CN111323933A

CN111323933A - Speckle eliminating device and method and projection display equipment

Info

Publication number: CN111323933A
Application number: CN201811534894.7A
Authority: CN
Inventors: 宋丽培; 王静茹; 郭汝海; 刘显荣; 田有良
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2020-06-23

Abstract

The embodiment of the application provides a speckle dispersing device, a method and a projection display device, wherein the speckle dispersing device comprises: the light-transmitting device comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits; the transparent conductive film can include a plurality of independent conductive sub-regions, different conductive sub-regions are connected to different control circuits, and any control circuit is used for applying a voltage signal to the corresponding conductive sub-region. Due to different voltage signals applied by different control circuits, different sub-thin film areas in the electro-deformable material thin film can generate different degrees of deformation, incident light irradiated to the corresponding sub-thin film areas through the light-transmitting conductive film is scattered to different degrees, and inhibition of laser speckles is achieved. The embodiment of the application solves the problems of mechanical part abrasion and vibration noise in the prior art, and meanwhile, the structure is simple, and the space is saved.

Description

Speckle eliminating device and method and projection display equipment

Technical Field

The application relates to the technical field of projection display, in particular to a speckle dispersing device and method and projection display equipment.

Background

As projection display devices are widely used, the display requirements of people for projection display devices are increasing. Currently, lasers are used as potential light sources for next-generation projection display devices. Because the laser is a high-coherence light source, a very serious scattering phenomenon can be generated in the display process to form laser speckles, so that the quality of laser display images is seriously influenced. Therefore, how to realize the suppression of the laser speckle is an urgent problem to be solved in the field of laser display.

At present, methods for eliminating laser speckle can be divided into two main categories in principle: the coherence of the laser light source is reduced, and the suppression of speckles is realized through the dynamic superposition of a plurality of independent and uncorrelated speckle images. The speckle suppression is realized by dynamically superposing a plurality of independent uncorrelated speckle images, which is a common mode in the market at present. In the prior art, a plurality of speckle images are generated through mechanical movement of a scattering body, so that suppression of laser speckle is realized through superposition of the plurality of speckle images. But the mechanical movement has the problems of mechanical part abrasion, vibration noise or complex structure and the like.

Disclosure of Invention

The embodiment of the application provides a speckle dispersing device and method and projection display equipment, and solves the problems of mechanical part abrasion, vibration noise or complex structure existing in mechanical motion in the prior art.

In a first aspect, the present application provides a plaque dissipation device, comprising: the light-transmitting light-emitting diode comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits;

wherein the light-transmitting conductive film comprises a plurality of independent conductive subregions; different conductive sub-regions are connected to different control circuits;

the random control circuit is used for applying a voltage signal to a conductive sub-region connected with the control circuit, so that a sub-film region corresponding to the conductive sub-region in the electro-deformable material film is deformed, and incident light irradiated to the sub-film region through the conductive sub-region is scattered;

wherein different control circuits apply different voltage signals to the conductive sub-regions connected to the control circuits.

In one possible implementation, the apparatus includes: the first light-transmitting conductive film is positioned on the first surface of the electro-deformation material film, and the second light-transmitting conductive film is positioned on the second surface of the electro-deformation material film;

wherein the first light-transmitting conductive film includes a plurality of independent first conductive sub-regions, and the second light-transmitting conductive film includes a plurality of independent second conductive sub-regions; the first conductive subregions correspond to the second conductive subregions one to one;

any first conductive sub-area and a second conductive sub-area corresponding to the first conductive sub-area are connected to the same control circuit;

the random control circuit is used for applying voltage signals to the first conductive sub-region and the second conductive sub-region which are connected with the control circuit, so that sub-film regions in the electro-deformable material film, corresponding to the first conductive sub-region and the second conductive sub-region, are deformed, and incident light irradiated to the sub-film regions through the first conductive sub-region is scattered.

In one possible implementation, any of the control circuits includes: the device comprises a power supply, a first electrode and a second electrode, wherein the first electrode and the second electrode are respectively connected with the power supply;

wherein the first electrode is located in a first conductive sub-region connected to the control circuit and the second electrode is located in a second conductive sub-region connected to the control circuit, the first and second electrodes being of different polarity;

the power supply is configured to apply a voltage signal to the first conductive sub-region and the second conductive sub-region via the first electrode and the second electrode.

In one possible implementation, the shape, size and/or distribution of each of the first conductive sub-regions is random;

correspondingly, the shape, size and/or distribution of the second conductive sub-region corresponding to any first conductive sub-region is the same as that of the first conductive sub-region.

In one possible implementation, the speckle dissipating apparatus further includes: the collimating unit is arranged opposite to the electro-deformation material film in the emergent light direction of the electro-deformation material film;

the collimation unit is used for convergence and collimation treatment.

In one possible implementation, the speckle dissipating apparatus further includes: the beam widening unit and the beam splitting unit are sequentially arranged between a laser light source generating the incident light and the electro-deformation material film, and the beam combining unit is arranged opposite to the collimation unit in the emergent light direction of the electro-deformation material film;

wherein the beam expanding unit is used for changing the beam diameter and the divergence angle of the incident light;

the beam splitting unit is used for splitting the light beam processed by the beam widening unit into at least two beams of light;

the beam combination unit is used for combining at least two beams of light incident to the beam combination unit into one beam of light.

In one possible implementation, the scattering agent includes: alumina or titania.

In one possible implementation, the thin film of electro-deformable material comprises: electroactive polymer EAP films.

