CN213182307U - Projection screen - Google Patents
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- CN213182307U CN213182307U CN202022160627.7U CN202022160627U CN213182307U CN 213182307 U CN213182307 U CN 213182307U CN 202022160627 U CN202022160627 U CN 202022160627U CN 213182307 U CN213182307 U CN 213182307U
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- 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
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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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The embodiment of the application provides a projection screen, and relates to the technical field of laser projection. The projection screen comprises a screen, a connecting column, a screen vibration component, a detection component and a driving motor. Spliced pole fixed connection is in the both sides of screen, and screen vibration subassembly is connected in the spliced pole. The detection component is connected to the screen, the connecting column or the screen vibration component and is used for detecting the vibration amplitude of the parts connected with the detection component. The driving motor is connected with the screen vibration assembly, and the detection assembly is electrically connected with the driving motor. When the vibration amplitude detected by the detection assembly is smaller than or equal to the preset amplitude, the driving motor drives the screen vibration assembly to drive the screen to vibrate along the preset direction. This projection screen passes through screen vibration subassembly and drives the screen vibration, through the feedback loop of determine module for driving motor drive screen vibration subassembly drives the screen and is in the vibration state all the time, avoids the screen at the unexpected quiescent condition of vibration in-process, ensures that the screen realizes the dissipation spot effect of serialization.
Description
Technical Field
The application belongs to the technical field of laser projection, and more particularly relates to a projection screen.
Background
With the development of science and technology, laser projection display is more and more popular with audiences by virtue of the advantages of high brightness, large color gamut and the like.
However, since laser projection is a coherent light source, a speckle phenomenon occurs. Thereby affecting the viewing experience of the viewer.
SUMMERY OF THE UTILITY MODEL
Objects of the present application include, for example, providing a projection screen to improve screen speckle and enhance the viewing experience for use.
The embodiment of the application can be realized as follows:
in a first aspect, a projection screen is provided, which includes a screen, a connection column, a screen vibration assembly, a detection assembly, and a driving motor. Spliced pole fixed connection is in the both sides of screen, and screen vibration subassembly is connected in the spliced pole. The detection component is connected to the screen, the connecting column or the screen vibration component and used for detecting the vibration amplitude of the screen, the connecting column or the screen vibration component. The driving motor is connected with the screen vibration assembly, and the detection assembly is electrically connected with the driving motor. When the vibration amplitude detected by the detection assembly is smaller than or equal to the preset amplitude, the driving motor drives the screen vibration assembly to drive the screen to vibrate along the preset direction.
This application embodiment connects the both sides of screen through the spliced pole, drives the unsettled state of screen at the spliced pole under, through the characteristic that screen vibration subassembly drove the screen vibration. The amplitude of the light wave electric field focused by human eyes is changed, so that the human eyes cannot distinguish image speckles under the integral effect, and the effect of eliminating the speckles is achieved.
The vibration amplitude detection device is connected to a screen, a connecting column or a screen vibration assembly through a detection assembly, is used for detecting the vibration amplitude of a part connected with the detection assembly, and is electrically connected with a driving motor. When the vibration amplitude detected by the detection assembly is smaller than or equal to the preset amplitude, the driving motor drives the screen vibration assembly to drive the screen to vibrate along the preset direction.
Through the feedback loop of the detection assembly, the driving motor drives the screen vibration assembly to drive the screen to supply pulse vibration in the vibration process. Thereby avoiding a sudden static state of the screen during vibration. So as to ensure that the screen is always in a vibration state and realize continuous speckle dissipation effect. In addition, energy is saved and noise is reduced while speckle elimination of the screen is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a diagram showing the minimum image light spot intensity distribution distinguishable by human eyes;
fig. 2 is a schematic structural diagram of a projection screen provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of speckle;
FIG. 4 is a schematic diagram of the synchronous driving timing of the down-conversion speckle removal;
FIG. 5 is a schematic view of the driving motor;
FIG. 6 is a schematic diagram of the matching of the downconversion speckle reduction driver to the screen local oscillator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
The laser light source is a new light source technology, and is an electric light source for the excited state particles to emit light under the action of excited radiation. The LED light source is widely applied due to the advantages of high brightness, long service life, strong directivity, good color rendering and the like.
