m] 30 degree
(0.7m，1m] 25 degree
(1m，1.3m] 15 degrees
Fig. 8 is a schematic diagram of a target receiving field angle corresponding to a target distance according to an embodiment of the present disclosure. As shown in fig. 8, when the target distance is D1, the control circuit may determine a target reception field angle α 1 corresponding to the target distance range at which the target distance is located from the correspondence relationship between the distance range and the reception field angle, and when the target distance is D2, the control circuit may determine a target reception field angle α 0 corresponding to the target distance range at which the target distance is located from the correspondence relationship between the distance range and the reception field angle. As can be seen from fig. 8, the target distance D1 is smaller than the target distance D2, and the target receiving angle α 1 corresponding to the target distance D1 is larger than the target receiving angle α 0 corresponding to the target distance D2.
In the embodiment of the present disclosure, in order to achieve effective detection of the target object, the receiving field angle FOV of the optical signal receiving assembly needs to satisfy:
Figure BDA0002496377180000081
where B is the reflectance of the target, the magnitude of which is related to the material of the target. In the disclosed embodiment, B may be set to a fixed value. F (d) is an efficiency function, whose value is positively correlated to the distance d, which is the distance between the object and the projection device. f (I)F) The value of (f) is related to the number of the optical signals emitted from the optical signal emitting module and the number of the target photoreceptors when the receiving angle of view of the optical signal receiving module is maximum, and f (I)F) The value of (c) is a fixed value. The number of the optical signals emitted by the optical signal emitting assembly is positively correlated with the duty ratio of the laser driving current signal transmitted to the laser driving circuit by the control circuit. The target photoreceptor is a photoreceptor which is in an open state in the optical signal receiving assembly and can be lightened by an optical signal reflected by a target object.
Due to B and f (I)F) The determined values are fixed values, and it can be seen from the formula that in order to realize effective detection on the target object, the receiving field angle of the optical signal receiving assembly is inversely related to the distance. That is, the shorter the distance between the target object and the projection apparatus, the larger the receiving angle of view of the optical signal receiving module needs to be set. The longer the distance between the object and the projection apparatus is, the smaller the receiving angle of view of the optical signal receiving module can be set.
Step 405 adjusts the reception angle of the optical signal reception module to the target reception angle.
The control circuit may adjust the field angle of the optical signal receiving module to the target receiving field angle after determining the target receiving field angle of the optical signal receiving module, so that the optical signal receiving module receives the optical reflection signal at the target receiving field angle. It should be noted that, after the projection apparatus is started up, the receiving angle of view of the optical signal receiving assembly may be an initial receiving angle of view stored in advance, and the initial receiving angle of view may be a maximum receiving angle of view of the optical signal receiving assembly. The receiving angle of view of the optical signal receiving module is a range in which the optical signal receiving module can detect the optical signal, and the larger the receiving angle of view is, the larger the range in which the optical signal receiving module can detect the optical signal is.
As an alternative implementation of the present disclosure, referring to fig. 5, the projection apparatus may further include a photoreceptor driving circuit 50 connected to the control circuit 10 and the optical signal receiving assembly 30, respectively. The control circuit can determine the alternative photoreceptors to be started from the corresponding relation between the receiving field angle and the photoreceptors according to the target receiving field angle. And starting the alternative photoreceptor to adjust the receiving angle of view of the optical signal receiving assembly to the target receiving angle of view.
The number of the alternative photoreceptors is positively correlated with the size of a target receiving field angle, the alternative photoreceptors are photoreceptors in an open state in the optical signal receiving assembly, and the alternative photoreceptors in the open state can receive the optical signal receiving assembly reflected by the target object.
Optionally, the control circuit stores a corresponding relationship between the receiving angle of view and the photoreceptor in advance. After determining the target receiving angle of view, the control circuit may determine, according to the target receiving angle of view, a position of the candidate photoreceptor to be turned on in the optical signal receiving assembly from a correspondence between the receiving angle of view and the photoreceptor. After that, the control circuit 10 may transmit the first field angle signal to the photoreceptor drive circuit 50. The photoreceptor drive circuit 50 may supply a drive current to the alternative photoreceptor in response to the received first angle-of-view signal to turn on the alternative photoreceptor to adjust the receiving angle of view of the optical signal receiving element to the target receiving angle of view.
Alternatively, the photoreceptor drive circuit 50 may select one or more rows of photoreceptors in the optical signal receiving elements to be on, by row, starting with the middle row of optical signal receiving elements in response to the received first field angle signal.
Alternatively, the photoreceptor drive circuit 50 may turn on one or more photoreceptors in a column selected from the middle column of the optical signal receiving element in response to the received first angle-of-view signal.
