CN113382216B - Laser projection system and method for controlling ascending and descending of projection screen - Google Patents
Laser projection system and method for controlling ascending and descending of projection screen Download PDFInfo
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- CN113382216B CN113382216B CN202010115275.5A CN202010115275A CN113382216B CN 113382216 B CN113382216 B CN 113382216B CN 202010115275 A CN202010115275 A CN 202010115275A CN 113382216 B CN113382216 B CN 113382216B
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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]
- H04N9/3179—Video signal processing therefor
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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
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
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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
- H04N9/3161—Modulator illumination systems using laser light sources
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Projection Apparatus (AREA)
Abstract
The application discloses a laser projection system and a method for controlling ascending and descending of a projection screen, and belongs to the technical field of laser projection. The laser projection system includes: projection display module, projection screen, control assembly and pivot. When the laser projection system is not used, the rotating shaft is driven to rotate through the control assembly, so that the projection screen is wound on the rotating shaft, the occupied space of the projection screen is effectively reduced, and the whole occupied space of the laser projection system is further reduced. And in the process that the control component drives the projection screen to lift, the projection display module can adjust the image content in the image to be projected, which is currently projected by the projection display module, based on the real-time lifting process parameter of the projection screen, so that the boundary of the effective content area in the image to be projected is overlapped with the boundary of the unfolded projection screen as much as possible.
Description
Technical Field
The application relates to the technical field of laser projection, in particular to a laser projection system and a method for controlling the ascending and descending of a projection screen.
Background
The laser projection system comprises a projection screen and a laser projection host, and is used for realizing functions such as video playing and the like.
The laser projection host adopts a laser light source, and the laser light source has the advantages of good monochromaticity, high brightness and the like, so that the projection picture also has richer colors, better brightness and contrast, and higher projection picture quality. However, the traditional projection curtain adopts a diffuse reflection light-emitting mode, so that the gain is low, and the picture advantage brought by the laser light source cannot be well restored.
Therefore, laser projection devices are often equipped with specialized optical screens, such as fresnel screens, including multilayer optical films, with high gain, particularly for reflection of light rays obliquely incident on ultra-short focal projection. Along with the increase of projection size, the optical screen is also increased to match with the picture, the size of the optical film is also increased, the optical film is larger in size, but the rigidity of the optical film is limited, a backboard or a frame with the same area is generally required to be arranged for supporting, the fixation of the optical film is realized, the flatness of the optical film is maintained (which is very important for the display of a projection picture), and the whole projection screen occupies a larger plane space.
The supporting structure of the projection screen is usually fixed on the wall surface or the supporting medium by a screw punching mode, and is a lossy fixation. It is not easy to move once it is fixed.
In addition, for the ultra-short focal laser projection system, the requirement of the projection ratio is met, the position and the distance between the laser projection host and the projection screen are fixed, if the projection host shifts, the reset needs to be debugged again, and the specificity of the ultra-short focal imaging increases the debugging difficulty. Therefore, the whole laser projection system in the prior art occupies a larger space, and simultaneously brings a plurality of limitations to the use of users.
Disclosure of Invention
The embodiment of the application provides a laser projection system with a receivable projection screen and good user experience, and a method for controlling the ascending and descending of the projection screen, wherein the technical scheme is as follows:
in one aspect, a laser projection system is provided, comprising: the device comprises a projection display module, a projection screen, a control assembly and a rotating shaft, wherein the control assembly is connected with the projection display module, and the rotating shaft is fixedly connected with one end of the projection screen;
the control assembly is used for: the rotating shaft is driven to rotate so as to drive the projection screen to be wound on the rotating shaft or unfolded from the rotating shaft, so that the projection screen is lifted;
the projection display module is used for: acquiring real-time lifting process parameters of the projection screen in the process that the control assembly drives the projection screen to lift;
based on the real-time lifting process parameters of the projection screen, adjusting the image content in the image to be projected, which is currently projected to the surface of the projection screen by the projection display module; wherein the image to be projected includes the effective content area and the ineffective content area.
On the other hand, a method for controlling the elevation of a projection screen is provided, which is applied to the laser projection system, and the laser projection system comprises: the device comprises a projection display module, a projection screen, a control assembly and a rotating shaft, wherein the control assembly is connected with the projection display module, and the rotating shaft is fixedly connected with one end of the projection screen; the method comprises the following steps:
after the laser projection system receives a starting-up instruction, the control assembly drives the rotating shaft to rotate so as to drive the projection screen to wind and unwind from the rotating shaft, so that the projection screen ascends, and meanwhile, the real-time lifting process parameters of the projection screen are obtained;
the projection display module adjusts the image content in the image to be projected, which is currently projected to the surface where the projection screen is positioned, based on the real-time lifting process parameters of the projection screen; wherein the image to be projected includes the effective content area and the ineffective content area.