Laser projection is a projector that employs a laser light source. The light source of the projector goes from the conventional light source to the LED light source to the laser light source. Compared with the former, the laser light source has the advantages of brightness, luminous efficiency, light source service life and environmental protection.
The service life of the laser source projector is about twenty thousand hours generally, the attenuation of the light source brightness of the projector along with the service time is slow, and the maintenance period is long. The laser is projected on the color gamut display of the projection picture, the brightness is high, and the color is real. Compared with the traditional light source and the LED light source, the projection picture has rich and real projection. And the laser light source is a green nontoxic product, so that the use is safer.
At present, laser products are widely applied to front projection projectors, large-scale cinema projection equipment and the like, and gradually become mainstream products of DLP splicing products at present along with the development of science and technology.
However, the laser has good monochromaticity and coherence (good monochromaticity and stable phase difference). The laser projection picture is scattered (transmitted or reflected) by the rough surface to form a real image, and the rough surface with variable fluctuation plays a role of randomly changing the phase, so the wave front phase distribution of the projection picture is changed. In other words, when the laser light is irradiated onto a rough surface of a general object and reflected from an uneven place into the eye, there is a slight optical path difference. They interfere with each other, and some are constructive and destructive, thereby forming bright and dark spots, i.e., the laser speckle phenomenon. The laser speckle phenomenon can seriously affect the viewing experience of the viewer.
Referring to fig. 1, at a certain distance, the initial phase of the wavefront phase of the minimum image spot resolvable by the human eye is 0, and the minimum image spot is subjected to phase modulation by the rough surface microstructure and then imaged by the human eye. The phase distribution of the picture wavefront before entering the human eye is
The electric field vector is expressed as follows:
where a is the amplitude of the electric field vector, assuming that the surface microstructure only changes phase, without transmittance modulation, the amplitude remains unchanged. Electric field vector E 'of the minimum resolvable spot by phase modulation of the eye'0(x, y) focused on retina, E'0(x, y) is represented by the following formula:
wherein
Phase modulation of the optical wavefront for the eye.
On the retinal plane (u, v plane), the electric field vector is distributed as E according to the scalar diffraction theoryf(u, v), defined by the formula:
where λ is the wavelength of monochromatic light and f is the equivalent focal length of the human eye.
E in formula (3)f(u, v) is the laser focused on the retinal planeThe optical electric field vector, which is seen as the sum of a plurality of vectors, is not only related to the amplitude A of the electric field vector, but also to the phase modulation of the spot by the diffusion structure
And (4) correlating. The human eye only responds to the electric field intensity I of light and cannot induce the phase of the light wave, so the phase factor before the integral sign in the formula (3) can be ignored, and the relation of the electric field intensity I is obtained as follows:
as can be seen from the formula (4), the final human eye's light intensity or brightness response to the minimum distinguishable light spot depends not only on the amplitude A of the light wave electric field, but also on the phase modulation of the wavefront by the surface microstructure
Because the scattering microstructures in different areas of the projection picture are different and the phase modulation degree is different, the light intensity distribution I formed on the retinaf(u, v) have random fluctuations, which are responsible for the formation of speckle.
According to Rayleigh studies by scientists, light intensity IfThe size of (u, v) follows a gaussian distribution.
Currently, there are many methods for resolving speckle or reducing speckle contrast, such as wavelength division, temporal coherence reduction, rolling average, etc.
The wavelength division method is to select several lasers with the same color but different wavelengths in the light source laser. Because the laser with different wavelengths can not generate interference phenomenon, the speckle contrast can be reduced. However, the method has strict requirements on the wavelength selection of the light source, and the product cost can be greatly increased.
Specifically, the speckle contrast is defined as follows:
where, σ is the luminance standard deviation of the speckle,
is the luminance average of the speckle.
The term "reduction of temporal coherence" means that the laser light source for projection has a relatively short coherence time, and a particle diffusion layer such as bulk diffusion can be used, and the number of reflections of laser light differs from one laser light source to another, and the optical path length differs from one laser light source to another. When the optical path exceeds the coherent length, the interference effect of the laser disappears, and the function of eliminating speckles is achieved. However, this method uses materials such as bulk diffusion, which limits the application scenarios, and if the bulk diffusion materials are placed in the optical machine, the light efficiency of the projector will also be reduced.