Alternatively, the photoreceptor drive circuit 50 may determine a circular area with the center of the optical signal receiving element as a dot in response to the received first angle of view signal, and turn on the photoreceptor within the circular area.
Since the number of the alternative photoreceptors is positively correlated with the size of the target receiving field angle, that is, the larger the target receiving field angle is, the larger the number of the alternative photoreceptors is, the smaller the target receiving field angle is, and the smaller the number of the alternative photoreceptors is. The control circuit can dynamically adjust the number of the photoreceptors which can be started in the optical signal receiving assembly according to the receiving field angle, so that the power consumption of the projection equipment is reduced.
For example, it is assumed that M is 6 and N is 12, i.e., the optical signal receiving module 30 includes 6 × 12 photoreceptors. Fig. 9 to 11 show schematic diagrams of photoreceptor on-off states corresponding to different reception angles of view. Where 1 indicates that the photoreceptor is in an on state and 0 indicates that the photoreceptor is in an off state.
Referring to fig. 9, if the target receiving angle of view α is 30 degrees, the control circuit may determine that the candidate photoreceptors are 6 × 12 photoreceptors in the optical signal receiving assembly according to the target receiving angle of view 30 degrees, and may activate the 6 × 12 candidate photoreceptors to make the 6 × 12 candidate photoreceptors in an on state.
Referring to fig. 10, if the target receiving angle α is 25 degrees, the control circuit determines that the candidate photoreceptors corresponding to the target receiving angle α of 25 degrees are photoreceptors in the second to fifth rows of the optical signal receiving assembly. The control circuit may activate the alternative photoreceptor such that the alternative photoreceptor is in an on state and the photoreceptors in the remaining rows of the light signal receiving assembly are in an off state.
Referring to fig. 11, if the target receiving angle α is 15 degrees, the control circuit may determine that the candidate photoreceptor corresponding to the target receiving angle α of 15 degrees is the photoreceptors in the third row and the fourth row in the optical signal receiving assembly, and thus the control circuit may activate the candidate photoreceptor to make the candidate photoreceptor in an open state and the photoreceptors in the remaining rows in the optical signal receiving assembly in a closed state.
As another alternative implementation of the present disclosure, referring to fig. 6 and 8, the projection apparatus may further include an aperture 60 and an aperture driving circuit 70, the aperture driving circuit 70 is respectively connected to the aperture 60 and the control circuit 10, and the aperture 60 is located on a side of the optical signal receiving assembly 30 away from the projection screen 04. The shape of the aperture 60 may be circular or rectangular.
In this disclosure, in step 401, after receiving the start instruction sent by the multimedia control component 40, the control circuit may further send a second field angle signal to the optical signal receiving component in response to the start instruction, so as to control all the photoreceptors in the optical signal receiving component to be turned on, so that all the photoreceptors in the optical signal receiving component are in a turned-on state. The control circuit may adjust the light entering amount of the aperture so as to adjust the angle of view of the optical signal receiving module to the target reception angle of view, in accordance with the target reception angle of view after determining the target reception angle of view.
Alternatively, referring to fig. 6, the control circuit 10 may send the second field angle signal to the optical signal receiving assembly 30 in response to the start instruction, so as to control the plurality of photoreceptors in the optical signal receiving assembly 30 to be all turned on. After determining the target reception field angle, the control circuit 10 may transmit an aperture driving current signal to the aperture driving circuit 70 according to the target reception field angle. The diaphragm drive circuit 70 may provide a diaphragm drive current to the diaphragm 60 in response to the diaphragm drive current signal. The diaphragm 60 can adjust the light incident amount of the diaphragm 60 by driving the diaphragm driving current to adjust the receiving angle of view of the optical signal receiving element to the target receiving angle of view.
Wherein the duty ratio of the diaphragm driving current signal is positively correlated with the magnitude of the target receiving field angle, the magnitude of the diaphragm driving current is positively correlated with the duty ratio of the diaphragm driving current signal, and the magnitude of the light input quantity is positively correlated with the magnitude of the diaphragm driving current. That is, the magnitude of the light incident amount is positively correlated with the magnitude of the target reception angle of view, and the larger the target reception angle of view is, the larger the light incident amount of the aperture is, the more photoreceptors can receive the optical signal reflected by the target object in the corresponding optical signal receiving module.
In the embodiment of the present disclosure, since each of the plurality of photoreceptors included in the optical signal receiving assembly is in an open state, the receiving angle of view of the optical signal receiving assembly can be adjusted by adjusting the size of the aperture, thereby adjusting the photoreceptor capable of receiving the optical signal reflected by the target object among the plurality of photoreceptors.