In a second aspect, the present application provides a speckle reduction method, which is applied to a speckle reduction device, and the speckle reduction device includes: the light-transmitting light-emitting diode comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits;

the method comprises the following steps:

when any control circuit applies a voltage signal to a conductive sub-region connected with the control circuit, a sub-film region corresponding to the conductive sub-region in the electro-deformable material film is deformed, and incident light irradiated to the sub-film region through the conductive sub-region is scattered;

In one possible implementation, the plaque dissipation device includes: the first light-transmitting conductive film is positioned on the first surface of the electro-deformation material film, and the second light-transmitting conductive film is positioned on the second surface of the electro-deformation material film;

when any control circuit applies voltage signals to the first conductive sub-region and the second conductive sub-region which are connected with the control circuit, the sub-film regions corresponding to the first conductive sub-region and the second conductive sub-region in the electro-deformation material film are deformed, and incident light irradiated to the sub-film regions through the first conductive sub-region is scattered.

In one possible implementation manner, the collimating unit is arranged opposite to the electro-deformation material film in the emergent light direction of the electro-deformation material film;

the collimation unit is used for convergence and collimation treatment.

In a third aspect, the present application provides a projection display device, including: a laser light source and a speckle dissipating apparatus as described in any one of the above first aspects.

In the speckle dispersing device, the method and the projection display device provided by the embodiment of the application, the speckle dispersing device comprises: the light-transmitting device comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits; the light-transmitting conductive film can comprise a plurality of independent conductive subregions, different conductive subregions are connected to different control circuits, and any control circuit is used for applying voltage signals to the conductive subregions connected with the control circuits. Because the voltage signals that different control circuit applyed are different for different sub-film areas that correspond with different conductive sub-areas can produce the deformation of different degree in the electro-deformation material film, carry out the scattering of different degree to the incident light that shines in the sub-film area that corresponds through the printing opacity conducting film, thereby can produce a plurality of independent speckle fields in the emergent light direction of electro-deformation material film, so that further can be through the stack of a plurality of speckle fields, realized the suppression to the laser speckle. Therefore, compared with the mode of generating a plurality of speckle images through the mechanical movement of the scatterer in the prior art, the speckle dissipation device provided by the embodiment of the application solves the problems of mechanical part abrasion and vibration noise in the prior art due to the adoption of the electrostriction characteristic of the electrostriction material film, and is simple in structure and capable of saving space.

Drawings

FIG. 1 is a schematic structural view of a speckle dissipating apparatus according to an embodiment of the present disclosure;

FIG. 2A is a schematic structural view of a speckle dissipating apparatus according to another embodiment of the present disclosure;

fig. 2B is a schematic diagram of maximum deformation and minimum speckle contrast of a thin film of an electro-deformable material doped with a scattering agent according to an embodiment of the present disclosure;

fig. 2C is a schematic diagram of the number of independent conductive sub-regions and the minimum speckle contrast ratio provided in the embodiment of the present application;

fig. 3A is a first schematic structural diagram of a portion of a light-transmitting conductive film according to an embodiment of the present disclosure;

fig. 3B is a schematic structural diagram of a portion of a light-transmitting conductive film according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural view of a speckle dissipating apparatus according to another embodiment of the present disclosure;

FIG. 5 is a schematic structural view of a plaque dissipation device according to another embodiment of the present disclosure;

fig. 6A is a schematic structural diagram of a projection display device according to an embodiment of the present application;

fig. 6B is a schematic view of a fixing manner of the speckle dispersing device according to an embodiment of the present application.

Detailed Description

First, an application scenario and a part of vocabulary related to the embodiments of the present application will be described.

As the display requirements of projection display devices are increasing (e.g., high brightness, high saturation, and/or wide area display, etc.), lasers are used as potential light sources for next generation projection display devices. Because the laser is a high-coherence light source, a very serious scattering phenomenon can be generated in the display process to form laser speckles, so that the quality of laser display images is seriously influenced. Therefore, how to realize the suppression of the laser speckle is an urgent problem to be solved in the field of laser display.

According to the speckle dispersing device, the speckle dispersing method and the projection display equipment provided by the embodiment of the application, the speckle dispersing device can comprise: the light-transmitting device comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits; the light-transmitting conductive film can comprise a plurality of independent conductive subregions, different conductive subregions are connected to different control circuits, and any control circuit is used for applying voltage signals to the conductive subregions connected with the control circuits. Because the voltage signals that different control circuit applyed are different for different sub-film areas that correspond with different conductive sub-areas can produce the deformation of different degree in the electro-deformation material film, carry out the scattering of different degree to the incident light that shines in the sub-film area that corresponds through the printing opacity conducting film, thereby can produce a plurality of independent speckle fields in the emergent light direction of electro-deformation material film, so that further can be through the stack of a plurality of speckle fields, realized the suppression to the laser speckle.

The electro-deformable material involved in the embodiments of the present application may include, but is not limited to, electro-active polymer (EAP), and may also include other materials that have electro-deformation and are optically transparent. Correspondingly, the film of the electro-deformable material referred to in the embodiments of the present application may include, but is not limited to, an EAP film.

The doped scatterers referred to in the embodiments of the present application may include, but are not limited to: alumina (AL)₂O₃) Or titanium dioxide (TiO)₂). For example, the doped scattering agent may also be other particles having a scattering effect and having a particle size of between 100 nm and 100 μm, so that a good scattering effect and scattering angle can be achieved.

The thin film of the electro-deformable material doped with the scattering agent, which is referred to in the embodiments of the present application, has extremely high light transmittance and elongation (for example, the light transmittance is greater than 95% and the elongation is 300% -700% when the thickness is 2 mm).

In the following embodiments of the present application, the preparation method of the EAP film doped with a scattering agent is described as an example:

1. determining the doping concentration of a scattering agent (or scattering particles), and determining the dosage of the scattering agent according to the doping concentration;

2. the scattering agent (e.g. AL) to be dosed₂O₃) Mixing the preparation A (coagulant) mixed with the EAP film uniformly;

3. the scattering agent-mixed preparation agent A is poured into the preparation agent B (film host material, such as silicon rubber substance), and the elastic scattering agent-doped EAP film is obtained according to the film preparation method.