The rotation averaging method is a method in which a rotating element is used in a laser beam path in a laser projector. The shape of the speckle pattern is affected because the wavefront phase will have a different distribution as the laser light passes through different surfaces of the rotating element. And the rapid change of different speckle patterns is overlapped in the human eye integration time, so that the speckle contrast can be effectively reduced. However, the rotating element is generally bulky and needs to be driven by a motor, which increases the volume of the projector and is prone to generate noise.
In view of the above problem, referring to fig. 2, an embodiment of the present invention provides a projection screen 100.
The projection screen 100 uses the connecting column 120 to connect the screen 110, and under the suspended state of the connecting column 120, the screen 110 is driven to vibrate by the screen vibration component 130, so that the amplitude A of the focused light wave electric field in human eyes is changed, the human eyes can not distinguish the image speckles under the integral effect, and the effect of eliminating the speckles is achieved. In addition, the speckle elimination of the screen 110 is realized, and simultaneously, energy is saved and noise is reduced.
Specifically, the projection screen 100 includes a screen 110, a connection column 120, a screen vibrating assembly 130, a detecting assembly, and a driving motor 150.
The connection column 120 is fixedly connected to both sides of the screen 110, the screen vibration assembly 130 is connected to the connection column 120, and the driving motor 150 is connected to the screen vibration assembly 130 to realize the vibration of the projection screen 100. The sensing assembly is connected to the screen 110, the connection column 120 or the screen vibration assembly 130, the sensing assembly is used to sense the vibration amplitude of the components connected thereto, and the sensing assembly is electrically connected to the driving motor 150. When the vibration amplitude detected by the detection component is smaller than or equal to the preset amplitude, the driving motor 150 drives the screen vibration component 130 to drive the screen 110 to vibrate along a preset direction (the preset direction is a direction perpendicular to the screen).
The driving motor 150 drives the screen vibrating assembly 130 to drive the screen 110 to make pulse vibration in the vibrating process. When the force direction applied by the driving motor 150 on the screen vibrating assembly 130 is opposite to the forced vibration direction of the screen vibrating assembly 130 (specifically, the first elastic element 134), the forced vibration of the screen vibrating assembly 130 (specifically, the first elastic element 134) may be cancelled, and the speckle phenomenon of the projected image of the screen 110 may be reproduced. Therefore, the projection screen 100 provided in the embodiment of the present application is used to avoid a sudden static state of the screen 110 during the vibration process through a feedback loop of the detection component. So as to ensure that the screen 110 is always in a vibration state, and realize a continuous speckle dissipation effect.
The projection screen 100 provided in the embodiments of the present application will be described in detail below.
Optionally, the connecting columns 120 are elongated rod-shaped structures, and the number of the connecting columns 120 is two. Two connection posts 120 are connected to both sides of the screen 110 in the length direction, respectively. And the length of the connection column 120 is greater than or equal to the width of the screen 110, so that two ends of the connection column 120 protrude out of two sides of the screen 110 in the width direction, or two ends of the connection column 120 are flush with two sides of the screen 110 in the width direction. When the screen 110 is in a flat state, the connecting column 120 and the screen 110 are located in the same plane.
The screen vibration component 130 is connected with the connecting column 120, so that the screen vibration component 130 drives the screen 110 to vibrate through the connecting column 120.
Specifically, the screen vibrating assembly 130 includes a driving post 132 and a first elastic member 134.
The driving post 132 is also an elongated rod-shaped structure, and the first elastic member 134 is connected between the connecting post 120 and the driving post 132. The power output end of the driving motor 150 is connected to the transmission post 132 in a transmission manner, and under the driving of the driving motor 150, the transmission post 132 drives the first elastic member 134, the first elastic member 134 drives the connection post 120, and the connection post 120 drives the screen 110 to vibrate along the first direction 138.
The projection screen 100 provided in the embodiment of the present application reuses the energy of the first elastic member 134 to damp the vibration, so as to achieve the purpose of reducing the energy consumption.
