CN106993174A - A kind of projector equipment electromotive focusing method and device - Google Patents
A kind of projector equipment electromotive focusing method and device Download PDFInfo
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- CN106993174A CN106993174A CN201710375535.0A CN201710375535A CN106993174A CN 106993174 A CN106993174 A CN 106993174A CN 201710375535 A CN201710375535 A CN 201710375535A CN 106993174 A CN106993174 A CN 106993174A
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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
- H04N9/317—Convergence or focusing systems
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Abstract
Embodiments herein provides a kind of projector equipment electromotive focusing method and device, is related to projection art, can not be while the problem of accomplishing optimal in the focusing time and focusing precision occurred during electromotive focusing to solve existing projector equipment.This method includes：The triggering frequency of detection of projection devices acquired focusing instruction within a predetermined period of time, the focusing is instructed for indicating that the stepper motor of projector equipment is focused to predetermined rotation rotation, determine the target single revolution angle that stepper motor matches with the triggering frequency, Driving Stepping Motor is rotated according to target single revolution angle to predetermined rotation, to drive lens group to be moved in ray machine and realize electromotive focusing.
Description
Technical field
The application is related to projection art, more particularly to a kind of projector equipment electromotive focusing method and device.
Background technology
Projector equipment is after powering, it usually needs user adjusts projection and set manually according to the distance of projector equipment to screen
Standby focusing ring, to adjust positional distance of the lens group in ray machine, determines the position of project focus spot, reaches projected picture
To optimal definition, this process is referred to as " projected focus ".At present, conventional projector equipment is when realizing electromotive focusing,
Drive lens group to be moved in ray machine typically by a micromachine inside projector equipment, set with adjusting projection
Standby focal length, and then adjust the definition of projected picture.
In general, all it is to be rotated according to a predetermined angle when motor is rotated every time so that lens group is by fixation
Distance value is moved in ray machine, wherein, predetermined angle is N times of the minimum rotation angle of motor, user in remote control or
Focusing button on projector equipment is by once, and motor will be rotated once according to this preset angle.But the adjustment mode can be to use
Family is made troubles in focusing, in focus operation early stage, and picture is more obscured, and user is focused by multi-pass operation after button, is drawn
The still not up to clear display in face, focus operation takes, if shortening focusing time, it is possible to increase N, pre- with increase that motor rotates every time
If angle, each displacement of such ray machine just can be than larger, so as to reach the purpose of rapid focus.But, if ray machine this
When apart from pinpointed focus it is nearer when, then ray machine displacement can be caused excessive, and skip ray machine pinpointed focus.
Therefore, using existing electromotion focusing scheme, it is impossible to while by the focusing time during electromotive focusing and focusing
Precision is adjusted to optimal.
The content of the invention
Embodiments herein provides a kind of projector equipment electromotive focusing method and device, to solve existing projector equipment
Can not be while the problem of accomplishing optimal in the focusing time and focusing precision occurred during electromotive focusing.
To reach above-mentioned purpose, embodiments herein is adopted the following technical scheme that：
First aspect there is provided a kind of projector equipment electromotive focusing method, including：
The triggering frequency of detection of projection devices acquired focusing instruction within a predetermined period of time, the focusing, which is instructed, to be used for
Indicate that the stepper motor of the projector equipment is rotated to predetermined rotation；
Determine the target single revolution angle that the stepper motor matches with the receives frequency；
The stepper motor is driven to be rotated according to the target single revolution angle to the predetermined rotation, to drive
Lens group moves in the ray machine and realizes electromotive focusing.
Second aspect there is provided a kind of projector equipment electromotive focusing device, including：
Detection module, for the triggering frequency of detection of projection devices acquired focusing instruction within a predetermined period of time, institute
Stating focusing instruction is used to indicate that the stepper motor of the projector equipment is rotated to predetermined rotation；
Determining module, for determining the mesh that the triggering frequency that the stepper motor and the detection module are detected matches
Mark single revolution angle；
Control module, the target single revolution angle determined for driving the stepper motor according to the determining module to
The predetermined rotation is rotated, to drive lens group to be moved in the ray machine and realize electromotive focusing.
