Speckle suppressing device and laser television

Abstract

The embodiment of the present disclosure provides a speckle suppression device and a laser television. The speckle suppression device comprises a diffractive optical module, a vibrating module and a fixing component. The diffractive optical module comprises a panel and at least one protrusion, and the at least one protrusion is distributed on the light-out side of the panel. The vibrating module comprises a vibrating component and the fixing component connected with the vibrating component. The fixing component is used for fixedly connecting the diffractive optical module and the vibrating module. The vibrating component drives the diffractive optical module to vibrate through the fixing component. The light-out side is not perpendicular to the vibrating direction of the diffractive optical module.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of optical display technology, in particular to a speckle suppression device and a laser television. BACKGROUND

[0002] Laser television (LASER TV) is a display technology that uses laser light source as display light source and cooperates with front projection display technology to form images, which has the advantages of high color gamut, high brightness, long service life, etc. However, laser television has the problem of speckle, that is, when the laser with high coherence irradiates the rough surface, the interference between the scattered beams produces granular and irregular light intensity distribution. The existence of laser speckle seriously affects the quality of the projection picture of laser television. SUMMARY

[0003] The embodiments of the present disclosure provide a speckle suppression device and a laser television to reduce the influence of laser speckle on the quality of the projection picture of laser television.

[0004] According to an aspect of the embodiments of the present disclosure, a speckle suppression device is provided, comprising: a diffractive optical module comprising a panel and at least one protrusion, the at least one protrusion being distributed on the light-out side of the panel; a vibration module comprising a vibration component and a fixing component connected with the vibration component, the fixing component being used to fixedly connect the diffractive optical module with the vibration module, the vibration component driving the diffractive optical module to vibrate through the fixing component; wherein the light-out side is not perpendicular to the vibration direction of the diffractive optical module.

[0005] In some embodiments, the vibration component comprises a vibration motor and a shell, the upper surface of the shell is parallel to the lower surface, and a circular hole is formed in the upper surface; the fixing component is in the form of a circular tube with an outer diameter smaller than the diameter of the circular hole, the cross section of the fixing component perpendicular to the central axis is in the form of a circular ring, one of the cross sections is located in the shell, the other of the cross sections is located above the shell and parallel to the upper surface, at least two clamping grooves are formed in the end of the other cross section, and the diffractive optical module is fixedly inserted into the at least two clamping grooves.

[0006] In some embodiments, the at least one protrusion is a plurality of protrusions, and the plurality of protrusions are distributed in an array on the light-out side.

[0007] In some embodiments, the at least one protrusion is a plurality of protrusions, and the size of any two protrusions is the same.

[0008] In some embodiments, the light-out side is parallel to the vibration direction of the diffractive optical module.

[0009] In some embodiments, the plurality of protrusions are distributed in a matrix on the light-out side.

[0010] In some embodiments, at least one of the row direction and the column direction of the plurality of protrusions distributed in a matrix form intersects with the vibration direction of the diffractive optical module.

[0011] In some embodiments, the fixing component is bonded to the diffractive optical module by ultraviolet glue.

[0012] In some embodiments, the plane in which the light-out side surface is located is perpendicular to the upper surface of the shell.

[0013] According to another aspect of the embodiments of the present disclosure, there is provided a laser television comprising the speckle suppression device of any of the above embodiments.

[0014] By using the speckle suppression device or the laser television of the above embodiments of the present disclosure, the diffractive optical module is fixedly connected to the vibration module, and the vibration component drives the diffractive optical module to vibrate through the fixing component, which can quickly improve the phenomenon of granular and irregular light intensity distribution caused by the interference between laser beams, and further reduce the influence of laser speckle on the projection picture quality of the laser television.

[0015] Of course, the products or methods implementing any of the embodiments of the present disclosure do not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the description of the embodiments of the present disclosure or the related art are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 Fig. 1 is a perspective view of a speckle suppression device according to some embodiments of the present disclosure;

[0018] Figure 2 Fig. 2 is a perspective view of a diffractive optical module according to some embodiments of the present disclosure;

[0019] Figure 3 Fig. 3 is a schematic diagram of the working principle of a speckle suppression device according to some embodiments of the present disclosure;

[0020] Figure 4 Fig. 4 is a schematic diagram of the structure of a laser television according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0021] With reference to the drawings of the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present disclosure.