Optionally, the screen vibrating assemblies 130 are at least two groups, and at least two groups of screen vibrating assemblies 130 correspond to two connecting posts 120, so that the screen 110 is driven to vibrate from two sides of the screen 110 at the same time. Optionally, the screen vibrating assemblies 130 are two sets, and the two sets of screen vibrating assemblies 130 are connected to the two connecting columns 120 in a one-to-one correspondence manner.
To improve the stability of the connecting column 120 in vibrating the screen 110 in the first direction 138. Optionally, there are a plurality of first elastic members 134 in each set of screen vibrating assembly 130. The parameters of the first elastic members 134 are the same, and the first elastic members 134 are sequentially arranged in parallel at intervals. Each of the first elastic members 134 is connected between the connection post 120 and the transmission post 132, and the stability of the screen 110 to vibrate can be greatly improved by the plurality of first elastic members 134 being forced to damp the vibration at the same time.
Further, in order to make the screen vibrating assembly 130 drive the screen 110 to stably vibrate along the first direction 138 through the connecting column 120, the deflection phenomenon does not occur.
Optionally, the screen vibrating assembly 130 further includes a guide 136.
Specifically, the guide member 136 has a guide groove, and the driving post 132 includes a clamping portion matched with the guide groove. After assembly, the clamping portion of the transmission column 132 is clamped in the guide slot of the guide member 136, and the transmission column 132 performs one-dimensional transmission motion along the first direction 138 under the driving of the driving motor 150.
It is understood that the guiding element 136 may also be a rail structure, for example, the longitudinal section is i-shaped, and the engaging portion of the driving post 132 may be engaged with the rail. Thereby causing the drive post 132 to move in the direction of extension of the guide 136. The present application does not limit the specific structure of the connection position between the guide 136 and the transmission post 132, as long as the transmission post 132 can be slidably fitted along the extending direction of the guide 136.
The projection screen 100 provided in the embodiment of the present application is that the connecting column 120 is in the suspension state, and the screen vibration component 130 drives the screen 110 to vibrate along the preset direction through the connecting column 120, and the characteristic of damping vibration of the first elastic member 134 is utilized, so that the speckle is reduced, and meanwhile, the frequency reduction vibration effect of the screen 110 is realized.
Further, the projection screen 100 provided in the embodiment of the present application further includes a suspension 140.
A suspension member 140 is coupled to the connecting pole 120 and is capable of suspending the connecting pole 120.
Specifically, one end of the suspension member 140 is fixedly connected to the connecting column 120, and the other end of the suspension member 140 is fixedly connected to a wall or a rack fixed to the ground. The hanging member 140 is made of a material having no or little elastic deformation, and the specific connection position is determined according to the actual situation of the surrounding environment, as long as the connection pole 120 is suspended by the hanging member 140.
Optionally, the hanging member 140 is a steel wire that is fixedly connected to the top of the connecting column 120, so as to hang the connecting column 120 in the air.
The screen 110 is driven by the screen vibration component 130 to vibrate along a preset direction with a small amplitude, so that the effect of rapid change of speckle patterns is achieved. Currently, the method of vibrating the screen 110 is to vibrate at a frequency of about 60Hz using a plurality of motors. However, the screen 110 may be fluffy during the vibration process, which may cause the rapid change of the speckle pattern of the screen 110 to have poor stability, thereby affecting the projection effect.
Further, the projection screen 100 provided herein further includes a screen tensioning assembly 160.
Specifically, the screen tensioning assembly 160 includes a support post and a second elastic member 164. Wherein the supporting column is fixedly connected to a workbench (the workbench may be a ground, a workbench which can be fixed relative to the ground, or a frame which is fixed relative to the ground, etc.), and the second elastic member 164 is connected between the connecting column 120 and the supporting column. The vibration of the connection post 120 and the screen 110 in the second direction 166 is limited by the support post and the second elastic member 164.
Wherein the second direction 166 is at an angle to the first direction 138.
Optionally, the number of the screen tensioning assemblies 160 is at least two, and at least two sets of the screen tensioning assemblies 160 are correspondingly connected to the connecting column 120. A pulling force is applied to the screen 110 by the screen tensioning assembly 160 so that the screen 110 can be always in a tensioned state.