By the definition for the picture that user can be seen according to its human eye, to adjust keying frequency, and user's is each
Button can trigger once focusing instruction, therefore the application passes through detection of projection devices acquired focusing within a predetermined period of time
The triggering frequency of instruction, to speculate user behavior, determines the optimal angle rotated needed for current stepper motor, so as to root
Currently focused according to user the operating frequency of button, the speed of debugging focusing in real time often walk the angle turned over to stepper motor in real time
Degree is adjusted, so that user can find pinpointed focus in the most short time, is improved and is watched experience.For example, when tactile
When hair frequency is higher, then show that the definition for the image that human eye is seen is lower, the lens group in ray machine is apart from pinpointed focus
Position by the single revolution angle of stepper motor farther out, it is necessary to set higher value, so that stepper motor can drive ray machine
Pinpointed focus quickly is moved to, or, when triggering frequency is lower, then show that the definition for the image that human eye is seen is higher, light
Lens group in machine in other words, reduces close to pinpointed focus, it is necessary to the single revolution angle of stepper motor is set into smaller value
The single revolution angle of stepper motor, allows user to carry out fine tuning, and picture most clearly position is found in assistance.
Brief description of the drawings
, below will be in embodiment or description of the prior art in order to illustrate more clearly of the technical scheme of the embodiment of the present application
The required accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some realities of the application
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
The connection diagram of each module inside a kind of projector equipment that Fig. 1 provides for the embodiment of the present application；
A kind of schematic flow sheet for projector equipment electromotive focusing method that Fig. 2 provides for the embodiment of the present application；
The ray machine displacement schematic diagram that Fig. 3 provides for the embodiment of the present application；
A kind of structural representation for projector equipment electromotive focusing device that Fig. 4 provides for the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
Fig. 1 is existing projector equipment internal module connection diagram, and reference picture 1 understands that existing projector equipment is at least wrapped
Include：Main process task chip, stepper motor driver, stepper motor, ray machine and the lens group being arranged in ray machine, wherein, projection
The main process task chip of equipment is used to send driving instruction to stepper motor driver, to indicate stepper motor driver driving and its
The stepper motor of connection is rotated according to predetermined rotation, and motor rotation driving lens group is moved in ray machine, to adjust
Positional distance of the lens group in ray machine, realizes focusing.It should be noted that the camera lens that projector equipment is used in the application for
Tight shot, that is to say, that the entirety of mobile lens group, could complete the adjustment of focusing.
The executive agent for the projector equipment electromotive focusing method that the embodiment of the present application is provided can be electronic right for projector equipment
Coke installation, or for performing the projector equipment of above-mentioned projector equipment electromotive focusing method.Wherein, projector equipment electromotive focusing is filled
Put to be (the English of the central processing unit in the main process task chip of above-mentioned projector equipment：Central Processing Unit,
Referred to as：CPU) or can be above-mentioned projector equipment in control unit or functional module.
The general principle for the technical scheme that the embodiment of the present application is provided is：By detecting user within a predetermined period of time
The triggering frequency for the focusing instruction that button in operation remote keying or projector equipment is triggered in projector equipment, to stepping electricity
The angle that machine often walks rotation is adjusted in real time, e.g., when triggering frequency is higher, then shows the clear of the image that human eye is seen
Degree is lower, and farther out, the step angle of the single revolution of stepper motor is set apart from the position of pinpointed focus for the lens group in ray machine
Larger data is put, the purpose quickly moved is reached, when triggering frequency is lower, then shows that the definition for the image that human eye is seen is got over
Lens group in height, ray machine reduces the step angle of the single revolution of stepper motor, carries out user close to pinpointed focus
Picture most clearly position is found in fine tuning, assistance.