In still another aspect, a method for controlling descent of a projection screen is provided, which is applied to the above laser projection system, and the laser projection system includes: the device comprises a projection display module, a projection screen, a control assembly and a rotating shaft, wherein the control assembly is connected with the projection display module, and the rotating shaft is fixedly connected with one end of the projection screen; the method comprises the following steps:
after the laser projection system receives a shutdown instruction, the control component drives the rotating shaft to rotate so as to drive the projection screen to wind on the rotating shaft, so that the projection screen descends, and meanwhile, the real-time lifting process parameters of the projection screen are obtained;
the projection display module adjusts the image content in the image to be projected, which is currently projected to the surface where the projection screen is positioned, based on the real-time lifting process parameters of the projection screen; wherein the image to be projected includes the effective content area and the ineffective content area.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
when the laser projection system is not used, the rotating shaft is driven to rotate through the control assembly, so that the projection screen is wound on the rotating shaft, the occupied space of the projection screen is effectively reduced, and the whole occupied space of the laser projection system is further reduced. And the projection display module can adjust the image content in the image to be projected, which is currently projected by the projection display module, based on the real-time lifting process parameter of the projection screen in the process that the control component drives the projection screen to lift, so that the boundary of the effective content area in the image to be projected is overlapped with the boundary of the unfolded projection screen as much as possible, and the display effect of the projection content displayed by the projection screen in the process that the projection screen lifts is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a laser projection system provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of an image to be projected according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a laser projection system according to an embodiment of the present application;
FIG. 4 is a side view of the laser projection system shown in FIG. 3;
FIG. 5 is a schematic diagram of another laser projection system according to an embodiment of the present application;
FIG. 6 is an effect diagram of a projection screen in a fully extended state according to an embodiment of the present application;
FIG. 7 is an effect diagram of another projection screen provided by an embodiment of the present application in a fully extended state;
FIG. 8 is a schematic diagram of another laser projection system according to an embodiment of the present application;
FIG. 9 is a block diagram of another laser projection system through which embodiments of the present application pass;
FIG. 10 is a flowchart of a method for controlling the elevation of a projection screen according to an embodiment of the present application;
fig. 11 is a flowchart of another method for controlling the lifting of a projection screen according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a block diagram of a laser projection system according to an embodiment of the application. The laser projection system 00 may be a laser television, and the laser projection system 00 may include: projection display module 10, projection screen 20, control assembly 30, and spindle 40.
The control assembly 30 may be coupled to the projection display module 10, illustratively, the control assembly 30 establishes a communication link with the projection display module 10. The communication connection means a connection established by wire or wireless. For example, the control assembly 30 may be communicatively coupled to the projection display module 10 using an RS232 communication scheme.
The rotating shaft 40 is fixedly connected to one end of the projection screen 20. The control assembly 30 may also be coupled to a spindle 40. The control assembly 30 is for: the rotation shaft 40 is driven to rotate to drive the projection screen 20 to be wound on the rotation shaft 40 or to be unfolded from the rotation shaft 40, so that the projection screen 20 is lifted. In the embodiment of the present application, since the projection screen 20 may be wound around the rotation shaft 40 or unwound from the rotation shaft 40, when the laser projection system 00 is used, the rotation shaft 40 is driven to rotate by the control assembly 30, so that the projection screen 20 is unwound from the rotation shaft 40; when the laser projection system 00 is not used, the control assembly 30 drives the rotating shaft 40 to rotate, so that the projection screen 20 is wound on the rotating shaft 40, the occupied space of the projection screen 20 is effectively reduced, and the whole occupied space of the laser projection system is further reduced.
The projection display module 10 is for: acquiring real-time lifting process parameters of the projection screen 20 in the process of driving the projection screen to lift by the control assembly 30; based on the real-time elevation process parameter of the projection screen 20, the image content in the image to be projected, which is currently projected by the projection display module 10 to the surface of the projection screen 20, is adjusted. The image to be projected includes an effective content area and an ineffective content area. For example, please refer to fig. 2, fig. 2 is a schematic diagram of an image to be projected according to an embodiment of the present application. The image to be projected includes: an effective content area 01 and an ineffective content area 02. The pixel value of each pixel in the invalid content region 02 is 0, that is, the image located in the invalid content region 02 is a black image. The image located in the effective content area 01 may be a black image or a color image, for example, when the image located in the effective content area 01 is a color image, at least a pixel having a pixel value greater than 0 is included in the effective content area 01.
In the embodiment of the present application, when the projection display module 10 projects a plurality of frames of images to be projected onto the projection screen 20, in order to enable the effective content area (i.e. the projection content displayed by the projection screen 20) to have the effect of lifting along with the lifting of the projection screen 20, the projection display module 10 needs to process the current image to be projected in real time based on the real-time lifting process parameters of the projection screen 20 in real time during the lifting process of the projection screen 20. When the projection display module 10 projects the current projection image, the boundary of the effective content area of the image to be projected may be made to coincide with the boundary of the expanded projection screen 20 as much as possible.
