CN114675430A - Screen vibration system and control method thereof - Google Patents
Screen vibration system and control method thereof Download PDFInfo
- Publication number
- CN114675430A CN114675430A CN202210372071.9A CN202210372071A CN114675430A CN 114675430 A CN114675430 A CN 114675430A CN 202210372071 A CN202210372071 A CN 202210372071A CN 114675430 A CN114675430 A CN 114675430A
- Authority
- CN
- China
- Prior art keywords
- screen
- vibration
- data
- vibration data
- driver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001133 acceleration Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000000246 remedial effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
-
- 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
Abstract
The invention is suitable for the technical field of laser projection display, and provides a screen vibration system and a control method thereof, wherein the screen vibration system comprises a vibrator for driving a screen to vibrate and a driver for driving the vibrator; the control method comprises the following steps: receiving vibration data for reflecting the amplitude of the screen; and controlling the driving parameters of the driver according to the vibration data so that the vibration data are maintained within a preset reference range. In the invention, when the screen speckles are eliminated in a screen vibration mode, the screen vibration amplitude is maintained in a preset reference range by detecting the vibration data for reflecting the screen amplitude in real time and controlling the driving parameters of the driver according to the vibration data, so that the screen speckles can be effectively eliminated during projection, and the automatic adjustment of the screen amplitude is realized.
Description
Technical Field
The invention belongs to the technical field of laser projection display, and particularly relates to a screen vibration system and a control method thereof.
Background
Projection display using laser as light source usually faces the speckle problem of screen picture, and it is a common practice in laser projection display industry to eliminate speckle by vibrating screen.
The vibration is generally generated by a vibration motor, and there is also a method of generating vibration of a screen by using a low frequency speaker. Most vibrators are installed behind the screen, and the vibration state of the vibrator itself, the actual vibration state of the screen or the speckle problem is not measured or monitored and is in an open-loop state, so that the speckle eliminating effect cannot be guaranteed.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is how to ensure the speckle elimination effect when eliminating the speckles of the screen picture in a screen vibration mode.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a method for controlling a screen vibration system, where the screen vibration system includes a vibrator for driving a screen to vibrate, and a driver for driving the vibrator; the control method comprises the following steps:
receiving vibration data for reflecting the amplitude of the screen;
and controlling the driving parameters of the driver according to the vibration data so that the vibration data are maintained within a preset reference range.
In a second aspect, an embodiment of the present invention further provides a screen vibrating system, including:
the vibrator is used for driving the screen to vibrate;
a driver for driving the vibrator;
the vibration sensor is used for detecting vibration data capable of reflecting the amplitude of the screen;
and the controller is used for receiving vibration data for reflecting the amplitude of the screen and controlling the driving parameters of the driver according to the vibration data so that the vibration data are maintained in a preset reference range.
In the embodiment of the invention, when the screen speckles are eliminated in a screen vibration mode, the vibration data used for reflecting the screen amplitude is detected in real time, and the driving parameters of the driver are controlled according to the vibration data, so that the screen vibration amplitude is maintained in a preset reference range, the screen speckles can be effectively eliminated during projection, and the automatic adjustment of the screen amplitude is realized.
Drawings
Fig. 1 is a flowchart of a control method of a screen vibration system according to a first embodiment of the present invention;
fig. 2 is a flowchart of a control method of a screen vibration system according to a second embodiment of the present invention;
fig. 3 is a structural view of a screen vibrating system according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the invention, when the screen speckles are eliminated in a screen vibration mode, the vibration data used for reflecting the screen amplitude is detected in real time, and then the driving parameters of the driver are controlled according to the vibration data, so that the vibration data can be adjusted in real time, and the screen speckles are effectively eliminated.
Based on the above principle, the first embodiment of the present invention provides a control method for a screen vibration system, the flow of which is shown in fig. 1 and detailed as follows:
in step S101, vibration data reflecting the amplitude of the screen is received.
In this embodiment, the screen vibrating system includes a vibrator for driving the screen to vibrate and a driver for driving the vibrator.
The quantity of vibrator is not limited, can be according to the nimble setting of the material characteristic of screen size, screen itself, and the vibrator can be through the direct attached or indirect attached back at the screen of glue film, and wherein, "indirect attached" indicates the vibrator not with screen direct contact, for example can be on the concatenation seam at the screen back earlier with the attached one deck concatenation back of the body strip of glue film, with attached on this concatenation back of the body strip of vibrator again. Whereas the "back" is the side facing away from the audience during use, the side facing the audience may be referred to as the front side of the screen, which is used to reflect the reflected projected light to the auditorium.