For example, assuming that the aperture has a rectangular shape, M is 6, and N is 12, that is, the optical signal receiving assembly 30 includes 6 × 12 photoreceptors, if the target receiving angle of view is 30, the control circuit may adjust the light entering amount of the aperture according to the target receiving angle of view, so that all of the 6 × 12 photoreceptors included in the optical signal receiving assembly 30 can receive the optical signal reflected by the target object. When the target receiving angle of view is 25 degrees, the control circuit adjusts the light entering amount of the diaphragm according to the target receiving angle of view so that the photoreceptors in the second to fifth rows in the optical signal receiving unit 30 can receive the optical signals reflected by the target. When the target receiving angle of view is 15 degrees, the control circuit adjusts the light entering amount of the diaphragm according to the target receiving angle of view, so that the photoreceptors on the third row and the fourth row in the optical signal receiving assembly can receive the optical signals reflected by the target object.
Optionally, the aperture is continuously opened or closed under the driving of the aperture driving current, so as to adjust the light entering amount of the aperture, where the light entering amount of the aperture is positively correlated with the opening times of the aperture in unit time, that is, the larger the light entering amount of the aperture is, the more the opening times of the aperture in unit time is.
In the embodiment of the disclosure, when the control circuit detects that the opening times of the diaphragm in unit time is greater than the time threshold, the control circuit may reduce the duty ratio of the diaphragm driving current signal provided to the diaphragm driving circuit, thereby reducing the diaphragm driving current provided by the diaphragm driving circuit to the diaphragm, and avoiding the situation that the diaphragm is damaged due to too many opening times in unit time. The number threshold is a fixed number of times stored in the control circuit in advance.
Optionally, a damping coil is arranged inside the aperture, and the damping coil is connected with a current sensor. When the control circuit detects that the electromotive force on the damping coil exceeds the electromotive force threshold value, the control circuit can determine that the opening times of the diaphragm in unit time exceeds the number threshold value, and then the control circuit can reduce the duty ratio of a diaphragm driving current signal provided for the diaphragm driving circuit, and further reduce the diaphragm driving current provided for the diaphragm. The damping coil functions to smoothly control the aperture.
And step 406, determining a target response level corresponding to the target distance range where the target distance is located from the corresponding relationship between the distance range and the response level.
In the embodiment of the present disclosure, the control circuit stores the corresponding relationship between the distance range and the response level in advance, and in step 404, after determining the target distance range where the target distance is located, the control circuit may further determine the target response level corresponding to the target distance range from the corresponding relationship between the distance range and the response level.
For example, assuming that the correspondence relationship between the distance range and the response level is shown in table 2, if the target distance is 0.7m, the target distance is within the target distance range (0,0.7 m), the target response level corresponding to the target distance range (0,0.7 m) is determined to be 1 from table 2, if the target distance is 1m, the target distance is within the target distance range (0.7m, 1 m), the target response level corresponding to the target distance range (0.7m, 1 m) is determined to be 2 from table 2, if the target distance is 1.3m, the target distance is within the target distance range (1m, 1.3 m), the target response level corresponding to the target distance range (1m, 1.3 m) is determined to be 3 from table 2.
TABLE 2
Range of distances Response level
(0，0.7m] 1
(0.7m，1m] 2
(1m，1.3m] 3
Step 407, adjusting the brightness of the laser light source according to the target response level.
The control circuit may store a correspondence between the response level and the luminance in advance. After determining the target response level, the control circuit may determine, according to the target response level, target brightness corresponding to the target response level from the correspondence between the response level and the brightness, and further adjust the brightness of the laser light source to the target brightness, where the target brightness is inversely related to the target response level.
Since the target distance is inversely related to the target response level and the target brightness is inversely related to the target response level, that is, the shorter the target distance is, the higher the target response level is, the lower the target brightness is, and thus when the target is closer to the projection apparatus, the brightness of the laser light source can be reduced, thereby improving the reliability of protecting the target. And the response level can be dynamically adjusted according to the distance, so that the brightness of the laser light source is dynamically adjusted, and the flexibility of protecting the target object is improved.
For example, assuming that the correspondence relationship between the response level and the luminance is shown in table 3, when the target response level is 1, the target luminance corresponding to the target response level 1 is determined to be 0 from table 3, and the luminance of the laser light source can be adjusted to 0. If the target response level is 2, the target brightness corresponding to the target response level 2 is determined from table 3 to be 50% of the initial brightness, and the brightness of the laser light source may be adjusted to be 50% of the initial brightness. If the target response level is 3, the target brightness corresponding to the target response level 3 is determined from table 3 to be 80% of the initial brightness, and the brightness of the laser light source may be adjusted to be 80% of the initial brightness. The initial brightness is the brightness of normal light emission of the laser light source.
