CN216118247U - Drive circuit, scattering member, light source device, and projector - Google Patents

Abstract

The present disclosure relates to a driving circuit, a diffusion member, a light source device, and a projector. Wherein the driving circuit is applied to a dynamic diffusion assembly comprising an optical diffusion sheet, the driving circuit comprising: a detection element and a control module; the detection element is connected with the control module and used for detecting the movement of the optical diffusion sheet and sending a movement signal to the control module; and the control module is connected with the dynamic diffusion assembly and used for controlling the optical diffusion sheet to move according to the movement signal. The control module controls the movement of the optical diffusion sheet in a reverse direction according to the movement signal of the optical diffusion sheet detected by the detection element, and therefore, the control module and the detection element form a feedback loop, so that more movement modes can be generated, the pseudo-random vibration of the optical diffusion sheet is realized, and therefore, enough random phases can be provided under the condition of a smaller size of the optical diffusion sheet, and the effect of eliminating speckles better is achieved.

Description

Drive circuit, scattering member, light source device, and projector

Technical Field

The present disclosure relates to the field of laser projection technologies, and in particular, to a driving circuit, a scattering member, a light source device, and a projector.

Background

The laser projection display technology can reproduce rich and gorgeous colors of an objective world most truly and provide shocking expressive force, wherein speckle elimination is a relatively popular research subject in the laser projection technology, the principle of the laser projection display technology is mainly that coherence of laser in space and time is reduced, and a plurality of groups of diffusion sheets are arranged at different positions of a light path in the conventional laser speckle elimination device so as to achieve the effect of speckle elimination.

The diffusion sheet is divided into a static diffusion sheet and a Dynamic diffusion sheet (Dynamic Optical Diffuser), the existing Dynamic diffusion sheet is mostly in a rotary type diffusion wheel form, the principle is the superposition of a plurality of independent speckle patterns in unit time, and under the condition of a certain rotating speed, the random phase quantity of the diffusion sheet in unit time is increased, so that a better speckle eliminating effect can be obtained. The diffuser near the laser source is used to eliminate smaller spots and the smaller diffuser size is required, but for a rotary type diffuser wheel, the smaller diffuser size provides less random phase and poor speckle elimination. In addition, the size of the diffusion wheel needs to be increased by matching with a rotating wheel with a larger size, the practical application area is limited, the maximization of the diffusion sheet application area cannot be realized, and meanwhile, the transmission structure of the whole diffusion wheel is also huge. Therefore, for a rotating type diffusion wheel, a diffusion sheet of a corresponding size cannot provide a corresponding number of random phases, and the speckle reduction effect is greatly compromised.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the related art, the present disclosure provides a driving circuit, a diffusion member, a light source device, and a projector.

In a first aspect, the present disclosure provides a driving circuit applied to a dynamic diffusion component, where the dynamic diffusion component includes an optical diffusion sheet, and the driving circuit includes:

a detection element and a control module;

the detection element is connected with the control module and used for detecting the movement of the optical diffusion sheet and sending a movement signal to the control module;

and the control module is connected with the dynamic diffusion assembly and used for controlling the optical diffusion sheet to move according to the movement signal.

Optionally, the control module comprises a controller and a control circuit;

the controller is connected with the detection element and is used for generating a first control signal according to the motion signal;

the control circuit is respectively connected with the dynamic diffusion component and the controller and is used for performing digital-to-analog conversion and amplification processing on the first control signal to obtain a second control signal and controlling the optical diffusion sheet to move according to the second control signal.

Optionally, the control circuit comprises a digital-to-analog converter and an operational amplifier;

the digital-to-analog converter is connected with the controller and used for performing digital-to-analog conversion on the first control signal to obtain a first conversion signal;

the operational amplifier is respectively connected with the dynamic diffusion component and the digital-to-analog converter and is used for amplifying the first conversion signal to obtain a second control signal and controlling the optical diffusion sheet to move according to the second control signal.

Optionally, the controller includes a control chip and an analog-to-digital converter;

the analog-to-digital converter is connected with the detection element and used for performing analog-to-digital conversion on the motion signal to obtain a second conversion signal;

the control chip is respectively connected with the analog-to-digital converter and the control circuit and is used for generating the first control signal according to the second conversion signal.