The driver is electrically connected with the vibrator and used for outputting a driving signal to the vibrator to drive the vibrator, and when the vibrator is driven, the screen can be driven to vibrate together. The driver and the vibrator may be in a one-to-one correspondence relationship, or one driver may simultaneously correspond to a plurality of vibrators, which is not limited in particular. The driving signal may be a direct current driving signal or an alternating current driving signal, and driving parameters such as frequency and voltage of the driving signal may be adjusted by an instruction.
The vibrator generally consists of an exciting coil, a magnet, a spring and related mounting fittings, and the "overall natural frequency" of the vibrator refers to the frequency at which the entire vibrator (including the exciting coil, the magnet, the spring and the related mounting fittings) can resonate with a vibration source when excited to vibrate by the outside. In the present embodiment, the overall natural frequency f of the vibrator0Controlled between 5-200 Hz, preferably f0The frequency is 10-60 Hz, which is beneficial to weakening the noise which can be identified by human ears and is generated by the vibration of the screen. The driving frequency of the driving signal output by the driver is changed within the preset change amplitude of the integral natural frequency of the corresponding vibrator. Specifically, the drive frequency of the drive signal output by the driver is foutTo avoid the vibrator from being damaged due to the generation of violent resonance, foutIs not equal to f0And f is0-20Hz≤fout≤f0+20Hz, for example, can be designed as the drive frequency foutIs 50Hz and the overall natural frequency f0Between 55-60Hz, so that a powerful vibration effect can be obtained without damaging the vibrator.
In general, the driving frequency f of the driving signal output by the driveroutThis operating logic may be employed to determine:
the first step is as follows: electrifying the screen vibration system, starting the controller and giving an instruction to the driver, outputting a driving signal after the driver obtains the instruction, and controlling the frequency of the driving signal to be f0Carrying out frequency scanning from low to high (or from high to low) at +/-5 Hz according to a certain step length (such as 0.1Hz), and simultaneously, starting to synchronously acquire vibration data of the vibrator through a sensor and recording the corresponding relation between the vibration state and the driving frequency;
the second step: after the scanning is finished, selecting the driving frequency with the maximum corresponding amplitude and transmitting the driving frequency to the driver as the determined driving frequency foutSo that the driver is driven at the driving frequency foutThe vibrator is driven.
The "vibration data reflecting the screen amplitude" may be the vibration amplitude data of the screen as it is, or may be vibration data obtained from the vibrator itself. In the former case, the screen vibration amplitude is influenced by a plurality of factors, such as the elastic coefficient of the screen material, whether the screen is tightened, the distribution of the vibrators, the number of the vibrators, and the like, and different amplitudes appear at different positions on the screen under the influence of the standing wave, so that the amplitude data of the screen is related to the positions of the vibrators. In the latter case, although the vibration data is obtained from the vibrator itself, the vibration state of the screen can be reflected since the vibrator can drive the screen to vibrate together.
Specifically, the vibration data may include one or more of displacement data, acceleration data, and velocity data of the actuator itself; or one or more of displacement data, acceleration data and speed data of the screen driven to vibrate.
In step S102, driving parameters of the driver are controlled according to the vibration data, so that the vibration data is maintained within a preset reference range.
According to the resonance principle, when the external damping is fixed and the driving voltage is fixed, the driving frequency is equal to the natural frequency of the vibrator, and the vibrator reaches the maximum vibration amplitude; the more the driving frequency deviates from the natural frequency of the vibrator, the smaller the vibration amplitude. When the driving frequency and the driving voltage are fixed, the larger the external damping is, the smaller the vibration amplitude of the vibrator is. When the vibration frequency and the external damping are fixed, the higher the driving voltage is, the larger the vibration amplitude of the vibrator is. Therefore, the vibration amplitude of the vibrator can be adjusted by changing the output frequency and the output voltage of the driver of the vibrator.
Specifically, when the vibration data is detected to be larger than the upper limit of the preset reference range, adjusting the driving parameters of the driver until the vibration data is reduced to the preset reference range; and when the vibration data is detected to be smaller than the lower limit of the preset reference range, adjusting the driving parameters of the driver until the vibration data rises to the preset reference range.
The driving parameters comprise output frequency and output voltage, and the output voltage can be realized by changing the duty ratio of the driving signal. When the driving parameters are adjusted, a certain adjustment step length can be preset, and the step length is taken as the amplitude for adjustment every time. As described above, when the output frequency is adjusted, adjustment toward a direction close to the overall natural frequency of the vibrator means that the vibration data will rise, and adjustment toward a direction away from the overall natural frequency of the vibrator means that the vibration data will fall. In addition, only the output frequency may be specifically adjusted, only the output voltage may be adjusted, or the output frequency may be adjusted first, and when the vibration data cannot be adjusted to the target value, the output voltage is attempted to be adjusted, and vice versa.