TABLE 3
Response level Brightness of light
1 0
2 50% of the initial brightness
3 80% of the initial brightness
In the disclosed embodiment, referring to fig. 1, the multimedia control assembly 40 may include a first logic control circuit 401 and a multimedia driving subassembly 402. The first logic control circuit 401 is connected to the control circuit 10 and the multimedia driving subassembly 402, respectively. The projection device may further include a backlight control assembly 80, a light source driving assembly 90, and a laser light source 100. The laser light source 100 is used to emit laser light. The backlight control assembly 80 may include a display driving circuit 801 and a second logic control circuit 802. The second logic control circuit 802 is connected to the display driving circuit 801 and the multimedia driving sub-assembly 402 via an integrated circuit bus (I2C).
After determining the target brightness, the control circuit 10 may send the target brightness to the multimedia driving sub-assembly 402 through the first logic control circuit 401, and the multimedia driving sub-assembly 402 sends the target brightness to the display driving circuit 801 through the second logic control circuit. The display driving circuit 801 adjusts the duty ratio of the light source driving current signal transmitted to the light source driving unit 90 according to the target brightness, thereby adjusting the light source driving current supplied to the laser light source by the light source driving unit 90. For example, the display driving circuit 801 may reduce the duty ratio of the light source driving current signal sent to the light source driving assembly 90, thereby reducing the light source driving current provided by the light source driving assembly 90 to the laser light source 100, thereby reducing the brightness of the projection screen.
It should be noted that, the order of the steps of the viewing angle adjusting method provided by the embodiment of the present disclosure may be appropriately adjusted, and the steps may also be deleted according to the situation. For example, steps 406 and 407 may be deleted as appropriate. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.
In summary, the embodiments of the present disclosure provide a viewing angle adjusting method, which can adjust a receiving viewing angle of an optical signal receiving assembly according to a target distance between a target object and a projection apparatus. Because the size of the adjusted receiving field angle is inversely related to the length of the target distance, when the target object is closer to the projection device, the larger receiving field angle can increase the detection range of the optical signal receiving assembly, so that the detection range of the target object is more comprehensive, and the reliability of the detection of the target object is improved. In addition, since the receiving angle of view of the optical signal receiving module can be dynamically adjusted according to the distance, flexibility in detecting the target object is improved. And because the target distance between the projection device and the target object can be detected, the method can detect a static person. Meanwhile, the brightness of the laser light source can be adjusted according to the target distance, so that human eyes are effectively protected.
The embodiment of the present disclosure also provides a projection device, and referring to fig. 1 and fig. 2, the projection device may include a control circuit 10, and an optical signal transmitting assembly 20 and an optical signal receiving assembly 30 disposed on a host side of the projection device, where the optical signal transmitting assembly 20 and the optical signal receiving assembly 30 are disposed on an upper surface or a front side surface of a housing 00 of the projection device, and the optical signal receiving assembly 30 may include a plurality of photoreceptors.
The optical signal emitting assembly 20 is configured to emit an optical signal along a predetermined field angle range.
The optical signal receiving module 30 is configured to receive an optical signal reflected by a target object in front of or at a side of the projection apparatus.
And, also include the control circuit 10, the control circuit 10 is connected with optical signal emission assembly 20 and optical signal receiving assembly 30 separately. The control circuit 10 is configured to determine a target distance between the target object and the projection apparatus according to the light output time value of the light signal emitting module 20 and the light receiving time value of the light signal receiving module 30.
And the control circuit is also used for adjusting the receiving field angle of the optical signal receiving assembly according to the target distance, and the size of the receiving field angle is inversely related to the length of the target distance.
And, the optical signal receiving assembly 30 is further configured to receive the optical reflection signal at the adjusted receiving field angle.
And the control circuit 10 is further configured to adjust the brightness of the laser light source according to the target distance.
In summary, the embodiments of the present disclosure provide a projection apparatus, in which a control circuit may adjust a field angle of an optical signal receiving assembly according to a target distance between a target object and the projection apparatus. Because the size of the adjusted receiving field angle is inversely related to the length of the target distance, when the target object is closer to the projection device, the larger receiving field angle can increase the detection range of the optical signal receiving assembly, so that the detection range of the target object is more comprehensive, and the reliability of the detection of the target object is improved. In addition, since the receiving angle of view of the optical signal receiving module can be dynamically adjusted according to the distance, flexibility in detecting the target object is improved. Meanwhile, the brightness of the laser light source can be adjusted according to the target distance, so that human eyes are effectively protected.
Optionally, the control circuit 10 is configured to determine, according to the target distance, a target receiving field angle corresponding to the target distance range where the target distance is located from the corresponding relationship between the distance range and the receiving field angle. The receiving angle of view of the optical signal receiving module is adjusted to a target receiving angle of view.