In summary, the laser projection system provided in the embodiment of the present application includes: projection display module, projection screen, control assembly and pivot. When the laser projection system is not used, the rotating shaft is driven to rotate through the control assembly, so that the projection screen is wound on the rotating shaft, the occupied space of the projection screen is effectively reduced, and the whole occupied space of the laser projection system is further reduced. And the projection display module can adjust the image content in the image to be projected, which is currently projected by the projection display module, based on the real-time lifting process parameter of the projection screen in the process that the control component drives the projection screen to lift, so that the boundary of the effective content area in the image to be projected is overlapped with the boundary of the unfolded projection screen as much as possible, and the display effect of the projection content displayed by the projection screen in the process that the projection screen lifts is improved.
In an embodiment of the present application, please refer to fig. 3 and fig. 4, fig. 3 is a schematic structural diagram of a laser projection system according to an embodiment of the present application, and fig. 4 is a side view of the laser projection system shown in fig. 3. The laser projection system 00 may further include: the case 50, the projection display module 10, the control assembly 30 and the spindle 40 are all located in the case 50. When projection screen 20 is fully wrapped around shaft 40 (i.e., projection screen 20 is in a fully retracted state), projection screen 20 is also positioned within box 50. Thus, the footprint of projection screen 20 may be further reduced, thereby further reducing the overall footprint of laser projection system 00.
In an embodiment of the present application, the projection display module 10 is implemented to obtain the real-time elevation process parameters of the projection screen 20. In the present application, the real-time lift schedule parameters of the projection screen 20 are used to characterize: as control assembly 30 normally drives projection screen 20 up and down, the projection screen 20 progresses in real time. It should be noted that, when control assembly 30 normally drives projection screen 20 up and down, the up and down speed of projection screen 20 is not uniform. The control assembly 30 may obtain the real-time lift schedule parameters of the projection screen 20 and then send the real-time lift schedule parameters of the projection screen 20 to the projection display module 10, so that the projection display module 10 may obtain the real-time lift schedule parameters of the projection screen 20. It should be noted that, there are various ways for the control module 30 to obtain the real-time lifting process parameters of the projection screen 20, and the following two possible implementations are schematically illustrated in the embodiments of the present application:
in a first alternative implementation, control assembly 30 may determine the ratio of the current expanded width of projection screen 20 to the maximum expanded width of projection screen 20 as the real-time lift-and-fall process parameter of projection screen 20.
For example, please refer to fig. 5, fig. 5 is a schematic diagram illustrating a structure of another laser projection system according to an embodiment of the present application. The laser projection system 00 may further include: a cassette 50, a plurality of reference structures 60, and a detector 70. A spindle 40 in the laser projection system 00 is located within the cassette 50. The detector 70 may be on the shaft 40 and directly opposite the plurality of reference structures 60. The plurality of reference structures 60 are located at the edge of the projection screen and are sequentially arranged along the lifting direction x of the projection screen 20, and it should be noted that the plurality of reference structures 60 are equally spaced, that is, the distance between any two adjacent reference structures is the same when the projection screen 20 is in the fully unfolded state. Because the plurality of reference structures 60 are equally spaced, control assembly 30 determines the current deployment width of projection screen 20 after determining the number of reference structures 60 located outside of box 50.
In the present application, the detector 70 is used to: the number of reference structures 60 located outside the cartridge 50 is detected and the number of reference structures 60 located outside the cartridge 50 is sent to the control assembly 30. The control assembly is used for: the number of reference structures 60 located outside of the cassette 50 is received and the current deployment width of the projection screen 20 is determined based on the number of reference structures 60 located outside of the cassette 50.
It should be noted that, since there are many possible implementations of the structure of the plurality of reference structures 60 in the present application, there are also many ways in which the detector 70 detects the number of reference structures 60 located outside the case, and the following two cases are taken as examples for illustrative purposes in the embodiments of the present application.
In the first case, please refer to fig. 6, fig. 6 is an effect diagram of a projection screen in a fully unfolded state according to an embodiment of the present application. The plurality of reference structures 60 on the edge of projection screen 20 may include: the first reference structures 601 and the second reference structures 602 are arranged at intervals, and the reflectivity of the first reference structures 601 is different from the reflectivity of the second reference structures 602. For example, the first reference structure 601 and the second reference structure 602 may have two reflection patterns having different reflectivities. For example, the first reference structure 601 may be a white pattern and the second reference structure 602 may be a black pattern.
In this case, the detector 70 may be a photosensor for emitting light, and receiving light. Illustratively, the detector 70 is configured to: emitting detection light to the plurality of reference structures 60; receiving detection light reflected by a plurality of reference structures, and generating a detection square wave signal based on the received detection light; based on the detected square wave signal, the number of first reference structures 601 and second reference structures 602 located outside the case 50 is determined.
In the embodiment of the present application, since the reflectivity of the first reference structure 601 is different from the reflectivity of the second reference structure 602, the intensity of the detection light reflected by the first reference structure 601 is different from the intensity of the detection light reflected by the second reference structure 602 after the detection light is emitted to the plurality of reference structures 60 by the detector 70. Thus, upon receiving detection light rays emitted through the plurality of reference structures 60 at the detector 70, the detector 70 may generate a detection square wave signal comprising first and second level signals that are spaced apart based on the received detection light rays. The first level signal is generated based on the detection light reflected by the first reference structure 601 and the second level signal is generated based on the detection light reflected by the second reference structure 602. The level of the first level signal is different from the level of the second level signal, and in general, if the reflectivity of the first reference structure 601 is greater than the reflectivity of the second reference structure 602, the level of the first level signal is higher than the level of the second level signal; if the reflectivity of the first reference structure 601 is smaller than the reflectivity of the second reference structure 602, the level of the first level signal is lower than the level of the second level signal.
It should be noted that, since the first reference structure 601 and the second reference structure 602 are both reflective patterns, and there is no gap between the adjacent first reference structure 601 and second reference structure 602, after the detector 70 sends the numbers of the first reference structure 601 and the second reference structure 602 located outside the box 50 to the control assembly 30, the control assembly 30 may calculate the current expansion width of the projection screen 20 based on the numbers of the first reference structure 601 and the second reference structure 602, and the lengths of the first reference structure 601 and the second reference structure 602. The length direction of the first reference structure 601 and the length direction of the second reference structure 602 are parallel to the lifting direction of the projection screen 20.
For example, control assembly 30 may calculate the current expanded width of projection screen 20 by a first expanded width calculation formula. The first expansion width calculation formula is as follows:
；
wherein h is 0 Is the current expanded width of projection screen 20; n is the number of first reference structures 601 located outside the cartridge 50; l (L) 1 For the length of each first reference structure 601; m is the number of second reference structures 602 located outside the cassette 50; l (L) 2 For the length of each second reference structure 602. The relationship between n and m is as follows: n=m, or, n=m±1.
In the second case, please refer to fig. 7, fig. 7 is an effect diagram of another projection screen provided in an embodiment of the present application in a fully unfolded state. Reference structure 60 on the edge of projection screen 20 may include: a sensor coupled to the detector 70. In an embodiment of the present application, each sensor may be communicatively coupled to the detector 70 by way of wireless communication.
In this case, the sensor is used to: when located outside of the cassette 50, a position signal is sent to the detector 70. The detector 70 is for: based on the received position signals, the number of sensors located outside the cassette 50 is determined.
In an embodiment of the present application, since the distance between any two adjacent sensors is the same, after the detector 70 transmits the number of sensors located outside the case 50 to the control unit 30, the control unit 30 may calculate the current spread width of the projection screen 20 based on the number of sensors located outside the case 50, as well as the length of the sensors and the distance between any two sensors. Wherein the length direction of the sensor is parallel to the elevation direction of the projection screen 20.
For example, control assembly 30 may calculate the current expanded width of projection screen 20 by a second expanded width calculation formula. The second expansion width calculation formula is:
；
wherein h is 0 Is the current expanded width of projection screen 20; k is the number of sensors located outside the cassette 50; l (L) 3 For the length of each sensor; l (L) 4 For the distance between any two sensors。
It should be noted that, for both the above two cases, the control component 30 can obtain the current expansion width of the projection screen 20, so as to determine the real-time lifting process parameter of the projection screen.
In a second alternative implementation, please refer to fig. 8, fig. 8 is a schematic structural diagram of yet another laser projection system according to an embodiment of the present application. The laser projection system 00 further includes: the motor 80 is driven. The drive motor 80 has a transmission shaft 801. The control assembly 30 in the laser projection system 00 can be connected with the driving motor 80, the transmission shaft 801 of the driving motor 80 can be connected with the rotating shaft 40, and the control assembly 30 can drive the rotating shaft 40 to rotate by controlling the rotation of the transmission shaft 801 of the driving motor 80, so as to drive the projection screen 20 to lift.
Alternatively, the driving motor 80 may be a stepping motor, which is a motor that drives the transmission shaft 801 to rotate step by step at a fixed angle (generally referred to as a step angle). In general, in the case where the type of the stepping motor is determined, the step angle of the stepping motor is also determined. For example, if the advance angle of the stepping motor is 7.5 °, when the stepping motor drives the transmission shaft 801 to rotate one turn, the transmission shaft 801 needs to perform 360 °/7.5 ° =48 step angles.
In this case, control assembly 30 may determine the ratio of the number of progress angles currently performed by transmission shaft 801 to the number of step angles that transmission shaft 801 needs to perform during the switch between the fully extended state and the fully retracted state of projection screen 20 as the real-time lift schedule parameter of projection screen 20.
In the embodiment of the present application, the number of progress angles performed by the transmission shaft 801 may be represented by the pulse quantity of the pulse signal. By way of example, the laser projection system 00 may further include: the control assembly 30 in the laser projection system 00 may also be coupled to a pulse encoder 90, and the pulse encoder 90 may be coupled to a transmission shaft 801 of the drive motor 80. For example, the pulse encoder 90 may be sleeved on the transmission shaft 801 such that, when the transmission shaft 801 rotates, the pulse encoder 90 can detect the number of pitch angles performed by the transmission shaft 801 to generate a corresponding pulse signal such that the pulse amount of the pulse signal produced by the pulse encoder can characterize the number of pitch angles performed by the transmission shaft 801.