Optionally, the driving circuit further comprises a filter disposed between the detection element and the analog-to-digital converter;

wherein the filter is configured to filter the motion signal;

and the analog-to-digital converter is used for performing analog-to-digital conversion on the motion signal obtained after filtering by the filter.

Optionally, the detection element comprises a first direction detection unit and a second direction detection unit;

the first direction detection unit is connected with the control module and used for detecting the movement of the optical diffusion sheet in a first direction and sending a first direction movement sub-signal to the control module;

the second direction detection unit is connected with the control module and used for detecting the movement of the optical diffusion sheet in a second direction and sending a second direction movement sub-signal to the control module;

the control module is used for controlling the movement of the optical diffusion sheet in the first direction and the second direction according to the first direction movement sub-signal and/or the second direction movement sub-signal.

In a second aspect, the present disclosure provides a diffuser comprising a dynamic diffusion component and the driving circuit provided according to the first aspect of the present disclosure.

Optionally, the dynamic diffusion assembly further comprises a fixed layer, a moving layer on which the optical diffusion sheet is mounted, and a driving part, wherein the detection element is disposed on the fixed layer;

wherein, the drive division includes circular telegram coil and driving magnet, driving magnet with one of circular telegram coil sets up on the removal layer, and the other sets up on the fixed bed, driving magnet with circular telegram coil sets up relatively, control module with circular telegram coil is connected.

In a third aspect, the present disclosure provides a light source device, including a laser, a beam reduction assembly, a light uniformizing assembly, and a scattering member disposed between the beam reduction assembly and the light uniformizing assembly, wherein the scattering member is the scattering member provided in the second aspect of the present disclosure.

In a fourth aspect, the present disclosure provides a projector including the light source device provided in the third aspect of the present disclosure.

In the above technical solution, the driving circuit applied to the dynamic diffusion component includes a detection element and a control module. Wherein the dynamic diffusion component comprises an optical diffusion sheet; the detection element is connected with the control module and used for detecting the movement of the optical diffusion sheet and sending a movement signal to the control module; and the control module is connected with the dynamic diffusion assembly and used for controlling the optical diffusion sheet to move according to the movement signal. The control module controls the movement of the optical diffusion sheet in a reverse direction according to the movement signal of the optical diffusion sheet detected by the detection element, and the control module and the detection element form a feedback loop, so that more movement modes can be generated, and the pseudo-random vibration of the optical diffusion sheet can be realized.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic structural diagram of a driving circuit provided in an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a dynamic diffusion assembly provided in an exemplary embodiment of the present disclosure;

FIG. 3 is an exploded view of a dynamic diffusion assembly provided by an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic illustration of a dynamic diffusion assembly movement pattern provided by an exemplary embodiment of the present disclosure;

FIG. 5 is a top view of a dynamic diffusion assembly provided by an exemplary embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of a section A-A of the dynamic diffusion assembly of FIG. 5 provided by an exemplary embodiment of the present disclosure;

FIG. 7 is a cross-sectional view of a section A-A of the dynamic diffusion assembly of FIG. 5 provided by another exemplary embodiment of the present disclosure;

FIG. 8 is a close-up view of a dynamic diffusion assembly provided by an exemplary embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a driving circuit provided in another exemplary embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a driving circuit provided in another exemplary embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a driving circuit provided in another exemplary embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of a driving circuit provided in another exemplary embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of a driving circuit provided in another exemplary embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of a light source device provided in an exemplary embodiment of the present disclosure;

fig. 15 is a schematic structural diagram of a light source device according to an exemplary embodiment of the present disclosure.

Description of the reference numerals

1-a fixed layer, 10-a base, 101-a mounting groove, 11-a flexible circuit board, 2-a moving layer, 20-a support, 201-a mounting hole, 202-a support, 203-an avoidance groove, 204-a card slot, 23-an optical diffusion sheet, 3-a driving part, 31-an electric coil, 32-a driving magnet, 321-a magnet monomer, 5-an elastic support, 6-a connecting sheet, 60-a U-shaped opening, 7-a detection element, 71-a first direction detection unit, 72-a second direction detection unit, 100-a controller, 110-a control chip, 120-an analog-to-digital converter, 200-a control circuit, 210-an analog-to-digital converter, 220-an operational amplifier, 400-a filter, 500-a laser, 600-beam shrinking component, 700-light homogenizing component, 800-scattering component, 900-collimation component, 1000-control module and 10000-drive circuit.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of directional terms such as "upper", "lower", "top", "bottom", "left" and "right" generally refer to those defined in the normal use of the optical diffuser sheet provided by the present disclosure, and in particular, with reference to the drawing directions shown in fig. 6 and 7, "inner" and "outer" refer to the inner and outer of the respective component profiles. Moreover, when the following description refers to the accompanying drawings, like reference numbers in different drawings identify the same or similar elements.

The present disclosure provides a driving circuit applied to a dynamic diffusion assembly, wherein the dynamic diffusion assembly comprises an optical diffusion sheet. As shown in fig. 1, the driving circuit 10000 includes a detection element 7 and a control module 1000.

The detecting element 7 is connected to the control module 1000, and is configured to detect a movement of the optical diffusion sheet 23 and send a movement signal to the control module 1000.

And the control module 1000 is connected with the dynamic diffusion assembly and is used for controlling the optical diffusion sheet 23 to move according to the movement signal.

In addition, the driving circuit further comprises a power supply (not shown), wherein the power supply is respectively connected with the control module 1000 and the detection element 7 for supplying power to the two.

In the above technical solution, the driving circuit applied to the dynamic diffusion component includes a detection element and a control module. Wherein the dynamic diffusion component comprises an optical diffusion sheet; the detection element is connected with the control module and used for detecting the movement of the optical diffusion sheet and sending a movement signal to the control module; and the control module is connected with the dynamic diffusion assembly and used for controlling the optical diffusion sheet to move according to the movement signal. The control module controls the movement of the optical diffusion sheet in a reverse direction according to the movement signal of the optical diffusion sheet detected by the detection element, and the control module and the detection element form a feedback loop, so that more movement modes can be generated, and the pseudo-random vibration of the optical diffusion sheet can be realized.

As shown in fig. 2 and 3, the dynamic diffusion unit includes a fixed layer 1, a movable layer 2 on which an optical diffusion sheet 23 is mounted, and a driving unit 3, and the detection element 7 is provided on the fixed layer 1. The driving part 3 may be any suitable structure for driving the moving layer 2 to move, such as a rack and pinion mechanism, a ball screw mechanism, a linear motor, etc. The control module 1000 is configured to control the driving portion 3 to drive the moving layer 2 to move relative to the fixed layer 1 according to the motion signal, so as to implement motion control of the optical diffusion sheet 23. For example, the control module 1000 may control the driving part 3 to drive the movable layer 2 to move relative to the fixed layer 1 along a first direction and a second direction respectively according to the motion signal, wherein the first direction and the second direction are both parallel to the optical diffusion sheet 23.

Here, it should be noted that the first direction and the second direction may be two directions forming any angle with each other in a plane in which the optical diffusion sheet is located, for example, the first direction and the second direction are perpendicular to each other as an example, which will be described in detail below. As shown in fig. 4, the first direction may be an X direction, the second direction may be a Y direction, and the moving layer 2 may move relative to the fixed layer 1 in both the first direction and the second direction.

The following is a detailed description of the specific structure of the above dynamic diffusion unit. Specifically, as shown in fig. 4 and 5, the fixed layer 1 and the movable layer 2 may be respectively configured as a square sheet structure, the driving portion 3 is disposed at an edge portion of the square sheet structure, and the extending directions of two adjacent edges of the square sheet structure are respectively the first direction and the second direction, so that the driving portion 3 is disposed along the corresponding moving direction, and interference and stop are not generated to the movement of the movable layer 2, and smoothness of the movement in two directions can be ensured.

In order to ensure the driving effect on the moving layer 2, the driving part 3 includes a plurality of groups disposed between the fixed layer 1 and the moving layer 2, and the plurality of groups of driving parts 3 are respectively disposed along each side of the square sheet structure, wherein the control module 1000 is configured to control the plurality of groups of driving parts for driving the moving layer 2 in the first direction to synchronously operate according to the motion signal, and control the plurality of groups of driving parts for driving the moving layer 2 in the second direction to synchronously operate. That is, in the present embodiment, four sets of driving portions 3 are provided and respectively disposed on each side of the square sheet structure, the control module 1000 controls the driving portions 3 on two opposite sides to synchronously operate, the multiple sets of driving portions for driving the moving layer 2 to move along the X direction simultaneously operate, the multiple sets of driving portions for driving the moving layer 2 to move along the Y direction simultaneously operate, the driving force for the moving layer 2 is increased, and the moving layer 2 moves more smoothly relative to the fixed layer 1.

The drive section 3 may be any suitable mechanism. The drive unit 3 includes an energizing coil 31 and a drive magnet 32, one of the drive magnet 32 and the energizing coil 31 is provided on the moving layer 2, the other is provided on the fixed layer 1, the drive magnet 32 is provided opposite to the energizing coil 31, and the control module 1000 is connected to the energizing coil 31.

In the present embodiment, as shown in fig. 3, the fixed layer 1 includes a base 10 and a Flexible Printed Circuit (FPC) 11 fixed to the base 10, an energizing coil 31 is fixed to the Flexible Printed Circuit 11, a driving magnet 32 is fixed to the moving layer 2, and the control module 1000 is connected to the energizing coil 31. Specifically, taking the arrangement shown in fig. 6 as an example, the current on the left side of the energized coil 31 is directed into the paper and the current on the right side is directed out of the paper, the direction of the lorentz force applied to the energized coil 31 is leftward according to the left-hand rule, the direction of the reaction force of the lorentz force applied to the driving magnet 32 is rightward due to the fixed layer 1 being fixed, the driving section 3 drives the moving layer 2 to move rightward in the X direction, and when the direction of the current in the energized coil 31 is changed, the direction of the movement is opposite, i.e., leftward in the X direction. Similarly, the driving principle in the Y direction is similar to that in the Y direction, and by controlling the direction and magnitude of the current in the energized coil 31, the moving layer 2 can be driven to move the optical diffusion sheet 23 in two dimensions. In addition, the driving mode of the electrified coil 31 and the driving magnet 32 is adopted, so that the arrangement is convenient, the arrangement form of the driving part 3 is simplified, and the control is relatively easier.

In this embodiment, the electrical coil 31 can be formed by winding the existing electrical connection wire on the flexible circuit board 11, and does not occupy the upward height of the whole dynamic diffusion assembly Z, and the electrical coil 31 is directly arranged in the flexible circuit board 11 to become a part of the flexible circuit board 11, so that the conventional coil assembling processes such as winding, welding, dispensing and fixing can be omitted. The movable layer 2 comprises a support 20, a clamping groove 204 for fixing the driving magnet 32 is formed in the bottom wall of the support 20, the driving magnet 32 can be fixed in the clamping groove 204 in a dispensing mode, the support 20 can be a plastic support, and the driving magnet 32 is nested in the support 20 and does not occupy more Z-direction space.

The driving magnet 32 can be a permanent magnet or an electromagnet, the arrangement of the permanent magnet is relatively simpler, an electric connection line is not needed, and particularly, under the condition that the driving magnet 32 needs to be embedded into the support 20, the disorder of the spatial layout of the electric connection line can be avoided.

Specifically, as shown in fig. 6, the driving magnet 32 may be a bipolar permanent magnet, and N and S poles of the bipolar permanent magnet are arranged in the corresponding moving direction; or as shown in fig. 7, the driving magnet 32 may be a multi-pole permanent magnet, and the N pole and S pole of the magnet single 321 in the multi-pole permanent magnet are arranged along the direction perpendicular to the moving plane (the plane where the optical diffusion sheet 23 is located), the plurality of magnet single 321 may be assembled together in a dispensing manner, when assembling, the magnetic pole directions of two adjacent magnet single 321 are opposite, and the assembling firmness is further ensured under the action of magnetic force, and the driving magnet 32 is designed as the multi-pole permanent magnet, so that the magnetic induction line density of the nearby magnetic field can be increased, and accordingly the lorentz force for driving the moving layer 2 to move can be increased, and the driving magnet is particularly suitable for a heavier optical diffusion sheet 23 or a structural member moving together with the optical diffusion sheet 23.

In addition, there are various methods of fixing the optical diffusion sheet 23 to the moving layer 2. In the present disclosure, as shown in fig. 3, the support 20 has a mounting hole 201 matching with the shape of the optical diffusion sheet 23, for example, the optical diffusion sheet 23 is circular, the mounting hole 201 is a circular through hole, a support portion 202 and a plurality of avoiding grooves 203 arranged at intervals are formed on the inner peripheral wall of the mounting hole 201, the optical diffusion sheet 23 is fixed on the support portion 202, the plurality of avoiding grooves 203 extend to the support portion 202, the bottom wall of the optical diffusion sheet 23 can be fixed on the support portion 202 by dispensing, the plurality of avoiding grooves 203 not only can facilitate the mounting and taking out of the optical diffusion sheet 23, but also can form a dispensing opening between the avoiding grooves 203 and the optical diffusion sheet 23, thereby facilitating the dispensing operation, and fixing the optical diffusion sheet 23 on the support 20.

Further, in the present disclosure, as shown in fig. 2, the fixed layer 1 and the moving layer 2 are arranged at an interval from top to bottom to ensure that the moving layer 2 can move freely relative to the fixed layer 1, and in order to achieve connection between the fixed layer and the moving layer in the height direction, as an exemplary embodiment of the present disclosure, as shown in fig. 8, the fixed layer 1 and the moving layer 2 are connected in the height direction by a plurality of elastic supporting members 5, specifically, the elastic supporting members 5 may be a wire spring, a thin wire, a metal spring plate, and the like, and both ends of the elastic supporting members are welded and fixed to the support 20 and the base 10, respectively.

For convenience of welding, as shown in fig. 8, the four corners of the fixed layer 1 and the movable layer 2 are respectively provided with a connecting sheet 6, a U-shaped opening 60 is formed on the connecting sheet 6, two ends of the elastic supporting member 5 are respectively welded and fixed at the U-shaped openings 60 of the fixed layer 1 and the movable layer 2, and two ends of the elastic supporting member 5 can be installed in the connecting sheet 6 through the U-shaped openings 60 and then fixed by soldering, so that the assembly is facilitated, and the welding process is simplified. In addition, since the assembly stability of the connecting piece 6 is directly related to the effective length of the welded elastic supporting members 5, since the connecting piece 60 can be insert-molded into the holder 10 to ensure the connection rigidity of each elastic supporting member 5 in both directions, the stability and the accuracy of the relative position of the connecting piece 60 can be ensured.

When the driving magnet 32 is a bipolar permanent magnet, the detecting element 7 may be a Tunnel magnetoresistive sensor (TMR), and when the driving magnet 32 is a multi-pole permanent magnet, the detecting element 7 may be a linear hall sensor, and in this case, the motion signal is a magnetic field angle. In this case, the motion signal may be the displacement of the moving layer 2.

Specifically, as shown in fig. 6 and 7, a mounting groove 110 is formed on the top wall of the base 10, the detection element 7 is located in the mounting groove 101 and fixed on the bottom wall of the flexible circuit board 11, and does not occupy the mounting space in the Z direction, and meanwhile, the detection element 7 is fixed right below the driving magnet 32, so that the accuracy of acquiring the position information of the driving magnet 32 can be ensured. More specifically, the detecting element 7 may be fixed on the bottom wall of the flexible circuit board 11 by using a Surface Mount Technology (Surface Mount Technology), and the detecting element 7 may be fixed after being directly mounted without opening a mounting hole on the flexible circuit board 11, which is simple and convenient to operate.

The specific structure of the above-described drive circuit will be described in detail below. As shown in fig. 9, the control module 1000 includes a controller 100 and a control circuit 200.

The controller 100 is connected with the detection element 7 and is used for generating a first control signal according to the movement signal of the optical diffusion sheet 23; and the control circuit 200 is respectively connected with the dynamic diffusion assembly and the controller 100, and is configured to perform digital-to-analog conversion and amplification on the first control signal to obtain a second control signal, and control the movement of the optical diffusion sheet 23 according to the second control signal.

Specifically, the controller 100 may randomly adjust the first control signal generated last time by the controller 100 according to the motion signal of the optical diffusion sheet 23 as long as the first control signal generated again is different from the first control signal generated last time. Thus, pseudo-random vibration of the optical diffusion sheet is achieved by random adjustment.

As shown in fig. 10, the controller 100 includes a control chip 110 and an analog-to-digital converter 120.

The analog-to-digital converter 120 is connected to the detection element 7, and is configured to perform analog-to-digital conversion on the motion signal detected by the detection element 7, and obtain a second conversion signal; the control chip 110 is connected to the analog-to-digital converter 120 and the control circuit 200, respectively, and configured to generate a first control signal according to the second conversion signal.

In addition, in order to further improve the speckle eliminating effect, as shown in fig. 11, a filter 400 (e.g., an RC filter) may be disposed between the detecting element 7 and the analog-to-digital converter 120 to filter out high-frequency interference, so as to improve the detection accuracy of the motion signal, and further to realize the precise control of the optical diffusion sheet 23, so as to further improve the speckle eliminating effect. Wherein, the filter 400 is used for filtering the motion signal detected by the detecting element 7; and an analog-to-digital converter 120, configured to perform analog-to-digital conversion on the motion signal obtained after the filtering by the filter 400.

As shown in fig. 12, the control circuit 200 may include a digital-to-analog converter 210 and an operational amplifier 220; the digital-to-analog converter 210 is connected to the controller 100, and configured to perform digital-to-analog conversion on a first control signal generated by the controller 100 and obtain a first conversion signal; and the operational amplifier 220 is respectively connected with the energizing coil 31 and the digital-to-analog converter 210 in the dynamic diffusion assembly, and is used for amplifying the first conversion signal to obtain a second control signal and controlling the optical diffusion sheet 23 to move according to the second control signal.

Preferably, in order to increase the integration of the driving circuit, the digital-to-analog converter 210 and the operational amplifier 220 may be integrated.

In addition, in order to further increase the integration level of the driving circuit, the controller 100, the control circuit 200 and the power supply may be integrated on a printed circuit board.

As shown in fig. 13, the detection element 7 includes a first direction detection unit 71 and a second direction detection unit 72.

The first direction detection unit 71 is connected to the control module 1000, and is configured to detect a movement of the optical diffusion sheet 23 in a first direction and send a first direction movement sub-signal to the control module 1000; a second direction detection unit 72 connected to the control module 1000, for detecting the movement of the optical diffusion sheet 23 in the second direction and sending a second direction movement sub-signal to the control module 1000; and a control module 1000 for controlling the movement of the optical diffusion sheet 23 in the first direction and the second direction according to the first direction movement sub-signal and/or the second direction movement sub-signal.

In one embodiment, the control module 1000 may operate the sub-signal according to a first direction to control the movement of the optical diffusion sheet 23 in the first direction, and operate the sub-signal according to a second direction to control the movement of the optical diffusion sheet 23 in the second direction.

In another embodiment, the control module 1000 may operate the sub-signal according to the second direction to control the movement of the optical diffusion sheet 23 in the first direction, and operate the sub-signal according to the first direction to control the movement of the optical diffusion sheet 23 in the second direction.

In yet another embodiment, the control module 1000 may control the movement of the optical diffusion sheet 23 in the first direction by moving the sub-signal according to the first direction and the second direction, and control the movement of the optical diffusion sheet 23 in the second direction by moving the sub-signal according to the first direction and the second direction.

The present disclosure also provides a scattering element, wherein the scattering element includes the above dynamic diffusion component and the above driving circuit provided by the present disclosure.

The present disclosure also provides a light source apparatus, as shown in fig. 14, the light source apparatus includes a laser 500, a beam reduction assembly 600, a light uniformization assembly 700, and a scattering element 800 disposed between the beam reduction assembly 600 and the light uniformization assembly 700, where the scattering element 800 is the scattering element provided in the present disclosure, the beam reduction assembly 600 may be a set of galileo-structured telescopes, the objective lens is a positive meniscus lens, and the secondary lens is a double-concave negative lens. The light uniformizing assembly 700 may employ a fly-eye lens or a light uniformizing bar. In addition, in the present disclosure, as shown in fig. 15, a collimating element 900 may be further disposed between the scattering element 800 and the light uniformizing assembly 700, and the collimating element 900 may be a sheet or a group of condensing lenses, and the light source device can make full use of different phase divergence angles at all positions on the optical diffusion sheet 23 to provide a better speckle reduction effect at the same size.

In addition, the present disclosure also provides a projector including the above light source device provided by the present disclosure.

The driving circuit can be applied to a galvanometer, a motor, protection of an audio coil, and the like, in addition to the light source device.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A driving circuit for a dynamic diffusion assembly comprising an optical diffuser (23), characterized in that it comprises:

a detection element (7) and a control module (1000);

the detection element (7) is connected with the control module (1000) and is used for detecting the movement of the optical diffusion sheet (23) and sending a movement signal to the control module (1000);

the control module (1000) is connected with the dynamic diffusion assembly and used for controlling the optical diffusion sheet (23) to move according to the movement signal.

2. The drive circuit according to claim 1, wherein the control module (1000) comprises a controller (100) and a control circuit (200);

wherein the controller (100) is connected with the detection element (7) and is used for generating a first control signal according to the motion signal;

the control circuit (200) is respectively connected with the dynamic diffusion assembly and the controller (100), and is used for performing digital-to-analog conversion and amplification processing on the first control signal to obtain a second control signal and controlling the optical diffusion sheet (23) to move according to the second control signal.

3. The drive circuit of claim 2, wherein the control circuit (200) comprises a digital-to-analog converter (210) and an operational amplifier (220);

the digital-to-analog converter (210) is connected with the controller (100) and is used for performing digital-to-analog conversion on the first control signal to obtain a first conversion signal;

the operational amplifier (220) is respectively connected with the dynamic diffusion component and the digital-to-analog converter (210), and is used for amplifying the first conversion signal to obtain a second control signal and controlling the optical diffusion sheet (23) to move according to the second control signal.

4. The driver circuit according to claim 2, wherein the controller (100) comprises a control chip (110) and an analog-to-digital converter (120);

the analog-to-digital converter (120) is connected with the detection element (7) and is used for performing analog-to-digital conversion on the motion signal and obtaining a second conversion signal;

the control chip (110) is respectively connected with the analog-to-digital converter (120) and the control circuit (200), and is configured to generate the first control signal according to the second conversion signal.

5. The drive circuit according to claim 4, further comprising a filter (400) arranged between the detection element (7) and the analog-to-digital converter (120);

wherein the filter (400) is configured to filter the motion signal;

the analog-to-digital converter (120) is used for performing analog-to-digital conversion on the motion signal obtained after the filtering of the filter (400).

6. The drive circuit according to any one of claims 1 to 5, wherein the detection element (7) comprises a first direction detection unit (71) and a second direction detection unit (72);

the first direction detection unit (71) is connected with the control module (1000) and is used for detecting the movement of the optical diffusion sheet (23) in a first direction and sending a first direction movement sub-signal to the control module (1000);

the second direction detection unit (72) is connected with the control module (1000) and is used for detecting the movement of the optical diffusion sheet (23) in a second direction and sending a second direction movement sub-signal to the control module (1000);

the control module (1000) is used for controlling the movement of the optical diffusion sheet (23) in the first direction and the second direction according to the first direction movement sub-signal and/or the second direction movement sub-signal.

7. A diffuser element comprising a dynamic diffuser element and a driver circuit according to any of claims 1-6.

8. A diffuser element as claimed in claim 7, characterized in that the dynamic diffusion assembly further comprises a fixed layer (1), a moving layer (2) on which the optical diffuser (23) is mounted, a drive (3), wherein the detection element (7) is arranged on the fixed layer (1);

wherein, drive portion (3) include circular telegram coil (31) and driving magnet (32), driving magnet (32) with one of circular telegram coil (31) sets up on moving layer (2), the other sets up on fixed layer (1), driving magnet (32) with circular telegram coil (31) relative setting, control module (1000) with circular telegram coil (31) are connected.

9. A light source device comprising a laser (500), a beam reduction assembly (600), a light unifying assembly (700), and a scattering member (800) disposed between the beam reduction assembly (600) and the light unifying assembly (700), characterized in that the scattering member (800) is according to claim 7 or 8.

10. A projector characterized by comprising the light source device according to claim 9.

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