It should be noted that in the embodiment of the present application, word " exemplary " or " such as " makees example, example for expression
Card or explanation.Any embodiment or design for being described as " exemplary " or " such as " in the embodiment of the present application should not
It is interpreted than other embodiments or design more preferably or more advantage.Specifically, " exemplary " or " example are used
Such as " word is intended to that related notion is presented in a concrete fashion.In the embodiment of the present application, " (English：Of) ", " corresponding (English：
Corresponding, relevant) " and " corresponding (English：Corresponding) " it can use with sometimes, it should be pointed out that
Be, when not emphasizing its difference, its is to be expressed be meant that it is consistent.
Embodiments herein provides a kind of projector equipment electromotive focusing method, as shown in Fig. 2 this method includes following step
Suddenly：
101st, the triggering frequency of detection of projection devices acquired focusing instruction within a predetermined period of time.
Above-mentioned focusing instruction is used to indicate that the stepper motor of projector equipment is focused to predetermined rotation rotation,
General, the rotation direction of stepper motor would generally be included in focusing instruction, to indicate stepper motor according to predetermined rotating method
Rotate, carry out drive lens group and moved in ray machine.When implementing, above-mentioned focusing instruction can be user to projector equipment
The focusing button of remote control equipment or the focusing button of projector equipment trigger when performing button operation (e.g., single-click operation).
Under normal circumstances, two focusing buttons, a control stepper motor up time are included on projector equipment or remote control equipment
Pin direction is rotated, and a control stepper motor is rotated in an anti-clockwise direction.
Exemplary, the definition for the image seen when user's human eye is higher, saturating in ray machine when picture understands substantially
Microscope group is close to pinpointed focus, in order to avoid missing optimal focus position, user typically will not continuous key-press, now, user is each
Press focusing button after button interval it is longer (e.g., 1s), user key-press frequency can be reduced, with wish by picture adjust it is optimal
State, accordingly, the triggering frequency instructed of focusing that the button operation of user is triggered can also be reduced；When user's human eye is seen
Image definition it is more relatively low, when picture is obscured very much, lens group in ray machine apart from the distant of pinpointed focus, in order to
Shorten focusing time, user understands quick key or lasting button, or even long-press focusing button (i.e. button is at intervals of 0) always, used
Family keying frequency can increase, to reach the purpose of quick rotation motor, accordingly, and the focusing that the button operation of user is triggered refers to
The triggering frequency of order can increase.
102nd, the target single revolution angle that stepper motor currently matches with triggering frequency is determined.
Exemplary, the triggering frequency that the focusing acquired in detecting in projector equipment predetermined amount of time is instructed is higher,
The distance for then needing ray machine to move is bigger, i.e., stepper motor single revolution angle is bigger；Conversely, making a reservation for when detecting projector equipment
The triggering frequency of acquired focusing instruction is lower in period, then the distance for needing ray machine to move is smaller, i.e. stepper motor list
Secondary rotational angle is smaller.
103rd, Driving Stepping Motor is rotated according to target single revolution angle to predetermined rotation, to drive lens group to exist
Moved in ray machine and realize electromotive focusing.
In the specific implementation, stepper motor in projector equipment is connected with the lens group being arranged in ray machine by mechanical structure
Connect, therefore, when stepper motor is rotated according to target single revolution angle to predetermined rotation, can drive connected
Microscope group is moved forward or rearward in ray machine, to adjust the focal length of projector equipment.
When implementing, if after execution of step 103, user solely sees screen, find not completing focusing also, then may proceed to
Step 101-103 is performed, to control ray machine to move, to complete focusing.
In a kind of example, above-mentioned step 102 specifically includes following steps：
102a, the triggering frequency instructed according to focusing size, directly from the motor single revolution angle table prestored, are looked into
The single revolution angle that the triggering frequency instructed with the focusing matches is found, wherein, wrapped in the motor single revolution angle table
The corresponding motor single revolution angle of triggering frequency instructed containing different focus.
In another example, above-mentioned step 102 specifically includes following steps：
102b1, from angle iteration threshold table, find out with the angle on target iteration threshold that matches of triggering frequency, its
In, the corresponding angle iteration threshold of triggering frequency instructed in angle iteration threshold table comprising different focus.
102b2, the predetermined single rotational angle of stepper motor is multiplied with angle on target iteration threshold, calculates stepping electricity
The current target single revolution angle of machine.
Exemplary, if the application sets user to remote control or projection according to the size of the triggering frequency of focusing instruction
Button on standby keypad is divided into 4 stages and detected：Continuous key-press, button interval are less than 0.1S, button interval and are more than
0.1s is less than 0.5s, button interval, and more than 0.5s, (number of fragments and key response time can increase or delete according to real needs
Subtract).Then corresponding angle iteration threshold table is as shown in table 1 below, it is necessary to which explanation, table 1 below is only the angle under above-mentioned scene
A kind of example of iteration threshold table, can in the light of actual conditions be configured during practical application.Exemplary, described in table 1 below
The angle iteration thresholds of the corresponding stepper motors in four kinds of button intervals, that is, set the single revolution angle, θ of 4 kinds of stepper motorsA、
θB、θC、θDThe 4 kinds of situations come in corresponding table 1.Wherein, the calculation formula of the single revolution angle of stepper motor is as follows：
θx=Nx* K (formula 1)
Wherein, above-mentioned θxSingle revolution angle for representing the stepper motor under xth kind application scenarios；Above-mentioned K
For the minimum rotation angle of stepper motor, general, one beat of motor rotates minimum angle K=360 degree/speed reducing ratio/phase
Turns Per Knot is clapped；Above-mentioned NxFor representing corresponding minimum rotation angular multiples under xth kind application scenarios.
Exemplary, the interval time of the continuous key-press detected under each scene is smaller, and N is bigger, the list of stepper motor
Secondary rotational angle θ is bigger, conversely, interval time is bigger, N is smaller, and the single revolution angle, θ of stepper motor is smaller.Need explanation
, N concrete numerical value needs to be set according to actual conditions, relevant with the fit system of lens group in stepper motor and ray machine,
Because general stepper motor can be coordinated with the lens group in ray machine by gear, the deceleration device of different gear setting subtracts
Speed is than different.
Projector equipment continuous key-press, i.e. scenario A are detected for example, working as：When keying frequency is more than predetermined threshold, then θA=
20*θ。
Table 1
Referring to Fig. 3, maximum removable displacement is D, the position of lens group currently in ray machine in the ray machine of certain projector
It is assumed to be optimal focus position for position A, position B.It can be seen that, position A is distant apart from pinpointed focus, and picture can very mould
Paste, now, user may continuous key-press, system judges the current button operation of user by detecting the keying frequency of user
After continuous key-press, corresponding N value can be found, while sending commands to stepper motor driver carrys out motor according to table 1
Rotate.When the lens group in ray machine is moved to D2 position, distance focal point is nearer, and picture is substantially clear, now, user
Button will not be typically carried out continuously, to prevent skipping optimum position, now the time of button is general within 0.1S, i.e. keying frequency
It can reduce, then the table of comparisons 1 carries out searching corresponding N, sends commands to stepper motor driver and carrys out motor rotation.Work as ray machine
When interior lens group is moved to D3 position, picture understands, what user can be slowly is finely adjusted to lens group, finds what is watched
Best Point, the distance that now lens group is moved every time is very small.So in fuzzy pictures, it is possible to be quickly adjusted to picture
Near face is more visible, again can with less displacement, by picture adjust it is most clear.
In addition, when detect projector equipment ray machine movement to terminal, and projector equipment do not complete focusing when, then need throw
The stepper motor opposite direction of shadow equipment is rotated, and continues to focus, you can to trigger alarm, carrys out the regulation of instruction user opposite direction burnt
Away from, or, directly control the stepper motor of projector equipment to be rotated to the opposite direction in current operation direction.
The scheme that the application is provided, passes through the triggering of detection of projection devices acquired focusing instruction within a predetermined period of time
Frequency, according to the frequency got, determines the optimal angle rotated needed for current stepper motor, so as to work as according to user
The operating frequency of preceding focusing button, the speed of debugging focusing in real time often walk the angle turned over to stepper motor in real time and adjust
It is whole, so that user can find pinpointed focus in the most short time, improve and watch experience.
Illustrate the device embodiment corresponding with embodiment of the method presented above that the embodiment of the present application is provided below.
It should be noted that in following apparatus embodiment related content explanation, may be referred to above method embodiment.
Fig. 4 shows a kind of possible structural representation of projector equipment electromotive focusing device involved in above-described embodiment
Figure, reference picture 4, the device include：Detection module 21, determining module 22 and control module 23, wherein：
Detection module 21, for the triggering frequency of detection of projection devices acquired focusing instruction within a predetermined period of time,
The focusing is instructed for indicating that the stepper motor of projector equipment is rotated to predetermined rotation.
Determining module 22, for determining the target list that the triggering frequency that stepper motor and detection module 21 are detected matches
Secondary rotational angle.
Control module 223, the target single revolution angle determined for Driving Stepping Motor according to determining module 22 is to pre-
Rotation direction rotation is determined, to drive lens group to be moved in ray machine and realize electromotive focusing.
Optionally, determining module 22 specifically for：
From angle iteration threshold table, the angle on target that the triggering frequency detected with detection module 21 matches is found out
Iteration threshold；Wherein, the corresponding angle iteration threshold of triggering frequency instructed in the angle iteration threshold table comprising different focus；
The predetermined single rotational angle of stepper motor is multiplied with angle on target iteration threshold, stepper motor is calculated current
Target single revolution angle.
Optionally, control module 23, are additionally operable to：
When detect projector equipment ray machine move to terminal when, triggering alarm or control projector equipment stepper motor to
The opposite direction in current operation direction is rotated；Wherein, above-mentioned alarm is focused for instruction user opposite direction.
It should be noted that during implementing, performed each step in above-mentioned method flow as shown in Figure 2
It can be realized by the computer executed instructions of the software form stored in the computing device memory of example, in hardware, to keep away
Exempt to repeat, here is omitted.And the program corresponding to the action performed by said apparatus can be stored in a software form
In the memory of the device, in order to which processor calls the corresponding operation of execution above modules.Memory above can
With including volatile memory (volatile memory), for example random access memory (random-access memory,
RAM)；Nonvolatile memory (non-volatile memory), such as read-only storage (read-only can also be included
Memory, ROM), flash memory (flash memory), hard disk (hard disk drive, HDD) or solid state hard disc
(solid-state drive, SSD)；The combination of the memory of mentioned kind can also be included.
Processor in device presented above can be the system of a processor or multiple treatment elements
Claim.For example, processor can be central processing unit (central processing unit, CPU；Can also be other general places
Manage device, digital signal processor (digital signal processing, DSP), application specific integrated circuit (application
Specific integrated circuit, ASIC), field programmable gate array (field-programmable gate
Array, FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components etc..It is logical
It can be microprocessor with processor or the processor can also be any conventional processor etc.；Can also be dedicated processes
Device, the application specific processor can include at least one in baseband processing chip, radio frequency processing chip etc..
It is apparent to those skilled in the art that, for convenience and simplicity of description, the device of foregoing description
With the specific work process of module, the corresponding process in preceding method embodiment is may be referred to, be will not be repeated here.
, can be by it in several embodiments provided herein, it should be understood that disclosed apparatus and method
Its mode is realized.For example, device embodiment described above is only schematical, for example, the division of the module, only
Only a kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple module or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed
Coupling each other or direct-coupling or communication connection can be the INDIRECT COUPLINGs or logical of device or unit by some interfaces
Letter connection, can be electrical, machinery or other forms.
The module illustrated as separating component can be or may not be it is physically separate, it is aobvious as module
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in the application each embodiment can be integrated in a processing unit, can also
That the independent physics of unit includes, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit to realize.
Finally it should be noted that：Above example is only to the technical scheme for illustrating the application, rather than its limitations；Although
The application is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from each embodiment technical scheme of the application spirit and
Scope.
Claims (6)
1. a kind of projector equipment electromotive focusing method, it is characterised in that including：
The triggering frequency of detection of projection devices acquired focusing instruction within a predetermined period of time, the focusing is instructed for indicating
The stepper motor of the projector equipment is rotated to predetermined rotation；
Determine the target single revolution angle that the stepper motor matches with the triggering frequency；
The stepper motor is driven to be rotated according to the target single revolution angle to the predetermined rotation, to drive lens
Group moves in the ray machine and realizes electromotive focusing.
2. according to the method described in claim 1, it is characterised in that described to determine the stepper motor and the triggering frequency phase
The target single revolution angle of matching, including：
From angle iteration threshold table, the angle on target iteration threshold matched with the triggering frequency is found out；Wherein, it is described
The corresponding angle iteration threshold of triggering frequency instructed in angle iteration threshold table comprising different focus；
The predetermined single rotational angle of the stepper motor is multiplied with the angle on target iteration threshold, the stepping is calculated
The current target single revolution angle of motor.
3. method according to claim 1 or 2, it is characterised in that methods described also includes：
When the ray machine for detecting the projector equipment is moved to terminal, triggering alarm or the stepper motor is controlled to working as forward
The opposite direction in dynamic direction is rotated；Wherein, described alert focuses for instruction user opposite direction.
4. a kind of projector equipment electromotive focusing device, it is characterised in that including：
Detection module, it is described right for the triggering frequency of detection of projection devices acquired focusing instruction within a predetermined period of time
Jiao is instructed for indicating that the stepper motor of the projector equipment is rotated to predetermined rotation；
Determining module, for determining the target list that the triggering frequency that the stepper motor and the detection module are detected matches
Secondary rotational angle；
Control module, the target single revolution angle determined for driving the stepper motor according to the determining module is to described
Predetermined rotation is rotated, to drive lens group to be moved in the ray machine and realize electromotive focusing.
5. device according to claim 4, it is characterised in that the determining module specifically for：
From angle iteration threshold table, find out the angle on target that the triggering frequency detected with the detection module matches and change
For threshold value；Wherein, the corresponding angle iteration threshold of triggering frequency instructed in the angle iteration threshold table comprising different focus；
The predetermined single rotational angle of the stepper motor is multiplied with the angle on target iteration threshold, the stepping is calculated
The current target single revolution angle of motor.
6. the device according to claim 4 or 5, it is characterised in that：
The control module, is additionally operable to when the ray machine for detecting the projector equipment is moved to terminal, triggering alarm or control
The stepper motor of the projector equipment is rotated to the opposite direction in current operation direction；Wherein, it is described alert it is anti-for instruction user
Direction is focused.
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Cited By (7)
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| CN107277477A (en) * | 2017-08-16 | 2017-10-20 | 成都市极米科技有限公司 | Gap compensation method, blank compensation apparatus and projector equipment |
| CN109714519A (en) * | 2017-10-25 | 2019-05-03 | 成都市极米科技有限公司 | A kind of method and system of adjust automatically image frame |
| CN110930518A (en) * | 2019-08-29 | 2020-03-27 | 广景视睿科技（深圳）有限公司 | Projection method and projection equipment based on augmented reality technology |
| CN111405259A (en) * | 2020-05-20 | 2020-07-10 | 成都极米科技股份有限公司 | Focusing method, focusing device, remote controller and readable storage medium of projection equipment |
| CN111464091A (en) * | 2020-04-08 | 2020-07-28 | 成都极米科技股份有限公司 | Control method and control device of shift motor and projection system |
| CN112009371A (en) * | 2020-09-08 | 2020-12-01 | 恒大新能源汽车投资控股集团有限公司 | Full-view dynamic display method for interior rearview mirror, storage medium and electronic equipment |
| WO2021088236A1 (en) * | 2019-11-05 | 2021-05-14 | 广景视睿科技（深圳）有限公司 | Focusing assembly control method and apparatus, focusing assembly, and projector |
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