Alternatively, referring to fig. 5, the projection apparatus may further include a photoreceptor drive circuit 50 connected to the control circuit 10 and the optical signal receiving element 30, respectively.
And the control circuit 10 is configured to determine, according to the target receiving angle of view, candidate photoreceptors to be turned on from the correspondence between the receiving angle of view and the photoreceptors, and transmit a first angle of view signal to the photoreceptor driving circuit 50, where the number of the candidate photoreceptors is positively correlated with the size of the target receiving angle of view.
And a photoreceptor driving circuit 50 for supplying a driving current to the alternative photoreceptor in response to the received first angle of view signal, and turning on the alternative photoreceptor to adjust the receiving angle of view of the optical signal receiving assembly 30 to the target receiving angle of view.
Alternatively, referring to fig. 6, the projection apparatus may further include an aperture 60 and an aperture driving circuit 70, the aperture driving circuit 70 being connected to the aperture 60 and the control circuit 10, respectively, the aperture 60 being located on a side of the optical signal receiving assembly 30 away from the projection screen.
The control circuit 10 is also configured to:
in response to the start instruction, a second field angle signal is sent to the optical signal receiving assembly 30 to control the plurality of photoreceptors in the optical signal receiving assembly 30 to be all opened.
The aperture driving circuit 70 transmits an aperture driving current signal according to the target reception field angle, the duty ratio of which is positively correlated with the magnitude of the target reception field angle.
And a diaphragm driving circuit 70 for supplying a diaphragm driving current to the diaphragm 60 in response to the diaphragm driving current signal, the magnitude of the diaphragm driving current being positively correlated with the duty ratio of the diaphragm driving current signal. In the embodiment of the disclosure, the aperture control circuit mainly has two methods of video control and direct current control.
The diaphragm 60 is driven by a diaphragm driving current to adjust the light incident amount of the diaphragm so as to adjust the reception angle of the optical signal receiving unit 30 to a target reception angle, and the magnitude of the light incident amount is positively correlated with the magnitude of the diaphragm driving current.
Referring to fig. 12, the control circuit 10 may include a conversion sub-circuit 11, a first comparison sub-circuit 12, a second comparison sub-circuit 13, and a third comparison sub-circuit 14. Each of the comparison sub-circuits is connected to the conversion sub-circuit 11, the diaphragm driving circuit 70 and a degeneration resistance Rf, respectively. The conversion sub-circuit 11 is used for converting the target distance into an output voltage and transmitting the output voltage to the three comparison sub-circuits. Each of the comparison sub-circuits is configured to compare the output voltage with a reference voltage stored in advance thereof, and output a diaphragm driving current signal to the diaphragm driving circuit 70, so that the diaphragm driving circuit 70 supplies a diaphragm driving current to the diaphragm 60.
The reference voltage stored in each comparison circuit may be obtained according to an upper limit value or a lower limit value of different distance ranges. For example, the first reference voltage stored in the first comparison sub-circuit 12 may be obtained from the upper limit value of 0.7m of the distance range (0,0.7m ], the second reference voltage stored in the second comparison sub-circuit 13 may be obtained from the upper limit value of 1m of the distance range (0.7m, 1 m), and the third reference voltage stored in the third comparison circuit 14 may be obtained from the upper limit value of 1.3m of the distance range (1m, 1.3 m).
The diaphragm driving circuit 70 is generally required to adjust the diaphragm driving current to a desired value in a short time in supplying the diaphragm driving current to the diaphragm 60 in order to adjust the angle of view of the optical signal receiving element 30 to the target receiving angle of view. The aperture 60, the optical signal receiving module 30 and the converting sub-circuit 11 shown in fig. 12 can form a first-order closed-loop system, which has a better convergence performance, and can make the aperture driving current of the aperture converge to a desired value quickly, so as to converge the field angle of the optical signal receiving module to the target receiving field angle quickly, and further make the performance of the system faster and more stable.
Fig. 13 is a schematic diagram of an aperture adjustment process provided in an embodiment of the present disclosure. The diagram comprises a first curve representing an underdamped course, a second curve representing a critically damped course and a third curve representing an overdamped course. In the diagram, the horizontal axis represents time, and the vertical axis represents a diaphragm driving current supplied to the diaphragm. As can be seen from fig. 13, the second curve adjusts the diaphragm driving current of the diaphragm to a desired value i by a shorter time T1 than the first curve and the third curve in supplying the diaphragm driving current to the diaphragm. The diaphragm drive circuit 70 adjusts the diaphragm drive current to a desired value in a short time in supplying the diaphragm drive current to the diaphragm 60, thereby achieving critical damping.