Optionally, the curing time and curing temperature can be adjusted according to the thickness of the electro-deformation material film doped with the scattering agent and the dosage of the scattering agent, so as to enhance the extensibility, light transmittance and strength of the electro-deformation material film doped with the scattering agent; for example, if the thickness of the thin film of electro-deformable material doped with scattering agent is thicker or the dosage of scattering agent is larger, the curing time and curing temperature are increased.

The scattering agent doped EAP film described in the embodiments of the present application can be prepared in other ways, which is not limited in the embodiments of the present application.

When the electrically deformable material film doped with the scattering agent in the embodiment of the present application includes other electrically deformable and light-transmitting material films except the EAP film, reference may be made to the above-mentioned apparatus method for the EAP film doped with the scattering agent, and details thereof are not described here.

The light-transmitting conductive film related in the embodiment of the application is used for applying voltage to part or all of sub-film areas in the electro-deformable material film doped with the scattering agent under the control of the control circuit, so that the corresponding sub-film areas in the electro-deformable material film doped with the scattering agent are deformed, incident laser irradiated to the corresponding sub-film areas through the light-transmitting conductive film is scattered, and a plurality of speckle fields are generated in the emergent light direction of the electro-deformable material film doped with the scattering agent.

The light-transmitting conductive film involved in the embodiments of the present application may include a plurality of independent conductive sub-regions (different conductive sub-regions are connected to different control circuits), so that when a voltage signal is applied to any conductive sub-region by a corresponding control circuit (i.e., a control circuit connected to the conductive sub-region), the deformation of a sub-film region corresponding to the conductive sub-region in the electro-deformable material film can be independently controlled.

It should be noted that different conductive sub-regions in the light-transmitting conductive film referred to in the embodiments of the present application are insulated from each other.

Illustratively, the light-transmitting conductive film referred to in the embodiments of the present application may include, but is not limited to: the light-transmitting film comprises a first light-transmitting conductive film positioned on the first surface of the electro-deformation material film and a second light-transmitting conductive film positioned on the second surface of the electro-deformation material film.

The first transparent conductive film and/or the second transparent conductive film related in the embodiment of the application are used for applying voltage to part or all of sub-film areas in the electro-deformable material film doped with the scattering agent under the control of the control circuit, so that the corresponding sub-film areas in the electro-deformable material film are deformed, incident laser irradiated to the corresponding sub-film areas through the first transparent conductive film is scattered, and a plurality of speckle fields are generated in the emergent light direction of the electro-deformable material film doped with the scattering agent.

The first transparent conductive film in the embodiment of the present application includes a plurality of independent first conductive sub-regions, and the second transparent conductive film includes a plurality of independent second conductive sub-regions (the first conductive sub-regions and the second conductive sub-regions are disposed in a one-to-one correspondence), so that when a voltage signal is applied to any first conductive sub-region and the second conductive sub-region corresponding to the first conductive sub-region, the deformation of the sub-film region corresponding to the first conductive sub-region and the second conductive sub-region in the electrically deformable material film doped with a scattering agent can be independently controlled.

For example, assuming that the first light-transmitting conductive film includes a first conductive sub-region 1, a first conductive sub-region 2, and a first conductive sub-region 3 which are independent of each other, the second light-transmitting conductive film includes a second conductive sub-region 1 ', a second conductive sub-region 2 ', and a second conductive sub-region 3 ' which are independent of each other, respectively; the position of the first conductive sub-region 1 in the first transparent conductive film corresponds to the position of the second conductive sub-region 1 ' in the second transparent conductive film, the position of the first conductive sub-region 2 in the first transparent conductive film corresponds to the position of the second conductive sub-region 2 ' in the second transparent conductive film, and the position of the first conductive sub-region 3 in the first transparent conductive film corresponds to the position of the second conductive sub-region 3 ' in the second transparent conductive film.

It should be noted that different first conductive sub-regions in the first transparent conductive film are insulated from each other, and/or different second conductive sub-regions in the second transparent conductive film are insulated from each other.

In the embodiment of the present application, any first conductive sub-region and a second conductive sub-region corresponding to the first conductive sub-region are connected to the same control circuit.

In this embodiment, any control circuit is configured to apply a voltage signal to the first conductive sub-region and the second conductive sub-region connected to the control circuit, so that a sub-film region in the electro-deformable material film, which corresponds to the first conductive sub-region and the second conductive sub-region, is deformed.

For example, the first and second conductive sub-regions 1 and 1 ' are connected to the corresponding control circuits 1, the first and second conductive sub-regions 2 and 2 ' are connected to the corresponding control circuits 2, and the first and second conductive sub-regions 3 and 3 ' are connected to the corresponding control circuits 3.

Illustratively, different voltage signals applied to the conductive subregions connected with the control circuits by different control circuits are different, so that deformation generated by the regions of the sub-films corresponding to different first conductive subregions (or the regions of the sub-films corresponding to different second conductive subregions) in the electro-deformable material film doped with the scattering agent is different, and incident light irradiated to the corresponding regions of the sub-films through the first light-transmitting conductive film is scattered to different degrees, so that a plurality of different dynamic speckle fields can be generated in the emergent light direction of the electro-deformable material film doped with the scattering agent, and the suppression effect on laser speckle is improved.

Illustratively, the voltage signal applied by any control circuit involved in the embodiments of the present application may be a periodically varying voltage signal or a non-periodically varying voltage signal (e.g., a pulsed random voltage signal with a frequency of 100Hz-1KHz, etc.).