In this case, the pulse encoder 90 is configured to: the first pulse signal is generated according to the number of currently executed step angles of the transmission shaft 801. The control assembly 30 is also for: the pulse ratio of the first pulse signal to the second pulse signal is determined as a real-time elevation process parameter of projection screen 20. The second pulse signal is used for representing: the number of steps of execution of the transmission shaft 801 of the drive motor 80 during the switching of the projection screen 20 between the fully extended state and the fully retracted state.
For example, in the case where the model of the pulse encoder 90 is determined, the pulse amount of the pulse signal outputted from the pulse encoder 90 is fixed at the time of one rotation of the transmission shaft 801 of the driving motor 80, and thus, the control assembly 30 can acquire the pulse amount of the first pulse signal and the pulse amount of the second pulse signal.
For example, if the pulse amount of the pulse signal output from the pulse encoder 90 is 360 and the step angle of the driving motor 80 is 7.5 degrees when the transmission shaft 801 of the driving motor 80 rotates one turn, the relationship between the pulse amount m of the pulse signal and the number s of step angles performed by the transmission shaft 801 can be determined as: m=7.5×s. Since the number of steps that the transmission shaft 801 needs to perform during the switching between the fully extended state and the fully retracted state of the projection screen 20 can be determined by the maximum extended width of the projection screen 20, the pulse amount of the second pulse signal can be calculated from the relationship between the pulse amount of the pulse signal and the number of steps performed by the transmission shaft 801.
It should be noted that, through the two alternative implementations, the projection display module 10 may obtain the real-time elevation process parameters of the projection screen 20.
In the present application, after the projection display module 10 acquires the real-time elevation process parameter of the projection screen 20, the projection display module 10 may adjust the image content in the image to be projected currently projected by the projection display module 10 based on the real-time elevation process parameter of the projection screen 20.
By way of example, the projection display module 10 is for: determining a current number of pixel rows of an effective content area in an image to be projected based on a real-time elevation process parameter of the projection screen 20 and a total number of pixel rows in the image to be projected; and adjusts the image content in the image to be projected currently projected by the projection display module 10 based on the current number of pixel rows in the effective content area. In the embodiment of the present application, when determining the current pixel line number of the effective content area in the image to be projected, the projection display module 10 may fill the blank image with the image content having the same line number as the current pixel line number, where the image content is the image content in the effective content area, and fill other areas in the blank image filled with the image content with black images, so as to obtain the image to be projected currently projected by the projection display module 10.
In the present application, the real-time elevation process parameter a of the projection screen 20, the total number D of pixels in the image to be projected currently projected by the projection display module 10, and the current number D of pixels in the effective content area in the image to be projected satisfy: a=d/D. That is, the product of the real-time elevation parameter of the projection screen 20 and the total number of pixel rows in the image to be projected is the current number of pixel rows in the effective content area in the image to be projected.
Optionally, the control assembly 30 is configured to: in the process of driving the projection screen 20 to lift, simultaneously acquiring real-time lifting process parameters of the projection screen 20 and preset lifting process parameters of the projection screen 20; when the real-time elevation parameter of the projection screen 20 is different from the preset elevation parameter of the projection screen 20, the elevation speed of the projection screen 20 is adjusted to adjust the elevation of the projection screen 20. In the present application, the preset lift schedule parameters of the projection screen 20 are used to characterize: the real-time course of projection screen 20 as control assembly 30 drives projection screen 20 up and down at a constant speed. In this way, during the lifting process of the projection screen 20, the control component 30 can drive the projection screen 20 to lift in a uniform driving manner as far as possible through adjusting the lifting process of the projection screen 20 by the control component 30, so that the overlapping degree of the boundary of the effective content area and the boundary of the unfolded projection screen is further improved.
It should be noted that, the manner in which the control component 30 obtains the real-time lifting process parameters of the projection screen 20 may refer to the corresponding parts in the foregoing embodiments, which is not described herein again.
For an implementation in which control assembly 30 obtains preset lift schedule parameters for projection screen 20. Assuming that the control unit 30 drives the projection screen 20 to move up and down at a constant speed, the up-down speed of the projection screen 20 is the ideal up-down speed of the projection screen 20, and the preset process parameters of the projection screen 20 can be obtained based on the ideal up-down speed of the projection screen 20. By way of example, the preset process parameters for the projection screen 20 may be: control assembly 30 may obtain the desired current expanded width of projection screen 20 based on the desired lift velocity of projection screen 20 as a ratio of the desired current expanded width of projection screen 20 to the maximum expanded width of projection screen 20. For example, the desired current deployment width of projection screen 20 is the product of the desired lift speed of projection screen 20 and the duration of the current lift of projection screen 20.
In another alternative implementation, if the control component drives the projection screen 20 at a constant speed, the preset process parameters of the projection screen 20 may also be: the ratio of the length of time currently performed during the raising and lowering of the projection screen 20 to the desired total length of time when the raising and lowering of the projection screen 20 is completed.