Optionally, referring to fig. 12, the projection apparatus may further include a first inductor L1, a second inductor L2, a third inductor L3, and a capacitor C, one end of the second inductor L2 is connected to one end of the first inductor L1, and the other end of the second inductor L2 is connected to one end of the capacitor C. One end of the third inductor L3 is connected to the other end of the first inductor L1, the other end of the third inductor L3 is connected to the other end of the capacitor C, and each of the comparison circuits is connected to both ends of the capacitor. The second inductor L2 and the third inductor L3 are used for impedance matching.
After the control circuit 10 decreases the duty ratio of the diaphragm driving current signal supplied to the diaphragm driving circuit 70, and further decreases the diaphragm driving current supplied to the diaphragm 60, the control circuit 10 may compare the difference between the voltage across the capacitor C and the voltage supplied to the diaphragm 60 by the diaphragm driving circuit 70. If the difference is smaller than the difference threshold, the control circuit 10 may not decrease the duty ratio of the diaphragm driving current signal supplied to the diaphragm driving circuit 70.
Optionally, the control circuit 10 is further configured to:
and determining a target response grade corresponding to the target distance range in which the target distance is located from the corresponding relation between the distance range and the response grade.
And adjusting the brightness of the laser light source according to the target response level.
Optionally, the control circuit 10 is configured to:
the transmission time period of the optical signal is determined based on the optical output time value of the optical signal transmitting module 20 and the optical receiving time value of the optical signal receiving module 30.
And determining the target distance between the target object and the projection equipment according to the transmission speed and the transmission time length of the optical signal.
Alternatively, referring to fig. 5 and 6, the optical signal emitting assembly 20 may include a laser 22 and a laser driving assembly 21, and the laser driving assembly 21 is connected to the laser 22 and the control circuit 10, respectively.
The control circuit 10 is configured to send an enable signal and a laser drive current signal to the laser drive assembly 21 in response to a start instruction.
The laser drive assembly 21 is for providing a laser drive current to the laser in response to the enable signal and the laser drive current signal.
The laser 22 is used to emit an optical signal driven by a laser drive current.
In the embodiment of the present disclosure, referring to fig. 5 and 6, the projection apparatus may further include an optical lens 120, a filter component 110, and a data processing component 140, where the optical lens 120 is used for collimating the detection light emitted by the laser 22. The filter assembly 110 is located on a side of the optical signal receiving assembly 30 away from the projection screen, and is used for filtering out light with a wavelength different from that of the detected light. Namely, the filtering component can filter out the light reflected by the non-human body and the ambient light.
The data processing assembly 140 may include an optical signal analysis subassembly and a photoelectric conversion subassembly. The optical signal analysis subassembly is used for determining the number of target photoreceptors which can be lightened after the photoreceptors in the opening state in the optical signal receiving assembly receive the optical signals reflected by the target object. And sending the number to a photoelectric conversion sub-assembly, wherein the photoelectric conversion sub-assembly is used for converting the number into a digital electric signal and sending the digital electric signal to a control circuit, and the control circuit can obtain the number of the target photoreceptors according to the digital electric signal.
In the disclosed embodiment, referring to fig. 1, the multimedia control component 40 may further include a first memory 403. The first memory 403 may be used to store an image to be projected for display. The multimedia driver subcomponent 402 may include an application layer 4021, a framework layer 4022, a driver layer 4023, and a boot layer 4024. The application layer 4021, the frame layer 4022, the driver layer 4023, and the guide layer 4024 can transmit an image to be projected and displayed to the second logic control circuit 802 and further to the display driver circuit 801.
It is assumed that the laser light source 100 includes a red laser, a green laser component, a blue laser component, and a yellow laser component. The light-emitting side of each laser is provided with a glass lens with a light combination function. The display driving circuit 801 may output a red PWM signal R _ PWM corresponding to the red laser device based on the red primary color component of the image to be displayed, output a green PWM signal G _ PWM corresponding to the green laser device based on the green primary color component of the image to be displayed, output a blue PWM signal B _ PWM corresponding to the blue laser device based on the blue primary color component of the image to be displayed, and output a yellow PWM signal Y _ PWM corresponding to the yellow laser device based on the yellow primary color component of the image to be displayed. The display driving circuit 801 may output an enable signal R _ EN corresponding to the red laser element based on a lighting period of the red laser element in the driving period, output an enable signal G _ EN corresponding to the green laser element based on a lighting period of the green laser element in the driving period, and output an enable signal B _ EN corresponding to the blue laser element based on a lighting period of the blue laser element in the driving period. Based on the lighting time period of the yellow laser component in the driving period, the enable signal Y _ EN corresponding to the yellow laser component is output.