In the embodiment of the present application, any control circuit related in the embodiment of the present application may include, but is not limited to: the device comprises a power supply, a first electrode and a second electrode, wherein the first electrode and the second electrode are respectively connected with the power supply; the first electrode is located in a first conductive sub-region connected with the control circuit, the second electrode is located in a second conductive sub-region connected with the control circuit, and the polarities of the first electrode and the second electrode are different, so that a power supply can apply voltage signals to the corresponding first conductive sub-region and the corresponding second conductive sub-region through the first electrode and the second electrode, and a voltage is formed between the first conductive sub-region and the second conductive sub-region, so that sub-film regions corresponding to the first conductive sub-region and the second conductive sub-region in the electro-deformation material film are deformed.

For example, taking the control circuit 1 as an example, the control circuit 1 may include: a power source 11 and a first electrode 12 and a second electrode 13 connected to the power source 11, respectively; wherein the first electrode 12 is located in the first conductive sub-region 1 connected to the control circuit 1, the second electrode 13 is located in the second conductive sub-region 1 'connected to the control circuit 1 (the polarity of the first electrode 12 is different from that of the second electrode 13), and when the power supply 11 applies a voltage signal to the first conductive sub-region 1 through the first electrode 12 and applies a voltage signal to the second conductive sub-region through the second electrode 13, a voltage is formed between the first conductive sub-region 1 and the second conductive sub-region 1'.

To avoid causing a fixed pattern of speckle images in the outgoing light direction due to the periodic structure, the shape, size and/or distribution of each first conductive subregion is illustratively random; correspondingly, the shape, size and/or distribution of the second conductive sub-region corresponding to any first conductive sub-region are the same as those of the first conductive sub-region, so that a plurality of dynamic speckle fields in a non-fixed mode can be generated in the emergent light direction of the electro-deformable material film doped with the scattering agent, and the speckle eliminating effect can be improved.

For example, the shape, size and/or distribution of the first conductive sub-regions 1 are random, and correspondingly, the shape, size and/or distribution of the second conductive sub-regions 1' corresponding to the first conductive sub-regions 1 are the same as the shape, size and/or distribution of the first conductive sub-regions 1.

Any of the light-transmitting conductive films (e.g., the first light-transmitting conductive film and/or the second light-transmitting conductive film, etc.) involved in the embodiments of the present application may be directly plated on the surface of the electrically deformable material film doped with the scattering agent by a Physical Vapor Deposition (PVD) method (e.g., vacuum evaporation, ion plating, sputter coating, etc.), or a Chemical Vapor Deposition (CVD) method, etc.; of course, any transparent conductive film may be disposed on the surface of the thin film of electro-deformable material doped with scattering agent by other methods, which is not limited in the embodiment of the present application.

For example, any light-transmitting conductive film (e.g., the first light-transmitting conductive film and/or the second light-transmitting conductive film, etc.) referred to in the embodiments of the present application may refer to the existing preparation method, specifically as follows:

taking a flexible light-transmitting conductive film of silver nanowires as an example, nanowires with a diameter of about 20nm can be dispersed in a precursor solution composed of a viscosity regulator and a surface tension regulator to prepare an aqueous coating solution; further, the coating liquid is coated by an automatic coating machine for a preset number of times (for example, 1 time), and then dried for a preset time (for example, 2 to 5 minutes) to form the light-transmitting conductive film.

It should be noted that the smaller the diameter of the nanowire, the better. Illustratively, when the diameter of the nanowire is 20nm and the viscosity of the coating liquid is 3.6mPa · s, the transmittance of the obtained light-transmitting conductive film in the visible light range can be 95% or more.

Of course, any light-transmitting conductive film (e.g., the first light-transmitting conductive film and/or the second light-transmitting conductive film, etc.) related in the embodiments of the present application may also be prepared in other ways, which is not limited in the embodiments of the present application.

The speckle contrast referred to in the embodiments of the present application refers to a measure of the magnitude of intensity fluctuation in a speckle image relative to the average intensity, and is used for evaluating a parameter of the image for resolving speckle. For example, if the speckle contrast is smaller, the better the speckle is dispersed, and the clearer the image is; if the speckle contrast is larger, the more poor the speckle is dissipated, and the more blurred the image is.

The clear aperture referred to in the embodiments of the present application refers to the diameter of the illumination area produced by the beam of light in the thin film of electro-deformable material.

The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a schematic structural diagram of a speckle dissipation device according to an embodiment of the present application. As shown in fig. 1, the speckle dispersing device provided by the present embodiment may include: the light-emitting device comprises an electro-deformation material film 1 doped with scattering agent, a light-transmitting conductive film 2 positioned on the surface of the electro-deformation material film 1 and a plurality of control circuits (not shown in figure 1).

Illustratively, the light-transmitting conductive film in the embodiments of the present application may include, but is not limited to: a light-transmitting conductive film on either side surface of the electro-deformable material film 1 (illustrated in fig. 1 by taking as an example a light-transmitting conductive film on the upper surface of the electro-deformable material film 1 facing the laser light source for generating incident light), or light-transmitting conductive films on both side surfaces of the electro-deformable material film 1, respectively.

Illustratively, the light-transmitting conductive film 2 related in the embodiment of the present application may include a plurality of independent conductive sub-regions (different conductive sub-regions are connected to different control circuits, and any control circuit is configured to apply a voltage signal to the conductive sub-region connected to the control circuit), so that when any conductive sub-region is applied with a voltage signal by a corresponding control circuit (i.e., the control circuit connected to the conductive sub-region), the deformation of the sub-film region corresponding to the conductive sub-region in the electro-deformable material film may be independently controlled, and incident light irradiated into the sub-film region through the conductive sub-region is independently scattered, so as to generate a plurality of speckle fields in an emergent light direction of the electro-deformable material film doped with a scattering agent.

Optionally, different control circuits apply different voltage signals to the conductive sub-regions connected to the control circuits, so that sub-film regions corresponding to different conductive sub-regions in the electro-deformable material film 1 can be deformed to different degrees, and incident light irradiated into the corresponding sub-film regions through the transparent conductive film is scattered to different degrees, so that a plurality of independent speckle fields can be generated in the emergent light direction of the electro-deformable material film 1.