The desired total length of time when the projection screen 20 is lifted is determined based on the desired lifting speed of the projection screen 20 and the maximum development width of the projection screen 20. For example, the total length of time that the projection screen 20 is lifted is the ratio of the maximum width of the projection screen 20 to the desired lifting speed of the projection screen 20.
Optionally, referring to fig. 9, fig. 9 is a block diagram of another laser projection system according to an embodiment of the present application. The projection display module 10 in the laser projection system 00 may include: video processing submodule 101, video control submodule 102 and projection submodule 103. The video processing sub-module 101 is connected to the video control sub-module 102 and the projection sub-module 103, respectively. The control assembly 30 may include: a lift control unit 301 and a lift progress detection unit 302. The lifting control unit 301 is connected to the lifting process detection unit 302, and the lifting control unit 301 is connected to the video control sub-module 102, and the lifting process detection unit 302 is connected to the video control sub-module 102.
The elevation control unit 301 is used to drive the projection screen 20 to elevate.
The lift process detection unit 302 is configured to obtain real-time lift process parameters of the projection screen 20, and send the parameters to the video control sub-module 102 and the lift control unit 301.
The video control sub-module 102 is configured to determine the number of pixel rows of the effective content area in the image to be projected, which is required to be projected currently, based on the real-time elevation process parameter of the projection screen 20, and send the number of pixel rows to the video processing sub-module 101. The number of pixel rows of the effective content area in the image to be projected, which is required to be projected at present, is the current number of pixel rows of the effective content area.
The video processing sub-module 101 is configured to process, based on the current number of pixel rows in the active content area, an image to be projected that is currently required to be projected, and send the processed image to the projection sub-module 103.
Projection submodule 103 is used for projecting the image to be projected, which is required to be projected currently, onto the surface where projection screen 20 is located.
The elevation control unit 301 is further configured to simultaneously obtain a real-time elevation process parameter of the projection screen 20 and a preset process parameter of the projection screen 20, and adjust an elevation speed of the projection screen 20 when the real-time elevation process parameter of the projection screen 20 and the preset process parameter of the projection screen 20 are inconsistent.
In summary, the laser projection system provided in the embodiment of the present application includes: projection display module, projection screen, control assembly and pivot. When the laser projection system is not used, the rotating shaft is driven to rotate through the control assembly, so that the projection screen is wound on the rotating shaft, the occupied space of the projection screen is effectively reduced, and the whole occupied space of the laser projection system is further reduced. And the projection display module can adjust the image content in the image to be projected, which is currently projected by the projection display module, based on the real-time lifting process parameter of the projection screen in the process that the control component drives the projection screen to lift, so that the boundary of the effective content area in the image to be projected is overlapped with the boundary of the unfolded projection screen as much as possible, and the display effect of the projection content displayed by the projection screen in the process that the projection screen lifts is improved.
The embodiment of the application also provides a method for controlling the ascending of the projection screen. The projection screen ascent control method is applied to the laser projection system 00 shown in fig. 1, 3, 5, 8, or 9. The laser projection system 00 may include: projection display module 10, projection screen 20, control assembly 30, and spindle 40. Referring to fig. 10, fig. 10 is a flowchart of a method for controlling the rising of a projection screen according to an embodiment of the application. The method for controlling the rising of the projection screen may include:
in step 1001, after the laser projection system receives the start-up instruction, the control component drives the rotating shaft to rotate, so as to drive the projection screen to wind and unwind from the rotating shaft, so that the projection screen ascends, and meanwhile, the real-time lifting process parameters of the projection screen are obtained.
Step 1002, the projection display module adjusts the image content in the image to be projected, which is currently projected to the surface where the projection screen is located, based on the real-time lifting process parameter of the projection screen; wherein the image to be projected includes an effective content area and an ineffective content area.
The embodiment of the application also provides a descent control method of the projection screen. The descent control method of the projection screen is applied to the laser projection system 00 shown in fig. 1, 3, 5, 8, or 9. The laser projection system 00 may include: projection display module 10, projection screen 20, control assembly 30, and spindle 40. Referring to fig. 11, fig. 11 is a flowchart of a method for controlling a projection screen to descend according to an embodiment of the application. The descent control method of the projection screen may include:
step 1101, after the laser projection system receives the shutdown instruction, the control component drives the rotating shaft to rotate so as to drive the projection screen to wind on the rotating shaft, so that the projection screen descends, and meanwhile, the real-time lifting process parameters of the projection screen are obtained.
Step 1102, the projection display module adjusts the image content in the image to be projected, which is currently projected to the surface where the projection screen is located, based on the real-time lifting process parameter of the projection screen; wherein the image to be projected includes an effective content area and an ineffective content area.
Optionally, the projection display module obtains a real-time lifting process parameter of the projection screen, including: and receiving the real-time lifting process parameters of the projection screen sent by the control component. There are various ways for the control component to obtain the real-time lifting process parameters of the projection screen, and the following two alternative implementation manners are taken as examples to schematically illustrate the embodiments of the present application.