The upper limit of the above reference range is required to be lower than the maximum vibration amplitude that the vibrator can withstand in order to protect the vibrator from damage due to excessive vibration.
Further, to reduce the ineffective operation time of the vibrator, communication with the projector may also be established. The control method further includes:
step S103, receiving an instruction of a projector, wherein the instruction carries working state information of the projector;
and step S104, controlling the opening and closing of the driver according to the instruction.
For example, the driver may be controlled to be off when the projector has not started projection or the projection ends, and to be on when the projector is projecting normally.
In addition, communication with a background can be established, the working state of the vibrator is uploaded to the background, background personnel can know the working state conveniently, and remedial measures can be taken in time when a fault occurs.
Based on the first embodiment, a flow of a control method of a screen vibrating system according to a second embodiment of the present invention is shown in fig. 2, where in the second embodiment, step S102 includes:
and step S1021, when the image projected on the screen can cause the appearance of the speckles, adjusting the driving parameters of the driver corresponding to the position where the speckles appear to eliminate the speckles.
In the second embodiment, the number of the vibrators is a plurality, and each vibrator is used for driving the corresponding position on the screen to vibrate, so that when speckles appear at a certain position, the driving parameters of the driver corresponding to the position can be adjusted only, the adjusting mode is more targeted and simpler, and the workload of the system can be reduced.
The appearance of the speckle of the screen is related to the brightness of a specific projection picture besides the characteristics of the screen material, for example, the speckle appears in the area a of the screen due to the brightness distribution of some picture frames of a certain film, so that the film can be tried out before formal projection, the area where the speckle appears on the screen is recorded in the trying out process, the position where the speckle appears on the screen can be known in advance, and even the moment when the speckle appears can be recorded. When the screen at the moment is displayed formally, the driving parameters of the driver corresponding to the position can be adjusted to eliminate the speckles.
As described above, several vibrators are provided on the back surface of the screen, but the positions where speckle occurs may correspond to a plurality of vibrators, or may not exist.
When there are a plurality of vibrators corresponding to the positions where the speckles occur, the driving parameters at the corresponding plurality of drivers can be simultaneously adjusted.
And when no vibrator exists at the position where the speckles appear, starting from the driving parameters of the adjacent driver, the simplest way is to directly adjust the driving parameters of the driver closest to the position, or simultaneously adjust the driving parameters of all or part of the adjacent drivers, the adjustment amplitude and the respective proximity degree of the drivers are related to the position, the smaller the adjustment amplitude with the higher proximity degree is, the larger the adjustment amplitude with the lower proximity degree is, namely, the adjustment amplitude is in inverse proportion to the proximity degree, so that the speckles at the position can be eliminated by comprehensively adjusting the vibrators.
The third embodiment of the present invention further provides a screen vibrating system, as shown in fig. 3, including a vibrator 31, a driver 32, a vibration sensor 33, and a controller 34.
Wherein, vibrator 31 is used for driving the screen vibration, and the quantity of vibrator 31 is not limited, can set up according to the material characteristic flexibility of screen size, screen itself, and vibrator 31 can be attached directly or attached at the back of screen indirectly through the glue film.
A driver 32 for driving the vibrator 31,. The driver 32 is electrically connected to the vibrator 31, and is configured to output a driving signal to the vibrator 31 to drive the vibrator 31, so as to drive the screen to vibrate together when the vibrator 31 is driven. The driving signal may be a direct current driving signal or an alternating current driving signal, and driving parameters such as frequency and voltage of the driving signal may be adjusted by the instruction.
The vibration sensor 33 is used for detecting vibration data capable of reflecting the amplitude of the screen, can be fixed with the vibrator 31 to directly detect the vibration information of the vibrator 31, and can also be attached to the back of the screen without directly contacting with the vibrator 31 to detect the vibration information of the screen. The vibration data includes one or more of displacement data, acceleration data, and velocity data of the vibrator 31 itself; or the vibration data comprises one or more of displacement data, acceleration data and speed data of the vibration position of the screen driven by the screen.
And a controller 34 for receiving vibration data reflecting the amplitude of the screen and controlling the driving parameters of the driver 32 according to the vibration data such that the vibration data is maintained within a preset reference range.
Specifically, the controller 34 is configured to adjust the driving parameters of the driver 32 when it is detected that the vibration data is larger than the upper limit of the preset reference range, until the vibration data falls within the preset reference range; and is further configured to adjust the driving parameters of the driver 32 when the detected vibration data is smaller than the lower limit of the preset reference range, until the vibration data rises to be within the preset reference range.