[0022] To reduce the influence of laser speckle on the projection picture quality of laser television, the present disclosure provides a speckle suppression device and laser television.

[0023] Figure 1 A perspective view of the speckle suppression device of some embodiments of the present disclosure.

[0024] As shown in Figure 1 , the speckle suppression device for laser television in the present disclosure comprises:

[0025] a diffractive optical module 1 comprising a panel 11 and at least one protrusion 12 distributed on the light-out side of the panel 11;

[0026] a vibration module 2 comprising a vibration component 21 and a fixed component 22 connected with the vibration component 21, the fixed component 22 being used to fixedly connect the diffractive optical module 1 with the vibration module 2, and the vibration component 21 driving the diffractive optical module 1 to vibrate through the fixed component 22;

[0027] wherein the light-out side is not perpendicular to the vibration direction of the diffractive optical module 1.

[0028] By using the speckle suppression device of the present disclosure, the diffractive optical module is fixedly connected with the vibration module, and the vibration component drives the diffractive optical module to vibrate through the fixed component, which can quickly improve the phenomenon of granular irregular light intensity distribution caused by the interference between laser beams, and further reduce the influence of laser speckle on the projection picture quality of laser television.

[0029] In some embodiments, as Figure 1As shown, the vibrating component 21 comprises a vibrating motor (not shown in the figure) and a housing 210. The upper surface of the housing 210 is parallel to the lower surface, and the upper surface is provided with a circular hole. The fixing component 22 is in the shape of a circular tube with an outer diameter smaller than the diameter of the circular hole. The cross section of the fixing component 22 perpendicular to the central axis, i.e. the cross section of the two end faces perpendicular to the central axis of the circular tube, is in the shape of a circular ring. One of the cross sections is located inside the housing 210 and connected to the vibrating motor, so that the vibrating motor can drive the fixing component 22 to vibrate. The other cross section is located above the housing 210 and parallel to the upper surface of the housing 210. At least two clamping grooves (not shown in the figure) are provided at the end where the other cross section is located. The diffractive optical module 1 is clamped and fixed to the at least two clamping grooves, so that the diffractive optical module 1 is fixedly connected to the vibrating module 2.

[0030] In the above embodiment, by using the fixed connection mode, the vibrating module 2 can more effectively control the vibration direction and vibration frequency of the diffractive optical module 1, and can quickly reach the speckle limit of the speckle suppression device at a lower vibration frequency, thereby efficiently reducing the coherence of the laser diffracted light beam and making the light intensity distribution of the laser television projection image more uniform.

[0031] In some embodiments, the fixing component 22 is bonded to the diffractive optical module 1 by ultraviolet glue. For example, ultraviolet glue is applied in the clamping grooves of the fixing component 22, and then the diffractive optical module 1 is bonded by ultraviolet light irradiation and curing. In this way, the connection between the diffractive optical module 1 and the vibrating module 2 can be further strengthened by the bonding of the ultraviolet glue, which can more effectively ensure the effective vibration of the diffractive optical module 1.

[0032] In some embodiments, the at least one protrusion 12 is a plurality of protrusions, and the plurality of protrusions are arranged in an array on the light emitting side of the panel 11. Here, the light emitting side can be understood as the side from which the laser light beam exits after passing through the panel 11.

[0033] In some embodiments, the at least one protrusion 12 is a plurality of protrusions, and any two protrusions 12 have the same size. Of course, the sizes of the plurality of protrusions 12 can be partially the same, or the sizes of any two protrusions 12 in the plurality of protrusions 12 can all be different.

[0034] In some embodiments, the light emitting side is parallel to the vibration direction of the diffractive optical module 1. For example, in the case where the plane where the light emitting side is located is perpendicular to the upper surface of the housing 210, the vibration direction of the vibrating module 2 can be perpendicular to the upper surface of the housing 210, and correspondingly, the vibration direction of the diffractive optical module 1 can be perpendicular to the upper surface of the housing 210, or can be parallel to the light emitting side.

[0035] Figure 2 A perspective view of the diffractive optical module according to some embodiments of the present disclosure.

[0036] In some embodiments, the plurality of protrusions 12 are arranged in a matrix on the light-out side. At least one of the row direction L1 and the column direction L2 of the plurality of protrusions 12 arranged in a matrix intersects the vibration direction of the diffractive optical module 1. For example, the panel 11 of the diffractive optical module 1 is located on the YZ plane, and both the row direction L1 and the column direction L2 of the plurality of protrusions 12 intersect the vibration direction of the diffractive optical module 1, as shown in Figure 2 When the diffractive optical module 1 vibrates along the Z-Z' direction, the plurality of protrusions 12 have vibration components in both the row direction L1 and the column direction L2, in other words, the plurality of protrusions 12 can vibrate in both the row direction L1 and the column direction L2, that is, the plurality of protrusions 12 play a role of spatial and temporal incoherent pattern superposition on the laser beam in the mutually orthogonal row direction L1 and column direction L2, thereby achieving a better laser speckle suppression effect.

[0037] Of course, according to the structural size of the diffractive optical module 1, the row direction L1 and the column direction L2 can be rotated by any angle in the YZ plane, and the vibration frequency of the diffractive optical module 1 can also be adaptively configured, so that the vibration is sufficient times within the resolution time of the human eye, and the speckle contrast is reduced below the resolution of the human eye.

[0038] It is worth noting that the arrangement of the plurality of protrusions 12 can be other array distribution modes, for example, other dot array arrangement distribution modes other than matrix distribution. Of course, the arrangement of the plurality of protrusions 12 can also be other distribution modes or random arrangement modes other than array. Here, it will not be illustrated one by one.

[0039] The working principle of the speckle suppression device of some embodiments of the present disclosure will be further explained in combination with Figure 3 .

[0040] Figure 3 The working principle of the speckle suppression device of some embodiments of the present disclosure will be further explained in combination with

[0041] As Figure 3 shown, a laser beam (the expression of the light wave is wherein, represents the phase, and A0 represents the amplitude) is incident on the diffractive optical module 1, as shown in part a) of the figure. The refractive index of the diffractive optical module 1 is n, and the refractive index of air is approximately 1. As shown in part b) of the figure, the thickness of the diffractive optical module 1 at position M is h0, the optical path is nh0+h, and the phase of the outgoing laser light wave is The thickness of the diffractive optical module 1 at position N is (h0+h), the optical path is n(h0+h), and the phase of the outgoing laser light wave is Therefore, the thicknesses of the diffraction optical module 1 at different positions are different, the optical paths are different, and correspondingly, the phases of the outgoing laser light waves are different. The outgoing laser light waves are integrated and superimposed to form a laser diffraction light beam with different diffraction angles (as shown in part c of the figure), which further reduces the coherence of the laser diffraction light beam, realizes spatial non-coherent pattern superposition, and thus suppresses speckle.

[0042] In addition, the vibration module 2 drives the diffraction optical module 1 to vibrate, and the vibration direction and vibration frequency of the diffraction optical module 1 can be controlled. By using the human eye's visual persistence characteristic, time non-coherent pattern superposition is further realized, and a better speckle suppression effect is achieved.

[0043] Figure 4 A structural schematic diagram of a laser television of some embodiments of the present disclosure.

[0044] According to another aspect of the present disclosure, a laser television is also provided, which includes the speckle suppression device 43 of any of the above embodiments. The laser television using the speckle suppression device has a projection picture with a relatively uniform light intensity distribution, and the display quality of the laser television can be improved.

[0045] In some embodiments, the laser television further includes a laser light source 41, a projection lens 44, a screen 45, a convex lens 42, and the like. The speckle suppression device 43 is located in the optical path between the laser light source 41 and the projection lens 44. For example, the laser light beam emitted by the laser light source 41 is vertically incident on the side of the panel 11 opposite to the light-emitting side, and the light emitted after passing through the panel 11 and the convex 12 is projected onto the projection lens 44.

[0046] It should be noted that, in this document, relational terms such as first and second and the like can merely be used to distinguish one entity or action from another, without necessarily requiring or implying any actual such relationship or order between or among the entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a... " does not exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0047] Each of the embodiments in the present specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0048] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure are included in the scope of protection of the present disclosure.

Claims

1. A speckle suppressing device for use in laser television, characterized by The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device.

2. The speckle-inhibiting device of claim 1, wherein The application relates to a speckle suppression device.

3. The speckle-inhibiting device of claim 1, wherein The application relates to a speckle suppression device.

4. The speckle-inhibiting device of claim 1, wherein The application relates to a speckle suppression device.

5. The speckle-inhibiting device according to any one of claims 1 to 4, characterized in that The application relates to a speckle suppression device.

6. A laser television, characterized by, The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. The application relates to a speckle suppression device. 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