The backlight control assembly 80 may further comprise a second memory 803, the second memory 803 being used for storing primary color gradation values of pixels in the image to be projected. The display driving circuit 801 is further configured to obtain the stored primary color level values of the pixels in the image to be projected from the second memory, and control the light valve to turn over according to the primary color level values of the pixels in the image to be projected, so as to project and display the image to be projected onto the projection screen.
In summary, the embodiments of the present disclosure provide a projection apparatus, in which a control circuit may adjust a field angle of an optical signal receiving assembly according to a target distance between a target object and the projection apparatus. Because the size of the adjusted field angle is inversely related to the length of the target distance, when the target object is closer to the projection device, the larger field angle can enlarge the detection range of the optical signal receiving assembly, so that the detection range of the target object is more comprehensive, and the reliability of the detection of the target object is improved. In addition, since the angle of view of the optical signal receiving module can be dynamically adjusted according to the distance, flexibility in detecting the target object is improved. Meanwhile, the brightness of the laser light source can be adjusted according to the target distance, so that human eyes are effectively protected.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (12)

1. A projection device, characterized in that the projection device comprises:
the optical signal transmitting assembly and the optical signal receiving assembly are arranged on one side of a host of the projection equipment, the optical signal transmitting assembly and the optical signal receiving assembly are arranged on the upper surface or the front side surface of a shell of the projection equipment, and the optical signal receiving assembly comprises a plurality of photoreceptors;
the optical signal transmitting assembly is used for transmitting an optical signal along a preset field angle range;
the optical signal receiving component is used for receiving the optical signal reflected by a target object in front of or at the side of the projection equipment;
the control circuit is respectively connected with the optical signal transmitting assembly and the optical signal receiving assembly; the system comprises a light signal emitting component, a light signal receiving component and a control component, wherein the light signal emitting component is used for emitting light signals to the light signal receiving component;
the control circuit is further configured to adjust a receiving field angle of the optical signal receiving component according to the target distance, where a size of the receiving field angle is inversely related to a length of the target distance;
and the optical signal receiving component is also used for receiving the optical reflection signal at the adjusted receiving angle of view,
and the control circuit is also used for adjusting the brightness of the laser light source according to the target distance.
2. The projection apparatus according to claim 1, wherein the control circuit is configured to determine, according to the target distance, a target receiving field angle corresponding to a target distance range in which the target distance is located from a correspondence relationship between a distance range and a receiving field angle; and adjusting the receiving field angle of the optical signal receiving assembly to the target receiving field angle.
3. The projection device of claim 2, wherein the projection device further comprises: the photoreceptor driving circuit is respectively connected with the control circuit and the optical signal receiving assembly;
the control circuit is used for determining alternative photoreceptors to be started from the corresponding relation between the receiving field angle and the photoreceptors according to the target receiving field angle and transmitting a first field angle signal to the photoreceptor driving circuit, wherein the number of the alternative photoreceptors is positively correlated with the size of the target receiving field angle;
and the photoreceptor driving circuit is used for responding to the received first angle of view signal, providing a driving current for the alternative photoreceptor, and opening the alternative photoreceptor so as to adjust the receiving angle of view of the optical signal receiving assembly to the target receiving angle of view.
4. The projection device of claim 2, wherein the projection device further comprises: the diaphragm is positioned on one side, far away from the projection screen, of the optical signal receiving assembly;
the control circuit is further configured to:
responding to a starting instruction, and sending a second field angle signal to the optical signal receiving assembly so as to control a plurality of photoreceptors in the optical signal receiving assembly to be opened;
transmitting an aperture driving current signal to the aperture driving circuit according to the target receiving field angle, wherein the duty ratio of the aperture driving current signal is positively correlated with the size of the target receiving field angle;
the diaphragm driving circuit is used for responding to the diaphragm driving current signal and providing diaphragm driving current to the diaphragm, and the magnitude of the diaphragm driving current is in positive correlation with the duty ratio of the diaphragm driving current signal;
the aperture is used for adjusting the light incoming quantity of the aperture under the driving of the aperture driving current so as to adjust the receiving angle of view of the optical signal receiving assembly to the target receiving angle of view, and the magnitude of the light incoming quantity is positively correlated with the magnitude of the aperture driving current.
5. The projection device of any of claims 1-3, wherein the control circuit is further configured to:
determining a target response grade corresponding to a target distance range where the target distance is located from the corresponding relation between the distance range and the response grade;
and adjusting the brightness of the projection screen according to the target response level.
6. The projection device of any of claims 1-4, wherein the control circuit is configured to:
determining the transmission duration of the optical signal according to the optical output time value of the optical signal transmitting assembly and the optical receiving time value of the optical signal receiving assembly;
and determining the target distance between the target object and the projection equipment according to the transmission speed and the transmission time length of the optical signal.