For example, if the conductive sub-region 1 is connected to the corresponding control circuit 1, the conductive sub-region 2 is connected to the corresponding control circuit 2, and the conductive sub-region 3 is connected to the corresponding control circuit 3, the control circuit 1 is configured to apply a voltage signal 1 to the conductive sub-region 1, so that the sub-film region 1 corresponding to the conductive sub-region 1 in the electro-deformable material film is deformed; the control circuit 2 is used for applying a voltage signal 2 to the conductive electronic area 2 so as to enable the sub-film area 2 corresponding to the conductive sub-area in the electro-deformation material film to deform; the control circuit 3 is used for applying a voltage signal 3 to the conductive sub-region 3 to enable the sub-film region 3 corresponding to the conductive sub-region 3 in the electro-deformation material film to deform; the voltage signal 1, the voltage signal 2 and the voltage signal 3 are different from each other.

Illustratively, the voltage signal applied by any control circuit may be a periodic voltage signal or a non-periodic voltage signal (for example, a pulse random voltage signal with a frequency of 100Hz-1KHz, etc.), so that the sub-film regions corresponding to the conductive sub-regions in the electro-deformable material film 1 corresponding to the control circuit are deformed and/or restored to different degrees, and the vibration of the electro-deformable material film doped with the scattering agent is introduced, so that a plurality of different random dynamic speckle fields can be generated in the emergent light direction of the electro-deformable material film, thereby further improving the effect of suppressing the laser speckle.

In this embodiment, when the incident light irradiates the electro-deformable material film 1 through the transparent conductive film 2, and the at least two control circuits apply voltage signals to the corresponding conductive sub-regions respectively (the voltage signals applied by the different control circuits are different), so that the sub-film regions corresponding to the conductive sub-regions to which the voltage signals are applied in the electro-deformable material film 1 can deform in different degrees, and the incident light irradiating the corresponding sub-film regions through the transparent conductive film 2 is scattered in different degrees, so that a plurality of independent speckle fields can be generated in the emergent light direction of the electro-deformable material film 1, and further, the suppression of laser speckles can be realized by the superposition of the plurality of speckle fields.

The plaque-dissipating device provided by the present application may include: the light-transmitting electro-deformation material comprises an electro-deformation material film 1 doped with a scattering agent, a light-transmitting conductive film 2 positioned on the surface of the electro-deformation material film 1 and a plurality of control circuits; among them, the light-transmitting conductive film 2 may include a plurality of independent conductive sub-regions therein; different conductive sub-areas are connected to different control circuits, any control circuit being adapted to apply a voltage signal to the conductive sub-area connected to said control circuit. Because the voltage signal that different control circuit applyed is different for different sub-film areas that correspond with different conductive subareas can produce the deformation of different degree in the electro-deformation material film 1, carry out the scattering of different degree to the incident light that shines corresponding sub-film area through the printing opacity conductive film, thereby can produce a plurality of independent speckle fields in the emergent light direction of electro-deformation material film 1, so that further can be through the stack of a plurality of speckle fields, realize the suppression to the laser speckle. Therefore, compared with the mode that a plurality of speckle images are generated through the mechanical movement of a scattering body in the prior art, the speckle dispersing device provided by the embodiment of the application solves the problems of mechanical part abrasion and vibration noise in the prior art due to the adoption of the electrostriction characteristic of the electrostriction material film, and is simple in structure and capable of saving space. Furthermore, the speckle eliminating effect can be further improved by optimizing the number of the independent conductive subregions.

Fig. 2A is a schematic structural diagram of a speckle dissipation device according to another embodiment of the present application. On the basis of the above embodiments, the present embodiment describes realizable modes of the light-transmitting conductive film 2. As shown in fig. 2A, the speckle dispersing device provided by this embodiment may further include: a first light-transmitting conductive film 21 on the first surface of the electro-deformable material film 1, and a second light-transmitting conductive film 22 on the second surface of the electro-deformable material film 1.

Illustratively, the first surface may be a surface facing a laser light source for generating incident light in the electrically deformable material film 1 doped with a scattering agent, and the second surface may be a surface facing an outgoing light direction in the electrically deformable material film 1 doped with a scattering agent.

For example, the first transparent conductive film 21 may include a plurality of independent first conductive sub-regions, and the second transparent conductive film 22 may include a plurality of independent second conductive sub-regions (each first conductive sub-region is disposed in one-to-one correspondence with a corresponding second conductive sub-region), so that when a voltage signal is applied to any first conductive sub-region and the second conductive sub-region corresponding to the first conductive sub-region, the deformation of the sub-film region corresponding to the first conductive sub-region and the second conductive sub-region in the electrically deformable material film 1 doped with a scattering agent may be independently controlled, and the incident light irradiated into the sub-film region through the first conductive sub-region is independently scattered, so as to generate a plurality of speckle fields in the outgoing light direction of the electrically deformable material film doped with a scattering agent.

Illustratively, any first conductive sub-region and the corresponding second conductive sub-region of the first conductive sub-region are connected to the same control circuit.

Illustratively, any control circuit is configured to apply a voltage signal to the first conductive sub-region and the second conductive sub-region connected to the control circuit, so as to independently control the deformation of the sub-film regions corresponding to the first conductive sub-region and the second conductive sub-region in the electro-deformable material film 1, and independently scatter the incident light irradiated into the sub-film regions through the first conductive sub-region, thereby generating a plurality of speckle fields in the outgoing light direction of the electro-deformable material film doped with a scattering agent.