The projection screen 100 of the embodiment of the present application applies a driving force to the screen 110 along the first direction 138 through the screen vibrating assembly 130, and applies a pulling force to the screen 110 along the second direction 166 through the screen tensioning assembly 160. The screen 110 is vibrated along a preset direction under the combined action of the driving force and the pulling force, and the screen 110 is always in a tensioned and flat state. Therefore, the fluffy phenomenon of the screen 110 is eliminated, and the stability of the rapid change of the speckle pattern of the screen 110 is improved. And the screen 110 can be beneficial to reducing energy consumption by multiplexing the vibration capability of the first elastic member 134.
Optionally, the first direction 138 is the same as the preset direction, and the second direction 166 is perpendicular to the first direction 138. Thereby, the driving force applied from the screen vibrating assembly 130 and the pulling force applied from the screen tensioning assembly 160 can be reduced, so that the screen 110 can reach a preset motion state, and the output power of the driving motor 150 can be reduced.
Further, the first elastic member 134 and the second elastic member 164 are both springs, and the stiffness coefficient of the second elastic member 164 is greater than that of the first elastic member 134. Therefore, while the first elastic member 134 drives the screen 110 to move along the preset direction, the second elastic member 164 can tension the screen 110 well, so as to reduce the possibility of a fluffy state of the screen 110, and improve the stability of the vibration of the screen 110.
In order to further improve the efficiency of the low-frequency vibration screen 110 in speckle elimination, and eliminate the potential beat frequency effect through synchronous control, the long-term effective operation of the speckle elimination scheme of the low-frequency vibration screen 110 is ensured.
Specifically, the detecting assembly is fixedly connected to the screen 110, the connecting column 120 or the first elastic member 134. The vibration amplitude of the screen 110, the connecting column 120 or the first elastic member 134 connected thereto is detected by the detecting component, and when the detected vibration amplitude is smaller than or equal to the preset vibration amplitude of the screen 110, a signal is sent to the driving motor 150, and the driving motor 150 drives the transmission column 132 to move along the first direction 138, so that the screen vibrating component 130 drives the screen 110 to vibrate along the preset direction.
Optionally, the detecting component is a displacement sensor, for example, an infrared detector, a radar, an ultrasonic sensor, and the like. The displacement sensor is fixedly arranged on the screen 110 or the connecting column 120, and the vibration condition of the screen 110 is detected through the detection component. The displacement sensor is electrically connected to the driving motor 150, and the driving motor 150 is operated according to a detection result of the displacement sensor.
Since the vibration of the screen 110 is approximately a ringing. Thus, the detection assembly may detect a displacement signal, shaped as shown in fig. 3, by which the drive motor 150 is caused to move synchronously. That is, the driving motor 150 is started at the same signal position each time, and the driving motor 150 drives the screen 110 to vibrate through the screen vibrating component 130, so that the real-time vibration amplitude of the screen 110 or the connecting column 120 connected with the detecting component can be accurately detected.
Further, the driving frequency of the driving motor 150 is the same as the local oscillation frequency of the screen 110.
The detecting component ensures that the vibration condition of the screen 110 (i.e. the displacement of the screen 110 relative to the equilibrium position, the vibration speed of the screen 110, etc.) is completely consistent each time the driving motor 150 is operated. Therefore, the driving motor 150 has good consistency every time the screen 110 is driven, and the beat frequency effect caused by the mismatch of the driving frequency of the driving motor 150 and the local oscillation frequency of the screen 110 can be avoided.
If the beat frequency effect exists, the vibration condition of the driving motor 150 is inconsistent every time the screen 110 is driven, and the driving failure occurs at some time, which further causes the screen 110 to vibrate and even causes the screen 110 to be static. In this case, the viewer may observe relatively severe speckle at these times.
In addition, by setting the driving frequency of the driving motor 150 to coincide with the local oscillation frequency of the screen 110, the driving efficiency of the driving motor 150 is maximized. Good vibration of the screen 110 is realized with the minimum energy, the optimized driving efficiency is realized, and further frequency reduction, noise reduction and energy saving are realized.