7. The projection device of any of claims 1-4, wherein the optical signal emitting assembly comprises: the laser driving component is respectively connected with the laser and the control circuit;
the control circuit is used for responding to a starting instruction and sending an enabling signal and a laser driving current signal to the laser driving component;
the laser driving component is used for responding to the enabling signal and the laser driving current signal and providing laser driving current for the laser;
the laser is used for emitting optical signals under the driving of the laser driving current.
8. A method for adjusting a field angle, the method being applied to a control circuit of a projection apparatus, the projection apparatus further comprising: the projection device comprises an optical signal transmitting assembly and an optical signal receiving assembly which are arranged on one side of a host of the projection device, wherein the optical signal transmitting assembly and the optical signal receiving assembly are arranged on the upper surface or the front side surface of a shell of the projection device, the optical signal receiving assembly comprises a plurality of photoreceptors, the control circuit is respectively connected with the optical signal transmitting assembly and the optical signal receiving assembly, and the method comprises the following steps:
determining a target distance between the target object and the projection equipment according to the light output time value of the light signal emitting assembly and the light receiving time value of the light signal receiving assembly;
adjusting a receiving field angle of the optical signal receiving assembly according to the target distance, wherein the size of the receiving field angle is inversely related to the length of the target distance, so that the optical signal receiving assembly receives the optical reflection signal at the adjusted receiving field angle;
and adjusting the brightness of the laser light source according to the target distance.
9. The method of claim 8, wherein the adjusting the receiving field angle of the optical signal receiving assembly according to the target distance comprises:
according to the target distance, determining a target receiving field angle corresponding to the target distance range where the target distance is located from the corresponding relation between the distance range and the receiving field angle; and adjusting the receiving field angle of the optical signal receiving assembly to the target receiving field angle.
10. The method of claim 9, wherein the projection device further comprises: the photoreceptor driving circuit is respectively connected with the control circuit and the optical signal receiving assembly;
the adjusting the receiving field angle of the optical signal receiving assembly to the target receiving field angle includes:
according to the target receiving field angle, determining alternative photoreceptors to be started from the corresponding relation between the field angle receiving and the photoreceptors, wherein the number of the alternative photoreceptors is positively correlated with the size of the target receiving field angle;
and transmitting a first field angle signal to the photoreceptor driving circuit, wherein the first field angle signal is used for controlling the photoreceptor driving circuit to provide driving current for the alternative photoreceptor so as to turn on the alternative photoreceptor and adjust the receiving field angle of the optical signal receiving assembly to the target receiving field angle.
11. The method of claim 9, wherein the projection device further comprises: the diaphragm driving circuit is respectively connected with the diaphragm and the control circuit, and the diaphragm is positioned on one side of the optical signal receiving assembly, which is far away from the projection screen;
before adjusting the receiving field angle of the optical signal receiving assembly to the target receiving field angle, the method further comprises:
responding to a starting instruction, and sending a second field angle signal to the optical signal receiving assembly so as to control the plurality of photoreceptors in the optical signal receiving assembly to be opened;
the adjusting the receiving field angle of the optical signal receiving assembly to the target receiving field angle includes:
transmitting an aperture driving current signal to the aperture driving circuit according to the target receiving field angle, wherein the aperture driving current signal is used for indicating the aperture driving circuit, providing an aperture driving current to the aperture so as to adjust the light incoming quantity of the aperture, and adjusting the receiving field angle of the optical signal receiving assembly to the target receiving field angle;
wherein a duty ratio of the diaphragm driving current signal is positively correlated with a magnitude of the target reception field angle, a magnitude of the diaphragm driving current is positively correlated with the duty ratio of the diaphragm driving current signal, and a magnitude of the light intake amount is positively correlated with the magnitude of the diaphragm driving current.
12. The method according to claims 8 to 11, wherein the adjusting the brightness of the laser light source according to the target distance comprises:
determining a target response grade corresponding to a target distance range where the target distance is located from the corresponding relation between the distance range and the response grade;
and adjusting the brightness of the laser light source according to the target response level.
CN202010419446.3A 2020-05-18 2020-05-18 Projection equipment and field angle adjusting method thereof Active CN113691787B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202010419446.3A CN113691787B (en) 2020-05-18 2020-05-18 Projection equipment and field angle adjusting method thereof
CN202211167587.6A CN115802015A (en) 2020-05-18 2020-05-18 Projection equipment and field angle adjusting method thereof
CN202180036211.9A CN115516852B (en) 2020-05-18 2021-04-23 Projection device and field angle adjusting method thereof
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