Optionally, different voltage signals applied to the first conductive sub-region and the second conductive sub-region connected to the control circuit by different control circuits are different, so that the sub-film regions corresponding to different first conductive sub-regions (or the sub-film regions corresponding to different second conductive sub-regions) in the electro-deformable material film 1 can generate different degrees of deformation, and incident light irradiated to the corresponding sub-film regions through the first light-transmitting conductive film is scattered to different degrees, so that a plurality of independent speckle fields can be generated in the emergent light direction of the electro-deformable material film 1.

For example, assuming that the first conductive sub-region 1 and the second conductive sub-region 1 ' are connected to the corresponding control circuit 1, the first conductive sub-region 2 and the second conductive sub-region 2 ' are connected to the corresponding control circuit 2, and the first conductive sub-region 3 and the second conductive sub-region 3 ' are connected to the corresponding control circuit 3, the control circuit 1 is configured to apply a voltage signal 1 to the first conductive sub-region 1 and the second conductive sub-region 1 ', so that the sub-film region 1 corresponding to the first conductive sub-region 1 and the second conductive sub-region 1 ' in the electro-deformable material film is deformed; the control circuit 2 is used for applying a voltage signal 2 to the first conductive sub-region 2 and the second conductive sub-region 2 'so that the sub-film region 2 corresponding to the first conductive sub-region 2 and the second conductive sub-region 2' in the electro-deformable material film is deformed; the control circuit 3 is used for applying a voltage signal 3 to the first conductive sub-region 3 and the second conductive sub-region 3 'so that the sub-film region 3 corresponding to the first conductive sub-region 3 and the second conductive sub-region 3' in the electro-deformable material film is deformed; the voltage signal 1, the voltage signal 2 and the voltage signal 3 are different from each other.

Illustratively, the voltage signal applied by any control circuit may be a periodic voltage signal or a non-periodically varying voltage signal (for example, a pulse random voltage signal with a frequency of 100Hz-1KHz, etc.), so that sub-film regions corresponding to the first conductive sub-region and the second conductive sub-region in the electro-deformable material film 1 corresponding to the control circuit are deformed and/or restored to different degrees, and vibration of the electro-deformable material film doped with a scattering agent is introduced, so that a plurality of different random dynamic speckle fields can be generated in an emergent light direction of the electro-deformable material film, thereby further improving a suppression effect on laser speckle.

In this embodiment, when the incident laser beam is emitted to the electro-deformable material film 1 through the first transparent conductive film 21, and the at least two control circuits apply voltage signals to the corresponding first conductive sub-regions and the second conductive sub-regions respectively (the voltage signals applied by the different control circuits are different), so that the sub-film regions corresponding to the first conductive sub-regions and the second conductive sub-regions to which the voltage signals are applied in the electro-deformable material film 1 are deformed to different degrees, and the incident light irradiated to the corresponding sub-film regions through the first transparent conductive film 21 is scattered to different degrees, so that a plurality of independent speckle fields can be generated in the emergent light direction of the electro-deformable material film 1, and the suppression of laser speckles can be further realized by the superposition of the plurality of speckle fields.

The following embodiments of the present application describe the influence of the amount of deformation, the number of independent conductive sub-regions, and the size of the independent conductive sub-regions of the electro-deformable material film doped with the scattering agent on the speckle effect.

Fig. 2B is a schematic diagram of maximum deformation and minimum speckle contrast of a thin film of an electro-deformable material doped with a scattering agent according to an embodiment of the present disclosure. As shown in fig. 2B, assuming the same deformation time, the minimum speckle contrast decreases with the increase of the maximum deformation amount of the electrostrictive material film, i.e., the larger the maximum deformation amount of the electrostrictive material film, the better the condition of the dissipated speckle, and the clearer the image.

Fig. 2C is a schematic diagram of the number of independent conductive subregions and the minimum speckle contrast ratio provided in the embodiment of the present application. Optionally, the number of the independent conductive sub-regions may be the number of the first conductive sub-regions or the number of the second conductive sub-regions. As shown in fig. 2C, assuming that the maximum deformation of all the independent conductive sub-regions is 1mm, the minimum speckle contrast decreases with the increase of the number of the independent conductive sub-regions, that is, the number of the independent conductive sub-regions is increased, so that the speckle elimination effect can be enhanced.

It is assumed that the size of the independent conductive sub-region (alternatively, the independent conductive sub-region may be the first conductive sub-region or the second conductive sub-region) has little effect on the minimum speckle-reduction contrast ratio without changing the clear aperture.

The plaque-dissipating device provided by the present application may include: a scattering agent-doped electro-deformable material film 1, a first light-transmitting conductive film 21 and a second light-transmitting conductive film 22 respectively located on both surfaces of the electro-deformable material film 1, and a plurality of control circuits; the first transparent conductive film 21 may include a plurality of independent first conductive sub-regions, the second transparent conductive film 22 may include a plurality of independent second conductive sub-regions, and the first conductive sub-regions and the second conductive sub-regions are in one-to-one correspondence. Any first conductive sub-region and a corresponding second conductive sub-region of the first conductive sub-region are connected to the same control circuit, and the control circuit is used for applying voltage signals to the corresponding first conductive sub-region and second conductive sub-region. Because the voltage signals that different control circuit applyed are different, make in the electro-deformation material film 1 with different first conductive subregion and the sub-film region of the difference that the second conductive subregion corresponds can produce the deformation of different degree, carry out the scattering of different degree to the incident light that shines in the sub-film region that corresponds through first printing opacity conductive film, thereby emergent light direction at electro-deformation material film 1 can produce a plurality of independent speckle fields, so that further can be through the stack of a plurality of speckle fields, realize the suppression to the laser speckle.

On the basis of the above embodiments, in order to avoid causing a fixed-pattern speckle image in the outgoing light direction due to a periodic structure, the speckle elimination device provided in the embodiment of the present application is exemplarily configured such that the shape, size, and/or distribution of each first conductive subregion is random; correspondingly, the shape, size and/or distribution of the second conductive sub-region corresponding to any first conductive sub-region are the same as those of the first conductive sub-region, so that a plurality of non-fixed mode dynamic speckle fields can be generated in the emergent light direction of the electro-deformable material film 1, and the speckle eliminating effect can be further improved.