Referring to fig. 4, the vibration of the screen 110 itself can be regarded as a damped oscillation. The amplitude of the vibration of the screen 110 gradually decreases with time, resulting in a gradually decreasing amount of vibration displacement for each vibration. In order to ensure a good speckle removing effect, the screen 110 needs to vibrate with a certain vibration amplitude. For example: as shown in fig. 4, the vibration below the dotted line does not have a good speckle removal effect, while the vibration above the dotted line has a good speckle removal effect.
Therefore, the displacement amount of the screen 110 when it vibrates can be determined by the detection member, and then the position where the driving motor 150 is operated can be obtained.
For example: in the embodiment shown in fig. 4, the first 5 vibration cycles of the screen 110 may satisfy the speckle dissipation requirement. Therefore, after the screen 110 has vibrated for 5 cycles, the detecting component sends a signal to the driving motor 150, and the driving motor 150 acts to realize the synchronous vibration of the screen 110.
Referring to fig. 5 and 6, the detecting element sends a synchronous signal to the driving motor 150 at intervals, and the driving motor 150 is turned on for a short time after receiving the synchronous signal to drive the screen vibrating element 130 to vibrate the screen 110.
The driving voltage of the driving motor 150 of fig. 5 corresponds to a frequency spectrum signal indicated by an arrow in fig. 6. Since the motion of the drive motor 150 is periodic, its frequency spectrum is a discretized signal with components only at the fundamental frequency and the frequency multiplier, whose signal strengths are determined by the shape of the drive signal during each period.
In FIG. 6, f0The local oscillation frequency of the screen 110 is a frequency multiplication of the driving signal of the driving motor 150, and the signal synchronization is realized through the detection component in the projection screen 100 according to the embodiment of the present application, so that the local oscillation frequency of the screen 110 is strictly speaking a frequency multiplication of the driving signal of the driving motor 150.
In the embodiment shown in fig. 4, the driving fundamental frequency of the driving motor 150 is 1/5 of the screen local oscillation frequency. Therefore, the 5-fold frequency component of the driving signal of the driving motor 150 falls exactly on the local oscillation frequency of the screen 110 vibration, and has the highest driving efficiency.
According to the projection screen 100 provided by the embodiment of the application, the screen 110 is driven to vibrate along the preset direction by the screen vibration component 130 and the connecting column 120, so that the effect of continuously eliminating speckles is achieved; the first elastic piece 134 has the characteristic of damping vibration, so that the frequency reduction vibration, the energy conservation and the noise reduction are realized; the displacement signal of the screen 110 or the screen vibration assembly 130 is detected in real time by the detection assembly and used to synchronously control the motor. The frequency doubling of the driving signal of the driving motor 150 is ensured to fall on the local oscillation frequency of the first elastic element 134, the driving efficiency is maximized, the beat frequency phenomenon (namely, the screen vibrates constantly, and sudden static conditions are avoided at certain moments) is avoided, and finally the continuous frequency reduction and speckle elimination of the screen are ensured. In addition, the stability of the screen 110 in vibration is improved by the screen tensioning assembly 160, and the probability of the screen 110 being fluffy in the screen vibration process is reduced.
In summary, the projection screen 100 provided in the embodiment of the present application optimizes the speckle-dissipating capability of the existing screen (including the movie screen and the projection soft screen), improves the stability of the performance of the screen 110 for dissipating speckle by vibration, ensures the continuous implementation of reducing frequency and vibrating speckle, and further optimizes the energy-saving and noise-reducing effects.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A projection screen, comprising:
a screen;
the connecting columns are fixedly connected to two sides of the screen;
the screen vibration component is connected to the connecting column;
the detection component is connected to the screen, the connecting column or the screen vibration component and is used for detecting the vibration amplitude of the screen, the connecting column or the screen vibration component; and
the driving motor, driving motor with the screen vibration subassembly is connected, detecting element with the driving motor electricity is connected, works as when the vibration amplitude that detecting element detected is less than or equal to predetermines the amplitude, the driving motor drive the screen vibration subassembly drives the screen is along predetermineeing the direction vibration.
2. The projection screen of claim 1 wherein the screen vibrating assembly comprises:
the transmission column is connected with the power output end of the driving motor; and
the first elastic piece is connected between the connecting column and the transmission column and drives the screen to vibrate along a first direction under the action of the driving motor.
3. The projection screen of claim 2 wherein the screen vibratory assembly further comprises a guide fixedly attached to the table and extending in the first direction, the drive post slidably coupled to the guide.
4. The projection screen of claim 3, wherein the guide member defines a guide slot, the transmission post includes a locking portion engaged with the guide slot, and the locking portion is locked in the guide slot.
5. The projection screen of claim 2, further comprising a screen tensioning assembly, the screen tensioning assembly comprising:
the supporting column is fixedly connected to the workbench; and
the second elastic piece is connected between the connecting column and the supporting column and used for limiting vibration of the connecting column in a second direction with an included angle in the first direction.
6. The projection screen of claim 5 wherein the first direction is the same as the predetermined direction and the second direction is perpendicular to the first direction.
7. The projection screen of claim 5 wherein the second resilient member has a coefficient of stiffness that is greater than a coefficient of stiffness of the first resilient member.
8. The projection screen of claim 1 further comprising a suspension member coupled to the attachment column and capable of suspending the attachment column.
9. The projection screen of claim 2 wherein the detection assembly is fixedly attached to the screen, the attachment post, or the first resilient member.
10. The projection screen of any one of claims 1-9 wherein the detection component is a displacement sensor;
when the displacement sensor detects that the vibration amplitude of the screen is equal to the preset amplitude, a signal is sent to the driving motor, the driving motor drives the screen vibration assembly to drive the screen to vibrate along the preset direction, and the driving frequency of the driving motor is the same as the local oscillation frequency of the screen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022160627.7U CN213182307U (en) | 2020-09-27 | 2020-09-27 | Projection screen |
| PCT/CN2021/116812 WO2022062892A1 (en) | 2020-09-27 | 2021-09-07 | Projection screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022160627.7U CN213182307U (en) | 2020-09-27 | 2020-09-27 | Projection screen |
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| CN213182307U true CN213182307U (en) | 2021-05-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113674662A (en) * | 2021-07-23 | 2021-11-19 | 华为技术有限公司 | Display system and control method thereof, projector and projection system |
| WO2022062892A1 (en) * | 2020-09-27 | 2022-03-31 | 深圳光峰科技股份有限公司 | Projection screen |
| CN114675430A (en) * | 2022-04-11 | 2022-06-28 | 深圳市时代华影科技股份有限公司 | Screen vibration system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5565940A (en) * | 1978-11-13 | 1980-05-17 | Matsushita Electric Ind Co Ltd | Laser image display device |
| EP1260850B1 (en) * | 2001-05-25 | 2005-11-02 | EADS Deutschland GmbH | Method and device for removing stationary defects of images during projection with spatially or temporally coherent light and system for image projection |
| JP4757935B2 (en) * | 2008-07-23 | 2011-08-24 | 三菱電機株式会社 | Projection-type image display device |
| CN102023470A (en) * | 2009-09-16 | 2011-04-20 | 北京中视中科光电技术有限公司 | Rear projection screen |
| US10401631B2 (en) * | 2015-01-21 | 2019-09-03 | Hitachi-Lg Data Storage, Inc. | Image display device |
| CN110286553A (en) * | 2019-06-25 | 2019-09-27 | 四川长虹电器股份有限公司 | The screen and screen system of laser speckle can be eliminated |
| CN110412823A (en) * | 2019-07-30 | 2019-11-05 | 苏州金双宇光电科技有限公司 | A kind of netted projection screen of vibration |
| CN213182307U (en) * | 2020-09-27 | 2021-05-11 | 深圳光峰科技股份有限公司 | Projection screen |
-
2020
- 2020-09-27 CN CN202022160627.7U patent/CN213182307U/en active Active
-
2021
- 2021-09-07 WO PCT/CN2021/116812 patent/WO2022062892A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022062892A1 (en) * | 2020-09-27 | 2022-03-31 | 深圳光峰科技股份有限公司 | Projection screen |
| CN113674662A (en) * | 2021-07-23 | 2021-11-19 | 华为技术有限公司 | Display system and control method thereof, projector and projection system |
| CN114675430A (en) * | 2022-04-11 | 2022-06-28 | 深圳市时代华影科技股份有限公司 | Screen vibration system and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022062892A1 (en) | 2022-03-31 |
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