In a first alternative implementation, the control component obtains the real-time elevation process parameters of the projection screen including: the control component determines the ratio of the current expansion width of the projection screen to the maximum expansion width of the projection screen as a real-time lifting process parameter of the projection screen.
Optionally, the laser projection system further comprises: the device comprises a box body, a plurality of reference structures and a detector. The pivot is located the box body, and reference structure is located projection screen's edge, and arranges in proper order along projection screen's lifting direction. The detector is used for detecting the number of the reference structures positioned outside the box body;
the control component determines the ratio of the current unfolding width of the projection screen to the maximum unfolding width of the projection screen as a real-time lifting process parameter of the projection screen, and the control component comprises the following steps:
the control assembly determines a current deployment width of the projection screen based on the number of reference structures located outside the cassette detected by the detector.
In the embodiment of the present application, there are various ways in which the detector detects the number of reference structures located outside the case, and the embodiment of the present application will be described below by taking the following two cases as examples.
In a first case, the plurality of reference structures includes: the first reference structures and the second reference structures are arranged at intervals, and the reflectivity of the first reference structures is different from that of the second reference structures. A detector detects the number of reference structures located outside the cassette, comprising: the detector emits detection light to the plurality of reference structures; the detector receives the detection light rays reflected by the plurality of reference structures and generates detection square wave signals based on the received detection light rays; the detector determines the number of the first reference structure and the second reference structure located outside the case based on detecting the square wave signal. The detection square wave signal comprises a first level signal and a second level signal which are distributed at intervals, wherein the first level signal is generated based on detection light reflected by the first reference structure, and the second level signal is generated based on detection light reflected by the second reference structure.
In a second case, the reference structure comprises: a sensor coupled to the detector. The sensor is used for sending a position signal to the detector when the sensor is positioned outside the box body. A detector detects the number of reference structures located outside the cassette, comprising: the detector determines the number of sensors located outside the cassette based on the received position signal.
In a second alternative implementation, the laser projection system further includes: a pulse encoder and a drive motor having a transmission shaft. The control assembly is connected with the pulse encoder and the driving motor, and the transmission shaft of the driving motor is connected with the pulse encoder and the rotating shaft. The control assembly is used for driving the rotating shaft to rotate by controlling the transmission shaft of the driving motor to rotate. The pulse encoder is used for generating a first pulse signal according to the number of the currently executed step angles of the transmission shaft.
The control component obtains the real-time lifting process parameters of the projection screen, which comprises the following steps: the control component determines the pulse quantity ratio of the first pulse signal to the second pulse signal as a real-time lifting process parameter of the projection screen. Wherein the second pulse signal is used to characterize: the number of pitch angles performed by the transmission axis during the switching of the projection screen between the fully extended and fully retracted state.
Optionally, the method may further include: the control component simultaneously acquires real-time lifting process parameters of the projection screen and preset lifting process parameters of the projection screen in the process of driving the projection screen to lift; and when the real-time lifting process parameters of the projection screen are inconsistent with the preset lifting process parameters of the projection screen, adjusting the lifting process of the projection screen.
It should be noted that, the ascending control method of the projection screen and the descending control method of the projection screen provided in the embodiments of the present application may be appropriately adjusted, the steps may also be increased or decreased according to the situation, and any method that is familiar with the technical field of the present application and can easily think of changes is covered in the protection scope of the present application, so that no further description is provided.
It should be further noted that, in the embodiments of the method for controlling the ascent of the projection screen and the embodiments of the method for controlling the descent of the projection screen, the connection relationship of each component in the laser projection system and the working principle of each component may refer to the structural embodiments of the foregoing laser projection system. The embodiments of the present application are not described herein.
In the present disclosure, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but is intended to cover all modifications, equivalents, alternatives, and improvements falling within the spirit and principles of the application.
Claims (8)
1. A laser projection system, comprising: the device comprises a projection display module, a projection screen, a control assembly and a rotating shaft, wherein the control assembly is connected with the projection display module, and the rotating shaft is fixedly connected with one end of the projection screen;
the control assembly is used for: the rotating shaft is driven to rotate so as to drive the projection screen to be wound on the rotating shaft or unfolded from the rotating shaft, so that the projection screen is lifted;
the projection display module is used for: acquiring real-time lifting process parameters of the projection screen in the process that the control assembly drives the projection screen to lift;
based on the real-time lifting process parameters of the projection screen, adjusting the image content in the image to be projected, which is currently projected to the surface of the projection screen by the projection display module; wherein the image to be projected comprises an effective content area and an ineffective content area;
the laser projection system further includes: the projection display module, the control assembly and the rotating shaft are all positioned in the box body, and when the projection screen is in a completely retracted state, the projection screen is positioned in the box body;
the control assembly is used for: in the process of driving the projection screen to lift, simultaneously acquiring real-time lifting process parameters of the projection screen and preset lifting process parameters of the projection screen; the preset lifting process parameters of the projection screen are used for representing: when the control component drives the projection screen at a constant speed, the projection screen is real-time;
and when the real-time lifting process parameters of the projection screen are inconsistent with the preset lifting process parameters of the projection screen, adjusting the lifting process of the projection screen.
2. The laser projection system of claim 1, wherein the projection display module is configured to: determining the current pixel row number of the effective content area based on the real-time lifting process parameter of the projection screen and the total pixel row number in the image to be projected;
and adjusting the image content in the image to be projected, which is currently projected by the projection display module, based on the current pixel row number of the effective content area.
3. The laser projection system as claimed in claim 2, wherein the actual elevation process parameter a of the projection screen, the total number of pixel rows D in the image to be projected, and the current number of pixel rows D of the active content area satisfy: a=d/D.
4. The laser projection system of claim 1, wherein the control assembly is configured to send real-time elevation process parameters of the projection screen to the projection display module;
wherein, the real-time lifting process parameters of the projection screen comprise: a ratio of a current expanded width of the projection screen to a maximum expanded width of the projection screen.
5. The laser projection system of claim 4, wherein the laser projection system further comprises: the device comprises a box body, a plurality of reference structures and a detector, wherein the detector is connected with the control assembly;
the rotating shaft is positioned in the box body, and the reference structure is positioned at the edge of the projection screen and is sequentially distributed along the lifting direction of the projection screen;
the detector is used for: detecting the number of reference structures located outside the cartridge;
the control assembly is used for: the current deployment width of the projection screen is determined based on the number of reference structures located outside the cassette detected by the detector.
6. The laser projection system of claim 1, wherein the laser projection system further comprises: a pulse encoder and a driving motor having a transmission shaft;
the control assembly is connected with the pulse encoder and the driving motor, and a transmission shaft of the driving motor is connected with the pulse encoder and the rotating shaft;
the control assembly is used for: the transmission shaft of the driving motor is controlled to rotate so as to drive the rotating shaft to rotate;
the pulse encoder is used for: generating a first pulse signal according to the number of the currently executed step angles of the transmission shaft;
the control assembly is further configured to: determining the pulse quantity ratio of the first pulse signal to the second pulse signal as a real-time lifting process parameter of the projection screen; wherein the second pulse signal is used to characterize: the number of steps that the transmission shaft performs during the switching of the projection screen between the fully extended and fully retracted state.
7. A method for controlling the elevation of a projection screen, applied to the laser projection system of any one of claims 1 to 6, comprising: the device comprises a projection display module, a projection screen, a control assembly and a rotating shaft, wherein the control assembly is connected with the projection display module, and the rotating shaft is fixedly connected with one end of the projection screen; the method comprises the following steps:
after the laser projection system receives a starting-up instruction, the control assembly drives the rotating shaft to rotate so as to drive the projection screen to wind and unwind from the rotating shaft, so that the projection screen ascends, and meanwhile, the real-time lifting process parameters of the projection screen are obtained;
the projection display module adjusts the image content in the image to be projected, which is currently projected to the surface where the projection screen is positioned, based on the real-time lifting process parameters of the projection screen; wherein the image to be projected includes the effective content area and the ineffective content area.
8. A method for controlling the lowering of a projection screen, applied to the laser projection system according to any one of claims 1 to 6, comprising: the device comprises a projection display module, a projection screen, a control assembly and a rotating shaft, wherein the control assembly is connected with the projection display module, and the rotating shaft is fixedly connected with one end of the projection screen; the method comprises the following steps:
after the laser projection system receives a shutdown instruction, the control component drives the rotating shaft to rotate so as to drive the projection screen to wind on the rotating shaft, so that the projection screen descends, and meanwhile, the real-time lifting process parameters of the projection screen are obtained;
the projection display module adjusts the image content in the image to be projected, which is currently projected to the surface where the projection screen is positioned, based on the real-time lifting process parameters of the projection screen; wherein the image to be projected includes the effective content area and the ineffective content area.
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| CN202010115275.5A CN113382216B (en) | 2020-02-25 | 2020-02-25 | Laser projection system and method for controlling ascending and descending of projection screen |
| PCT/CN2021/075977 WO2021169789A1 (en) | 2020-02-25 | 2021-02-08 | Projection system, and startup operation method and shutdown operation method for same |
| US17/491,460 US11856338B2 (en) | 2020-02-25 | 2021-09-30 | Projection apparatus and control method thereof |
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| CN202010115275.5A CN113382216B (en) | 2020-02-25 | 2020-02-25 | Laser projection system and method for controlling ascending and descending of projection screen |
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| JP2012257071A (en) * | 2011-06-09 | 2012-12-27 | Seiko Epson Corp | Projector, projection system, projector control method, and program |
| CN208781415U (en) * | 2017-11-24 | 2019-04-23 | 苏州新雅电子有限公司 | A kind of multimedia education system |
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| US20150029229A1 (en) * | 2013-07-27 | 2015-01-29 | Sharp Laboratories Of America, Inc. | Adjustable Size Scrollable Display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012257071A (en) * | 2011-06-09 | 2012-12-27 | Seiko Epson Corp | Projector, projection system, projector control method, and program |
| CN208781415U (en) * | 2017-11-24 | 2019-04-23 | 苏州新雅电子有限公司 | A kind of multimedia education system |
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