Fig. 3A is a schematic partial structural view of a transparent conductive film according to an embodiment of the present disclosure. As shown in fig. 3A, the shape, size and/or distribution of each conductive sub-region in the transparent conductive film (e.g., the first transparent conductive film or the second transparent conductive film) in the present embodiment is random.

Fig. 3B is a schematic structural diagram of a portion of the light-transmitting conductive film according to the embodiment of the present application. As shown in fig. 3B, each of the conductive sub-regions in the light-transmitting conductive film (e.g., the first light-transmitting conductive film or the second light-transmitting conductive film) in the embodiment may be hexagonal in shape and have the same size.

Of course, the shape, size and/or distribution of each conductive sub-region in any of the light-transmitting conductive films mentioned in the embodiments of the present application may also be other ways, which is not limited in the embodiments of the present application.

On the basis of the above embodiments, the present application describes an implementation manner of the above control circuit.

Any control circuit in the embodiments of the present application may include, but is not limited to: the power supply and the first electrode and the second electrode are respectively connected with the power supply, wherein the first electrode is located in a first conductive subarea connected with the control circuit, the second electrode is located in a second conductive subarea connected with the control circuit, and the polarities of the first electrode and the second electrode are different, so that the power supply applies voltage signals to the corresponding first conductive subarea and the second conductive subarea through the first electrode and the second electrode, and voltage is formed between the first conductive subarea and the second conductive subarea, so that sub-film areas corresponding to the first conductive subarea and the second conductive subarea in the electro-deformation material film are deformed.

Illustratively, the first electrode corresponding to any first conductive sub-region may be disposed along an edge of the first conductive sub-region; and/or the second electrode corresponding to any second conductive subarea can be arranged along the edge of the second conductive subarea. Therefore, if the shape and size of each conductive sub-region (e.g., the first conductive sub-region or the second conductive sub-region) are the same, it may be convenient to provide the corresponding electrode.

Of course, the first electrode and/or the second electrode may also be disposed in other ways, which is not limited in the embodiments of the present application.

Of course, the control circuit may also be implemented in other ways, which is not limited in the embodiment of the present application.

In the embodiment of the present application, each control circuit may include: the power supply can apply voltage signals to the corresponding first conductive subarea and the second conductive subarea through the first electrode and the second electrode, so that voltage is formed between the first conductive subarea and the second conductive subarea, and the sub-film areas corresponding to the first conductive subarea and the second conductive subarea in the electro-deformation material film are deformed. Because the voltage signal that different control circuit applyed is different for different sub-film areas can produce the deformation of different degree in the electro-deformation material film, carry out the scattering of different degrees to the incident light that shines in the sub-film area that corresponds through first printing opacity conductive film, thereby can produce a plurality of independent speckle fields in the emergent light direction of electro-deformation material film, so that further can realize the suppression to the laser speckle through the stack of a plurality of speckle fields.

In consideration of the fact that the emergent light of the electro-deformable material film doped with the scattering agent is comparatively divergent, fig. 4 is a schematic structural diagram of a speckle elimination device provided by another embodiment of the present application, as shown in fig. 4, on the basis of the above embodiments, the speckle elimination device provided by the present embodiment may further include: a collimating unit 3 disposed opposite to the electro-deformable material film 1 in an emergent light direction of the electro-deformable material film 1; the collimating unit 3 is configured to converge and collimate the speckle fields in the emergent light direction of the electrostrictive material film 1, so as to enter an imaging unit in the projection display device for display.

Exemplarily, the collimating unit 3 may include, but is not limited to: at least one collimating lens. For example, if the number of the conductive sub-regions in the transparent conductive film (for example, the number of the first conductive sub-regions in the first transparent conductive film and/or the number of the second conductive sub-regions in the second transparent conductive film) is large, the collimating unit 3 may include a large number of collimating lenses, so that each collimating lens can converge and collimate the emergent light corresponding to the small number of conductive sub-regions.

In general, the damage of light to a substance is mainly caused by the heat damage caused by the absorption of photon energy into heat by the substance. Since the light transmittance of the film of the electro-deformable material is good (e.g. > 95% transmittance of a film of the electro-deformable material with a thickness of 2 mm), the absorption of photon energy is less. Moreover, in practical applications, it is common to use only a few hundred microns thick film of the electrostrictive material, and thus almost completely transparent, with the surface of the electrostrictive material film being able to withstand 120 degrees. The electro-deformable material film is not damaged by impinging light at a lower power (e.g., 2W), but may be damaged by impinging light at a higher power (e.g., 60W).

Considering that the incident laser has a large power and may damage the thin film of the electro-deformable material doped with the scattering agent, fig. 5 is a schematic structural diagram of a speckle elimination apparatus provided in another embodiment of the present application, as shown in fig. 5, based on the above embodiments, the speckle elimination apparatus provided in this embodiment may further include: a beam widening unit 4 and a beam splitting unit 5 which are sequentially arranged between a laser light source generating incident light and the electro-deformable material film 1, and a beam combining unit 6 which is arranged opposite to the collimating unit 3 in the emergent light direction of the electro-deformable material film 1.

Illustratively, the beam expanding unit 4 is used to change the beam diameter and the divergence angle of the incident light, so that the power irradiated onto a unit area in the electro-deformable material film doped with the scattering agent can be reduced, and the protection of the electro-deformable material film doped with the scattering agent is realized.