The driving parameters comprise output frequency and output voltage, and the output voltage can be realized by changing the duty ratio of the driving signal. When the driving parameters are adjusted, a certain adjustment step length can be preset, and the step length is taken as the amplitude for adjustment every time. As described above, when the output frequency is adjusted, adjustment toward a direction close to the overall natural frequency of the vibrator means that the vibration data will rise, and adjustment toward a direction away from the overall natural frequency of the vibrator means that the vibration data will fall. In addition, only the output frequency may be specifically adjusted, only the output voltage may be adjusted, or the output frequency may be adjusted first, and when the vibration data cannot be adjusted to the target value, the output voltage is attempted to be adjusted, and vice versa.
Further, the screen vibrating system further comprises a communication module 35, and the controller 34 is further configured to receive an instruction from the projector through the communication module 35, and control the driver 32 to turn on or off according to the instruction; the instructions carry information on the operating state of the projector. For example, the driver may be controlled to be off when the projector has not started projection or the projection ends, and to be on when the projector is projecting normally.
In addition, the controller 34 can also establish communication with the background through the communication module 35, and upload the working state of the vibrator 31 to the background, so that background personnel can know conveniently, and can take remedial measures in time when a fault occurs.
Further, the number of the vibrators 31 is several, and each vibrator 31 is used for driving a corresponding position on the screen to vibrate. At this time, the controller 34 is further configured to adjust the driving parameters of the driver corresponding to the position where the speckle appears when the speckle appears due to the picture projected on the screen. The mode of only adjusting the drive parameters of part of the drivers is more targeted and simpler, and the workload of the system can be reduced.
In addition, when there are a plurality of vibrators corresponding to the positions where speckle occurs, the driving parameters at the corresponding plurality of drivers can be simultaneously adjusted.
And when no vibrator exists at the position where the speckles appear, starting from the driving parameters of the adjacent driver, the simplest way is to directly adjust the driving parameters of the driver closest to the position, or simultaneously adjust the driving parameters of all or part of the adjacent drivers, the adjustment amplitude and the respective proximity degree of the drivers are related to the position, the smaller the adjustment amplitude with the higher proximity degree is, the larger the adjustment amplitude with the lower proximity degree is, namely, the adjustment amplitude is in inverse proportion to the proximity degree, so that the speckles at the position can be eliminated by comprehensively adjusting the vibrators.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The control method of the screen vibration system is characterized in that the screen vibration system comprises a vibrator for driving a screen to vibrate and a driver for driving the vibrator; the control method comprises the following steps:
receiving vibration data for reflecting the amplitude of the screen;
and controlling the driving parameters of the driver according to the vibration data so that the vibration data are maintained within a preset reference range.
2. The control method according to claim 1, wherein the controlling the driving parameters of the driver according to the vibration data so that the vibration data is maintained within a preset reference range comprises:
when the vibration data is detected to be larger than the upper limit of a preset reference range, adjusting the driving parameters of the driver until the vibration data is reduced to be within the preset reference range;
and when the vibration data is detected to be smaller than the lower limit of the preset reference range, adjusting the driving parameters of the driver until the vibration data rises to the preset reference range.
3. The control method of claim 1, wherein the vibration data includes one or more of displacement data, acceleration data, and velocity data of the vibrator itself; or the vibration data comprises one or more of displacement data, acceleration data and speed data of the vibration position of the screen driven by the screen.
4. The control method according to claim 1, characterized by further comprising:
receiving instructions of a projector; the instruction carries the working state information of the projector;
and controlling the opening and closing of the driver according to the instruction.
5. The control method of claim 1, wherein the number of the vibrators is several, and each vibrator is used for driving a corresponding position on the screen to vibrate;
the controlling the driving parameters of the driver according to the vibration data so that the vibration data is maintained within a preset reference range comprises:
when the image projected on the screen can cause speckles, adjusting the driving parameters of the driver corresponding to the positions where the speckles appear to eliminate the speckles.
6. A screen vibratory system, comprising:
the vibrator is used for driving the screen to vibrate;
a driver for driving the vibrator;
the vibration sensor is used for detecting vibration data capable of reflecting the amplitude of the screen;
and the controller is used for receiving vibration data for reflecting the amplitude of the screen and controlling the driving parameters of the driver according to the vibration data so that the vibration data are maintained in a preset reference range.
7. The screen vibrating system according to claim 6, wherein the controller is configured to adjust the driving parameters of the driver when the vibration data is detected to be greater than an upper limit of a preset reference range until the vibration data falls within the preset reference range; and when the vibration data is detected to be smaller than the lower limit of the preset reference range, adjusting the driving parameters of the driver until the vibration data rises to be within the preset reference range.