Illustratively, the beam splitting unit 5 is configured to split the light beam processed by the beam expanding unit 4 into at least two beams of light, so that different light beams can be irradiated to different sub-film regions in the electrically deformable material film doped with the scattering agent, thereby not only reducing power irradiated to a unit area in the electrically deformable material film doped with the scattering agent and realizing protection of the electrically deformable material film doped with the scattering agent, but also reasonably using the electrically deformable material film doped with the scattering agent and improving utilization rate of the electrically deformable material film doped with the scattering agent.

Specifically, the number of beams into which the beam processed by the beam expanding unit 4 is split by the beam splitting unit 5 is determined according to parameters such as the power of the incident light, the beam diameter of the incident light, and the optical power requirement of the light incident on the electro-deformable material film. For example, taking the incident light power of 30W, the incident light beam diameter of 2mm, and the shape of the sub-film region as a circle, if the incident light power on the electrically-deformable material film doped with the scattering agent is guaranteed to be 2W, the clear aperture diameter of the electrically-deformable material film needs to be greater than or equal to 8mm, at this time, the incident light is expanded from 2mm to 8mm in diameter by expanding the incident light through the beam expanding unit 4, and then the light beam is divided into 7 beams by the beam splitting unit 5, each beam may have a diameter of 3mm, and the number of independent control sub-regions (i.e., sub-film regions) of the electrically-deformable material film is also 7, so that the light power irradiated on the electrically-deformable material film can be reduced to 2W.

Illustratively, the beam combining unit 6 is configured to combine at least two beams of light (i.e., the beams of light transmitted through the collimating unit 3 along the emergent light direction of the electro-deformable material film) incident to the beam combining unit 6 into one beam of light, so as to subsequently enter an imaging unit in the projection display device for displaying.

Illustratively, the beam combining unit 6 may include, but is not limited to: a first lens group and a second lens group; the first lens group is used for converging at least two beams of light incident to the first lens group, and the second lens group is used for collimating the light beams converged by the first lens group so as to synthesize a beam of light.

An embodiment of the present application further provides a method for dissipating a spot, where the method is applied to a spot dissipation device provided in any of the above embodiments of the present application, and the spot dissipation device includes: the light-transmitting light-emitting diode comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits;

the method comprises the following steps:

the first electrode is positioned in a first conductive subarea connected with the control circuit, the second electrode is positioned in a second conductive subarea connected with the control circuit, and the polarities of the first electrode and the second electrode are different;

the power supply is used for applying voltage signals to the first conductive sub-region and the second conductive sub-region through the first electrode and the second electrode.

In one possible implementation, the shape, size and/or distribution of each first conductive sub-region is random;

the collimation unit is used for convergence and collimation treatment.

In one possible implementation, the speckle dissipating apparatus further includes: the beam widening unit and the beam splitting unit are sequentially arranged between a laser light source generating incident light and the electro-deformation material film, and the beam combining unit is arranged opposite to the collimation unit in the emergent light direction of the electro-deformation material film;

the beam widening unit is used for changing the beam diameter and the divergence angle of incident light;

In one possible implementation, the film of electro-deformable material comprises: electroactive polymer EAP films.

The speckle eliminating method provided by the embodiment of the application can be applied to the technical scheme in the embodiment of the speckle eliminating device, the implementation principle and the technical effect are similar, and details are not repeated here.

Fig. 6A is a schematic structural diagram of a projection display device according to an embodiment of the present application. As shown in fig. 6A, a projection display device 60 provided in an embodiment of the present application may include: a laser light source 601 and a speckle dissipating device 602. The speckle eliminating device 602 may adopt the structure in the above embodiments of the speckle eliminating device of the present application, and the implementation principle and technical effect are similar, which are not described herein again.

The following embodiments of the present application describe the manner in which speckle reduction device 602 is attached.

Fig. 6B is a schematic view of a fixing manner of the speckle dispersing device according to an embodiment of the present application. As shown in fig. 6B, plaque dissipating device 602 may be secured by a mount 603. For example, plaque dissipating device 602 may be secured by a self-tightening clamp 604 provided on a mount 603. Of course, dissipater 602 may be secured in other ways, which are not limited in the embodiments of the present application.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

It will be appreciated that the relevant features of the devices described above may be referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should 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 or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A speckle-dissipating device, comprising: the light-transmitting light-emitting diode comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits;

2. The apparatus of claim 1, comprising: the first light-transmitting conductive film is positioned on the first surface of the electro-deformation material film, and the second light-transmitting conductive film is positioned on the second surface of the electro-deformation material film;

3. The apparatus of claim 2, wherein any of the control circuits comprises: the device comprises a power supply, a first electrode and a second electrode, wherein the first electrode and the second electrode are respectively connected with the power supply;

4. The apparatus of any of claims 1-3, further comprising: the collimating unit is arranged opposite to the electro-deformation material film in the emergent light direction of the electro-deformation material film;

the collimation unit is used for convergence and collimation treatment.

5. The apparatus of claim 4, further comprising: the beam widening unit and the beam splitting unit are sequentially arranged between a laser light source generating the incident light and the electro-deformation material film, and the beam combining unit is arranged opposite to the collimation unit in the emergent light direction of the electro-deformation material film;

6. The apparatus of any one of claims 1-3, wherein the scattering agent comprises: alumina or titania.

7. The device according to any one of claims 1-3, wherein the film of electro-deformable material comprises: electroactive polymer EAP films.

8. A method of speckle reduction, the method being applied to a speckle reduction device, the speckle reduction device comprising: the light-transmitting light-emitting diode comprises an electro-deformation material film doped with a scattering agent, a light-transmitting conductive film positioned on the surface of the electro-deformation material film and a plurality of control circuits;

the method comprises the following steps:

9. The method of claim 8, wherein the despeckle device comprises: the first light-transmitting conductive film is positioned on the first surface of the electro-deformation material film, and the second light-transmitting conductive film is positioned on the second surface of the electro-deformation material film;

10. A projection display device, comprising: a laser light source and the speckle dissipating apparatus of any one of claims 1-7.