8. The screen vibration system of claim 6 wherein the vibration data comprises one or more of displacement data, acceleration data, velocity data of the vibrator itself; or the vibration data comprises one or more of displacement data, acceleration data and speed data of the vibration position of the screen driven by the screen.
9. The screen vibrating system according to claim 6, wherein said controller is further adapted to receive commands from a projector and to control said actuator to open and close in response to said commands; the instructions carry information on the operating state of the projector.
10. The screen vibrating system according to claim 6, wherein said plurality of vibrators are each adapted to vibrate a respective corresponding location on the screen;
the controller is also used for adjusting the driving parameters of the driver corresponding to the position where the speckles appear when the images projected on the screen can cause the speckles to appear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372071.9A CN114675430A (en) | 2022-04-11 | 2022-04-11 | Screen vibration system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372071.9A CN114675430A (en) | 2022-04-11 | 2022-04-11 | Screen vibration system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114675430A true CN114675430A (en) | 2022-06-28 |
Family
ID=82079044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210372071.9A Pending CN114675430A (en) | 2022-04-11 | 2022-04-11 | Screen vibration system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114675430A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142602A (en) * | 2013-05-09 | 2014-11-12 | 图象公司 | Methods and systems of vibrating a screen |
| CN105759553A (en) * | 2016-05-10 | 2016-07-13 | 郑强 | Screen speckle removing system and speckle removing method thereof |
| CN108683761A (en) * | 2018-05-17 | 2018-10-19 | Oppo广东移动通信有限公司 | Sounding control method, device, electronic device and computer-readable medium |
| CN109144460A (en) * | 2018-07-09 | 2019-01-04 | Oppo广东移动通信有限公司 | Sounding control method, device, electronic device and storage medium |
| CN213182307U (en) * | 2020-09-27 | 2021-05-11 | 深圳光峰科技股份有限公司 | Projection screen |
| WO2022001502A1 (en) * | 2020-06-30 | 2022-01-06 | 中兴通讯股份有限公司 | Screen over-vibration protection method, electronic device and storage medium |
-
2022
- 2022-04-11 CN CN202210372071.9A patent/CN114675430A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142602A (en) * | 2013-05-09 | 2014-11-12 | 图象公司 | Methods and systems of vibrating a screen |
| CN105759553A (en) * | 2016-05-10 | 2016-07-13 | 郑强 | Screen speckle removing system and speckle removing method thereof |
| CN108683761A (en) * | 2018-05-17 | 2018-10-19 | Oppo广东移动通信有限公司 | Sounding control method, device, electronic device and computer-readable medium |
| CN109144460A (en) * | 2018-07-09 | 2019-01-04 | Oppo广东移动通信有限公司 | Sounding control method, device, electronic device and storage medium |
| WO2022001502A1 (en) * | 2020-06-30 | 2022-01-06 | 中兴通讯股份有限公司 | Screen over-vibration protection method, electronic device and storage medium |
| CN213182307U (en) * | 2020-09-27 | 2021-05-11 | 深圳光峰科技股份有限公司 | Projection screen |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7088885B2 (en) | Screen vibration method and system | |
| JP3265854B2 (en) | Image output device | |
| JP6691121B2 (en) | Screen vibration method and system | |
| US20080110265A1 (en) | Auto-focusing method and projector using the same | |
| US20180321483A1 (en) | Opening angle stabilization of micromirrors through current drive control | |
| US20230336697A1 (en) | Laser projection apparatus and operating method thereof | |
| CN105759553A (en) | Screen speckle removing system and speckle removing method thereof | |
| CN114675430A (en) | Screen vibration system and control method thereof | |
| US7494226B2 (en) | Methods and apparatus for controlling projectors | |
| JP5609370B2 (en) | Image display device | |
| CN111487762B (en) | Adjustment method of laser display device and laser display device | |
| JP2014240895A (en) | Optical scanner, image forming apparatus, and video projecting device | |
| JP2015099270A (en) | Vibration device, optical scanner, and image forming apparatus and video projection device using the same | |
| JP2003005123A (en) | Optical scanner and driving method for optical scanner | |
| JP2019133068A (en) | Projection device, control method and program of the same | |
| CN217305699U (en) | Be used for PET and PC material screen laser vibration arm | |
| JP2014240894A (en) | Optical scanner, image forming apparatus, and video projecting device | |
| JP6104063B2 (en) | Optical scanning apparatus, image forming apparatus, and video projection apparatus | |
| JP2006248123A5 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |